Sensing system for detecting lubricating oil particles

Abstract

The invention discloses a sensing system for lubricating oil particle detection, and relates to the technical field of lubricating oil particle detection in highway bridge engineering construction machinery. In order to solve the technical problems in the prior art that high-precision particle detection is difficult to realize and real-time remote monitoring and data transmission cannot be realized in a complex oil liquid environment by an existing particle detection technology, the technical scheme provided by the invention is as follows: the sensing system for lubricating oil particle detection comprises an excitation coil, a signal processing circuit and a signal processing circuit, the constant magnetic field is generated; the induction coil is used for detecting the magnetic field change when the metal particles in the oil pass through the excitation coil; the signal conditioning circuit is used for amplifying and filtering the electric signal generated by the induction coil; and the A / D conversion circuit is used for converting the analog signal into a digital signal. The RS485 communication circuit is used for transmitting the digital signal to an upper computer; and the single-chip microcomputer control circuit is used for data interaction with an upper computer. The device is suitable for detecting lubricating oil particles of highway bridge engineering construction machinery.

Description

Technical Field

[0001] The invention relates to the technical field of lubricating oil particle detection in highway bridge engineering construction machinery. Background Art

[0002] In modern industry, the normal operation of equipment depends on the effective operation of the lubrication system, especially for mechanical equipment involving high-load operation, such as bridge engineering construction machinery; the quality monitoring of lubricating oil is particularly important. Existing lubricating oil monitoring technologies mainly focus on the physical and chemical properties of lubricating oil, such as viscosity, moisture content and oxidation degree. However, these parameters can only indirectly reflect the lubrication status of the equipment and cannot directly provide information about the internal wear of the equipment. In recent years, particle detection has gradually become an important means of assessing the health of mechanical equipment. By detecting metal particles in lubricating oil, the wear status of mechanical parts can be directly understood, thereby achieving early warning of equipment failure.

[0003] At present, common particle detection technologies on the market include optical particle counting and inductive particle detection. The optical particle counting method uses the principle of light scattering or transmission to detect the number and size of particles, but it is limited in identifying the types of metal particles. In addition, the optical method has high requirements for the cleanliness of the oil and is easily affected by oil contamination. The inductive particle detection method can effectively detect ferromagnetic particles by detecting the inductance changes caused by metal particles in the oil, but the detection effect on non-ferromagnetic particles is limited.

[0004] Although these methods have solved the problem of particle monitoring to a certain extent, the existing technology still has the following shortcomings: First, most of the existing detection systems have low particle recognition accuracy, especially in complex oil environments, it is difficult to achieve high-precision particle detection; second, many existing sensor systems lack the ability to automatically process signals and cannot achieve real-time remote monitoring and data transmission. Therefore, how to develop a sensor system that can detect metal particles in oil with high accuracy and in real time has become an important topic in the current technical field. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, that the existing particle detection technology is difficult to achieve high-precision particle detection in a complex oil environment, and cannot achieve real-time remote monitoring and data transmission, the technical solution provided by the present invention is:

[0006] A sensor unit for detecting lubricating oil particles, comprising:

[0007] An excitation coil for generating a constant magnetic field;

[0008] An induction coil, used to detect changes in the magnetic field when metal particles in the oil pass through the excitation coil;

[0009] A signal conditioning circuit for amplifying and filtering the electrical signal generated by the induction coil;

[0010] The A / D conversion circuit is used to convert the amplified analog signal into a digital signal.

[0011] Furthermore, a preferred embodiment is provided in which the constant magnetic field is generated by a sinusoidal alternating current.

[0012] Furthermore, a preferred embodiment is provided, wherein at least two induction coils are arranged inside the excitation coil, and when no metal particles pass through, the two induction coils are in an electromotive force equilibrium state.

[0013] Furthermore, a preferred embodiment is provided, wherein the frequency of the sinusoidal alternating current of the excitation coil is 1 kHz to 10 kHz.

[0014] Furthermore, a preferred embodiment is provided, wherein the resolution of the A / D conversion circuit is 12 bits to 16 bits.

[0015] Based on the same inventive concept, the present invention also provides a sensor system for detecting lubricating oil particles, which is applied to highway bridge engineering construction machinery, including:

[0016] The unit,

[0017] RS485 communication circuit, used to transmit digital signals to the host computer;

[0018] The single-chip microcomputer control circuit is used for data interaction with the host computer.

[0019] Based on the same inventive concept, the present invention also provides a method for detecting lubricating oil particles, based on the system, comprising:

[0020] Step of generating a constant magnetic field;

[0021] The step of detecting the change of the constant magnetic field as an electrical signal;

[0022] A step of amplifying and filtering the electrical signal;

[0023] Performing steps of analog-to-digital signal conversion;

[0024] The step of uploading the converted signal.

[0025] Based on the same inventive concept, the present invention also provides a computer storage medium for storing a computer program, and when the computer reads the computer program, the computer executes the described method.

[0026] Based on the same inventive concept, the present invention also provides a computer, including a processor and a storage medium. When the processor reads a computer program stored in the storage medium, the computer executes the method described.

[0027] Based on the same inventive concept, the present invention also provides a computer program product, which is a computer program. When the computer program is executed, the method described above is implemented.

[0028] Compared with the prior art, the technical solution provided by the present invention is beneficial in that:

[0029] The excitation coil generates a constant magnetic field by applying a sinusoidal alternating current. Compared with the existing electric induction detection technology, this method effectively ensures the stability and uniformity of the magnetic field, thereby improving the accuracy of particle detection. The traditional electric induction method is susceptible to environmental noise interference due to the instability of the magnetic field, while the present invention makes the detection more reliable by precisely controlling the magnetic field frequency. It is particularly suitable for highway bridge construction machinery. Due to the complex environment and the susceptibility of the lubrication system to contamination, the constant magnetic field design of the present invention effectively improves the detection accuracy and system stability.

[0030] The induction coil is composed of two coils arranged inside the excitation coil, and is in an electromotive force equilibrium state when no metal particles pass through. This design significantly improves the sensitivity of detection and can effectively distinguish extremely small particle signals. Compared with existing optical detection technology, the present invention avoids the high requirements for oil cleanliness and can maintain high-precision detection in complex oil environments. It is particularly suitable for complex working conditions in highway bridge engineering construction machinery.

[0031] The signal conditioning circuit uses high-precision amplification, filtering and shaping to fully optimize the output signal of the induction coil before digitization. Compared with the errors caused by insufficient signal conditioning in traditional systems, the present invention effectively filters out the noise in non-target frequency bands through a bandpass filter, ensuring the purity and stability of the signal. This method allows the entire detection process to maintain a high signal-to-noise ratio in a noisy industrial environment, ensuring the accuracy of the particle detection results.

[0032] The A / D conversion circuit is combined with the single-chip control circuit to realize the automatic acquisition and processing of signals, and remotely communicate with the host computer through the RS485 communication circuit. This design of automatic processing and remote transmission has greatly improved the efficiency and real-time performance of data processing, especially in highway bridge construction machinery, which can obtain the equipment operation status in time, avoid mechanical failures caused by poor lubrication, and significantly reduce labor costs and response time to equipment failures.

[0033] It is suitable for the detection of lubricating oil particles in highway and bridge construction machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a physical picture of the data collector;

[0035] Figure 2 This is a schematic diagram of the connection between ZYNQ and Ethernet PHY chip;

[0036] Figure 3 Internal electrical block diagram of the chip used for RS485 communication circuit. DETAILED DESCRIPTION

[0037] In order to make the advantages and benefits of the technical solution provided by the present invention more clearly reflected, the technical solution provided by the present invention is now further described in detail in conjunction with the accompanying drawings, specifically:

[0038] Embodiment 1: This embodiment provides a sensor unit for detecting lubricating oil particles, including:

[0039] An excitation coil for generating a constant magnetic field;

[0040] An induction coil, used to detect changes in the magnetic field when metal particles in the oil pass through the excitation coil;

[0041] A signal conditioning circuit for amplifying and filtering the electrical signal generated by the induction coil;

[0042] The A / D conversion circuit is used to convert the amplified analog signal into a digital signal.

[0043] Embodiment 2: This embodiment further limits the sensor unit for lubricating oil particle detection provided in Embodiment 1, and generates a constant magnetic field through a sinusoidal alternating current.

[0044] Embodiment 3: This embodiment further limits the sensor unit for lubricating oil particle detection provided in embodiment 1. There are at least two induction coils arranged inside the excitation coil. When no metal particles pass through, the two induction coils are in an electromotive force balance state.

[0045] Embodiment 4: This embodiment further limits the sensor unit for lubricating oil particle detection provided in Embodiment 1, and the frequency of the sinusoidal alternating current of the excitation coil is 1 kHz to 10 kHz.

[0046] Embodiment 5: This embodiment further limits the sensor unit for lubricating oil particle detection provided in Embodiment 1, and the resolution of the A / D conversion circuit is 12 bits to 16 bits.

[0047] Embodiment 6: This embodiment provides a sensor system for detecting lubricating oil particles, which is applied to highway bridge engineering construction machinery, including:

[0048] The unit provided in the first embodiment,

[0049] RS485 communication circuit, used to transmit digital signals to the host computer;

[0050] The single-chip microcomputer control circuit is used for data interaction with the host computer.

[0051] The main components of the system include:

[0052] Excitation coil:

[0053] Responsible for generating AC magnetic field and forming a stable magnetic induction area. When metal particles pass through, it will generate magnetic field disturbance. The excitation coil is one of the core components of the entire detection system.

[0054] The coil is powered by a sinusoidal AC power supply to maintain a constant magnetic field, ensuring that changes in the magnetic field are detected as particles enter or pass through the coil.

[0055] Induction coil:

[0056] The device senses the effect of particles on the magnetic field as they pass through the excitation coil and converts this change into a voltage signal. The device consists of two induction coils that detect changes in the magnetic field to determine the presence and characteristics of particles.

[0057] When no particles pass through, the two induction coils remain balanced and the output electromotive force is zero; when metal particles enter, the induction coils generate voltage signals for subsequent signal processing.

[0058] Signal conditioning circuit:

[0059] The electrical signal generated by the induction coil is amplified, filtered and shaped for subsequent processing. It reduces signal noise and improves signal quality, facilitating accurate particle detection.

[0060] It is able to precisely process very small voltage changes, thus accurately reflecting the passing state of metal particles.

[0061] A / D conversion circuit:

[0062] Convert analog signals into digital signals to facilitate further analysis and processing by the microcontroller.

[0063] The high-precision A / D converter ensures the sampling accuracy of the signal and provides an accurate basis for subsequent data processing.

[0064] RS485 communication circuit:

[0065] Responsible for transmitting the processed data to the host computer for further monitoring and analysis.

[0066] It adopts RS485 protocol, has a long transmission distance and strong anti-interference ability, and is suitable for data transmission in industrial environments.

[0067] Single chip microcomputer control circuit:

[0068] Responsible for the control and management of the entire sensor, including signal acquisition, A / D conversion control, and data transmission management.

[0069] As the control center of the system, the microcontroller coordinates the work of each part to ensure the synchronization and accuracy of signal acquisition, processing and transmission.

[0070] Specific:

[0071] The excitation coil generates a constant magnetic field

[0072] A sinusoidal alternating current is applied through the excitation coil to generate a steady magnetic field, which serves as the basis of the detection system.

[0073] When the system is started, a sinusoidal AC current with a frequency of 1kHz to 10kHz is passed through the excitation coil. The excitation coil is made of high magnetic permeability material and can generate a uniform and constant magnetic field area to ensure the stability and uniformity of the magnetic field. In the high-load operation environment of highway and bridge construction machinery, maintaining a constant magnetic field helps reduce noise interference and ensure the accuracy of subsequent detection.

[0074] Metal particles pass through the excitation coil area

[0075] The metal particles in the oil pass through the magnetic field generated by the excitation coil, disturbing the equilibrium state of the magnetic field.

[0076] The lubricating oil is pumped into the area of ​​the excitation coil and the induction coil through the oil circuit. The metal particles in the oil, such as ferromagnetic particles and non-ferromagnetic particles, will pass through the magnetic field inside the excitation coil. Due to the presence of particles, the magnetic field is locally disturbed. Especially in highway bridge construction machinery, the generation of metal particles is inevitable, and these particles will directly affect the wear state of the machinery.

[0077] Induction coil detects changes in magnetic field

[0078] The induction coil senses the change in magnetic field and generates a corresponding voltage signal.

[0079] The induction coil consists of two high-permeability coils located inside the excitation coil. When no metal particles pass through, the two induction coils maintain electromotive force balance. When metal particles pass through, the induction coils sense the change in the magnetic field and generate tiny voltage signals, which reflect the size and number of particles. The dual induction coil structure of this design can significantly improve the sensitivity of detection, effectively identify extremely small particles, and ensure detection accuracy under complex working conditions.

[0080] Signal conditioning circuit processes the signal

[0081] The electrical signal output by the induction coil is amplified, filtered and shaped to obtain a high-quality signal.

[0082] The voltage signal generated by the induction coil is transmitted to the signal conditioning circuit, which includes a high-precision bandpass filter and an amplifier module. First, the bandpass filter is used to filter out noise signals in non-target frequency bands, thereby improving the purity of the signal. Then, the signal is amplified by the amplifier module to make the weak signal reach a level that can be subsequently digitally processed. The signal conditioning process ensures signal stability and a high signal-to-noise ratio, which is suitable for the complex oil environment in highway bridge engineering construction machinery.

[0083] A / D conversion circuit converts analog signal into digital signal

[0084] Convert the conditioned analog signal into a digital signal for subsequent processing.

[0085] The analog signal after signal conditioning is sent to the A / D conversion circuit for digital processing. The A / D converter uses a 12-bit to 16-bit high-resolution module to ensure the accuracy of the signal after conversion. The digitized signal can effectively retain the characteristics of the original signal, which is convenient for subsequent analysis and processing.

[0086] 6. Single chip microcomputer control circuit for signal acquisition and data processing

[0087] The digital signal is collected and processed through the single chip control circuit.

[0088] The digital signal is collected and processed by the single-chip microcomputer control circuit. The single-chip microcomputer contains a temperature compensation module, which is used to perform temperature compensation on the signal to improve the stability of the system under different environments. The single-chip microcomputer performs a preliminary analysis on the collected data, such as calculating the concentration of particles, the distribution of particle sizes, etc. These data can provide direct feedback information on the wear status of the equipment, especially in highway bridge engineering machinery, which can timely warn of abnormal equipment status.

[0089] RS485 communication circuit realizes remote data transmission

[0090] The processed data is transmitted to the host computer through the RS485 communication circuit for monitoring.

[0091] The data processed by the microcontroller is transmitted to the host computer through the RS485 communication circuit. The RS485 communication module includes an isolation module to enhance the anti-interference ability of the system and ensure the reliability of data transmission. The data received by the host computer can display the particle content and characteristics in real time. The equipment maintenance personnel can judge the operating status of the equipment in time according to the data and take necessary maintenance measures. This design is particularly suitable for highway bridge engineering construction machinery, helping to timely discover potential lubrication problems and reduce equipment failure rates.

[0092] Connection structure and interaction between components:

[0093] Excitation coil and induction coil:

[0094] The magnetic field generated by the excitation coil covers the induction coil. When the metal particles pass through the center area of ​​the excitation coil, the induction coil senses the change in the magnetic field. The two coils interact with each other through the overlap of physical space.

[0095] Induction coil and signal conditioning circuit:

[0096] The weak voltage signal generated by the induction coil is transmitted to the signal conditioning circuit, which amplifies and filters the signal to eliminate noise and enhance the useful signal.

[0097] Signal conditioning circuit and A / D conversion circuit:

[0098] The conditioned analog signal is sent to the A / D conversion circuit for digital processing so that the system's microcontroller can perform accurate analysis.

[0099] A / D conversion circuit and single chip microcomputer control circuit:

[0100] The digitized signals are output by the A / D conversion circuit to the microcontroller control circuit, which stores and analyzes these signals and further processes them as needed.

[0101] Single chip control circuit and RS485 communication circuit:

[0102] The microcontroller transmits the processed data to the host computer through the RS485 communication circuit for monitoring personnel to view and analyze.

[0103] Coordination between components and overall function

[0104] Overall coordination relationship:

[0105] The excitation coil generates a magnetic field, and the induction coil senses the changes in the magnetic field and generates a voltage signal when metal particles pass through.

[0106] The signal conditioning circuit processes the voltage signal to ensure the quality of the signal.

[0107] The A / D conversion circuit converts the analog signal into a digital signal for further analysis and storage by the microcontroller control circuit.

[0108] Finally, the data is transmitted to the host computer through the RS485 communication circuit to achieve remote monitoring and analysis.

[0109] Embodiment 7: This embodiment provides a method for detecting lubricating oil particles, based on the system provided in Embodiment 6, including:

[0110] Step of generating a constant magnetic field;

[0111] The step of detecting the change of the constant magnetic field as an electrical signal;

[0112] A step of amplifying and filtering the electrical signal;

[0113] Performing steps of analog-to-digital signal conversion;

[0114] The step of uploading the converted signal.

[0115] Embodiment 8: This embodiment provides a computer storage medium for storing a computer program. When the computer reads the computer program, the computer executes the method provided in embodiment 7.

[0116] Embodiment 9: This embodiment provides a computer, including a processor and a storage medium. When the processor reads a computer program stored in the storage medium, the computer executes the method provided in embodiment 7.

[0117] Embodiment 10: This embodiment provides a computer program product, which is a computer program. When the computer program is executed, the method provided in embodiment 7 is implemented.

[0118] Implementation Method XI: Combination Figure 1-3 This embodiment is described in detail by using specific examples to further describe the technical solution provided above. Specifically:

[0119] Overall circuit design

[0120] The detection circuit is mainly composed of sensor drive circuit, signal conditioning circuit, A / D conversion circuit and RS485 communication circuit. The sensor drive circuit generates the sinusoidal current required to excite the sensitive element. The conditioning circuit amplifies, precisely shapes, and low-pass filters the output voltage signal of the sensitive element to remove noise. Then, the A / D converter built into the microcontroller converts the conditioned signal into analog-to-digital, collects, and stores it. Finally, the digital signal is sent to the host computer through the communication circuit. The hardware detection circuit design includes sensor drive circuit, signal conditioning circuit, and communication circuit. The sensor drive circuit includes a filter circuit and a voltage-current conversion circuit; the signal conditioning circuit includes an amplifier circuit, a precision shaping circuit, and a low-pass filter circuit; the microcontroller control circuit serves as the control center of the system, controlling the drive signal and collecting the output of the induction coil.

[0121] Communication Protocol

[0122] Data Bus

[0123] The factory setting baud rate of 485 is 115.2k, 1 stop bit, and CRC check is CRC16 / XModem protocol.

[0124] PID is the unique identification code of the product, ID is the address of the sensor in the network, in the factory state, ID is the last two decimal digits of PID (users can modify it through the sensor setting command).

[0125] The data bus command set is shown in Table 1.

[0126] Table 1 Data bus command set

[0127] Command or request Command or request code Sensor Settings 0x46(70) Read sensor properties 0x43(67) Read sensor status 0x44(68) The current parameters of the sensor are cleared 0x45(69) Data collection 0x42(66) Data collection successful response 0x47(71)

[0128] in,

[0129] 485 bus command and data format

[0130]

[0131] Sensor Settings

[0132] The host computer sends a command: The host computer sends a total of 13 bytes to the lower computer at the current baud rate:

[0133]

[0134] The baud rate can be set to 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 43000, 56000, 57600, and 115200.

[0135] After receiving this instruction, the lower computer writes the ID and baud rate into the Flash, initializes the serial port according to the new baud rate, and runs at the newly set baud rate.

[0136] Read sensor properties

[0137] Detect whether the sensor with the specified ID address is in working state.

[0138] Send command from host computer

[0139] The host computer sends a total of 8 bytes to the slave computer:

[0140] byte content byte content byte content 0 ID 3 0x00 6 CRC16 / XMODEM lower 8 bits 1 0x43(67) 4 0x08 7 CRC16 / XMODEM high 8 bits 2 0x00 5 0x00 8

[0141] The lower computer sends data to the upper computer

[0142] The lower computer sends a total of 14 bytes to the upper computer:

[0143]

[0144] Sensor status detection

[0145] Get the sensor status value of the specified ID address.

[0146] Send command from host computer

[0147] The host computer sends a total of 8 bytes to the slave computer:

[0148] byte content byte content byte content byte content 0 ID 2 0x00 4 0x08 6 CRC16 / XMODEM lower 8 bits 1 0x44(68) 3 0x00 5 0x00 7 CRC16 / XMODEM high 8 bits

[0149] The lower computer sends data to the upper computer

[0150] The lower computer sends a total of 12 bytes to the upper computer:

[0151] byte content byte content byte content byte content 0 ID 3 0x00 6 Fault code lower 8 bits 9 CRC16 / XMODEM lower 8 bits 1 0x44(68) 4 0x0B 7 8 digits in fault code 10 CRC16 / XMODEM high 8 bits 2 0x00 5 0x00 8 Fault code high 8 bits 11 0xFF

[0152] Sensor dynamic test parameters reset

[0153] Clear the dynamic data of the wear particles detected by the sensor with the specified ID address

[0154] Send command from host computer

[0155] The host computer sends a total of 8 bytes to the slave computer:

[0156] byte content byte content byte content byte content 0 ID 2 0x00 4 0x08 6 CRC16 / XMODEM lower 8 bits 1 0x45(69) 3 0x00 5 0x00 7 CRC16 / XMODEM high 8 bits

[0157] The lower computer sends data to the upper computer

[0158] The lower computer sends a total of 9 bytes to the upper computer:

[0159] byte content byte content byte content byte content 0 ID 3 0x00 6 0x88 9 0xFF 1 0x45(69) 4 0x08 7 CRC16 / XMODEM lower 8 bits 2 0x00 5 0x00 8 CRC16 / XMODEM high 8 bits

[0160] Data Sampling

[0161] Gets various wear particle data detected by the sensor with the specified ID address since the last sampling.

[0162] Fe1~Fe10 are the number of abrasive grains in ten size bands of ferromagnetic abrasive grains.

[0163] MFe1~MFe10 are the masses of ten size bands of ferromagnetic abrasive particles. For the two series of sensors ZXMS5 and ZXMS8, the mass unit of ferromagnetic abrasive particles is: 0.1μg (microgram), and the mass unit of ferromagnetic abrasive particles for other series of sensors is μg (microgram).

[0164] NFe1~NFe4 are the number of abrasive grains in four size bands of non-ferromagnetic abrasive grains.

[0165] MFe is the total mass of ferromagnetic abrasive particles. For the sensors of ZXMS5 and ZXMS8 series, the unit of ferromagnetic abrasive particle mass is 0.1 μg (microgram). For the sensors of other series, the unit of ferromagnetic abrasive particle mass is μg (microgram).

[0166] ModStatus is the sensor status value.

[0167] Send command from host computer

[0168] The host computer sends a total of 8 bytes to the slave computer:

[0169] byte content byte content byte content byte content 0 ID 2 0x00 4 0x08 6 CRC16 / XMODEM lower 8 bits 1 0x42(66) 3 0x00 5 0x00 7 CRC16 / XMODEM high 8 bits

[0170] The lower computer sends data to the upper computer

[0171] The lower computer sends a total of 83 bytes to the upper computer:

[0172] byte content byte content byte content byte content 0 ID 21 Fe4 lower 8 bits 42 Fe8 high 8 bits 63 NFe4 upper 8 bits 1 0x42(66) 22 Fe4 high 8 bits 43 MFe8 lower 8 bits 64 The total mass of ferromagnetic abrasive particles is 8 digits lower 2 0x00 23 MFe4 lower 8 bits 44 MFe8 8-bit 65 8 digits of the total mass of ferromagnetic abrasive particles 3 0x00 24 MFe4 8-bit 45 MFe8 high 8 bits 66 Total mass of ferromagnetic abrasive particles is 8 digits higher 4 0x52 25 MFe4 high 8 bits 46 Fe9 lower 8 bits 67 Density low 8 bits 5 0x00 26 Fe5 low 8 bits 47 Fe9 high 8 bits 68 Density high 8 bits 6 Fe1 lower 8 bits 27 Fe5 high 8 bits 48 MFe9 lower 8 bits 69 Viscosity 8 bits lower 7 Fe1 high 8 bits 28 MFe5 lower 8 bits 49 MFe9 8th position 70 Viscosity 8 bits high 8 MFe1 lower 8 bits 29 MFe5 8 50 MFe9 upper 8 bits 71 Dielectric constant lower 8 bits 9 8-bit in MFe1 30 MFe5 upper 8 bits 51 Fe10 low 8 bits 72 Dielectric constant high 8 bits 10 MFe1 high 8 bits 31 Fe6 low 8 bits 52 Fe10 high 8 bits 73 Temperature low 8 bits 11 Fe2 low 8 bits 32 Fe6 high 8 53 MFe10 lower 8 bits 74 Temperature high 8 bits 12 Fe2 high 8 33 MFe6 lower 8 bits 54 8-bit in MFe10 75 Moisture content 8 bits lower 13 MFe2 lower 8 bits 34 8-bit in MFe6 55 MFe10 high 8 bits 76 Moisture content 8 digits high 14 8-bit in MFe2 35 MFe6 upper 8 bits 56 NFe1 lower 8 bits 77 Fault code lower 8 bits 15 MFe2 high 8 bits 36 Fe7 low 8 bits 57 NFe1 high 8 bits 78 8 digits in fault code 16 Fe3 low 8 bits 37 Fe7 high 8 bits 58 NFe2 lower 8 bits 79 Fault code high 8 bits 17 Fe3 high 8 38 MFe7 lower 8 bits 59 NFe2 upper 8 bits 80 CRC16 / XMODEM lower 8 bits 18 MFe3 lower 8 bits 39 MFe7 8-bit 60 NFe3 lower 8 bits 81 CRC16 / XMODEM high 8 bits 19 8-bit in MFe3 40 MFe7 upper 8 bits 61 NFe3 upper 8 bits 82 0xFF 20 MFe3 upper 8 bits 41 Fe8 lower 8 bits 62 NFe4 lower 8 bits

[0173] The host computer successfully receives the test data response

[0174] The host computer sends a total of 8 bytes to the slave computer:

[0175]

[0176] Among them, the data collector is as follows Figure 1 As shown in the figure, it includes the monitoring data output by the particle sensor, which is transmitted to the host computer software for display and analysis after preprocessing. For other data, the collector also reserves vibration, speed, torsional vibration and other measurement functions to facilitate the subsequent function expansion according to the equipment status monitoring needs.

[0177] The acquisition board of the collector provides network communication services for users through the 88E1111 Ethernet PHY chip. Figure 2As shown in the figure, the Ethernet PHY chip is connected to the GPIO interface of BANK501 on the PS side of ZYNQ. The 88E1111 chip supports 10 / 100 / 1000Mbps network transmission rate and communicates with the MAC layer of the Zynq7000 PS system through the RGMII interface. The 88E1111 supports MDI / MDX adaptation, various speed adaptation, Master / Slave adaptation, and supports MDIO bus for PHY register management.

[0178] The RS485 communication chip uses the SP485 chip. The internal block diagram of the chip is as follows: Figure 3 shown.

[0179] The technical solution provided by the present invention is further described in detail above through several specific implementation modes in order to highlight the advantages and benefits of the technical solution provided by the present invention. However, the several specific implementation modes described above are not intended to be used as limitations on the present invention. Any reasonable modification and improvement of the present invention, combination of implementation modes and equivalent substitution within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sensor unit for detecting lubricating oil particles, characterized in that: include: An excitation coil for generating a constant magnetic field; An induction coil, used to detect changes in the magnetic field when metal particles in the oil pass through the excitation coil; A signal conditioning circuit for amplifying and filtering the electrical signal generated by the induction coil; The A / D conversion circuit is used to convert the amplified analog signal into a digital signal.

2. A sensor unit for detecting lubricating oil particles according to claim 1, characterized in that: A constant magnetic field is generated by a sinusoidal alternating current.

3. The sensor unit for lubricating oil particle detection according to claim 1, characterized in that: There are at least two induction coils arranged inside the excitation coil. When no metal particles pass through, the two induction coils are in an electromotive force balance state.

4. The sensor unit for detecting lubricating oil particles according to claim 1, characterized in that: The frequency of the sinusoidal alternating current of the excitation coil is 1 kHz to 10 kHz.

5. The sensor unit for detecting lubricating oil particles according to claim 1, characterized in that: The resolution of the A / D conversion circuit is 12 bits to 16 bits.

6. A sensor system for detecting lubricating oil particles, applied to highway bridge engineering construction machinery, characterized in that: include; The unit according to claim 1, RS485 communication circuit, used to transmit digital signals to the host computer; The single-chip microcomputer control circuit is used for data interaction with the host computer.

7. A method for detecting lubricating oil particles, characterized in that: The system according to claim 6 comprises: Step of generating a constant magnetic field; The step of detecting the change of the constant magnetic field as an electrical signal; A step of amplifying and filtering the electrical signal; Performing steps of analog-to-digital signal conversion; The step of uploading the converted signal.

8. A computer storage medium for storing a computer program, characterized in that: When the computer reads the computer program, the computer executes the method of claim 7.

9. A computer, comprising a processor and a storage medium, characterized in that: When the processor reads the computer program stored in the storage medium, the computer executes the method of claim 7 .

10. A computer program product, being a computer program, characterized in that When the computer program is executed, the method of claim 7 is implemented.

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