Multifunctional intelligent well lid monitoring terminal equipment

Abstract

The utility model relates to the technical field of intelligent monitoring devices, and provides multifunctional intelligent well lid monitoring terminal equipment which comprises an equipment cabin, a power management unit, an NB main control unit and a sensor expansion board. Through mutual cooperation of all units, the equipment can be suitable for underground environment installation in multiple scenes. The electric management unit is responsible for collecting power supply related data; the sensor expansion board is responsible for collecting connected sensor data; the NB control unit is responsible for uploading the collected power supply data, sensor data and equipment data to the telecom Internet of Things cloud platform. And the functions of remote instruction control, data monitoring, OTA online upgrading and the like of the equipment can be realized through a telecom internet of things cloud platform. The equipment integrates the functions of geographic position information service, network disconnection continuous transmission service, local storage, low power consumption and the like, and the stability and the cruising ability of the equipment are improved. A novel underground water level monitoring mode is provided, two-section type water level monitoring is adopted, the throw-in type water level sensor is prevented from being affected by pipeline water flow and sundries, measurement is more accurate, and stability is higher. In the aspect of cover opening monitoring, monitoring of the opening and closing state of the well cover is achieved through a special well cover structure and a magnetoresistive sensor, and monitoring is more stable.

Description

Technical Field

[0001] The utility model generally relates to the technical field of intelligent monitoring devices. Specifically, the utility model relates to a multifunctional intelligent manhole cover monitoring terminal device. Background Art

[0002] With the acceleration of urban development, the urban underground pipe network system is becoming increasingly complex, and the traditional manhole cover management method can no longer meet the needs of modern urban management. In order to improve the intelligent level of urban infrastructure, ensure the safe operation of the city, and improve the city's emergency response capabilities, it is an important measure to install appropriate monitoring terminal equipment for different types of manhole covers in the city.

[0003] Traditional intelligent manhole cover monitoring terminal devices are designed independently according to different application scenarios. Installing different types of manhole cover monitoring terminal devices from different manufacturers will greatly increase the deployment cost. At the same time, in terms of manhole cover management, there are also disadvantages such as high maintenance cost and low management efficiency.

[0004] In terms of the deployment of intelligent manhole cover terminal equipment, the common method is to deploy the terminal equipment under the manhole cover or on the inner wall of the well. In actual application scenarios, both methods have their own limitations. Deploying the monitoring terminal under the cover can be analyzed from the user perspective and the product perspective. From the user's perspective, due to the limited space at the bottom of the cover, the function of the equipment is often single, which does not meet the actual needs of customers for diversification and customization. From a product perspective, since the cover often produces a large number of micro-movements, it is easy to cause significant damage to components, causing the equipment to suddenly fail to work normally, increasing maintenance costs. Installing on the inner wall of the well is not conducive to the installation of the equipment and affects the workers' underground operations.

[0005] In terms of underground water level monitoring, immersion level sensors are usually used for level collection. When the sensor is installed at the bottom of the pipe, it is usually affected by water flow and debris in the pipe, causing the sensor to deviate, ultimately leading to inaccurate reading of the liquid level data.

[0006] In terms of cover opening alarm monitoring, a tilt sensor is usually sampled to determine whether the cover is opened. This sensor is usually very sensitive to the tilt angle and there is a high probability of false alarm when a vehicle passes by. Utility Model Content

[0007] In order to at least partially solve the above problems in the prior art, the utility model proposes a multifunctional intelligent manhole cover monitoring terminal device, comprising:

[0008] An equipment cabin, which is arranged on the base of the manhole cover;

[0009] A power management unit, which is arranged inside the device cabin, and is configured to supply power to the device and transmit power data to the NB main control unit;

[0010] a sensor expansion board, which is arranged inside the device cockpit, the sensor expansion board is connected to one or more sensors, wherein the sensor expansion board is configured to transmit sensor data to a NB main control unit; and

[0011] A NB main control unit is arranged inside the device cabin, and the NB main control unit is configured to upload the power data, the sensor data and the device data to a cloud platform.

[0012] In one embodiment of the present utility model, it is provided that the power management unit includes:

[0013] a solar panel configured to charge a lithium battery pack;

[0014] Lithium battery packs and dry cell batteries configured to power the device;

[0015] a thermistor configured to obtain a surface temperature of the lithium battery; and

[0016] The power control board is configured to collect power information and transmit the power information to the NB main control unit.

[0017] In one embodiment of the present invention, it is provided that the power management unit includes a plurality of solar panels, and the plurality of solar panels are configured to form a plurality of charging channels to charge the lithium battery pack.

[0018] In one embodiment of the present invention, it is provided that the device further comprises:

[0019] A lithium battery compartment is arranged outside the equipment cabin, wherein the lithium battery pack is arranged in the lithium battery compartment to facilitate replacement of the lithium battery pack.

[0020] In one embodiment of the present utility model, it is provided that the power management unit further includes:

[0021] A magnetically controlled switch, wherein the lithium battery pack is the default power supply for the device, and when the device voltage is lower than the set voltage, the power control board switches the power supply to the dry battery, and after replacing the lithium battery pack, the power control board is restarted through the magnetically controlled switch to switch the power supply back to the lithium battery pack.

[0022] In one embodiment of the present utility model, it is provided that the NB main control unit includes:

[0023] The NB module is configured to upload power data, sensor data, and device data to the cloud platform;

[0024] A positioning chip, which is positioned to locate the device;

[0025] a memory chip configured to store sensor data; and

[0026] A Bluetooth chip is configured to perform Bluetooth data transmission.

[0027] In one embodiment of the present invention, it is provided that the device further comprises:

[0028] The antenna compartment is arranged outside the equipment cabin, and a NB antenna and a Bluetooth antenna are arranged in the antenna compartment, and the NB antenna and the Bluetooth antenna are connected to the NB main control unit.

[0029] In one embodiment of the present invention, it is provided that the sensor includes one or more of the following:

[0030] a water level sensor configured to monitor a water level in the well;

[0031] a methane sensor configured to monitor a methane gas concentration within the well;

[0032] A magnetoresistive sensor configured to monitor a magnetic field state to determine an open or closed state of the manhole cover; and

[0033] A tension sensor is connected to the debris collection bag, and the tension sensor is configured to measure the weight of the debris collection bag.

[0034] In one embodiment of the present utility model, it is provided that the water level sensor comprises:

[0035] an electrode type water level sensor configured to monitor the water level in the well when the water level in the well is lower than the drainage pipe; and

[0036] A submersible liquid level sensor is configured to monitor the water level in the well when the water level in the well is higher than the drainage pipe.

[0037] In one embodiment of the present utility model, it is provided that the electrode type water level sensor comprises:

[0038] Stainless steel pipes with round or square cross-sections;

[0039] A plurality of stainless steel studs are arranged at different lengths of the stainless steel pipe, wherein the stainless steel studs are covered with heat shrink tubing; and

[0040] A signal line is wound around a stainless steel screw and fixed to the stainless steel stud via the stainless steel screw, wherein the signal line has a plurality of electrodes, and the plurality of electrodes are respectively arranged at a plurality of stainless steel studs.

[0041] The utility model has at least the following beneficial effects:

[0042] (1) Compared with existing monitoring equipment, this device can be used for underground environmental monitoring in most scenarios in the city, including but not limited to power wells, drainage wells, communication wells, sewage wells, etc. Using one set of equipment can improve the deployable efficiency and management efficiency, and reduce the development cost and maintenance cost. The independent lithium battery compartment can automatically switch to dry battery power supply when the lithium battery power is too low, and perform alarm processing to remind the staff to replace the lithium battery, which greatly improves the life cycle of the equipment. At the same time, it can be used with solar panels to charge the lithium battery, further increasing the service life of the equipment.

[0043] (2) A new deployment method and equipment compartment are used to place the equipment on the base of the manhole cover, which reduces the impact of micro-movement of the cover surface on the equipment and improves the integration level of the manhole cover. The independent external antenna compartment makes the wireless signal transmission more stable and the positioning more accurate.

[0044] (3) A two-stage liquid level acquisition device is used. In the low water level state, a lower power consumption electrode type water level sensor is used for liquid level acquisition. When the water level exceeds the pipeline, a submersible liquid level sensor is used to measure the water level more accurately. This method reduces the power consumption of the equipment and avoids the impact of water flow or pipeline debris on the sensor. The use of a circular stainless steel bracket to install the flow rate sensor can greatly reduce the difficulty of sensor installation and subsequent maintenance and cleaning. The magnetic switch sensor and installation structure used improve the anti-interference ability of manhole cover monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] To further illustrate the advantages and features of the various embodiments of the present invention, a more detailed description of the various embodiments of the present invention will be presented with reference to the accompanying drawings. It will be understood that these drawings only depict typical embodiments of the present invention and are therefore not to be considered as limiting the scope thereof. In the accompanying drawings, for clarity, identical or corresponding components will be represented by identical or similar reference numerals.

[0046] Figure 1 A schematic diagram of application classification of a multifunctional intelligent manhole cover monitoring terminal device in one embodiment of the utility model is shown.

[0047] Figure 2 A system block diagram of a multifunctional intelligent manhole cover monitoring terminal device in one embodiment of the utility model is shown.

[0048] Figure 3 A schematic diagram of a manhole cover surface of an intelligent manhole cover in one embodiment of the utility model is shown.

[0049] Figure 4A schematic diagram of a manhole cover base of an intelligent manhole cover in one embodiment of the utility model is shown.

[0050] Figure 5 A connection diagram of a multifunctional intelligent manhole cover monitoring terminal device in one embodiment of the utility model is shown.

[0051] Figure 6 An explosion diagram of a multifunctional intelligent manhole cover monitoring terminal device in one embodiment of the utility model is shown.

[0052] Figure 7 The figure shows an installation diagram of a downhole water level sensor in one embodiment of the utility model.

[0053] Figure 8 A schematic diagram of a flow velocity sensor at a pipe network drain outlet in one embodiment of the utility model is shown.

[0054] Fig. 9 The exploded schematic diagram of an electrode type water level sensor in one embodiment of the utility model is shown.

[0055] Fig.10 A schematic diagram showing installation details of a magnetically controlled switch in one embodiment of the utility model is shown.

[0056] Reference numerals:

[0057] 1. Manhole cover, 2. Manhole cover base, 3. Main equipment, 4. Magnetic group sensor, 5. Lithium battery compartment, 6. Antenna equipment compartment, 7. IP68 waterproof plug, 8. IP68 airtight valve, 9. Waterproof connector, 10. Equipment cabin cover, 11. Equipment cabin sealing rubber ring, 12. Power control board, 13. NB main control board, 14. Sensor expansion board, 15. Equipment cabin shell, 16. Round magnet, 17. Methane sensor, 18. Tension sensor, 19. Electrode liquid level sensor, 20. Submersible liquid level sensor, 21. Solar panel, 22. Multi-source positioning antenna Wire module, 23. NB antenna, 24. Bluetooth antenna, 25. Lithium battery compartment cover, 26. Lithium battery compartment sealing rubber ring, 27. Lithium battery pack, 28. Thermistor, 29. Lithium battery compartment shell, 30. Customized downhole stainless steel bracket, 31. Magnetoresistive sensor mounting groove, 32. Magnetic control switch, 33. Dry battery, 34. Antenna perforation, 35. Stainless steel studs, 36. Stainless steel screws, 37. Electrode water level sensor signal line, 38. Heat shrink tube, 39 Stainless steel tube, 40. Doppler flow sensor, 41. Round stainless steel mounting tube, 42. Stainless steel bracket. DETAILED DESCRIPTION

[0058] It should be noted that the components in the figures may be shown exaggeratedly for the sake of illustration and are not necessarily true to scale. In the figures, identical or functionally identical components are provided with the same reference numerals.

[0059] In the present invention, unless otherwise specified, "arranged on...", "arranged above..." and "arranged above..." do not exclude the existence of an intermediate object between the two. In addition, "arranged on or above..." only indicates the relative positional relationship between two components, and in certain circumstances, such as after reversing the product direction, it can also be converted into "arranged under or below...", and vice versa.

[0060] In the present invention, each embodiment is only intended to illustrate the solution of the present invention and should not be understood as limiting.

[0061] In the present invention, unless otherwise specified, the quantifiers "a", "an" and "an" do not exclude the presence of multiple elements.

[0062] It should also be noted that in the embodiments of the present invention, for the sake of clarity and simplicity, only a portion of the components or assemblies may be shown, but those of ordinary skill in the art will understand that under the teachings of the present invention, the required components or assemblies may be added according to the needs of the specific scenario. In addition, unless otherwise specified, the features in different embodiments of the present invention may be combined with each other. For example, a feature in the second embodiment may be used to replace a feature in the first embodiment that corresponds to or has the same or similar functions, and the resulting embodiment also falls within the disclosure scope or recorded scope of the present application.

[0063] It should also be pointed out that within the scope of the present invention, the terms "same", "equal", "equal to" and the like do not mean that the values ​​of the two are absolutely equal, but allow a certain reasonable error, that is, the terms also cover "substantially the same", "substantially equal", "substantially equal to". By analogy, in the present invention, the terms "perpendicular to", "parallel to", etc. indicating directions also cover the meanings of "substantially perpendicular to" and "substantially parallel to".

[0064] In addition, the numbering of the steps of the methods of the present invention does not limit the execution order of the method steps. Unless otherwise specified, the method steps can be executed in different orders.

[0065] The present invention will be further described below in conjunction with specific embodiments with reference to the accompanying drawings.

[0066] The utility model proposes a multifunctional intelligent manhole cover monitoring terminal device, which includes a device cockpit and a power management unit, a narrowband Internet of Things (NB) main control board and a sensor expansion board arranged inside the device cockpit. The device cockpit can be arranged on the manhole cover base and fixed by buckles. Figure 1 The following is a schematic diagram showing the application classification of a multifunctional intelligent manhole cover monitoring terminal device in one embodiment of the utility model. Figure 1 As shown, different circuit boards can be combined inside the equipment cabin, and corresponding sensors can be connected externally to achieve underground environment monitoring in different scenarios. Figure 1 The application scenarios of the present invention have been exemplified. However, those skilled in the art should understand that the above combinations are only examples and should not be regarded as limitations. Those skilled in the art can make combinations according to actual needs.

[0067] Figure 2 FIG. 1 shows a system block diagram of a multifunctional intelligent manhole cover monitoring terminal device in one embodiment of the utility model. Figure 2 As shown, the power management unit may include multiple solar panels (for example, 4 panels), lithium battery packs, dry batteries, magnetic switches, thermistors, and power control boards. The power management unit is used for the collection of parameters related to lithium batteries and dry batteries and power switching control. It has a built-in solar charging module and can optionally be equipped with 2 sets of solar charging panels to form a dual channel to charge the lithium battery pack. The lithium battery pack can be independently arranged outside the equipment cabin and docked with the equipment cabin through an IP68 waterproof plug. This method is convenient for later replacement of lithium batteries and users can customize the battery capacity to increase the use time of the device. The power management unit has a built-in magnetic switch for manually waking up the device, and can also keep the device in a low power consumption state through an external magnet during transportation. The power information collected by the power management unit may include dry battery voltage, lithium battery voltage, charging current of the first charging channel, charging current of the second charging channel, discharge current, charging current, and lithium battery temperature, and the collected power information is transmitted to the NB main control board through the RS485 interface.

[0068] The NB main control board is used to upload the collected power supply information, sensor information and device information to the cloud platform through the NB module. The NB main control board uses the NB module as the main control chip, and integrates multi-source positioning chips, large-capacity storage chips, Bluetooth chips, etc. to provide geographic information services, local data storage services and Bluetooth data transmission services for the device. Geographic information services can provide positioning functions for device terminals, which is convenient for device search. The local data storage function is convenient for reading sensor data stored locally through the Bluetooth module in the case of long-term data upload failure to prevent data loss. The device can connect to the communication operator's Internet of Things cloud platform through the networking function of the NB module to realize functions such as data upload, command issuance and software OTA upgrade. The software OTA function can make the equipment maintenance and update later, and the software upgrade is more convenient. The nylon plastic antenna compartment fixed on the base directional cover opening improves the signal strength and ensures the stability of data transmission. It has a built-in standard RS485 interface, which can be connected to the immersion liquid level sensor and flow rate sensor through a waterproof plug, and can also be expanded with a standard 485 sensor according to actual needs.

[0069] The sensor expansion board is used to expand the sensors required by the device. The unit can be connected to a methane gas sensor, an electrode water level sensor, and a magnetoresistive sensor. The methane gas sensor can collect the methane gas concentration in the well and is used in septic tanks, sewage wells, and other scenarios. The tension sensor can be connected to the tension collection bag device to measure the weight of the debris collection belt. The underground liquid level data is collected through two-stage data. In the low water level state (the water level does not exceed the top of the pipe), an electrode water level sensor is used to monitor the pipeline water level. By setting the number of electrode nodes, the pipeline water level can be freely graded and monitored. When the water level exceeds the drainage pipe, an immersion liquid level sensor is used to accurately measure the water level data. This method avoids the problem of inaccurate water level data caused by the sensor being affected by water flow and debris. In the scenario of monitoring the flow rate at the drainage outlet of the pipe network, a circular stainless steel pipe bracket can be used to install the flow rate sensor on the bracket, and the bracket can be installed by extending and retracting the bracket close to the bottom of the drainage pipe. The connection between the bracket and the sensor is connected as a water outlet. A stainless steel pipe is installed at the wellhead to install a high-pressure water gun above the corresponding bracket to clean the detection surface of the flow rate sensor. This installation method has a simple structure, easy deployment, and is very convenient for later maintenance and cleaning. The magnetoresistive sensor determines the opening and closing status of the manhole cover by monitoring the magnetic field, which improves the stability of the cover opening detection.

[0070] The equipment cabin is a specific shell installed on the circular track part of the manhole cover base. By placing the equipment here, it is ensured that it is not affected by the micro-movement of the manhole cover, and it is convenient for construction workers to work normally underground. The equipment is equipped with a waterproof and airtight valve. The airtight valve is used to balance the air pressure inside and outside the equipment through the characteristics of isolating water but conducting air, so that the immersion liquid level sensor can accurately obtain the atmospheric pressure and measure accurate water level data.

[0071] Figure 3 A schematic diagram of a manhole cover surface of an intelligent manhole cover in one embodiment of the utility model is shown. Figure 4 FIG. 1 is a schematic diagram showing a manhole cover base of an intelligent manhole cover in one embodiment of the utility model. Figure 3 and Figure 4 As shown, the manhole cover base 2 is located below the manhole cover surface 1, and the antenna equipment compartment 6 is arranged in a directional opening below the manhole cover surface 1.

[0072] Figure 5 A connection diagram of a multifunctional intelligent manhole cover monitoring terminal device in one embodiment of the utility model is shown. Figure 6 The figure shows an exploded schematic diagram of a multifunctional intelligent manhole cover monitoring terminal device in one embodiment of the utility model. Figure 5 and Figure 6 As shown, the connection process of the device includes:

[0073] S1. Arrange the power control board 12, NB main control board 13, and sensor expansion board 14 evenly inside the equipment cockpit 15. The circuit boards are connected through 4-pin RS485 terminals.

[0074] S2. Connect the IP68 waterproof connector 9 to the sensor that needs to be connected to the equipment cabin 15, insert the connecting wire into the waterproof connector and connect it to the internal sensor interface, and lock the buckle of the waterproof connector. Then install a waterproof breathable valve 8 for the equipment to balance the atmospheric pressure inside the equipment cabin to achieve accurate measurement of the immersive liquid level sensor 20. Install dry batteries 33 on the power control board to provide basic power for the equipment. Then install the magnetic control switch 32, which can externally control the power supply and power off of the equipment through a magnet. Optionally, in order to enhance the waterproof performance of the equipment, the internal circuit board can be filled with glue.

[0075] S3, place the lithium battery pack 27 in the lithium battery equipment compartment 29, and tightly fix the thermistor 28 to the lithium battery pack 27. One pin of the thermistor is used as a signal line, and the other pin is grounded with the lithium battery. Finally, tighten the lithium battery compartment waterproof rubber ring 26 and the lithium battery compartment cover 25 with self-tapping screws to seal the lithium battery compartment.

[0076] S4. Place the NB antenna 23, Bluetooth antenna 24, and multi-source positioning module 22 in the antenna compartment 6, and lead out the antenna signal line. The NB antenna and Bluetooth antenna can directly pass the signal line through the antenna through-hole 34 reserved in the equipment cockpit 15 and connect to the NB control board 13. The signal line of the multi-source positioning module is a serial port line, which needs to be connected to the NB control board through a waterproof plug 7, and the inside of the antenna compartment is sealed.

[0077] S5. Install the waterproof rubber ring 11 and the cover 10 on the equipment cabin 15, and tighten them with self-tapping screws.

[0078] S6. Install a waterproof plug 7 for the signal line led out of the equipment cockpit 15 and the matching sensor, and connect the sensor to the equipment through the waterproof plug 7.

[0079] S7. Optionally, four solar panels 21 are connected in series in pairs to form a two-way solar power supply group, and the two charging cables led out are connected to the device through the waterproof plug 7.

[0080] Figure 7 FIG. 2 shows a schematic diagram of the installation of a downhole water level sensor in one embodiment of the utility model. Figure 7 As shown, the waterproof plug 7 can be connected to the electrode type liquid level sensor 19 through the electrode type water level sensor signal line 37, and the waterproof plug 7 can also be connected to the immersion type liquid level sensor 20.

[0081] The specific embodiments of the present utility model are introduced below.

[0082] Example 1

[0083] The power management unit consists of 4 solar panels (optional), a lithium battery pack, dry batteries, a magnetic switch, a thermistor, and a power control board. The 4 solar panels are combined in pairs to form two dual channels to charge the lithium battery pack. A thermistor is installed in the lithium battery compartment to monitor the temperature data during the charging and discharging of the lithium battery. The installed magnetic switch is used to manually wake up the device, and can also keep the device in a low power consumption state through an external magnet during transportation.

[0084] Functional description: The power control board uses the domestic 32 microcontroller PY32F030K28U6 as the main control chip. The working steps are as follows:

[0085] Step S101: Perform necessary hardware and software initialization upon first power-on, including timer initialization, IO initialization, AD initialization, and necessary variable and function declarations.

[0086] Step S102, the control board enters the command receiving mode, waits for the main control board to send a data request command, and then collects data such as the dry battery voltage, lithium battery voltage, charging current of the first charging channel, charging current of the second charging channel, discharge current, charging current, lithium battery temperature, etc.

[0087] Step S103, detecting the voltages of the dry cell battery and the lithium cell battery, giving priority to the lithium cell battery for power supply, and switching to the dry cell battery for power supply when the lithium cell battery voltage is lower than 3.3V.

[0088] Step S104, encapsulate the collected data into Modbus protocol and send it to the main control board. Then enter the command receiving state and wait for new command reception.

[0089] Step S105, when no data request instruction is received from the main control board for more than 30 seconds, the system enters a low power consumption state, cuts off unnecessary chip power supply, and waits for a signal wake-up from the main control board.

[0090] Example 2

[0091] The main control unit consists of NB antenna, Bluetooth antenna, Beidou positioning module and NB main control board. The external NB antenna, Bluetooth antenna and Beidou positioning module are conducive to enhancing the signal of the equipment and avoiding the problem of signal loss caused by the manhole cover shell. The magnetic switch sensor and RS485 interface are reserved for independent deployment of simple functions.

[0092] Functional description: The NB main control board uses the MN316-DLVD module produced by China Mobile Internet of Things Co., Ltd. as the main control chip, and uses the OPENCPU method for software development. The following is the specific operation process.

[0093] Step S201: After the NB main control board is powered on, the hardware, software and network are initialized and checked.

[0094] Step S202: If everything goes well during device initialization, the Beidou positioning module will be started when the device is powered on for the first time to collect location information, and upload it to the telecom IoT cloud platform through the LwM2M protocol.

[0095] Step S203: In the case of not the first power-on wake-up, a data collection instruction is sent to the power management unit and the sensor unit to collect, process, package and upload data.

[0096] Step S204, when no operation instruction is received from the platform within 30 seconds, the device will enter the low power consumption mode according to the preset wake-up interval, and automatically wake up the device to collect and upload the next round of data after the wake-up interval is reached.

[0097] Here are some explanations of how the device works:

[0098] Upload interval mechanism: The data upload interval is divided into normal upload interval and alarm upload interval. The interval time of different modes can be remotely set through the platform. When the device detects abnormal water level or abnormal cover opening, it will enter the alarm mode and upload data according to the alarm interval period.

[0099] Network disconnection and resumption mechanism: When the device network is abnormal, the collected data will be saved in the storage chip, storing up to 2 days of data at intervals of 5 minutes. When the network is restored, the data will be uploaded to the platform again.

[0100] Bluetooth transmission function: The Bluetooth transmission function can be used to transfer the data of the past 20 days stored on the device to the mobile phone via Bluetooth, which can be used to supplement the data in case of abnormal data upload.

[0101] OTA upgrade function: In order to achieve later maintenance and upgrades, the OTA upgrade function is provided. The upgrade package can be sent through the platform to achieve remote upgrade of the device.

[0102] Example 3

[0103] Sensor unit

[0104] The types of sensors that can be connected are: methane gas sensor, electrode liquid level sensor, magnetic switch sensor and pressure sensor. The methane sensor is responsible for collecting the methane gas concentration in the well and sending the data to the MCU through the serial port; the electrode liquid level sensor is responsible for collecting the data of the pipeline water level; the magnetic switch is responsible for monitoring the opening and closing status of the well cover; the tension sensor can collect the weight of the debris collection bag under specific needs and remind the staff to replace the collection bag. Each sensor can be installed according to actual needs, which enhances the expansion capability of the equipment.

[0105] Functional description: The sensor expansion board uses the domestic 32 microcontroller PY32F030K28U6 as the main control chip. The working steps are as follows:

[0106] Step S301, perform necessary hardware and software initialization upon first power-on, including timer initialization, IO initialization, serial port initialization, etc. and necessary variable and function declarations.

[0107] Step S302, the sensor expansion board enters the command receiving mode, waits for the main control board to send a data request command, and then sends all sensor acquisition commands to analyze the collected data.

[0108] Step S304, encapsulate the collected data into Modbus protocol and send it to the main control board. Then enter the command receiving state and wait for new command reception.

[0109] Step S305, when no data request instruction is received from the main control board for more than 30 seconds, the system enters a low power consumption state, cuts off unnecessary chip power supply, and waits for a signal wake-up from the main control board.

[0110] The customized sensors of the utility model include an electrode-type liquid level sensor and a magnetic switch sensor. Since it is necessary to simply grade the water level of the drainage pipe, the water level monitoring sensors on the market do not meet the needs of practical applications. Therefore, the utility model uses the principle of water conductivity to design an electrode-type water level sensor. Using the principle of the sensitivity of the magnetoresistive chip to the magnetic field and the manhole cover link structure, a new cover opening monitoring method is designed.

[0111] Example 4

[0112] Fig. 9 FIG. 1 shows an exploded schematic diagram of an electrode type water level sensor in one embodiment of the utility model. Fig. 9 As shown, the electrode type water level sensor is composed of a stainless steel tube 39, a stainless steel stud 35, a stainless steel screw 36, a heat shrink tube 38 and a 6-core signal line 37. The assembly steps are as follows:

[0113] Step S401, remove the top of the stainless steel pipe with an electric saw, and use an electric drill to drill holes on the corresponding surface of the removed cover at 20%, 30%, 50%, 75%, 100% of the length and the bottom of the stainless steel pipe according to the length of the pipe.

[0114] Step S402, the stainless steel studs are covered with multi-layer heat shrink tubes to be isolated from the stainless steel tube. The node studs at the bottom do not need to be isolated.

[0115] Step S403, winding the signal line around the stainless steel screw and screwing it onto the stainless steel stud.

[0116] Step S404, the interior of the stainless steel pipe is filled with a sealing and waterproof glue, and then covered with a stainless steel cover.

[0117] Example 5

[0118] Figure 8 FIG. 1 is a schematic diagram of a flow velocity sensor for a pipe network drain outlet in one embodiment of the utility model. Figure 8 As shown, the Doppler flow velocity sensor 40 is fixed to the bracket at the end of the circular stainless steel pipe by screws, and the water outlet of the bracket is aligned with the detection surface of the sensor. During installation, the circular stainless steel bracket with the sensor is put on the outlet pipe, and the sensor extends into the pipe from the inside. At the top of the bracket, the bracket can be supported by a manhole cover according to the actual length, so that it is firmly fixed on the outlet pipe.

[0119] When cleaning the sensor, the bracket can be removed from the outlet pipe, and a high-pressure water gun can be used to flush water from above the pipe. The water flows along the pipe and sprays out from the bracket outlet. Since the outlet is aimed at the sensor detection surface, the silt and debris on the sensor detection surface can be cleaned. In this way, the sensor can be cleaned without workers going down the well.

[0120] Example 6

[0121] Fig.10 The schematic diagram of the installation details of the magnetic switch in one embodiment of the utility model is shown. The magnet is placed in the groove in the link structure of the cover and the base. The magnetic switch sensor is placed in the professional groove of the base. When the manhole cover is closed, the magnet is in close contact with the sensor, and the sensor outputs a low level; when the cover is opened, the link structure drives the magnet away from the sensor, and the sensor outputs a high level. The sensor expansion board monitors the opening of the manhole cover by the high and low level changes of the sensor output.

[0122] Although various embodiments of the utility model are described above, it should be understood that they are presented as examples only and not as limitations. It is obvious to those skilled in the relevant art that various combinations, modifications and changes can be made thereto without departing from the spirit and scope of the utility model. Therefore, the breadth and scope of the utility model disclosed herein should not be limited by the exemplary embodiments disclosed above, but should only be defined according to the attached claims and their equivalents.

Claims

1. A multifunctional intelligent manhole cover monitoring terminal device, characterized in that: include: An equipment cabin, which is arranged on the base of the manhole cover; A power management unit, which is arranged inside the device cabin, and is configured to supply power to the device and transmit power data to the NB main control unit; A sensor expansion board, which is arranged inside the device cockpit, the sensor expansion board is connected to one or more sensors, wherein the sensor expansion board is configured to transmit sensor data to a NB main control unit; as well as A NB main control unit is arranged inside the device cabin, and the NB main control unit is configured to upload the power data, the sensor data and the device data to a cloud platform.

2. The multifunctional intelligent manhole cover monitoring terminal device according to claim 1 is characterized in that: The power management unit comprises: a solar panel configured to charge a lithium battery pack; Lithium battery packs and dry cell batteries configured to power the device; a thermistor configured to obtain a surface temperature of the lithium battery; and The power control board is configured to collect power information and transmit the power information to the NB main control unit.

3. The multifunctional intelligent manhole cover monitoring terminal device according to claim 2 is characterized in that: The power management unit includes a plurality of solar panels, and the plurality of solar panels are configured to form a plurality of charging channels to charge the lithium battery pack.

4. The multifunctional intelligent manhole cover monitoring terminal device according to claim 2 is characterized in that: Also includes: A lithium battery compartment is arranged outside the equipment cabin, wherein the lithium battery pack is arranged in the lithium battery compartment to facilitate replacement of the lithium battery pack.

5. The multifunctional intelligent manhole cover monitoring terminal device according to claim 2 is characterized in that: The power management unit also includes: A magnetically controlled switch, wherein the lithium battery pack is the default power supply for the device, and when the device voltage is lower than the set voltage, the power control board switches the power supply to the dry battery, and after replacing the lithium battery pack, the power control board is restarted through the magnetically controlled switch to switch the power supply back to the lithium battery pack.

6. The multifunctional intelligent manhole cover monitoring terminal device according to claim 1 is characterized in that: The NB main control unit includes: The NB module is configured to upload power data, sensor data, and device data to the cloud platform; A positioning chip, which is positioned to locate the device; a memory chip configured to store sensor data; and A Bluetooth chip is configured to perform Bluetooth data transmission.

7. The multifunctional intelligent manhole cover monitoring terminal device according to claim 6 is characterized in that: Also includes: The antenna compartment is arranged outside the equipment cabin, and a NB antenna and a Bluetooth antenna are arranged in the antenna compartment, and the NB antenna and the Bluetooth antenna are connected to the NB main control unit.

8. The multifunctional intelligent manhole cover monitoring terminal device according to claim 1 is characterized in that: The sensor includes one or more of the following: a water level sensor configured to monitor a water level in the well; a methane sensor configured to monitor a methane gas concentration within the well; Magnetoresistive sensor; It is configured to monitor the state of the magnetic field to determine the opening and closing state of the manhole cover; as well as A tension sensor is connected to the debris collection bag, and the tension sensor is configured to measure the weight of the debris collection bag.

9. The multifunctional intelligent manhole cover monitoring terminal device according to claim 8, characterized in that: The water level sensor comprises: an electrode type water level sensor configured to monitor the water level in the well when the water level in the well is lower than the drainage pipe; and A submersible liquid level sensor is configured to monitor the water level in the well when the water level in the well is higher than the drainage pipe.

10. The multifunctional intelligent manhole cover monitoring terminal device according to claim 9, characterized in that: The electrode type water level sensor comprises: Stainless steel pipes with round or square cross-sections; A plurality of stainless steel studs are arranged at different lengths of the stainless steel pipe, wherein the stainless steel studs are covered with heat shrink tubing; and A signal line is wound around a stainless steel screw and fixed to the stainless steel stud via the stainless steel screw, wherein the signal line has a plurality of electrodes, and the plurality of electrodes are respectively arranged at a plurality of stainless steel studs.

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