CN108387475B - Swing friction fatigue testing machine - Google Patents
Swing friction fatigue testing machine Download PDFInfo
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- CN108387475B CN108387475B CN201810448539.1A CN201810448539A CN108387475B CN 108387475 B CN108387475 B CN 108387475B CN 201810448539 A CN201810448539 A CN 201810448539A CN 108387475 B CN108387475 B CN 108387475B
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 39
- 230000007246 mechanism Effects 0.000 claims abstract description 199
- 238000012360 testing method Methods 0.000 claims abstract description 51
- 230000008859 change Effects 0.000 claims abstract description 8
- 210000004907 gland Anatomy 0.000 claims description 2
- 230000003028 elevating effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 17
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a swinging friction fatigue testing machine, which comprises a testing machine frame, wherein the testing machine frame comprises a loading platform which is horizontally arranged, the loading platform is provided with a first bearing mechanism for bearing a sample, the testing machine frame is also provided with a swinging mechanism, the swinging mechanism is connected with a swinging rod mechanism, the lower part of the swinging rod mechanism is connected with a friction part, the friction part can be driven to rotate so as to rub the sample on the first bearing mechanism, and the testing machine frame also comprises a lifting mechanism which can push the loading platform to move so as to change the load between the first bearing mechanism and the friction part. According to the swing friction fatigue testing machine provided by the invention, the swing mechanism can push the swing rod mechanism to swing, so that the friction part at the lower part of the swing rod mechanism is driven to rotate, the test sample on the first bearing mechanism is rubbed, the friction fatigue of the test sample is tested, the stress condition of the test sample in the test process is similar to the stress condition in the actual work, and the test accuracy can be obviously improved.
Description
Technical Field
The invention relates to the technical field of test equipment, in particular to a swinging friction fatigue testing machine.
Background
The self-lubricating pad is made of a material with a low friction coefficient, is usually arranged in a joint bearing, a guided mechanism of a missile and other rotating parts, plays a role in reducing friction and prolonging the service life of the rotating parts, and the performance of the self-lubricating pad is an important factor influencing the service life of the rotating parts and is usually tested by a testing machine.
To accurately test the service life of self-lubricating liners, the movement patterns of such rotating parts are being studied in depth. Taking a joint bearing as an example, the joint bearing is a spherical bearing, the joint bearing can realize rotation in any direction, the joint bearing is composed of an outer ring with an inner spherical surface and an inner ring with an outer spherical surface, sliding friction exists between the outer ring and the inner ring in the rotation process, and a self-lubricating gasket is arranged between the inner ring and the outer ring. Common movements of the knuckle bearing include swinging, rotating, tilting and the like, and in the process of the movement of the knuckle bearing, a self-lubricating gasket is damaged due to uneven stress, and other rotating parts are similar to the movement form of the knuckle bearing.
Most of the test machines in the prior art simulate the movement of the knuckle bearing through rotation, and the test machine has the defects that the self-lubricating pad is subjected to uniform friction force in the test process and is not in conformity with the stress of the self-lubricating pad in the actual use, so that the test result is inaccurate.
Therefore, how to improve the accuracy of the test results of the testing machine is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a swing friction fatigue testing machine which can simulate the stress condition of a self-lubricating liner in the use process and has high accuracy of testing results.
In order to achieve the above purpose, the invention provides a swinging friction fatigue testing machine, which comprises a testing machine frame, wherein the testing machine frame comprises a loading platform which is horizontally arranged, the loading platform is provided with a first bearing mechanism for bearing a sample, the testing machine frame is also provided with a swinging mechanism, the swinging mechanism is connected with a swinging rod mechanism, the lower part of the swinging rod mechanism is connected with a friction part which can drive the friction part to rotate so as to rub the sample on the first bearing mechanism, and the testing machine frame also comprises a lifting mechanism which can push the loading platform to move so as to change the load between the first bearing mechanism and the friction part.
Preferably, the friction part has a spherical surface for friction of the sample, the first bearing mechanism is provided with a first cavity for cooperation with the spherical surface, and the sample is placed in the first cavity.
Preferably, the testing machine frame is further provided with an upper end workbench, the upper end workbench is provided with a second bearing mechanism, the second bearing mechanism is provided with a second cavity facing downwards, and the friction part is located between the first bearing mechanism and the second bearing mechanism.
Preferably, the testing machine frame is provided with an upright post along the vertical direction, the upper end workbench is fixed on the upper part of the upright post, and the loading platform is in sliding connection with the upright post.
Preferably, the swinging mechanism comprises a swinging rod, a telescopic mechanism and a rotating bracket,
The telescopic mechanism is hinged with the tester frame, and the telescopic end of the telescopic mechanism is hinged with the rotating bracket;
the rotating bracket is also hinged with the tester frame and the swinging rod respectively;
One end of the swinging rod is connected with the swinging rod mechanism through a joint bearing, the other end of the swinging rod is hinged with the rotating support through a swinging end bearing mechanism so that the swinging rod can rotate in a vertical plane, a rotating part device is arranged between the swinging end bearing mechanism and the rotating support, and the rotating part device can enable the swinging rod to rotate around a connecting point of the swinging rod and the rotating support;
The tester frame is provided with two sets of swinging mechanisms, swinging rods of the two sets of swinging mechanisms are connected with the swinging rod mechanisms, and a preset angle is formed between the two swinging rods.
Preferably, the swing end bearing mechanism includes a first end connected to the swing lever and a second end hinged to the rotating unit.
Preferably, the rotating part comprises a Y-shaped part body, a hinge hole for hinge connection with the second end is formed in the upper portion of the part body, the lower portion of the part body is cylindrical, a rotating bearing seat is arranged on the periphery of the part body, and the rotating bearing seat is fixedly connected with the rotating support.
Preferably, an axial load sensor for measuring the sample load is arranged between the loading platform and the lifting mechanism, an axial sensor connecting disc is arranged at the upper part of the axial load sensor, and the axial sensor connecting disc supports the loading platform through a conical loading disc.
Preferably, a swinging load sensor is arranged between the swinging rod and the rotating bracket, and the swinging load sensor is connected with the swinging end bearing mechanism through a swinging sensor connecting disc.
Preferably, the device further comprises a control device connected with the telescopic mechanism and the lifting mechanism and used for controlling the load and the swinging mode of the sample.
According to the swing friction fatigue testing machine provided by the invention, the outer ring of the joint bearing is simulated through the first bearing mechanism, the inner ring of the joint bearing is simulated through the friction part, the sample is arranged on the first bearing mechanism, the sample is rubbed through the friction part, the height of the loading platform is adjusted through the lifting part, and then the load on the sample is adjusted.
The swinging mechanism pushes the friction part to rotate through the swinging rod mechanism so as to simulate the movement of the knuckle bearing, and the rotating process of the friction part is similar to the actual movement process of the knuckle bearing and also comprises swinging, rotating, tilting movement and the like. In the testing process, the stress at the part of the contact point of the friction part and the first bearing mechanism is concentrated, which is the same as the stress condition of the sample in the actual work, thereby ensuring the accurate and reliable testing result of the sample.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a swing friction fatigue testing machine provided by the invention;
FIG. 2 is a side view of the swing friction fatigue testing machine provided by the invention;
FIG. 3 is a top view of the swing friction fatigue testing machine provided by the invention;
FIG. 4 is a schematic view of the friction portion of FIG. 1;
FIG. 5 is a schematic view of the loading platform in FIG. 1;
FIG. 6 is a schematic view of the swing link mechanism of FIG. 1;
FIG. 7 is a schematic view of the swing end bearing mechanism of FIG. 1;
FIG. 8 is a cross-sectional view of the connecting ring of the swing end bearing mechanism of FIG. 1;
FIG. 9 is a schematic view of the rotary part of FIG. 1;
Fig. 10 is a schematic view of the pivot bearing housing of fig. 1.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention will be further described in detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to better understand the aspects of the present invention.
Referring to fig. 1 to 10, fig. 1 is a schematic structural diagram of a swing friction fatigue testing machine according to the present invention; FIG. 2 is a side view of the swing friction fatigue testing machine provided by the invention; FIG. 3 is a top view of the swing friction fatigue testing machine provided by the invention; FIG. 4 is a schematic view of the friction portion of FIG. 1; FIG. 5 is a schematic view of the loading platform in FIG. 1; FIG. 6 is a schematic view of the swing link mechanism of FIG. 1; FIG. 7 is a schematic view of the swing end bearing mechanism of FIG. 1; FIG. 8 is a cross-sectional view of the connecting ring of the swing end bearing mechanism of FIG. 1; FIG. 9 is a schematic view of the rotary part of FIG. 1; fig. 10 is a schematic view of the pivot bearing housing of fig. 1.
The swing friction fatigue testing machine provided by the invention comprises a testing machine frame 1, as shown in fig. 1 to 3, wherein the testing machine frame 1 is provided with a loading platform 2 and a swing mechanism 3, and a sample is fixed on a first bearing mechanism 21 of the loading platform 2 in the testing process; the swinging mechanism 3 is connected with the swinging mechanism 4, the friction part 5 is connected to the lower part of the swinging mechanism 4, the friction part 5 is contacted with a sample, the swinging mechanism 3 drives the friction part 5 to rotate through the swinging mechanism 4, the friction part 5 rubs the sample on the first bearing mechanism 21, the tester frame 1 is also provided with a lifting mechanism 22, and the lifting mechanism 22 can push the loading platform 2 to move, so that the load born by the sample between the first bearing mechanism 21 and the friction part 5 is changed.
The first bearing mechanism 21 can be attached to the friction part 5 so as to apply a load to the sample, the first bearing mechanism 21 simulates an outer ring of the joint bearing, the friction part 5 simulates an inner ring of the joint bearing, as shown in fig. 4, the friction part 5 can be spherical or the outer surface of the friction part is provided with a spherical surface 51, the first bearing mechanism 21 is provided with a first cavity 210, the first cavity 210 is provided with an inner spherical surface matched with the spherical surface 51, and the first bearing mechanism 21 can apply a component force in the horizontal direction to the friction part 5 in the moving process of the friction part 5, so that the friction part 5 only rotates without translational motion in the horizontal direction.
The friction part 5 and the swing rod mechanism 4 can be connected in a welding, pin joint or threaded connection mode, and the like, and as the service lives of the samples in the joint bearings with different sizes are often greatly different, the friction fatigue of the samples needs to be tested for the joint bearings with different sizes, so that the swing friction fatigue testing machine needs to replace the friction part 5 with different sizes. In order to facilitate replacement, the friction part 5 and the swing rod mechanism 4 are connected in a detachable way such as threaded connection. Specifically, a mounting hole is formed in the friction part 5, the mounting hole is provided with internal threads, the lower part of the swing rod mechanism 4 is provided with external threads, and the internal threads and the external threads are mutually matched for connection; obviously, in order to cooperate with the friction part 5, the swinging friction fatigue testing machine can also be provided with first bearing mechanisms 21 with different sizes, so that the first bearing mechanisms 21 and the loading platform 2 are also usually connected in a detachable mode such as a bolt connection mode.
The oscillating bar mechanism 4 is arranged along the vertical direction, the friction part 5 is arranged at the lower part of the oscillating bar mechanism 4, the oscillating mechanism 3 can push the oscillating bar mechanism 4 to oscillate, and then the oscillating bar mechanism 4 drives the friction part 5 to rotate in the first bearing mechanism 21, and obviously, the oscillating bar mechanism 4 oscillates around the spherical center of the friction sphere 51. The swinging mechanism 3 is connected with the upper part of the swinging mechanism 4, and the included angle between the swinging mechanism 3 and the swinging mechanism 4 is continuously changed in the moving process, so that the swinging mechanism 3 and the swinging mechanism 4 can be connected through a joint bearing.
The swinging mechanism 3 needs to push the swinging rod mechanism 4 along the X-axis direction and the Y-axis direction, the swinging friction fatigue testing machine can push the swinging rod mechanism 4 through the independent swinging mechanism 3, at the moment, the swinging mechanism 3 can comprise a swinging component and a telescopic component, the swinging component pushes the swinging rod mechanism 4 to generate movement along the X-axis direction, the telescopic component pushes the swinging rod mechanism 4 to generate movement along the Y-axis direction, the swinging component can be a hydraulic swinging motor, and the telescopic component can be a hydraulic cylinder; the swing friction fatigue testing machine can also push the swing rod mechanisms 4 from two directions respectively through two sets of swing rod mechanisms 4, simulate the movement form of the parts connected with the inner rings of the joint bearing in actual work through superposition of the movements of the two sets of swing rod mechanisms, and the specific swing rod mechanisms 4 can comprise two hydraulic cylinders for pushing the swing rod mechanisms 4 from the X-axis direction and the Y-axis direction respectively. Of course, the user may also select the swing mechanism 3 with other structures according to needs, and the present invention is not limited thereto.
The lifting mechanism 22 can push the loading platform 2 to move up and down, and meanwhile drives the first bearing mechanism 21 to move up and down, so as to change the load borne by the sample, the lifting mechanism 22 can be specifically an axial loading cylinder, the axial loading cylinder is arranged along the vertical direction, a piston of the axial loading cylinder is fixedly connected with the loading platform 2, the piston can drive the loading platform 2 to move up and down when stretching, and a user can also adopt an air cylinder or an electric telescopic rod as the lifting mechanism 22 according to the requirement, so that the lifting mechanism is not limited.
In the embodiment, the swing friction fatigue testing machine is provided with the swing mechanism 3, the swing mechanism 3 pushes the friction part 5 to rub the sample on the first bearing mechanism 21 through the swing rod mechanism 4, the friction fatigue of the self-lubricating pad sample is tested, and the swing friction fatigue testing machine can simulate the stress condition of the joint bearing in the actual working process in the testing process, so that the testing result is more accurate; in addition, the friction part 5 and the swing rod mechanism 4 and the first bearing mechanism 21 and the loading platform 2 are connected in a detachable mode, so that the friction part 5 and the first bearing mechanism 21 can be replaced conveniently, and the swing friction fatigue testing machine can test the service lives of samples in the joint bearings with different sizes.
In order to improve the testing efficiency, the testing machine frame 1 may further be provided with an upper end workbench 6 above the friction part 5, the upper end workbench 6 is provided with a second bearing mechanism 61, the second bearing mechanism 61 is provided with a second cavity 610 with a downward direction, the second cavity 610 is also provided with an inner spherical surface matched with the spherical surface 51 of the friction part 5, a sample can be fixed in the second cavity 610 by sticking or the like, the friction part 5 is located between the first bearing mechanism 21 and the second bearing mechanism 61, and when the friction part 5 rotates, the sample in the first bearing mechanism 21 and the sample in the second bearing mechanism 61 can be simultaneously rubbed.
The upper end workbench 6 and the second bearing mechanism 61 are both provided with through holes penetrating through the thickness direction, as shown in fig. 3, the axis of each through hole passes through the sphere center of the sphere 51, the swing rod mechanism 4 passes through the through holes to be connected with the friction part 5, a reserved gap is arranged between the through holes and the swing rod mechanism 4, collision between the swing rod mechanism 4 and the side wall of the through holes in the swing process is avoided, the periphery of each through hole can be further provided with a corrugated sleeve 62, the lower end of each corrugated sleeve 62 is connected with the upper end workbench 6, the upper end of each corrugated sleeve 62 is connected with the swing rod mechanism 4, impact force can be absorbed, dust is prevented from falling into the swing rod mechanism 4 and the like. Since the knuckle bearing is also provided with a through hole penetrating the axial direction, the arrangement of the through hole in the second carrying mechanism 61 does not affect the test result, and of course the first carrying mechanism 21 may be provided with the same through hole.
The testing machine frame 1 is provided with upright posts 7, the upper end workbench 6 is supported by the upright posts 7, the number of the upright posts 7 is usually two or more, the loading platform 2 is positioned between the upright posts 7, and the loading platform can slide up and down along the upright posts 7 under the pushing of the lifting mechanism 22.
The upper part of the upright post 7 is provided with an upward step surface, the upper end workbench 6 is provided with a mounting hole corresponding to the position of the upright post 7, the step surface is propped against the periphery of the mounting hole, and the upper end of the upright post 7 is also provided with an upright post locking nut 71 for fixing the position of the upper end workbench 6; the loading platform 2 comprises a loading plate, the loading plate is provided with a cylindrical connecting part 23, the connecting part 23 comprises a cylindrical sleeve body 231, the cylindrical sleeve body 231 is sleeved on the periphery of the upright post 7, the inner side wall of the connecting part 23 is provided with a self-lubricating bearing 232 for reducing friction resistance between the connecting part 23 and the upright post 7, and the self-lubricating bearing 232 is fixed in the connecting part 23 through a connecting part bearing cover 233.
In this embodiment, the testing machine frame 1 is still equipped with upper end workstation 6, upper end workstation 6 is equipped with the second bearing mechanism 61 of second cavity 610 towards the bottom, swing friction fatigue testing machine once can test two samples, can greatly improve test efficiency, upper end workstation 6 supports through stand 7, stand 7 and loading platform 2 sliding connection simultaneously, stand 7 can carry out spacingly to loading platform 2, make loading platform 2 keep the level in-process that reciprocates, and then guarantee to apply to the load evenly distributed on the sample.
The movement forms of the knuckle bearings in different devices are different, and the influence of the movement forms of the knuckle bearings on the abrasion of the sample is large. In order to enable the swing friction fatigue testing machine to simulate various movement forms of a joint bearing, the swing friction fatigue testing machine is provided with two sets of swinging mechanisms 3, each swinging mechanism 3 comprises a swinging rod 33, a telescopic mechanism 31 and a rotating support 32, each rotating support 32 is hinged with the corresponding swinging rod 33, the corresponding telescopic mechanism 31 and the corresponding testing machine frame 1, the corresponding telescopic mechanism 31 pushes the corresponding rotating support 32 to rotate around a hinge point of the corresponding rotating support 32 with the corresponding testing machine frame 1, the swinging rod 33 is arranged in the horizontal direction, and the corresponding rotating support 32 can push the corresponding telescopic mechanism 31 to move in the horizontal direction in the rotating process; the swinging rods 33 of the two sets of swinging mechanisms 3 are connected with the swinging rod mechanisms 4, a preset angle is formed between the two swinging rods 33, and the horizontal movement of the two swinging rods 33 is overlapped and combined into various movement forms.
One end of the swinging rod 33 is connected with the swinging rod mechanism 4 through a joint bearing 42, as shown in fig. 6, two spherical hinge seats 41 are arranged on the upper portion of the swinging rod mechanism 4, the two spherical hinge seats 41 are respectively connected with the swinging rod 33 of the two sets of swinging mechanisms 3, the joint bearing 42 is specifically arranged between the spherical hinge seats 41 and the swinging rod mechanism 4, the spherical hinge seats 41 are fixed with the outer ring of the joint bearing 42, the swinging rod mechanism 4 is fixed with the inner ring of the joint bearing 42, the spherical hinge seats 41 can rotate relative to the swinging rod mechanism 4, and bearing locknuts 43 are arranged on the upper end of the swinging rod mechanism. The swing rods 33 of the two sets of swing mechanisms 3 have a preset angle, in this embodiment, the tester frame 1 is a cuboid frame 1, the two sets of swing mechanisms 3 are respectively located on two adjacent side surfaces of the tester frame 1, the swing rods 33 extend from the side surfaces of the tester frame 1 to the swing rod mechanism 4 in the center of the tester frame 1, the preset angle between the two swing rods 33 is 90 °, and of course, the preset angle can also be other values, which is not limited herein.
The other end of the swing lever 33 is connected to a swing end bearing mechanism 34, the swing end bearing mechanism 34 enables the swing lever 33 to swing in a vertical plane, a rotation unit 35 is further provided between the swing end bearing mechanism 34 and the rotation bracket 32, and the rotation unit 35 enables the swing lever 33 to rotate in a horizontal plane around a connection point between the swing lever 33 and the rotation bracket 32.
The swing end bearing mechanism 34, as shown in fig. 7 and 8, includes a first end 343 and a second end 344, wherein the first end 343 is plate-shaped, and the first end 343 and the swing rod 33 can be connected by bolt connection or welding; the second end 344 is a connecting ring, the connecting ring is arranged along the vertical direction, an angular contact bearing 3441 is arranged in the connecting ring, the connecting shaft 36 is fixed with the inner ring of the angular contact bearing 3441, so that the swinging rod 33 can rotate around the axis of the angular contact bearing 3441, and a shaft sleeve 3442 and a swinging end bearing gland 3443 are also arranged in the connecting ring to fix the position of the angular contact bearing 3441.
The structure of the rotating part assembly 35 is shown in fig. 9, and comprises a Y-shaped part assembly body 351, two branches on the upper part of the part assembly body 351 are respectively provided with a hinge hole, the two branches can be inserted into two sides of a connecting ring, a connecting shaft 36 is inserted into the two connecting holes and is fixed with an inner ring of a bearing in the connecting ring, the part assembly body 351 is hinged with a swinging end bearing mechanism 34, the lower part of the part assembly body 351 is cylindrical, a rotating bearing seat 352 is arranged on the periphery of the part assembly body 351, a tapered roller bearing 353 can be arranged between the part assembly body 351 and the rotating bearing seat 352, friction between the part assembly body 351 and the rotating bearing seat 352 in the rotating process is reduced, and the rotating bearing seat 352 is fixedly connected with a rotating bracket 32. The unit body 351 can rotate relative to the rotational socket 352, so that the swing lever 33 connected to the unit body 351 can swing in the horizontal direction relative to the rotational bracket 32.
The rotating bracket 32 has a triangular plate structure, the plate surface of which is arranged along the vertical direction, and three vertex angles are respectively connected with the rotating part 35, the telescopic mechanism 31 and the tester frame 1, as described above, the rotating bracket 32 is fixedly connected with the rotating bearing 352, specifically, the plate surface of the rotating bracket 32 can be provided with a plurality of connecting ribs, and the connecting ribs are fixed with the rotating bearing 352 and the like; the testing machine frame 1 further comprises a lower end workbench 8, the upright post 7 is fixed on the upper end face of the lower end workbench 8, a support seat 81 is further arranged on the side portion of the upper end face of the lower end workbench 8, a rotating shaft bearing seat 811 is fixed on the upper portion of the support seat 81, the rotating shaft bearing seat 811 is structured as shown in fig. 10, the rotating shaft bearing seat 811 is provided with a bearing hole penetrating in the horizontal direction, a deep groove ball bearing 812 is arranged in the bearing hole, a rotating shaft 82 penetrates through the bearing hole to be fixed with the inner ring of the deep groove ball bearing 812, the cross sections of the two side end portions of the rotating shaft 82 are rectangular, and two adjacent side faces of the side portion of the rotating shaft 82 are fixed with connecting ribs of the rotating support 32 through bolts; the telescopic mechanism 31 may be a cylinder or a hydraulic cylinder, etc., the cylinder sleeve is hinged with the tester frame 1, the piston is hinged with the rotating bracket 32, and the hinge manner can refer to the prior art, and the details are not repeated here. The rotating bracket 32 may alternatively have a shape other than a triangle, which is not limited herein.
In the present embodiment, the swinging mechanism 3 includes the swinging rod 33, the rotating bracket 32, and the telescopic mechanism 31 can push the rotating bracket 32 to rotate around the rotating shaft 82, thereby pushing the swinging rod 33 to move in the axial direction. The swing friction fatigue testing machine is provided with two sets of swinging mechanisms 3, the superimposed movement track of the two sets of swinging mechanisms 3 can simulate the actual working condition of the joint bearing, and the action of the swinging mechanisms 3 can be controlled through a telescopic mechanism 31. In the process of movement superposition of the two sets of swinging mechanisms 3, the swinging rod 33 swings horizontally and vertically, and the swinging end bearing mechanism 34 and the rotating part 35 are arranged between the swinging rod 33 and the rotating bracket 32, so that the swinging rod 33 can swing flexibly, and the stress and friction between the swinging rod 33 and the rotating bracket 32 are reduced.
In order to detect the load borne by the sample, an axial load sensor 221 is arranged at the upper part of the piston of the axial loading cylinder, an axial sensor connecting disc 222 is arranged at the upper part of the axial load sensor 221, the axial sensor connecting disc 222 supports the loading platform 2 through a conical loading disc 223, and when the piston of the axial loading cylinder extends out, the axial load sensor 221 can detect the pressure between the piston and the loading platform 2, so that the axial load borne by the sample is obtained.
The swing friction fatigue testing machine further includes a swing load sensor 341 provided between the swing lever 33 and the rotating bracket 32, wherein the swing load sensor 341 is fixed to the swing lever 33 and is fixed to the first end 344 of the swing bearing mechanism via a swing sensor land 342, and when the swing lever 33 moves axially, the swing load sensor 341 can detect the load applied to the swing lever mechanism 4 when it swings.
The swing friction fatigue testing machine further comprises a control device, wherein the control device is connected with the axial load sensor 221, the swing load sensor 341, the telescopic mechanism 31 and the lifting mechanism 22, and can judge the load born by the sample according to the measured value of the sensor, and change the load born by the sample or change the movement mode of the friction part 5 through the telescopic mechanism 31 and the lifting mechanism 22. The control device can be an MCU controller, a singlechip or a microcomputer, and the specific functions and structures of the control device can refer to the prior art and are not repeated here.
In this embodiment, the swing friction fatigue testing machine measures the load borne by the sample through the axial load sensor 221 and the swing load sensor 341, and the control device can receive the measurement result of the sensor, change the load borne by the sample through the telescopic mechanism 31 and the lifting mechanism 22, and control the movement mode of the friction part 5, so that the swing friction fatigue testing machine can detect parameters such as load, friction torque, friction coefficient, wear amount, swing angle, speed and the like in real time, and objectively and practically reflect the comprehensive performance of the sample under the use condition.
In addition, the knuckle bearing also often works in a high-temperature or low-temperature environment, and the tester frame 1 is also provided with a closed space for testing the service life of the self-lubricating pad in the high-temperature or low-temperature environment. Specifically, the number of the upright posts 7 is four, and the upright posts are rectangular and distributed around the friction part 5, side walls are arranged on four sides between the lower end workbench 8 and the upper end workbench 6, the space among the upper end workbench 6, the lower end workbench 8 and the side walls is a closed space, a heating device or a cooling device can be arranged in the closed space to change the temperature in the closed space, the heating device can refer to an electric heater and the like, and the cooling device can refer to an air conditioner and the like.
In the embodiment, the swing friction fatigue testing machine is provided with a closed space, and the self-lubricating liner is simulated to work in a high-temperature or low-temperature environment by changing the temperature of the closed space, so that the service life of the self-lubricating liner in an extreme environment is tested.
It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The swing friction fatigue testing machine provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (7)
1. The swinging friction fatigue testing machine is characterized by comprising a testing machine frame (1), wherein the testing machine frame (1) comprises a loading platform (2) which is horizontally arranged, the loading platform (2) is provided with a first bearing mechanism (21) for bearing a sample, the testing machine frame (1) is also provided with a swinging mechanism (3), the swinging mechanism (3) is connected with a swinging rod mechanism (4), the lower part of the swinging rod mechanism (4) is connected with a friction part (5) and can drive the friction part (5) to rotate so as to rub the sample on the first bearing mechanism (21), and the testing machine frame (1) also comprises a lifting mechanism (22) which can push the loading platform (2) to move so as to change the load between the first bearing mechanism (21) and the friction part (5);
The swing rod mechanism (4) is arranged along the vertical direction, and the swing mechanism (3) can push the swing rod mechanism (4) to swing so as to drive the friction part (5) to rotate in the first bearing mechanism (21);
The swinging mechanism (3) comprises a swinging rod (33), a telescopic mechanism (31) and a rotating bracket (32),
The telescopic mechanism (31) is hinged with the tester frame (1), and the telescopic end of the telescopic mechanism (31) is hinged with the rotating bracket (32);
the rotating bracket (32) is also hinged with the tester frame (1) and the swinging rod (33) respectively;
One end of the swinging rod (33) is connected with the swinging rod mechanism (4) through a joint bearing, the other end of the swinging rod (33) is hinged with the rotating support (32) through a swinging end bearing mechanism (34) so that the swinging rod (33) can rotate in a vertical plane, a rotating part (35) is further arranged between the swinging end bearing mechanism (34) and the rotating support, and the rotating part (35) can enable the swinging rod (33) to rotate around a connecting point of the swinging rod (33) and the rotating support (32);
The tester frame (1) is provided with two sets of swinging mechanisms (3), swinging rods (33) of the two sets of swinging mechanisms (3) are connected with the swinging rod mechanisms (4), and a preset angle is formed between the two swinging rods (33);
the swing end bearing mechanism (34) comprises a first end (343) and a second end (344), the first end (343) is connected with the swing rod (33), the second end (344) is hinged with the rotating part (35), the second end (344) is a connecting ring, an angular contact bearing (3441) is arranged in the connecting ring, the swing rod (33) can rotate around the axis of the angular contact bearing (3441), and a shaft sleeve (3442) and a swing end bearing gland (3443) are further arranged in the connecting ring and used for fixing the angular contact bearing (3441);
The rotating part assembly (35) comprises a Y-shaped part assembly body (351), a hinge hole for being hinged with the second end (344) is formed in the upper portion of the part assembly body (351), a connecting shaft (36) is fixed to the inner ring of the angular contact bearing (3441), and the connecting shaft (36) is hinged with the hinge hole;
The utility model discloses a portion dress body, including dress body (351), portion dress body (351) lower part is cylindricly, portion dress body (351) periphery is equipped with rotation bearing (352), rotation bearing (352) with rotate support (32) fixed connection, portion dress body (351) with be equipped with tapered roller bearing (353) between rotation bearing (352), portion dress body (351) can for rotation bearing (352) are rotated, so that with portion dress body (351) are connected swinging arms (33) can for rotate support (32) along the horizontal direction swing.
2. The oscillating friction fatigue testing machine according to claim 1, wherein the friction part (5) has a spherical surface (51) for friction of a sample, the first bearing mechanism (21) is provided with a first cavity (210) for cooperation with the spherical surface (51), and the sample is placed in the first cavity (210).
3. The oscillating friction fatigue testing machine according to claim 2, characterized in that the testing machine frame (1) is further provided with an upper end table (6), the upper end table (6) is provided with a second bearing mechanism (61), the second bearing mechanism (61) has a second cavity (610) directed downwards, and the friction part (5) is located between the first bearing mechanism (21) and the second bearing mechanism (61).
4. A swing friction fatigue testing machine according to claim 3, wherein the testing machine frame (1) is provided with a stand column (7) in a vertical direction, the upper end working table (6) is fixed on the upper portion of the stand column (7), and the loading platform (2) is slidably connected with the stand column (7).
5. The swing friction fatigue testing machine according to claim 4, wherein an axial load sensor (221) for measuring a sample load is arranged between the loading platform (2) and the lifting mechanism (22), an axial sensor connecting disc (222) is arranged at the upper part of the axial load sensor (221), and the axial sensor connecting disc (222) supports the loading platform (2) through a conical loading disc (223).
6. The swing friction fatigue testing machine according to claim 5, wherein a swing load sensor (341) is provided between the swing lever (33) and the rotating bracket (32), and the swing load sensor (341) is connected to the swing end bearing mechanism (34) through a swing sensor connection pad (342).
7. The swing friction fatigue testing machine according to claim 6, further comprising a control device connected to the telescopic mechanism (31) and the elevating mechanism (22) for controlling the load of the test specimen and the swing pattern.
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| CN109596448B (en) * | 2018-12-21 | 2021-04-20 | 中国船舶重工集团公司第七一0研究所 | Wear resistance test device for mooring rope system |
| CN113624496B (en) * | 2021-09-09 | 2024-10-25 | 南京林业大学 | Testing machine for testing life of roller bearing |
| CN118913977A (en) * | 2024-08-28 | 2024-11-08 | 潮州市潮安区华光鞋业有限公司 | Wear-resistant sandal fabric detection equipment and detection method based on different roughness conversion |
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