A high-temperature liquid environment impact-tangential multi-mode fretting wear test method and device

Abstract

The present invention discloses a high-temperature liquid environment impact-tangential multi-mode micro-motion wear test method and apparatus, comprising an optical platform, an air supply device, and an impact loading mechanism, a tangential motion mechanism, a test kettle, a test crucible, and a liquid storage kettle mounted on the optical platform; the impact loading mechanism comprises an impact loading voice coil motor module, an impact shaft, and an impact shaft support assembly; the tangential motion mechanism comprises a tangential motion voice coil motor module, a tangential shaft, and a tangential shaft support assembly; and the test kettle and liquid storage kettle are respectively provided with a test kettle cover and a liquid storage kettle cover. The present invention can test various forms of contact, and the adjustable displacement range of the impact loading module and the tangential motion module is larger than that of existing testing machines in the industry. The test modes can cover micro-motion and sliding ranges, and have a wider range of applications. The present invention can also simulate various liquid environments in the nuclear power field, such as liquid lead bismuth, water, etc., and can regulate the temperature and oxygen content in the environment.

Description

Technical Field

[0001] The invention relates to a high-temperature liquid environment impact-tangential multi-mode fretting wear test method and a device thereof, belonging to the technical field of fretting wear testing. Background Art

[0002] Fretting wear refers to the relative displacement of the contact surface caused by micro-motion due to external vibrations of the contact pair. The contact pair itself only bears local contact loads or fixed prestress. Tangential fretting wear is a type of fretting wear and is widely found in the nuclear industry, electric power, chemical industry, mining machinery, aerospace and other fields, resulting in huge energy consumption and causing huge losses to national property safety and the national economy. However, in the actual operation of many types of machinery, parts are not only subject to tangential wear, but also to impact wear. This type of wear refers to surface damage caused by repeated dynamic contact and collision between two solid surfaces, which will aggravate the wear process of parts.

[0003] Pressurized water reactors (PWRs) are the most widely used nuclear power plant type in the world. Many structural damage incidents within these reactors are directly related to micromotion damage. The world-renowned Chernobyl nuclear accident in the Soviet Union and the Fukushima nuclear accident in Japan both involved this type of reactor. Therefore, research on improving the stability of this type of reactor cannot be underestimated. Furthermore, with the introduction of fourth-generation nuclear power technology, the nuclear power sector has increasingly focused on reactor miniaturization and the corresponding cooling methods. Lead-cooled fast reactors, among others, have garnered widespread attention due to their excellent safety performance and high fuel cycle efficiency. Safety is a key issue in the development of nuclear energy. Nuclear power equipment operates in a fluid medium environment, and micromotion damage is prevalent throughout the system, from fuel assemblies, control rod drive mechanisms, cooling main pump shafts, steam generators, to pipes, flanges, and bolts. Furthermore, nuclear power equipment operates in extreme environments of high temperature, high pressure, and irradiation. Therefore, the micromotion behavior of structures in nuclear energy environments has attracted considerable attention.

[0004] Fretting wear testing machines currently available on the market have a low degree of automation and are generally only capable of performing a single mode of fretting testing. However, in actual operating conditions, components experience fretting wear in a variety of ways. Furthermore, the environments in which structures are exposed to nuclear power are extreme and complex. Current fretting research in extreme environments (such as high temperatures and special fluid environments) is greatly limited by the availability of fretting test equipment capable of performing the required extreme conditions. This led to the development of this test equipment and method. Summary of the Invention

[0005] In order to overcome the defects in the prior art, the present invention aims to provide a high-temperature liquid environment impact-tangential multi-mode fretting wear test method and device.

[0006] The present invention solves the above technical problems and provides a technical solution: a high-temperature liquid environment impact-tangential multi-mode fretting wear test device, comprising an optical platform, an air supply device, and an impact loading mechanism installed on the optical platform, a tangential motion mechanism, a test kettle, a test crucible, and a liquid storage kettle;

[0007] The impact loading mechanism includes an impact loading voice coil motor module, an impact shaft, and two impact shaft support assemblies. The two ends of the impact shaft respectively pass through the test kettle and are slidably mounted on the two impact shaft support assemblies, and one end of the impact shaft is connected to the output end of the impact loading voice coil motor module.

[0008] The tangential motion mechanism includes a tangential motion voice coil motor module, a tangential shaft, and two tangential shaft support assemblies; both ends of the tangential shaft pass through the test kettle and are slidably mounted on the two tangential shaft support assemblies, and one end of the tangential shaft is connected to the output end of the tangential motion voice coil motor module;

[0009] The test crucible is installed in the test kettle, the impact shaft has an impact concave section located in the test kettle, the tangential shaft has a tangential concave section located in the test kettle and above the impact concave section, and the impact concave section and the tangential concave section are respectively provided with an upper sample fixture and a lower sample fixture;

[0010] The liquid storage kettle is connected to the bottom of the test crucible through a pipeline. The height design between the liquid storage kettle and the test crucible is based on the principle of communicating vessels. Under normal pressure, the liquid inside the test crucible can completely flow back to the liquid storage kettle. The test kettle and the liquid storage kettle are respectively provided with a test kettle cover and a liquid storage kettle cover. The test kettle cover and the liquid storage kettle cover are both provided with an air outlet pipe and an air inlet pipe connected to the air supply device.

[0011] A further technical solution is that four lateral flanges are evenly distributed on the inner wall of the test kettle, and a bellows is provided on the lateral flanges. The impact shaft and the tangential shaft pass through the lateral flanges and the bellows respectively, and the impact shaft and the tangential shaft are provided with connecting flanges connected to the end faces of the bellows.

[0012] A further technical solution is that a ceramic heating blanket is provided at the bottom of the test kettle for heating the test crucible; an insulating kettle is provided on the optical platform for insulating and keeping the liquid storage kettle warm, and a heating blanket is provided inside the insulating kettle for heating the liquid storage kettle.

[0013] A further technical solution is that a test kettle cover lifting mechanism and a liquid storage kettle cover lifting mechanism are provided on the optical platform, and the test kettle cover lifting mechanism and the liquid storage kettle cover lifting mechanism are connected to the test kettle cover and the liquid storage kettle cover respectively.

[0014] A further technical solution is that a kettle cover height adaptive adjustment device is provided between the test kettle cover lifting mechanism and the test kettle cover, and between the liquid storage kettle cover lifting mechanism and the liquid storage kettle cover.

[0015] A further technical solution is that an impact buffer device and a tangential buffer device are respectively provided between the impact shaft and the impact-loaded voice coil motor module, and between the tangential shaft and the tangential motion voice coil motor module.

[0016] A further technical solution is that there are two impact shaft support assemblies and two tangential shaft support assemblies, which are arranged opposite to each other on the outer wall of the test kettle.

[0017] A further technical solution is that the impact shaft support assembly includes a receiving block, two linear sliders and a support seat, the two linear sliders are slidably installed on the upper end surface of the support seat, and the receiving block is fixed on the two linear sliders; four through holes are provided inside the receiving block, a V-shaped groove is provided on the upper end surface, and heat dissipation blocks are installed on both sides and the top.

[0018] A further technical solution is that the impact loading mechanism and the tangential motion mechanism are both provided with pressure sensors and grating displacement sensors; the test kettle cover and the liquid storage kettle cover are both provided with pressure gauges, and an oxygen sensor is also provided in the test kettle. The micro-wear test device also includes a host computer and an electronic control system electrically connected to the host computer, and the electronic control system is electrically connected to the pressure sensor, grating displacement sensor, and oxygen sensor respectively.

[0019] A high-temperature liquid environment impact-tangential multi-mode fretting wear test method comprises the following steps:

[0020] Step 1. Install the sample: Remove the test kettle cover, then install the sample in the upper sample fixture and the lower sample fixture respectively. Adjust the position of each shaft and fixture so that the upper and lower samples are in contact and ensure that the sample is not affected by bending stress.

[0021] Step 2: Set up the environment: After tightening the test kettle lid and the liquid storage kettle lid, heat the liquid to the required temperature, press the liquid in the liquid storage kettle into the test crucible through the air inlet pipe, and then close the pipeline valve. Then, adjust the oxygen content in the test kettle through the air supply device as required;

[0022] Step 3: Set the test parameters: Set the impact axis loading parameters, tangential axis motion parameters and test termination conditions in the host computer;

[0023] Step 4. Test loading: The impact loading voice coil motor module and the tangential motion voice coil motor module drive the corresponding impact axis and tangential axis respectively. The impact axis realizes the impact action of the upper and lower samples, and the tangential axis realizes the tangential relative motion of the upper and lower samples.

[0024] Step 5: Test force acquisition and feedback: The grating displacement sensor and pressure sensor on the impact axis measure the normal impact load and displacement of the sample, and the grating displacement sensor and pressure sensor on the tangential axis measure the tangential friction force and displacement of the sample. The loading force, displacement, friction force and other loading force feedback signals are transmitted to the host computer to realize test data storage and processing;

[0025] Step 6, Loading Control: The loading force and displacement feedback signals are compared with the given signal to obtain a primary error signal. The error signal is adjusted by the PID regulator and then driven by the driver to drive the tangential axis and / or impact axis to achieve closed-loop control of the loading force and improve the test accuracy.

[0026] Step 7, test termination: The host computer monitors the signals of each sensor to determine whether the sample has reached the termination condition set in the test, and the test stops;

[0027] Step 8. Take out the sample: After the test stops, the host computer sends a signal, the gas supply device stops supplying gas, and the liquid lead and bismuth in the test crucible in the test kettle will flow back to the liquid storage kettle due to the connecting vessel. The valve between the test kettle and the liquid storage kettle is closed, and the sample is taken out after the temperature returns to room temperature.

[0028] The present invention has the following beneficial effects:

[0029] 1. The present invention can simulate various liquid environments in the nuclear power field, such as liquid lead, bismuth, and water, and can also regulate the temperature and oxygen content in the environment;

[0030] 2. Compared with traditional wear test equipment, the present invention can realize friction and wear testing of friction pairs in three different operation modes: impact, tangential or punching and shearing by changing the operation between the two shafts;

[0031] 3. Based on the multi-channel acquisition system, the loading force, displacement and other data during the test can be measured and recorded in real time, and the interface response data such as friction coefficient, wear amount and dissipated energy in the test can be displayed in real time on the host computer, providing more comprehensive data for studying the friction and wear damage mechanism;

[0032] 4. The present invention can test various forms of contact (such as contact between cylindrical surfaces, contact between cylindrical surfaces and planes, contact between spherical surfaces and planes, contact between planes and planes, etc.). At the same time, the adjustable displacement range of the impact loading module and the tangential motion module is larger than that of existing testing machines in the industry. The test mode can cover micro-motion and sliding ranges, and has a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2This is a front view of the test, liquid storage and drive device of the present invention;

[0035] Figure 3 is a top view of the test, liquid storage and drive device of the present invention;

[0036] Figure 4 It is a left side view of the test, liquid storage and driving device of the present invention;

[0037] Figure 5 A three-dimensional diagram of the support assembly;

[0038] Figure 6 is a three-dimensional diagram of the impact-absorbing device;

[0039] Figure 7 is a three-dimensional diagram of the impact axis;

[0040] Figure 8 is the three-dimensional graph of the tangential axis;

[0041] Figure 9 is a three-dimensional diagram of the lifting mechanism;

[0042] Figure 10 is a three-dimensional diagram of the tangential buffer device;

[0043] Figure 11 is a three-dimensional diagram of the upper specimen fixture;

[0044] Figure 12 A three-dimensional diagram of the lower specimen fixture.

[0045] As shown in the figure: 1-test kettle cover lifting mechanism, 2-impact loading mechanism, 3-liquid storage kettle cover lifting mechanism, 4-air supply device, 5-tangential motion mechanism, 6-test kettle, 7-optical platform, 8-liquid storage kettle, 9-electronic control system, 10-host computer, 11-impact loading voice coil motor module, 12-impact shaft, 13-tangential motion voice coil motor module, 14-tangential shaft, 15-test crucible, 16-upper sample fixture, 17-lower sample fixture, 18-pipeline, 19-pipeline valve, 20-lateral flange, 21-bellows, 22-ceramic heating blanket, 23-radiator, 24-adapter plate, 25-buffered linear bearing, 26-plug screw, 27-upper sample, 28-lower sample, 29-receiving block, 30-linear slider, 31-support seat, 32-through hole, 33-V-shaped slide, 34-heat dissipation block, 35-insulating kettle. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] like Figures 1-12 As shown, a high-temperature liquid environment impact-tangential multi-mode fretting wear test device of the present invention includes an optical platform 7, an air supply device 4, a host computer 10, and an electronic control system 9 electrically connected to the host computer 10, and an impact loading mechanism 2, a tangential motion mechanism 5, a test kettle 6, a test crucible 15, and a liquid storage kettle 8 installed on the optical platform 7;

[0048] The impact loading mechanism 2 includes an impact loading voice coil motor module 11, an impact shaft 12, and two impact shaft support assemblies. The impact shaft 12 is installed in the test kettle 6, with both ends passing through the test kettle 6 and slidably installed on the two impact shaft support assemblies, one end of which is connected to the output end of the impact loading voice coil motor module 11 extending outside the impact shaft support assembly;

[0049] The tangential motion mechanism 5 includes a tangential motion voice coil motor module 13, a tangential shaft 14, and two tangential shaft support assemblies. The tangential shaft 14 is installed in the test kettle 6, with both ends passing through the test kettle 6 and slidably mounted on the two tangential shaft support assemblies. One end of the tangential shaft 14 extends outside the tangential shaft support assembly and is connected to the output end of the tangential motion voice coil motor module 13.

[0050] The impact shaft support assembly and the tangential shaft support are respectively arranged on the outer wall of the test kettle 6;

[0051] The test crucible 15 is installed in the test kettle 6. The impact shaft 12 has an impact concave section located in the test kettle 15. The tangential shaft 14 has a tangential concave section located in the test kettle 15 and above the impact concave section. The impact concave section and the tangential concave section are respectively provided with an upper sample fixture 16 and a lower sample fixture 17.

[0052] The side of the liquid storage kettle 8 is connected to the bottom of the test crucible 15 through a pipe 18. The pipe 18 is provided with a pipe valve 19. The pipe 18 between the test crucible 15 and the liquid storage kettle 8 is based on the principle of a communicating vessel. The height of the bottom of the test crucible 15 is flush with the set height of the liquid storage kettle 8, so that under atmospheric pressure, the liquid can automatically flow back to the liquid storage kettle 8.

[0053] In order to prevent the liquid from solidifying due to temperature drop in the pipe 18, a ceramic heating blanket is wrapped around the pipe 18 to maintain the liquid state;

[0054] The test kettle 6 and the liquid storage kettle are respectively provided with a test kettle cover and a liquid storage kettle cover, and the test kettle cover and the liquid storage kettle cover are both provided with an air outlet pipe and an air inlet pipe connected to the air supply device 4;

[0055] The impact loading mechanism 2 and the tangential motion mechanism 5 are both provided with pressure sensors and grating displacement sensors; the test kettle cover and the liquid storage kettle cover are both provided with pressure gauges, and the test kettle 6 is also provided with an oxygen sensor. The electronic control system 9 is electrically connected to the pressure sensor, grating displacement sensor, and oxygen sensor, respectively, and the electronic control system transmits the data of each sensor to the host computer 10.

[0056] In the present invention, two samples are respectively mounted in the upper sample fixture 16 and the lower sample fixture 17, and then the impact-loading voice coil motor module 11 drives the impact shaft 12 to perform impact motion, and the tangential motion voice coil motor module 13 drives the tangential shaft 14 to perform tangential motion;

[0057] The impact axis 12 and the tangential axis 14 are independent of each other, and both are driven by voice coil motors, which can generate various forms of motion such as sine waves, triangular waves, trapezoidal waves, and rectangular waves. During the test, the action modes of the impact loading module and the tangential motion module can be controlled according to different test requirements to realize impact, tangential or coupled test modes.

[0058] Controlling the operating status of the two axes can achieve multiple test modes:

[0059] 1) Control the impact axis 12 to apply a constant load to the sample, and the tangential axis 14 gives the sample a certain movement form to realize the tangential test mode;

[0060] 2) Control the tangential axis 14 to be stationary, and the impact axis 12 to give the specimen a certain form of movement to realize the impact test mode;

[0061] 3) Control both axes to run in a certain form to achieve impact / tangential coupling test modes;

[0062] The gas supply device 4 supplies gas to the liquid storage kettle 8 to press the liquid therein into the test crucible 15. The host computer 10 uses special control software to set the test loading parameters and liquid temperature and stores and processes the test data, and combines with the electronic control system 9 to realize PID closed-loop control of the test loading, ambient temperature and pressure. The pressure sensors and displacement gratings in the impact loading mechanism 2 and the tangential motion mechanism 5 collect data such as the loading force and the friction force between the samples in real time during the test and transmit them to the host computer 10 for recording and processing, and successively obtain the friction interface response data such as the friction coefficient, wear amount and dissipated energy of the pair during the test.

[0063] The signal generator converts the test parameters into control commands. A comparator generates an error signal between the control command signal and the feedback signals collected by each sensor. This error signal, after PID control, is sent simultaneously to the voice coil motors of the impact loading module and the tangential motion module. These motors are controlled to propel their connected shafts in the direction specified by the command, minimizing the error and aligning the control command target, thus achieving closed-loop control of the test process. Throughout the control process, the regulator continuously adjusts the outputs of the two actuators to minimize the error between their corresponding feedback signals and the set signals.

[0064] In this embodiment, an air supply device 4 is required to adjust the oxygen content in the test kettle 6. Therefore, a preferred implementation is that four lateral flanges 20 are evenly distributed on the inner wall of the test kettle 6, and a bellows 21 is provided on the lateral flanges 20. The impact shaft 12 and the tangential shaft 14 pass through the lateral flanges 20 and the bellows 21 respectively. The impact shaft 12 and the tangential shaft 14 are provided with connecting flanges connected to the end faces of the bellows 21. In this way, the inner cavity of the test kettle 6 is sealed by the connection between the connecting flanges and the end faces of the bellows 21. Specifically, when the two shafts move in the test kettle 6, they can move by simply pulling the bellows 21 to extend or retract.

[0065] In order to further improve the sealing effect, a sealing ring may be provided between the connecting flange and the bellows 21 .

[0066] In this embodiment, a temperature measuring thermocouple and a ceramic heating blanket 22 for heating the test crucible are provided at the bottom of the test kettle; an insulating kettle 35 for insulating and keeping the liquid storage kettle 8 warm is provided on the optical platform 7, and a heating blanket for heating the liquid storage kettle 8 is provided inside the insulating kettle 25.

[0067] In this embodiment, a radiator 23 is provided on the side of the test kettle 6 .

[0068] In this embodiment, in order to facilitate the loading of samples and the replenishment of liquid, the optical platform 7 is provided with a test kettle cover lifting mechanism 1 and a liquid storage kettle cover lifting mechanism 3, and the test kettle cover lifting mechanism 1 and the liquid storage kettle cover lifting mechanism 3 are respectively connected to the test kettle cover and the liquid storage kettle cover; in this way, the test kettle cover and the liquid storage kettle cover are automatically driven to move up and down by the test kettle cover lifting mechanism 1 and the liquid storage kettle cover lifting mechanism 3.

[0069] Among them, the three optical axes in the experimental kettle cover lifting mechanism 1 are symmetrically distributed, the third optical axis (a thicker optical axis) is located in the front, and the other two optical axes, the first and second optical axes, are located on the rear two sides. There is a telescopic rod in the middle of the three optical axes. Above the optical platform 7, a cross roller bearing is installed on the annular lifting mechanism base, and above it is the first mounting plate of the lifting mechanism. The electric cylinder base where the driving electric cylinder connected to the telescopic rod is located is installed under the first mounting plate. Three columns are provided between the first mounting plate and the second mounting plate. The three optical axes are all installed on an optical axis connecting seat at their bottom. The three optical axes pass through the first mounting plate and the second mounting plate in turn, and support the crossbeam together with the telescopic rod at the top. The optical axes pass through the mounting plate or support the crossbeam with a linear bearing solution, while the telescopic rod and the crossbeam adopt a hinged joint method; one end of the crossbeam is connected to the kettle cover.

[0070] In this embodiment, a kettle cover height adaptive adjustment device is provided between the test kettle cover lifting mechanism 1 and the test kettle cover, and between the liquid storage kettle cover lifting mechanism 3 and the liquid storage kettle cover;

[0071] The self-adaptive height adjustment device for the kettle cover includes a lifting flange and a connecting plate. The bottom of the connecting plate is fixed on the kettle cover, and a connecting rod is provided on the upper end. A linear bearing is provided on the lifting flange, and a fixing rod connected to the crossbeam. The connecting rod is installed in the linear bearing, and a bolt is provided on one end of the connecting rod extending to the linear bearing.

[0072] The buffer device uses a type of equidistant stud, which has a screw head and a polished rod with a threaded rod of a certain length at the front end. Four equidistant studs pass through the lifting flange equipped with linear bearings, and their threaded sections are mounted on the bottom mounting plate.

[0073] The function of the height adaptive adjustment device here is that when the lifting mechanism gradually lowers the kettle cover to contact with the test kettle, no other pressure will be generated between the kettle cover and the test kettle due to the lifting displacement of the lifting mechanism. The force between the two is completely provided by the bolts except for gravity.

[0074] In this embodiment, an impact buffer device and a tangential buffer device are respectively provided between the impact shaft 12 and the impact-loaded voice coil motor module 11 , and between the tangential shaft 14 and the tangential motion voice coil motor module 13 .

[0075] The impact buffer device includes a buffer load-bearing block and an adapter plate 24. The buffer load-bearing block is provided with a buffer linear bearing 25 and a cross force transmission shaft connected to the impact shaft 12. The pressure sensor is installed between the cross force transmission shaft and the buffer load-bearing block. The adapter plate is connected to the output shaft of the impact-loaded voice coil motor module 11. The adapter plate is provided with a plug screw 26 installed in the buffer linear bearing 25. The plug screw 26 is sleeved with a spring located between the buffer load-bearing block and the adapter plate 24.

[0076] The tangential buffer device includes a U-shaped plate and a load-bearing block. The U-shaped plate is connected to the tangential motion voice coil motor module 13, and the load-bearing block is connected to the tangential shaft 14. Two pressure sensors are installed at the upper and lower positions between the U-shaped plate and the load-bearing block.

[0077] In this embodiment, the impact shaft support assembly comprises a receiving block 29, two linear sliders 30, and a support base 31. The two linear sliders 30 are slidably mounted on the upper end surface of the support base 31, and the receiving block 29 is fixed to the two linear sliders 30. The receiving block 29 has four through-holes 32 defined within it, a V-shaped slot 33 defined on its upper end surface, and heat sinks 34 mounted on its sides and top. The structure of the tangential shaft support assembly is identical to that of the impact shaft support assembly.

[0078] A high-temperature liquid environment impact-tangential multi-mode fretting wear test method, characterized by comprising the following steps:

[0079] Step 1. Install the sample: Remove the test kettle cover, then install the upper sample 27 and the lower sample 28 in the upper sample fixture 16 and the lower sample fixture 17 respectively. Adjust the positions of the shafts and the fixtures so that the upper and lower samples are in contact and ensure that the samples are not subjected to bending stress.

[0080] Step 2: Set up the environment: After tightening the test kettle lid and the liquid storage kettle lid, heat the liquid to the required temperature, press the liquid in the liquid storage kettle into the test crucible through the air inlet pipe, and then close the pipeline valve 19. Then, adjust the oxygen content in the test kettle through the air supply device as required;

[0081] Step 3, setting test parameters: setting the impact axis loading parameters, tangential axis motion parameters and test termination conditions in the host computer 10;

[0082] Step 4, test loading: The impact loading voice coil motor module 11 and the tangential motion voice coil motor module 13 drive the corresponding impact shaft 12 and tangential shaft 14 respectively. The impact shaft 12 realizes the impact action of the upper and lower samples, and the tangential shaft 14 realizes the tangential relative motion of the upper and lower samples;

[0083] Step 5: Test force acquisition and feedback: The grating displacement sensor and pressure sensor on the impact axis 12 measure the normal impact load and displacement of the sample, and the grating displacement sensor and pressure sensor on the tangential axis 14 measure the tangential friction force and displacement of the sample. The loading force, displacement, friction force and other loading force feedback signals are transmitted to the host computer to realize test data storage and processing;

[0084] Step 6, Loading Control: The loading force and displacement feedback signals are compared with the given signal to obtain a primary error signal. The error signal is adjusted by the PID regulator and then driven by the driver to drive the tangential axis and / or impact axis to achieve closed-loop control of the loading force and improve the test accuracy.

[0085] Step 7, test termination: The host computer 10 determines whether the sample has reached the termination condition set by the test by monitoring the signals of each sensor, and the test is stopped;

[0086] Step 8, taking out the sample: After the test stops, the host computer 10 sends a signal, the gas supply device 4 stops supplying gas, and the liquid lead and bismuth in the test crucible in the test kettle will flow back to the liquid storage kettle due to the communicating vessel, and the pipeline valve 19 between the test kettle and the liquid storage kettle is closed. The sample is taken out after the temperature returns to room temperature.

[0087] The above description does not limit the present invention in any form. Although the present invention has been disclosed through the above embodiments, it is not intended to limit the present invention. Any technician familiar with the profession can use the technical content disclosed above to make some changes or modifications to equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A high-temperature liquid environment impact-tangential multi-mode fretting wear test device, characterized in that: It includes an optical platform, a gas supply device, and an impact loading mechanism, a tangential motion mechanism, a test kettle, a test crucible, and a liquid storage kettle installed on the optical platform; The impact loading mechanism includes an impact loading voice coil motor module, an impact shaft, and two impact shaft support assemblies. The two ends of the impact shaft respectively pass through the test kettle and are slidably mounted on the two impact shaft support assemblies, and one end of the impact shaft is connected to the output end of the impact loading voice coil motor module. The tangential motion mechanism includes a tangential motion voice coil motor module, a tangential shaft, and two tangential shaft support assemblies; both ends of the tangential shaft pass through the test kettle and are slidably mounted on the two tangential shaft support assemblies, and one end of the tangential shaft is connected to the output end of the tangential motion voice coil motor module; The test crucible is installed in the test kettle, the impact shaft has an impact concave section located in the test kettle, the tangential shaft has a tangential concave section located in the test kettle and above the impact concave section, and the impact concave section and the tangential concave section are respectively provided with an upper sample fixture and a lower sample fixture; The liquid storage kettle is connected to the bottom of the test crucible through a pipeline. The height between the liquid storage kettle and the test crucible is designed based on the principle of communicating vessels. Under normal pressure, the liquid inside the test crucible completely flows back to the liquid storage kettle. The test kettle and the liquid storage kettle are respectively provided with a test kettle cover and a liquid storage kettle cover. The test kettle cover and the liquid storage kettle cover are both provided with an air outlet pipe and an air inlet pipe connected to the air supply device. The impact shaft support assembly includes a receiving block, two linear sliders and a support seat, wherein the two linear sliders are slidably mounted on the upper end surface of the support seat, and the receiving block is fixed on the two linear sliders; the receiving block is provided with four through holes inside, a V-shaped slide groove on the upper end surface, and heat dissipation blocks are installed on both sides and the top; An impact buffer device is provided between the impact shaft and the impact-loaded voice coil motor module; wherein the impact buffer device includes a buffer load-bearing block and an adapter plate; the buffer load-bearing block is provided with a buffer linear bearing and a cross force transmission shaft connected to the impact shaft, wherein a pressure sensor is installed between the cross force transmission shaft and the buffer load-bearing block; and the adapter plate is connected to the output shaft of the impact-loaded voice coil motor module; the adapter plate is provided with a plug screw installed in the buffer linear bearing, and the plug screw is sleeved with a spring located between the buffer load-bearing block and the adapter plate; The optical platform is provided with a test kettle cover lifting mechanism and a liquid storage kettle cover lifting mechanism, and the test kettle cover lifting mechanism and the liquid storage kettle cover lifting mechanism are connected to the test kettle cover and the liquid storage kettle cover respectively; A kettle cover height adaptive adjustment device is provided between the test kettle cover lifting mechanism and the test kettle cover, and between the liquid storage kettle cover lifting mechanism and the liquid storage kettle cover; The self-adaptive height adjustment device for the kettle cover includes a lifting flange and a connecting plate. The bottom of the connecting plate is fixed on the kettle cover, and a connecting rod is provided on the upper end. A linear bearing is provided on the lifting flange, and a fixing rod connected to the crossbeam. The connecting rod is installed in the linear bearing, and a bolt is provided on one end of the connecting rod extending to the linear bearing.

2. The high-temperature liquid environment impact-tangential multi-mode fretting wear test device according to claim 1, characterized in that: Four lateral flanges are evenly distributed on the inner wall of the test kettle, and a bellows is provided on the lateral flanges. The impact shaft and the tangential shaft pass through the lateral flanges and the bellows respectively, and the impact shaft and the tangential shaft are provided with connecting flanges connected to the end faces of the bellows.

3. The high-temperature liquid environment impact-tangential multi-mode fretting wear test device according to claim 1, characterized in that: A ceramic heating blanket for heating the test crucible is provided at the bottom of the test kettle; an insulating kettle for insulating and keeping the liquid storage kettle warm is provided on the optical platform, and a heating blanket for heating the liquid storage kettle is provided inside the insulating kettle.

4. The high-temperature liquid environment impact-tangential multi-mode fretting wear test device according to claim 1, characterized in that: A tangential buffer device is provided between the tangential axis and the tangential motion voice coil motor module.

5. The high-temperature liquid environment impact-tangential multi-mode fretting wear test device according to claim 1, characterized in that: Two impact shaft support assemblies and two tangential shaft supports are arranged oppositely on the outer wall of the test kettle.

6. The high-temperature liquid environment impact-tangential multi-mode fretting wear testing device according to claim 1, characterized in that: The impact loading mechanism and the tangential motion mechanism are both provided with pressure sensors and grating displacement sensors; the test kettle cover and the liquid storage kettle cover are both provided with pressure gauges, and an oxygen sensor is also provided in the test kettle. The micro-motion wear test device also includes a host computer and an electronic control system electrically connected to the host computer, and the electronic control system is electrically connected to the pressure sensor, the grating displacement sensor, and the oxygen sensor respectively.

7. A high-temperature liquid environment impact-tangential multi-mode fretting wear test method, characterized in that: The method uses a high-temperature liquid environment impact-tangential multi-mode fretting wear test device as described in any one of claims 1 to 6 to conduct a test, comprising the following steps: Step 1. Install the sample: Remove the test kettle cover, then install the sample in the upper sample fixture and the lower sample fixture respectively. Adjust the position of each shaft and fixture so that the upper and lower samples are in contact and ensure that the sample is not affected by bending stress. Step 2: Set up the environment: After tightening the test kettle lid and the liquid storage kettle lid, heat the liquid to the required temperature, press the liquid in the liquid storage kettle into the test crucible through the air inlet pipe, and then close the pipeline valve. Then, adjust the oxygen content in the test kettle through the air supply device as required; Step 3: Set the test parameters: Set the impact axis loading parameters, tangential axis motion parameters and test termination conditions in the host computer; Step 4. Test loading: The impact loading voice coil motor module and the tangential motion voice coil motor module drive the corresponding impact axis and tangential axis respectively. The impact axis realizes the impact action of the upper and lower samples, and the tangential axis realizes the tangential relative motion of the upper and lower samples. Step 5: Test force acquisition and feedback: The grating displacement sensor and pressure sensor on the impact axis measure the normal impact load and displacement of the sample, and the grating displacement sensor and pressure sensor on the tangential axis measure the tangential friction force and displacement of the sample. The loading force, displacement and friction force feedback signals are transmitted to the host computer to realize test data storage and processing; Step 6, Loading Control: The loading force and displacement feedback signals are compared with the given signal to obtain a primary error signal. The error signal is adjusted by the PID regulator and then driven by the driver to drive the tangential axis and / or impact axis to achieve closed-loop control of the loading force and improve the test accuracy. Step 7, test termination: The host computer monitors the signals of each sensor to determine whether the sample has reached the termination condition set in the test, and the test stops; Step 8. Take out the sample: After the test stops, the host computer sends a signal, the gas supply device stops supplying gas, and the liquid lead and bismuth in the test crucible in the test kettle will flow back to the liquid storage kettle due to the connecting vessel. The valve between the test kettle and the liquid storage kettle is closed, and the sample is taken out after the temperature returns to room temperature.

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