Integrated detection system of mining intrinsically safe multi-parameter sensor

Abstract

The invention belongs to the technical field of coal mine safety monitoring, and particularly relates to an integrated detection system of a mining intrinsically safe multi-parameter sensor, which comprises four core parts, namely a parameter detection module, a signal processing module, an intrinsically safe power supply module and a communication module, wherein the parameter detection module integrates a plurality of parameter detection modules and is in communication connection with the signal processing module; the signal processing module collects electric signals output by the detection modules, and mutual interference among parameters is eliminated by means of a preset multi-parameter cross interference compensation algorithm. According to a preset time-sharing power supply strategy, the intrinsic safety power supply module implements periodic polling power-on on each detection module; and the communication module is responsible for receiving and sending the processed electric signal, calling a dynamic impedance matching technology in a transmission process, carrying out adaptive adjustment on signal transmission, and ensuring stable operation of the system. According to the invention, the problems of low multi-parameter integration level and poor long-distance transmission reliability of the existing mining intrinsically safe sensor can be solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal mine safety monitoring, and particularly relates to an integrated detection system of a mine-used intrinsically safe multi-parameter sensor. BACKGROUND

[0002] In the process of coal mine underground production, safety risks such as water damage, gas explosion, equipment failure, etc. threaten the life safety of operating personnel and the property safety of the mine at all times, among which, the turbidity, conductivity, pH value and environmental temperature of the underground water body are the key indicators reflecting the water quality condition, equipment operation state and potential safety hidden danger.

[0003] At present, the detection of the above-mentioned multi-parameters in the coal mine underground mainly relies on the traditional single parameter sensor combination scheme, which realizes multi-parameter coverage by respectively deploying independent detection equipment, such as the turbidity detection which mainly uses special turbidity sensors such as HACH TU5 series to realize turbidity measurement based on light scattering principle; the conductivity detection which relies on conductivity meters such as YSI EC300 to obtain conductivity data through electrode excitation method; the pH value monitoring which selects professional pH meters such as Mettler S400 to realize measurement by using the ion selectivity response of glass electrode; the temperature detection which separately configures thermocouple or thermistor probe; each equipment is connected with the underground monitoring substation through independent signal cable, data transmission generally uses RS485 communication protocol, and power supply relies on the underground special DC power module.

[0004] However, with the continuous improvement of the requirements of coal mine intelligentization and intrinsically safe, the limitations of the traditional scheme are increasingly prominent, which has been difficult to meet the efficient and safe monitoring needs of modern mines, and the main defects are concentrated in the following aspects: 1. Function dispersion and equipment redundancy defect: the core problem of the traditional scheme is the dispersed design of "one parameter one equipment", which leads to the need to install multiple independent sensors and supporting signal processing and communication modules in the underground; at the same time, the dispersed equipment layout increases the maintenance workload, and single point fault diagnosis, regular calibration and other operations need to be carried out for each equipment, and the maintenance cost is increased by more than 40% compared with the integrated scheme; more importantly, the increase of the number of equipment and cables directly increases the number of electrical connection points, and the problems of poor contact of connection points, insulation aging, etc. are easy to cause electric spark, which significantly increases the explosion risk in the combustible and explosive environment of the coal mine underground, which is in fundamental conflict with the requirement of intrinsic safety.

[0005] 2. Insufficient Transmission Performance and Intrinsic Safety Conflict: Existing solutions generally use the conventional RS485 communication protocol for data transmission. However, due to environmental factors such as long underground mine roadways, strong electromagnetic interference, and high cable loss, transmission performance is difficult to guarantee. According to verification data from MT / T 210-1990 "General Technical Conditions for Electrical and Electronic Products for Communication, Detection, and Control in Coal Mines," the conventional RS485 solution experiences a signal attenuation rate exceeding 30% and a bit error rate exceeding [missing information] at a transmission distance of 2km. This exceeds the reliability threshold specified in the standard. To address this issue, existing technologies often employ the addition of repeaters to amplify the signal and extend the transmission distance. However, the addition of repeaters not only increases equipment redundancy and maintenance costs, but more importantly, their electrical circuit design is difficult to fully meet the power limitations and explosion-proof requirements of intrinsically safe equipment in coal mines, easily becoming a new safety hazard and contradicting the design principle of "intrinsically safe first" in underground coal mines. Summary of the Invention

[0006] The technical problem solved by this invention is to provide an integrated detection system for an intrinsically safe multi-parameter sensor for mining, so as to solve the problems of low multi-parameter integration and poor long-distance transmission reliability of existing intrinsically safe sensors for mining.

[0007] The basic solution provided by this invention is an integrated detection system for intrinsically safe multi-parameter sensors used in mining, comprising a parameter detection module, a signal processing module, an intrinsically safe power supply module, and a communication module, wherein: The parameter detection module is communicatively connected to the signal processing module. The parameter detection module integrates several parameter detection modules. The signal processing module is used to collect the electrical signals output by each parameter detection module in the parameter detection module and eliminate mutual interference between different parameters based on a preset multi-parameter cross-interference compensation algorithm. The intrinsically safe power module is used to periodically poll and power on each parameter detection module in the parameter detection module based on a preset time-sharing power supply strategy; The communication module is used to receive and send electrical signals from the parameter detection modules after processing by the signal processing module, and to adjust the signal transmission by calling a preset dynamic impedance matching technology during the reception and transmission of electrical signals.

[0008] Furthermore, the preset multi-parameter cross-interference compensation algorithm expression is as follows:

[0009] in, This represents the corrected output value. The original measured value of the i-th parameter. Let be the sensitivity coefficient of the i-th parameter. This represents the interference coefficient of the j-th parameter on the i-th parameter. This is the system error correction value.

[0010] Furthermore, the parameter detection module includes a turbidity detection module, a conductivity module, a pH value module, and a temperature module. The turbidity module, after being calibrated based on a preset value, collects the turbidity signal of the liquid in the mine and transmits it to the signal processing module. The conductivity module adopts a four-electrode structure to measure the conductivity signal of the liquid in the mine and transmit it to the signal processing module. The pH module uses a glass pH electrode and a temperature sensor to transmit the potential difference and temperature signals output by the glass pH electrode to the signal processing module; the signal processing module calculates the pH value by calling a temperature compensation algorithm based on the received potential difference and temperature signals. The temperature module is used to collect temperature signals inside the mine and transmit them to the signal processing module.

[0011] Furthermore, the intrinsically safe power module includes a power supply unit and a power supply control unit. The power supply control unit has a preset time-sharing power supply strategy and controls the power supply unit to supply power to each parameter detection module in the parameter detection module according to the time-sharing power supply strategy based on the MOSFET switching circuit.

[0012] Furthermore, the preset time-sharing power supply strategy is as follows: Based on the operating voltage requirements of different parameter detection modules, an adjustable voltage range value is output through a DC-DC conversion module, and power supply voltage compensation is performed according to the health status of the parameter detection modules; the expression is:

[0013] in, This represents the adjustable voltage range value of the i-th parameter detection module; This represents the rated voltage of the i-th parameter detection module; This indicates the health status of the i-th parameter detection module; Based on the amount of data generated by the parameter detection module, the drive current of the parameter detection module is supplied on demand; the expression is:

[0014] in, Indicates the drive current value. Indicates the basic drive current. Indicates the amount of task data. This indicates the maximum data size per frame.

[0015] Furthermore, the communication module includes a receiving unit, a transmitting unit, and a dynamic impedance matching unit. The receiving unit receives electrical signals from various parameter detection modules after processing by the signal processing module. The transmitting unit transmits the electrical signals to the ground server. The dynamic impedance matching unit periodically sends a sweep frequency signal based on the impedance matching network, determines the change in cable characteristic impedance by detecting the signal attenuation rate, and adjusts the drive current according to the detected signal attenuation rate. The expression is:

[0016] in, Represents frequency Signal attenuation rate at the following levels Represents frequency The output signal voltage is below. Represents frequency The input signal voltage.

[0017] Furthermore, it also includes a composite explosion-proof enclosure, which is made of Q235A steel plate, with an epoxy antistatic coating on the surface, an internal polycarbonate insulation layer, and internal electrical clearances. creepage distance .

[0018] The principles and advantages of this invention are as follows: In this application, the parameter detection module achieves synchronous acquisition of multiple parameters through integrated multiple parameter detection modules. After communicating with the signal processing module, the signal processing module acquires the electrical signals output by each module and uses a preset multi-parameter cross-interference compensation algorithm to eliminate mutual interference between parameters based on the original measured values, combined with sensitivity coefficient, interference coefficient, and system error correction value. The intrinsically safe power supply module relies on a preset time-sharing power supply strategy to periodically poll and power on each parameter detection module through a MOSFET switching circuit, avoiding excessive power consumption caused by multiple modules working simultaneously. When receiving and sending the processed electrical signals, the communication module periodically sends a sweep frequency signal using dynamic impedance matching technology, calculates the signal attenuation rate, and then automatically adjusts the drive current according to the attenuation rate to ensure stable signal transmission.

[0019] The technical benefits are as follows: the integrated design of the parameter detection module reduces the number of underground equipment installations and wiring complexity; combined with the multi-parameter cross-interference compensation algorithm of the signal processing unit, it effectively improves the accuracy of each parameter detection; the time-sharing power supply strategy of the intrinsically safe power module controls the total power consumption at a low level, meeting the power consumption requirements of intrinsic safety in coal mines; the dynamic impedance matching technology of the communication module solves the problem of severe signal attenuation in traditional transmission, ensuring signal stability and low bit error rate during long-distance transmission; the overall system achieves the synergistic effect of accurate multi-parameter detection, low-power safe power supply, and reliable communication, reducing the maintenance cost and safety risks of underground monitoring in coal mines. Attached Figure Description

[0020] Figure 1 This is a functional block diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the system hardware structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the power management circuit according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a signal transmission impedance matching circuit according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the composite explosion-proof shell structure according to an embodiment of the present invention. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method: The implementation examples are basically as follows Figure 1 and Figure 2 As shown: An integrated detection system for intrinsically safe multi-parameter sensors used in mining includes a composite explosion-proof housing, a parameter detection module, a signal processing module, an intrinsically safe power supply module, and a communication module. Among these, for example... Figure 5 As shown, the composite explosion-proof enclosure is made of 3mm thick Q235A steel plate, with an epoxy antistatic coating sprayed on the surface to prevent static electricity buildup from causing an explosion; the interior of the composite explosion-proof enclosure has a polycarbonate insulation layer to protect electrical clearances. creepage distance To prevent electrical sparks, the composite explosion-proof housing uses a silicone O-ring combined with a labyrinth structure for sealing, achieving an IP65 protection rating and preventing dust and water from entering the equipment.

[0022] The parameter detection module, signal processing module, intrinsically safe power supply module, and communication module are all located inside the composite explosion-proof enclosure. The parameter detection module is communicatively connected to the signal processing module. The parameter detection module integrates several parameter detection modules. The signal processing module is used to collect the electrical signals output by each parameter detection module in the parameter detection module and eliminate mutual interference between different parameters based on a preset multi-parameter cross-interference compensation algorithm. The preset multi-parameter cross-interference compensation algorithm expression is as follows:

[0023] in, This represents the corrected output value. The original measured value of the i-th parameter. Let be the sensitivity coefficient of the i-th parameter. This represents the interference coefficient of the j-th parameter on the i-th parameter. This is the system error correction value.

[0024] The parameter detection module includes a turbidity detection module, a conductivity module, a pH value module, and a temperature module. The turbidity module, after being calibrated based on a preset value, collects the turbidity signal of the liquid in the mine and transmits it to the signal processing module. The conductivity module adopts a four-electrode structure to measure the conductivity signal of the liquid in the mine and transmit it to the signal processing module. The pH module uses a glass pH electrode and a temperature sensor to transmit the potential difference and temperature signals output by the glass pH electrode to the signal processing module; the signal processing module calculates the pH value by calling a temperature compensation algorithm based on the received potential difference and temperature signals. The temperature module is used to collect temperature signals inside the mine and transmit them to the signal processing module.

[0025] In this embodiment, the turbidity detection module is designed as follows: Light source: Vishay VSMY2850G infrared LED, with 20mA drive current provided by PWM modulation; Optical path design: A 90° incident angle is adopted, and the receiver uses a Hamamatsu S1223-01 PIN photodiode; Signal processing: The signal is pre-amplified by the AD620 instrumentation amplifier and then converted to analog signal by the ADS1115. Calibration: Three-point calibration was performed using Formazine standard solution, employing a nonlinear error compensation algorithm, the expression of which is:

[0026] in, This is the turbidity output value. Represents the original voltage signal. The coefficients are determined by fitting using the least squares method.

[0027] The conductivity module is designed as follows: A four-electrode structure is adopted, and a 1kHz excitation signal is applied. The conductivity signal is converted into an acquireable voltage signal through a signal conditioning circuit.

[0028] The pH module is designed as follows: It is equipped with a glass pH electrode and a PT100 temperature sensor. The potential difference and temperature signal output by the electrode are transmitted to the signal processing module, which calculates the pH value according to the existing temperature compensation algorithm.

[0029] The temperature module is designed as follows: It integrates a digital temperature sensor and communicates with the signal processing module via a single bus to directly acquire digital temperature signals.

[0030] The signal processing module processes the received electrical signal using a parameter interference compensation algorithm to eliminate interference between the parameter electrical signals. In this embodiment, the signal processing module uses a TMS320F28335 DSP processor.

[0031] The intrinsically safe power supply module is used to periodically poll and power on each parameter detection module in the parameter detection module based on a preset time-sharing power supply strategy; among them, such as Figure 2 As shown, the intrinsically safe power supply module includes a power supply unit and a power supply control unit. The power supply control unit has a preset time-sharing power supply strategy and controls the power supply unit to supply power to each parameter detection module in the parameter detection module according to the time-sharing power supply strategy based on the MOSFET switching circuit. At the same time, the power supply unit also provides power to the signal processing module, communication module, etc.

[0032] In this embodiment, the preset time-sharing power supply strategy is as follows: Based on the operating voltage requirements of different parameter detection modules, an adjustable voltage range value is output through a DC-DC conversion module, and power supply voltage compensation is performed according to the health status of the parameter detection modules; the expression is:

[0033] in, This represents the adjustable voltage range value of the i-th parameter detection module; This represents the rated voltage of the i-th parameter detection module; This indicates the health status of the i-th parameter detection module; Based on the amount of data generated by the parameter detection module, the drive current of the parameter detection module is supplied on demand; the expression is:

[0034] in, Indicates the drive current value. Indicates the basic drive current. Indicates the amount of task data. This indicates the maximum data size per frame.

[0035] Specifically, the health of the turbidity detection module is quantitatively evaluated by considering the stability of its light source current, the response sensitivity of the photodiode, and the signal-to-noise ratio; the health of the conductivity module is quantitatively evaluated by considering the degree of electrode polarization and zero-point drift; the health of the pH module is quantitatively evaluated by considering the electrode impedance and the effectiveness of temperature compensation; and the health of the temperature module is quantitatively evaluated by considering the stability of the sampled values ​​and the consistency of redundancy verification.

[0036] As for the acquisition of task data volume, it is obtained by weighted summation based on the data volume of a single detection module in a single detection. The data volume of a single detection module consists of frame header, module ID, data type, valid data, check bit, and frame tail.

[0037] Therefore, the sensor health status and task data obtained through the above description can accurately reflect the status of the detection module and the task requirements, providing reliable data support for the adaptive adaptation of power supply parameters, and ensuring that the power supply strategy meets both the detection performance requirements and achieves power consumption optimization.

[0038] The power supply unit in this embodiment includes an input stage and a conversion stage, such as... Figure 3 As shown, the input stage is a 15-25V wide voltage input. After passing through an LCπ-type filter and a TVC protection diode, overvoltage protection is performed, with an overvoltage protection threshold of 26V. Then, it goes through two conversion stages: a first-stage DC-DC converter using an LM2596 converter, where the voltage is converted from 24V to 5V; and a second-stage DC-DC converter using a TPS5430 converter, where the voltage is converted from 5V to 3.3V. The converted voltages are then supplied to the individual parameter detection module, the signal processing module, and the communication module, respectively.

[0039] The communication module receives and transmits electrical signals from the parameter detection modules after processing by the signal processing module. During signal reception and transmission, it uses a preset dynamic impedance matching technique to adjust signal transmission. The communication module includes a receiving unit, a transmitting unit, and a dynamic impedance matching unit. The receiving unit receives the electrical signals from the parameter detection modules via the Modbus-RTU protocol. The transmitting unit transmits the electrical signals to the ground server. The dynamic impedance matching unit periodically sends a sweep frequency signal based on the impedance matching network, determines the change in cable characteristic impedance by detecting the signal attenuation rate, and adjusts the drive current according to the detected signal attenuation rate. The expression is:

[0040] in, Represents frequency Signal attenuation rate at the following levels Represents frequency The output signal voltage is below. Represents frequency The input signal voltage.

[0041] In this embodiment, the receiving and transmitting units use a MAX13487E RS485S transceiver to transmit and receive data. The dynamic impedance matching unit consists of a 120Ω terminating resistor and a 10mH common-mode choke. The dynamic impedance matching unit adjusts the transceiver's drive current according to the detected attenuation rate.Figure 4 The transmission impedance matching circuit shown has a grounded shield. It first sends a sweep frequency signal (0.1-10MHz), which passes through a common-mode choke and a terminating resistor. The impedance data and characteristics are then fed back, and the drive current (10-120mA) is adjusted according to the impedance data and characteristics. For example, if the attenuation rate is >30%, the drive current is set to 120mA; if the attenuation rate is >20% and ≤30%, the drive current is set to 80mA; and if the attenuation rate is <20%, the drive current is set to 40mA.

[0042] Finally, in practical applications, task allocation is based on a real-time operating system, and this application schedules execution according to task priority and periodicity: Task 1 (Data Acquisition): Priority 5, collect data from each parameter detection module every 100ms; Task 2 (Data Processing): Priority 4, perform compensation processing on the collected data every 200ms; Task 3 (Communication Transmission): Priority 3. When an event such as data processing completion is triggered, the data will be transmitted to the ground server.

[0043] The above are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An integrated detection system for intrinsically safe multi-parameter sensors used in mining, characterized in that: It includes a parameter detection module, a signal processing module, an intrinsically safe power supply module, and a communication module, among which: The parameter detection module is communicatively connected to the signal processing module. The parameter detection module integrates several parameter detection modules. The signal processing module is used to collect the electrical signals output by each parameter detection module in the parameter detection module and eliminate mutual interference between different parameters based on a preset multi-parameter cross-interference compensation algorithm. The intrinsically safe power module is used to periodically poll and power on each parameter detection module in the parameter detection module based on a preset time-sharing power supply strategy; The communication module is used to receive and send electrical signals from the parameter detection modules after processing by the signal processing module, and to adjust the signal transmission by calling a preset dynamic impedance matching technology during the reception and transmission of electrical signals.

2. The integrated detection system of the intrinsically safe multi-parameter sensor for mining as described in claim 1, characterized in that: The preset multi-parameter cross-interference compensation algorithm expression is: in, This represents the corrected output value. The original measured value of the i-th parameter. Let be the sensitivity coefficient of the i-th parameter. This represents the interference coefficient of the j-th parameter on the i-th parameter. This is the system error correction value.

3. The integrated detection system of the intrinsically safe multi-parameter sensor for mining as described in claim 1, characterized in that: The parameter detection module includes a turbidity detection module, a conductivity module, a pH value module, and a temperature module. The turbidity module, after being calibrated based on a preset value, collects the turbidity signal of the liquid in the mine and transmits it to the signal processing module. The conductivity module adopts a four-electrode structure to measure the conductivity signal of the liquid in the mine and transmit it to the signal processing module. The pH module uses a glass pH electrode and a temperature sensor to transmit the potential difference and temperature signals output by the glass pH electrode to the signal processing module; the signal processing module calculates the pH value by calling a temperature compensation algorithm based on the received potential difference and temperature signals. The temperature module is used to collect temperature signals inside the mine and transmit them to the signal processing module.

4. The integrated detection system of the intrinsically safe multi-parameter sensor for mining as described in claim 1, characterized in that: The intrinsically safe power module includes a power supply unit and a power supply control unit. The power supply control unit has a preset time-sharing power supply strategy and controls the power supply unit to supply power to each parameter detection module in the parameter detection module according to the time-sharing power supply strategy based on the MOSFET switching circuit.

5. The integrated detection system of the intrinsically safe multi-parameter sensor for mining as described in claim 4, characterized in that: The preset time-sharing power supply strategy is as follows: Based on the operating voltage requirements of different parameter detection modules, an adjustable voltage range value is output through a DC-DC conversion module, and power supply voltage compensation is performed according to the health status of the parameter detection modules; the expression is: in, This represents the adjustable voltage range value of the i-th parameter detection module; This represents the rated voltage of the i-th parameter detection module; This indicates the health status of the i-th parameter detection module; Based on the amount of data generated by the parameter detection module, the drive current of the parameter detection module is supplied on demand; the expression is: in, Indicates the drive current value. Indicates the basic drive current. Indicates the amount of task data. This indicates the maximum data size per frame.

6. The integrated detection system of the intrinsically safe multi-parameter sensor for mining as described in claim 1, characterized in that: The communication module includes a receiving unit, a transmitting unit, and a dynamic impedance matching unit. The receiving unit receives electrical signals from various parameter detection modules after processing by the signal processing module. The transmitting unit transmits the electrical signals to a ground server. The dynamic impedance matching unit periodically sends a swept-frequency signal based on the impedance matching network, determines the change in cable characteristic impedance by detecting the signal attenuation rate, and adjusts the drive current according to the detected signal attenuation rate. The expression is: in, Represents frequency Signal attenuation rate at the following levels Represents frequency The output signal voltage is below. Represents frequency The input signal voltage.

7. The integrated detection system of the intrinsically safe multi-parameter sensor for mining as described in claim 1, characterized in that: It also includes a composite explosion-proof enclosure, which is made of Q235A steel plate, with an epoxy antistatic coating on the surface, an internal polycarbonate insulation layer, and internal electrical clearances. creepage distance .

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