High-frequency high-precision fretting friction wear testing device

Abstract

The invention discloses a high-frequency and high-precision fretting friction wear testing device which comprises a workbench, a reciprocating motion loading assembly, a fixing plate, a force measuring assembly, a vertical force loading assembly and a displacement measuring and recording assembly. The reciprocating motion loading assembly outputs reciprocating motion in the first horizontal direction to the sample rod, so that mutual friction motion occurs between the movable sample and the fixed sample. The force measuring assembly can obtain friction force between the movable sample and the fixed sample, and the displacement measuring and recording assembly can obtain relative displacement of the movable sample and the fixed sample in the first horizontal direction. By adopting the high-frequency and high-precision fretting friction wear testing device, various wear resistance experiments can be realized, and the accuracy of the wear resistance experiments can be improved, such as wear resistance experiments of materials under different vertical loading forces, wear resistance experiments of movable samples and fixed samples made of the same material, and wear resistance experiments of the fixed samples and the movable samples made of the same material. And carrying out abrasion resistance test on the movable test sample and the fixed test sample made of different materials.

Description

Technical Field

[0001] The present application relates to the technical field of testing equipment, and in particular to a high-frequency and high-precision micro-motion friction and wear testing device. Background Art

[0002] The phenomenon of micro-motion friction and wear of materials is common in mechanical equipment, especially in aerospace equipment. The friction and wear performance of key moving parts will seriously affect the performance of the equipment. For example, the turbine blades and turbine disks in aircraft engines are connected by mortise and tenon joints. When the engine is working, the reciprocating gravity and centrifugal force will cause micro-motion friction and wear under cyclic load between the bottom end of the turbine blades and the turbine disk, which will have a great impact on the life and use status of the engine, and will bring certain safety hazards to the use of aerospace vehicles.

[0003] In most cases, it is not possible to directly measure the fretting friction and wear state of related components. Fretting friction and wear testing equipment is usually used to test the fretting friction and wear properties of related materials.

[0004] However, in the related technology, the existing testing device can only preload on the fixed sample mechanism, and cannot accurately apply the preload force at the contact position. It is inevitable that interference factors such as torque will be generated due to the fact that the force position of the moving sample is not at the center of the fixed sample, which reduces the accuracy of the material wear resistance test. At the same time, it is difficult for the experimental device to accurately measure the relevant parameter properties of the material micro-friction wear at high frequency. Summary of the invention

[0005] The embodiment of the present application provides a high-frequency and high-precision micro-motion friction and wear testing device, which can solve the technical problem that the wear resistance of materials cannot be accurately measured in the prior art. The technical solution is as follows:

[0006] A high-frequency and high-precision micro-motion friction and wear testing device comprises: a workbench; a reciprocating motion loading assembly fixedly connected to the workbench, the reciprocating motion loading assembly having an output portion, the output portion being connected to a sample rod extending along a first horizontal direction, the free end of the sample rod having a vertical first through hole, the first through hole being used to install a moving sample; a fixed plate, the fixed plate being connected to the workbench, the fixed plate being connected to a fixed sample holder through a force measuring assembly, the fixed sample holder being located below the first through hole, the top of the fixed sample holder being used to install a fixed sample; a vertical force loading assembly fixedly connected to the upper surface of the workbench, for applying a vertical loading force to the moving sample; and a displacement measurement and recording assembly fixedly connected to the workbench, the displacement measurement assembly being used to record the relative displacement between the moving sample and the fixed sample along the first horizontal direction.

[0007] Optionally, the fixed sample holder is in a herringbone shape, having two mutually perpendicular legs, the two legs being arranged front and back along the first horizontal direction, and each leg having an angle of 45 degrees with the vertical direction; the force measuring assembly comprises a sensor holder and a dynamic force sensor fixedly connected to the sensor holder; wherein the lower end of each leg contacts a force-bearing part of the dynamic force sensor, and the sensor holder is fixedly connected to the fixed plate.

[0008] Optionally, the fixed sample holder is cylindrical; the force measuring assembly includes a sensor holder and a dynamic force sensor fixedly connected to the sensor holder; along the first horizontal direction, the front, rear and bottom of the fixed sample holder are respectively in contact with the force-bearing part of the dynamic force sensor, and the dynamic force sensor is connected to the fixed plate through the force sensor holder.

[0009] Optionally, the reciprocating motion loading assembly includes: a support frame, the support frame includes a column, an upper beam arranged at the top end of the column and extending along the first horizontal direction, and a lower beam arranged at the bottom end of the column and extending along the first horizontal direction, and the upper beam and the lower beam are equal in length; a piezoelectric actuator, horizontally mounted on the column, having an active end extending along the first horizontal direction; an elastic sheet, the two ends of the elastic sheet are respectively connected to the end of the upper beam and the end of the lower beam; wherein the active end of the piezoelectric actuator abuts against a side of the elastic sheet close to the column, and the side of the elastic sheet away from the column is connected to the sample rod.

[0010] Optionally, it also includes a horizontal adjustment seat, which includes a base plate, a lateral adjustment slide platform and a longitudinal adjustment slide platform arranged in sequence from bottom to top; wherein the base plate is fixedly connected to the workbench, and the fixed plate is fixedly connected to the longitudinal adjustment slide platform.

[0011] Optionally, the vertical force loading assembly includes: a loading rod arranged perpendicular to the sample rod, the middle part of the loading rod having a downwardly protruding push rod, the lower end of the push rod being a conical head, and the top of the movable sample having a conical pit matching the conical head; two first guide wheels, the two first guide wheels are fixedly connected to the fixed plate and are respectively located below the two ends of the loading rod; a second guide wheel, fixedly connected to the edge of the workbench; a third guide wheel, fixedly connected to the workbench between the second guide wheel and the two first guide wheels; and a first traction rope and two second traction ropes, one end of the first traction rope is connected to a weight, and the other end passes through the top of the first guide wheel and the bottom of the third guide wheel in turn and is connected to one end of the two second traction ropes, and the other ends of the two second traction ropes pass through the bottom of the first guide wheel respectively and are connected to the ends of the loading rod.

[0012] Optionally, the displacement measurement and recording assembly includes: a reflector arranged at the top of the fixed sample holder, the reflector is located in front of the fixed sample along the first horizontal direction, and the reflective surface of the reflector is a vertical surface; and a laser vibrometer located on one side of the fixed sample holder; wherein the reflector, the laser vibrometer and the movable sample are in the same horizontal plane, and the angle between the reflective surface and the first horizontal direction is 45 degrees, and the angle between the reflective surface and the laser vibrometer is 45 degrees.

[0013] Optionally, the first through hole is a rectangular hole, the movable sample includes an upper rectangular parallelepiped section and a lower semi-cylindrical section, and a central axis of the semi-cylindrical section is perpendicular to the first horizontal direction.

[0014] Optionally, in the vertical direction, the thickness of the middle portion of the sample rod is smaller than the thickness at both ends.

[0015] Optionally, the end of the sample rod has a spherical abutment head, and the elastic sheet has a spherical recess matching the abutment head on a side facing the sample rod.

[0016] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0017] A high-frequency and high-precision micro-motion friction and wear testing device comprises: a workbench, a reciprocating motion loading component, a fixed plate, a vertical force loading component and a displacement measurement and recording component. The sample rod fixes the moving sample, the lower end of the moving sample contacts the upper surface of the fixed sample, and a vertical loading force toward the fixed sample is applied to the moving sample through the vertical force loading component. The reciprocating motion loading component outputs a reciprocating motion along the first horizontal direction to the sample rod, so that the moving sample and the fixed sample have a mutual friction motion. The force measuring component can obtain the friction force between the moving sample and the fixed sample, the displacement measurement and recording component can obtain the relative displacement of the moving sample and the fixed sample along the first horizontal direction, and the vertical loading force applied by the vertical force loading component can be measured. By using the high-frequency and high-precision micro-motion friction and wear testing device of the present application, a variety of friction resistance performance experiments can be realized and the accuracy of wear resistance experiments can be improved, such as: friction resistance performance experiments of materials under different vertical loading forces, friction resistance performance experiments of moving samples and fixed samples of the same material, and friction resistance performance experiments of moving samples and fixed samples of different materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a stereoscopic diagram of a high-frequency and high-precision micro-motion friction and wear testing device provided in an embodiment of the present application from one perspective;

[0020] Figure 2 is a stereogram of the high-frequency and high-precision micro-motion friction and wear testing device provided in an embodiment of the present application from another perspective;

[0021] Figure 3 It is a schematic diagram of the installation of a mobile sample and a fixed sample provided in an embodiment of the present application;

[0022] Figure 4 is a three-dimensional schematic diagram of a fixed sample holder provided in an embodiment of the present application;

[0023] Figure 5 It is a three-dimensional schematic diagram of a fixed sample holder, a sample rod and a horizontal adjustment seat provided in an embodiment of the present application;

[0024] Figure 6 yes Figure 1 and Figure 2 Front view of the reciprocating loading assembly;

[0025] Figure 7 is a three-dimensional schematic diagram of a vertical force loading assembly provided in an embodiment of the present application;

[0026] Figure 8 is a three-dimensional schematic diagram of a loading rod provided in an embodiment of the present application;

[0027] Fig. 9 is a three-dimensional schematic diagram of a displacement measurement and recording assembly provided in an embodiment of the present application;

[0028] Fig.10 is a three-dimensional schematic diagram of a sample rod provided in an embodiment of the present application;

[0029] Fig.11 It is a three-dimensional schematic diagram of the elastic sheet provided in the embodiment of the present application.

[0030] Description of Reference Numerals

[0031] 1-working table; 2-reciprocating motion loading assembly; 201-support frame; 2011-column; 2012-upper beam; 2013-lower beam; 202-piezoelectric actuator; 203-elastic sheet; 2031-spherical pit; 3-sample rod; 301-first through hole; 4-force measuring assembly; 401-sensor bracket; 402-dynamic force sensor; 5-fixed sample bracket; 501-leg; 6-vertical force loading assembly; 601-loading rod; 6011-top rod; 602-first guide wheel; 603-second guide wheel; 604-third guide wheel; 605-first traction rope; 606-second traction rope; 607-weight; 7-displacement measurement and recording component; 701-reflector; 702-laser vibrometer; 8-moving sample; 801-rectangular section; 802-semi-cylindrical section; 9-horizontal adjustment seat; 901-bottom plate; 902-lateral adjustment sliding table; 903-longitudinal adjustment sliding table; 10-fixed plate; 11-fixed sample. DETAILED DESCRIPTION

[0032] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0033] In the present disclosure, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the "upper" and "lower" of the corresponding parts in the use state relative to the direction of gravity, and "inside" and "outside" refer to the "inside" and "outside" relative to the corresponding parts' own contours. In addition, the terms "first", "second", etc. used in the present disclosure are to distinguish one element from another and do not have order and importance. In the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements.

[0034] The phenomenon of micro-motion friction and wear of materials is common in mechanical equipment, especially in aerospace equipment. The friction and wear performance of key moving parts will seriously affect the performance of the equipment. For example, the turbine blades and turbine disks in aircraft engines are connected by mortise and tenon joints. When the engine is working, the reciprocating gravity and centrifugal force will cause micro-motion friction and wear under cyclic load between the bottom end of the turbine blades and the turbine disk, which will have a great impact on the life and use status of the engine, and will bring certain safety hazards to the use of aerospace vehicles.

[0035] In most cases, it is not possible to directly measure the micro-friction and wear state of related components. However, in the related technology, the existing testing device can only preload on the fixed sample mechanism and cannot accurately apply the preload force at the contact position. It is inevitable that interference factors such as torque will be generated due to the fact that the force position of the moving sample is not in the center of the fixed sample, which reduces the accuracy of the experiment. At the same time, it is difficult for the experimental device to accurately measure the relevant parameter properties of the material micro-friction and wear at high frequency.

[0036] According to the embodiments of the present application, reference Figure 1 and Figure 2 A high-frequency and high-precision micro-motion friction and wear testing device includes: a workbench 1, a reciprocating motion loading component 2, a fixed plate 10, a force measuring component 4, a vertical force loading component 6 and a displacement measurement and recording component 7.

[0037] Among them, the reciprocating motion loading assembly 2 is fixedly connected to the workbench 1, and the reciprocating motion loading assembly 2 has an output part, referring to Figure 3 The output part is connected with a sample rod 3 extending along the first horizontal direction. The free end of the sample rod 3 has a vertical first through hole 301. The first through hole 301 is used to install the moving sample 8. The free end of the sample rod 3 can also be designed with a lateral screw hole communicating with the first through hole 301. After the moving sample 11 is inserted into the first through hole 301, it is fixed by screwing a screw into the lateral screw hole. The fixing plate 10 is connected to the workbench 1. The fixing plate 10 is connected to the fixed sample holder 5 through the force measuring component 4. The fixed sample holder 5 is located below the first through hole 301. The top of the fixed sample holder 5 is used to install the fixed sample 11. The vertical force loading component 6 is fixedly connected to the upper surface of the workbench 1, and is used to apply a vertical loading force to the moving sample 8. The displacement measurement recording component 7 is fixedly connected to the workbench 1, and is used to record the relative displacement between the moving sample 8 and the fixed sample 11 along the first horizontal direction.

[0038] In the above embodiment, the first horizontal direction is the direction of the reciprocating motion output by the reciprocating motion loading assembly 2. The moving sample 8 is fixed at the end of the sample rod 3, the lower end of the moving sample 8 contacts the upper surface of the fixed sample 11, and a vertical loading force toward the fixed sample 11 is applied to the moving sample 8 through the vertical force loading assembly 6. The reciprocating motion loading assembly 2 outputs a reciprocating motion along the first horizontal direction to the sample rod 3, so that mutual friction motion occurs between the moving sample 8 and the fixed sample 11. The friction force between the moving sample 8 and the fixed sample 11 can be obtained by the force measuring assembly 4, the relative displacement of the moving sample 8 and the fixed sample 11 along the first horizontal direction can be obtained by the displacement measurement and recording assembly 7, and the vertical force loading assembly 6 can apply a vertical loading force to the moving sample 11. By using the high-frequency and high-precision micro-motion friction and wear testing device of the present application, a variety of wear resistance performance experiments can be realized and the accuracy of wear resistance experiments can be improved, such as the wear resistance performance experiments of materials under different vertical loading forces, the wear resistance performance experiments of moving samples 8 and fixed samples 11 of the same material, and the wear resistance performance experiments of moving samples 8 and fixed samples 11 of different materials.

[0039] In one embodiment of the present application, reference Figure 4 and Figure 5 The fixed sample holder 5 can be in a herringbone shape, and the fixed sample holder 5 has two mutually perpendicular legs 501, and the two legs 501 are arranged front and back along the first horizontal direction, and the angle between each leg 501 and the vertical direction is 45 degrees; the force measuring assembly 4 includes a sensor holder 401 and a dynamic force sensor 402 fixedly connected to the sensor holder 401; wherein, the lower end of each leg 501 contacts the force-bearing part of a dynamic force sensor 402, and the sensor holder 401 is fixedly connected to the fixed plate 10. In this case, since the two dynamic force sensors 402 are perpendicular to each other, in the reciprocating friction experiment, the forward force along the first horizontal direction can be obtained by the front dynamic force sensor 402 and calculated according to the decomposition, the backward force along the first horizontal direction can be obtained by the rear dynamic force sensor 402 and calculated according to the decomposition, and the vertical loading force can be calculated by the component forces of the two dynamic force sensors 402 in the vertical direction.

[0040] In another embodiment of the present application, the fixed sample holder 5 is cylindrical; the force measuring assembly 4 includes a sensor holder 401 and a dynamic force sensor 402 fixedly connected to the sensor holder 401; along the first horizontal direction, the front, rear and bottom of the fixed sample holder 5 are in contact with the force-bearing part of the dynamic force sensor 402 respectively, and the dynamic force sensor 402 is connected to the fixed plate 10 through the force sensor holder 401. In this embodiment, the dynamic force sensor 402 along the first horizontal direction is parallel to the moving direction of the moving sample 8, so the force obtained by the dynamic force sensor 402 is the actual force, which is more direct and does not require force decomposition calculation.

[0041] In the examples of this application, reference is made to Figure 6 The reciprocating motion loading assembly 2 comprises: a support frame 201, the support frame 201 comprises a column 2011, an upper beam 2012 arranged at the top of the column 2011 and extending along the first horizontal direction, and a lower beam 2013 arranged at the bottom of the column 2011 and extending along the first horizontal direction, and the upper beam 2012 and the lower beam 2013 are equal in length; a piezoelectric actuator 202, horizontally mounted on the column 2011, having an active end extending along the first horizontal direction; an elastic sheet 203, the two ends of which are respectively connected to the end of the upper beam 2012 and the end of the lower beam 2013; wherein the active end of the piezoelectric actuator 202 abuts against a side of the elastic sheet 203 close to the column 2011, and the side of the elastic sheet 203 away from the column 2011 is connected to the sample rod 3. In this embodiment, the piezoelectric actuator is an actuator that generates linear micro-motion, and its displacement is between a few microns and hundreds of microns. The piezoelectric actuator moves through the piezoelectric effect. The piezoelectric effect is the ability of certain materials to generate electric charge in response to mechanical stress or to deform in response to applied voltage. When voltage is applied to a piezoelectric material, it causes the material to contract or expand, and this deformation can be used to generate movement. In the embodiment of the present application, the piezoelectric actuator 202 is used for vibration excitation. An elastic sheet 203 is provided at the end of the action rod of the piezoelectric actuator 202, and the two ends of the elastic sheet 203 are respectively connected to the upper crossbeam 2012 and the lower crossbeam 2013. In this way, when the action end of the piezoelectric actuator 202 is extended, the deformation of the elastic sheet 203 can drive the sample rod 3 to move away from the column 2011. The elastic sheet 203 can promote the resetting of the action end of the piezoelectric actuator 202 under the action of the elastic restoring force, and drive the sample rod 3 to move in the direction close to the column 2011. By controlling the voltage frequency of the piezoelectric actuator 202, high-frequency reciprocating motion of the sample rod 3 can be achieved. In other embodiments, the reciprocating loading assembly 2 may also be other forms of linear motion components, such as an exciter, etc., and the present disclosure does not limit this.

[0042] In the examples of this application, reference is made to Figure 5The high-frequency and high-precision micro-motion friction and wear testing device may also include a horizontal adjustment seat, which includes a bottom plate 901, a lateral adjustment slide table 902, and a longitudinal adjustment slide table 903 arranged in sequence from bottom to top; wherein the bottom plate 901 is fixedly connected to the workbench 1, and the fixed plate 10 is fixedly connected to the longitudinal adjustment slide table 903. The horizontal adjustment seat can facilitate the experimenter to quickly adjust the position of the fixed sample 11 during the experiment.

[0043] In the examples of this application, reference is made to Figure 7 and Figure 8 The vertical force loading assembly 6 includes: a loading rod 601 vertically arranged with the sample rod 3, a downwardly protruding abutting rod 6011 in the middle of the loading rod 601, a conical head at the lower end of the abutting rod 6011, and a conical pit matching the conical head at the top of the movable sample 8; two first guide wheels 602, the two first guide wheels 602 are fixedly connected to the fixed plate 10 and are respectively located below the two ends of the loading rod 601; a second guide wheel 603, fixedly connected to the edge of the workbench 1; a third guide wheel 60 4, fixedly connected to the workbench 1 between the second guide wheel 603 and the two first guide wheels 602; and, a first traction rope 605 and two second traction ropes 606, one end of the first traction rope 605 is connected to the weight 607, and the other end is passed over the top of the first guide wheel 602 and the bottom of the third guide wheel 604 in turn, and then connected to one end of the two second traction ropes 606, and the other ends of the two second traction ropes 606 are passed over the bottom of the first guide wheel 602 respectively, and then connected to the end of the loading rod 601.

[0044] In another embodiment of the present application, each first guide wheel 602 may also be connected to a corresponding weight 607, and the weights 607 correspondingly connected to the two first guide wheels 602 only need to control their weights to be equal, and the present application does not impose any limitation on this.

[0045] In the examples of this application, reference is made to Fig. 9 The displacement measurement and recording component 7 may include: a reflector 701 arranged at the top of the fixed sample holder 5, the reflector 701 is located in front of the fixed sample 11 along the first horizontal direction, and the reflective surface of the reflector 701 is a vertical surface; and a laser vibrometer 702 located on one side of the fixed sample holder 5; wherein the reflector 701, the laser vibrometer 702 and the moving sample 8 are in the same horizontal plane, and the angle between the reflective surface and the first horizontal direction is 45 degrees, and the angle between the reflective surface and the laser vibrometer 702 is 45 degrees.

[0046] In the above embodiment, the displacement measurement and recording assembly 7 is used to measure the relative displacement of the moving sample 8 and the fixed sample 11 along the first horizontal direction.

[0047] The laser vibrometer 702 is used to measure the physical parameters of a vibrating object. The principle is that when a coherent laser beam is directed to a vibrating object, the frequency of the light is modulated due to the Doppler effect, resulting in a laser Doppler effect, which is manifested as a laser frequency deviation. Through laser interferometry technology, the laser beam that is irradiated and reflected from the object interferes with the reference beam, and finally the Doppler frequency deviation is detected on the photodetector, thereby obtaining the physical parameters of the vibrating object.

[0048] In the embodiment of the present application, the principle of using the displacement measurement and recording assembly 7 to measure the relative displacement of the moving sample 8 and the fixed sample 11 along the first horizontal direction is as follows: the laser emitted by the laser vibrometer 702 is first irradiated onto the reflection surface of the reflector 701. Since the incident angle is 45 degrees, the laser is emitted to the moving sample 8 after the first reflection. After the laser reaches the surface of the moving sample 8, it is reflected and returns to the laser vibrometer 702 along the original incident optical path. After the above process is performed twice, the laser vibrometer 702 will obtain the time change and the distance change from the laser output from the laser vibrometer 702 to the laser return to the laser vibrometer 702 for two adjacent times, thereby obtaining the relative speed of the moving sample 8 for two adjacent times. In the embodiment of the present application, since the moving sample 8 and the fixed sample 11 will have a tangential relative motion, that is, a relative motion along the first horizontal direction, the relative speed between the moving sample 8 and the fixed sample 11 can be obtained by multiple measurements in a short time, and the tangential relative displacement between the moving sample 8 and the fixed sample 11 can be obtained by integrating the relative speed over time.

[0049] It should be noted that, under normal circumstances, the moving sample 8 can reflect the laser when the surface roughness reaches 0.8. If the surface roughness of the moving sample 8 does not reach 0.8, a small piece of silver foil can be pasted to achieve a reflective effect.

[0050] It should be noted that in the above embodiments, the reflector 701 can be a plane mirror or a total reflection right angle prism, which is not limited in the present application. The plane mirror or the total reflection right angle prism can be glued to the fixed sample holder 5 by wax.

[0051] In the examples of this application, reference is made to Fig.10 The first through hole 301 is a rectangular hole, and the movable sample 8 includes an upper rectangular parallelepiped section 801 and a lower semi-cylindrical section 802, and the central axis of the semi-cylindrical section 802 is perpendicular to the first horizontal direction. By designing in this way, the movable sample 8 can be prevented from rotating during the experiment.

[0052] In other embodiments, the lower half of the movable sample 11 and the upper part of the fixed sample 5 can also be a plane, a cylinder, or a hemispherical surface, so that experiments with any combination of hemispherical surfaces, cylinders, and planes can be implemented.

[0053] In the examples of this application, reference is made to Fig.10 In the vertical direction, the thickness of the middle part of the sample rod 3 is smaller than the thickness of the two ends. Since the movable sample 8 and the fixed sample 11 will be worn out during the friction test, the movable sample 8 will be displaced vertically. This design can make the sample rod 3 easy to bend and deform, so that the movable sample 8 can better contact with the fixed sample 11.

[0054] In the examples of this application, reference is made to Fig.11 The end of the sample rod 3 has a spherical abutment head, and the side of the elastic sheet 203 facing the sample rod 3 has a spherical pit 2031 matching the abutment head. Through this design, the end of the sample rod 3 can adaptively act on the same point, so that the material wear resistance test is more accurate.

[0055] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0056] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0057] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A high-frequency and high-precision micro-motion friction and wear testing device, characterized in that: include: Workbench (1); a reciprocating loading assembly (2) fixedly connected to the workbench (1), the reciprocating loading assembly (2) having an output portion, the output portion being connected to a sample rod (3) extending along a first horizontal direction, the free end of the sample rod (3) having a vertical first through hole (301), the first through hole (301) being used for mounting a moving sample (8); A fixed plate (10), the fixed plate (10) being connected to the workbench (1), the fixed plate (10) being connected to a fixed sample holder (5) via a force measuring assembly (4), the fixed sample holder (5) being located below the first through hole (301), and the top end of the fixed sample holder (5) being used for mounting a fixed sample (11); A vertical force loading assembly (6) is fixedly connected to the upper surface of the workbench (1) and is used to apply a vertical loading force to the moving sample (8); And, a displacement measurement and recording component (7) fixedly connected to the workbench (1), the displacement measurement component being used to record the relative displacement between the moving sample (8) and the fixed sample (11) along the first horizontal direction.

2. The high-frequency and high-precision micro-motion friction and wear testing device according to claim 1 is characterized in that: The fixed sample support (5) is in the shape of a herringbone, and has two mutually perpendicular legs (501), the two legs (501) are arranged front and back along the first horizontal direction, and the angle between each leg (501) and the vertical direction is 45 degrees; The force measuring assembly (4) comprises a sensor bracket (401) and a dynamic force sensor (402) fixedly connected to the sensor bracket (401); The lower end of each of the legs (501) contacts a force-bearing portion of a dynamic force sensor (402), and the sensor bracket (401) is fixedly connected to the fixing plate (10).

3. The high-frequency and high-precision micro-motion friction and wear testing device according to claim 1 is characterized in that: The fixed sample support (5) is cylindrical; The force measuring assembly (4) comprises a sensor bracket (401) and a dynamic force sensor (402) fixedly connected to the sensor bracket (401); Along the first horizontal direction, the front, rear and bottom of the fixed sample support (5) are in contact with the force-bearing part of the dynamic force sensor (402) respectively, and the dynamic force sensor (402) is connected to the fixed plate (10) through the force sensor support (401).

4. The high-frequency and high-precision micro-motion friction and wear testing device according to claim 1 is characterized in that: The reciprocating loading assembly (2) comprises: A support frame (201), the support frame (201) comprising a column (2011), an upper crossbeam (2012) arranged at the top end of the column (2011) and extending along the first horizontal direction, and a lower crossbeam (2013) arranged at the bottom end of the column (2011) and extending along the first horizontal direction, and the upper crossbeam (2012) and the lower crossbeam (2013) are of equal length; A piezoelectric actuator (202) is horizontally mounted on the column (2011) and has an action end extending along a first horizontal direction; An elastic sheet (203), two ends of the elastic sheet (203) being respectively connected to an end of the upper crossbeam (2012) and an end of the lower crossbeam (2013); The active end of the piezoelectric actuator (202) abuts against a side of the elastic sheet (203) close to the column (2011), and a side of the elastic sheet (203) away from the column (2011) is connected to the sample rod (3).

5. The high-frequency and high-precision micro-motion friction and wear testing device according to claim 1 is characterized in that: It also includes a horizontal adjustment seat, which includes a base plate (901), a transverse adjustment sliding platform (902) and a longitudinal adjustment sliding platform (903) arranged in sequence from bottom to top; wherein the base plate (901) is fixedly connected to the workbench (1), and the fixed plate (10) is fixedly connected to the longitudinal adjustment sliding platform (903).

6. The high-frequency and high-precision micro-motion friction and wear testing device according to claim 1 is characterized in that: The vertical force loading component (6) comprises: A loading rod (601) vertically arranged with respect to the sample rod (3), wherein the middle portion of the loading rod (601) has a downwardly protruding abutting rod (6011), the lower end of the abutting rod (6011) is a conical head, and the top of the movable sample (8) has a conical pit matching the conical head; Two first guide wheels (602), the two first guide wheels (602) are fixedly connected to the fixing plate (10) and are respectively located below two ends of the loading rod (601); A second guide wheel (603) fixedly connected to the edge of the workbench (1); a third guide wheel (604) fixedly connected to the workbench (1) between the second guide wheel (603) and the two first guide wheels (602); And, a first traction rope (605) and two second traction ropes (606), one end of the first traction rope (605) is connected to the weight (607), and the other end is connected to one end of the two second traction ropes (606) after passing over the top of the first guide wheel (602) and the bottom of the third guide wheel (604) in sequence, and the other ends of the two second traction ropes (606) are connected to the end of the loading rod (601) after passing over from the bottom of the first guide wheel (602).

7. The high-frequency and high-precision micro-motion friction and wear testing device according to claim 1 is characterized in that: The displacement measurement and recording component (7) comprises: a reflector (701) disposed at the top of the fixed sample support (5), the reflector (701) being located in front of the fixed sample (11) along the first horizontal direction, and the reflective surface of the reflector (701) being a vertical surface; and, a laser vibrometer (702) located on one side of the fixed sample support (5); The reflector (701), the laser vibrometer (702) and the movable sample (8) are located in the same horizontal plane, and the angle between the reflective surface and the first horizontal direction is 45 degrees, and the angle between the reflective surface and the laser vibrometer (702) is 45 degrees.

8. The high-frequency and high-precision micro-motion friction and wear testing device according to claim 1 is characterized in that: The first through hole (301) is a rectangular hole, the movable sample (8) comprises an upper rectangular parallelepiped section (801) and a lower semi-cylindrical section (802), and the central axis of the semi-cylindrical section (802) is perpendicular to the first horizontal direction.

9. The high-frequency and high-precision micro-motion friction and wear testing device according to claim 1 is characterized in that: In the vertical direction, the thickness of the middle portion of the sample rod (3) is smaller than the thickness at both ends.

10. The high-frequency and high-precision micro-motion friction and wear testing device according to claim 1, characterized in that: The end of the sample rod (3) has a spherical abutment head, and the elastic sheet (203) has a spherical recess (2031) matching the abutment head on the side facing the sample rod (3).

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