Well lid displacement monitor

Abstract

The utility model relates to a well lid displacement monitor, which comprises a signal acquisition and processing unit, a main control chip, a communication module and a power supply unit, the signal acquisition and processing unit comprises a LIS3DHTR triaxial accelerometer and a displacement sensor which are connected with the input end of the main control chip, the main control chip comprises an FM33LC025 processing chip, and the FM33LC025 processing chip is connected with the communication module. The SCLK function pin, the MOSI function pin, the MISO function pin and the SSN function pin of the LIS3DHTR triaxial accelerometer are connected with the SPI interface pin group corresponding to the input end of the FM33LC025 processing chip through a full duplex 4 line, and the INT1 function pin and the INT2 function pin of the LIS3DHTR triaxial accelerometer are connected with the LS3DH interface pin group corresponding to the input end of the FM33LC025 processing chip through an interrupt line. According to the well lid displacement monitor, accurate collection of well lid postures is achieved, the abnormal state can be judged and actively reported, false alarm of the displacement sensor is avoided, and the overall power consumption of equipment and the later maintenance cost are reduced in cooperation with operation mode control of the master control.

Description

Technical Field

[0001] The utility model relates to the technical field of smart city terminal sensors and Internet of Things communications, and in particular to a manhole cover displacement monitor. Background Art

[0002] As one of the key factors of the urban infrastructure drainage system, manhole covers are widely distributed and have many safety issues. Since the workload of manpower investigation and supervision is huge, the intelligent monitoring system for manhole covers has become an important part of building a smart city. The application of the manhole cover intelligent monitoring system can greatly improve the reliability and safety of the manhole covers of the urban infrastructure drainage system, while reducing maintenance costs and improving work efficiency.

[0003] The manhole cover intelligent monitoring system consists of a manhole cover monitor installed on the manhole cover as a field terminal and an IoT cloud platform as a background that communicates with the manhole cover monitor. The IoT cloud platform is used to implement monitoring settings, information and alarm reception, work order processing, message push and other functions; the manhole cover monitor is used to collect and upload field information corresponding to the manhole cover location. The manhole cover monitor can integrate multiple functions, such as real-time monitoring of the manhole cover tilt state, displacement, temperature and other conditions, and also has extended functions such as arming and disarming, alarm prompts, and battery power monitoring.

[0004] The existing manhole cover displacement monitoring device using traditional displacement sensors has the following problems:

[0005] (1) It is impossible to monitor the displacement data of the manhole cover in real time and actively upload the data when the manhole cover status is abnormal;

[0006] (2) The manhole cover posture detection signal is inaccurate;

[0007] (3) Relying solely on the displacement sensor to improve its sensitivity may easily lead to false alarms. Utility Model Content

[0008] The technical problem to be solved by the utility model is: to provide a manhole cover displacement monitor, which independently powers the acquisition unit for real-time signal input, and adds a LIS3DHTR three-axis accelerometer to cooperate with the displacement sensor, thereby realizing accurate acquisition of the manhole cover posture, and being able to judge and actively report abnormal conditions, avoiding false alarms of the displacement sensor, and cooperating with the operation mode control of the main control to reduce the overall power consumption of the equipment and the subsequent maintenance costs.

[0009] The manhole cover displacement monitor includes a signal acquisition and processing unit for acquiring displacement signals at the manhole cover where the monitor is located, as well as a main control chip, a communication module and a power supply unit. The signal acquisition and processing unit and the communication module are respectively connected to the signal input and output ends of the main control chip, and the power supply unit supplies power to the acquisition and processing unit, the main control chip and the communication module respectively. The signal acquisition and processing unit includes a LIS3DHTR three-axis accelerometer and a displacement sensor connected to the input end of the main control chip, and the main control chip includes an FM33LC025 processing chip. The SCLK, MOSI, MISO, and SSN function pins of the LIS3DHTR three-axis accelerometer are connected to the SPI interface pin group corresponding to the input end of the FM33LC025 processing chip through full-duplex 4-wires, and the INT1 and INT2 function pins of the LIS3DHTR three-axis accelerometer are connected to the LS3DH interface pin group corresponding to the input end of the FM33LC025 processing chip through interrupt lines.

[0010] Specifically, the communication module adopts the EC800E wireless transparent transmission module.

[0011] Specifically, the power supply unit includes a battery, a power access terminal, a power circuit and a power detection module; the battery adopts an ER18505+RHC1530-3.6V lithium battery, and the battery is connected to the power supply end of the LIS3DHTR three-axis accelerometer, the main control chip and the communication module respectively through the power access terminal and the power circuit, and the signal input and output ends of the power detection module are respectively connected to the battery and the main control chip.

[0012] The optimization further includes a buzzer and a vibration module installed on the monitor housing, and the buzzer and the vibration module are both connected to the control output terminal of the main control chip.

[0013] The utility model discloses a manhole cover displacement monitor, which independently supplies power to the acquisition unit for real-time signal input, and adds a LIS3DHTR three-axis accelerometer to cooperate with the displacement sensor, thereby realizing accurate acquisition of the manhole cover posture, and being able to judge and actively report abnormal states, thus avoiding false alarms of the displacement sensor, and cooperating with the operation mode control of the main control, reducing the overall power consumption of the equipment and the subsequent maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following is a further description of the manhole cover displacement monitor of the utility model in conjunction with the accompanying drawings:

[0015] Figure 1 This is the logic structure and connection principle wireframe diagram of the manhole cover displacement monitor;

[0016] Figure 2 This is the circuit diagram of the main control chip of the manhole cover displacement monitor;

[0017] Figure 3 It is a circuit diagram of the signal acquisition and processing unit of the manhole cover displacement monitor.

[0018] In the figure:

[0019] 1-Signal acquisition and processing unit, 2-Main control chip, 3-Communication module, 4-Power supply unit, 5-Buzzer, 6-Vibration module;

[0020] 11-LIS3DHTR three-axis accelerometer, 12-displacement sensor; 21-FM33LC025 processing chip; 41-battery, 42-power access terminal, 43-power circuit, 44-power detection module. DETAILED DESCRIPTION

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the description of the present invention, it should be understood that the terms "left", "right", "front", "back", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] The technical solution of the utility model is further described below with specific embodiments, but the protection scope of the utility model is not limited to the following embodiments.

[0024] Implementation method 1: Figures 1 to 3As shown, the manhole cover displacement monitor includes a signal acquisition and processing unit 1 for acquiring displacement signals at the manhole cover where the monitor is located, as well as a main control chip 2, a communication module 3 and a power supply unit 4. The signal acquisition and processing unit 1 and the communication module 3 are respectively connected to the signal input and output ends of the main control chip 2, and the power supply unit 4 supplies power to the acquisition and processing unit 1, the main control chip 2 and the communication module 3 respectively. The signal acquisition and processing unit 1 includes a LIS3DHTR three-axis accelerometer 11 and a displacement sensor 12 connected to the input end of the main control chip 2, and the main control chip 2 includes a FM33LC025 processing chip 21. The SCLK, MOSI, MISO, and SSN function pins of the LIS3DHTR three-axis accelerometer 11 are connected to the SPI interface pin group corresponding to the input end of the FM33LC025 processing chip through full-duplex 4-wires, and the INT1 and INT2 function pins of the LIS3DHTR three-axis accelerometer 11 are connected to the LS3DH interface pin group corresponding to the input end of the FM33LC025 processing chip through interrupt lines. The LIS3DHTR three-axis accelerometer is powered separately. It can collect the displacement and attitude signals of the manhole cover in real time, and continuously send them to the FM33LC025 processing chip through the full-duplex 4-wire and LIS3DH dual interrupt lines. While ensuring the continuous acquisition of displacement signals and the expansion of attitude signal functions, it maintains the accurate and stable transmission of multiple signals. The FM33LC025 processing chip is based on the ARMCortex-M0 core, and the configurable working modes are LPRUN mode, Sleep mode and Deepsleep mode; at 32KHz, LPRUN power consumption is 30uA / Sleep mode 6uA / Deepsleep mode, RTC timekeeping + all RAM retention + CPU core retention 1uA. In conjunction with the single-phase signal acquisition and processing, the main control chip is in a low-power sleep mode under normal conditions, and only drives the communication module to report data several times a day according to the setting. When the input signal exceeds the preset value range, it enters the working mode and wakes up the communication module to fully operate, and performs real-time data upload.

[0025] Implementation method 2: The communication module 3 of this manhole cover displacement monitor adopts the EC800E wireless transparent transmission module. This module has a single-phase coordination with the signal acquisition and processing and is compatible with the main control module, and has a normal sleep mode / it enters the working condition only when the operation signal and the communication data signal are obtained. The power supply unit 4 includes a battery 41, a power access terminal 42, a power circuit 43 and a power detection module 44; the battery 41 adopts an ER18505+RHC1530-3.6V lithium battery, and the battery 41 is connected to the LIS3DHTR three-axis accelerometer 11, the main control chip 2 and the power supply end of the communication module 3 through the power access terminal 42 and the power circuit 43, and the signal input and output ends of the power detection module 44 are respectively connected to the battery 41 and the main control chip 2. The standard charging capacity of the lithium battery is 8000mAh. In the low energy consumption state, it can be installed once and used all year round. Its voltage signal will be passively collected by the power detection module and uploaded to the IoT background through the main control chip and communication module. The voltage value can be converted into the real-time power consumption of the manhole cover monitor, and the battery life can be predicted according to the voltage change rate. The remaining structures and components are as described in Implementation 1 and will not be described again.

[0026] Implementation 3: The manhole cover displacement monitor also includes a buzzer 5 and a vibration module 6 installed on the monitor housing, and the buzzer 5 and the vibration module 6 are connected to the control output end of the main control chip 2. It is used to make sound and vibration alarms according to the downlink control signal of the Internet of Things platform in the disarmed state. The remaining structures and components are as described in Implementation 1 and will not be described again.

[0027] During operation: When the manhole cover monitor is powered on, the main control chip LIS3DHTR three-axis accelerometer and FM33LC025 processing chip are running. The FM33LC025 processing chip reads the current data of the LIS3DHTR three-axis accelerometer and uploads it. After deployment, the FM33LC025 processing chip is in a dormant state in most cases except for setting a scheduled upload; while the LIS3DHTR three-axis accelerometer is in a state of direct battery power supply. When the state of the manhole cover changes, the state of the connected LIS3DHTR three-axis accelerometer also changes accordingly, which will interrupt the FM33LC025 processing chip. The FM33LC025 processing chip will then perform interrupt processing. After judging that the displacement degree reaches the set alarm requirements, it will upload the data to the background, thereby realizing real-time abnormal monitoring of the manhole cover displacement. After multiple interrupt judgments, the FM33LC025 processing chip reads the displacement chip information. After reading that the actual displacement value is greater than or equal to the set value, the communication module is driven to enter the working condition upload platform to send an alarm instruction, thereby reducing false alarms.

[0028] This manhole cover displacement monitor independently powers the acquisition unit for real-time signal input, and adds a LIS3DHTR three-axis accelerometer to cooperate with the displacement sensor, which realizes the accurate acquisition of the manhole cover posture, and can judge and actively report abnormal conditions, avoiding false alarms of the displacement sensor, and cooperating with the operating mode control of the main control to reduce the overall power consumption of the equipment and subsequent maintenance costs.

[0029] The above description shows the main features, basic principles, and advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments or embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, the above embodiments or embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the utility model. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A manhole cover displacement monitor, characterized in that: it includes a A signal acquisition and processing unit (1) for acquiring displacement signals at a manhole cover where a monitor is located, as well as a main control chip (2), a communication module (3) and a power supply unit (4), wherein the signal acquisition and processing unit (1) and the communication module (3) are respectively connected to the signal input and output ends of the main control chip (2), and the power supply unit (4) respectively supplies power to the acquisition and processing unit (1), the main control chip (2) and the communication module (3), wherein the signal acquisition and processing unit (1) comprises a LIS3DHTR three-axis accelerometer (11) connected to the input end of the main control chip (2). and a displacement sensor (12), the main control chip (2) comprising an FM33LC025 processing chip (21), the SCLK, MOSI, MISO, and SSN function pins of the LIS3DHTR three-axis accelerometer (11) being connected to an SPI interface pin group corresponding to an input end of the FM33LC025 processing chip via full-duplex 4-wires, and the INT1 and INT2 function pins of the LIS3DHTR three-axis accelerometer (11) being connected to an LS3DH interface pin group corresponding to an input end of the FM33LC025 processing chip via interrupt lines.

2. The manhole cover displacement monitor according to claim 1 is characterized in that: The communication module (3) adopts an EC800E wireless transparent transmission module.

3. The manhole cover displacement monitor according to claim 2 is characterized in that: The power supply unit (4) comprises a battery (41), a power supply access terminal (42), a power supply circuit (43) and a power supply detection module (44); the battery (41) is an ER18505+RHC1530-3.6V lithium battery; the battery (41) is respectively connected to the power supply end of the LIS3DHTR three-axis accelerometer (11), the main control chip (2) and the communication module (3) through the power supply access terminal (42) and the power supply circuit (43); the signal input and output ends of the power supply detection module (44) are respectively connected to the battery (41) and the main control chip (2).

4. The manhole cover displacement monitor according to claim 3 is characterized in that: It also includes a buzzer (5) and a vibration module (6) installed on the monitor housing, and the buzzer (5) and the vibration module (6) are both connected to the control output end of the main control chip (2).

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