Radioisotope tracing strain clamp cavity grease injection amount detection system and method

Abstract

The invention relates to a radioisotope tracer strain clamp cavity grease injection amount detection system and method, and provides a method for preparing electric grease containing a low-energy gamma-ray isotope tracer agent, injecting the electric grease into a strain clamp cavity, sealing, scanning in a lead shielding detection cabin by using a high-resolution sodium iodine detector, and detecting the grease injection amount of the strain clamp cavity. And the grease thickness of each area is calculated according to the Lambert-Beer law, and the total grease injection amount is obtained through accumulation. According to the method, non-contact measurement is adopted, the detection sensitivity reaches 0.01 ml, the method is suitable for detecting small-size cavities and is particularly suitable for complex shapes such as deep holes and narrow slits, and the problem of low resolution in the prior art is solved; in addition, the radiation dose in the detection process is lower than 0.1 mu Sv, safety is ensured, the quality control risk is reduced, and the maintenance reliability of the power system is improved.

Description

Technical Field

[0001] This invention relates to the field of power equipment testing technology, specifically to a system and method for detecting the amount of grease injected into the cavity of a tension clamp using radioactive isotope tracing. Background Technology

[0002] Tension clamps are widely used in power distribution networks. The amount of grease filling inside the cavities of these clamps directly affects their corrosion resistance, insulation, and heat dissipation performance, which is crucial for the safe and stable operation of the distribution network. However, existing testing technologies have limitations in detecting the amount of grease filling in tension clamp cavities, mainly in resolution and accuracy. Whether it's the low resolution of ultrasonic testing methods making it difficult to accurately measure subtle differences in grease filling in small clamps, the poor detection effect of X-ray imaging on minute changes in filling volume, the limited performance of magnetic resonance imaging in detecting small cavities in metal components, the instability of accuracy of thermal imaging due to external environmental influences, the insufficient accuracy of electrical impedance tomography for small clamps, or even the physical damage caused by mechanical probe methods and their limitations, or the poor performance of laser scattering methods for detecting deep holes and narrow slits and their susceptibility to contaminant interference, none of these can meet the demand for high-sensitivity detection of grease filling in small clamp cavities. This leads to the inability to accurately identify subtle differences in grease filling, posing potential risks to clamp quality control and power system operation and maintenance. Therefore, the development of high-sensitivity testing technologies is particularly urgent. Summary of the Invention

[0003] The purpose of this invention is to provide a system and method for detecting the amount of grease injected into the cavity of tension clamps using radioactive isotope tracing, in order to solve the problems of poor detection effect, susceptibility to interference from contaminants, and inability to meet the need for high-sensitivity detection of the amount of grease filling in the cavity of small-sized tension clamps in the prior art.

[0004] To achieve the above objectives, the technical solution of the present invention is: a system for detecting the amount of grease injected into the cavity of a tension clamp using radioactive isotope tracing, comprising: -Tracer preparation apparatus for preparing electro-ester containing trace amounts of low-energy gamma-ray isotope tracers; - Grease injection device, used to inject the prepared electrical grease into the cavity of the tension clamp; -A sealing device used to seal the tension clamp after grease injection; - Lead-shielded testing chamber, used to house sealed tension clamps; - A gamma-ray detector is used to scan the surface of the wire clamp and record the gamma-ray count rate at each location; - A computing device for calculating the gamma-ray count rate based on the Lambert-Beer law I / I0=e -εclAssuming that the isotopes are uniformly distributed in the electrical grease, the grease thickness in each region within the clamp cavity is calculated, and the grease thickness in each region is summed to obtain the total grease injection amount.

[0005] A method for detecting the amount of grease injected into the cavity of a tension clamp using radioisotope tracing includes the following steps: - Prepare an electric ester containing trace amounts of a low-energy gamma-ray isotope tracer, wherein the activity of the low-energy gamma-ray isotope is 0.1 μCi to 1 μCi; - Inject the prepared electrical grease into the cavity of the tension clamp; - The tension clamp is sealed. - Place the sealed tension wire clamp inside the lead-shielded testing chamber; - The surface of the wire clamp is scanned using a gamma-ray detector, and the gamma-ray count rate at each location is recorded; According to Lambert-Beer's Law, I / I0 = e -εcl Based on the assumption that the isotopes are uniformly distributed in the electrical grease, the grease thickness in each region of the tension clamp cavity is calculated using the recorded gamma ray count rate, and the grease thickness in each region is added together to obtain the total amount of grease injected into the tension clamp cavity.

[0006] Preferably, the low-energy gamma-ray isotope is cobalt-57.

[0007] Preferably, the gamma-ray detector is a high-resolution sodium-iodine detector.

[0008] Preferably, the step of recording the gamma-ray count rate at each location further includes scanning the wire clamp multiple times at different locations and taking the average value as the final gamma-ray count rate.

[0009] The beneficial effects of this invention are: 1. Improve the resolution and accuracy of detecting the amount of grease filling in the cavity of tension clamps; 2. To achieve non-destructive, non-contact measurement of the grease distribution inside tension clamps; 3. Reduce the impact of the external environment on the test results to ensure the stability and reliability of the test; 4. It avoids the problem that traditional detection methods such as ultrasound, X-ray imaging, and magnetic resonance imaging are not effective in detecting minute changes in filling volume; 5. It overcomes the limitations of existing technologies in terms of resolution and accuracy when detecting the amount of grease injected into the cavity of tension clamps; 6. A highly efficient, accurate, and applicable method for detecting the amount of grease injected into the cavity of tension clamps under various complex environmental conditions is provided. Attached Figure Description

[0010] Figure 1This is a flowchart of the detection method of the present invention. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0012] A system for detecting the amount of grease injected into the cavity of a tension clamp using radioactive isotope tracers includes: a tracer preparation device for preparing an electric grease containing trace amounts of low-energy gamma-ray isotope tracers; a grease injection device for injecting the prepared electric grease into the cavity of the tension clamp; a sealing device for sealing the tension clamp after grease injection; a lead-shielded detection chamber for placing the sealed tension clamp; a gamma-ray detector for scanning the surface of the clamp and recording the gamma-ray count rate at each location; and a calculation device for calculating the gamma-ray count rate based on the Lambert-Beer law I / I0=e -εcl Assuming that isotopes are uniformly distributed in the electrical grease, the grease thickness in each region of the clamp cavity is calculated, and the grease thickness in each region is summed to obtain the total grease injection amount. The above components work together to achieve high-precision detection of the grease injection amount in the clamp cavity.

[0013] The tracer preparation device specifically includes a mixing unit and a metering unit. The mixing unit is responsible for uniformly dispersing the low-energy radiation isotope into the ointment material, ensuring that each batch of ointment has the same radioactive properties. The metering unit is mainly responsible for measuring and recording the amount of radiation isotope added to the ointment, ensuring the accuracy of each addition. Through the built-in high-precision sensor, the metering unit can monitor the activity of the radiation isotope in real time and automatically adjust the addition amount according to preset parameters. The two units work together to ensure that the activity of the low-energy radiation isotope is precisely controlled, and its activity range is set between 0.1 μCi and 1 μCi.

[0014] In this embodiment, a grease injection device with multiple nozzles was used. The diameter of each nozzle ranges from 0.5 mm to 2 mm, which can precisely control the injection volume and location of the grease. These nozzles are designed to accommodate wire clamp cavities of different sizes and shapes, ensuring that the grease can be evenly distributed, and also facilitating the evaluation of its internal condition by subsequent testing equipment.

[0015] In this embodiment, a multi-layer sealing material is used to seal the tension clamp. The specific implementation is as follows: First, elastic rubber with good sealing performance is selected as the first layer of sealing material. Its purpose is to improve the clamp's moisture and water resistance, ensuring that external moisture and impurities cannot enter the clamp's interior, thereby protecting the internal grease from contamination. Next, a layer of metal foil is covered on the outside of the elastic rubber. This layer not only enhances the overall sealing performance but also effectively blocks external electromagnetic interference and physical damage, ensuring the accuracy and stability of the internal testing process. Finally, a high-strength composite material is selected as the outermost layer, further strengthening the clamp's overall weather resistance and mechanical strength, maintaining a good seal even in harsh environments.

[0016] In this embodiment, a lead-shielded detection chamber was employed, with multiple shielding layers inside. These shielding layers are designed to effectively block the intrusion of external radiation, thereby reducing interference factors and improving the resolution and accuracy of the detection. Each shielding layer is made of lead of a specific thickness, capable of absorbing and weakening external electromagnetic radiation and rays, ensuring the purity and stability of the data during the detection process.

[0017] In this embodiment, a computing device with calibration function is employed. This device calculates the grease thickness in each region based on the Lambert-Beer law and the assumption of uniform isotope distribution in the grease. The grease concentration in each region can be deduced from the Lambert-Beer law formula, and then the grease thickness is calculated by combining the known isotope distribution and the geometry of the clamp. The calibration unit precisely corrects the X-ray count rate, ensuring that the count rate difference per unit is strictly controlled within 10% during detection within the clamp cavity. The X-ray count rate refers to the number of X-rays detected after passing through the clamp within a specific time period; it reflects the density and distribution of the grease inside the clamp.

[0018] A method for detecting the amount of grease injected into the cavity of a tension clamp using radioactive isotope tracers includes the following steps: preparing an electrostatic grease containing trace amounts of low-energy gamma-ray isotope tracers, wherein the activity of the low-energy gamma-ray isotopes is 0.1 μCi to 1 μCi; injecting the prepared electrostatic grease into the cavity of the tension clamp; sealing the tension clamp; placing the sealed tension clamp in a lead-shielded detection chamber; scanning the surface of the clamp using a gamma-ray detector and recording the gamma-ray count rate at each location; and applying Lambert-Beer's Law I / I0=e -εcl Based on the assumption that isotopes are uniformly distributed in the electrical grease, the grease thickness in each region of the clamp cavity is calculated using the recorded gamma ray count rate. The grease thickness in each region is then added together to obtain the total amount of grease injected into the clamp cavity. Through the above steps, a high-sensitivity detection of the amount of grease injected into the clamp cavity is achieved.

[0019] In this embodiment, a suitable tension clamp is first selected, ensuring sufficient space for grease injection. After grease injection into the tension clamp cavity, a multi-layer sealing method is employed. Specifically, a rubber sealing ring is used for initial sealing, followed by an outer metal sealing sleeve to further enhance the sealing effect. This double- or multi-layer sealing structure effectively isolates external environmental factors such as humidity and dust, ensuring the grease's condition remains unaffected. The low-energy gamma-ray isotope cobalt-57 is used for non-destructive testing of the grease filling within the tension clamp cavity. The activity range of this isotope is set to 0.1 μCi to 1 μCi. Low-energy gamma-ray cobalt-57 isotopes reduce radiation hazards to the surrounding environment and human body due to their low energy, while maintaining detection sensitivity. In practical applications, a source containing low-energy gamma-ray cobalt-57 isotopes is placed in one of the clamp's... On one side, after passing through the clamp material, the radiation will attenuate to varying degrees depending on the distribution of the grease. A gamma-ray detector is set on the other side to receive the intensity changes of the radiation after passing through the clamp. By analyzing the received data, the distribution and amount of grease in the cavity can be accurately determined. During the scanning process, the moving speed of the gamma-ray detector is adjusted to be between 0.1 m / s and 1.5 m / s. This speed range ensures the accuracy of the detection while avoiding detection efficiency problems or data distortion caused by being too fast or too slow. This method not only improves the resolution and accuracy of detecting the amount of grease in the cavity of the tension clamp, but also realizes non-destructive and non-contact measurement of the grease distribution inside the clamp. It can also repeatedly detect the same position to further verify the accuracy of the detection results. In actual operation, it can significantly reduce the interference of external environmental factors such as temperature and humidity on the detection results, ensuring the stability and reliability of the detection process. As a preferred embodiment, this method uses gamma-ray count rate to calculate the grease thickness in each region, and then sums the thickness values ​​of these regions to obtain the total grease injection volume, ensuring that the calculation error throughout the process is controlled within 5%. This method involves trace amounts of low-energy gamma rays contained in the grease penetrating the clamp and the grease itself before being received by a gamma-ray detector. The intensity of the rays decreases due to absorption as they pass through the grease layer, and the grease thickness in different regions can be calculated based on the change in the gamma-ray count rate. Specifically, the gamma-ray count rate is inversely proportional to the grease thickness; that is, the thicker the grease, the lower the intensity of the rays after passing through, and the lower the count rate. By calculating and analyzing the data from each detection point, the amount of grease in each region can be accurately calculated, and then these values ​​are accumulated to obtain the total grease injection volume.

[0020] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A system for detecting the amount of grease injected into the cavity of a tension wire clamp using radioactive isotope tracing, characterized in that, include: -Tracer preparation apparatus for preparing electro-ester containing trace amounts of low-energy gamma-ray isotope tracers; - Grease injection device, used to inject the prepared electrical grease into the cavity of the tension clamp; -A sealing device used to seal the tension clamp after grease injection; - Lead-shielded testing chamber, used to house sealed tension clamps; - A gamma-ray detector is used to scan the surface of the wire clamp and record the gamma-ray count rate at each location; - A computing device for calculating the gamma-ray count rate based on the Lambert-Beer law I / I0=e -εcl Assuming that the isotopes are uniformly distributed in the electrical grease, the grease thickness in each region within the clamp cavity is calculated, and the grease thickness in each region is summed to obtain the total grease injection amount.

2. A method for detecting the amount of grease injected into the cavity of a tension clamp using radioactive isotope tracing, characterized in that, Includes the following steps: - Prepare an electric ester containing trace amounts of a low-energy gamma-ray isotope tracer, wherein the activity of the low-energy gamma-ray isotope is 0.1 μCi to 1 μCi; - Inject the prepared electrical grease into the cavity of the tension clamp; - The tension clamp is sealed. - Place the sealed tension wire clamp inside the lead-shielded testing chamber; - The surface of the wire clamp is scanned using a gamma-ray detector, and the gamma-ray count rate at each location is recorded; According to Lambert-Beer's Law, I / I0 = e -εcl Based on the assumption that the isotopes are uniformly distributed in the electrical grease, the grease thickness in each region of the tension clamp cavity is calculated using the recorded gamma ray count rate, and the grease thickness in each region is added together to obtain the total amount of grease injected into the tension clamp cavity.

3. The detection method according to claim 2, characterized in that, The low-energy gamma-ray isotope is cobalt-57.

4. The detection method according to claim 2, characterized in that, The gamma-ray detector is a high-resolution sodium-iodine detector.

5. The detection method according to claim 2, characterized in that, The step of recording the gamma-ray count rate at each location also includes scanning the wire clamp multiple times at different locations and taking the average value as the final gamma-ray count rate.

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