An experimental device for simulating tangential fretting wear in a high-temperature liquid metal environment

Abstract

This invention discloses an experimental apparatus for simulating tangential fretting wear in a high-temperature liquid metal environment, belonging to the field of material physical property analysis and testing technology. It includes a lower and upper clamp located within a high-temperature reactor, a horizontally arranged drive shaft and friction drive shaft, a friction force measuring mechanism for measuring the axial force on the friction drive shaft, and a vertically arranged loading rod capable of free axial movement. One end of the hinge shaft is hinged to the friction drive shaft, and the other end is connected to the upper clamp. The drive shaft drives the lower clamp in reciprocating linear motion, and the drive shaft, hinge shaft, and loading rod are located in the same vertical plane. In this invention, the upper clamp does not move horizontally during the experiment, and it experiences only one horizontal force—the frictional force between the two abraded samples. Therefore, the frictional force between the abraded samples can be accurately measured by the axial force borne by the friction drive shaft.

Description

Technical Field

[0001] This invention relates to the field of material physical property analysis and testing technology, as well as the field of fretting wear technology, and particularly to the study of the fretting erosion behavior mechanism of lead / lead-bismuth fast reactor structural materials under high temperature extreme environment, specifically a tangential fretting wear experimental device simulating a high temperature liquid metal environment. Background Technology

[0002] During reactor operation, the high-speed flow of the lead-bismuth alloy cooling medium within the reactor can cause erosion at the contacting steel interfaces. Currently, experimental equipment exists for studying the fretting erosion of materials in a high-temperature lead-bismuth environment, but it cannot accurately capture stable and realistic tangential frictional forces.

[0003] The Russian Academy of Sciences has developed an abrasion device for a high-temperature liquid lead environment, and patent publication number CN117347209A discloses a micro-motion abrasion experimental device for simulating a lead-bismuth environment. Its tangential friction force sensor is set on a tangentially reciprocating drive rod. In order to prevent the liquid alloy from leaking, a dynamic seal is set between the drive shaft and the tube wall. Therefore, during the operation of the device, the force measured is the resultant force of the tangential friction force of the sample, the inertial force of the slider, and the friction force between the drive shaft and the tube wall. Moreover, none of these forces can be measured individually. Therefore, it is difficult to accurately measure the tangential friction force. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an experimental device for simulating tangential fretting wear in a high-temperature liquid metal environment. This invention can provide a stable and reliable normal load and measure a more realistic and reliable tangential friction force.

[0005] The specific solution of the present invention is as follows:

[0006] An experimental apparatus for simulating tangential fretting wear in a high-temperature liquid metal environment includes:

[0007] High temperature autoclave;

[0008] Heating and temperature control mechanism used to control the temperature inside a high-temperature reactor;

[0009] The lower and upper clamps are located inside the high-temperature reactor. Each clamp holds one abrasive sample, and the two abrasive samples are in contact after clamping.

[0010] A horizontally arranged drive shaft has one end fixedly connected to the lower clamp, and the other end passes through the side wall of the high-temperature reactor and is slidably and sealed to it.

[0011] The first power device used to drive the drive shaft to move linearly back and forth in a horizontal plane;

[0012] A friction drive shaft parallel to the drive shaft, with one end located in the gas phase of the high-temperature reactor and the other end passing through and slidingly connected to the side wall of the high-temperature reactor;

[0013] The hinge shaft located inside the high-temperature reactor has one end hinged to the friction drive shaft via a rotating shaft, and the other end connected to the upper clamp.

[0014] Friction measuring mechanism used to measure the axial force on a friction drive shaft;

[0015] A vertically arranged loading rod that can move freely along the axial direction has its centerline passing through the contact area of ​​two abrasive specimens.

[0016] Axial compression mechanism used to apply axial force to the loading rod;

[0017] The drive shaft, hinge shaft, and loading rod are located in the same vertical plane, and the upper clamp is located above the lower clamp.

[0018] In one specific embodiment of the invention, a parallelogram structure consisting of four rods hinged end-to-end is also included. The parallelogram structure, the hinge shaft, and the friction drive shaft are located in the same plane. The end of the hinge shaft opposite to the friction drive shaft is parallel to and fixedly connected to one side of the parallelogram structure. The bottom edge of the parallelogram structure is fixedly connected to the upper clamp, and the lower end of the loading rod is directly opposite the top edge of the parallelogram structure. This ensures that the contact area between the two abrasive samples does not change with temperature, allowing for the determination of the effect of different temperatures on the friction force.

[0019] In one specific embodiment of the present invention, the drive shaft is slidably sealed to the side wall of the high-temperature reactor via a sealing mechanism, the sealing mechanism comprising:

[0020] The first bushing is arranged horizontally, with one end passing through the side wall of the high-temperature reactor and being sealed to it. The drive shaft is located inside the first bushing and is clearance-fitted to it.

[0021] The sealing bellows located at the end of the first bushing away from the high-temperature vessel has one end sealed to the first bushing and the other end sealed to the drive shaft.

[0022] An electric heating wire used to heat the liquid metal between the drive shaft and the first bushing;

[0023] Thermocouple used to measure the temperature of the liquid metal between the drive shaft and the first bushing.

[0024] This invention uses a sealed bellows seal, which can achieve 100% sealing. At the same time, through the cooperation of thermocouples and electric heating wires, the temperature of the first bushing can be controlled to be slightly higher than the freezing point but much lower than the temperature inside the high-temperature reactor. This helps to reduce the temperature of the sealed bellows while ensuring the normal movement of the drive rod, thus extending the seal life.

[0025] As a specific embodiment of the present invention, the friction force measuring mechanism includes:

[0026] The second bushing is arranged horizontally, with one end located in the gas phase of the high-temperature reactor and the other end passing through and sealingly connected to the side wall of the high-temperature reactor; the friction drive bushing is located inside the second bushing.

[0027] The steel ball sleeve located between the second bushing and the friction drive shaft is used to reduce the resistance to the movement of the friction drive shaft;

[0028] The cooling water jacket is located on the outer wall of the second bushing;

[0029] A fixed rod is arranged coaxially with the friction drive shaft, and the position of the fixed rod is fixed.

[0030] A piezoelectric force sensor located between and in contact with both a fixed rod and a friction drive shaft;

[0031] The present invention provides a steel ball sleeve between the second bushing and the friction drive shaft. On the one hand, this can greatly reduce the friction force on the friction drive shaft itself. On the other hand, this can reduce the gas flow cross-section between the second bushing and the friction drive shaft, thereby reducing the amount of gas leakage in the high-temperature reactor.

[0032] As a specific embodiment of the present invention, the axial compression mechanism includes:

[0033] Weights;

[0034] Linear ball guides, including:

[0035] A second linear guide rail is vertically arranged and fixed on the upper surface of the high-temperature reactor;

[0036] The L-shaped slider is slidably connected to the second linear guide rail via ball bearings. The upper end of the loading rod is fixedly connected to the L-shaped slider, and the lower end passes through the upper end face of the high-temperature reactor and is fitted with it with a clearance.

[0037] The weights are detachably placed on the L-shaped slider.

[0038] As a specific embodiment of the present invention, it also includes:

[0039] A position sensor is used to collect position information of a certain part of the drive shaft;

[0040] The second controller receives information from the position sensor and analyzes it to obtain the stroke of the drive shaft. Then, it adjusts the load of the first power device according to the difference between the actual stroke and the preset stroke. Beneficial effects

[0041] In this invention, the friction drive shaft is connected to the upper clamp via a hinge shaft. The upper clamp can transmit forces in both the vertical and horizontal directions, and the magnitude and direction of the force do not change during transmission. Therefore, the pressure between the two abrasive samples can be accurately determined by the axial force of the loading rod. The reciprocating movement of the drive shaft causes the two abrasive samples to rub against each other. The frictional force between the two abrasive samples is a horizontal force. The upper clamp does not move horizontally during the experiment, and the upper clamp is subjected to only one horizontal force, namely the frictional force between the two abrasive samples. Therefore, the frictional force between the abrasive samples can be accurately measured by the axial force borne by the friction drive shaft. Attached Figure Description

[0042] Figure 1 This is a three-dimensional structural schematic diagram of an experimental device for simulating tangential fretting wear in a high-temperature liquid metal environment according to one embodiment of the present invention;

[0043] Figure 2 yes Figure 1 The front view;

[0044] Figure 3 yes Figure 2 Enlarged view of part A in the middle;

[0045] Figure 4 yes Figure 1 Schematic diagram of the structure of the medium-high temperature reactor;

[0046] Figure 5 yes Figure 1 A schematic diagram showing the relative positions of the drive shaft, friction drive shaft, and loading rod.

[0047] Figure 6 yes Figure 1 A schematic diagram of the upper and lower clamps holding the abrasive sample;

[0048] Figure 7 yes Figure 1 Schematic diagram of the central axial compression mechanism;

[0049] Figure 8 yes Figure 1 Schematic diagram of the middle sealing mechanism;

[0050] Figure 9 This is a schematic diagram of the hinge shaft and parallelogram structure in another embodiment of the present invention;

[0051] In the figure, the components are: high-temperature reactor 100; reactor lid 101; insulation cotton 110; support shell 120; abrasive sample 201; lower clamp 210; upper clamp 220; fixed seat 230; drive shaft 310; friction drive shaft 320; hinge shaft 321; loading rod 330; first power device 400; second bushing 510; steel ball sleeve 520; piezoelectric force sensor 530; fixed rod 540; cooling water jacket 550; ceramic heating ring 600; axial pressure mechanism 700; second linear guide rail 710; L-shaped slider 720; weight 730; sealing mechanism 800; first bushing 810; sealing bellows 820; electric heating wire 830; thermocouple 840; heat insulation material 850; protective shell 860; heat sink 870; position sensor 880; and quadrilateral structure 900. Detailed Implementation

[0052] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0053] Please refer to Figures 1-8This invention illustrates the structure of a specific embodiment of the experimental apparatus for simulating tangential fretting wear in a high-temperature liquid metal environment. The experimental apparatus of this invention includes a base, a support frame, a high-temperature reactor 100, a lower clamp 210, an upper clamp 220, a drive shaft 310, a friction force transmission shaft 320, a loading rod 330, a first power device 400, a friction force measuring mechanism, a ceramic heating ring 600, an axial pressure mechanism 700, and a sealing mechanism 800. The base and support frame are used to support and carry various equipment components. The high-temperature reactor 100 is used to store lead-bismuth alloy and tubular abrasion samples 201. To facilitate the entry and exit of abrasion samples 201 and other items from the high-temperature reactor 100, a removable reactor lid 101 is provided on the top of the high-temperature reactor 100. The heating and temperature control mechanism is used to control the temperature inside the high-temperature reactor 100, so that the lead-bismuth alloy is liquefied and the temperature of the liquid alloy is kept stable during the experiment. The upper clamp 220 and the lower clamp 210 are both located inside the high-temperature reactor 100, each clamping one abrasion sample 201. After clamping, the two abrasion samples 201 abut against and are immersed in the liquid alloy. One purpose of this experimental device is to measure the frictional force between the two abrasion samples 201. The drive shaft 310 is arranged horizontally, with one end fixedly connected to the lower clamp 210 and the other end passing through... The high-temperature reactor 100 is sealed to the side wall of the reactor; the first power device 400 is used to drive the drive shaft 310 to move linearly back and forth in the horizontal plane, so that the two abrasive samples 201 rub against each other; the friction drive shaft 320 is located above the drive shaft 310 and parallel to it; the hinge shaft 321 is located inside the high-temperature reactor 100, one end of which is connected to the end of the friction drive shaft 320 inside the high-temperature reactor 100, and the other end is fixedly connected to the upper clamp 220; the friction force measuring mechanism is used to measure the axial force on the friction drive shaft 320, that is, the friction force between the two abrasive samples 201; the loading rod 330 is arranged vertically and can move freely along the axial direction, and its center line passes through the contact area of ​​the two abrasive samples 201; the axial pressure mechanism 700 is used to apply axial force to the loading rod 330. In this invention, the upper clamp 220 is located above the lower clamp 210, and the friction drive shaft 320 is located above the contact area of ​​the two abrasive samples 201. The drive shaft 310, the friction drive shaft 320, the loading rod 330, and the hinge shaft 321 are located in the same vertical plane. Therefore, when the loading rod 330 moves downward, it will abut against the hinge shaft 321, the upper clamp 220, or the abrasive sample 201 held by the upper clamp 220, thereby transmitting pressure to the contact area of ​​the abrasive sample 201. The axial pressure mechanism 700 adjusts the pressure between the two abrasive samples 201. The first power device 400 drives the drive shaft 310 to move back and forth, thereby causing the abrasive sample 201 held by the lower clamp 210 to move back and forth. The friction force borne by the two abrasive samples 201 is a pair of interacting forces. However, the upper clamp 220 does not move during the experiment and only bears friction force in the horizontal direction. Therefore, the axial force measured by the friction force transmission shaft 320 in this invention is the friction force borne by the abrasive sample 201.

[0054] The specific configuration of the heating and temperature control mechanism in this invention can be selected as needed. For example, in some embodiments, the heating and temperature control mechanism includes a ceramic heating coil 600, a thermocouple, and a first controller. The ceramic heating coil 600 is disposed at the bottom of the high-temperature vessel 100 and is used to heat the high-temperature vessel 100. The thermocouple is used to detect the temperature of the liquid alloy. The first controller receives the temperature data from the thermocouple and controls the heating load of the ceramic heating coil 600 according to the difference between the measured temperature and the preset temperature.

[0055] During use, the liquid alloy reaches a high temperature. In some embodiments, the high-temperature reactor 100 can be equipped with heat-insulating and anti-scalding components to save energy and protect operators, for example... Figure 4 As shown, insulation cotton 110 is provided outside the high-temperature vessel 100 to reduce heat loss. Note that when the heating component of the heating and temperature control mechanism (such as the ceramic heating ring 600) is located outside the high-temperature vessel 100, the high-temperature vessel 100 and the heating component can be wrapped together, and insulation cotton 110 should not be filled between the high-temperature vessel 100 and the heating component to avoid affecting heat transfer. A support shell 120 is provided outside the insulation cotton 110. The support shell 120 fits tightly against the insulation cotton 110, thereby constraining and fixing the insulation cotton 110. In addition, in some embodiments, the support shell 120 is square, and its four peripheral side walls are respectively provided with triangular ribs for fixed connection with the base to improve the stability of the equipment during operation.

[0056] In this invention, the lower clamp 210 bears the horizontal thrust of the drive shaft 310 and the vertical force applied by the loading rod 330. The latter can easily cause the free end of the drive shaft 310 to bend downwards. Therefore, support needs to be provided for the bottom of the lower clamp 210. In some embodiments, the bottom of the lower clamp 210 can be directly placed against the bottom of the high-temperature vessel 100. In other embodiments, to reduce wear on the bottom of the high-temperature vessel 100, a fixing seat 230 is fixed to the bottom of the high-temperature vessel 100. The fixing seat 230 is provided with a first linear guide rail extending axially along the drive shaft 310. The bottom of the lower clamp 210 is provided with a groove that mates with the first linear guide rail. Figure 6 As shown, the lower clamp 210 is located on the fixed base 230, and the first linear guide rail is embedded in the slide groove. Therefore, the fixed base 230 can support the lower clamp 210 and guide the lower clamp 210 to move linearly, thereby avoiding the free end of the drive shaft 310 from swinging.

[0057] In this invention, the drive shaft 310 is slidably and sealed to the side wall of the high-temperature reactor 100. The specific sealing method can be selected as needed. In some other embodiments, the drive shaft 310 is slidably and sealed to the side wall of the high-temperature reactor 100 via a sealing mechanism 800. The sealing mechanism 800 includes a first bushing 810, a sealing bellows 820, an electric heating wire 830, a thermocouple 840, and a heat insulation material 850. The first bushing 810 is horizontally arranged, with one end passing through and sealingly connected to the side wall of the high-temperature reactor 100. The drive shaft 310 is sleeved on the first bushing 810. The bellows 820 is fixed to the end of the first bushing 810 away from the high-temperature vessel 100, with one end sealed to the first bushing 810 and the other end sealed to the drive shaft 310, thereby preventing liquid metal leakage. The electric heating wire 830 is used to heat the liquid metal located between the drive shaft 310 and the first bushing 810 to prevent it from solidifying. The thermocouple 840 is used to measure the temperature of the liquid metal between the drive shaft 310 and the first bushing 810, thereby facilitating the adjustment of the load on the electric heating wire 830. The specific positions of the thermocouple 840 and the electric heating wire 830 can be set as needed. For example, in some embodiments, the electric heating wire 830 is set on the outer wall of the first bushing 810, and the thermocouple 840 is set on the first bushing 810 to provide feedback on the surface temperature of the first bushing 810. The heat insulation material 850 (such as aerogel) is wrapped around the electric heating wire 830 and fixed by the protective shell 860 for heat insulation and to prevent heat loss. When this invention is used, the temperature inside the high-temperature reactor 100 is relatively high, such as 400℃ or 500℃. High temperatures can easily damage sealing components, such as the sealing bellows 820. Therefore, when using this invention, the temperature inside the first bushing 810 can be controlled at 200℃. This can prevent the liquid lead bismuth inside from solidifying and hindering the movement of the drive rod, and can also reduce the temperature of the sealing bellows 820, thus protecting the equipment.

[0058] In this invention, the first power device 400 is used to provide power for the linear reciprocating movement of the drive shaft 310. Various existing power devices can meet this requirement, such as voice coil motors. However, it should be noted that the drive shaft 310 is in constant contact with high-temperature liquid alloy during the experiment, which results in its own high temperature and may easily cause the first power device 400 to be damaged by heat. Therefore, in some embodiments, a heat sink 870 or a heat insulation sheet is provided between the first power device 400 and the drive shaft 310 to prevent heat from being transferred to the first power device 400.

[0059] In use, the two abrasive samples 201 are arranged in a cross shape. When the lower clamp 210 moves, it can drive the abrasive sample 201 fixed thereon to move on the outer wall of the abrasive sample 201 fixed by the upper clamp 220. However, if the stroke of the lower clamp 210 is too large, causing the two abrasive samples 201 to separate from each other, the abrasive sample 201 fixed by the upper clamp 220 will move downward, thereby hindering the lower clamp 210 from continuing to move back and forth, which means that the experiment cannot continue. Therefore, it is necessary to control the stroke of the lower clamp 210. In some embodiments, a position sensor 880 (grating ruler) and a second controller are set. The position sensor 880 is used to collect the position information of a certain part of the drive shaft 310, thereby obtaining the stroke of the drive shaft 310. The second controller receives the position information of the drive shaft 310 and analyzes it to obtain the stroke of the drive shaft 310. Then, the load of the first power device 400 is adjusted according to the difference between the actual stroke and the preset stroke.

[0060] In this invention, the loading rod 330 is used to provide vertical pressure (also known as normal force) to the abrasive sample 201. The friction drive shaft 320 uses its own slight axial movement to measure the friction force between the two abrasive samples 201. In order to reduce the influence of the loading rod 330 on the axial movement of the friction drive shaft 320, in some examples, a roller or ball is provided at one end of the loading rod 330 located inside the high-temperature reactor 100.

[0061] In this invention, the axial compression mechanism 700 is used to apply an axial force to the loading rod 330. To accurately measure this axial force, in some instances, such as... Figure 7 As shown, the axial compression mechanism 700 includes a linear ball bearing guide and a weight 730. The linear ball bearing guide includes a second linear guide 710 and an L-shaped slider 720. The L-shaped slider 720 contacts the second linear guide 710 via balls and moves along the second linear guide 710. The friction between the two is small. The second linear guide 710 is vertically arranged and fixed on the upper end face of the high-temperature reactor 100. Therefore, the L-shaped slider 720 can move freely in the vertical direction. The upper end of the loading rod 330 is fixed on the L-shaped slider 720, and the lower end passes through the upper end face of the high-temperature reactor 100 and is clearance-fitted with it. The weight 730 (counterweight block) is placed on the L-shaped slider 720. Thus, the force applied to the loading rod 330 can be adjusted by adjusting the weight 730 on the L-shaped slider 720. During the experiment, multiple weights 730 can be used to facilitate load adjustment.

[0062] In this invention, the friction force measuring mechanism is used to measure the axial force on the friction force transmission shaft 320. During use, the friction force transmission shaft 320 is positioned above the liquid level, eliminating the risk of liquid metal leakage. Therefore, the friction force transmission shaft 320 can be slidably connected to the side wall of the high-temperature reactor 100 to reduce the frictional force during its movement. In some examples, such as... Figures 2-4As shown, the friction force measuring mechanism includes a second bushing 510, a steel ball sleeve 520, a piezoelectric force sensor 530, a fixed rod 540, and a cooling water jacket 550. The second bushing 510 is horizontally arranged, with one end passing through and sealingly connected to the side wall of the high-temperature reactor 100. The friction force transmission shaft 320 is sleeved inside the second bushing 510. The steel ball sleeve 520 is located between the second bushing 510 and the friction force transmission shaft 320, thereby reducing the resistance to the movement of the friction force transmission shaft 320. The fixed rod 540 is coaxially arranged with the friction force transmission shaft 320 and spaced at a certain distance. The fixed rod 540 is fixed in position. The piezoelectric force sensor 530 is located between the fixed rod 540 and the friction force transmission shaft 320 and abuts against both, thereby enabling the measurement of the friction force transmitted by the friction force transmission shaft 320. In addition, to prevent the friction force transmission shaft 320 from rotating, the cross-sections of the friction force transmission shaft 320, the steel ball sleeve 520, and the second bushing 510 can be made non-circular, such as regular quadrilaterals.

[0063] In this invention, both abrasive samples 201 are tubular or arc-shaped, and their contact area is small (approximately point contact). When the test temperature changes, the outer diameter of the abrasive sample 201 changes with the temperature. Since the hinge shaft 321 is hinged to the friction force transmission shaft 320, the free end of the upper clamp 220 will rotate around the hinge point, thereby causing the abrasive sample 201 it holds to rotate. This results in a change in the abrasion area of ​​the abrasive sample 201 held by the upper clamp 220, making it impossible to accurately measure the effect of temperature as a single variable on friction. Therefore, in some instances, such as... Figure 9 As shown, a parallelogram structure 900 is constructed by hinged four rods end-to-end. The parallelogram structure 900, hinge shaft 321, and friction drive shaft 320 are located in the same plane. The end of hinge shaft 321 facing away from friction drive shaft 320 is parallel to and fixedly connected to one side of parallelogram structure 900. The bottom edge of parallelogram structure 900 is fixedly connected to upper clamp 220. Thus, when hinge shaft 321 rotates, the top and bottom edges of parallelogram structure 900 remain horizontal, ensuring that when the outer diameter of abrasive sample 201 changes, the abrasive sample 201 held by upper clamp 220 moves vertically without changing the wear area. In specific implementation, the lower end of loading rod 330 directly abuts against the top edge (horizontal edge) of parallelogram structure 900.

[0064] In addition, in some embodiments, an oxygen sensor and a gas channel are provided on the vessel lid 101 for real-time feedback and control of the oxygen content in the liquid metal environment inside the vessel. The gas channel can be connected to three gases: high-purity argon, argon-oxygen mixture, and argon-hydrogen mixture, to control the oxygen content of the liquid metal inside the vessel. In some embodiments, the vessel lid 101 is also equipped with a hydraulic lifting mechanism and a guide mechanism for raising and lowering the vessel lid 101.

[0065] The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for simulating tangential fretting wear under high-temperature metal liquid environment, characterized in that, The utility model relates to a high temperature kettle, heating temperature control mechanism for controlling the temperature in the high temperature kettle, lower clamp and upper clamp in the high temperature kettle, two clamps clamp an abrasion sample respectively, and after clamping, two abrasion samples abut; Horizontally arranged drive shaft, one end of which is fixedly connected with the lower clamp, and the other end penetrates through the side wall of the high temperature kettle and is in sliding sealing connection with the side wall; First power equipment for pushing the drive shaft to move linearly in the horizontal plane reciprocatingly; Friction force transmission shaft parallel to the drive shaft, one end of which is located in the gas phase of the high temperature kettle, and the other end penetrates through the side wall of the high temperature kettle and is in sliding connection with the side wall; Hinged shaft located in the high temperature kettle, one end of which is hinged to the friction force transmission shaft through a rotating shaft, and the other end is connected with the upper clamp; Friction force measuring mechanism for measuring the axial force borne by the friction force transmission shaft; Vertically arranged loading rod capable of moving freely in the axial direction, the center line of which penetrates through the abutment area of the two abrasion samples; Shaft pressing mechanism for applying axial force to the loading rod; Wherein, the drive shaft, the hinged shaft and the loading rod are located in the same vertical plane, and the upper clamp is located above the lower clamp; Further comprising a parallelogram structure formed by four rods hinged in sequence, the parallelogram structure, the hinged shaft and the friction force transmission shaft are located in the same plane, one end of the hinged shaft away from the friction force transmission shaft is fixedly connected with one side of the parallelogram structure in parallel, the bottom edge of the parallelogram structure is fixedly connected with the upper clamp, and the lower end of the loading rod is opposite to the top edge of the parallelogram structure. The drive shaft is in sliding sealing connection with the side wall of the high temperature kettle through a sealing mechanism, and the sealing mechanism comprises: Horizontally arranged first shaft sleeve, one end of which penetrates through the side wall of the high temperature kettle and is in sealing connection with the side wall, and the drive shaft is located in the first shaft sleeve and is in clearance fit with the first shaft sleeve; Sealing bellows located at the end of the first shaft sleeve away from the high temperature kettle, one end of which is in sealing connection with the first shaft sleeve, and the other end is in sealing connection with the drive shaft; 2. The tangential fretting wear testing device under simulated high-temperature molten metal liquid environment according to claim 1, characterized in that, Electric heating wire for heating the liquid metal between the drive shaft and the first shaft sleeve; Thermocouple for measuring the temperature of the liquid metal between the drive shaft and the first shaft sleeve. The friction force measuring mechanism comprises: Horizontally arranged second shaft sleeve, one end of which is located in the gas phase of the high temperature kettle, and the other end penetrates through the side wall of the high temperature kettle and is in sealing connection with the side wall; the friction force transmission shaft is arranged in the second shaft sleeve; Steel ball sleeve located between the second shaft sleeve and the friction force transmission shaft; 3. The tangential fretting wear testing device under simulated high-temperature molten metal liquid environment according to claim 1, characterized in that, Cooling water jacket located on the outer wall of the second shaft sleeve; Fixed rod coaxially arranged with the friction force transmission shaft, the fixed rod is fixed in position; Piezoelectric force sensor located between the fixed rod and the friction force transmission shaft and abutting against the fixed rod and the friction force transmission shaft. The shaft pressing mechanism comprises: Weight; Linear ball guide rail, comprising:

4. The tangential fretting wear testing device under simulated high-temperature molten metal liquid environment according to claim 1, characterized in that, Vertically arranged second linear guide rail fixedly arranged on the upper end surface of the high temperature kettle; L-shaped slider in sliding connection with the second linear guide rail through balls, the upper end of the loading rod is fixedly connected with the L-shaped slider, and the lower end penetrates through the upper end surface of the high temperature kettle and is in clearance fit with the upper end surface; ​ ​ ​ The L-shaped slider is provided with a L-shaped groove, and the weight is placed in the L-shaped groove in a detachable manner.

5. The tangential fretting wear testing device under simulated high-temperature molten metal liquid environment according to claim 1, characterized in that, Further comprising: A position sensor is arranged to collect position information of a part of the driving shaft; A second controller is arranged to receive information of the position sensor and analyze the stroke of the driving shaft, and then adjust the load of the first power device according to the difference between the actual stroke and the preset stroke.

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