Shaft connecting piece swing working condition wear and corrosion test device and method thereof

Abstract

The application discloses a kind of wear and corrosion test device and method of shaft connecting piece swing operating condition.Under test device includes fatigue testing machine, sample loading rack, corrosion liquid drop adding-collection system, sample fixing system, sample clamp and shaft sample.Sample clamp vice includes lug, fork lug and limit sheet, one end of lug is installed in fork lug by shaft sample clamping positioning;Sample fixing system includes tension sensor, first screw, second screw;Therefore, the application takes cylindrical shaft as sample, circular arc surface as counter abrasive surface, can load swing amplitude by displacement control of fatigue testing machine, horizontal plane is constrained to apply bending stress, to generate friction in swing state.Therefore, the application can simulate the corrosion and wear process of shaft connecting piece in swing state, can provide test means for similar working condition parts, and operability is strong;Bending stress, friction, swing amplitude and corrosion rate that shaft sample suffers can be adjusted and controlled, can satisfy different test condition needs.

Description

Technical Field

[0001] This invention relates to a corrosion and wear testing device and method under oscillating conditions, specifically a corrosion and wear coupled damage testing device and method for shaft-type connectors under oscillating conditions. Background Technology

[0002] Shaft connectors are commonly used connecting components in engineering, widely applied in mechanical, civil, and automotive engineering fields. Their primary function is to support rotating transmission components and transmit force and motion. Therefore, they not only bear loads such as torque and bending moment but also experience rotational friction at their mating surfaces. Furthermore, many shaft connectors operate in environments rich in corrosive factors, such as water vapor, industrial acid / alkali liquids, rainwater, salt water, and organic solvents, which can cause coupled corrosion and wear damage, accelerating the damage rate and leading to premature failure. Accurately predicting the damage rate, reliability, and lifespan of shaft connectors under different corrosive and wear environments is crucial for the safety and service life of various mechanical and engineering structures. However, the damage mechanism under coupled factors is complex and not linearly related to the effect of a single factor, requiring a series of time-series tests to understand its mechanism. Therefore, experimental devices for testing the coupled corrosion and wear damage of shaft connectors are of great practical significance.

[0003] Therefore, a corrosion and wear testing device for shaft connectors under oscillating conditions is proposed to simulate the corrosion and wear problems of shaft connectors such as suspension bridge cable connecting pins, swing shafts of port cranes, and vibration shafts of large vehicle vibration suspension devices during oscillation. This testing device allows for adjustment of the bending stress, oscillation amplitude, and corrosion rate of the specimen, enabling simulation of various corrosion environments and simultaneous implementation of wear and corrosion conditions. By analyzing the damage amount and characteristics of the specimens at different times, and using pre-set stress and corrosion parameters, the temporal corrosion and wear mechanism of the shaft specimens can be revealed. The influence of factors such as stress, friction, oscillation amplitude, and corrosive media on the failure of the shaft specimens can be deduced, thereby establishing a reliability assessment model for the component and predicting the performance and lifespan of shaft connectors under oscillation and corrosion conditions.

[0004] Currently, testing devices for corrosion and wear include: Patent ZL200910059910.6 discloses a constant-temperature torsional corrosion and wear testing device, where the test sample is a spherical specimen. During the test, the spherical sample is immersed in a constant-temperature water bath system. The testing system is equipped with electrochemical testing equipment that can record the corrosion behavior of the sample in real time. However, the test sample is spherical, and the friction is generated by torsion, which is inconsistent with the force and friction conditions of shaft connectors; Patent ZL201010526678.5 discloses a weight-loaded ring-block corrosion and wear testing machine, which can test the corrosion and wear behavior of ring block samples in metal corrosive media. The field involved is a high-temperature metal corrosion environment, not the corrosion environment of ordinary shaft connectors, and the wear sample is ring-shaped, which is different from the shape characteristics of shaft connectors; Patent ZL200910059910.6 discloses a constant-temperature torsional corrosion and wear testing device. Patent ZL201220680116.0 discloses a tangential and radial composite fretting corrosion and wear testing device, which can simulate the composite fretting corrosion and wear process of materials in a corrosive environment. However, the tested samples are rubbed between planes, and the friction is translational, which cannot test the corrosion and wear performance of shaft samples under oscillating conditions. Patent ZL201520205739.6 discloses a corrosion and wear testing device that uses a friction form of rubbing between the sample and a turntable. The sample is immersed in a corrosive liquid and connected to electrochemical operation, which can measure the real-time corrosion performance of the sample. In addition, the device is equipped with a sample weight loss chuck, which can measure the weight change data of the sample during corrosion. However, the test method is planar grinding, which does not reflect the service conditions of shaft-type connectors, and the friction contact form and oscillating motion characteristics cannot be represented. Patent ZL201910383619.8 discloses a pin-disc type corrosion wear device, characterized by a corrosion tank with a heating element to adjust the working environment, but the friction method is planar grinding, which does not match the force and friction conditions of shaft-type connectors. Patent ZL201821983607.6 discloses an oscillating wear test bench corrosion wear solution tank, with the test object being a pin-type sample, which generates friction under oscillation. However, this device is used to store corrosion solution and does not involve the force application facilities and test methods for oscillation motion, and is not a complete test device for corrosion fatigue of shaft-type connectors under oscillation. Summary of the Invention

[0005] This invention addresses the corrosion and wear problem faced by shaft connectors under oscillating conditions, providing a corrosion fatigue testing device that uses a cylindrical shaft as the specimen, an arc surface as the grinding surface, and a corrosive liquid that can be controllably dripped into the mating gap. The device controls the oscillation amplitude through fatigue testing machine displacement and applies bending stress through horizontal constraints, thereby generating frictional force during oscillation. The pendulum pair, oscillation frequency, bending stress, frictional force, and corrosion rate are all adjustable in the test conditions. This testing device consists of a simple fatigue testing machine, a specimen loading platform, and a corrosive liquid dripping and collection system, featuring easy assembly, disassembly, and secondary development capabilities. The specimen loading platform can be customized to different sizes according to different test stresses, and its simple construction and readily available raw materials make it highly feasible. The corrosive liquid dripping and collection system has a simple principle, is suitable for various corrosive liquids, and can be disassembled into a single-shaft specimen oscillation wear testing device, achieving multi-purpose functionality.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A corrosion and wear testing device for shaft connectors under oscillating conditions includes a fatigue testing machine, a sample loading platform, a corrosion droplet application and collection system, a sample fixing system, a sample clamp pair, and a shaft sample. The sample fixing system is supported by the sample loading platform. The sample clamp pair is mounted on the sample fixing system and located below the loading head of the fatigue testing machine. The corrosion droplet application and collection system is installed on the fatigue testing machine, and the needle of the corrosion droplet application and collection system can apply corrosion droplets onto the shaft sample. The shaft sample is clamped and installed by the sample clamp pair, and one end of the shaft sample is provided with a semi-circular groove. The sample clamp pair includes an ear plate, a fork, and a limiting piece. The sample fixing system includes a tension sensor, a first screw, and a second screw.

[0008] One end of the ear plate is clamped and positioned in the fork lug by a shaft sample, and the shaft sample is axially and rotationally limited by a limiting piece installed on the outside of the fork lug;

[0009] The fork lug is installed to the sample loading platform via the first screw and locked to the sample loading platform with the first high-strength nut; the other end of the lug is installed to the sample loading platform via a tension sensor and the second screw in sequence, and locked to the sample loading platform with the second high-strength nut; the first screw and the second screw are arranged collinearly;

[0010] The upper end of the ear plate has a semi-circular groove; the loading head of the fatigue testing machine has a profile that matches the groove;

[0011] The loading head of the fatigue testing machine can move up and down; when the loading head of the fatigue testing machine is pressed down, it can fit tightly with the groove; when the loading head of the fatigue testing machine continues to press down, it can drive the ear plate and fork to rotate relative to each other; when the loading head of the fatigue testing machine moves up, it gradually separates from the groove until the ear plate and fork return to their original positions.

[0012] During the up-and-down movement of the loading head of the fatigue testing machine, rotational friction is generated between the ear plate and the surface of the shaft specimen.

[0013] Preferably, the fatigue testing machine includes a crossbeam, a base, a column, and a loading head, wherein the loading head includes a clamp and a pressure bar; wherein:

[0014] The upright is fixed to the base; the crossbeam is supported above the base by the upright and can move up and down along the upright; the pressure bar is suspended below the crossbeam by a clamp, and the lower end of the pressure bar has a profile that matches the groove;

[0015] The fork lug is fastened to the eye nut on the inner end of the first screw via a second shackle, while the outer end of the first screw is installed on the sample loading platform; the other end of the lug is fastened to the first eye screw on one end of the tension sensor via a first shackle, and the second eye screw on the other end of the tension sensor is fastened to the Y-shaped fork on the inner end of the second screw, while the outer end of the second screw is installed on the sample loading platform; the first screw and the second screw are collinear.

[0016] Preferably, the corrosive liquid dripping-collection system includes a storage tank, a liquid guiding hose, a flow rate window, a drip rate regulating valve, and a needle. The storage tank contains corrosive liquid, and the outlet of the storage tank is connected to the needle through the liquid guiding hose. A flow rate window and a flow rate regulating valve are sequentially installed on the liquid guiding hose between the outlet of the storage tank and the needle.

[0017] Preferably, the sample loading platform is placed longitudinally below the chuck, spanning the base. Two steel plates containing circular through holes are welded symmetrically between the front and rear double-layer crossbeams of the sample loading platform. The first screw and the second screw are respectively connected through the aforementioned two circular through holes. The corrosion droplet addition-collection system also includes a liquid collector, which is located below the sample loading platform and is directly opposite the location of the shaft sample.

[0018] Preferably, the magnitude of the bending stress on the shaft specimen satisfies:

[0019] ;

[0020] Where: T is the reading of the tension sensor, b is the width of the lug, a is the width of a single fork lug, and d is the diameter of the shaft sample.

[0021] Preferably, the bottom end of the pressure rod is hemispherical, and the diameter of the hemisphere is consistent with the groove at the top of the ear plate.

[0022] Preferably, the reservoir and the delivery hose are both made of polyethylene, the flow rate window and the accumulator are made of borosilicate glass, and the needle is made of polypropylene tubing and is connected to the end of the delivery hose.

[0023] Preferably, the corrosive liquid contained in the storage tank is an aqueous solution of an acidic, alkaline, or neutral solution or an organic solution.

[0024] Preferably, the fork lug is provided with a set of through fork lug holes, corresponding to the first fork lug hole and the second fork lug hole; the lug plate is provided with lug plate holes; the lug plate holes of the lug plate are respectively through the first fork lug hole and the second fork lug hole on both sides thereon;

[0025] The shaft sample with a semi-circular groove passes through the second fork lug hole, the lug plate hole and the first fork lug hole in sequence, and is fixed by a limiting piece with two screws. The two screws are tightened and fixed through the through hole on the limiting piece and the threaded hole on the fork lug.

[0026] Another technical objective of this invention is to provide a method for testing the corrosion and wear of shaft connectors under oscillating conditions, based on the aforementioned testing device for corrosion and wear of shaft connectors under oscillating conditions, comprising the following steps:

[0027] Step 1: Loading the shaft sample

[0028] Load the shaft specimen into the specimen fixing system;

[0029] Step 2: Install the sample fixing system

[0030] Install the sample fixing system onto the sample loading platform and adjust the tightness of the first and second high-strength nuts to control the required tensile force;

[0031] Step 3: Loading the fatigue testing machine

[0032] Step 3.1: Control the crossbeam to move downwards so that the pressure rod approaches the groove;

[0033] Step 3.2: When the distance between the bottom end of the pressure bar and the groove is less than or equal to the preset value D, stop the crossbeam from moving downward and instead control the clamp to move downward until the bottom end of the pressure bar is in close contact with the groove, and record the pressure value F1 applied by the fatigue testing machine.

[0034] Step 3.3: Control the chuck to move up and down reciprocally to drive the pressure rod to move up and down reciprocally. The displacement amplitude of the pressure rod's up and down reciprocating motion is controlled to be S. At the same time, the etchant drips evenly and stably from the needle into the shaft sample.

[0035] During the downward pressing of the pressure bar, pressure is applied to the ear plate, forcing the ear plate and the fork to rotate downward relative to each other; during the upward moving of the pressure bar, the pressure is gradually released, the ear plate and the fork swing upward, and the sample fixing system returns to a horizontal tensioned state;

[0036] During loading, the magnitude of the bending stress on the shaft specimen satisfies:

[0037]

[0038] Where: T is the reading of the tension sensor, b is the width of the lug, a is the width of a single fork lug, and d is the diameter of the shaft sample.

[0039] Based on the above technical solution, compared with the prior art, the present invention has the following technical effects:

[0040] 1. This invention uses a displacement-controlled loading method to make the clamp move vertically slightly. The pressure bar held by the clamp causes the test fixture and shaft sample to swing slightly. The swing amplitude is controlled by the displacement magnitude.

[0041] 2. In this invention, the shaft sample is horizontally placed in the loading platform by a fixing system using nuts. The magnitude of the bending stress it experiences is controlled by adjusting the tightness of the nuts, and the bending stress is calculated from the readings of the tension sensor.

[0042] 3. In this invention, the corrosive liquid drop-collection system provides corrosion conditions with a controllable corrosion rate for the sample. The flow rate of the corrosive liquid is controlled by the drop rate regulating valve, and it is dripped from the top of the sample and dripped into the collection container from the bottom.

[0043] The test device of this invention can simulate the corrosion and wear process of shaft connectors under oscillation, and can provide test methods for parts under similar working conditions. It is highly operable. The bending stress, friction force, oscillation amplitude and corrosion rate of the shaft sample can be adjusted and controlled to meet the requirements of different test conditions. Attached Figure Description

[0044] The invention will now be further described with reference to the accompanying drawings.

[0045] Figure 1 This is a schematic diagram of the overall structure of the experimental device of the present invention;

[0046] Figure 2 This is a schematic diagram of the sample installation of the present invention;

[0047] Figure 3 This is a schematic diagram of the corrosive liquid dripping device of the present invention;

[0048] Figure 4 This is a schematic diagram of the sample support and fixing frame of the present invention;

[0049] Figure 5 This is a schematic diagram of the sample fixture assembly of the present invention;

[0050] Figure 6 This is a schematic diagram of the sample clamp-fork lug of the present invention;

[0051] Figure 7 This is a schematic diagram of the sample clamp-ear plate of the present invention;

[0052] Figure 8 This is a schematic diagram of the sample clamp-limiter of the present invention;

[0053] Figure 9 This is a schematic diagram of the shaft sample of the present invention;

[0054] Figure 10 The diagram shows the experimental results of the shaft connection. Detailed Implementation

[0055] The specific implementation method of the present invention will be further described in detail below with reference to the accompanying drawings, but the specific implementation method of the invention is not limited thereto.

[0056] like Figures 1-3 As shown, a corrosion fatigue testing machine for shaft connectors under oscillating conditions includes a fatigue testing machine, a sample loading platform, a corrosion droplet feeding and collection system, a sample clamp pair, a sample fixing system, and a shaft sample. The fatigue machine is fixed to the ground by a base 3. The movable crossbeam 2 is supported by a right column 4-a and a left column 4-b, and a clamp 1 is provided at its lower end to clamp the pressure rod 16.

[0057] The shaft sample 15 is inserted through the hole 14-2a of the fork lug 14, then through the hole 13-2 of the lug 13, and finally out through the hole 14-2b of the fork lug 14. The shaft sample 15 contains a limiting groove 15-1, and the limiting piece 26 is inserted into the bottom of the limiting groove 15-1. Two screws are passed through the through holes 26-a and 26-b respectively, and screwed all the way into the threaded holes 14-3a and 14-3b to fix the limiting piece 26. The assembled sample is as follows. Figure 3 As shown. Then the assembled sample is as follows. Figure 2 The method shown connects and fixes the sample loading platform 27.

[0058] The sample fixing system is connected as follows: Two D-type shackles correspond to the first D-type shackle 8-a and the second D-type shackle 8-b. First, pass the U-shaped portion of the first D-type shackle 8-a through the eye nut 7, and the U-shaped portion of the second D-type shackle 8-b through the first eye screw 9-a. Then, pass the threaded cylindrical pin of the first D-type shackle 8-a through the first shackle mounting hole 13-2 on the ear plate 13 and tighten it. Next, pass the threaded cylindrical pin of the second D-type shackle 8-b through the second shackle mounting hole 14-1 on the fork ear 14 and tighten it. Then, screw the first screw 6 into the eye nut 7. Screw the corresponding portions of the first eye screw 9-a and the second eye screw 9-b into the threaded holes at both ends of the tension sensor 10. Then, pass the threaded cylindrical pin of the Y-type fork 11 through the second eye screw 9-b and tighten it. Finally, screw the second screw 12 into the threaded hole at the tail of the Y-type fork, completing the assembly of the sample fixing system. The assembled system is as follows: Figure 2 As shown.

[0059] Insert the screws 6 and 12 at both ends of the assembled sample fixing system into the first fixing hole 27-a and the second fixing hole 27-b of the sample support frame 27, respectively. Then, screw the first high-strength nut 5-a and the second high-strength nut 5-b into the tails of the first screw 6 and the second screw 12, respectively. Adjust the positions of the first and second screws back and forth. When the hemispherical groove 13-3 is directly below the pressure rod 16, tighten the first high-strength nut 5-a and the second high-strength nut 5-b, and adjust the tightness of the first and second high-strength nuts according to the required tensile force. The signal from the tensile sensor is transmitted to the external display via the data line 17. The axial tensile force on the entire system can be directly read from the external display. In the test, the tensile force was set to 700kN±20kN.

[0060] After the sample is fixed horizontally, the movable crossbeam 2 is moved downwards by the fatigue machine control system, approaching the spherical groove 13-3. When the distance between the lower end of the pressure rod 16 and the spherical groove 13-3 is less than or equal to 20cm, the clamp 1 is moved downwards by the fatigue machine displacement control until it is in close contact with the groove. At this time, the fatigue machine sensor can read the pressure reading (1.2N). Then, under the control of the computer control terminal, the fatigue machine drives the clamp 1 to make vertical reciprocating motion, driving the pressure rod 16 to make up-down reciprocating motion, with a displacement range of -2mm. During the downward pressing process of the pressure rod 16, pressure is generated on the ear plate 13, forcing the ear plate 13 and the fork ear 14 to rotate downwards relative to each other. During the upward movement of the pressure rod 16, the pressure is gradually released, and the ear plate 13 and the fork ear 14 swing upwards, returning to the horizontal tension state. One up-and-down reciprocating motion of the pressure rod 16 is one cycle, and the test cycle is 500,000 cycles.

[0061] At the start of the shaft sample oscillation, the corrosion solution (distilled water) is also added from the corrosion solution dripping device. Figure 3The corrosive solution is then dripped evenly and steadily onto the sample. The corrosive solution is stored in a corrosive solution reservoir 20. The reservoir 20 has a sealing cap 19 at its top and is fixed to the crossbeam 2 by a suspension bracket 18. During the test, the corrosive solution is introduced above the sample through a guiding hose 21 and drips onto the ear plate through a needle 24 fixed tightly against the pressure head 16. The corrosive solution flows into the surface of the shaft sample 15 through the gap between the ear plate 13 and the fork ear 14. The dripping speed of the corrosive solution is controlled by a drip rate regulating valve 23 and monitored by a flow rate window 22. The corrosive solution flowing out of the sample drips into a collection container 25 directly below the sample.

[0062] The effect of the shaft connection specimen obtained from the test is as follows: Figure 10 As shown.

[0063] Based on the above-described corrosion and wear testing device for shaft connectors under oscillating conditions, the present invention can also provide a method for testing corrosion and wear of shaft connectors under oscillating conditions, specifically including the following steps:

[0064] Step 1: Loading the shaft sample

[0065] Load the shaft specimen 15 into the specimen fixing system;

[0066] Step 2: Install the sample fixing system

[0067] Install the sample fixing system onto the sample loading platform 27, and adjust the tightness of the first and second high-strength nuts to control the required tensile force;

[0068] Step 3: Loading the fatigue testing machine

[0069] Step 3.1: Control the crossbeam 2 to move downwards, so that the pressure rod 16 approaches the groove 13-3;

[0070] Step 3.2: When the distance between the bottom end of the pressure rod 16 and the groove 13-3 is less than or equal to the preset value D, stop the crossbeam 2 from moving downward and instead control the clamp 1 to move downward until the bottom end of the pressure rod 16 is in close contact with the groove 13-3, and record the pressure value F1 applied by the fatigue testing machine.

[0071] Step 3.3: Control the chuck 1 to move up and down reciprocally to drive the pressure rod 16 to move up and down reciprocally. The displacement amplitude of the pressure rod 16 is controlled to be S. At the same time, the etchant drips evenly and stably from the needle 24 into the shaft sample 15.

[0072] During the downward pressing of the pressure rod 16, pressure is applied to the ear plate 13, forcing the ear plate 13 and the fork ear 14 to rotate downward relative to each other; during the upward moving of the pressure rod 16, the pressure is gradually released, the ear plate 13 and the fork ear 14 swing upward, and the sample fixing system returns to the horizontal tension state.

[0073] During loading, the magnitude of the bending stress on the shaft specimen satisfies:

[0074]

[0075] Where: T is the reading of the tension sensor, b is the width of the lug, a is the width of a single fork lug, and d is the diameter of the shaft sample.

[0076] The above description is merely an example of the implementation of the present invention. The present invention is not limited to the above examples. The above examples and descriptions in the specification only illustrate the principles of the present invention. All equivalent changes and modifications made based on the scope of the present invention should be included within the scope of the present invention.

Claims

1. A corrosion and wear testing device for shaft connectors under oscillating conditions, comprising a fatigue testing machine, a sample loading platform, a corrosion droplet addition-collection system, a sample fixing system, a sample clamp pair, and a shaft sample (15); the sample fixing system is supported by the sample loading platform; the sample clamp pair is loaded in the sample fixing system and located below the loading head of the fatigue testing machine; the corrosion droplet addition-collection system is installed on the fatigue testing machine, and the needle of the corrosion droplet addition-collection system is capable of adding corrosion droplets to the shaft sample; the shaft sample (15) is clamped and installed by the sample clamp pair, and a semi-circular groove (15-1) is provided at one end of the shaft sample (15); characterized in that, The sample clamp assembly includes an ear plate (13), a fork (14), and a limiting piece (26); the sample fixing system includes a tension sensor (10), a first screw (6), and a second screw (12); wherein: One end of the ear plate (13) is clamped and positioned in the fork ear (14) by the shaft sample (15), and the shaft sample (15) is axially and rotationally limited by the limiting piece (26) installed on the outside of the fork ear (14); The fork lug (14) is installed to the sample loading platform via the first screw (6) and locked to the sample loading platform via the first high-strength nut; the other end of the lug plate (13) is installed to the sample loading platform via the tension sensor (10) and the second screw (12) in sequence and locked to the sample loading platform via the second high-strength nut; the first screw (6) and the second screw (12) are collinear; The upper end of the ear plate (13) has a semi-circular groove (13-3); the loading head of the fatigue testing machine has a profile that matches the groove (13-3); The loading head of the fatigue testing machine can move up and down; when the loading head of the fatigue testing machine is pressed down, the loading head of the fatigue testing machine can fit tightly with the groove (13-3); when the loading head of the fatigue testing machine continues to press down, the loading head of the fatigue testing machine can drive the ear plate (13) and the fork ear (14) to rotate relative to each other; when the loading head of the fatigue testing machine moves up, the loading head of the fatigue testing machine and the groove (13-3) gradually separate until the ear plate (13) and the fork ear (14) return to their original positions; During the up-and-down movement of the loading head of the fatigue testing machine, rotational friction occurs between the ear plate (13) and the surface of the shaft specimen (15). The fatigue testing machine includes a crossbeam (2), a base (3), a column, and a loading head, the loading head including a clamp (1) and a pressure bar (16); wherein: The column is fixed on the base (3); the crossbeam (2) is supported above the base (3) by the column, and the crossbeam (2) can move up and down along the column; the pressure rod (16) is suspended below the crossbeam (2) by the clamp (1), and the lower end of the pressure rod (16) has a profile that matches the groove (13-3); The fork lug (14) is fastened to the eye nut (7) provided on the inner end of the first screw (6) by the second shackle (8-b), and the outer end of the first screw (6) is installed on the sample loading platform; the other end of the lug plate (13) is fastened to the first eye screw (9-a) provided on one end of the tension sensor (10) by the first shackle (8-a), and the second eye screw (9-b) provided on the other end of the tension sensor (10) is fastened to the Y-shaped fork (11) provided on the inner end of the second screw (12), and the outer end of the second screw (12) is installed on the sample loading platform; the first screw (6) and the second screw (12) are arranged collinearly.

2. The corrosion and wear testing device for shaft connectors under oscillating conditions according to claim 1, characterized in that, The corrosive liquid dripping-collection system includes a storage tank (20), a liquid guiding hose (21), a flow rate window (22), a drip rate regulating valve (23), and a needle (24). The storage tank (20) contains corrosive liquid. The outlet of the storage tank (20) is connected to the needle (24) through the liquid guiding hose (21). The flow rate window (22) and the flow rate regulating valve (23) are installed sequentially on the liquid guiding hose (21) between the outlet of the storage tank (20) and the needle (24).

3. The corrosion and wear testing device for shaft connectors under oscillating state according to claim 2, characterized in that, The sample loading platform (27) spans the base (3) and is placed longitudinally below the clamp (1). Two steel plates with circular through holes are welded on the symmetrical position between the front and rear double-layer crossbeams of the sample loading platform (27). The first screw (6) and the second screw (12) are respectively connected through the aforementioned two circular through holes. The corrosion droplet addition-collection system also includes a liquid collector (25), which is located below the sample loading platform (27) and can be directly opposite the position of the shaft sample (15).

4. The corrosion and wear testing device for shaft connectors under oscillating state according to claim 3, the sample fixing system, is characterized in that: The magnitude of the bending stress on the shaft specimen satisfies: ； Where: T is the reading of the tension sensor, b is the width of the lug, a is the width of a single fork lug, and d is the diameter of the shaft sample.

5. The corrosion and wear testing device for shaft connectors under oscillating state according to claim 4, characterized in that, The bottom end of the pressure rod (16) is hemispherical, and the diameter of the hemispherical is consistent with the groove (13-3) at the top of the ear plate (13).

6. The corrosion and wear testing device for shaft connectors under oscillating state according to claim 5, characterized in that, The reservoir (20) and the tubing (21) are both made of polyethylene, the flow window (22) and the accumulator (25) are made of borosilicate glass, and the needle (24) is made of polypropylene tube and is connected to the end of the tubing (21).

7. The corrosion and wear testing device for shaft connectors under oscillating state according to claim 6, characterized in that, The corrosive liquid contained in the storage tank (20) is an aqueous solution of acidic, alkaline or neutral solution or an organic solution.

8. The corrosion and wear testing device for shaft connectors under oscillating state according to claim 6, characterized in that, The fork lug (14) is provided with a set of through fork lug holes, corresponding to the first fork lug hole (14-2a) and the second fork lug hole (14-2b); the lug plate is provided with lug plate holes (13-2); the lug plate holes (13-2) of the lug plate are respectively through the first fork lug hole (14-2a) and the second fork lug hole (14-2b) on both sides thereon; The shaft sample (15) with a semi-circular groove (15-1) passes through the second fork ear hole (14-2b), ear plate hole (13-2) and first fork ear hole (14-2a) in sequence, and is fixed by the limiting piece (26) with two screws. The two screws are tightened and fixed at the threaded holes (14-3a) and (14-3b) on the fork ear (14) through the through holes (26-a) and (26-b) on the limiting piece, respectively.

9. A method for testing corrosion and wear of shaft connectors under oscillating conditions, implemented based on the corrosion and wear testing device for shaft connectors under oscillating conditions as described in claim 1, characterized in that... Includes the following steps: Step 1: Loading the shaft sample: Load the shaft specimen (15) into the specimen fixing system; Step 2: Install the sample fixing system Install the sample fixing system onto the sample loading platform (27) and adjust the tightness of the first and second high-strength nuts to control the required tensile force; Step 3: Loading the fatigue testing machine Step 3.1: Control the crossbeam (2) to move downwards so that the pressure rod (16) approaches the groove (13-3). Step 3.2: When the distance between the bottom end of the pressure bar (16) and the groove (13-3) is less than or equal to the preset value D, stop the beam (2) from moving downward and instead control the clamp (1) to move downward until the bottom end of the pressure bar (16) is in close contact with the groove (13-3), and record the pressure value F1 applied by the fatigue testing machine. Step 3.3: Control the chuck (1) to move up and down repeatedly to drive the pressure rod (16) to move up and down repeatedly. The displacement amplitude of the pressure rod (16) is controlled to be S. At the same time, the corrosion liquid is dripped evenly and stably from the needle (24) onto the shaft sample (15). During the downward pressing of the pressure rod (16), pressure is generated on the ear plate (13), forcing the ear plate (13) and the fork ear (14) to rotate downward relative to each other; during the upward moving of the pressure rod (16), the pressure is gradually released, the ear plate (13) and the fork ear (14) swing upward, and the sample fixing system returns to the horizontal tension state; During loading, the magnitude of the bending stress on the shaft specimen satisfies: ； Where: T is the reading of the tension sensor, b is the width of the lug, a is the width of a single fork lug, and d is the diameter of the shaft sample.

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