Intelligent well lid system and intelligent well lid for energy recovery monitoring

Abstract

The present application relates to the technical field of intelligent monitoring, and especially relates to an intelligent well lid system for energy recovery monitoring and an intelligent well lid, wherein the present application is provided with a well lid assembly, an information monitoring assembly, a correlation building module, a signal analysis module and a communication regulation module, the well lid assembly comprises a well lid, a mounting frame and an energy recovery module, the information monitoring assembly is used to collect the magnetic field intensity emitted by the magnetic material coated on the edge of the well lid and to obtain the current intensity of the converted electric energy in the energy recovery module, the correlation building module is used to pre-build the corresponding correlation between the magnetic field intensity variation and the current intensity, the signal analysis module is used to determine the reset state category of the well lid, the communication regulation module is used to update the corresponding correlation of the correlation building module or to determine the regulation mode of the energy recovery module, and thus, the energy recovery mode is regulated according to the reset state category of the well lid, and the stability and reliability of the well lid energy recovery system are improved.

Description

Technical Field

[0001] This invention relates to the field of intelligent monitoring technology, and in particular to an intelligent manhole cover system and an intelligent manhole cover for energy recovery monitoring. Background Technology

[0002] With the continuous development of urban construction, manhole covers are playing an increasingly important role in urban infrastructure. Recycling and storing the vibrations generated by manhole covers has become a major research and development direction to achieve efficient resource utilization and energy conservation and emission reduction. However, existing technologies for monitoring the condition of energy-recovery manhole covers are relatively scarce. Currently, relying on regular manual inspections is inefficient and makes it difficult to comprehensively and timely grasp the actual condition of the manhole covers. Manhole covers generate electrical energy when they vibrate, and the stability of this electrical energy generation is closely related to the manhole cover's reset state. When the manhole cover is in a good reset state, the stability of the vibration can ensure that the energy recovery system is in a safe working state. Therefore, data monitoring during the energy recovery process helps to accurately determine the manhole cover's reset state and improve the overall safety level and management efficiency of urban infrastructure.

[0003] For example, Chinese Patent Publication No. CN115665589A discloses an ultra-low power IoT manhole cover monitoring device with potential energy recovery. In terms of reducing power consumption, it utilizes a low-leakage nano-ampere-level low-current circuit with an autonomous learning sleep strategy to reduce overall power consumption. While controlling power consumption, this invention also adds an energy recovery system that can charge the battery. The energy recovery system consists of an induction module, an energy storage module, and a battery storage module. The induction module, composed of an induction coil and related electronic circuitry, is typically buried under the manhole cover and connected to the energy storage module. When a vehicle passes over the manhole cover, the continuously generated weak induced current is collected by the energy storage module. Once a predetermined charge is reached, the current is discharged to the battery to recover electrical energy. The energy recovery system also adds a battery storage module between the battery and the electrical components. When the electrical components are in sleep mode, the battery stores electricity, which is then recovered through the energy storage module.

[0004] The following problems still exist in the existing technology:

[0005] Existing technologies do not consider the impact of the manhole cover's reset state on the stability and safety of energy recovery after the manhole cover is opened. Existing technologies cannot compare and analyze energy recovery data after the manhole cover is reset, nor can they adjust the energy recovery method according to the type of manhole cover reset state, thus affecting the stability and reliability of the energy recovery system. Summary of the Invention

[0006] To address this, the present invention provides an intelligent manhole cover system and an intelligent manhole cover for energy recovery monitoring, thereby overcoming the problems of existing technologies that cannot compare and analyze energy recovery data after the manhole cover is reset, and cannot adjust the energy recovery method according to the type of manhole cover reset state.

[0007] To achieve the above objectives, the present invention provides an intelligent manhole cover system for energy recovery monitoring, comprising:

[0008] A manhole cover assembly includes a manhole cover, a mounting frame encircling the edge of the manhole cover, and an energy recovery module buried under the manhole cover to convert and store the mechanical energy of vibrations to the manhole cover into electrical energy, wherein the edge of the manhole cover is coated with a magnetic material.

[0009] The information monitoring component includes an RFID chip embedded in the back of the manhole cover, a sensor set on the mounting frame to collect the magnetic field strength emitted by the magnetic material, and a current monitoring unit to obtain the current strength of the current converted into electrical energy in the energy recovery module.

[0010] The association construction module is connected to the information monitoring component to obtain in advance the change in magnetic field strength of the sensor and the current intensity of the current monitoring unit within a certain number of pre-collection periods, and to construct the corresponding association relationship between the change in magnetic field strength and the current intensity.

[0011] The signal analysis module, which is connected to the association construction module, is used to obtain the change in magnetic field strength of the sensor within several monitoring cycles during the manhole cover reset monitoring period, and to determine the reset status category of the manhole cover based on the numerical distribution of the current intensity corresponding to each change in magnetic field strength.

[0012] The communication control module is connected to the signal analysis module, the association construction module, and the manhole cover assembly, respectively. It is used to update the corresponding association relationship of the association construction module according to the reset state category of the manhole cover, or to determine the control mode of the energy recovery module according to the current intensity corresponding to the change in magnetic field strength.

[0013] Furthermore, the RFID chip on the back of the manhole cover stores the authorized personnel's identification code, operation time, and location information.

[0014] Furthermore, the correlation construction module is used to construct the corresponding correlation between the change in magnetic field strength and the current strength, wherein,

[0015] The association construction module determines the average current intensity of several current intensities corresponding to each change in magnetic field intensity as a current intensity reference value based on the change in magnetic field intensity of the sensor and the current intensity of the current monitoring unit within several pre-collection periods, and constructs a corresponding association relationship between each change in magnetic field intensity and the current intensity reference value.

[0016] Furthermore, the monitoring period for manhole cover reset is a preset time period after the manhole cover has completed its operation.

[0017] Furthermore, the signal analysis module is used to obtain the change in magnetic field strength of the sensor during several manhole cover reset monitoring periods, and to obtain several current intensities corresponding to the same change in magnetic field strength, thereby constructing a set of current intensity values ​​corresponding to each change in magnetic field strength.

[0018] Furthermore, the signal analysis module is used to determine the reset state category of the manhole cover, wherein,

[0019] The signal analysis module determines the reference values ​​of current intensity and the corresponding set of current intensity values ​​corresponding to the changes in magnetic field intensity.

[0020] If any change in magnetic field strength corresponds to a current intensity reference value that falls within the range of the current intensity value set corresponding to that change in magnetic field strength, then the signal analysis module determines the reset state category of the manhole cover as the stable reset state category.

[0021] If any change in magnetic field strength corresponds to a current intensity reference value that does not fall within the range of the current intensity value set corresponding to that change in magnetic field strength, then the signal analysis module determines that the reset state of the manhole cover is an unstable reset state.

[0022] Furthermore, the communication control module is used to obtain the reset state category of the manhole cover. If the reset state category of the manhole cover is the stable reset state category, the communication control module controls the association construction module to update the corresponding association relationship between the change in magnetic field strength and the current strength.

[0023] If the reset state category of the manhole cover is the unstable reset state category, the communication control module determines the control method of the energy recovery module based on the current intensity corresponding to each change in magnetic field strength.

[0024] Furthermore, the communication control module controls the correlation construction module to update the corresponding correlation between the change in magnetic field strength and the current intensity, wherein,

[0025] The communication control module acquires the set of current intensity values ​​corresponding to the change in magnetic field strength, calculates the average value of the current intensity values ​​in the set, and updates the reference value of the current intensity corresponding to the change in magnetic field strength based on the average value and the average value of the reference value of the current intensity corresponding to the change in magnetic field strength.

[0026] Furthermore, the communication control module determines the control method for the energy recovery module, including:

[0027] If the numerical distance between the current intensity of the change in magnetic field strength and the numerical set of the current intensity of the change in magnetic field strength is less than a preset numerical distance threshold, then the communication control module controls the energy recovery module to connect the capacitive protection branch.

[0028] If the numerical distance between the current intensity of the change in magnetic field strength and the numerical value set of the current intensity of the change in magnetic field strength is greater than or equal to a preset numerical distance threshold, the communication control module controls the internal circuit of the energy recovery module to disconnect and reads the RFID chip location information of the manhole cover to issue an alarm.

[0029] The present invention also provides an intelligent manhole cover based on multi-source information, comprising:

[0030] The manhole cover has its edges coated with magnetic material;

[0031] The mounting frame is circumferentially disposed around the edge of the manhole cover to support the manhole cover and is hinged to the manhole cover so that the manhole cover can be opened relative to the horizontal ground.

[0032] An RFID chip, embedded in the back of the manhole cover, is used to store the authorized personnel's identification code, work duration, and location information.

[0033] A sensor, mounted on the mounting frame, is used to collect the magnetic field strength emitted by the magnetic material;

[0034] An energy recovery module, buried under a manhole cover, includes a conversion unit for converting mechanical energy into electrical energy and an energy storage unit for storing electrical energy. The energy storage unit and the conversion unit are connected by a connection circuit, which includes a capacitive protection branch.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention sets up a manhole cover assembly, an information monitoring assembly, an association construction module, a signal analysis module, and a communication control module. The manhole cover assembly includes a manhole cover, an installation frame, and an energy recovery module. The information monitoring assembly collects the magnetic field strength emitted by the magnetic material coated on the edge of the manhole cover and obtains the current intensity of the converted electrical energy in the energy recovery module. The association construction module pre-builds a corresponding correlation between the change in magnetic field strength and the current intensity. The signal analysis module determines the reset state category of the manhole cover. The communication control module updates the corresponding correlation in the association construction module or determines the control method of the energy recovery module. Thus, it realizes the comparative analysis of energy recovery data after the manhole cover is reset, and the control method of energy recovery is adjusted according to the reset state category of the manhole cover, thereby improving the stability and reliability of the manhole cover energy recovery system.

[0036] Furthermore, by establishing a correspondence between changes in magnetic field strength and current intensity, this invention can provide a clear and reliable reference for judging the reset status of manhole covers. It can clearly present the correlation between changes in magnetic field strength and current intensity under normal conditions, and abnormal current intensity values ​​can be detected in a timely manner based on the pre-constructed relationship, thereby improving the representativeness of data extraction for manhole cover status analysis.

[0037] Furthermore, by comparing the reference value of the current intensity with the range of current intensity values, this invention can accurately determine whether the manhole cover reset state is stable, and can promptly identify manhole covers with unstable reset states, enabling the system to take countermeasures in advance to avoid affecting the normal operation of the energy recovery module due to poor manhole cover reset, thus ensuring the stable operation of the system. In addition, it enables comparative analysis of energy recovery data after manhole cover reset, and scientifically and reliably distinguishes the categories of manhole cover reset states.

[0038] Furthermore, by updating the corresponding correlation, this invention can more accurately grasp the relationship between the change in magnetic field strength and the current intensity. Thus, based on the actual change in magnetic field strength, it can more accurately determine the working status of the energy recovery module. It is understood that changes in the external environment of the manhole cover, such as changes in temperature, humidity, or changes in surrounding road conditions and traffic flow, may cause changes in the correlation between the change in magnetic field strength and the current intensity. When it is determined that the manhole cover reset state is stable, timely updating the corresponding correlation enables the system to better adapt to these environmental changes and ensure the accuracy and reliability of energy recovery monitoring.

[0039] Furthermore, this invention adopts different control methods according to the current fluctuation, realizing dynamic and precise control of the energy recovery module. Whether it is a small current fluctuation or a large anomaly, the system can make corresponding handling, so that the energy recovery module maintains a relatively stable operating state under complex working conditions. Through timely response and handling of current anomalies, the system can issue a signal before the fault worsens, reminding maintenance personnel to take timely measures for prevention and repair, reducing the probability of sudden equipment failure, and improving the stability and reliability of the manhole cover energy recovery system. Attached Figure Description

[0040] Figure 1 This is a system block diagram of a manhole cover system for energy recovery monitoring according to an embodiment of the present invention;

[0041] Figure 2 This is a flowchart illustrating the logic of the signal analysis module in this invention for determining the reset state category of the manhole cover.

[0042] Figure 3 The following is a flowchart illustrating the logic of the communication control module determining the control method for the energy recovery module in an embodiment of the present invention.

[0043] Figure 4 This is a simplified circuit connection diagram of the energy recovery module according to an embodiment of the present invention;

[0044] In the diagram: 1-Conversion unit, 2-Energy storage unit, 3-First switch, 4-Second switch. Detailed Implementation

[0045] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0046] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0047] It should be noted that in the description of this invention, the terms "upper," "lower," "inner," "outer," etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0048] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Please see Figure 1 The diagram shown is a system block diagram of a manhole cover system for energy recovery monitoring according to an embodiment of the present invention. The manhole cover system for energy recovery monitoring of the present invention includes:

[0050] A manhole cover assembly includes a manhole cover, a mounting frame encircling the edge of the manhole cover, and an energy recovery module buried under the manhole cover to convert and store the mechanical energy of vibrations to the manhole cover into electrical energy, wherein the edge of the manhole cover is coated with a magnetic material.

[0051] The information monitoring component includes an RFID chip embedded in the back of the manhole cover, a sensor set on the mounting frame to collect the magnetic field strength emitted by the magnetic material, and a current monitoring unit to obtain the current strength of the current converted into electrical energy in the energy recovery module.

[0052] Specifically, the present invention does not limit the specific structure of the sensor, which can be a Hall sensor. Using a Hall sensor to detect the magnetic field strength of a magnetic material is existing technology, and will not be described in detail here.

[0053] Specifically, the present invention does not limit the specific structure of the current monitoring unit, which can be a miniature ammeter installed in the energy recovery circuit, and will not be described in detail here.

[0054] The association construction module is connected to the information monitoring component to obtain in advance the change in magnetic field strength of the sensor and the current intensity of the current monitoring unit within a certain number of pre-collection periods, and to construct the corresponding association relationship between the change in magnetic field strength and the current intensity.

[0055] Specifically, the magnetic field strength in this invention can be the magnetic field strength in the direction perpendicular to the horizontal ground.

[0056] In practice, the duration of the pre-acquisition period can be set by those skilled in the art. If the duration of the pre-acquisition period is set too long, the data of magnetic field strength change will lack representativeness. If the duration of the pre-acquisition period is set too short, the magnitude of the magnetic field strength change will not be clearly distinguished. Therefore, those skilled in the art set the duration of the pre-acquisition period to be in the range of [1.5, 3], with the unit of interval being s. Preferably, the duration of the acquisition period is set to 1.8s.

[0057] Specifically, the correlation building unit in this invention can be a data storage device used to store the corresponding correlation between the changes in magnetic field strength and the current strength.

[0058] The signal analysis module, which is connected to the association construction module, is used to obtain the change in magnetic field strength of the sensor within several monitoring cycles during the manhole cover reset monitoring period, and to determine the reset status category of the manhole cover based on the numerical distribution of the current intensity corresponding to each change in magnetic field strength.

[0059] Specifically, the signal analysis module in this invention can be a data processor that stores the reset state category determination algorithm, which will not be elaborated here.

[0060] The communication control module is connected to the signal analysis module, the association construction module, and the manhole cover assembly, respectively. It is used to update the corresponding association relationship of the association construction module according to the reset state category of the manhole cover, or to determine the control mode of the energy recovery module according to the current intensity corresponding to the change in magnetic field strength.

[0061] Specifically, the communication control module in this invention can be a data processor or a microcontroller with data receiving and data sending functions, used to send control commands to different controlled objects according to the received signals, which will not be elaborated here.

[0062] Specifically, the energy recovery module in the manhole cover assembly is buried under the manhole cover. When the manhole cover vibrates due to external forces such as being run over by vehicles or stepped on by pedestrians, the conversion unit in the energy recovery module uses physical principles such as electromagnetic induction and piezoelectric effect to convert this mechanical energy into electrical energy. The electrical energy generated by the conversion unit is transmitted to the energy storage unit for storage. The energy storage unit can be an energy storage device such as a battery or capacitor, so that the recovered electrical energy can be used to power other modules of the smart manhole cover system. The edge of the manhole cover is coated with magnetic material. When the manhole cover vibrates, the magnetic field around the magnetic material will change. The sensor installed on the mounting frame can collect the magnetic field strength emitted by the magnetic material in real time.

[0063] Specifically, the RFID chip on the back of the manhole cover stores the authorized personnel's identification code, operation time, and location information.

[0064] Specifically, as is well known to those skilled in the art, RFID chips are radio frequency identification chips, which have advantages such as non-contact identification, strong anti-interference ability, large data storage capacity and fast identification speed. This invention uses an RFID chip on the back of the manhole cover to store the identification code of authorized personnel, which can prevent the manhole cover from being opened by unauthorized personnel and causing safety hazards. By storing the operation time, the historical data of the manhole cover being opened can be recorded. By storing the location information, it is convenient to issue timely abnormal warnings and make it easy for terminal maintenance personnel to quickly locate the manhole cover in an abnormal state.

[0065] Specifically, the correlation construction module is used to construct the corresponding correlation between the change in magnetic field strength and the current intensity, wherein,

[0066] The association construction module determines the average current intensity of several current intensities corresponding to each change in magnetic field intensity as a current intensity reference value based on the change in magnetic field intensity of the sensor and the current intensity of the current monitoring unit within several pre-collection periods, and constructs a corresponding association relationship between each change in magnetic field intensity and the current intensity reference value.

[0067] Specifically, those skilled in the art will understand that different vibration intensities of manhole covers result in different changes in magnetic field strength, which in turn leads to changes in the generated electrical current. By establishing a correlation between the change in magnetic field strength and the current intensity, the energy conversion pattern under different vibration intensities can be accurately grasped.

[0068] Specifically, by establishing the correspondence between changes in magnetic field strength and current intensity, a clear and reliable reference can be provided for judging the reset status of manhole covers. The correlation between changes in magnetic field strength and current intensity under normal conditions can be clearly presented. Abnormal current intensity values ​​can be detected in a timely manner based on the pre-constructed relationship, thereby improving the representativeness of data extraction for manhole cover status analysis.

[0069] Specifically, the monitoring period for manhole cover reset is a preset time period after the manhole cover has completed its operation.

[0070] In implementation, the manhole cover reset monitoring period is the preset time period after the manhole cover has completed its operation and entered the reset state. The longer the preset time period, the more manhole cover reset monitoring periods can be set. However, too many manhole cover reset monitoring periods will lead to data redundancy. Therefore, the preset time period is set to [5, 30], with the interval unit being min. Preferably, a preset time period of 10 min is provided here, and the duration of the manhole cover reset monitoring period is the same as the duration of the pre-collection period.

[0071] Specifically, the signal analysis module is used to obtain the change in magnetic field strength of the sensor during several manhole cover reset monitoring periods, and to obtain several current intensities corresponding to the same change in magnetic field strength, thereby constructing a set of current intensity values ​​corresponding to each change in magnetic field strength.

[0072] Specifically, please refer to Figure 2 The diagram shown is a logic flowchart of the signal analysis module determining the reset state category of the manhole cover according to an embodiment of the present invention. The signal analysis module is used to determine the reset state category of the manhole cover.

[0073] The signal analysis module determines the reference values ​​of current intensity and the corresponding set of current intensity values ​​corresponding to the changes in magnetic field intensity.

[0074] If any change in magnetic field strength corresponds to a current intensity reference value that falls within the range of the current intensity value set corresponding to that change in magnetic field strength, then the signal analysis module determines the reset state category of the manhole cover as the stable reset state category.

[0075] If any change in magnetic field strength corresponds to a current intensity reference value that does not fall within the range of the current intensity value set corresponding to that change in magnetic field strength, then the signal analysis module determines that the reset state of the manhole cover is an unstable reset state.

[0076] Those skilled in the art will understand that the energy recovery module beneath the manhole cover can convert the mechanical energy of the manhole cover's vibration into electrical energy. Simultaneously, the edges of the manhole cover are coated with a magnetic material. When the manhole cover vibrates, the magnetic field around the magnetic material changes. Sensors mounted on the mounting frame can collect this change in magnetic field strength. The change in magnetic field strength reflects the vibration of the manhole cover, while the current intensity reflects the effectiveness of the energy recovery module in converting mechanical energy into electrical energy. Under normal and stable conditions, there is a certain correspondence between the vibration of the manhole cover and the converted electrical energy. If any change in magnetic field strength corresponds to a current intensity reference value that falls within the range of the set of current intensity values ​​corresponding to that change in magnetic field strength, it indicates that the actually monitored current intensity is consistent with the predicted value. If the established stable correspondence is consistent, it indicates that the current intensity output by the energy recovery module is within the normal expected range, reflecting that the relationship between the vibration of the manhole cover and the energy conversion effect is stable. That is, the reset state category of the manhole cover is the stable reset state category. If the reference value of the current intensity corresponding to any change in magnetic field intensity does not belong to the numerical range of the current intensity value set corresponding to that change in magnetic field intensity, it indicates that the actual monitored current intensity deviates from the pre-established stable correspondence. This may be because the manhole cover is not reset properly, which changes its vibration and affects the energy conversion effect of the energy recovery module, causing the current intensity to exceed the normal expected range. In this case, the reset state category of the manhole cover is determined to be the unstable reset state category.

[0077] Specifically, by comparing the reference value of current intensity with the range of current intensity values, this invention can accurately determine whether the manhole cover reset state is stable. It can promptly identify manhole covers with unstable reset states, allowing the system to take countermeasures in advance to avoid affecting the normal operation of the energy recovery module due to poor manhole cover reset, thus ensuring stable system operation. Furthermore, it enables comparative analysis of energy recovery data after manhole cover reset, scientifically and reliably distinguishing the categories of manhole cover reset states.

[0078] Specifically, the communication control module is used to obtain the reset state category of the manhole cover. If the reset state category of the manhole cover is the stable reset state category, the communication control module controls the association construction module to update the corresponding association between the change in magnetic field strength and the current strength.

[0079] If the reset state category of the manhole cover is the unstable reset state category, the communication control module determines the control method of the energy recovery module based on the current intensity corresponding to each change in magnetic field strength.

[0080] Specifically, the communication control module controls the correlation construction module to update the corresponding correlation between the change in magnetic field strength and the current intensity, wherein,

[0081] The communication control module acquires the set of current intensity values ​​corresponding to the change in magnetic field strength, calculates the average value of the current intensity values ​​in the set, and updates the reference value of the current intensity corresponding to the change in magnetic field strength based on the average value and the average value of the reference value of the current intensity corresponding to the change in magnetic field strength.

[0082] Specifically, by updating the corresponding correlation, this invention can more accurately grasp the relationship between the change in magnetic field strength and the current intensity. Thus, based on the actual change in magnetic field strength, it can more accurately determine the working status of the energy recovery module. It is understood that changes in the external environment of the manhole cover, such as changes in temperature, humidity, or changes in surrounding road conditions and traffic flow, may cause changes in the correlation between the change in magnetic field strength and the current intensity. When it is determined that the manhole cover reset state is stable, timely updating the corresponding correlation enables the system to better adapt to these environmental changes and ensure the accuracy and reliability of energy recovery monitoring.

[0083] Specifically, please refer to Figure 3 The diagram shown is a logic flowchart illustrating how the communication control module determines the control method for the energy recovery module according to an embodiment of the present invention. The determination of the control method by the communication control module includes:

[0084] If the numerical distance between the current intensity corresponding to the change in magnetic field strength and the numerical value set of the current intensity corresponding to the change in magnetic field strength is less than a preset numerical distance threshold d c Then the communication control module controls the energy recovery module to connect the capacitive protection branch;

[0085] If the numerical distance between the current intensity corresponding to the change in magnetic field strength and the numerical value set of the current intensity corresponding to the change in magnetic field strength is greater than or equal to a preset numerical distance threshold d c If the communication control module disconnects the internal circuit of the energy recovery module, it reads the location information from the RFID chip in the manhole cover and issues an alarm.

[0086] Specifically, the communication control module is also connected to the maintenance terminal, which can send the latitude and longitude information of the manhole cover in the RFID chip or the pre-set manhole cover number to the maintenance terminal. After receiving the manhole cover location information, the maintenance terminal will issue an alarm prompt.

[0087] In implementation, the first difference between the maximum current intensity and the current intensity in the current intensity value set, and the second difference between the minimum current intensity and the current intensity in the current intensity value set are calculated in advance. The minimum value between the first difference and the second difference is determined as the numerical distance, and the numerical distance threshold d is set. c The value can be determined based on the maximum current intensity A in the set of current intensity values. maxWith the minimum current intensity A min Calculation determines, for example, d c =(A max -A min )×μ, where μ is a value factor, preferably μ can be 0.25.

[0088] It is understood that when the distance between the current intensity of the magnetic field strength change and the corresponding current intensity value set is less than a preset threshold, it means that the current has fluctuated to a certain extent, but the fluctuation amplitude is relatively small. At this time, the capacitive protection branch of the energy recovery module is connected. The capacitive protection branch can buffer and regulate the current, avoid damage to the electrical components inside the energy recovery module caused by abnormal fluctuations in the current amplitude, extend the service life of the equipment, and reduce the cost of equipment maintenance and replacement. When the distance between the current intensity and the value set is greater than or equal to the preset threshold, it indicates that the current fluctuation amplitude is large, and there may be a risk of serious electrical faults such as short circuits and overloads. Timely control of the internal circuit of the energy recovery module to disconnect can effectively prevent the fault from expanding further, avoid irreversible damage to key components such as the conversion unit and energy storage unit inside the module, and ensure the overall safety of the equipment.

[0089] Specifically, this invention adopts different control methods according to the current fluctuation, realizing dynamic and precise control of the energy recovery module. Whether it is a small current fluctuation or a large anomaly, the system can make corresponding handling, so that the energy recovery module can maintain a relatively stable operating state under complex working conditions. Through timely response and handling of current anomalies, the system can issue a signal before the fault worsens, reminding maintenance personnel to take timely measures for prevention and repair, reducing the probability of sudden equipment failure, and improving the stability and reliability of the manhole cover energy recovery system.

[0090] Please see Figure 4 The diagram shown is a simplified circuit connection diagram of the energy recovery module in an embodiment of the present invention. The present invention also provides a smart manhole cover based on multi-source information, comprising:

[0091] The manhole cover has its edges coated with magnetic material;

[0092] The mounting frame is circumferentially disposed around the edge of the manhole cover to support the manhole cover and is hinged to the manhole cover so that the manhole cover can be opened relative to the horizontal ground.

[0093] An RFID chip, embedded in the back of the manhole cover, is used to store the authorized personnel's identification code, work duration, and location information.

[0094] A sensor, mounted on the mounting frame, is used to collect the magnetic field strength emitted by the magnetic material;

[0095] An energy recovery module, buried under a manhole cover, includes a conversion unit 1 for converting mechanical energy into electrical energy and an energy storage unit 2 for storing electrical energy. The energy storage unit 2 is connected to the conversion unit 1 via a connection circuit, which includes a capacitive protection branch.

[0096] Please continue reading. Figure 4 As shown, the conversion unit 1 converts the mechanical energy of the manhole cover vibration into electrical energy, and introduces the electrical energy into the energy storage unit 2 through the circuit where the first switch 3 is located. When it is necessary to connect the capacitive protection branch, the first switch 3 is opened and the second switch 4 is closed, and the capacitive protection branch where the second switch 4 is located is connected. When it is necessary to disconnect the internal circuit of the energy recovery module, both the first switch 3 and the second switch 4 are opened to prevent the energy storage unit 2 from being impacted by abnormal current.

[0097] In practice, the conversion unit of the present invention can utilize the law of electromagnetic induction to generate an induced electromotive force by causing relative motion between the internal conductor and the magnetic field when the manhole cover vibrates, thereby realizing the conversion of mechanical energy into electrical energy. Preferably, the relative motion between the permanent magnet and the coil can cut the magnetic field lines of the coil, generating an induced current in the coil. The technology of converting vibration mechanical energy into electrical energy using the law of electromagnetic induction is widely used and will not be elaborated here. The energy storage unit in the present invention can be a storage battery.

[0098] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A smart manhole cover system for energy recovery monitoring, characterized in that, include: A manhole cover assembly includes a manhole cover, a mounting frame encircling the edge of the manhole cover, and an energy recovery module buried under the manhole cover to convert and store the mechanical energy of vibrations to the manhole cover into electrical energy, wherein the edge of the manhole cover is coated with a magnetic material. The information monitoring component includes an RFID chip embedded in the back of the manhole cover, a sensor set on the mounting frame to collect the magnetic field strength emitted by the magnetic material, and a current monitoring unit to obtain the current strength of the current converted into electrical energy in the energy recovery module. The association construction module is connected to the information monitoring component to obtain in advance the change in magnetic field strength of the sensor and the current intensity of the current monitoring unit within a certain number of pre-collection periods, and to construct the corresponding association relationship between the change in magnetic field strength and the current intensity. The signal analysis module, which is connected to the association construction module, is used to obtain the change in magnetic field strength of the sensor within several monitoring cycles during the manhole cover reset monitoring period, and to determine the reset status category of the manhole cover based on the numerical distribution of the current intensity corresponding to each change in magnetic field strength. The communication control module is connected to the signal analysis module, the association construction module, and the manhole cover assembly, respectively. It is used to update the corresponding association relationship of the association construction module according to the reset state category of the manhole cover, or to determine the control mode of the energy recovery module according to the current intensity corresponding to the change in magnetic field strength.

2. The intelligent manhole cover system for energy recovery monitoring according to claim 1, characterized in that, The RFID chip on the back of the manhole cover stores the authorized personnel's identification code, work duration, and location information.

3. The intelligent manhole cover system for energy recovery monitoring according to claim 2, characterized in that, The correlation construction module is used to construct the corresponding correlation between the change in magnetic field strength and the current strength, wherein, The association construction module determines the average current intensity of several current intensities corresponding to each change in magnetic field intensity as a current intensity reference value based on the change in magnetic field intensity of the sensor and the current intensity of the current monitoring unit within several pre-collection periods, and constructs a corresponding association relationship between each change in magnetic field intensity and the current intensity reference value.

4. The intelligent manhole cover system for energy recovery monitoring according to claim 3, characterized in that, The monitoring period for manhole cover reset is a preset time period after the manhole cover has completed its operation.

5. The intelligent manhole cover system for energy recovery monitoring according to claim 4, characterized in that, The signal analysis module is used to obtain the change in magnetic field strength of the sensor during several manhole cover reset monitoring periods, and to obtain several current intensities corresponding to the same change in magnetic field strength, and to construct a set of current intensity values ​​corresponding to each change in magnetic field strength.

6. The intelligent manhole cover system for energy recovery monitoring according to claim 5, characterized in that, The signal analysis module is used to determine the reset status category of the manhole cover, wherein, The signal analysis module determines the reference values ​​of current intensity and the corresponding set of current intensity values ​​corresponding to the changes in magnetic field intensity. If any change in magnetic field strength corresponds to a current intensity reference value that falls within the range of the current intensity value set corresponding to that change in magnetic field strength, then the signal analysis module determines the reset state category of the manhole cover as the stable reset state category. If any change in magnetic field strength corresponds to a current intensity reference value that does not fall within the range of the current intensity value set corresponding to that change in magnetic field strength, then the signal analysis module determines that the reset state of the manhole cover is an unstable reset state.

7. The intelligent manhole cover system for energy recovery monitoring according to claim 6, characterized in that, The communication control module is used to obtain the reset state category of the manhole cover. If the reset state category of the manhole cover is the stable reset state category, the communication control module controls the association construction module to update the corresponding association relationship between the change in magnetic field strength and the current strength. If the reset state category of the manhole cover is the unstable reset state category, the communication control module determines the control method of the energy recovery module based on the current intensity corresponding to each change in magnetic field strength.

8. The intelligent manhole cover system for energy recovery monitoring according to claim 7, characterized in that, The communication control module controls the correlation construction module to update the corresponding correlation between the change in magnetic field strength and the current strength, wherein, The communication control module acquires the set of current intensity values ​​corresponding to the change in magnetic field strength, calculates the average value of the current intensity values ​​in the set, and updates the reference value of the current intensity corresponding to the change in magnetic field strength based on the average value and the average value of the reference value of the current intensity corresponding to the change in magnetic field strength.

9. The intelligent manhole cover system for energy recovery monitoring according to claim 7, characterized in that, The communication control module determines the control method for the energy recovery module, including: If the numerical distance between the current intensity of the change in magnetic field strength and the numerical set of the current intensity of the change in magnetic field strength is less than a preset numerical distance threshold, then the communication control module controls the energy recovery module to connect the capacitive protection branch. If the numerical distance between the current intensity of the change in magnetic field strength and the numerical value set of the current intensity of the change in magnetic field strength is greater than or equal to a preset numerical distance threshold, the communication control module controls the internal circuit of the energy recovery module to disconnect and reads the RFID chip location information of the manhole cover to issue an alarm.

10. A smart manhole cover based on multi-source information, used in the smart manhole cover system for energy recovery monitoring as described in any one of claims 1-9, characterized in that, include: The manhole cover has its edges coated with magnetic material; The mounting frame is circumferentially disposed around the edge of the manhole cover to support the manhole cover and is hinged to the manhole cover so that the manhole cover can be opened relative to the horizontal ground. An RFID chip, embedded in the back of the manhole cover, is used to store the authorized personnel's identification code, work duration, and location information. A sensor, mounted on the mounting frame, is used to collect the magnetic field strength emitted by the magnetic material; An energy recovery module, buried under a manhole cover, includes a conversion unit for converting mechanical energy into electrical energy and an energy storage unit for storing electrical energy. The energy storage unit and the conversion unit are connected by a connection circuit, which includes a capacitive protection branch.

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