A PLC monitoring and control device for pipeline water hammer monitoring and tracing

Abstract

This utility model proposes a PLC monitoring and control device for monitoring water hammer in pipelines. The device is characterized by being housed within a sealed enclosure, which includes a sensor module, a PLC data acquisition and processing unit, an early warning response module, a communication module, and a power supply module. The sensor module employs a stainless steel cylindrical probe or a probe structure with a standard threaded interface, connected to the PLC data acquisition unit via a high-pressure resistant conduit or a stainless steel armored cable. The probe of the sensor module integrates a pressure-sensitive element and is equipped with a shielded cable for signal output. The front of the sealed enclosure features an embedded touchscreen, multi-color LED indicator lights, a buzzer output port, and a communication interface. The sides / back of the enclosure have power input terminal blocks and sensor signal input interfaces. Inside the enclosure, the PLC data acquisition and processing unit integrates an ADC module, a signal conditioning circuit, and a vibration damping bracket.

Description

Technical Field

[0001] This utility model belongs to the field of measurement and control devices, and specifically relates to a PLC measurement and control device for monitoring and tracing water hammer in pipelines. Background Technology

[0002] Water hammer refers to pressure fluctuations in pipelines caused by rapid changes in water flow (such as quickly closing valves or starting pumps). These instantaneous high-pressure surges can severely damage pipeline systems and even cause pipe ruptures. Although devices for monitoring and controlling water hammer exist on the market, these devices generally suffer from insufficient monitoring accuracy, inaccurate source location, and limited environmental adaptability and anti-interference capabilities. Because water hammer is typically accompanied by instantaneous high-pressure surges, traditional monitoring equipment struggles to accurately capture these rapid changes, resulting in data that fails to accurately reflect the dynamic characteristics of water hammer. Furthermore, water hammer can occur at any location in long-distance water pipelines, and existing source tracing technologies struggle to pinpoint its exact location, affecting troubleshooting and maintenance efficiency. In addition, traditional water hammer testing devices are susceptible to external vibrations and other interference factors in laboratory or industrial settings, reducing the accuracy and repeatability of test data. Utility Model Content

[0003] This invention proposes a PLC-based monitoring and control device for monitoring and tracing water hammer in pipelines, addressing the problems of low monitoring accuracy, inaccurate tracing, and limited environmental adaptability and anti-interference capabilities in existing technologies. Through its innovative physical structure and high-protection design, this device improves the monitoring accuracy of water hammer phenomena and accurately traces the specific location of water hammer occurrence, thereby ensuring the safe and stable operation of pipeline systems and equipment.

[0004] The technical solution of this utility model is implemented as follows: A PLC monitoring and control device for monitoring water hammer in pipelines, characterized in that the PLC monitoring and control device is installed in a sealed enclosure, and the sealed enclosure includes a sensor module, a PLC data acquisition and processing unit, an early warning response module, a communication module and a power supply module.

[0005] The sensor module adopts a stainless steel cylindrical probe structure or a probe structure with a standard threaded interface, and is connected to the PLC data acquisition unit through a high-pressure resistant conductive tube or a stainless steel armored cable. The probe of the sensor module integrates a pressure-sensitive element and is equipped with a shielded cable for signal output. The front of the sealed chassis is equipped with an embedded touch screen, a multi-color LED indicator group, a buzzer sound hole, and a communication interface. The sides / back of the chassis are equipped with power input terminal blocks and sensor signal input interfaces. Inside the chassis, the PLC data acquisition and processing unit integrates an ADC module, a signal conditioning circuit, and a shock-absorbing bracket. The chassis mating surface is equipped with an annular silicone sealing ring, and the chassis is equipped with wall-mounting holes or guide rail slots. The early warning response module consists of a multi-color LED indicator group and a buzzer on the front of the chassis. The communication module has physical interfaces including an RJ45 Ethernet port, an RS485 terminal block, and an SMA-type 4G antenna interface. The power module has a built-in switching power supply and a backup power switching circuit.

[0006] This device solves the technical problems of existing pipeline water hammer monitoring equipment being susceptible to electromagnetic interference and physical vibration in complex industrial environments, resulting in inaccurate data acquisition, unstable communication, poor equipment reliability, weak adaptability to on-site installation, unintuitive status indication, and insufficient overall protection level.

[0007] Existing devices used for monitoring water hammer in pipelines typically face numerous severe challenges, the core of which lies in the difficulty of maintaining long-term, stable, reliable, and accurate operation in harsh industrial environments.

[0008] First, traditional monitoring equipment has significant deficiencies in its anti-interference capabilities. Industrial sites are filled with strong electromagnetic interference and conducted noise generated by various power equipment. These interferences can easily intrude into the system through signal transmission lines and power lines, contaminating the weak sensor signals, causing data acquisition distortion, frequent false alarms, and rendering the monitoring results worthless.

[0009] Secondly, existing devices lack sufficient environmental adaptability and mechanical reliability. Pipeline pressure monitoring points are often accompanied by strong mechanical vibrations. Such continuous or impact vibrations can damage delicate electronic components and connecting parts, shortening equipment lifespan. Furthermore, harsh environmental conditions such as wide temperature ranges, humidity, and dust place extremely high demands on the performance of components and the sealing and protection of the enclosure, which ordinary equipment cannot meet. Thirdly, ease of installation and maintenance is a major challenge. Many devices have loose structures, with sensors, acquisition units, and display units separated, leading to complex on-site wiring. This not only introduces more potential points of failure but also increases installation difficulty and maintenance costs, highlighting the lack of a highly integrated, unified solution.

[0010] Furthermore, the limitations of human-computer interaction and early warning methods cannot be ignored. On-site operators need to be able to quickly and intuitively grasp the system status, but traditional methods relying solely on text or single indicator lights have low visibility in noisy and poorly lit industrial environments, easily leading to misjudgments or delayed processing, and failing to provide an efficient and clear human-computer interaction experience. Finally, the reliability of the communication link is crucial for the timely uploading of data. A failure of a single communication interface can easily cause the entire system to become an information island, rendering remote monitoring meaningless.

[0011] The technical challenge addressed by this device is how to comprehensively address all the above challenges through innovation in hardware structure and physical design. Specifically, this includes how to achieve high-fidelity, interference-resistant acquisition and transmission of sensor signals within a limited space; how to design the enclosure structure and internal shock absorption to withstand strong vibrations and harsh environments; how to integrate multiple communication methods and ensure redundant backup of links; how to build an intuitive and efficient multi-mode early warning and indication system; and ultimately, how to compactly, rationally, and reliably integrate all these functional modules into a sealed enclosure to form a robust, stable, and maintenance-free integrated industrial measurement and control device.

[0012] This application document uses a PLC monitoring and control device for pipeline water hammer monitoring and tracing, the physical structure and core components of which are as follows:

[0013] (1) Sensor Module: The sensor module is a robust stainless steel cylinder or a probe structure with a standard threaded interface (such as G1 / 2" or NPT1 / 2"). It connects to subsequent units via a high-pressure, corrosion-resistant hard metal pressure-conducting tube or a stainless steel armored cable. Its core is an internally integrated industrial-grade pressure-sensitive element with a high sampling rate (≥500Hz) to meet the requirements for capturing transient waveforms caused by water hammer. The output interface supports 4-20mA / 0-10V dual-mode signals, transmitted via a dedicated shielded cable.

[0014] (2) PLC Data Acquisition Unit: The core is an industrial-standard metal chassis (usually made of iron or aluminum alloy), with a wear-resistant and corrosion-resistant coating (standard industrial gray). The front of the chassis is the human-machine interface center, clearly arranged with: an embedded fully laminated resistive touch screen (usually 5-7 inches), multi-state high-brightness LED indicator groups (red / yellow / green), a buzzer, a power switch and status indicator lights, and various communication interfaces (see Unit 6). The sides or back of the chassis have industrial-grade power input terminal blocks (with protective covers) and sensor signal input interfaces (M12 or aviation plug type). The chassis integrates a signal conditioning unit, whose visible external feature is the high-density industrial connectors (such as M12) with metal locking nuts on the side / back panel of the chassis, used to receive shielded cables from the sensors. This unit has a built-in high-precision, 24-bit analog-to-digital converter (ADC) module, whose high signal-to-noise ratio (≥110dB) design ensures the structural foundation for converting weak analog signals from sensors into high-quality digital signals. The chassis has a compact and robust overall structure and provides standardized wall mounting holes (such as M6 / M8) or rail slots for easy on-site deployment.

[0015] (3) Human-Machine Interaction Unit: Physically, this is the embedded LCD touchscreen display on the front of the core chassis. Multiple high-brightness, multi-color (red / yellow / green) LED status indicators and an industrial alarm buzzer are integrated on the top or side of the core chassis. This unit provides on-site operators with an intuitive interface for configuration, data display, and local status indication.

[0016] (4) Early Warning Response Unit: The physical implementation mainly relies on the LED indicator group and buzzer on the top or side of the chassis. When the internal processing unit identifies an anomaly based on a preset threshold and algorithm, the driving hardware causes a specific color LED (such as red) to flash at a high frequency, while the buzzer emits a rapid alarm sound. Its structural design ensures that the sound and light signals are clearly distinguishable in noisy industrial environments.

[0017] (5) Data communication unit: The physical interfaces are centrally and clearly arranged on the front or side panel of the core chassis, including:

[0018] Standard Ethernet port (RJ45 interface)

[0019] RS485 communication port with screw terminals

[0020] External antenna interface for 4G communication (SMA type)

[0021] These interfaces serve as the physical channels for transmitting real-time data (including pressure waveforms and alarm status) and positioning results between the equipment and the remote monitoring platform. Their multi-interface design inherently supports communication redundancy and backup.

[0022] (6) Power Supply and Protection Module: Externally visible is the industrial-grade power input terminal block (with overvoltage protection markings) on the chassis. The chassis adopts a sealed structure design, with key mating surfaces equipped with annular silicone seals to achieve a high protection level (IP65 or IP67), effectively resisting the intrusion of moisture and dust. The internal structure includes a fixedly installed industrial-grade switching power supply module (with surge suppression) and circuit board vibration damping brackets (such as silicone pillars or springs) to ensure continuous and stable power supply in a wide temperature range of -30℃ to 85℃ and vibration environments.

[0023] The touchscreen (human-computer interaction unit) in this device uses a fully laminated resistive touchscreen design. Its basic physical structure consists of a flexible thin film layer and a lower tempered glass substrate. Both adjacent surfaces are coated with a highly conductive and highly transparent ITO (indium tin oxide) coating. When the user touches the screen, the thin film is deformed under pressure, causing the lower ITO layer to contact the upper ITO layer on the glass substrate, generating a position signal. This signal is then converted by the on-screen controller to achieve precise touch control.

[0024] The alarm function (early warning response unit) in this device is physically represented by an LED indicator group and a buzzer on the top or side of the chassis. Its hardware driver circuit receives alarm commands from the processing unit, controls the LEDs to emit different colors (red - emergency, yellow - warning, green - normal) and flashing modes, and simultaneously drives the buzzer to emit sounds of different frequencies and durations, providing on-site personnel with intuitive and rapid indication of abnormal conditions.

[0025] Connection structure between units of the device:

[0026] Touch screen (human-computer interaction unit) and intelligent processing unit: directly and fixedly connected to the main control board through shielded ribbon cable or board-to-board connector inside the chassis, with no visible external connection cables, ensuring a clean and aesthetically pleasing front.

[0027] The high-frequency pressure sensing unit and signal conditioning unit are connected via a dedicated industrial anti-interference signal cable with a dense copper braided shield. Both ends of the cable use robust metal threaded connectors (such as M12) or aviation plugs, equipped with locking mechanisms to ensure a reliable and sealed connection. The shielding layer is grounded 360 degrees at the chassis entrance, forming the first level of anti-interference barrier.

[0028] Early warning response unit (LED / buzzer) and intelligent processing unit: connected to the optocoupler isolation or relay drive output terminal on the main control board via copper core wire harness inside the chassis.

[0029] Data communication unit interface: All communication interfaces (RJ45, RS485 terminal, 4G antenna port) are securely installed at the openings on the chassis panel. The interfaces themselves have certain electromagnetic shielding and electrical isolation characteristics (such as differential transmission of RS485 and transformer isolation of Ethernet), forming a second-level anti-interference mechanism.

[0030] Overall protection and anti-interference structural design of the device:

[0031] Chassis Sealing and Shielding: The all-metal chassis itself forms a Faraday cage effect, providing basic electromagnetic shielding. Combined with a sealed cover design and a waterproof and breathable valve (balancing air pressure), it achieves a high level of dust and water resistance (IP65 / IP67).

[0032] Shock-resistant and robust design: The internal circuit boards are secured with silicone shock-absorbing pads or spring brackets. Externally, sturdy metal mounting ears (with anti-loosening bolt holes) ensure stable operation of the equipment in vibrating environments.

[0033] Multi-level anti-interference architecture:

[0034] Physical layer: Sensor signal lines are fully shielded and reliably grounded.

[0035] Interface layer: Differential / isolation characteristics of communication interfaces (RS485 / Ethernet).

[0036] Chassis layer: Overall electromagnetic shielding and grounding of the metal casing.

[0037] Circuit layer (brief description): The internal signal processing circuit uses digital filtering technology as a supplement to hardware shielding to further filter out conducted interference.

[0038] The physical interface of the data communication unit in this device supports multiple remote transmission methods (4G, Ethernet, RS485 to fiber optic, etc.). Its hardware structure ensures that even in the event of a single link failure, a backup link can be automatically activated through an internal switching circuit to maintain data uploading.

[0039] The core function of this device—water hammer identification and tracing—relies on dedicated algorithm software embedded within the intelligent processing unit, running on its industrial-grade processor. This software utilizes Fast Fourier Transform (FFT) to analyze frequency domain characteristics and combines multi-point timestamp comparison technology for location calculation. The implementation of these technical principles is based on the aforementioned highly reliable hardware structure (such as high-speed ADC, precise clock, and robust connections).

[0040] This device, through its innovative structural and aesthetic design, particularly its high-protection-level sealed enclosure, industrial-grade interface layout and connections, intuitive local human-machine interface (touchscreen + LED + buzzer), and multi-layered physical anti-interference architecture, significantly improves long-term operational stability and reliability in harsh industrial environments such as high humidity, high dust, wide temperature variations, severe vibration, and strong electromagnetic interference. Simultaneously, the high-sampling-rate sensor and reliable signal transmission structure provide robust hardware support for achieving the core performance indicators of a water hammer pressure wave detection resolution of 0.01 MPa and a positioning error ≤ 0.5% of the total pipeline length. It provides a technologically advanced and robust monitoring and control device for the safe operation and maintenance of long-distance pipelines.

[0041] In a preferred embodiment, the PLC data acquisition and processing unit is connected to the sensor module via a high-pressure resistant tube or a stainless steel armored cable, and integrates a 24-bit ADC module, signal conditioning circuit and shock absorption structure. It also has a built-in industrial-grade processor for running water hammer identification algorithms.

[0042] In a preferred embodiment, the RS485 interface of the communication module adopts a differential transmission structure, the Ethernet interface adopts a transformer isolation structure, and has a built-in link switching circuit.

[0043] In a preferred embodiment, the sensor module and the PLC data acquisition and processing unit are connected by a fully shielded signal cable. The cable is equipped with metal threaded connectors and locking mechanisms at both ends, and the shielding layer is grounded at the chassis entrance.

[0044] In a preferred embodiment, the chassis is a metal-sealed structure, the shielding layer of the fully shielded signal cable is grounded, and the communication interface adopts a differential or isolation design.

[0045] In a preferred embodiment, the multi-color LED indicator group includes three colors: red, yellow, and green, and the buzzer is connected to the main control board via optocoupler isolation or a relay.

[0046] After adopting the above technical solution, the beneficial effects of this utility model are:

[0047] 1. High real-time performance and rapid response: The system adopts millisecond-level data acquisition and high-precision sensors, enabling it to capture instantaneous high-pressure pulses from water hammer in a very short time, achieving millisecond-level alarm response and significantly shortening fault handling time.

[0048] 2. High monitoring accuracy and accurate anomaly identification: Through digital filtering, FFT and wavelet transform algorithms, the key features of water hammer signals can be accurately extracted, reducing the false alarm and missed alarm rates caused by background noise and external interference, and ensuring that alarms are triggered only in truly abnormal conditions.

[0049] 3. Strong multi-point source tracing and location capabilities: By utilizing the synchronous uploading of data from multiple monitoring points and time difference comparison technology, the propagation path of water hammer waves within the pipeline is reconstructed, enabling precise location of the fault source. This provides a scientific basis for future maintenance work and effectively reduces the consequences of accidents.

[0050] 4. Stable data transmission and timely early warning: The use of multi-redundant communication technology ensures stable data transmission even in harsh environments. Real-time feedback is provided through a remote monitoring platform to ensure that the operational status of each node in the pipeline network is always under control, providing accurate information for emergency dispatch.

[0051] 5. The system is adaptable to harsh industrial environments. Its industrial-grade power supply, anti-interference design, waterproof and dustproof housing, and shock-resistant structure enable the device to operate stably in environments with high temperature, humidity, high dust, and severe electromagnetic interference, making it widely applicable.

[0052] 6. Scalability and Software Functionality: The system has built-in large-capacity storage and detection algorithms. After data accumulation, it can perform statistical analysis on the occurrence patterns of water hammer events, which is conducive to further realizing preventive maintenance and dynamic threshold adaptive adjustment, and promotes the transformation of pipeline networks from passive alarm to proactive prediction. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is the wiring circuit diagram for the power module of this utility model;

[0055] Figure 2 This is a circuit connection diagram of the PLC data acquisition and processing unit of this utility model;

[0056] Figure 3 This is the transmission circuit diagram of the sensor module of this utility model;

[0057] Figure 4 This is the wiring circuit diagram for the touch screen of this utility model;

[0058] Figure 5 This is the terminal wiring diagram for this utility model. Detailed Implementation

[0059] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0060] Example:

[0061] like Figure 1 As shown, a PLC monitoring and control device for monitoring water hammer in pipelines is characterized in that the PLC monitoring and control device is installed in a sealed enclosure, and the sealed enclosure includes a sensor module, a PLC data acquisition and processing unit, an early warning response module, a communication module and a power supply module.

[0062] The sensor module adopts a stainless steel cylindrical probe structure or a probe structure with a standard threaded interface, and is connected to the PLC data acquisition unit through a high-pressure resistant conductive tube or a stainless steel armored cable. The probe of the sensor module integrates a pressure-sensitive element and is equipped with a shielded cable for signal output. The front of the sealed chassis is equipped with an embedded touch screen, a multi-color LED indicator group, a buzzer sound hole, and a communication interface. The sides / back of the chassis are equipped with power input terminal blocks and sensor signal input interfaces. Inside the chassis, the PLC data acquisition and processing unit integrates an ADC module, a signal conditioning circuit, and a shock-absorbing bracket. The chassis mating surface is equipped with an annular silicone sealing ring, and the chassis is equipped with wall-mounting holes or guide rail slots. The early warning response module consists of a multi-color LED indicator group and a buzzer on the front of the chassis. The communication module has physical interfaces including an RJ45 Ethernet port, an RS485 terminal block, and an SMA-type 4G antenna interface. The power module has a built-in switching power supply and a backup power switching circuit.

[0063] The system composition and installation of application scenarios in urban water supply systems are as follows:

[0064] High-precision sensors are deployed at key nodes in the urban water supply network (such as main water supply lines, bends, interfaces, and distributors). The specific plan is as follows:

[0065] 1. Sensor deployment: On the main water supply pipeline, a set of sensors is deployed every 100 to 200 meters. Each set includes: Pressure sensor: a sensor with a response time of less than 5 milliseconds and a sampling rate of more than 500Hz;

[0066] 2. PLC main controller layout: A central PLC is set up in the control center, and distributed small PLC units are equipped at important nodes. These distributed units send data to the central PLC via RS485 or Modbus TCP.

[0067] 3. Communication System: 4G / Ethernet redundant communication equipment is installed in the control room to ensure that data from each node can be uploaded to the monitoring platform in real time, and data transmission security is ensured through encryption protocols.

[0068] 4. Local display and alarm facilities: The control center is equipped with a large-size LCD touch screen to display the entire network data, pressure waveforms and alarm information in real time. It is also equipped with audible and visual alarms to ensure timely response by on-site operators.

[0069] 1.2 Software and Control Flow

[0070] The PLC program is divided into the following five modules: 1. Data Acquisition Module: Pressure (flow rate and temperature, if applicable) data are acquired in real time according to a set sampling period (20ms or less), and preliminary amplification and anti-interference processing are performed. 2. Digital Filtering Module: The acquired data is low-pass and band-pass filtered to remove frequency interference and retain high-frequency abrupt signals. 3. Feature Extraction Module: Using FFT and water hammer detection algorithms, the acquired data is converted between the time and frequency domains to extract the unique rapid amplitude changes, rise time, and spectral changes characteristic of water hammer. 4. Anomaly Detection and Alarm Module: When the characteristic parameters exceed the preset threshold, the system automatically determines it as a water hammer anomaly, immediately triggering LED and buzzer alarms locally, and simultaneously recording complete data before and after the anomaly. 5. Source Tracing and Location Module: After multi-point data is synchronized with precise timestamps, the PLC internally compares and calculates using a propagation model to automatically locate the fault source and generate a fault report to be sent to the monitoring platform.

[0071] The system installation and integration for a low-pressure pipeline water conveyance irrigation area network monitoring scenario are as follows:

[0072] In irrigation district networks, pipeline systems traverse vast farmlands and are influenced by multiple natural factors such as topography and climate, placing higher demands on precise regulation and long-term stable operation.

[0073] Core monitoring points are deployed in key areas (such as water outlets, critical valves, and pump station inlets and outlets) and equipped with high-precision sensor combinations to monitor multiple key parameters such as flow rate, pressure, and water level in real time, ensuring multi-dimensional data acquisition.

[0074] Centralized control and data aggregation transmit data collected by monitoring nodes distributed in various areas at high speed to the central PLC or SCADA platform via fiber optic, industrial Ethernet or wireless network, enabling unified scheduling and real-time processing.

[0075] To adapt to the ever-changing outdoor environment, the system is designed with a waterproof and dustproof casing and is equipped with an independent UPS power supply to ensure that the critical monitoring system continues to operate stably in the event of severe weather or external power outage.

[0076] During system operation and emergency response, sudden abnormal situations such as water hammer, pipeline leakage, or valve malfunction often occur during irrigation district operation. The system has the following functions:

[0077] Real-time early warning and linkage: When the system detects water hammer, abnormal pressure, or other faults, it not only immediately issues a local alarm signal but also automatically synchronizes the information to the irrigation district command center and triggers linkage measures (such as automatically adjusting control valves and starting backup water pumps). Data storage and event tracking system: Each abnormal event is automatically archived. Engineers can compare historical data to track changes in various parameters before and after an event, providing a scientific basis for accident investigation and prevention measures. Remote monitoring and pre-diagnosis: Relying on a remote monitoring platform, experts can view the pipeline network status in real time, perform remote fault diagnosis, and issue early warnings before abnormal events occur, achieving pre-diagnosis and rapid response.

[0078] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A PLC monitoring and control device for monitoring and tracing water hammer in pipelines, characterized in that, The PLC measurement and control device is installed in a sealed enclosure, which contains a sensor module, a PLC data acquisition and processing unit, an early warning response module, a communication module, and a power supply module. The sensor module adopts a stainless steel cylindrical probe structure or a probe structure with a standard threaded interface, and is connected to the PLC data acquisition unit through a high-pressure resistant conductive tube or a stainless steel armored cable. The probe of the sensor module integrates a pressure-sensitive element and is equipped with a shielded cable for signal output. The front of the sealed chassis is equipped with an embedded touch screen, a multi-color LED indicator group, a buzzer sound hole, and a communication interface. The sides / back of the chassis are equipped with power input terminal blocks and sensor signal input interfaces. Inside the chassis, the PLC data acquisition and processing unit integrates an ADC module, a signal conditioning circuit, and a shock-absorbing bracket. The chassis mating surface is equipped with an annular silicone sealing ring, and the chassis is equipped with wall-mounting holes or guide rail slots. The early warning response module consists of a multi-color LED indicator group and a buzzer on the front of the chassis. The communication module has physical interfaces including an RJ45 Ethernet port, an RS485 terminal block, and an SMA-type 4G antenna interface. The power module has a built-in switching power supply and a backup power switching circuit.

2. The PLC monitoring and control device for pipeline water hammer monitoring and tracing as described in claim 1, characterized in that: The PLC data acquisition and processing unit is connected to the sensor module via a high-pressure resistant tube or a stainless steel armored cable, and integrates a 24-bit ADC module, signal conditioning circuit and shock absorption structure. It also has a built-in industrial-grade processor for running water hammer identification algorithms.

3. The PLC monitoring and control device for pipeline water hammer monitoring and tracing as described in claim 1, characterized in that: The communication module's RS485 interface adopts a differential transmission structure, its Ethernet interface adopts a transformer isolation structure, and it has a built-in link switching circuit.

4. The PLC monitoring and control device for pipeline water hammer monitoring and tracing as described in claim 1, characterized in that: The sensor module and the PLC data acquisition and processing unit are connected by a fully shielded signal cable. The cable is equipped with metal threaded connectors and locking mechanisms at both ends, and the shielding layer is grounded at the entrance of the chassis.

5. The PLC monitoring and control device for pipeline water hammer monitoring and tracing as described in claim 4, characterized in that: The chassis is a sealed metal structure, the shielding layer of the fully shielded signal cable is grounded, and the communication interface adopts a differential or isolation design.

6. The PLC monitoring and control device for pipeline water hammer monitoring and tracing as described in claim 1, characterized in that: The multi-color LED indicator group includes three colors: red, yellow, and green. The buzzer is connected to the main control board via optocoupler isolation or a relay.

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