Coating reliability test bench under multi-working condition synchronous coupling action

Abstract

The application discloses a coating reliability test bench under synchronous coupling of multiple working conditions, which comprises a test bench body, a coating reliability test unit and a control cabinet arranged on the test bench body, a reciprocating linear motion station, a continuous rotary motion station and a driving module are arranged in the coating reliability test unit, the reciprocating linear motion station and the continuous rotary motion station are respectively used for mounting a test sample and a test medium, the reciprocating linear motion station and the continuous rotary motion station are connected with the driving module, and the driving module is used for driving the test sample to continuously rotate and reciprocate linearly, and the control cabinet is connected with the driving module, and is used for setting test parameters, and detecting and recording test data in real time. The application can meet synchronous coupling of multiple working conditions of corrosion, wear and fatigue, and can simulate a medium in contact with a test sample in an actual working process by using a test medium.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of surface coating service reliability testing of key parts of engineering equipment, and particularly relates to a coating reliability test bench under the synchronous coupling of multiple working conditions. BACKGROUND

[0002] Engineering equipment is the basic guarantee of national infrastructure, and its service environment and working conditions are generally harsh, and the service reliability of the whole machine and its key parts is required to be high. Surface wear, corrosion, fatigue cracking and other common failure modes of key parts during service significantly affect the service life of the parts and products to some extent. For the above-mentioned surface failure modes, the industry generally uses surface strengthening technology to improve the service reliability, such as surface heat treatment, surface coating, etc.

[0003] Surface coating technologies such as thermal spraying, laser cladding and surfacing can improve the service reliability of the surface of key parts by preparing wear-resistant, corrosion-resistant and fatigue-resistant functional coatings on the surface of key parts, and have been widely used in the surface performance improvement of key parts. However, whether a new type of surface coating technology can meet the service requirements of key parts needs to be tested by strict service reliability testing under simulated service conditions. According to the characteristics of product service conditions, coating service reliability evaluation devices for different key parts have been developed, which can meet the coating service reliability testing under single working conditions such as wear, corrosion and fatigue, as well as wear-corrosion coupling conditions, corrosion-fatigue coupling conditions and other working conditions.

[0004] At present, with the gradual development of engineering equipment towards high-end, its service conditions are becoming more and more severe. The environment of synchronous coupling of multiple working conditions is becoming more and more common, and higher requirements are put forward for the service reliability of key parts under the synchronous coupling of multiple working conditions. The coating and sealing mating pair is a common application scene of engineering equipment, and the service reliability of the coating directly affects the service reliability and life of the product. However, there is currently a lack of effective coating service reliability testing devices that can simulate the synchronous coupling of multiple different working conditions, which cannot meet the coating service reliability testing requirements under severe working conditions, limiting the popularization and application of coating technology in severe environments.

[0005] In the Chinese patent application with the application number CN201810048920.9, a three-point bending corrosion fatigue test of materials under simulated deep-sea high hydrostatic pressure environment is disclosed, the movement speed and movement mode of the pressure head can be controlled by the host, and various waveforms (sine wave, square wave, triangle wave) are used for fatigue loading of the sample. Although the three-point bending fatigue performance test of the sample under the corrosion environment can be realized, the coupling of the wear working condition cannot be realized

[0006] In the Chinese invention patent application with the application number CN202110172284.2, a multifunctional abrasion and wear testing machine for abrasive sliding electrochemical corrosion is disclosed, which includes a loading mechanism, a speed regulating mechanism, a grinding head mechanism, a corrosion chamber, a rack, an electrochemical testing system, a control system, and an experimental data acquisition and display system. It can perform various friction and wear tests such as open sliding, sliding corrosion, and abrasive corrosion sliding, and can also achieve variable speed sliding friction and wear tests. Although it can perform various friction and wear tests such as sliding, sliding-corrosion, and abrasive-corrosion-sliding, and can also achieve variable speed sliding friction and wear tests, it cannot carry out service reliability testing of coatings under simulated fatigue working conditions.

[0007] In the Chinese utility model patent with the application number CN202120613085.6, an electrochemical corrosion reciprocating friction and wear testing device is disclosed, which includes a box body, an electrochemical cell, a sliding groove, a reference electrode, and an auxiliary electrode. The utility model can generate the required transverse grinding marks for experiments, and is used for testing the electrochemical corrosion performance of the surface of parts under friction and wear working conditions. This scheme can generate the required transverse grinding marks for experiments, and is used for testing the electrochemical corrosion performance of the surface of parts under friction and wear working conditions, i.e. it can realize the coupling working condition of wear-corrosion, but it cannot realize the application and simulation of fatigue working conditions.

[0008] In the Chinese invention patent application with the application number CN202211003415.5, a high-frequency fretting corrosion wear testing machine is disclosed. It includes a sample testing cavity, a linear fretting reciprocating motion mechanism, and a test force loading mechanism. The testing machine can meet the service reliability testing of part surface corrosion-wear coupling working conditions under high-frequency movement. The testing machine can meet the service reliability testing of part surface corrosion-wear coupling working conditions under high-frequency movement, but it fails to simulate fatigue working conditions.

[0009] In the Chinese invention patent application with the application number CN202210479922.X, a corrosion working condition simulation test device and test method for rod-shaped parts are disclosed. The test device includes a frame, an electrochemical detection device, a bending load device, a support part, a limiting part, a first driving device, and a second driving device. The device can realize coating service reliability evaluation under corrosion, wear, and fatigue working conditions. The device in this scheme can realize coating service reliability evaluation under corrosion, wear, and fatigue working conditions, but it cannot realize the synchronous application of the above three working conditions, i.e. it cannot simulate the service working condition of corrosion-wear-fatigue synchronous coupling. SUMMARY

[0010] To solve the above problems, the present application provides a coating reliability test bench under multi-working condition synchronous coupling, which can meet the synchronous coupling of various service working conditions and simulate the medium contacted by the test in the actual working process by using the test medium.

[0011] In order to achieve the above technical purposes, achieve the above technical effects, the present application is realized by the following technical solutions:

[0012] A coating reliability test bench under the action of multi-working conditions and synchronous coupling, comprising a test bench body, a coating reliability test unit and a control cabinet arranged on the test bench body;

[0013] The coating reliability test unit comprises a reciprocating linear motion station, a continuous rotary motion station and a driving module;

[0014] The reciprocating linear motion station and the continuous rotary motion station are respectively used for installing a test sample and a test medium;

[0015] The reciprocating linear motion station and the continuous rotary motion station are respectively connected with the driving module, and are used for driving the test sample to continuously rotate and reciprocate linearly;

[0016] The control cabinet is connected with the driving module, and is used for setting test parameters, and real-time detecting and recording test data.

[0017] Optionally, the reciprocating linear motion station power unit comprises a crank slider mechanism, a first test sample fixing seat and a first container;

[0018] The crank slider mechanism comprises a crank and a rocker; the crank is provided with a rocker connecting hole at different distances from the rotation center of the crank; the rocker is length-adjustable, and two ends thereof are respectively connected with the rocker connecting hole and the first test sample fixing seat;

[0019] The first test sample fixing seat is used for fixing the test sample;

[0020] The first container is connected with the first test sample fixing seat, and is used for containing the test sample and the test medium in contact with the test sample;

[0021] The output shaft of the driving module is connected with the rotation center of the crank.

[0022] Optionally, the movement speed V of the test sample under the driving of the reciprocating linear motion station is calculated by the following formula:

[0023]

[0024] In the formula, R is the distance of the rocker connecting hole from the rotation center of the crank, L is the length of the rocker, ω is the rotation angular velocity of the crank, and α is the included angle between the crank and the vertical direction.

[0025] Optionally, the continuous rotary motion station comprises a second test sample fixing seat, a second container and a shaft coupling;

[0026] The second test sample fixing seat is used for fixing the test sample;

[0027] The second container is connected with the second sample holder, and is used for containing a sample and a test medium in contact with the sample;

[0028] One end of the coupling is connected with the second sample holder, and the other end is connected with the output shaft of the driving module.

[0029] Optionally, a sealing fixed plate provided with a sealing element is arranged between the first sample holder and the first container, and between the second sample holder and the second container; the material, structure and contact form between the sealing element and the sample are consistent with an actual product.

[0030] Optionally, a stand is arranged on one side of the first container and the second container, and a cross beam is arranged between the stand and the sample, the cross beam is fixed on the stand, the length of the cross beam can be adjusted, and a rolling bearing is arranged between the cross beam and the sample, so that the sample can freely slide up and down and continuously rotate during the test.

[0031] Optionally, in the reciprocating linear motion mode, when the sample moves to the upper limit position, the distance between the position of the lateral force applied by the cross beam to the sample and the lower end of the sample is L1, when the sample moves to the lower limit position, the distance between the position of the lateral force applied to the sample and the lower end of the sample is L2, and L1 is less than L2, so that the bending stress of the coating at the position of the sealing contact with the sample when the sample moves to the upper limit position is less than that when the sample moves to the lower limit position, and then the periodic change of the bending fatigue stress of the coating on the surface of the sample is realized.

[0032] Optionally, in the continuous rotation mode, the coating at the position of the sealing contact with the sample in the half circle range of the lateral force application is subjected to the action of the tensile stress, and the coating at the position of the sealing contact with the sample in the other half circle range is subjected to the action of the compressive stress, and then the periodic change of the bending fatigue stress of the coating on the surface of the sample during the rotation is realized.

[0033] Optionally, a lateral load applying module is further arranged on the test bench body, the lateral load applying module comprises a horizontal plate, and the horizontal plate is connected with a gas cylinder through a connecting block; a slide rail is further arranged on the horizontal plate, and the slide rail is fixed on the test bench body; during the test, the pressure value of the gas cylinder is calculated according to the size of the lateral force between the coating and the sealing under the actual working condition, and the pressure value is adjusted through a gas pressure adjusting valve to simulate the action of the lateral force in the actual working process.

[0034] Optionally, the driving module comprises a first driving motor and a second driving motor, the first driving motor is matched with the continuous rotation work station to drive the continuous rotation of the sample, and the second driving motor is matched with the reciprocating linear motion work station to drive the reciprocating linear motion of the sample.

[0035] Compared with the prior art, the application has the beneficial effects that:

[0036] The application provides a coating service reliability test bench capable of simulating synchronous coupling under multiple working conditions, which can meet synchronous coupling of three working conditions of corrosion, wear and fatigue, and the corrosion or wear working medium can simulate the actual working process. The test device also has two workstations, which can meet two different motion forms of continuous rotary motion and reciprocating linear motion. At the same time, the test device is also provided with a lateral force applying structure, which can apply a lateral force consistent with the actual working condition, and more truly simulate the actual working condition. The test device can effectively solve the technical problem that the coating service reliability under synchronous coupling of three working conditions of corrosion, wear and fatigue cannot be evaluated, and provide support for the application of new coating process and material. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor, wherein:

[0038] Figure 1 The figure is a schematic diagram of the overall structure of the coating service reliability test bench under synchronous coupling of multiple working conditions according to an embodiment of the application;

[0039] Figure 2 The figure is a schematic diagram of the structure of the reciprocating linear motion workstation structure according to an embodiment of the application;

[0040] Figure 3 The figure is a schematic diagram of the moving speed analysis of the reciprocating linear motion workstation according to an embodiment of the application;

[0041] Figure 4 The figure is a schematic diagram of the structure of the rotary motion workstation structure according to an embodiment of the application;

[0042] Figure 5 The figure is a schematic diagram of the position of the test sample and the sealing connecting plate according to an embodiment of the application;

[0043] Figure 6 The figure is a schematic diagram of the stress analysis of the coating during the test process according to an embodiment of the application;

[0044] Figure 7 The figure is a schematic diagram of the structure of the lateral load applying mechanism according to an embodiment of the application;

[0045] Among them:

[0046] 1 - reciprocating linear motion station, 2 - continuous rotary motion station, 3 - drive module, 4 - control cabinet, 5 - lateral load application module, 6 - specimen, 7 - first specimen holder, 8 - linear bearing holder, 9 - rocker, 10 - curved wheel, 11 - first motor holder, 12 - second drive motor, 13 - second specimen holder, 14 - coupling, 15 - second motor holder, 16 - first drive motor, 17 - second container, 18 - cross beam, 19 - upright, 20 - sealing holder plate, 21 - sealing element, 22 - cylinder, 23 - horizontal plate, 24 - connecting block, 25 - slide rail. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0048] Unless otherwise specifically stated, the relative arrangements of parts and steps, numerical expressions, and numerical values set forth in the various examples herein are only to be used for illustrative purposes and are not to be construed as limiting of this application. Furthermore, it is to be understood that the drawings are not to scale and that actual dimensions can be larger or smaller than as shown. Techniques, methods, and apparatus known to those of ordinary skill in the art can not be discussed in detail herein. Any and all examples noted herein and throughout the specification are provided for explanatory purposes and do not limit the scope or application of the application. Therefore, other examples of the exemplary embodiments can include different values for the components and steps. It is to be understood that like numerals and letters throughout the drawings denote like items and that further discussion of the same can not be necessary in subsequent drawings.

[0049] In the description of the present application, if one or more of several meanings, the meaning of more than two is more than two, greater than, less than, more than, etc. is not included in the number, above, below, etc. is understood to include the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0050] In the description of the application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0051] The application principle of the application will be described in detail below in combination with the drawings.

[0052] As Figure 1 The structure of the coating reliability test bench under the action of multi-working condition synchronization coupling is shown in the figure, including a test bench body, a coating reliability test unit and a control cabinet 4 arranged on the test bench body.

[0053] The coating reliability test unit includes a reciprocating linear motion station 1, a continuous rotary motion station 2 and a driving module 3.

[0054] The reciprocating linear motion station 1 and the continuous rotary motion station 2 are respectively used for mounting a sample 6 and a test medium; the sample 6 is a coating sample.

[0055] The reciprocating linear motion station 1 and the continuous rotary motion station 2 are respectively connected with the driving module 3, for driving the sample 6 to continuously rotate and reciprocate linearly.

[0056] The control cabinet 4 is connected with the driving module 3, for setting test parameters, and for real-time detection and recording of test data (test times, friction data, etc.)

[0057] In the specific implementation process, as Figure 1 The coating reliability test unit is arranged in two layers, the lower layer is the driving module 3 for realizing continuous rotation and reciprocating linear motion, and the upper layer is a service reliability test sample clamping system, i.e. the continuous rotary motion station 2 and the reciprocating linear motion station 1. The continuous rotary motion station 2 and the reciprocating linear motion station 1 are arranged in a vertical manner and side by side in the reliability test station.

[0058] The reciprocating linear motion station 1 in the application is mainly used for simulating the coating service reliability under linear motion. In one specific embodiment of the application, as Figure 2As shown, the reciprocating linear motion adopts vertical motion form, the power unit adopts servo motor driving (i.e. the driving module 3 includes a servo motor, i.e. the second driving motor 12), and the servo motor is fixed on the truss at the bottom of the test bench body through the first motor fixing seat 11. The up-down reciprocating linear motion is realized by using a crank slider mechanism, i.e. the servo motor drives the continuous rotation of the crank wheel 10, and then drives the first sample fixing seat 7 and the sample 6 to move up and down linearly through the rocker 9. The crank wheel 10 is designed with rocker 9 connecting holes at different distances from the rotation center of the crank wheel 10, and the length of the rocker 9 can be adjusted by adjusting the screw thread position. Therefore, by adjusting the length of the rocker 9 and the position of the rocker 9 connecting hole on the crank wheel 10, the reciprocating linear motion stroke of the sample 6 during the test process can be adjusted.

[0059] As shown in the figure, Figure 3 The distance between the rocker 9 connecting hole on the crank wheel 10 and the center of the crank wheel 10 is R, the length of the rocker 9 is L, and the rotation angular velocity of the crank wheel 10 under the driving of the servo motor is ω. α is the included angle between the crank and the vertical direction. Through calculation and analysis, it can be obtained that the reciprocating linear motion speed V of the sample 6 under the driving of the crank slider mechanism is

[0060]

[0061] As can be seen from the above calculation formula, by adjusting the motor rotation speed ω, the length of the rocker 9 L, and the distance R between the rocker 9 connecting hole and the center of the crank wheel 10, the reciprocating linear motion speed V of the sample 6 can be adjusted, and then the coating reliability test evaluation under different moving speed conditions can be simulated.

[0062] The continuous rotation motion station 2 in the application is mainly used for simulating the service reliability of the coating under rotary motion form. As shown in the figure, Figure 4 In one specific embodiment of the embodiment of the application, the driving module 3 further includes a driving motor (i.e. the first driving motor 16), and the driving motor is fixed on the second motor fixing seat 15. The driving motor and the second sample fixing seat 13 are connected by a shaft coupling 14. During the test process, the speed of the driving motor is set according to the rotation speed of the part in the actual working condition.

[0063] In order to simulate the synchronous coupling effect of the surface coating of the key part under wear, corrosion and fatigue in the actual working process, the application designs a Figure 5The connection structure between the sample coating and the seal is shown. The sample 6 is connected to the first sample fixing seat 7 and the second sample fixing seat 13 of the continuous rotation and reciprocating linear two stations by a threaded connection. Each test station is provided with a container (first and second containers 17), which can place the test medium, and the test medium is consistent with the working medium in the actual product working process. The lower part of the container is provided with a sealing fixing plate 20 for installing a sealing element 21. The material, structure and contact form between the sealing element 21 and the sample 6 are consistent with the actual product. One side of the container in the two stations is provided with a stand 19, and the stand 19 is connected between the sample 6 and the sample 6 by a cross beam 18. The cross beam 18 is fixed on the stand 19, and the length of the cross beam 18 can be adjusted. The cross beam 18 and the sample 6 are connected by a rolling bearing, which can ensure the free sliding and continuous rotation of the sample 6 during the test process.

[0064] During the test process, the matching form between the coating sample 6 and the seal is consistent with the actual product, which can simulate the working medium such as sand and hard particles entering the coating and seal matching pair during the continuous rotation and reciprocating linear motion process, and then evaluate the wear resistance of the coating on the surface of the sample 6 under the simulated actual wear condition. At the same time, the surface coating of the sample 6 is in contact with the test medium in the container during the test process, which can simulate the corrosion performance evaluation of the coating under the actual working corrosion condition. At the same time, the length of the cross beam 18 can be adjusted to apply the required lateral force, and then the cyclic bending stress is applied to the surface coating of the sample 6 during the test process, and the fatigue resistance evaluation of the coating is realized.

[0065] As shown in the figure, Figure 6 When the sample 6 moves to the upper limit position, the lateral force position applied by the cross beam 18 to the sample 6 is L1 away from the lower end of the sample 6, and when the sample 6 moves to the lower limit position, the lateral force position is L2 away from the lower end of the sample 6. As can be seen from the figure, L1 is less than L2, which causes the bending stress of the coating at the contact position between the sample 6 and the seal when the sample 6 moves to the upper limit position to be less than that when the sample 6 moves to the lower limit position, that is, the bending stress of the coating at the contact position between the sample 6 and the seal during the test process is always periodically changed, and then the cyclic bending fatigue stress is applied to the surface coating of the sample. In the continuous rotation motion form, the coating at the contact position between the sample 6 and the seal in the half circle range of the lateral force application is subjected to tensile stress, and vice versa, the coating in the other half circle range is subjected to compressive stress, and then the cyclic bending fatigue stress is applied to the surface coating of the sample during rotation. Therefore, with the continuous rotation of the sample 6, the bending stress of the coating at the contact position between the sample 6 and the seal during the test process is always periodically changed. Therefore, the test bench can simulate the fatigue resistance reliability of the coating under the actual periodic cyclic loading condition.

[0066] During actual service, the coating and seal interfitting pair also needs to bear the lateral load during the service process, thereby exacerbating the wear of the coating. In one specific embodiment of the embodiment of the present application, a lateral load applying module 5 is also designed on the test bench body, and the structure thereof is as shown in Figure 7 The container, the sealing element 21 and the sealing fixed plate 20 of each station are fixed on the horizontal plate 23, and the horizontal plate 23 is connected with the air cylinder 22 through the connecting block 24. Meanwhile, the horizontal plate 23 is installed with the slide rail 25, and the slide rail 25 is fixed on the truss of the test bench body. During the test, the pressure value of the air cylinder 22 is calculated according to the lateral force between the coating and the seal under the actual working condition, and is adjusted through the gas pressure adjusting valve, thereby the action of the lateral force during the actual working process can be simulated.

[0067] The control cabinet 4 is used for setting the test parameters and detecting and recording the test data. The test parameters mainly include the reciprocating linear motion speed or continuous rotation speed of the sample 6, the lateral force air cylinder pressure, the test time, the test revolution number and the like. During the test process, the force sensor can detect the friction force between the coating and the sealing element 21 in the process of the up-down reciprocating linear motion and the continuous rotation motion in real time, and can draw the friction curve in real time. Meanwhile, the control system can also record the test number, the actual test speed, the lateral load value and the like in real time.

[0068] The test method and process of the coating reliability test bench under the multi-working condition synchronous coupling action in the present application will be described in detail as follows.

[0069] Before the test, the coating sample 6 is prepared according to the coating material and process of the actual product, and the sealing structure of the test bench is designed according to the actual sealing material and sealing structure of the product. The coating sample 6, the sealing element 21, the sealing fixed plate 20, the container and the like are installed on the horizontal plate 23. According to the composition characteristics of the working medium in the actual service process, the test medium is prepared and added to the container. According to the size of the lateral force in the service process, the cylinder pressure value is calculated. The cross beam 18 is fixed on the stand column 19 and the coating sample 6 respectively, and the length of the cross beam 18 is adjusted according to the size of the fatigue load. The test bench control system is opened, and the test parameters such as test speed, test time or number of revolutions are set. Start the test bench to start the test, and the test bench detects the friction force, test time and other parameters in real time during the test. During the test, the coating needs to withstand the synchronous coupling effect of the corrosion of the test medium in the container, the wear caused by the test medium entering the matching pair and the cyclic bending stress under the action of the lateral force. The service reliability of the coating is evaluated by multi-dimensional evaluation index parameters. On the one hand, the index parameters change with time, that is, the coating and the sealing friction force value, the coating corrosion area, the coating fatigue crack change with time, the test time when the coating wear, corrosion and fatigue failure occur is recorded, that is, the fault-free working time, and then the service reliability of different coatings is analyzed. On the other hand, the corrosion, wear and fatigue cracking of the surface of different coatings after a certain test time are analyzed, the failure severity of different coatings is compared and analyzed, and then the service reliability of the coating is evaluated.

[0070] The coating reliability test bench under the synchronous coupling of multiple working conditions is described in detail in combination with a specific embodiment.

[0071] The power head is an important working device of the rotary drilling rig product, which plays a function of power transmission during the working process. Since the power head mainly relies on gears for power transmission, the inner cavity of the box contains a large amount of hydraulic oil or lubricating oil. In order to prevent the entry of foreign hard particles and the like into the interior of the power head to cause oil pollution, a sealing structure is designed on both sides of the connecting shaft of the power head, and the connecting shaft and the sealing matching surface are strengthened by using surfacing and laser cladding stainless steel coating technology. In the actual working process, the power head is easy to contact with external substances such as mud rich in hard particles and corrosive medium, thereby causing wear and corrosion failure of the coating. At the same time, the continuous rotation of the drill rod during the working process causes the connecting shaft surface coating to bear lateral force and bending fatigue stress. Therefore, according to the above analysis, the connecting shaft surface coating bears the synchronous coupling effect of corrosion, wear and fatigue during the working process.

[0072] The coating reliability test bench designed by the present application tests the reliability of three different new coatings. The coating material is martensitic stainless steel, which is prepared by using plasma surfacing, wire surfacing and laser cladding technology respectively. The size of the coating sample 6 is The coating surface roughness is finally ground to Ra0.8μm, and the sample 6 is clamped to the continuous rotation test station after being prepared. The sealing material matched with the coating sample 6 is consistent with the actual product, and the sealing material is polyurethane. The hole size matched with the outer diameter of the sealing ring is The hole size matched with the inner hole of the sealing ring is The width of the sealing ring is 12(0, +0.2)mm. After the sample 6 is clamped, the cross beam 18 is fixed on the column 19 and the sample 6, respectively, and the length of the cross beam 18 is adjusted according to the fatigue load value. At the same time, the required lateral force value in the test process is calculated according to the lateral force value per unit area of the coating in the actual service process, and the required air pressure is calculated according to the size of the air cylinder 22. After the sample 6 is clamped and the air cylinder pressure and the length of the cross beam 18 are set, the test medium is added to the container. The control system is opened, the test parameters are set, and the test station is started.

[0073] After the test is completed, the friction curves of different coatings are compared and analyzed, and the time when the friction curve changes is recorded. The longer the time, the higher the service reliability of the coating. At the same time, the corrosion area of the coating surface after the same test time is compared and analyzed. The larger the corrosion area, the lower the corrosion reliability of the coating. Further, the cracking of the coating is observed and analyzed by using a portable microscope. The more cracks, the lower the fatigue resistance of the coating. Through the comparison and analysis of the three coatings after the test, the final result shows that the laser cladding martensitic stainless steel coating has the best service reliability under the synchronous coupling of wear, corrosion and fatigue.

[0074] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the protection scope of the present application.

[0075] The basic principles and main features of the present application and the advantages of the present application have been shown and described. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A coating reliability test bench under multi-condition synchronous coupling, characterized in that: The test bench body, a coating reliability test unit and a control cabinet are arranged on the test bench body; The coating reliability test unit comprises a reciprocating linear motion station, a continuous rotary motion station and a driving module; the continuous rotary motion station comprises a second sample fixing seat, a second container and a shaft coupling; the reciprocating linear motion station comprises a crank slider mechanism, a first sample fixing seat and a first container; The reciprocating linear motion station is used for installing a sample and a test medium, and the continuous rotary motion station is used for installing a sample and a test medium; The reciprocating linear motion station and the continuous rotary motion station are respectively connected with the driving module, and are used for driving the sample to continuously rotate and reciprocate linearly. The control cabinet is connected with the driving module, and is used for setting test parameters, and detecting and recording test data in real time. Sealing fixing plates for installing sealing elements are arranged between the first sample fixing seat and the first container, and between the second sample fixing seat and the second container; the material, structure and contact form between the sealing elements and the sample are consistent with those of an actual product. A vertical column is arranged on one side of the first container and the second container; a cross beam is arranged between the vertical column and the sample; the cross beam is fixed on the vertical column, and the length of the cross beam can be adjusted; a rolling bearing is arranged between the cross beam and the sample, and is used for ensuring that the sample can freely slide up and down and continuously rotate during the test. A lateral load applying module is further arranged on the test bench body; the lateral load applying module comprises a horizontal plate and a connecting block; the connecting block is connected with a cylinder; a slide rail is further arranged on the horizontal plate; and the slide rail is fixed on the test bench body; during the test, the pressure value of the cylinder is calculated according to the lateral force between the coating and the sealing element under actual working conditions, and the pressure value is adjusted through a gas pressure adjusting valve to simulate the effect of the lateral force in the actual working process.

2. The multi-working-condition synchronous coupling reliability test bench according to claim 1, characterized in that: The crank slider mechanism comprises a crank and a rocker; the crank is provided with rocker connecting holes with different distances from the rotation center of the crank; the length of the rocker can be adjusted, and the two ends of the rocker are connected with the rocker connecting holes and the first sample fixing seat respectively; The first sample fixing seat is used for fixing a sample; The first container is connected with the first sample fixing seat, and is used for containing a sample and a test medium in contact with the sample; The output shaft of the driving module is connected with the rotation center of the crank.

3. The multi-condition synchronous coupling reliability test bench of claim 2, wherein, The speed of the movement of the test specimen under the drive of the reciprocating linear movement station This is calculated by the following equation: ， In the formula, is the distance from the rocker connecting hole to the rotation center of the curved wheel, is the length of the rocker, is the rotation angular velocity of the curved wheel, is the angle between the crank and the vertical direction.

4. The multi-condition synchronous coupling reliability test bench according to claim 2, characterized in that: The second sample fixing seat is used for fixing a sample; The second container is connected with the second sample fixing seat, and is used for containing a sample and a test medium in contact with the sample; One end of the shaft coupling is connected with the second sample fixing seat, and the other end is connected with the output shaft of the driving module.

5. The multi-condition synchronous coupling reliability test bench according to claim 1, characterized in that: In the reciprocating linear motion mode, when the sample moves to the upper limit position, the distance between the position where the cross beam applies the lateral force to the sample and the lower end of the sample is L1, and when the sample moves to the lower limit position, the distance between the position where the lateral force is applied and the lower end of the sample is L2, and L1 is less than L2, so that the bending stress of the coating at the position where the sample contacts the sealing element when the sample moves to the upper limit position is less than that when the sample moves to the lower limit position, thereby realizing the periodic change of the bending fatigue stress of the coating on the surface of the sample.

6. The multi-condition synchronous coupling reliability test bench according to claim 1, characterized in that: In the form of continuous rotation movement, the coating at the contact position between the sample and the sealing element in the half circle range of lateral force application is subjected to tensile stress, and the coating in the other half circle range is subjected to compressive stress, thereby realizing the periodic change of bending fatigue stress on the coating surface of the sample in the rotation process.

7. The multi-condition synchronous coupling reliability test bench according to claim 1, characterized in that: The driving module comprises a first driving motor and a second driving motor, the first driving motor is matched with the continuous rotation movement station to drive the continuous rotation of the sample, and the second driving motor is matched with the reciprocating linear movement station to drive the reciprocating linear movement of the sample.

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