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CN-122017709-A - Port machinery insulating coating detector calibration device and method

CN122017709ACN 122017709 ACN122017709 ACN 122017709ACN-122017709-A

Abstract

A calibration device and a method for a harbour machinery insulating coating detector. The device comprises an adjustable standard resistance box, a digital multimeter and a high-precision current sensor, wherein the adjustable standard resistance box and the digital multimeter are connected with an insulating coating detector, and the high-precision current sensor is used for measuring current by passing through closed feedback of the insulating coating detector. The calibration device and the calibration method for the insulating coating detector of the harbour machinery solve the problem of high-precision calibration of multiple threshold voltages, resistors and currents of the insulating coating detector, construct an uncertainty evaluation model aiming at resistance parameters, and analyze uncertainty factors influencing measurement results. The device has complete functions, compact structure, scientific and reasonable calibration method, good reproducibility, better innovation and popularization and application values, and effectively ensures the accuracy, stability and data credibility of the measurement result of the insulating coating detector.

Inventors

  • CAO YUANYUAN
  • LI SHAOHUI
  • YAN ZIFAN
  • ZHU YANLONG

Assignees

  • 交通运输部天津水运工程科学研究所

Dates

Publication Date
20260512
Application Date
20260327

Claims (6)

  1. 1. The calibration device of the insulating coating detector for the harbour machinery is characterized in that the insulating coating detector calibration device for the harbour machinery comprises an adjustable standard resistor box (200), a digital multimeter (300) and a high-precision current sensor (400), wherein the adjustable standard resistor box (200) is connected in series with the insulating coating detector (100) and is connected in parallel with the digital multimeter (300), the high-precision current sensor (400) is electrically connected with the digital multimeter (300) and is used for measuring closed loop current formed by the insulating coating detector (100) and the adjustable standard resistor box (200) in an electromagnetic induction mode.
  2. 2. The calibration device for the harbour machinery insulating coating detector according to claim 1, wherein the adjustable standard resistor box (200) is a ZX25a type adjustable standard resistor box, one end of the adjustable standard resistor box is connected with a probe (1002), the other end of the adjustable standard resistor box is connected with a multi-threshold detection alarm unit (1001) through a grounding wire (1003), the measurement range is 100 omega-100 kΩ, and the maximum allowable error is not more than 1%.
  3. 3. The calibration device for the harbour machinery insulating coating detector according to claim 1, wherein the digital multimeter (300) is a FLUKE 8588A type digital multimeter, the positive electrode of the voltage measurement port is connected with the probe (1002), the negative electrode of the voltage measurement port is connected with the multi-threshold detection alarm unit (1001) through the grounding wire (1003), the current measurement port is connected with the high-precision current sensor (400), the upper range limit is not lower than 200V, the measurement resolution is not lower than 0.1V, the impedance is not lower than 1G omega, and the expansion uncertainty of the voltage measurement result is not lower than 1/3 of the maximum allowable error of the voltage of the insulating coating detector (100).
  4. 4. The calibration device for the harbour machinery insulating coating detector according to claim 1, wherein the high-precision current sensor (400) is a SCTH model high-precision current sensor, the measurement precision is not lower than 1mA, and the aperture is not smaller than 20mm.
  5. 5. A method for calibrating a calibration device for a harbour machinery insulating coating tester according to any one of claims 1 to 4, characterized in that it comprises the following steps, carried out in sequence: A001, zeroing each gear of the adjustable standard resistor box (200), wherein the insulating coating detector (100) is in an open circuit state; a002, the multi-threshold detection alarm unit (1001) is sequentially dialed to each voltage gear, at each voltage gear, a digital multimeter (300) is utilized to measure the voltage value at the voltage gear, the arithmetic average value of 3 times of measured values is taken as the voltage value actually output by the insulating coating detector (100), and then the voltage value is compared with the nominal voltage value of the insulating coating detector (100) at the voltage gear according to a formula (1), so as to obtain the relative error of the voltage indication value of the insulating coating detector (100) at the ith voltage gear, and the calibration of voltage parameters is realized; (1); wherein: -the digital multimeter (300) measures an arithmetic average of voltage values 3 times at the i-th voltage gear, i=1, 2,3,..; -a nominal voltage value, V, of the insulating coating detector (100) at the i-th voltage step; -relative error, V, of the voltage indication of said insulating coating detector (100) at the ith voltage step; a003, sequentially dialing a multi-threshold detection alarm unit (1001) to each voltage gear, gradually reducing the resistance value of an adjustable standard resistance box (200) from 1.2 times of the nominal insulation resistance value corresponding to each voltage gear according to the nominal insulation resistance value corresponding to each voltage gear of an insulation coating detector (100), gradually increasing the loop current measured by a high-precision current sensor (400) along with the reduction of the resistance value, recording the resistance value of the adjustable standard resistance box (200) when the multi-threshold detection alarm unit (1001) starts to alarm, taking the arithmetic average value of the measured resistance values for 3 times as the actually output threshold resistance value of the insulation coating detector (100), comparing the arithmetic average value with the nominal threshold resistance value of the insulation coating detector (100) according to a formula (2), and obtaining the resistance indication relative error of the insulation coating detector (100) at the ith voltage gear so as to realize calibration of resistance parameters; (2); wherein: -the digital multimeter (300) measures an arithmetic average of resistance values 3 times at the i-th voltage gear, i=1, 2,3,..; -a nominal threshold resistance value, Ω, of the insulating coating detector (100) at the i-th voltage step; -the resistance indication relative error, Ω, of the insulating coating detector (100) at the i-th voltage step; a004, sequentially dialing a multi-threshold detection alarm unit (1001) to each voltage gear, adjusting the resistance value of an adjustable standard resistance box (200) to the corresponding nominal insulation resistance value of each voltage gear at each voltage gear, measuring the loop current value at the moment by using a high-precision current sensor (400), repeatedly measuring n times at each voltage gear according to the method, taking the arithmetic average value of the loop current values measured n times, and calibrating the current parameters according to a formula (3) to obtain the relative error of the current indication value of an insulation coating detector (100) at the ith voltage gear; (3); wherein: -an arithmetic average of loop current values measured n times by the high precision current sensor (400) at an i-th voltage gear, i=1, 2,3,..; -the loop current value, mA, measured by the high-precision current sensor (400) the jth time at the ith voltage level; -relative error of the current indication of the insulating coating detector (100) at the i-th voltage step, mA; n, the current times measured by the high-precision current sensor (400) at each voltage gear, and n is more than or equal to 10.
  6. 6. A method for evaluating uncertainty of a resistance measurement result by using the calibration device of the port machinery insulating coating detector according to any one of claims 1 to 4, wherein the method for evaluating uncertainty of the resistance measurement result comprises the following steps performed in sequence: b001, establishing a resistance measurement uncertainty assessment model according to a formula (4): (4); wherein: -resistance indication relative error, Ω, of said insulating coating detector (100); -nominal value of resistance, Ω, of the insulating coating detector (100); -an indication, Ω, of the adjustable standard resistance box (200); -resistance value variation caused by environmental temperature and humidity, Ω; b002, calculating the propagation rate according to the formula (5) and the sensitivity coefficient according to the formula (6) based on the uncertainty evaluation model of the resistance measurement result: (5); , , (6); b003 at a certain voltage of said multi-threshold detection alarm unit (1001) At the gear position, according to the nominal insulation resistance value corresponding to the voltage gear position of the insulation coating detector (100), the resistance value of the adjustable standard resistance box (200) is gradually reduced from 1.2 times of the nominal insulation resistance value corresponding to the voltage gear position, the loop current measured by the high-precision current sensor (400) is gradually increased along with the reduction of the resistance value, when the multi-threshold detection alarm unit (1001) starts to alarm, the resistance value of the adjustable standard resistance box (200) is recorded, and the arithmetic average value of n times of measured resistance values is taken as the threshold resistance value actually output by the insulation coating detector (100) The measurement uncertainty introduced by the adjustable standard resistor box (200) is then calculated according to equation (7) : (7); B004. The resistance parameter calibration equipment is the adjustable standard resistance box (200), a class B evaluation method is adopted for the measurement uncertainty introduced by the adjustable standard resistance box (200), if the maximum allowable error of the adjustable standard resistance box (200) in the range of the nominal insulation resistance value interval corresponding to the voltage gear is a, the half width is a/2, the half width is estimated to be uniformly distributed, and the measurement uncertainty introduced by the adjustable standard resistance box (200) is calculated according to a formula (8) : (8); B005 the whole calibration process is carried out under the laboratory environment condition with controllable temperature and humidity, and the resistance change caused by the environment temperature and humidity is negligible, so ; B006 nominal value of resistance due to insulating coating Detector (100) Indication value of adjustable standard resistance box (200) Independently of each other, based on the formulas (5) to (8), the uncertainty of the synthetic standard of the resistance parameter measurement result of the insulating coating detector (100) is calculated according to the formula (9) : (9); B007 taking the inclusion factor k=2 based on the above synthetic standard uncertainty Calculating the expansion uncertainty of the resistance parameter measurement result of the insulating coating detector (100) according to the formula (10): (10)。

Description

Port machinery insulating coating detector calibration device and method Technical Field The invention belongs to the technical field of traffic water transportation, and particularly relates to a calibration device and method for a surface insulation coating detector of a port hoisting and loading and unloading machine. Background The port is used as an important component of a national comprehensive three-dimensional traffic network and an important strategic resource for economic and social development, and is an important support for accelerating the construction of traffic countries and constructing a modern industry system. The port machinery is core equipment for port intelligence, greenization and fusion development, and the quality level directly influences the safety and efficiency of port operation. Currently, most harbour machinery is made of cast iron, and insulating, antirust and anticorrosive materials are sprayed on the surface of the harbour machinery. If the quality of the mechanical coating is poor, the surface and key components are easily rusted in the operation process, the insulativity is reduced, the operation precision and the operation efficiency are affected slightly, the aging of the components is accelerated, the whole performance of the port machinery is reduced along with the long-term expiration load operation of the machinery, and great potential safety hazard and economic loss are brought. Therefore, along with the construction of wisdom, safe harbour, except installing stress, strain and the long-term monitoring sensor of long-term at harbour machinery key node additional, need regularly detect the insulativity to its surface that has the insulation requirement, if there is the leak, confirm the leak position with insulating coating detector to the operation safety of guarantor harbour machinery. The insulating coating detector is used for detecting the defects of micro pores, cracks and the like on the surface of the coating of the harbour machinery. FIG. 1 is a schematic diagram of a prior art insulating coating detector. As shown in FIG. 1, the insulating coating detector 100 comprises a multi-threshold detection alarm unit 1001, a probe 1002 and a grounding wire 1003, wherein a plurality of voltage values for different coating thicknesses are arranged in the multi-threshold detection alarm unit 1001, the coating thickness is usually not more than 500 μm and is connected with the probe 1002 through bolt fastening, the probe 1002 is made of a material with good water absorption performance including sponge and polyurethane, one end of the grounding wire 1003 is connected with the multi-threshold detection alarm unit 1001, and the other end is connected with the exposed surface of a port machine, which is communicated with a detection area. The working principle is mainly based on an electric loop detection method. In operation, the pore and crack positions are detected by contact sliding of the probe 1002, which wets the conductive liquid, over the surface coating of the port machinery. At the positions of the holes and the cracks, the multi-threshold detection alarm unit 1001, the probe 1002, the harbor machinery detection area and the grounding conductor 1003 form a closed loop, loop current is generated, and when the loop resistance is reduced below the insulation resistance threshold preset by the insulation coating detector 100, the insulation coating detector 100 emits an audible and visual alarm signal, so that the positions of the holes and the cracks are determined, and the multi-threshold detection alarm device has the characteristics of convenience in operation, accuracy in positioning and high precision. The key metering parameters are voltage and resistance indication errors for detecting different coating thicknesses and current change conditions in the resistance change process. Currently, no mature method is available for calibrating the parameters, thereby affecting the accuracy of the insulating coating detector and the reliability of the data. Therefore, the calibration device and the method for the harbour machinery insulating coating detector are researched to perform measurement calibration on parameters such as voltage, resistance and current, so that the accuracy of data in harbour machinery insulating coating detection is improved, and the calibration device and the calibration method have important significance and value for improving the safety and the efficiency of harbour machinery operation, reducing the operation risk and reducing the cost and enhancing the efficiency. Disclosure of Invention In order to solve the problems, the invention aims to provide a calibration device and a calibration method for a harbour machinery insulating coating detector, so as to realize high-precision calibration of parameters such as voltage, current, resistance and the like of the harbour machinery insulating coating detector. The calibration device of the h