Device and method for rapidly evaluating service life of electrode needle for voltage-sharing electrode

Abstract

The invention discloses a device and a method for quickly evaluating the service life of an electrode needle for a voltage-sharing electrode, which can accurately simulate the service condition of a sample piece under the action of a radial variable load, and the test result is more in line with the actual condition than the condition reflected by a circumferential tensile test and a radial shear test. The evaluation of the operation condition of the sample in the environment is more reliable and more reasonable, and the conformity with the actual operation condition is better. And an available and reliable testing device and method are provided for sample material selection under the fluid impact environment condition and evaluation and comparison of the service life of a test piece. Corresponding evaluation tests can be carried out on test pieces with different lengths in principle; the selected material and the processed sample piece thereof evaluated by the method are reliable to use, the safe operation of the system is ensured, the cost is saved, and the significance is great. According to the invention, samples prepared from selected materials can be tested independently without comparison.

Description

Technical Field

[0001] The present invention relates to the technical field of electrode needle specimens for voltage equalizing electrodes, and particularly relates to a device and method for rapidly evaluating the service life of electrode needles for voltage equalizing electrodes. Background Art

[0002] The voltage equalizing electrode is an important part of the converter valve in the power system, and is mainly installed on the main water inlet and outlet pipelines of the valve tower and the branch water pipelines of the valve segments in each valve layer. A typical voltage equalizing electrode includes a base and a specimen. The base mainly ensures the fixation of the specimen and the installation of the voltage equalizing electrode in the water circuit. The specimen is the core unit for realizing the function of the voltage equalizing electrode. The voltage equalizing electrode extends into the water pipe through the specimen, so as to maintain the equal potential between the valve segment water circuits, avoid the occurrence of potential difference in the water circuit, and thus ensure the safe and effective operation of the system.

[0003] There are differences in the connection of valve components provided by different equipment manufacturers, but most of them use a large number of voltage equalizing electrodes. Some use hundreds of long and short specimens for the positive and negative electrodes (bipolar), and at present, the vast majority of specimens in the industry are made of pure platinum materials. In actual use, it is found that the specimens of voltage equalizing electrodes in many domestic power stations have been damaged to varying degrees. Some have been bent and twisted, and some have broken. Moreover, it is often difficult to retrieve the broken specimens, resulting in great losses. After inspection and analysis, it is found that the cooling water in the pipeline has an impact on the voltage equalizing specimen, causing it to bend, twist and break. The breakage of the specimen causes the voltage equalizing electrode to lose its due protection function. After comparison, it is found that the number of imported voltage equalizing specimens broken during use is significantly lower than that of domestic specimens. There are obvious differences in the bending, twisting and breaking conditions of specimens from different domestic manufacturers after operation, and there are also large differences in the operation of voltage equalizing electrodes provided by the same manufacturer. At present, most manufacturers in the industry use the method of tensile testing of specimens to measure their tensile strength and yield strength, and accordingly judge the level of their performance and possible service life. There are also a few units that have improved this method and used the shear strength under radial force to evaluate the specimens for voltage equalizing electrodes. Nevertheless, there is still a gap between the above two methods and the actual application conditions of the electrodes.

[0004] Since the service life of the specimen generally determines that of the grading electrode, and the fracture of the specimen during use is not caused by axial loading but by the impact of water flow in the radial direction. The specimen undergoes elastic deformation or even elastoplastic deformation under the impact of water flow, causing the specimen to vibrate reciprocally. After running for a certain period of time, the specimen undergoes bending and torsion or fracture. This water flow impact is controlled by the temperature of the cooling water and the loading frequency of the pump. When the temperature is slightly higher than the requirement, the motor starts automatically, injecting cooling water into the pipeline for cooling. This change in water flow caused by the injection of cooling water and the change in the motor loading frequency will have a certain impact on the specimen on the grading electrode in the pipeline, which to some extent belongs to the action of alternating load. Obviously, there is a certain deviation between the evaluation of the specimen using the simple tensile test results and the actual situation. Even after improvement, the results of the shear test are also different from the actual alternating load action. Therefore, designing and developing a device and method for quickly evaluating the service life of the specimen on the grading electrode not only has a more reasonable evaluation of the specimen used, and then determines the specimen that meets the requirements, but also can save the time for replacing the grading electrode, save materials and operating costs, and better ensure the safe and reliable operation of the converter valve system, which is of great significance. Summary of the Invention

[0005] In order to solve the above problems, the present invention aims to provide a device and method for quickly evaluating the service life of the electrode needle used in the grading electrode, so as to achieve the purpose of quickly testing whether the specimen used in the grading electrode meets the requirements.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A device for quickly evaluating the service life of the electrode needle used in the grading electrode includes a specimen fixing system, a power system, a loading system, a sensor system, and a control module. The loading system includes a limit sleeve and a push rod arranged in the limit sleeve and movable in the limit sleeve. A limit hole is provided on the limit sleeve. The two ends of the specimen are respectively arranged on the specimen fixing system and in the limit hole. The power system is used to drive the push rod to move in the limit sleeve and load the specimen. The sensor system real-time feedbacks the pressure load direction and load magnitude of the push rod on the specimen during the movement process, and can perform linkage control with the control module through the maximum load and its set change amount.

[0008] Preferably, the power system includes a variable frequency speed regulating motor, an eccentric wheel arranged at the output end of the variable frequency speed regulating motor, and an adjustable connecting rod matched with the eccentric wheel. The adjustable connecting rod is connected to the push rod, and the adjustable connecting rod drives the push rod to perform reciprocating up and down movements.

[0009] Preferably, the loading system further includes an adjusting nut, and the adjusting nut is used to adjust the distance of the reciprocating up and down movement of the push rod.

[0010] Preferably, the sensor system includes a sensor disposed at the end of the ejector rod, a signal transmission line, and built-in control software, and the signal transmission line is respectively connected to the control module and the interface of the built-in control software system.

[0011] Preferably, the control module includes a control and display panel, a load control display, a load application times display, a frequency display, a frequency adjustment knob, a power-off button, a power-on button, and a power cord; the load control instrument can be used to increase and decrease the maximum load setting and adjustment, and can real-time display the load application method and magnitude during the operation process, and is linked with the sensor, the power-off button, and the power-on button for control; the load application times display is used to display the load application times in the test stage, and one up-and-down reciprocation is recorded as one number, and so on, and the maximum display number can reach 99999999; the frequency display is used to display the load application frequency of the variable-frequency speed-regulating motor during the test process; the frequency adjustment knob can adjust the frequency, thereby adjusting the speed of the variable-frequency speed-regulating motor.

[0012] Preferably, the specimen fixing system includes a specimen support rod with a through hole formed in the upper part, a specimen clamping and fixing end disposed in the through hole, and a specimen fixing base disposed outside the through hole and connected to the specimen clamping and fixing end, and the specimen is connected to the specimen clamping and fixing end.

[0013] Preferably, the specimen fixing system includes a specimen support rod with a through hole formed in the upper part and a specimen positioning screw inserted into the top of the specimen support rod and penetrating into the inside of the through hole, and the specimen is disposed in the through hole and is fixed by pressing with the specimen positioning screw.

[0014] Preferably, the specimen support rod is telescopic and movable.

[0015] Preferably, the specimen material is pure Pt, pure Pd, or pure Ag, or a metal or alloy with a surface layer plated with one or more noble metal layers such as Au, Pt, Pd, and Ru.

[0016] A method for rapidly evaluating the service life of an electrode needle used for a pressure equalizing electrode, comprising the following steps:

[0017] Select a specimen and fix it;

[0018] Perform corresponding parameter settings according to the actual environmental conditions of the intended work, including the effective length of the specimen, the maximum applied load, the applied frequency, and the reciprocating movement distance;

[0019] After setting the specimen that meets the requirements according to the conditions, perform a test, measure the number of applied loads until fracture, and thus obtain the service life of the specimen used for the pressure equalizing electrode.

[0020] The present invention has achieved the following technical effects compared with the prior art:

[0021] The method of the present invention can accurately simulate the service conditions of the sample under the action of radial variable load. The test results are more in line with the actual situation than those reflected by circumferential tensile tests and radial shear tests. Using this as an evaluation of the operation of the sample in the environment is more reliable and reasonable, and better conforms to the actual operating conditions. It also provides a usable and reliable test device and method for material selection of samples in a fluid impact environment and comparison of the service life of test pieces. In principle, corresponding evaluation tests can be carried out on test pieces of different lengths. The materials and their processed samples selected and matched through this method are reliable in use, ensuring the safe operation of the system, saving costs, and having great significance. The present invention can also test the selected material samples alone without comparison. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Appendix Figure 1 is a schematic structural diagram of the present invention;

[0024] Appendix Figure 2 is a schematic structural diagram of the screw fixing method and the sample fixing system of the present invention;

[0025] Appendix Figure 3 is a schematic structural diagram of the clamping and fixing end fixing method and the sample fixing system of the present invention;

[0026] Among them, 1. Loading control display; 2. Loading times display; 3. Frequency display; 4. Frequency adjustment knob; 5. Power off button; 6. Power on button; 7. Power cord; 8. Power system; 9. Sensing system; 10. Adjusting nut; 11. Thrust rod; 12. Loading system; 13. Sample; 14. Sample positioning screw; 15. Sample fixing system; 16. Sample support rod; 17. Signal transmission line; 18. Control and display panel; 19. Sample fixing base; 20. Sample clamping and fixing end. Detailed Embodiments

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide a device and method for quickly evaluating the service life of electrode needles used for voltage equalizing electrodes, so as to achieve the purpose of quickly testing whether the specimens used for voltage equalizing electrodes meet the requirements.

[0029] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Reference Figure 1, a device for rapidly evaluating the service life of electrode needles used in equalizing electrodes, comprising a specimen fixing system, a power system, a loading system, a sensor system, and a control module. The loading system includes a limit sleeve and a push rod disposed within the limit sleeve and movable within the limit sleeve. The limit sleeve is provided with a limit hole, and both ends of the specimen are respectively disposed on the specimen fixing system and within the limit hole. The power system is used to drive the push rod to move within the limit sleeve and load the specimen. The sensor system real-time feedbacks the pressurizing load direction and load magnitude on the specimen during the movement of the push rod, and can be linked with the control module through the maximum load and its set change amount; the device for rapidly evaluating the service life of specimens for equalizing electrodes involved in the present invention has a power system that uses a variable-frequency speed-regulating motor and realizes the reciprocating movement of the push rod through an eccentric wheel system. When reciprocating, the set maximum load is set by adjusting the up-and-down movement distance of the adjusting nut and the load adjustment button of the loading control display. The up-and-down movement of the adjusting nut is used to adjust the pressure when the push rod contacts the specimen, that is, the pressure load is adjusted by the distance adjusted by the nut, so that the set maximum load matches the maximum load received by the specimen in the use environment. When the push rod moves upward away from the balance position of the test specimen (load display is 0), it is a positive load. When the push rod moves downward away from the balance position of the test specimen, it is a negative load. Completing one up-and-down load is one cycle, and the load cycle display is the number of load cycles during the operation process. When the specimen breaks, the number in the load cycle display remains unchanged, and this value indirectly reflects the load cycle number, that is, the life, of the specimen under the test conditions. By comparing the test results of different specimens, the service life of the specimens can be compared, thereby providing a reliable theoretical and quantitative basis for the selection of specimens in the use environment. Before the test, the specimen must be in accordance with the dimensions in the actual use environment, that is, length, cross-sectional dimension / diameter, and surface finish requirements. During the test, the distance from the left end of the fixed end of the specimen to the free end is the same as the outer extension length of the specimen after the equalizing electrode is installed. During the test process, the specimen cannot shake at the fixed end. For all specimens in the same environment, the test operation parameters and specimen requirements are the same; the method of the present invention can accurately simulate the service conditions of the specimen under the action of radial variable load, and its test results are more in line with the actual situation than those reflected by circumferential tensile tests and radial shear tests. Therefore, it is more reliable and reasonable to use this as an evaluation of the operation of the specimen in the environment, and it has better compliance with the actual operation conditions. It also provides a usable and reliable test device and method for specimen material selection and specimen service life comparison under environmental conditions with fluid impact. In principle, corresponding evaluation tests can be carried out on specimens of different lengths. The materials and processed specimens selected and matched through this method are reliable in use, ensuring the safe operation of the system, saving costs, and having great significance.

[0031] Furthermore, the sensor system includes a sensor arranged at the end of the push rod, a signal transmission line and a built-in control software, and the signal transmission line is respectively connected to the control module and the built-in control software system interface.

[0032] refer to Figure 1 The control module includes a loading control display, a loading times display, a frequency display, a frequency adjustment knob, a power off button, a power on button, and a power cord; the loading control display is used to adjust the loading load and the display of the real-time load during operation (when the display changes, a "-" sign before the data indicates reverse loading, and no sign indicates forward loading), and can export the load spectrum data during operation through the interface. The button indicates that the maximum load can be set and adjusted. Indicates that the set load increases. Indicates that the set load is reduced. ▽ is the setting button. Press ▽ and then press The load setting can be adjusted. The loading times display instrument can effectively display the number of reciprocating loadings during operation, and indirectly reflect the test operation life of the electrode needle under the set conditions. The frequency display instrument directly controls the speed of the variable frequency speed regulating motor by adjusting the frequency through the frequency adjustment knob, and can display the frequency during operation. The higher the frequency, the faster the speed, and the lower the frequency, the slower the speed.

[0033] During the test, the specimens that may be used in the actual environment will be installed and effectively fixed, and the corresponding parameters will be set according to the actual environmental conditions to be worked, including the effective length of the specimen (electrode needle), the maximum load, the loading frequency, and the reciprocating movement distance (amplitude). The electrode needle that meets the requirements will be tested according to the conditions set, and the number of loads (life) it withstands until it breaks will be measured. Then the electrode needle that is intended to operate in the same environment will be tested under the same conditions, and the number of loads it withstands will be obtained in the same way. The number of loads they withstand will be compared and a reasonable judgment will be made. Of course, this device can also be used to test the number of loads that electrode needles for different equalizing electrodes, including equalizing electrodes from different manufacturers or electrode needles used for equalizing electrodes prepared by different methods from the same manufacturer, can withstand, so as to compare the life / performance of different electrode needles and make effective and reasonable evaluations and selections of electrode needles for the corresponding application environments.

[0034] The size of the loading load is adjusted by adjusting the upper and lower amplitude of the push rod on the free end (left end) of the test sample, that is, by adjusting the upper and lower moving distance of the adjusting nut. Under unlimited conditions, the maximum value of the loading load can be larger, but it must be controlled under certain conditions. It can be adjusted by adjusting the nut and the load control display on the Button linkage control. The maximum value displayed after the button is set is the maximum load value loaded in the test.

[0035] The shape and size of the inner hole at the upper part of the ejector rod inserted into the free end of the specimen can be adjusted according to the shape and size of the test piece, so that the inner hole of the ejector rod matches the test piece.

[0036] During the test, the outer dimensions and surface finish of all specimens (electrode needles) should meet the actual use conditions and be basically the same.

[0037] The specimen materials targeted for testing include but are not limited to pure platinum, and may also include other metal or alloy materials such as precious metals like palladium, silver, and gold, or materials with a layer of precious metals such as iridium, ruthenium, and platinum plated on the surface of other metals, or other metal, alloy materials, and even metal matrix composites, inorganic non-metallic materials, etc.

[0038] During the test, the specimen support plate can move left and right and can be fixed once the position is determined, for adjusting to test pieces of different lengths.

[0039] During the test, in addition to using the Figure 2 screw positioning and fixing in Figure 3 for fixing the specimen in the specimen fixing system, the method in Figure 3 can also be used, that is, after one end of the test piece is inserted into the perforated part of the fixed end, the joint part is pressed and fixed. Of course, other methods can also be used, but the premise is that the strength of the test piece cannot be sacrificed.

[0040] The test device is also applicable to the service life evaluation of specimens fixed at one end and subjected to fluid impact at other parts in other environments of non-converter valve systems. This fluid is not limited to liquid media such as water, solutions, and various liquid oils and fats, but also includes gas media such as air and nitrogen. Solid media are not applicable. The only adjustments required are the dimensions of the specimens, the load magnitude / movement distance, frequency, and the corresponding parts of the ejector rod device and specimen fixing system that match the test piece in different environments. As long as the adjusted test system matches the test piece, it can be used.

[0041] Example 1

[0042] Example 1 uses an unused imported Pt electrode needle for voltage equalizing electrodes of the same batch that did not break during environmental use. Its diameter is 2 mm and the extended length is 35 mm. A small plane is processed at one end of the pure Pt wire and inserted into the fixed end, and it is positioned and fixed with a positioning screw. By adjusting the vertical movement distance of the adjusting nut and setting the load control display instrument, the maximum load displayed on the load control display instrument is set to 1.5 Kg (about 15 N), and the loading frequency is set to 20 Hz. Other positioning and preparation work are carried out according to the requirements described above. Start the power supply to make the loading system move up and down reciprocally until the specimen breaks. The value displayed on the loading times display instrument at the time of fracture is the life of the specimen tested in the experiment, and this value is called the target evaluation life. Conduct the same test on domestic pure Pt wire with the same outer dimensions, surface finish, etc., and the loading times at the time of fracture can also be measured. The obtained life is called the specimen evaluation life. When the specimen evaluation life is higher than the target evaluation life, the performance is better than that of the imported product and fully meets the design requirements. When the specimen evaluation life is lower than the target evaluation life, the performance is lower than that of the imported product.

[0043] Example 2

[0044] Example 2 uses an unused imported Pt electrode needle for voltage equalizing electrodes of the same batch that did not break during environmental use. Its diameter is 2 mm and the extended length is 46 mm. One end is inserted into the jack of the fixed end and firmly connected to the specimen clamping fixed end by pressing. By adjusting the vertical movement distance of the adjusting nut and setting the load control display instrument, the maximum load displayed on the load control display instrument is set to 2 Kg (about 20 N), and the loading frequency is adjusted to 15 Hz. Other positioning and preparation work are carried out according to the requirements described above. Start the power supply to make the loading system move up and down reciprocally until the specimen breaks. The value displayed on the loading times display instrument at the time of fracture is the target evaluation life. Conduct the same test on domestic pure Pt wire with the same outer dimensions, surface finish, etc., and the loading times at the time of fracture can also be measured to obtain the specimen evaluation life. When the specimen evaluation life is higher than the target evaluation life, the performance is better than that of the imported product and fully meets the design requirements. When the specimen evaluation life is lower than the target evaluation life, the performance is lower than that of the imported product.

[0045] Example 3

[0046] In this Example 3, a Pt electrode needle for voltage equalizing electrodes of the same batch of imported unused ones that did not break during environmental use is adopted. Its diameter is 2 mm and the extended length is 80 mm. A small flat surface is machined at one end and inserted into the fixed end, and positioned and fixed with a positioning screw. By adjusting the vertical movement distance of the adjusting nut and setting the load control display instrument, the maximum load displayed on the load control display instrument is 3 Kg (about 30 N), and the loading frequency is adjusted to 10 Hz. Other positioning and preparation work are carried out according to the requirements described above. Start the power supply to make the loading system move up and down reciprocally until the specimen breaks. The value displayed on the loading times display instrument at the time of fracture is the target evaluation life. Conduct the same test under the same conditions with domestic pure Pt wire materials with the same external dimensions, surface finish, etc. Similarly, the loading times at the time of its fracture can be measured to obtain the specimen evaluation life. When the specimen evaluation life is higher than the target evaluation life, the performance is better than that of the imported product and fully meets the design requirements. When the specimen evaluation life is lower than the target evaluation life, the performance is lower than that of the imported product.

[0047] Example 4

[0048] In this Example 4, two unused Pt electrode needles corresponding to batches of voltage equalizing electrodes that have been used in substations are adopted. Its diameter is 2 mm and the extended length is 46 mm. One end is inserted into the jack of the fixed end and firmly connected to the specimen clamping fixed end by pressing. By adjusting the vertical movement distance of the adjusting nut and setting the load control display instrument, the maximum load displayed on the load control display instrument is 2 Kg (about 20 N), and the loading frequency is set to 10 Hz. Other positioning and preparation work are carried out according to the requirements described above. Start the power supply to make the loading system move up and down reciprocally until the specimen breaks. The value displayed on the loading times display instrument at the time of fracture is the specimen evaluation life. Compare the evaluation lives of the two specimens. When the evaluation life of one specimen is higher than that of the other specimen, the performance is relatively better, and vice versa.

[0049] Example 5

[0050] In this Example 5, a stainless steel wire with a diameter of 2 mm and an extended length of 35 mm is adopted, and its surface is plated with a 25-μm Pt layer. One end is inserted into the jack of the fixed end and firmly connected to the specimen clamping fixed end by pressing. By adjusting the vertical movement distance of the adjusting nut and setting the load control display instrument, the maximum load displayed on the load control display instrument is 2 Kg (about 20 N), and the loading frequency is set to 15 Hz. Other positioning and preparation work are carried out according to the requirements described above. Start the power supply to make the loading system move up and down reciprocally until the specimen breaks. The value displayed on the loading times display instrument at the time of fracture is the evaluation life of the specimen tested in the experiment.

[0051] Example 6

[0052] In this Example 6, a hollow titanium alloy tube with an outer diameter of 3 mm, an inner diameter of 1 mm, an overhanging length of 46 mm, and an outer layer plated with 30 μm of iridium is used. A small flat surface is machined at one end and inserted into the fixed end, and positioned and fixed with a positioning screw. By adjusting the vertical movement distance of the adjusting nut and setting the load control display instrument, the maximum load displayed on the load control display instrument is set to 2 Kg (about 20 N), and the loading frequency is set to 20 Hz. Other positioning and preparation work are carried out according to the requirements described above. The power supply is started to make the loading system move up and down reciprocally until the specimen breaks. The value displayed on the loading times display instrument at the time of fracture is the evaluated life of the specimen tested in the experiment.

[0053] Example 7

[0054] In this Example 7, a high-temperature alloy flat bar with an overhanging length of 80 mm and a cross-section of 3 mm * 5 mm is used. One end is inserted into the jack of the fixed end and firmly connected to the specimen clamping fixed end by pressing. The jack parts of the fixed end and the upper part of the ejector rod are machined into rectangular jacks suitable for the flat bar used in the test. By adjusting the vertical movement distance of the adjusting nut and setting the load control display instrument, the maximum load displayed on the load control display instrument is set to 3 Kg (about 30 N), and the loading frequency is set to 20 Hz. Other positioning and preparation work are carried out according to the requirements described above. The power supply is started to make the loading system move up and down reciprocally until the specimen breaks. The value displayed on the loading times display instrument at the time of fracture is the evaluated life of the specimen tested in the experiment.

[0055] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A device for quickly evaluating the service life of electrode needles used in voltage-equalizing electrodes, characterized in that: The invention comprises a sample fixing system, a power system, a loading system, a sensor system and a control module. The loading system comprises a limit sleeve and a push rod which is arranged in the limit sleeve and can move in the limit sleeve. The limit sleeve is provided with a limit hole. Two ends of the sample are respectively arranged on the sample fixing system and in the limit hole. The power system is used to drive the push rod to move in the limit sleeve and load the sample. The sensor system provides real-time feedback on the direction and size of the pressurized load on the sample during the movement of the push rod, and can be linked with the control module for control through the maximum load and its set change.

2. The device for quickly evaluating the service life of electrode needles used in voltage-equalizing electrodes according to claim 1, characterized in that: The power system includes a variable frequency speed regulating motor, an eccentric wheel arranged at the output end of the variable frequency speed regulating motor, and an adjustable connecting rod matched with the eccentric wheel. The adjustable connecting rod is connected to the push rod, and the adjustable connecting rod drives the push rod to reciprocate up and down.

3. The device for quickly evaluating the service life of electrode needles used in voltage-equalizing electrodes according to claim 2, characterized in that: The loading system also includes an adjusting nut, which is used to adjust the distance of the top rod's up and down reciprocating movement.

4. The device for quickly evaluating the service life of electrode needles used in voltage-equalizing electrodes according to claim 2, characterized in that: The sensor system includes a sensor arranged at the end of the push rod, a signal transmission line and built-in control software, and the signal transmission line is respectively connected to the control module and the built-in control software system interface.

5. The device for quickly evaluating the service life of electrode needles used in voltage-equalizing electrodes according to claim 4, characterized in that: The control module includes a control and display panel, a loading control display, a loading times display, a frequency display, a frequency adjustment knob, a power off button, a power on button and a power cord; the loading control instrument can be used to realize the increase and decrease setting adjustment of the maximum load, and can display the loading mode and size of the load during operation in real time, and is linked with the sensor and the power off button and the power on button for control; the loading times display is used to display the loading times in the test phase, and one up and down reciprocating cycle is recorded as a number, and so on, the maximum display number can reach 99999999; the frequency display is used to display the loading frequency of the variable frequency speed regulation motor during the test; the frequency adjustment knob can adjust the frequency, thereby adjusting the speed of the variable frequency speed regulation motor.

6. The device for quickly evaluating the service life of electrode needles used in voltage-equalizing electrodes according to claim 1, characterized in that: The sample fixing system comprises a sample supporting rod with a through hole on the upper part, a sample clamping and fixing end arranged in the through hole, and a sample fixing base arranged outside the through hole and connected to the sample clamping and fixing end, and the sample is connected to the sample clamping and fixing end.

7. The device for quickly evaluating the service life of electrode needles used in voltage-equalizing electrodes according to claim 1, characterized in that: The sample fixing system comprises a sample supporting rod with a through hole on the upper part and a sample positioning screw inserted into the top of the sample supporting rod and penetrating into the through hole. The sample is arranged in the through hole and is pressed and fixed by the sample positioning screw.

8. The device for quickly evaluating the service life of electrode needles used in voltage-equalizing electrodes according to claim 7, characterized in that: The sample supporting rod is retractable and movable.

9. The device for quickly evaluating the service life of electrode needles used in voltage-equalizing electrodes according to claim 1, characterized in that: The sample material is pure Pt, pure Pd or pure Ag, or a metal or alloy with a surface plated with one or more precious metal layers such as Au, Pt, Pd, Ru, etc.

10. A method for quickly evaluating the service life of an electrode needle used in a voltage-equalizing electrode, characterized in that: The device for quickly evaluating the service life of an electrode needle used in a voltage-equalizing electrode according to any one of claims 1 to 9 comprises the following steps: Select the specimen and fix it; According to the actual working environment conditions, corresponding parameters are set, including the effective length of the specimen, the maximum load, the loading frequency, and the reciprocating distance; The samples that meet the requirements are tested according to the conditions set up, and the number of loads they withstand until they break is measured, so as to obtain the service life of the samples used for the voltage equalizing electrode.

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