Friction experiment device in thermal vacuum environment

Abstract

The invention relates to the technical field of wear resistance experiments, and discloses a friction experiment device in a thermal vacuum environment, which comprises an experiment platform, a vacuum test box arranged on the experiment platform, auxiliary support side plates arranged on two sides of the vacuum test box, a pressure applying mechanism and a rotating mechanism, the pressure applying mechanism comprises a supporting sleeve arranged on the auxiliary supporting side plate on one side, a first pull rod connected with the auxiliary supporting side plate in a sliding mode is arranged in the supporting sleeve, a constant-tension pressure applying assembly for driving the first pull rod to move in the direction away from the center of the experiment platform is arranged on the auxiliary supporting side plate, and an extending plate is arranged on the outer side of the supporting sleeve; one end, close to the center of the experiment platform, of the extension plate is rotatably connected with the middle of an L-shaped deflection plate; and one end, close to the experiment platform, of the L-shaped deflection plate is provided with a friction block. The constant-tension pressure applying assembly is arranged to continuously pull the first pull rod to move, so that the friction block always keeps pressing force to perform friction treatment along the outer wall of the friction ring.

Description

Technical Field

[0001] The invention relates to the technical field of wear resistance experiments, in particular to a friction experiment device in a thermal vacuum environment. Background Art

[0002] Friction experiment in thermal vacuum environment is an experiment to study the friction characteristics of objects under specific conditions, and to explore the friction coefficient, wear law and other characteristics of different materials in thermal vacuum environment. Therefore, it is necessary to provide a vacuum and specific high temperature environment for the experiment. The vacuum environment is usually composed of a vacuum pump and vacuum measuring instruments, which can reduce the air pressure of the experimental environment to the required vacuum degree, generally reaching Even lower to simulate the high vacuum state of space. The heating and temperature control system can heat and accurately control the temperature of the experimental samples, so that the experiment can be carried out under different temperature conditions to simulate the extreme temperature changes in the space environment. The heating method can be resistance heating, infrared heating, etc., and the temperature control accuracy is usually required to reach ±1℃ or even higher.

[0003] Some existing equipment usually applies loads by bolting. However, during the friction test, the material itself will be damaged due to continuous friction. At this time, the size of the material changes. The bolting method will cause the pressure on the friction surface to change, thereby affecting the friction force. Therefore, it needs to be improved. Summary of the invention

[0004] The purpose of the present invention is to provide a friction test device in a thermal vacuum environment to solve the technical problem of pressure change on the friction surface existing in the prior art.

[0005] A friction experiment device for a thermal vacuum environment comprises an experimental platform, a vacuum test box is arranged on the experimental platform, auxiliary support side plates are arranged on both sides of the vacuum test box, and also comprises a pressure mechanism and a rotating mechanism; the pressure mechanism comprises a support sleeve arranged on the auxiliary support side plate on one side, a first pull rod slidably connected to the auxiliary support side plate is arranged inside the support sleeve, a constant tension pressure assembly driving the first pull rod to move in a direction away from the center of the experimental platform is arranged on the auxiliary support side plate, an extension plate is arranged on the outer side of the support sleeve, one end of the extension plate close to the center of the experimental platform is rotatably connected to the middle part of an L-shaped deflection plate, a friction block is arranged on the end of the L-shaped deflection plate close to the experimental platform, a push plate is arranged at the end of the first pull rod, the end of the push plate is rotatably connected to one end of a connecting rod, and the other end of the connecting rod is rotatably connected to the end of the L-shaped deflection plate away from the center of the experimental platform; the rotating mechanism comprises a rotating sleeve rotatably connected to the auxiliary support side plate on the other side, an inner ring clamping head assembly is arranged on the side of the rotating sleeve close to the center of the experimental platform, and a friction ring cooperating with the friction block is detachably connected to the outer side of the inner ring clamping head assembly.

[0006] As a preferred technical solution of the present invention, the number of the protruding plates is greater than or equal to two, and the protruding plates are evenly distributed relative to the center of the support sleeve. The end of the L-shaped deflection plate close to the center of the experimental platform is rotatably connected to a fixed clamping plate, and the fixed clamping plate is detachably connected to a friction block.

[0007] As a preferred technical solution of the present invention, the constant tension pressure assembly includes a cross bar arranged on the side of the first pull rod away from the center of the experimental platform, the cross bar is connected to one end of the pulling rope, and the other end of the pulling rope is provided with a counterweight head. The end of the experimental platform is provided with a clearance groove matched with the counterweight head, and the internal size of the clearance groove is larger than the size of the counterweight head. Vertical plates are arranged on both sides of the clearance groove, and the ends of the vertical plates are provided with a main shaft, and the main shaft is rotatably connected with a guide wheel matched with the pulling rope. A limited slot plate is arranged at one end of the first pull rod away from the center of the experimental platform, and a deflection top plate is rotatably connected to the middle of the main shaft. An arc-shaped top head matched with the limited slot plate is arranged at the end of the deflection top plate. When the deflection top plate rotates to a state of contact with the arc-shaped top head, the L-shaped deflection plate is in an unfolded state relative to the support sleeve. A stopper rod matched with the pulling rope is arranged at one end of the deflection top plate away from the arc-shaped top head. When the pulling rope is in a tensioned state under the gravity of the counterweight head, the pulling rope is close to the outside of the stopper rod.

[0008] As a preferred technical solution of the present invention, the inner ring clamping head assembly includes a second pull rod slidably connected to the middle of the rotating sleeve, one end of the second pull rod close to the center of the experimental platform is rotatably connected to one end of the first support plate, the other end of the first support plate is rotatably connected to one side of the clamping block, the other side of the clamping block is rotatably connected to one end of the second support plate, and the other end of the second support plate is rotatably connected to the outside of the rotating sleeve. A support frame is provided at the end of the rotating sleeve away from the center of the experimental platform, the middle part of the support frame is threadedly connected to the middle part of the pulling screw rod, and the end of the pulling screw rod is rotatably connected to the end of the second pull rod. The number of the clamping blocks is greater than or equal to two, and the clamping blocks are evenly distributed relative to the center of the rotating sleeve. The clamping blocks are L-shaped structures, and a rubber pad is provided on the side of the clamping block that contacts the inner wall of the friction ring. A threaded sleeve is provided on the side of the rotating sleeve close to the center of the experimental platform, and a slide groove is provided on the outside of the threaded sleeve, and a slider is slidably connected to the slide groove, and the slider is rotatably connected to the end of the second support plate, and two fastening nuts threadedly connected to the threaded sleeve are provided on the side of the slider away from the center of the experimental platform.

[0009] As a preferred technical solution of the present invention, a driving motor is provided on the experimental platform, and the output shaft of the driving motor is fixedly connected to a first transmission pulley, the first transmission pulley is connected to a second transmission pulley through a conveyor belt, and the second transmission pulley is fixedly connected to a side of a rotating sleeve away from the center of the experimental platform.

[0010] By adopting the above technical solution, the present invention has the following beneficial effects: By setting a constant tension pressure component to continuously pull the first pull rod to move, the friction block always maintains the clamping force to perform friction along the outer wall of the friction ring, so that the friction ring and the friction block can still perform effective friction processing even if the thickness changes after long-term friction, thereby simulating the friction effect under actual use conditions, making the final experimental results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 This is a schematic diagram of the structure of a friction experiment device in a thermal vacuum environment.

[0013] Figure 2 This is a schematic diagram of the structure inside a vacuum test box in a friction test device in a thermal vacuum environment.

[0014] Figure 3 The figure is a schematic diagram of the structure of the friction block and the friction ring in a friction experiment device in a thermal vacuum environment.

[0015] Figure 4 for Figure 3 Front view of .

[0016] Figure 5 This is a schematic diagram of the structure of a pressure mechanism in a friction experiment device in a thermal vacuum environment.

[0017] Figure 6 for Figure 5 A is a partial enlarged schematic diagram of the middle part.

[0018] Figure 7 Schematic diagram of the structure of an L-shaped deflection plate in a friction experimental device in a thermal vacuum environment.

[0019] Figure 8 The schematic diagram is a structural diagram of a deflection top plate against a limit slot plate in a friction experiment device in a thermal vacuum environment.

[0020] Fig. 9 This is a schematic diagram of the structure of a rotating mechanism in a friction experimental device in a thermal vacuum environment.

[0021] Fig.10 for Fig. 9 Front view of .

[0022] Fig.11This is a schematic diagram of the structure of a rotating sleeve in a friction experiment device in a thermal vacuum environment.

[0023] Figure numerals.

[0024] In the figure: 1. Experimental platform; 2. Vacuum test chamber; 3. Pressure mechanism; 4. Rotation mechanism; 5. Auxiliary support side plate; 6. Support sleeve; 7. Extension plate; 8. L-shaped deflection plate; 9. Connecting rod; 10. Push plate; 11. First pull rod; 12. Constant tension pressure assembly; 13. Giving way groove; 14. Counterweight head; 15. Pull rope; 16. Vertical plate; 17. Guide wheel; 18. Main shaft; 19. Cross bar; 20. Stop rod; 21. Deflection top plate; 22. Arc-shaped top head; 23. Limiting card slot plate; 24. Fixed card plate; 25. Friction block; 26. Rotating sleeve; 27. Second pull rod; 28. First support plate; 29. ​​Clamping block; 30. Second support plate; 31. Pulling screw rod; 32. Support frame; 33. Inner ring clamping head assembly; 34. First transmission pulley; 35. Driving motor; 36. Conveyor belt; 37. Second transmission pulley; 38. Sliding block; 39. Fastening nut; 40. Slide groove; 41. Threaded sleeve; 42. Friction ring. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In one embodiment, see Figure 1-Figure 11 , a friction test device in a thermal vacuum environment, comprising an experimental platform 1, the experimental platform 1 is in a flat state for installing various experimental equipment, a supporting leg is arranged on the lower surface of the experimental platform 1, so that the experimental platform 1 maintains a reasonable height for the convenience of operators to use, a vacuum test box 2 is arranged in the middle of the upper surface of the experimental platform 1, and an openable cover is arranged on the top of the vacuum test box 2. When in use, the operator can lift the cover upwards to operate various instruments inside the vacuum test box 2. Various temperature control and vacuum control equipment are arranged inside the vacuum test box 2, and in order to improve the structural strength of the vacuum test box 2, auxiliary support side panels 5 are arranged on the side walls on the left and right sides of the vacuum test box 2. Subsequent accessories are installed through the auxiliary support side panels 5, which reduces the structural strength requirements of the side walls of the vacuum test box 2. The auxiliary support side panels 5 can provide sufficient supporting force, and also include a pressure mechanism 3 and a rotating mechanism 4; The pressure-applying mechanism 3 includes a support sleeve 6 arranged on the right side above the left auxiliary support side plate 5. The support sleeve 6 is a tubular structure and is arranged on the right side of the auxiliary support side plate 5 in a left-right direction. A first pull rod 11 arranged in a left-right direction is arranged inside the support sleeve 6. The middle part of the first pull rod 11 is slidably connected to the auxiliary support side plate 5. A constant tension pressure component 12 is arranged on the left side of the auxiliary support side plate 5 on the left. The constant tension pressure component 12 can continuously pull the first pull rod 11 to move to the left, and the pressure of the constant tension pressure component 12 on the first pull rod 11 is constant. The left end of the extension plate 7 is fixedly connected to the right end of the support sleeve 6. The right end of the extension plate 7 is inclined toward the direction away from the center of the support sleeve 6. The extension plate 7 is a U-shaped structure. , the right end of the extended plate 7 is rotatably connected to the middle part of the L-shaped deflection plate 8, a friction block 25 is arranged at the right end of the L-shaped deflection plate 8, and a push plate 10 fixedly connected to the first pull rod 11 is arranged at the right end of the first pull rod 11, the end of the push plate 10 is rotatably connected to the right end of the connecting rod 9, and the left end of the connecting rod 9 is rotatably connected to the left end of the L-shaped deflection plate 8, so when the first pull rod 11 moves to the right, the first pull rod 11 pulls the L-shaped deflection plate 8 to rotate in a direction away from the support sleeve 6 through the connecting rod 9, and the L-shaped deflection plate 8 is opened at this time, and when the first pull rod 11 moves to the left and is tightened, the first pull rod 11 pulls the L-shaped deflection plate 8 to rotate in a direction close to the support sleeve 6 through the connecting rod 9, and the L-shaped deflection plate 8 is retracted at this time, and the friction block 25 performs a pressure treatment; The rotating mechanism 4 includes a rotating sleeve 26 arranged on the upper end of the right auxiliary supporting side plate 5. The rotating sleeve 26 is connected to the upper end of the auxiliary supporting side plate 5 in a left-right rotating manner. An inner ring clamping head assembly 33 is arranged on the left end of the rotating sleeve 26. A friction ring 42 is sleeved on the outside of the inner ring clamping head assembly 33, so that the friction ring 42 is fixed by the inner ring clamping head assembly 33. The axial lines of the rotating sleeve 26 and the supporting sleeve 6 are collinearly arranged, so the circle formed by the friction ring 42 and the friction block 25 is collinearly arranged. At this time, when the L-shaped deflection plate 8 is folded, the friction block 25 will fall on the outside of the friction ring 42, and the inner ring of the friction block 25 is designed to be an arc-shaped structure, so that the friction block 25 is attached to the outer wall of the friction ring 42 to achieve a clamping effect.

[0027] In one case of the present embodiment, the number of the protruding plates 7 is greater than or equal to two, and three are provided in the present application. The three protruding plates 7 are evenly distributed relative to the center of the support sleeve 6, that is, three friction blocks 25 are also provided in the present application, and the right end of the L-shaped deflection plate 8 is rotatably connected to the fixed clamp plate 24, and the end of the fixed clamp plate 24 close to the center of the support sleeve 6 is detachably connected to the friction block 25. The rotational connection between the fixed clamp plate 24 and the L-shaped deflection plate 8 allows the friction block 25 to adaptively adjust its angle during operation, so that the friction block 25 can be stably pressed on the subsequent friction ring 42, and the detachable connection between the fixed clamp plate 24 and the friction block 25 allows the experimental device to replace different friction blocks 25 for experiments, and the friction block 25 can be disassembled and assembled after one test, and the friction block 25 after the experiment is completed can be subsequently tested.

[0028] In one case of this embodiment, the constant tension pressure component 12 includes a middle part of a cross bar 19 arranged on the left side of the first pull rod 11, and the cross bar 19 is arranged in a front-to-back direction. The upper end of the pulling rope 15 is connected to the front and rear ends of the cross bar 19, and the lower end of the pulling rope 15 is connected to the front and rear sides of the upper surface of the counterweight head 14, and a clearance groove 13 is arranged on the left side of the experimental platform 1. The size of the clearance groove 13 is larger than the outer size of the counterweight head 14, so that the counterweight head 14 can pass through the clearance groove 13 from top to bottom, so that the counterweight head 14 has enough descending space to facilitate pulling the first pull rod 11, and the clearance groove 13 is provided on the left side of the experimental platform 1. 3 is provided with a vertical plate 16 on both the front and rear sides, and the vertical plate 16 is vertically fixed on the upper surface of the experimental platform 1. The upper end of the vertical plate 16 is provided with a main shaft 18 arranged in a front-to-back direction, and guide wheels 17 are provided on the front and rear sides of the main shaft 18. The guide wheel 17 can support the pulling rope 15, so that the pulling rope 15 can be vertically extended downward. A vertically arranged limit card slot plate 23 is provided at the left end of the first pull rod 11, and the left side of the limit card slot plate 23 is an arc surface mechanism, and a limit groove is provided at the center position of the left side surface of the limit card slot plate 23. The middle part of the main shaft 18 is rotatably connected to the middle part of the deflection top plate 21, and the deflection The rotating top plate 21 rotates clockwise or counterclockwise along the main shaft 18, and an arc-shaped top head 22 is set at the right end of the deflection top plate 21. Therefore, when the deflection top plate 21 rotates clockwise to a horizontal state, the arc-shaped top head 22 will press against the limiting groove of the limiting slot plate 23. At this time, the angle of the deflection top plate 21 is locked, and the first pull rod 11 is pushed to the right. At this time, the first pull rod 11 pulls the L-shaped deflection plate 8 to rotate through the connecting rod 9, so that the L-shaped deflection plate 8 is in an open state. At this time, the spacing of the friction blocks 25 is in the largest state, which is convenient for the operator to clamp the friction ring 42. A baffle 20 facing forward and backward is provided at the left end. When the deflection top plate 21 rotates counterclockwise, the arc-shaped top head 22 disengages from the limiting slot plate 23, placing the counterweight head 14 in the giving way slot 13. The gravity of the counterweight head 14 tightens the pulling rope 15. At this time, the pulling rope 15 is in a taut state. At this time, the pulling rope 15 will be close to the baffle 20, so that the deflection top plate 21 rotates counterclockwise to a state facing the upper right. At this time, the entire device can work normally, and the deflection top plate 21 will not fall and contact the limiting slot plate 23, thereby preventing the deflection top plate 21 from affecting the movement of the first pull rod 11 toward the left.

[0029] In one case of the present embodiment, the inner ring clamping head assembly 33 includes a second pull rod 27 slidably connected to the middle part of the rotating sleeve 26, the left end of the second pull rod 27 is rotatably connected to the left end of the first support plate 28, the right end of the second support plate 30 is rotatably connected to the left side of the clamping block 29, the right side of the clamping block 29 is rotatably connected to the left end of the second support plate 30, the right end of the second support plate 30 is rotatably connected to the outside of the rotating sleeve 26, the left and right sides of the side of the clamping block 29 close to the second pull rod 27 are rotatably connected to the ends of the first support plate 28 and the second support plate 30 respectively, a support frame 32 is provided at the right end of the rotating sleeve 26, the support frame 32 is a U-shaped structure with an opening to the left, the middle part of the right end of the support frame 32 is threadedly connected to the middle part of the pulling wire rod 31 arranged in the left and right directions, the left end of the pulling wire rod 31 is rotatably connected to the right end of the second pull rod 27, so when the pulling wire rod 31 is rotated, the pulling wire rod 31 The second pull rod 27 can be pulled to move left and right along the rotating sleeve 26. When the second pull rod 27 moves to the right, the first support plate 28 and the second support plate 30 will push the clamping block 29 outward, so that the clamping block 29 can be pressed against the inner side of the friction ring 42 to fix the friction ring 42. The number of the clamping blocks 29 is greater than or equal to two. In the present application, three clamping blocks 29 can be set. The three clamping blocks 29 are evenly distributed relative to the center of the rotating sleeve 26. The three clamping blocks 29 can be pressed against the inner wall of the friction ring 42 more stably, and the clamping block 29 is an L-shaped structure, that is, a rib is set at the right end of the clamping block 29, so that after the friction ring 42 is fixed to the outside of the clamping block 29, the friction ring 42 will not fall from the right end of the clamping block 29, thereby improving the stability of the clamping block 29 clamping the friction ring 42, and a rubber pad is set on the side where the clamping block 29 contacts the inner wall of the friction ring 42. That is to say, the rubber pad is arranged on the side of the clamping block 29 away from the center of the rotating sleeve 26. On the one hand, the rubber pad can increase the friction between the clamping block 29 and the friction block 25. On the other hand, the buffering effect of the rubber pad can prevent the clamping block 29 from clamping the inner wall of the friction ring 42.

[0030] In one case of the present embodiment, a threaded sleeve 41 is sleeved on the left side of the rotating sleeve 26, and a slide groove 40 is arranged on the outer side of the threaded sleeve 41. The slide groove 40 is distributed in a left-right direction relative to the central circumference of the rotating sleeve 26, and a slider 38 is slidably connected to the middle part of the slide groove 40. The left end of the slider 38 is rotatably connected to the right end of the second support plate 30, and two fastening nuts 39 are threadedly connected to the right side of the threaded sleeve 41. By setting two fastening nuts 39 to press against each other, loosening of the fastening nuts 39 themselves can be avoided, and the fastening nuts 39 can limit the position of the slider 38, so that the slider 38 can only move to the right to a state of being pressed against the fastening nuts 39, thereby cooperating with the second pull rod 27 that moves left and right to adjust the left and right position of the friction ring 42, so that the friction block 25 can be close to the target position of the friction ring 42 for friction processing. A driving motor 35 is provided at the right end of the upper surface of the experimental platform 1, and the output shaft of the driving motor 35 is fixedly connected to a first transmission pulley 34, the first transmission pulley 34 is connected to a second transmission pulley 37 through a transmission belt 36, and the second transmission pulley 37 is fixedly connected to a side of the rotating sleeve 26 away from the center of the experimental platform 1. The driving motor 35 realizes the rotation of the rotating sleeve 26 through the transmission belt 36, and finally realizes the rotation of the friction ring 42.

[0031] During the implementation of this embodiment, the end cover on the top of the vacuum test box 2 is opened, the friction block 25 is installed on the fixed clamping plate 24, and the position of the fastening nut 39 is adjusted according to the size of the friction ring 42 to be tested. After the adjustment is completed, the pulling screw 31 is rotated, and the pulling screw 31 drives the second pull rod 27 to move to the right. The second pull rod 27 pushes the clamping block 29 outward through the first support plate 28 and the second support plate 30. The clamping block 29 is pressed against the inner wall of the friction ring 42. At this time, the friction ring 42 completes the clamping process. According to the friction pressure, a counterweight head 14 of appropriate weight is selected, and the deflection top plate 21 is rotated counterclockwise, and the arc-shaped top head 22 is disengaged from the limit slot plate 23. Open, at this time, place the counterweight head 14 in the middle of the clearance groove 13, and adjust the pulling rope 15 to fall on the guide wheel 17, slowly move the counterweight head 14 downward, the pulling rope 15 is tightened by the counterweight head 14, and the pulling rope 15 drives the first pull rod 11 to move to the left. At this time, the first pull rod 11 pulls the L-shaped deflection plate 8 toward the direction of the friction ring 42 through the connecting rod 9, and the friction block 25 is pressed tightly against the outside of the friction ring 42. Release the counterweight head 14, close the cover of the vacuum test box 2, start the vacuum test box 2, and judge whether the experimental environment inside the vacuum test box 2 meets the experimental requirements through various sensors, and start the entire friction experiment after standing for a period of time according to the experimental standards. Experiments in thermal vacuum environments involve dangerous factors such as high temperature and high vacuum. Experimenters must strictly abide by operating procedures and wear protective equipment to prevent accidents such as burns, electric shocks and vacuum leaks. Therefore, it is necessary to adjust the temperature and air pressure after the end cover of the vacuum test box 2 is sealed, so that the operator can be separated from the high temperature and high pressure environment. Equipment such as vacuum systems and heating systems are relatively complex and require regular maintenance and upkeep to ensure the performance and stability of the equipment. During the experiment, pay close attention to the operating status of the equipment and promptly handle any faults and problems that arise. There may be a variety of factors that cause errors during the experiment, such as vacuum fluctuations, uneven temperature, sample installation errors, etc. Effective measures need to be taken to control and calibrate to improve the accuracy and reliability of experimental data. Temperature control and pressure control are routine equipment maintenance, so I will not go into detail on how to operate them.

[0032] The friction block 25 and the friction ring 42 need to be made of suitable materials according to the experimental requirements, and surface treatment such as polishing and cleaning is performed to ensure the flatness and cleanliness of the sample surface, and then the sample is installed in the friction experiment device. The vacuum test box 2 starts the vacuum system, heating and temperature control system and friction experiment device, debugs the parameters of each system to achieve the vacuum degree, temperature and motion parameters required for the experiment, and performs calibration and testing to ensure the normal operation of the equipment.

[0033] The driving motor 35 is started, and the driving motor 35 rotates the rotating sleeve 26 through the conveyor belt 36. The rotating sleeve 26 drives the friction ring 42 to start high-speed self-rotation, and the friction ring 42 and the friction block 25 are relatively displaced. The high-speed camera set inside the vacuum test chamber 2 continuously captures the change of the friction position. As the friction ring 42 and the friction block 25 are continuously rubbed, the thickness of the friction ring 42 and the friction block 25 continuously changes. At this time, the first pull rod 11 continuously moves to the left, and the friction block 25 always maintains a state of being pressed against the friction ring 42, and the friction effect is always maintained. During the experiment, the friction block 25 and the friction ring 42 are subjected to different normal loads through the pressure mechanism 3 under the set thermal vacuum environment. The rotating mechanism causes the friction ring 42 to move relative to each other at a certain speed and stroke, and the measurement system records the changes of parameters such as the friction coefficient and friction force in real time. At the same time, the monitoring equipment is used to observe and record the phenomena and wear conditions during the friction process. After the experiment, the collected data were sorted and analyzed, and the curves of the change of friction coefficient with time, load, temperature and other parameters were drawn. Combined with the images and analysis results obtained by the monitoring equipment, the friction and wear characteristics and mechanisms of the material in the thermal vacuum environment were studied.

[0034] When the friction test is completed, stop driving the motor 35, wait until the temperature and air pressure inside the vacuum test chamber 2 return to normal, open the cover on the top of the vacuum test chamber 2, first lift the counterweight head 14 and place it on the left end of the upper surface of the experimental platform 1, rotate the deflection top plate 21 clockwise, and the arc-shaped top head 22 is pressed tightly against the middle of the limit slot plate 23. At this time, the friction block 25 is disengaged from the friction ring 42, and the pulling screw 31 is rotated in the opposite direction. The pulling screw 31 pushes the second pull rod 27 to the left, and the clamping block 29 is released from the friction ring 42. The friction ring 42 is taken out, and the friction block 25 is removed from the fixed card plate 24. Subsequently, the friction ring 42 and the friction block 25 are further inspected and processed.

[0035] The present invention is applicable to a friction test device in a thermal vacuum environment. By setting a constant tension pressure component 12 to continuously pull the first pull rod 11 to move, the friction block 25 always maintains the pressing force to perform friction along the outer wall of the friction ring 42, so that the friction ring 42 and the friction block 25 can still perform effective friction processing even if the thickness changes after long-term friction, thereby simulating the friction effect under actual use conditions, making the final experimental results more accurate. In addition, compared with the traditional method of fixing the friction block 25 by bolting, on the one hand, the thickness of the friction block 25 decreases as the experiment progresses, and the bolt connection cannot push the friction block 25 to move in time, thereby reducing the pressure on the friction surface and reducing the friction force. On the other hand, since the vacuum test chamber 2 needs to conduct experiments in a high temperature and vacuum environment, the high temperature may affect the fixing effect of the bolts. That is to say, even if there is sufficient pressure between the friction block 25 and the friction ring 42 to achieve friction during the clamping stage, as the temperature rises, the bolts will deform. At this time, the pressure between the friction block 25 and the friction ring 42 will change, thereby affecting the entire friction experiment. However, in the present application, the constant tension pressure component 12 on the left and the pulling screw 31 on the right are both arranged outside the vacuum test chamber, that is to say, high temperature does not affect the normal operation of these pressure providing components, thereby ensuring the pressure stability during the experiment.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

Claims

1. A friction test device in a thermal vacuum environment, comprising an experimental platform, a vacuum test box is arranged on the experimental platform, and auxiliary supporting side plates are arranged on both sides of the vacuum test box, characterized in that: It also includes a pressure mechanism and a rotation mechanism; A pressure mechanism, comprising a support sleeve arranged on an auxiliary support side plate on one side, a first pull rod slidably connected to the auxiliary support side plate is arranged inside the support sleeve, a constant tension pressure assembly driving the first pull rod to move in a direction away from the center of the experimental platform is arranged on the auxiliary support side plate, an extension plate is arranged on the outer side of the support sleeve, one end of the extension plate close to the center of the experimental platform is rotatably connected to the middle part of the L-shaped deflection plate, a friction block is arranged on the end of the L-shaped deflection plate close to the experimental platform, a push plate is arranged at the end of the first pull rod, the end of the push plate is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the end of the L-shaped deflection plate away from the center of the experimental platform; The rotating mechanism includes a rotating sleeve rotatably connected to the auxiliary supporting side plate on the other side. An inner ring clamping head assembly is arranged on the side of the rotating sleeve close to the center of the experimental platform. A friction ring cooperating with the friction block is detachably connected to the outside of the inner ring clamping head assembly.

2. A friction test device in a thermal vacuum environment according to claim 1, characterized in that: The number of the protruding plates is greater than or equal to two, and the protruding plates are evenly distributed relative to the center of the support sleeve. The end of the L-shaped deflection plate close to the center of the experimental platform is rotatably connected to a fixed clamping plate, and a friction block is detachably connected to the fixed clamping plate.

3. The friction test device in a thermal vacuum environment according to claim 1, characterized in that: The constant tension pressure assembly includes a cross bar arranged on the side of the first pull rod away from the center of the experimental platform, the cross bar is connected to one end of the pulling rope, and a counterweight head is arranged at the other end of the pulling rope. A clearance groove cooperating with the counterweight head is arranged at the end of the experimental platform, and the internal size of the clearance groove is larger than the size of the counterweight head. Vertical plates are arranged on both sides of the clearance groove, and a main shaft is arranged at the end of the vertical plate, and a guide wheel cooperating with the pulling rope is rotatably connected to the main shaft.

4. A friction test device in a thermal vacuum environment according to claim 3, characterized in that: A limiting slot plate is provided at one end of the first pull rod away from the center of the experimental platform, the middle part of the main shaft is rotatably connected to a deflection top plate, and the end of the deflection top plate is provided with an arc-shaped top head that cooperates with the limiting slot plate. When the deflection top plate rotates to a state of contact with the arc-shaped top head, the L-shaped deflection plate is in an unfolded state relative to the support sleeve.

5. The friction test device in a thermal vacuum environment according to claim 4, characterized in that: A stop rod cooperating with a pulling rope is arranged at one end of the deflection top plate away from the arc-shaped top head. When the pulling rope is in a tensioned state due to the gravity of the counterweight head, the pulling rope is closely attached to the outside of the stop rod.

6. The friction test device in a thermal vacuum environment according to claim 1, characterized in that: The inner ring clamping head assembly includes a second pull rod slidably connected to the middle part of the rotating sleeve, one end of the second pull rod close to the center of the experimental platform is rotatably connected to one end of the first support plate, the other end of the first support plate is rotatably connected to one side of the clamping block, the other side of the clamping block is rotatably connected to one end of the second support plate, and the other end of the second support plate is rotatably connected to the outside of the rotating sleeve.

7. The friction test device in a thermal vacuum environment according to claim 6, characterized in that: A support frame is arranged at one end of the rotating sleeve away from the center of the experimental platform, the middle part of the support frame is threadedly connected to the middle part of the pulling wire rod, and the end of the pulling wire rod is rotatably connected to the end of the second pulling rod.

8. The friction test device in a thermal vacuum environment according to claim 7, characterized in that: The number of the clamping blocks is greater than or equal to two, the clamping blocks are evenly distributed relative to the center of the rotating sleeve, the clamping blocks are L-shaped structures, and a rubber pad is arranged on the side of the clamping block that contacts the inner wall of the friction ring.

9. The friction test device in a thermal vacuum environment according to claim 8, characterized in that: A threaded sleeve is provided on the side of the rotating sleeve close to the center of the experimental platform, a sliding groove is provided on the outside of the threaded sleeve, the sliding groove is slidably connected to a slider, the slider is rotatably connected to the end of the second support plate, and two fastening nuts threadedly connected to the threaded sleeve are provided on the side of the slider away from the center of the experimental platform.

10. The friction test device in a thermal vacuum environment according to claim 1, characterized in that: The experimental platform is provided with a driving motor, the output shaft of the driving motor is fixedly connected to a first transmission pulley, the first transmission pulley is connected to a second transmission pulley via a conveyor belt, and the second transmission pulley is fixedly connected to a side of a rotating sleeve away from the center of the experimental platform.

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