An electrical hardware corrosion wear fatigue testing machine

Abstract

The present application relates to the field of testing machines, and specifically discloses a corrosion wear fatigue testing machine for electrical fittings, which includes a workbench and an environmental chamber fixedly mounted on the workbench, the upper cover of the environmental chamber being provided with a top cover, the bottom of the environmental chamber being open and connected to a collection tank; an arc-shaped guide rail being fixedly mounted on the workbench outside the environmental chamber, a pendulum being swingably mounted on the workbench in a horizontal plane, one end of the pendulum being slidably mounted in the arc-shaped guide rail, the other end being located in the environmental chamber and being connected to a first fitting to be tested, the first fitting to be tested being hung with a second fitting to be tested, a driving mechanism for driving the pendulum to swing, and a tensioning mechanism for applying a load to the second fitting to be tested being mounted on the workbench; the testing machine also includes a spray mechanism for sandblasting or spraying the fitting to be tested. The present application can simulate the relative sliding wear, stress, and corrosion conditions of fittings in all environments, thereby effectively evaluating the wear and corrosion resistance of connecting fittings under complex service conditions.

Description

Technical Field

[0001] The present application relates to the field of testing machines, and in particular to an electric hardware corrosion and wear fatigue testing machine. Background Art

[0002] Connecting hardware is a key component of overhead transmission lines, used to connect insulators, suspension clamps, tension clamps, and protective hardware to form suspension or tension strings. Connecting hardware is generally made of steel and treated with hot-dip galvanizing for corrosion protection. Because hot-dip galvanizing lacks inherent wear resistance, the combined effects of corrosion and wear in certain areas can rapidly degrade the galvanized coating. This leads to steel-on-steel wear and exposes the components to corrosive environments, quickly leading to hardware failure and fracture.

[0003] At the same time, the connecting hardware is subjected to large tensile stress during operation, which causes the cracks on the surface of the hot-dip galvanized layer to expand rapidly. In an acid rain environment, the expanded cracks make it easier for corrosive media to enter the hot-dip galvanized layer. When the connecting hardware slides relative to each other due to wind load or other factors, micro-wear will occur. The interaction between corrosion and wear will jointly accelerate the failure process of the connecting hardware.

[0004] Based on surveys of hardware in service in typical field environments, the factors most significantly impacting corrosion and wear include the corrosive medium, salt particle deposition rate, sand particle size and shape, and wind speed and angle. Currently, common evaluation methods for connecting hardware lack simulation tests tailored to actual service environments, making it difficult to effectively evaluate the wear and corrosion resistance of connecting hardware under complex service conditions. Summary of the Invention

[0005] In order to effectively evaluate the wear and corrosion resistance of connecting hardware under complex service conditions, the present application provides an electric hardware corrosion and wear fatigue testing machine.

[0006] The present application provides an electric hardware corrosion wear fatigue testing machine that adopts the following technical solutions:

[0007] An electric hardware corrosion wear fatigue testing machine, comprising:

[0008] Workbench;

[0009] An environmental box is fixedly arranged on the workbench, and the upper cover of the environmental box is provided with a top cover;

[0010] An arc-shaped guide rail is fixedly arranged on the workbench and located outside the environmental chamber;

[0011] A swing rod, one end of which is slidably disposed in the arc-shaped guide rail, and the other end of which is located in the environmental chamber and connected to a first hardware to be tested, wherein the first hardware to be tested is hung with a second hardware to be tested; an opening is formed in a side wall of the environmental chamber for the swing rod to pass through;

[0012] a flexible partition, provided on a side wall of the environmental chamber, for shielding the opening;

[0013] A tensioning mechanism, configured to apply a load to the second hardware to be tested, so as to maintain tension between the first hardware to be tested and the second hardware to be tested;

[0014] A driving mechanism, for driving the end of the swing rod to slide back and forth along the arc-shaped guide rail, wherein the swing axis of the swing rod is vertically arranged;

[0015] The spraying mechanism is used for sandblasting or spraying the hardware to be tested.

[0016] During the test, the tensioning mechanism is used to keep the first hardware to be tested and the second hardware to be tested taut, and the driving mechanism is used to drive the end of the rocker arm to slide back and forth along the arc guide rail. When the rocker arm swings, relative sliding and friction occur between the first hardware to be tested and the second hardware to be tested; the spraying mechanism sandblasts or sprays the hardware to be tested, thereby simulating the relative sliding wear, stress and corrosion of the hardware in all environments, and then studying the form, type and cause of corrosion wear; the application of this application is wide, and can effectively evaluate the wear and corrosion resistance of connecting hardware under complex service conditions.

[0017] Compared with the common vertical structure testing machine, the testing machine provided in this application adopts a horizontal structure. During the test, sand, corrosive media and grinding chips will not fall onto the arc guide rail. On the one hand, sand, grinding chips, etc. will not affect the sliding of the rocker arm end on the arc guide rail. On the other hand, the service life of the arc guide rail is extended.

[0018] In addition, the environmental chamber combined with flexible partitions can confine the corrosive environment to the smaller space of the environmental chamber. On the one hand, it is beneficial to maintain the relative stability of the test environment in the environmental chamber. On the other hand, it is beneficial to protect other parts of the testing machine from the influence of the corrosive environment, and also reduce the impact of sand and corrosive media on the surrounding environment.

[0019] Furthermore, the flexible partition member includes a plurality of vertical flexible baffles fixed to the side wall of the environmental chamber, and the plurality of flexible baffles cover the opening.

[0020] Multiple flexible baffles naturally droop under the action of their own gravity, covering the opening without affecting the swing of the pendulum, thereby limiting the corrosion environment within the environmental chamber during the test.

[0021] Furthermore, the tensioning mechanism includes a hydraulic cylinder fixed on the workbench, and the second hardware to be tested is connected to the output end of the hydraulic cylinder.

[0022] The hydraulic cylinder applies a load to the second hardware to be tested, so that the second hardware to be tested is kept in tension with the first hardware to be tested.

[0023] Furthermore, a sliding shaft is fixedly connected to the output end of the hydraulic cylinder, and the sliding shaft passes through the side wall of the environmental box. One end of the sliding shaft located in the environmental box is connected to the second hardware to be tested, and a guide sleeve is fixedly provided on the workbench and is sleeved on the sliding shaft.

[0024] When the piston rod of the hydraulic cylinder is extended and retracted, the sliding shaft slides in the guide sleeve, and the guide sleeve guides the sliding shaft, which helps to improve the stability of the sliding of the sliding shaft; in addition, by adjusting the extended length of the hydraulic cylinder piston rod, the present application is applicable to hardware of different specifications.

[0025] Furthermore, a first slider is fixed to the end of the rocker arm, and the first slider is slidably arranged in the arc guide rail; the driving mechanism includes a crank rotatably arranged on the workbench and a driving member for driving the crank to rotate, and a connecting rod is hinged on the crank, and the end of the connecting rod away from the crank is hinged to the rocker arm.

[0026] The driving member drives the crank to rotate in the horizontal plane, driving the connecting rod to move. The connecting rod pushes the pendulum rod to swing back and forth, causing relative sliding and friction between the first hardware to be tested and the second hardware to be tested. At the same time, the first slider slides back and forth along the arc-shaped guide rail, improving the stability of the pendulum rod's swing. By adjusting the speed of the driving member, the swing frequency of the pendulum rod can be adjusted to study the effect of the swing frequency on hardware wear.

[0027] Furthermore, a second slider is hingedly connected to one end of the connecting rod away from the rocker arm, a sliding groove for the second slider to slide is provided along the length direction of the crank, and a locking piece for locking the second slider is provided on the crank.

[0028] The second slider is slid along the slide groove and then locked to the crank by a locking piece to adjust the position of the second slider on the crank, thereby adjusting the swing amplitude of the pendulum to study the effect of the swing amplitude on the wear of the hardware.

[0029] Furthermore, the spraying mechanism includes a sandblasting head directed toward the hardware to be tested, and the sandblasting head is connected to a sand storage tank.

[0030] The sand in the sand storage tank is sprayed toward the hardware to be tested by the sandblasting head, thus simulating the wind and sand environment when the hardware is in service. By adjusting the composition, particle shape and size of the sand particles, as well as the angle and speed of the sand particles, the influence of different wind and sand environments on the wear of the hardware is studied.

[0031] Furthermore, the spray mechanism also includes a spray head directed toward the hardware to be tested, and the spray head is connected to a mist generating device for generating a cloud of corrosive medium.

[0032] The corrosive medium mist generated by the mist generating device is sprayed from the spray head toward the hardware to be tested, thereby simulating the corrosive environment of the hardware when it is in service. By adjusting the composition, pH, salinity, etc. of the corrosive medium, as well as the speed of the mist spraying, the effects of different corrosive environments on the wear of the hardware can be studied.

[0033] Furthermore, the bottom of the environmental box is open and connected to a collection tank, and the bottom of the collection tank is funnel-shaped and connected to a collection device.

[0034] The sand particles in the environmental chamber fall into the collection tank and are discharged in time, thereby reducing the sand particles from condensing into agglomerates in the humid environment of the environmental chamber, thereby reducing the impact of agglomerated sand particles on the test.

[0035] Furthermore, the top cover is made of transparent material.

[0036] This makes it easier for operators to observe the test progress in the environmental chamber.

[0037] In summary, this application includes at least one of the following beneficial technical effects:

[0038] 1. This application can simulate the relative sliding wear, stress, and corrosion of transmission line hardware in a full range of environments, including wind, sand, and corrosion, and further study the forms, types, and causes of corrosion wear. It has a wide range of applications and can effectively evaluate the wear and corrosion resistance of connection hardware under complex service conditions.

[0039] 2. The use of an environmental chamber with flexible partitions can confine the corrosive environment to a smaller space within the environmental chamber. This helps maintain a relatively stable test environment in the environmental chamber, protects other parts of the test machine from the effects of the corrosive environment, and reduces the impact of sand and corrosive media on the surrounding environment.

[0040] 3. Compared with the common vertical structure testing machine, this application adopts a horizontal structure, and the sand particles sprayed by the spraying mechanism can be discharged in time, thereby reducing the impact of agglomerated sand particles on the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0042] Figure numerals: 1. workbench; 2. curved guide rail; 3. first slider; 4. rocker arm; 5. connecting rod; 6. crank; 7. slide; 8. second slider; 9. opening; 10. flexible baffle; 11. first hardware to be tested; 12. second hardware to be tested; 13. top cover; 14. collecting tank; 15. sandblasting head; 16. spray head; 17. sand storage tank; 18. cloud generating device; 19. guide sleeve; 20. sliding shaft; 21. hydraulic cylinder; 22. environmental chamber. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1 This application is described in further detail.

[0044] The present application discloses an electric hardware corrosion wear fatigue testing machine. Figure 1 The electrical hardware corrosion, wear and fatigue testing machine includes a workbench 1 and an environmental chamber 22 fixedly mounted on the workbench 1. The upper cover of the environmental chamber 22 is provided with an openable top cover 13. The bottom of the environmental chamber 22 is open and connected to a collection tank 14. The bottom of the collection tank 14 is funnel-shaped and connected to a collection device such as a collection box.

[0045] Figure 1 Only half of the top cover 13 is shown. During actual testing, the top cover 13 completely covers the upper portion of the environmental chamber 22, forming a relatively closed space inside the environmental chamber 22. The top cover 13 is made of transparent acrylic material, which facilitates observation of the test progress inside the environmental chamber 22.

[0046] Reference Figure 1 A curved guide rail 2 is fixedly mounted on the workbench 1 and positioned outside the environmental chamber 22. A pendulum 4 is swingably mounted on the workbench 1, with its swing axis vertically positioned. One end of the pendulum 4 slides within the curved guide rail 2, while the other end is positioned within the environmental chamber 22 and connected to a first hardware fixture to be tested 11, which is then attached to a second hardware fixture to be tested 12. A drive mechanism is provided on the workbench 1 for driving the end of the pendulum 4 to slide back and forth along the curved guide rail 2.

[0047] Reference Figure 1 The side wall of the environmental chamber 22 is provided with an opening 9 for the pendulum rod 4 to pass through. A flexible partition member is provided on the side wall of the environmental chamber 22 to shield the opening 9. Specifically, the flexible partition member includes a plurality of vertical flexible baffles 10 fixed to the side wall of the environmental chamber 22. The connection between the flexible baffles 10 and the side wall of the environmental chamber 22 is located above the opening 9. The plurality of flexible baffles 10 are arranged adjacent to each other and shield the opening 9. The flexible baffles 10 can be plastic strips, rubber strips, cloth strips, etc.

[0048] Reference Figure 1A tensioning mechanism is provided on the workbench 1 for applying a load to the second hardware to be tested 12 to maintain tension between the first hardware to be tested 11 and the second hardware to be tested 12.

[0049] Reference Figure 1 The testing machine also includes a spraying mechanism for sandblasting or spraying the hardware to be tested.

[0050] During the test, a tensioning mechanism maintains tension between the first and second hardware fittings to be tested 11, 12, and a driving mechanism drives the end of the rocker arm 4 to slide back and forth along the arc-shaped guide rail 2. When the rocker arm 4 swings, relative sliding and friction occur between the first and second hardware fittings to be tested 11, 12. A spraying mechanism sandblasts or sprays the hardware fittings to be tested, thereby simulating the relative sliding wear, stress, and corrosion conditions of the hardware fittings in a full range of environments, thereby studying the forms, types, and causes of corrosive wear. This application has a wide range of applications and can effectively evaluate the wear and corrosion resistance of connecting hardware under complex service conditions.

[0051] Compared with the common vertical structure testing machine, the testing machine provided in this application adopts a horizontal structure. During the test, sand particles, corrosive media and grinding chips will not fall onto the arc guide rail 2, but will fall into the collection trough 14 and be discharged in time; on the one hand, sand particles, grinding chips, etc. will not affect the sliding of the end of the rocker arm 4 on the arc guide rail 2, and on the other hand, the service life of the arc guide rail 2 is extended.

[0052] Furthermore, the multiple flexible baffles 10 naturally droop under their own weight, shielding the opening 9 without affecting the swing of the rocker 4, thereby confining the corrosive environment to the relatively small space of the environmental chamber 22. This not only helps maintain a relatively stable test environment in the environmental chamber 22, but also helps protect other parts of the test machine from the corrosive environment. It also reduces the impact of sand and corrosive media on the surrounding environment, especially preventing sand and corrosive media from leaking from the environmental chamber 22 onto the curved guide rail 2, which would accelerate the scrapping of the curved guide rail 2. To improve the shielding effect, the flexible baffles 10 can be stacked in multiple layers.

[0053] Reference Figure 1 The tensioning mechanism includes a hydraulic cylinder 21 fixed to the workbench 1, and the second hardware to be tested 12 is connected to the output end of the hydraulic cylinder 21. Furthermore, a sliding shaft 20 is fixedly connected to the output end of the hydraulic cylinder 21. The sliding shaft 20 passes through the side wall of the environmental chamber 22. The end of the sliding shaft 20 located inside the environmental chamber 22 is connected to the second hardware to be tested 12. A guide sleeve 19 is fixedly provided on the workbench 1 and is sleeved on the sliding shaft 20.

[0054] The hydraulic cylinder 21 applies a load to the second hardware fitting 12, maintaining tension between the second hardware fitting 12 and the first hardware fitting 11. As the piston rod of the hydraulic cylinder 21 extends and retracts, the sliding shaft 20 slides within the guide sleeve 19. The guide sleeve 19 guides the sliding shaft 20, helping to improve the sliding stability of the sliding shaft 20. Furthermore, by adjusting the extended length of the piston rod of the hydraulic cylinder 21, the present invention is applicable to hardware fittings of different specifications.

[0055] The hydraulic cylinder 21 provides stepless loading, providing the fixture with the required constant test load, meeting diverse testing requirements. A spoke-type force sensor can be installed between the sliding shaft 20 and the output end of the hydraulic cylinder 21 to measure the test force applied by the hydraulic cylinder 21. The guide sleeve 19 ensures that the force sensor is only subject to axial tension, while the guide sleeve 19 bears the lateral force component generated by the swinging motion. This improves the force sensor's measurement accuracy and extends its service life.

[0056] Reference Figure 1 The end of the rocker arm 4 is fixedly connected to a first slider 3, and the first slider 3 is slidably set in the arc guide rail 2; the driving mechanism includes a crank 6 rotatably set on the workbench 1 and a driving member for driving the crank 6 to rotate, and the driving member can be a servo motor; a connecting rod 5 is hinged on the crank 6, and the end of the connecting rod 5 away from the crank 6 is hinged to the rocker arm 4.

[0057] The driving member drives the crank 6 to rotate in the horizontal plane, driving the connecting rod 5 to move. The connecting rod 5 pushes the pendulum rod 4 to swing back and forth, causing relative sliding and friction between the first hardware to be tested 11 and the second hardware to be tested 12. At the same time, the first slider 3 slides back and forth along the arc-shaped guide rail 2, improving the stability of the swing of the pendulum rod 4. By adjusting the speed of the driving member, the swing frequency of the pendulum rod 4 can be adjusted to study the effect of the swing frequency on the wear of the hardware.

[0058] Further, refer to Figure 1 The end of the connecting rod 5 away from the rocker arm 4 is hingedly connected to a second slider 8. The crank 6 has a sliding groove 7 along its length for the second slider 8 to slide. The crank 6 is provided with a locking member for locking the second slider 8. The locking member can be a bolt passing through the second slider 8. The crank 6 has a plurality of positioning holes for the bolts to pass through at intervals.

[0059] The second slider 8 is slid along the guide groove 7 and then locked to the crank 6 using a locking member. This allows the second slider 8 to be adjusted on the crank 6, thereby adjusting the swing amplitude of the pendulum 4 to study the effect of swing amplitude on hardware wear. In this embodiment, the radius of the curved guide rail 2 is R = 960 mm, the maximum swing amplitude of the pendulum 4 is ±30°, and the swing frequency is between 0.5 Hz and 2 Hz.

[0060] The U-shaped hanging ring of model U-10 was tested using the testing machine provided by this application. Some of the experimental results are shown in Table 1:

[0061] Table 1 Results of corrosion wear fatigue test on U-shaped hanging ring

[0062]

[0063] In order to simulate the composite service conditions of hardware, refer to Figure 1 The spraying mechanism includes a sandblasting head 15 facing the hardware to be tested, and the sandblasting head 15 is connected to a sand storage tank 17.

[0064] The sand in the sand storage tank 17 is sprayed toward the hardware to be tested by the sandblasting head 15, thereby simulating the wind and sand environment when the hardware is in service. By adjusting the composition, particle shape and size of the sand particles, as well as the angle and speed of the sand particles, the effects of different wind and sand environments on the wear of the hardware can be studied.

[0065] Further, refer to Figure 1 The spray mechanism also includes a spray head 16 directed toward the hardware to be tested, and the spray head 16 is connected to a mist generating device 18 for generating a cloud of corrosive medium.

[0066] The corrosive medium mist generated by the mist generating device 18 is sprayed toward the hardware to be tested by the spray head 16, thereby simulating the corrosive environment of the hardware when it is in service. By adjusting the composition, pH, salinity, etc. of the corrosive medium, as well as adjusting the speed of the mist spraying, the influence of different corrosive environments on the wear of the hardware can be studied.

[0067] The implementation principle of the electric hardware corrosion and wear fatigue testing machine of the embodiment of the present application is as follows: during the test, the hydraulic cylinder 21 is used to maintain tension between the first hardware to be tested 11 and the second hardware to be tested 12, the crank 6 rotates and drives the end of the rocker arm 4 to slide back and forth along the arc guide rail 2, thereby causing relative sliding and friction between the first hardware to be tested 11 and the second hardware to be tested 12; the spray mechanism sandblasts or sprays the hardware to be tested, thereby simulating the relative sliding wear, stress and corrosion conditions of the hardware in all environments, and then studying the form, type and cause of corrosion wear; the application of the present application is wide, and can effectively evaluate the wear and corrosion resistance of connecting hardware under complex service conditions.

[0068] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An electric hardware corrosion wear fatigue testing machine, characterized by: include: Workbench; An environmental box is fixedly arranged on the workbench, and the upper cover of the environmental box is provided with a top cover; An arc-shaped guide rail is fixedly arranged on the workbench and located outside the environmental chamber; A swing rod, one end of which is slidably disposed in the arc-shaped guide rail, and the other end of which is located in the environmental chamber and connected to a first hardware to be tested, wherein the first hardware to be tested is hung with a second hardware to be tested; an opening is formed in a side wall of the environmental chamber for the swing rod to pass through; a flexible partition, provided on a side wall of the environmental chamber, for shielding the opening; A tensioning mechanism, configured to apply a load to the second hardware to be tested, so as to maintain tension between the first hardware to be tested and the second hardware to be tested; A driving mechanism, for driving the end of the swing rod to slide back and forth along the arc-shaped guide rail, wherein the swing axis of the swing rod is vertically arranged; The spraying mechanism is used for sandblasting or spraying the hardware to be tested.

2. The electrical hardware corrosion wear fatigue testing machine according to claim 1, characterized in that: The flexible partition member includes a plurality of vertical flexible blocking strips fixed to the side wall of the environmental box, and the plurality of flexible blocking strips cover the opening.

3. The electrical hardware corrosion wear fatigue testing machine according to claim 1, characterized in that: The tensioning mechanism includes a hydraulic cylinder fixed on the workbench, and the second hardware to be tested is connected to the output end of the hydraulic cylinder.

4. The electrical hardware corrosion wear fatigue testing machine according to claim 3, characterized in that: The output end of the hydraulic cylinder is fixedly connected to a sliding shaft, which passes through the side wall of the environmental box. One end of the sliding shaft located in the environmental box is connected to the second hardware to be tested, and a guide sleeve is fixedly provided on the workbench and is sleeved on the sliding shaft.

5. The electrical hardware corrosion wear fatigue testing machine according to claim 1, characterized in that: A first slider is fixedly connected to the end of the rocker arm, and the first slider is slidably arranged in the arc guide rail; the driving mechanism includes a crank rotatably arranged on the workbench and a driving member for driving the crank to rotate, and a connecting rod is hinged on the crank, and the end of the connecting rod away from the crank is hinged to the rocker arm.

6. The electrical hardware corrosion wear fatigue testing machine according to claim 5, characterized in that: A second slider is hinged on one end of the connecting rod away from the rocker arm. A sliding groove for the second slider to slide is provided along the length direction of the crank. A locking piece for locking the second slider is provided on the crank.

7. The electrical hardware corrosion wear fatigue testing machine according to claim 1, characterized in that: The spray mechanism includes a sandblasting head facing the hardware to be tested, and the sandblasting head is connected to a sand storage tank.

8. The electrical hardware corrosion wear fatigue testing machine according to claim 7, characterized in that: The spray mechanism further comprises a spray head directed toward the hardware to be tested, and the spray head is connected to a mist generating device for generating a cloud of corrosive medium.

9. The electrical hardware corrosion wear fatigue testing machine according to claim 1, characterized in that: The bottom of the environmental box is open and connected to a collecting tank. The bottom of the collecting tank is funnel-shaped and connected to a collecting device.

10. The electrical hardware corrosion wear fatigue testing machine according to claim 1, characterized in that: The top cover is made of transparent material.

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