A test method for testing the strength of cementing agent in disc-type suspension porcelain insulator

Abstract

This invention discloses a test method for testing the strength of cement adhesive in disc suspension porcelain insulators, relating to the field of power equipment testing technology. The specific steps of the test method are as follows: S100, cement adhesive extraction: cement adhesive with a length exceeding 45mm and a thickness greater than 3mm is extracted from the disc suspension porcelain insulator by hammering and cutting. This invention ensures the accuracy and reliability of the test results through meticulous step design and parameter control, including cement adhesive extraction, sample preparation, sample cleaning and drying, and calculation of bending and flexural strength. A series of operations, including diamond wire cutting, ultrasonic cleaning, and electric drying oven drying, not only improve the testing efficiency but also ensure the accuracy of the test data. In addition, the use of an electronic universal testing machine for bending and flexural strength testing can record load and displacement data in real time, providing a method for accurate quantification of cement adhesive strength.

Description

Technical Field

[0001] This invention relates to the field of power equipment testing technology, specifically a test method for testing the strength of cement adhesive in disc suspension porcelain insulators. Background Technology

[0002] Disc suspension porcelain insulators are crucial components in power systems, widely used in transmission lines, playing a key role in electrical insulation and mechanical support. Their performance stability and reliability directly affect the safe operation of the power system. Cement adhesive, as the core connecting material of disc suspension porcelain insulators, has strength characteristics that are crucial to the overall performance of the insulator. Therefore, accurate testing of cement adhesive strength is not only an important indicator for evaluating the quality of insulators, but also a key link in ensuring the stable operation of the power system. With the rapid development of the power industry and the continuous advancement of technology, higher requirements have been placed on the testing methods for cement adhesive strength.

[0003] Traditional methods for testing the strength of cement adhesives have many shortcomings. On the one hand, traditional methods often focus on simple mechanical performance tests, lacking comprehensiveness and accuracy, and are difficult to truly reflect the performance of cement adhesives in actual working environments. On the other hand, traditional testing methods are cumbersome, time-consuming, and easily affected by human factors, resulting in unstable and poor repeatability of test results. In addition, traditional methods lack in-depth research on the performance changes of cement adhesives under long-term loads, making it difficult to meet the current power industry's demand for high-performance insulators. Therefore, there is an urgent need for a more advanced, accurate, and comprehensive testing method to overcome the limitations of traditional methods.

[0004] Therefore, developing a test method for testing the strength of cement adhesive in disc suspension porcelain insulators will help improve the accuracy of reliability and durability assessment of porcelain insulators, and provide strong support for the safe and stable operation of power systems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a test method for testing the strength of cement adhesive in disc suspension porcelain insulators. This method covers the entire process from sample extraction and preparation to cleaning and drying, and then to the calculation of flexural and bending strength. Precise cutting techniques and rigorous cleaning and drying procedures ensure the accuracy and consistency of the samples. Using an electronic universal testing machine for flexural strength testing, combined with specific calculation formulas, the flexural performance of cement adhesive under long-term loads can be scientifically and accurately evaluated. This not only improves the accuracy and efficiency of the test but also provides strong technical support for the quality control and safety performance evaluation of disc suspension porcelain insulators.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a test method for testing the strength of cement adhesive in disc-type suspension porcelain insulators, the specific steps of which are as follows:

[0007] S100, Cement Adhesive Extraction: Cement adhesive with a length exceeding 45mm and a thickness exceeding 3mm is extracted from disc-shaped suspension porcelain insulators by hammering and cutting.

[0008] S200, Sample preparation: Wrap diamond wire around the drive wheel and auxiliary wheel, fix the sample to the pad with hot melt adhesive, finely adjust the position and angle of the diamond wire for cutting, supply 1-2L / min of circulating cooling oil during cutting, and make the cement adhesive into a sample.

[0009] S300, Sample cleaning and drying: Place the cut strip sample into a glass beaker containing anhydrous ethanol, ensuring the ethanol level covers the sample. Place the beaker into an ultrasonic cleaner and pour in tap water until the water level exceeds the sample level. Clean at 40°C for 5–8 minutes. Remove the sample and clean it with deionized water at least 3 times. Place the cleaned sample into an electric drying oven and dry it at 60±5°C. After drying to constant weight, place it in a desiccator to cool to room temperature.

[0010] S400, flexural strength test calculation: an electronic universal testing machine was selected, the span between the two lower points was set to 40mm, the crossbeam displacement speed was set to 0.5mm / min, the treated sample was placed on the three-point bending test device, the testing machine was started and loaded until the sample broke, the load and displacement data were recorded in real time, and the flexural strength of the cement adhesive under load was calculated.

[0011] Further, in S200, the steps for extracting cement adhesive in sample preparation are as follows: gently tap the insulator skirt with a hammer to dislodge it, fix the porcelain head with a vise, cut the steel cap with an angle grinder, fix the remaining porcelain head in the jaws of the cutting machine, push it towards the diamond saw blade for cutting, fix the cement adhesive near the steel foot in the cutting chamber again, and repeat the above cutting operation to obtain cement adhesive.

[0012] Furthermore, in S200, the hot melt adhesive used in sample preparation has a melting point of 120-150℃ and a thickness of 0.5-1mm.

[0013] Furthermore, in S200, the sample size requirements during sample preparation are as follows: length L ≥ 45 mm, tolerance 0.2 mm; width B 4-6.5 mm, tolerance 0.2 mm; thickness D 2-3 mm, tolerance 0.1 mm; longitudinal surface parallelism tolerance 0.015 mm.

[0014] Furthermore, in S200, the cutting speed set during sample preparation is ≤0.6mm / min.

[0015] Furthermore, in S300, the power of the ultrasonic cleaner during sample cleaning and drying is set to 300-500W, the frequency to 40-60kHz, the temperature to 40℃, and the cleaning time to 5-8min.

[0016] Furthermore, in S300, the temperature of the electric heating drying oven during sample cleaning and drying is set to 60±2℃, and the hot air circulation speed is 0.5-1m / s.

[0017] Furthermore, in the S400 calculation of flexural strength, the flexural strength of the cement adhesive under long-term load is calculated using the flexural strength formula for porcelain insulator adhesive. The formula is: Where R is the flexural strength, F is the failure load, L is the span, b is the specimen width, and h is the specimen thickness.

[0018] Compared with existing technologies, this test method for testing the strength of cement adhesive in disc suspension porcelain insulators has the following advantages:

[0019] I. This invention, through meticulous step design and parameter control, including the extraction of cement adhesive, sample preparation, sample cleaning and drying, and calculation of flexural strength, ensures the accuracy and reliability of test results. A series of operations, including diamond wire cutting, ultrasonic cleaning, and electric drying oven drying, not only improve testing efficiency but also guarantee the accuracy of test data. Furthermore, the use of an electronic universal testing machine for flexural strength testing allows for real-time recording of load and displacement data, providing a method for the precise quantification of cement adhesive strength.

[0020] II. This invention, by optimizing the testing process and improving testing accuracy, achieves rapid and accurate testing of the strength of cement adhesive in disc suspension porcelain insulators. It is not only simple to operate and highly practical, but also possesses a high degree of automation. It can be widely applied to the strength testing of cement adhesive inside porcelain insulators in various transmission lines. Furthermore, the testing method of this invention has high sensitivity, enabling timely detection of changes in cement adhesive strength, thus providing strong protection for the safe operation of transmission lines. Therefore, it has high practical application value and is of great significance for promoting the development and progress of the transmission line industry.

[0021] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0023] Figure 1 A flowchart of a test method for testing the strength of cement adhesive in disc suspension porcelain insulators;

[0024] Figure 2 This is a flowchart outlining a test method for assessing the strength of cement adhesive in disc-type suspension porcelain insulators. Detailed Implementation

[0025] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0026] Example 1

[0027] At the quality inspection center of a large insulator manufacturing company, a new batch of disc suspension porcelain insulators, model XWP-70, was recently produced. To ensure product quality, the strength of their cement adhesive was tested.

[0028] Cement adhesive extraction (S100): Five samples were randomly selected from this batch of newly produced insulators. The testing personnel first put on goggles and gloves for protection. They then used a rubber hammer to gently tap along the edge of the insulator skirt, controlling the force to remove the skirt without damaging the internal structure. After the operation, the skirt was successfully removed. Next, the porcelain head part with the skirt removed was clamped in a vise bench clamp. The jaws of the vise were padded with soft rubber pads to prevent damage to the porcelain head. An angle grinder with a special cutting disc was used to slowly cut along the edge of the steel cap at a speed of 3000-3500 rpm. During the cutting process, the cutting area was continuously wiped with a damp cloth to cool it down and avoid the temperature from being too high and affecting the performance of the cement adhesive. The steel cap was successfully peeled off.

[0029] Next, fix the remaining ceramic head in the clamp of the manual / automatic cutting machine, carefully adjust the clamp position to ensure that the central axis of the ceramic head is perpendicular to the cutting saw blade. Before starting the cutting machine, check the firmness of the diamond saw blade installation, and at the same time open the cutting water valve, controlling the water flow rate at 2-3L / min to ensure that the saw blade is fully cooled and rinsed. During cutting, slowly push the sample towards the saw blade at a speed of 0.5-0.8mm / s, closely monitor the cutting process to prevent the saw blade from jamming or the sample from breaking. When the ceramic part is completely peeled off, only the steel foot and the attached cement adhesive remain. Fix the cement adhesive near the steel foot in the cutting chamber and repeat the above cutting operation. The cement adhesive with a length of more than 45mm and a thickness of more than 3mm was successfully extracted. After extraction, turn off the power of the cutting machine and clean up the debris and wastewater in the cutting area.

[0030] Sample Preparation (S200): Before the cutting operation, the operator thoroughly cleans the working area of ​​the diamond wire cutting machine, wiping away dust and oil stains on the surface of the equipment with a clean cloth to ensure a clean operating environment. Following the instructions in the equipment manual, the diamond wire is wound sequentially onto the drive wheel and auxiliary wheel. During winding, the diamond wire must be kept taut and free of twisting, and its direction must be consistent with the drive wheel's direction. A hot melt adhesive with a melting point of 130℃ is selected and evenly applied to the pad using a hot melt glue gun. The application area should be slightly larger than the bottom area of ​​the sample, and the adhesive thickness should be controlled at 0.75mm. The extracted cement adhesive sample is carefully adhered to the pad, gently pressed to ensure full contact between the sample and the hot melt adhesive, and allowed to wait 5-8 minutes until the hot melt adhesive has completely cooled and solidified, firmly fixing the sample to the pad.

[0031] Install the sample-fixed pad onto the worktable of the diamond wire cutting machine. Adjust the pad's position so that the sample is centered in the cutting area. Load the diamond wire onto the cutting machine, securing both ends firmly to the tensioning reels. Adjust the tension using the tensioning device to achieve the recommended tension value. Turn on the cutting machine and set the cutting speed to 0.5 mm / min via the control panel. Simultaneously, start the circulating cooling oil supply system, controlling the oil flow rate at 1.5 L / min to ensure the diamond wire is adequately cooled during cutting and prevent breakage due to overheating. Once everything is confirmed to be ready, start the cutting process. The machine begins cutting. During the cutting process, the operator checks the cutting progress and the condition of the diamond wire every 1-2 minutes to ensure a stable cutting speed and prevent any abnormalities such as wire jamming or breakage. After cutting, a cement adhesive sample that meets the dimensional requirements is obtained, with a length L of 45.2 mm (tolerance within 0.2 mm), a width B of 5.2 mm (tolerance of 0.2 mm), a thickness D of 2.4 mm (tolerance of 0.1 mm), and a longitudinal surface parallelism tolerance of 0.015 mm. After cutting, the power to the cutting machine is turned off, the work area is cleaned, and the cutting debris is collected and disposed of.

[0032] Sample cleaning and drying (S300): Carefully place the cut sample into a glass beaker containing anhydrous ethanol, ensuring the ethanol level is approximately 3 cm above the sample. Place the beaker into the cleaning tank of an ultrasonic cleaner, and pour in tap water until the water level is above the sample. Turn on the power and set the ultrasonic cleaner to 400W, 50kHz, and 40℃, with a cleaning time of 7 minutes. During the cleaning process, the ultrasonic cleaner generates high-frequency vibrations, creating a strong cavitation effect between the anhydrous ethanol and deionized water, effectively removing impurities and debris from the sample surface. After cleaning, carefully remove the sample with tweezers and rinse it 5 times with deionized water, immersing the sample in deionized water for 2-3 minutes each time and gently shaking it to ensure thorough cleaning.

[0033] The cleaned sample was placed in an electric drying oven. The temperature of the oven was set to 60℃ and the hot air circulation speed was adjusted to 0.8m / s. During the drying process, the sample was taken out and weighed every 30 minutes. When the difference between two consecutive weighings was ≤0.005g, it indicated that the sample had been dried to a constant weight. After drying, the sample was placed in a desiccator with color-changing silica gel desiccant inside to ensure a dry internal environment. The sample was allowed to cool to room temperature.

[0034] Calculation of bending and flexural strength (S400): A high-precision electronic universal testing machine was selected for testing. Before testing, the power of the testing machine was turned on to ensure stable operation of the equipment. At the same time, the matching computer operation software was opened. In the software interface, the span between the two lower points was set to 40mm and the displacement speed of the crossbeam was set to 0.5mm / min. The standard GB / T6569-2006 "Test Method for Bending Strength of Fine Ceramics" was selected as the test basis. The sample cooled to room temperature was carefully placed on the fulcrum of the three-point bending test device. The position of the sample was adjusted so that it was horizontal and located at the center of the fulcrum. The lifting rod was adjusted so that the lifting rod was 2-3mm away from the sample. Then the force value and displacement items on the software interface were cleared to zero.

[0035] Once ready, click the "Start Test" button on the software interface to start the testing machine. During loading, the machine's crossbeam slowly descends at a set speed, applying pressure to the specimen. The specimen gradually bends and deforms. Closely monitor the test process, observing the specimen's deformation and the equipment's operating status in real time. When the specimen breaks, the testing machine automatically stops loading, and the software interface displays the failure load data. After the test, the software automatically calculates the flexural strength of the cement adhesive using the flexural strength formula based on the input parameters and test data. The formula is: Where R is the flexural strength, F is the failure load, L is the span, b is the sample width, and h is the sample thickness, a test curve and a test report are generated, and the test results of the 5 samples are statistically analyzed to calculate the average value and standard deviation. Finally, the flexural strength evaluation results of this batch of insulator cement adhesive under long-term load are obtained, which provides an important basis for product quality judgment.

[0036] In summary, during the testing of the newly produced XWP-70 disc suspension porcelain insulators, the cement adhesive strength test was successfully completed through a standardized and meticulous operating procedure. Suitable cement adhesive was precisely extracted from the insulators, and samples were carefully prepared using a diamond wire cutter. After cleaning and drying, the samples were rigorously tested according to standards on an electronic universal testing machine, and the flexural strength was accurately calculated. Strict control of parameters at each stage ensured the accuracy and reliability of the test results. This not only provides strong data support for the quality of this batch of products but also points the way for quality monitoring and improvement in subsequent production processes, ensuring the stable operation of the products in transmission lines.

[0037] Example 2

[0038] In the laboratory of a company specializing in insulator research and development, a new type of disc-shaped suspension porcelain insulator has been developed. To evaluate the performance of its cement adhesive, the first batch of newly produced samples were subjected to strength tests.

[0039] Cement adhesive extraction (S100): Three samples were selected from the first batch of 10 new insulator samples for testing. The testing personnel first laid a protective mat on the operating table to prevent additional damage to the insulators during operation. A wooden hammer was used to gently tap the insulator skirts with even and moderate force to facilitate their removal. The porcelain head with the skirt removed was then fixed in a vise, ensuring its horizontal position. An angle grinder was used to cut the steel cap at a speed of 3200-3400 rpm. During cutting, a small amount of water was continuously dripped onto the cutting area to cool it and prevent localized overheating. After successfully removing the steel cap, the remaining... The ceramic head is fixed in the jaws of the manual / automatic cutting machine. The wear of the diamond saw blade is carefully checked to ensure that the blade is sharp and free of cracks. The water supply valve is opened, and the water flow rate is controlled at about 2.5L / min. The cutting machine is started, and the sample is slowly pushed towards the saw blade at a speed of 0.6-0.7mm / s for cutting. During the cutting process, the cutting situation is closely monitored through the observation window to ensure that the cutting is stable. After the ceramic part is separated, the cement adhesive near the steel foot is fixed and cut again. The cement adhesive with a length of more than 45mm and a thickness of more than 3mm is successfully extracted. After the extraction is completed, the cutting machine is turned off, and the residue and wastewater in the cutting area are cleaned up.

[0040] Sample Preparation (S200): Before cutting, thoroughly clean the working area of ​​the diamond wire cutting machine. Use a cleaning agent to remove oil and impurities from the surface of the equipment, then rinse it with clean water and dry it. Follow the correct operating procedure to wind the diamond wire onto the drive wheel and auxiliary wheel, ensuring that the diamond wire tension is appropriate and the winding is neat. Select a hot melt adhesive with a melting point of 135℃, and use a hot melt glue gun to evenly apply the hot melt adhesive onto the customized pad. Control the adhesive thickness to about 0.7mm. Smoothly paste the extracted cement adhesive sample onto the pad, gently press it down, and allow the hot melt adhesive to fully cure, so that the sample is firmly fixed on the pad.

[0041] Install the sample-fixed pad onto the worktable of the diamond wire cutting machine. Adjust the pad position precisely using the knob to ensure the sample is in the optimal cutting position. Install the diamond wire onto the cutting machine, fixing both ends to the tensioning reels. Fine-tune the tension to achieve the appropriate working condition for the diamond wire. Turn on the cutting machine and set the cutting speed to 0.4 mm / min. Start the circulating cooling oil supply system, controlling the oil flow rate at 1.6 L / min. After confirming the equipment parameters are correct, start the cutting machine. During the cutting process, check the diamond wire's condition every 5-10 minutes to ensure normal cutting. After cutting, obtain a cement adhesive sample that meets the dimensional requirements: length L = 45.4 mm (meeting the 0.2 mm tolerance), width B = 5.8 mm (tolerance 0.2 mm), thickness D = 2.6 mm (tolerance 0.1 mm), and longitudinal surface parallelism tolerance = 0.015 mm. After cutting, turn off the cutting machine and clean the work area.

[0042] Sample cleaning and drying (S300): Place the cut sample into a glass beaker containing anhydrous ethanol, with the ethanol level about 2.5 cm above the sample. Place the beaker into an ultrasonic cleaner, pour in tap water so that the water level is above the sample in the beaker, turn on the power, set the ultrasonic cleaner power to 450W, frequency to 55kHz, temperature to 40℃, and cleaning time to 6 minutes. After cleaning, remove the sample with tweezers, rinse it 6 times with deionized water, soaking it for 3 minutes each time and gently shaking the sample.

[0043] The cleaned sample was placed in an electric drying oven. The temperature of the electric drying oven was set to 58℃ and the hot air circulation speed was adjusted to 0.9m / s. During the drying process, the sample was weighed every 40 minutes until the difference between two weighings was ≤0.005g. After drying, the sample was placed in a desiccator with sufficient color-changing silica gel desiccant and allowed to cool to room temperature.

[0044] Calculation of bending and flexural strength (S400): A high-sensitivity electronic universal testing machine was selected for testing. Before the test, the power supply of the testing machine and the computer operating software were turned on. In the software, the span between the two lower points was set to 40 mm and the displacement speed of the crossbeam was set to 0.5 mm / min. The standard GB / T6569-2006 "Test Method for Bending Strength of Fine Ceramics" was selected. The cooled sample was carefully placed on the support of the three-point bending test device. The lifting rod was adjusted to a distance of 2.5 mm from the sample. The force value and displacement data on the software interface were cleared.

[0045] Clicking the "Start Test" button in the software initiates the loading process. During the test, staff continuously monitor the deformation of the specimen. When the specimen breaks, the testing machine stops loading, and the software records the failure load data. After the test, the software calculates the flexural strength of the cement adhesive using the flexural strength formula based on the input parameters and test data. The formula is: Test curves and reports are generated, the test results of three samples are analyzed, the average value and dispersion are calculated, and the flexural strength performance of the new insulator cement adhesive under long-term load is evaluated, providing data support for further product optimization.

[0046] In summary, this embodiment fully presents the testing process for the cement adhesive strength of the new disc-shaped suspension porcelain insulator. From sample selection to cement adhesive extraction, from sample preparation to cleaning, drying, and final strength testing, each step follows rigorous scientific operating procedures. During the operation, attention was paid to detail, and various parameters were strictly controlled, effectively reducing errors. Analysis of the test data provides a clear understanding of the performance of the cement adhesive in the new insulator, offering crucial information for the research and optimization of the new insulator. This helps improve product design and manufacturing processes, enhance product performance, make it more suitable for the actual needs of power transmission, and promote technological progress in the insulator industry.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A test method for testing the strength of a cementing agent in a disc-shaped suspension porcelain insulator, characterized in that, The specific steps of this experimental method are as follows: S100, Cement Adhesive Extraction: Cement adhesive with a length exceeding 45mm and a thickness exceeding 3mm is extracted from disc-shaped suspension porcelain insulators by hammering and cutting. S200, Sample preparation: Wrap diamond wire around the drive wheel and auxiliary wheel, fix the sample to the pad with hot melt adhesive, finely adjust the position and angle of the diamond wire for cutting, supply 1-2L / min of circulating cooling oil during cutting, and make the cement adhesive into a sample. S300, Sample cleaning and drying: Place the cut strip sample into a glass beaker containing anhydrous ethanol, ensuring the ethanol level covers the sample. Place the beaker into an ultrasonic cleaner and pour in tap water until the water level exceeds the sample level. Clean at 40°C for 5–8 minutes. Remove the sample and clean it with deionized water at least 3 times. Place the cleaned sample into an electric drying oven and dry it at 60±5°C. After drying to constant weight, place it in a desiccator to cool to room temperature. S400, flexural strength test calculation: an electronic universal testing machine was selected, the span between the two lower points was set to 40mm, the crossbeam displacement speed was set to 0.5mm / min, the treated sample was placed on the three-point bending test device, the testing machine was started and loaded until the sample broke, the load and displacement data were recorded in real time, and the flexural strength of the cement adhesive under load was calculated.

2. A test method for testing the strength of a cementing agent in a disc-type suspension porcelain insulator according to claim 1, characterized in that, In S100, the steps for extracting cement adhesive are as follows: gently tap the insulator skirt with a hammer to dislodge it, fix the porcelain head with a vise, cut the steel cap with an angle grinder, fix the remaining porcelain head in the jaws of the cutting machine, push it towards the diamond saw blade for cutting, fix the cement adhesive near the steel foot in the cutting chamber again, and repeat the above cutting operation to obtain cement adhesive.

3. A test method for testing the strength of a cementing agent in a disc-type suspension porcelain insulator according to claim 1, characterized in that, In the S200 sample preparation, the hot melt adhesive is selected with a melting point of 120-150℃ and the thickness is controlled at 0.5-1mm.

4. A test method for testing the strength of a cementing agent in a disc-type suspension porcelain insulator according to claim 1, characterized in that, For the S200 sample preparation, the sample size requirements are as follows: length L≥45mm, tolerance 0.2mm; width B4-6.5mm, tolerance 0.2mm; thickness D2-3mm, tolerance 0.1mm; longitudinal surface parallelism tolerance 0.015mm.

5. The test method for testing the strength of cement adhesive in a disc-type suspension porcelain insulator according to claim 1, characterized in that, In S200, the cutting speed set during sample preparation is ≤0.6mm / min.

6. The test method for testing the strength of cement adhesive in a disc-type suspension porcelain insulator according to claim 1, characterized in that, In the S300, the power of the ultrasonic cleaner during sample cleaning and drying is set to 300-500W, the frequency to 40-60kHz, the temperature to 40℃, and the cleaning time to 5-8min.

7. A test method for testing the strength of a cementing agent in a disc-type suspension porcelain insulator according to claim 1, characterized in that, In the S300, the temperature of the electric heating drying oven during sample cleaning and drying is set at 60±2℃, and the hot air circulation speed is 0.5-1m / s.

8. A test method for testing the strength of a cementing agent in a disc-type suspension porcelain insulator according to claim 1, characterized in that, The S400, the bending strength test calculates the bending strength of the cement adhesive under long-term load by the porcelain insulator adhesive bending formula, and the formula is: Wherein R is the bending strength, F is the failure load, L is the span, b is the sample width, and h is the sample thickness.

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