High-temperature shaft sleeve friction wear test device

Abstract

The invention provides a high-temperature shaft sleeve friction wear test device. The high-temperature shaft sleeve friction wear test device can comprise a heating furnace, a rotary execution mechanism and a radial force loading mechanism. The heating furnace is used for providing a closed high-temperature cavity and comprises a first sample opening located in the horizontal direction and a second sample opening located in the top face. In the rotary executing mechanism, a first sample clamp extends into the heating furnace through a first sample opening in a cantilever mode. In the radial force loading mechanism, a linear bearing is fixedly connected to the top of the heating furnace, an adjusting piece nut is fixedly connected to the top of the linear bearing, an adjusting piece is cylindrical and is in threaded connection with the adjusting piece nut, a compensation spring is arranged at the top of the adjusting piece, a weight disc is arranged at the top of the compensation spring, and the weight disc is pressed on a loading shaft. And the compression degree of the compensation spring can be adjusted by rotating the adjusting sheet.

Description

Technical Field

[0001] The present invention belongs to the technical field of friction and wear testing equipment, and is used for testing the friction and wear performance of a pin-bushing kinematic pair and its coating at high temperature (for example, up to 1100° C.), and specifically relates to a high-temperature bushing friction and wear testing device. Background Art

[0002] There are a large number of pin-bushing kinematic pairs inside aircraft engines. The operating temperature of these kinematic pairs ranges from room temperature to a maximum of 1100°C, and severe wear may occur under the action of thermal-mechanical coupling. The friction and wear behavior of kinematic pairs under different temperature conditions shows different laws. Especially under high temperature conditions, the structural materials used in aircraft engines oxidize, and the friction and wear mechanism of the kinematic pair interface also changes accordingly. Therefore, it is necessary to conduct experimental research on the friction and wear performance of these kinematic pairs under high temperature conditions.

[0003] The pin-bushing belongs to the rotating pair of line contact. At present, the standard testing machine generally adopts the ring-block friction and wear testing machine. For example, the Chinese patent application with the publication number CN108344654A discloses a ring-block friction and wear testing machine, which realizes the stepless adjustment of the loading force by adjusting the spring compression amount, and can realize the ring-block friction and wear test under different lubrication conditions and different temperature conditions. However, the curvature radius of the block sample in the ring-block contact is infinite, and its contact stress distribution is quite different from that of the pin-bushing contact, which cannot well simulate the friction and wear of the sleeve in the actual working condition.

[0004] Reference 1 reports on the experimental study of the friction and wear performance of aviation metal fluoroplastic bushings. The experimental device uses a bushing to connect the mandrel to the support seat, applies a radial load to the mandrel through a loading plate, and drives the mandrel to rotate back and forth through a swing cylinder to achieve friction and wear between the bushing and the mandrel. Although this device simulates the actual working conditions of friction and wear between the shaft and the bushing, it cannot measure the actual value of the friction force and can only be used to evaluate the wear of the bushing after multiple cycles.

[0005] The Chinese patent application with publication number CN118641198A discloses a multi-condition friction and wear test simulation device suitable for rotating pairs. The test device is mainly composed of a rigid frame, a rotary drive actuator, a bending moment loading actuator, a heating actuator, and a radial positive pressure loading actuator. By driving the pin shaft test piece at the end of the rotary actuator to rotate, the pin shaft test piece and the sleeve test piece are mutually worn under the conditions of radial positive pressure, bending moment and heating, thereby meeting the test needs of multi-condition friction and wear. Although the device realizes heating and temperature detection of the test piece through a heating rod, an outer baffle, a mounting plate and a temperature measuring thermocouple attached to the outer surface of the bushing test piece, the semi-open heating mechanism will cause uneven temperature distribution of the test piece, and when the test temperature is high, the temperature of the area where the bending moment loading actuator on one side is located will also increase significantly. Limited by the working temperature of precision components such as motors and sensors, the maximum temperature that the device can heat is limited.

[0006] The Chinese patent with the announcement number CN117589622B discloses a high-temperature vacuum ring-shaft friction and wear test system. The test system constrains the position of the sample by arranging a ring sleeve outside the assembled sleeve sample. When the shaft sample rotates, the friction between the ring shaft drives the ring sleeve to rotate, which is transmitted by the baffle to the static torque sensor for collection and measurement. However, in the process of the friction force measured by the system being transmitted from the ring shaft contact surface to the static torque sensor, it is also affected by the friction between the ring sleeve and the plane bearing, and the friction between the ring sleeve and the sliding bearing curved surface loading block, resulting in certain measurement errors. Generally speaking, the operating temperature of bearings is limited. It can be seen that the reported operating temperature of high-temperature resistant bearings made of special materials can reach about 300°C. The plane bearings and sliding bearings of the test system are arranged in a heating furnace, which reduces the reliability and operating temperature of the device.

[0007] At present, there are problems in the high-temperature friction and wear test device for the pin-bushing kinematic pair, such as the large difference between the specimen shape and the actual situation, insufficient maximum test temperature, large friction force measurement error, and insufficient device reliability.

[0008] Reference 1: Lin Jing, Zhao Yingchun. Experimental study on friction and wear properties of aviation metal fluoroplastic bushings[J]. Aviation Standardization and Quality, 2019, (05): 23-26. DOI: 10.13237 / j.cnki.asq.2019.05.005. Summary of the invention

[0009] In order to solve or alleviate at least one of the problems mentioned in the background technology, the present application provides a high-temperature shaft sleeve friction and wear testing device.

[0010] The high temperature sleeve friction and wear test device provided in the embodiment of the present application comprises:

[0011] A heating furnace, used to provide a closed high-temperature cavity, the heating furnace comprising a first sample opening located in the horizontal direction and a second sample opening located on the top surface;

[0012] A rotary actuator, comprising a first rotating shaft, a torque sensor, a second rotating shaft and a first sample fixture connected in sequence, wherein the first rotating shaft is configured to provide a rotating power, and the first sample fixture extends into the heating furnace through the first sample opening in the form of a cantilever;

[0013] A radial force loading mechanism comprises a linear bearing, an adjusting piece nut, an adjusting piece, a compensation spring, a loading shaft, a weight plate and a second sample fixture, wherein the linear bearing is fixedly connected to the top of the heating furnace, the adjusting piece nut is fixedly connected to the top of the linear bearing, the adjusting piece is formed into a cylindrical shape and is threadedly connected to the adjusting piece nut, the compensation spring is arranged on the top of the adjusting piece, the weight plate is arranged on the top of the compensation spring, and the weight plate is pressed onto the loading shaft so that the compression degree of the compensation spring can be adjusted by rotating the adjusting piece, one end of the loading shaft extends into the heating furnace through the linear bearing and the first sample opening, and one end of the loading shaft is also connected to the second sample fixture.

[0014] In at least one embodiment, a heat insulation sheet is installed outside the first sample opening, the heat insulation sheet includes a heat insulation sheet opening connected to the first sample opening, and the second rotating shaft extends into the heating furnace through the heat insulation sheet opening.

[0015] In at least one embodiment, the rotary actuator includes a transition shaft having a diameter smaller than a diameter of the second rotating shaft, one end of the transition shaft is connected to the second rotating shaft, and the other end of the transition shaft is connected to the first sample holder.

[0016] In at least one embodiment, a cooling water coil is disposed outside the second rotating shaft.

[0017] In at least one embodiment, the rotary actuator includes a motor, a reducer and a coupling, the motor is connected to the first rotating shaft through the reducer and the coupling, and the coupling is a diaphragm coupling.

[0018] In at least one embodiment, the second sample fixture includes a curved surface, the second sample for testing has a curved surface, the curved surface of the second sample is used to fit the curved surface of the second sample fixture, and the second sample fixture is provided with a second fixture threaded hole, and the second sample can be fixed to the second sample fixture through a fastener and the threaded hole.

[0019] In at least one embodiment, the second sample fixture includes a plane adjacent to the arc surface in the circumferential direction. When the second sample has a plane, the plane of the second sample is used to fit the plane of the second sample fixture.

[0020] In at least one embodiment, a cylindrical recess or protrusion is provided at one end of the loading shaft, and a cylindrical protrusion or recess is provided at one end of the second sample fixture, and the loading shaft and the second sample fixture can be plug-fitted.

[0021] In at least one embodiment, the radial force loading mechanism also includes a weight column and a weight, the weight column is connected to the loading shaft, the axes of the weight disk, the loading shaft and the weight column coincide, the center of the weight has a hole that cooperates with the weight column, and the weight is installed on the weight disk through the weight column.

[0022] In at least one embodiment, the high temperature bushing friction and wear testing device further comprises a horizontal displacement mechanism, which is configured to drive the rotary actuator to horizontally displace and enable the first sample fixture to enter and exit the heating furnace from the first sample opening.

[0023] The present application directly sets the torque sensor between the first rotating shaft and the second rotating shaft. The torque transmission path between the torque sensor and the sample is short, the friction loss is small, and the reliability is higher. The rotary actuator extends the first sample fixture into the heating furnace in the form of a cantilever. This cantilever form is convenient for cooperation with the radial force loading mechanism, so that the loading direction of the radial force loading mechanism can be perpendicular to the rotation direction of the cantilever, that is, the radial force loading mechanism can successfully load the radial force. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 An axonometric view of a high-temperature bushing friction and wear device according to an embodiment of the present application is shown.

[0025] Figure 2 A cross-sectional view of a high-temperature shaft sleeve friction and wear device according to an embodiment of the present application is shown.

[0026] Figure 3 Shows Figure 2 A partial enlarged view of the location of the sample.

[0027] Figure 4 Shows Figure 2 A local enlarged view of the location of the radial force loading mechanism.

[0028] Figure 5 An isometric view of a second sample fixture of a high-temperature bushing friction and wear device according to an embodiment of the present application is shown.

[0029] Description of Reference Numerals

[0030] 100 Heating furnace

[0031] 110 First sample opening

[0032] 120 Second sample opening

[0033] 130 Heat Insulation Sheet

[0034] 140 Heating furnace upper plate

[0035] 150 Furnace

[0036] 160 Furnace door

[0037] 170 Thermocouple

[0038] 200 Rotary Actuator

[0039] 201 First Rotation Axis

[0040] 202 Torque sensor

[0041] 203 Second Rotating Axis

[0042] 204 First specimen fixture

[0043] 210 Transition shaft

[0044] 220 Cooling water coil

[0045] 231 Motor

[0046] 232 Reducer

[0047] 233 Coupling

[0048] 234 Motor bracket

[0049] 241 Bearing

[0050] 242 Bearing spacer

[0051] 300 Radial force loading mechanism

[0052] 301 Linear Bearings

[0053] 302 Adjustment plate nut

[0054] 303 Adjustment sheet

[0055] 304 Compensation Spring

[0056] 305 Loading shaft

[0057] 3051 Depression

[0058] 306 Weight Plate

[0059] 307 Second sample fixture

[0060] 3071 Camber

[0061] 3072 Second clamp threaded hole

[0062] 3073 Plane

[0063] 3074 Protrusion

[0064] 310 Weight column

[0065] 320 Weights

[0066] 400 Horizontal displacement mechanism

[0067] 401 Workbench

[0068] 402 Rigid Bracket

[0069] 403 bracket upper plate

[0070] 404 Linear Guides

[0071] 405 Slider

[0072] 406 Slide

[0073] 407 Support Column

[0074] 408 Support Plate

[0075] 510 First Sample

[0076] 520 Second Sample DETAILED DESCRIPTION

[0077] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0078] The present application provides a high temperature sleeve friction and wear test device (hereinafter sometimes referred to as "test device"). It should be understood that the test device can be applied to high temperatures (eg, about 1100°C) or any temperature condition from room temperature to high temperature.

[0079] "Axle sleeve" should be understood as a shaft and a sleeve, that is, the first sample used for the test can be a pin, and the second sample can be a bushing. Of course, the first sample and the second sample can also be various parts that meet the characteristics of the shaft and sleeve.

[0080] See also Figure 1The sample device may include a heating furnace 100 , a horizontal displacement mechanism 400 , a rotation actuator 200 and a radial force loading mechanism 300 .

[0081] Heating furnace 100

[0082] See also Figure 2 The heating furnace 100 is used to provide a closed high-temperature cavity. The heating furnace 100 may include a furnace body 150 , a furnace door 160 , a heat insulation sheet 130 , a heating furnace upper plate 140 and a thermocouple 170 .

[0083] A furnace door 160 may be provided on one side of the furnace body 150 in the horizontal direction, and the furnace door 160 is hinged to the furnace body 150. Self-locking buckles may be provided at the four corners of the furnace door 160 to facilitate locking of the furnace door 160 to the furnace body 150. The furnace door 160 may be provided with a first sample opening 110 for the first sample 510 to extend into the heating furnace 100.

[0084] A second sample opening 120 may be provided on the top surface of the furnace body 150 for the second sample 520 to pass through.

[0085] According to the test requirements, the temperature in the furnace may be high, and the heat may diffuse outward through the first sample opening 110. Threaded holes may be set around the first sample opening 110 for fixing the heat insulation sheet 130. The heat insulation sheet 130 includes a heat insulation sheet opening connected to the first sample opening 110, and the second rotating shaft 203 extends into the heating furnace 100 through the heat insulation sheet opening. The material of the heat insulation sheet 130 may be alumina ceramic or biotite, etc., which has a good heat insulation effect.

[0086] The heating furnace 100 further includes a heating furnace upper plate 140 , the linear bearing 301 is fixed to the heating furnace upper plate 140 , and the heating furnace upper plate 140 is disposed on the top of the heating furnace 100 .

[0087] Thermocouple 170 may extend from the side wall opposite to furnace door 160 into heating furnace 100 for monitoring the temperature inside the furnace.

[0088] Horizontal displacement mechanism 400

[0089] See also Figure 1 , Figure 2 The horizontal displacement mechanism 400 may include a workbench 401, a rigid support 402, a support upper plate 403, a linear guide rail 404, a slider 405, a slide 406, a support column 407 and a support plate 408.

[0090] The upper surface of the workbench 401 is provided with threaded holes, which can be used to fix the rigid bracket 402. The rigid bracket 402 is provided with threaded holes, which can be used to fix the bracket upper plate 403, so that the linear guide 404 has a certain height to match the position of the heating furnace 100. The bracket upper plate 403 is provided with threaded holes, which can be used to fix the linear guide 404. The slider 405 has built-in balls and can move horizontally on the linear guide 404. The slider 405 is connected to the fixed slide 406, the support column 407, and the support plate 408 by threaded connection. The support plate 408 is provided with threaded holes, which can be used to fix the rotary actuator 200. The support column 407 enables the rotary actuator 200 to have a certain height to match the position of the first sample opening 110.

[0091] Rotary Actuator 200

[0092] See also Figures 1 to 3 The rotary actuator 200 may include a motor 231 , a reducer 232 , a coupling 233 , a motor bracket 234 , a first rotating shaft 201 , a torque sensor 202 , a second rotating shaft 203 , a cooling water coil 220 , a transition shaft 210 , a first sample fixture 204 , a bearing 241 and a bearing pad 242 .

[0093] The motor 231 may be a servo motor, the reducer 232 may be a planetary reducer, and the coupling 233 may be a diaphragm coupling. The motor 231 and the reducer 232 may be connected to a motor bracket 234, and the motor bracket 234 may be connected to the support plate 408. The output shaft of the reducer 232 is connected to the first rotating shaft 201 through the coupling 233.

[0094] The first rotating shaft 201 can be fixed to the torque sensor 202 through a threaded flange, and the torque sensor 202 is fixed to the second rotating shaft 203 through a threaded flange. The second rotating shaft 203 passes through a bearing 241 (for example, a seated outer spherical bearing), and the bearing 241 can be threadedly connected to the support plate 408 through a bearing pad 242. The cooling water coil 220 can be arranged outside the first rotating shaft 201 to cool the shaft by supplying cooling water.

[0095] The end of the second rotating shaft 203 ( Figure 2 The first sample holder 204 has a threaded hole at the right end thereof, which can be mechanically matched with the transition shaft 210. One end of the first sample holder 204 is mounted on the transition shaft 210, and the other end is mounted with the first sample 510. The first sample 510 and the first sample holder 204 can be locked by screws.

[0096] It should be understood that the present application directly sets the torque sensor 202 between the first rotating shaft 201 and the second rotating shaft 203, and the torque transmission path between the torque sensor 202 and the sample is short, the friction loss is small, and the reliability is higher.

[0097] The rotary actuator 200 extends the first sample fixture 204 into the heating furnace 100 in the form of a cantilever. This cantilever structure facilitates cooperation with the subsequent radial force loading mechanism 300 loaded by weights, so that the loading direction of the radial force loading mechanism 300 can be perpendicular to the rotation direction of the cantilever, that is, the radial force loading mechanism 300 can successfully load the radial force.

[0098] Considering the rigidity of the cantilever, the second rotating shaft 203 is relatively thick, and in order to be connected to the smaller first sample fixture 204, a transition shaft 210 having a diameter smaller than the second rotating shaft 203 is provided. Compared with directly providing a thinner second rotating shaft 203, the present application provides a thicker second rotating shaft 203 and then provides a transition shaft 210, which can not only fix the smaller first sample fixture 204, but also take into account the rigidity of the system.

[0099] Furthermore, a plurality of first sample fixtures 204 with various clamping apertures may be prepared to meet the clamping requirements of first samples 510 with different outer diameters. For special first samples 510, the required clamping aperture may be machined in a fixture replacement without a hole to meet special needs.

[0100] The temperature in the furnace may be relatively high according to the test requirements. The first sample fixture 204 and its locking screws may be made of high temperature alloy or high temperature resistant stainless steel, which can maintain sufficient mechanical properties at high temperatures.

[0101] Radial force loading mechanism 300

[0102] See also Figure 4 The radial force loading mechanism 300 may include a linear bearing 301, an adjusting plate nut 302, an adjusting plate 303, a compensation spring 304, a loading shaft 305, a weight plate 306, and a second sample fixture 307 (see Figure 3 ) and weight column 310.

[0103] The linear bearing 301 is fixedly connected to the top of the heating furnace 100, for example, fixed to the upper plate 140 of the heating furnace, the adjusting piece nut 302 is fixedly connected to the top of the linear bearing 301, the adjusting piece 303 is formed into a cylindrical shape and is threadedly connected to the adjusting piece nut 302, the compensation spring 304 is arranged on the top of the adjusting piece 303, the weight plate 306 is arranged on the top of the compensation spring 304, and the weight plate 306 is pressed on the loading shaft 305. By rotating the adjusting piece 303, the axial distance between the adjusting piece 303 and the adjusting piece nut 302 can be adjusted, and then the compression degree of the compensation spring 304 can be adjusted.

[0104] It should be understood that the weight plate 306 is supported by the compensation spring 304 in addition to the support force of the loading shaft 305. The support force of the compensation spring 304 on the weight plate 306 can be adjusted by adjusting the compression degree of the compensation spring 304, thereby offsetting the influence of the self-weight of the radial force loading mechanism 300.

[0105] See also Figure 2 , the weight column 310 can be arranged at the axis of the weight disk 306, and the weight column 310 can be threadedly connected to the loading shaft 305. The corresponding load can be applied to the second sample 520 by arranging a weight 320 of corresponding weight in the weight disk 306. The weight 320 can be a commercially available Newton weight with a hole, and its hole can be matched with the weight column 310. The axes of the weight disk 306, the loading shaft 305 and the weight column 310 can overlap. The weight 320 can be installed on the weight disk 306 through the weight column 310.

[0106] One end (lower end) of the loading shaft 305 extends into the heating furnace 100 through the linear bearing 301 and the first sample opening 110. One end of the loading shaft 305 is also connected to the second sample fixture 307. Figure 5 The second sample fixture 307 may include a curved surface 3071, and the second sample 520 may have a curved surface. The curved surface of the second sample 520 is used to fit the curved surface 3071 of the second sample fixture 307, and the loading force can be transmitted to the second sample 520 through the curved surface 3071. The second sample fixture 307 is provided with a second fixture threaded hole 3072, and the second sample fixture 307 and the second sample 520 can be fixed by a fastener, such as a locking screw.

[0107] Furthermore, the second sample holder 307 may include a plane 3073 adjacent to the arc surface 3071 in the circumferential direction of the arc surface 3071. When the second sample 520 has a plane (for example, the cylindrical second sample 520 is trimmed), the plane of the second sample 520 is fitted to the plane 3073 to prevent rotation.

[0108] Furthermore, a plurality of second sample fixtures 307 with various camber radii may be prepared to meet the clamping requirements of second samples 520 with different outer diameters. For second samples 520 with special outer diameters, the required camber radius may be machined in the fixture replacement.

[0109] See also Figure 3, the loading shaft 305 may be provided with a cylindrical recessed portion 3051, and the second sample fixture 307 may be provided with a cylindrical protruding portion 3074, so that the loading shaft 305 and the second sample fixture 307 can be plugged and matched. Of course, a cylindrical protruding portion may also be provided on the loading shaft 305, and a cylindrical recessed portion may be provided on the second sample fixture 307. In this way, the second sample fixture 307 can rotate along its axis to fine-tune the coaxiality between the first sample 510 and the second sample 520. Of course, a set screw may also be provided to achieve the fixation between the loading shaft 305 and the second sample fixture 307.

[0110] According to the test requirements, the temperature in the furnace may be relatively high, and the second sample fixture 307 and its locking screws may be made of high-temperature alloy, high-temperature resistant stainless steel or alumina ceramics, which can maintain sufficient mechanical properties at high temperatures.

[0111] In one embodiment, the working process of the test device provided by the present application is as follows.

[0112] Before the test begins, use a level to calibrate the support plate 408 and the upper plate 140 of the heating furnace, fine-tune the circumferential position of the second sample fixture 307, ensure that the coaxiality of the first sample 510 and the second sample 520 is within the specified standard, and record the height of the loading shaft 305 at this time; rotate the adjustment plate 303 to adjust the compression amount of the compensation spring 304 so that the second sample 520 is suspended at the corresponding height. At this time, the supporting force provided by the compensation spring 304 just offsets the deadweight of the radial force loading device; close the furnace door 160, and move the slide 406 to make the first sample 510 and the second sample 520 cooperate with each other.

[0113] The heating furnace 100 is programmed to raise the temperature in the chamber to the target temperature and keep it warm; a specific weight combination is added to the weight plate 306 to achieve radial force loading on the outer surface of the second sample 520; the first sample 510 is controlled by the motor 231 to reciprocate at a specific speed and angle; the friction torque between the first sample 510 and the second sample 520 is transmitted by the long rotating shaft to the torque sensor 202 for collection and measurement, and can be output and displayed on the computer.

[0114] The friction coefficient of the first sample 510 and the second sample 520 can be obtained by converting the weight, friction torque and sample radius, that is, the friction force F of the contact surface is obtained by multiplying the friction torque M by the radius r of the first sample 510, and then the friction coefficient μ is obtained by dividing the friction force F by the weight G. The torque sensor (202) can also convert the friction torque M on the shaft into an electrical signal, and display it on a computer through the acquisition instrument output.

[0115] The test device provided in the present application can effectively simulate the friction and wear behavior of the pin-bushing kinematic pair under high temperature and radial load conditions, solving the problem of limited maximum test temperature of existing devices.

[0116] In addition, the size and fit tolerance of the first sample 510 and the second sample 520 can be determined according to the actual parts to be evaluated, which can better simulate the actual situation. The mechanical properties and temperature resistance of the materials used in the device have been verified and can meet the test requirements within 1100°C. The maximum test temperature is higher than that of existing devices. The torque sensor 202 is directly installed on the rotating shaft to directly measure the torque. The load transfer path is short and the test error is smaller. The layout position of components such as bearings and electrical components is far away from the heating furnace 100, and the rotating shaft is cooled by the cooling water coil 220, so the performance is more stable and reliable. The device uses weights to apply radial loads, which is more reliable and simpler than traditional force feedback electronic control loading.

[0117] It should be understood that fixed connection includes fixing one part to another part by means of fasteners, which does not limit whether the two parts are detachable.

[0118] The above is a preferred embodiment of the present application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A high temperature sleeve friction and wear test device, characterized in that: include: A heating furnace (100) is used to provide a closed high-temperature cavity, wherein the heating furnace (100) comprises a first sample opening (110) located in a horizontal direction and a second sample opening (120) located on a top surface; A rotary actuator (200), comprising a first rotating shaft (201), a torque sensor (202), a second rotating shaft (203) and a first sample holder (204) connected in sequence, wherein the first rotating shaft (201) is configured to provide a rotary power, and the first sample holder (204) extends into the heating furnace (100) through the first sample opening (110) in the form of a cantilever; A radial force loading mechanism (300) comprises a linear bearing (301), an adjusting piece nut (302), an adjusting piece (303), a compensation spring (304), a loading shaft (305), a weight plate (306) and a second sample fixture (307), wherein the linear bearing (301) is fixedly connected to the top of the heating furnace (100), the adjusting piece nut (302) is fixedly connected to the top of the linear bearing (301), the adjusting piece (303) is formed into a cylindrical shape and is threadedly connected to the adjusting piece nut (302), and the compensation spring (304) is connected to the adjusting piece nut (302). 4) is arranged on the top of the adjusting plate (303), the weight plate (306) is arranged on the top of the compensation spring (304), and the weight plate (306) is pressed on the loading shaft (305), so that the compression degree of the compensation spring (304) can be adjusted by rotating the adjusting plate (303), one end of the loading shaft (305) extends into the heating furnace (100) through the linear bearing (301) and the first sample opening (110), and one end of the loading shaft (305) is also connected to the second sample fixture (307).

2. The high temperature sleeve friction and wear testing device according to claim 1, characterized in that: A heat insulation sheet (130) is installed outside the first sample opening (110), and the heat insulation sheet (130) includes a heat insulation sheet opening connected to the first sample opening (110), and the second rotating shaft (203) extends into the heating furnace (100) through the heat insulation sheet opening.

3. The high temperature sleeve friction and wear testing device according to claim 1, characterized in that: The rotary actuator (200) comprises a transition shaft (210), the diameter of the transition shaft (210) is smaller than the diameter of the second rotating shaft (203), one end of the transition shaft (210) is connected to the second rotating shaft (203), and the other end is connected to the first sample fixture (204).

4. The high temperature sleeve friction and wear testing device according to claim 1, characterized in that: A cooling water coil (220) is disposed outside the second rotating shaft (203).

5. The high temperature sleeve friction and wear testing device according to claim 1, characterized in that: The rotary actuator (200) comprises a motor (231), a reducer (232) and a coupling (233); the motor (231) is connected to the first rotating shaft (201) via the reducer (232) and the coupling (233); and the coupling (233) is a diaphragm coupling.

6. The high temperature sleeve friction and wear testing device according to claim 1, characterized in that: The second sample fixture (307) includes a curved surface (3071), and the second sample (520) used for the test has a curved surface. The curved surface of the second sample (520) is used to fit the curved surface (3071) of the second sample fixture (307). The second sample fixture (307) is provided with a second fixture threaded hole (3072), and the second sample (520) can be fixed to the second sample fixture (307) through a fastener and the second fixture threaded hole (3072).

7. The high temperature sleeve friction and wear testing device according to claim 6, characterized in that: The second sample fixture (307) includes a plane (3073) adjacent to the arc surface (3071) in the circumferential direction. When the second sample (520) has a plane, the plane of the second sample (520) is used to fit the plane (3073) of the second sample fixture (307).

8. The high temperature sleeve friction and wear testing device according to claim 1, characterized in that: One end of the loading shaft (305) is provided with a cylindrical recessed portion (3051) or a protruding portion, and one end of the second sample fixture (307) is provided with a cylindrical protruding portion (3074) or a recessed portion. The loading shaft (305) and the second sample fixture (307) can be plugged and matched.

9. The high temperature sleeve friction and wear testing device according to claim 1, characterized in that: The radial force loading mechanism (300) further comprises a weight column (310) and a weight (320), wherein the weight column (310) is connected to the loading shaft (305), the axes of the weight disk (306), the loading shaft (305) and the weight column (310) coincide with each other, the center of the weight (320) comprises a hole matching with the weight column (310), and the weight (320) is mounted on the weight disk (306) through the weight column (310).

10. The high temperature sleeve friction and wear testing device according to claim 1, characterized in that: The high-temperature shaft sleeve friction and wear testing device further comprises a horizontal displacement mechanism (400), wherein the horizontal displacement mechanism (400) is configured to drive the rotary actuator (200) to horizontally displace and enable the first sample fixture (204) to enter and exit the heating furnace (100) from the first sample opening (110).

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