Metal material fatigue surface damage testing equipment and testing method thereof

Abstract

The invention belongs to the technical field of metal material fatigue testing, and provides metal material fatigue surface damage testing equipment and a testing method thereof.The metal material fatigue surface damage testing equipment comprises a base, a lifting mechanism is arranged on the base, two sliding plate assemblies are horizontally arranged on the lifting mechanism in a sliding mode, and a distance adjusting piece is arranged between the two sliding plate assemblies; the vibration testing assembly comprises two vibration connecting mechanisms, the two ends of the metal sample are connected with the two vibration connecting mechanisms respectively, the two vibration connecting mechanisms are arranged on the two sliding plate assemblies through angle adjusting assemblies respectively, and the angle adjusting assemblies are used for adjusting the vibration connecting mechanisms to be in the horizontal state or the vertical state. When the two vibration connecting mechanisms are in the vertical state, the bottom supporting rod piece is adjusted to be in the vertical state. And the image collector is used for collecting the surface image of the metal sample. According to the invention, horizontal tensile fatigue test or vertical bending fatigue test can be carried out on the metal sample.

Description

Technical Field

[0001] The invention belongs to the technical field of metal material fatigue testing, and in particular relates to a metal material fatigue surface damage testing device and a testing method thereof. Background Art

[0002] The metal material fatigue surface damage test equipment is used to test the metal material to detect its surface damage when it is in different fatigue levels under the action of force.

[0003] The metal material fatigue surface damage testing equipment in the related technology can usually only load vibration or tensile loads on the metal specimens along the length direction or axial direction, but cannot bend the metal specimens, and cannot test the fatigue surface damage of the metal specimens under repeated bending conditions. Summary of the invention

[0004] The purpose of the present invention is to provide a metal material fatigue surface damage testing device and a testing method thereof to solve the above-mentioned problems and achieve the purpose of being able to perform horizontal tensile fatigue testing or vertical bending fatigue testing on metal specimens.

[0005] To achieve the above object, the present invention provides the following solution: a metal material fatigue surface damage testing device, comprising:

[0006] A base, wherein a lifting mechanism is disposed on the base, and two sets of sliding plate assemblies are horizontally slidably disposed on the lifting mechanism, and a spacing adjustment member is disposed between the two sliding plate assemblies;

[0007] A vibration test assembly, comprising two sets of vibration connection mechanisms, two ends of a metal sample are respectively connected to the two vibration connection mechanisms, the two vibration connection mechanisms are respectively arranged on the two sliding plate assemblies through angle adjustment assemblies, the angle adjustment assemblies are used to adjust the vibration connection mechanisms to be in a horizontal state or a vertical state, and also comprising a tiltable bottom support rod, when the two vibration connection mechanisms are in a vertical state, the bottom support rod is adjusted to a vertical state;

[0008] An image collector is used to collect images of the surface of a metal sample.

[0009] Preferably, the sliding plate assembly includes a vertical connecting plate, the top and bottom of the vertical connecting plate are respectively fixedly connected with slide plates, the vertical connecting plate is slidably connected to the lifting mechanism through the two slide plates, and the two angle adjustment assemblies are respectively arranged on the same side of the two vertical connecting plates.

[0010] Preferably, the angle adjustment assembly includes a connecting plate and an arc-shaped slide groove extending through the side wall of the vertical connecting plate, one end of the connecting plate is hinged on the side wall of the vertical connecting plate, a locking member is provided on the side wall of the connecting plate close to the vertical connecting plate, the locking member is slidably connected in the arc-shaped slide groove, and the locking member is used to lock the connecting plate in a vertical state or a horizontal state.

[0011] Preferably, the locking member comprises a first sliding groove provided on a side wall of the connecting plate close to the vertical connecting plate, a first fixing bolt is slidably connected in the first sliding groove, the first fixing bolt is slidably connected in the arc-shaped sliding groove, a first nut is threadedly connected on the first fixing bolt, and the first nut is in contact with a side wall of the vertical connecting plate away from the connecting plate;

[0012] Both ends of the arc-shaped sliding groove are respectively connected to limiting grooves. When the connecting plate is in a horizontal state or a vertical state, the first nut is located in one of the limiting grooves.

[0013] Preferably, the vibration connection mechanism includes a shell, the shell is fixedly connected to the connecting plate, a sliding rod is slidably connected in the shell, one end of the sliding rod is fixedly connected to a clamping seat, the clamping seat is located outside the shell and is used to clamp the metal sample, one end of the sliding rod away from the clamping seat is hinged to one end of a connecting rod, a turntable is rotatably connected in the shell, the edge of the turntable is hinged to the other end of the connecting rod, a first motor is fixedly connected in the shell, and the first motor is transmission-connected to the turntable.

[0014] Preferably, the lifting mechanism includes a plurality of connecting rods, the slide plate is slidably connected to the connecting rods, both ends of the connecting rods are respectively fixedly connected with connecting seats, the connecting seats are located on the outside of the vertical connecting plate, a telescopic support rod is vertically fixedly connected between two connecting seats located on the same side of the vertical connecting plate, and the bottom of the telescopic support rod is fixedly connected to the top of the base.

[0015] Preferably, the spacing adjustment member includes a threaded seat and a fixed seat, the threaded seat is fixedly connected to the top of the slide plate at the top of one of the vertical connecting plates, the fixed seat is fixedly connected to the top of the slide plate at the top of another of the vertical connecting plates, a second motor is horizontally fixedly connected in the fixed seat, a screw rod is horizontally threadedly connected in the threaded seat, and one end of the screw rod is transmission connected to the second motor.

[0016] Preferably, the image collector is fixedly connected to the middle part of the connecting rod.

[0017] Preferably, the bottom support rod includes a hinge seat fixedly connected to the top center of the base, one end of the support rod is hinged in the hinge seat, the other end of the support rod is fixedly connected to a support head, and a position locking member is arranged between the support rod and the hinge seat, and the position locking member is used to keep the support rod in a vertical state.

[0018] A method for testing surface damage of fatigue of metal materials, the operating steps comprising:

[0019] For horizontal tensile fatigue testing:

[0020] The two vibration connection mechanisms are respectively adjusted to a horizontal state through two angle adjustment components;

[0021] The metal sample is placed between the two vibration connection mechanisms, and the distance between the two vibration connection mechanisms is adjusted by a spacing adjustment member, so that both ends of the metal sample are connected to the two vibration connection mechanisms respectively;

[0022] The vibration connection mechanism is started to horizontally stretch the two ends of the metal sample, and the surface changes of the metal sample are recorded by an image collector;

[0023] For vertical bending fatigue test:

[0024] The two vibration connection mechanisms are respectively adjusted to a vertical state through two angle adjustment components, and the bottom support rod is adjusted to a vertical state;

[0025] The metal sample is placed between the two vibration connection mechanisms, and the distance between the two vibration connection mechanisms is adjusted by a spacing adjustment member so that both ends of the metal sample are connected to the two vibration connection mechanisms respectively, and the height of the vibration connection mechanisms is adjusted by a lifting mechanism so that the middle of the metal sample abuts against the top of the bottom support rod;

[0026] The vibrating connection mechanism is started to perform vertical reciprocating bending on both ends of the metal sample, and the surface changes of the metal sample are recorded by an image collector.

[0027] Compared with the prior art, the present invention has the following advantages and technical effects: the main function of the vibration connection mechanism is to clamp the two sides of the metal sample and reciprocately pull the end of the metal sample along a fixed direction through vibration; the main function of the lifting mechanism is to adjust the height of the sliding plate assembly so that the metal sample abuts against the top of the bottom support rod; the main function of the spacing adjustment member is to adjust the distance between the two sliding plate assemblies, and then adjust the distance between the two vibration connection mechanisms to achieve clamping of the two ends of the metal sample; the main function of the angle adjustment assembly is to adjust the vibration connection mechanism to a horizontal state, so that a horizontal tensile fatigue test can be performed, or to adjust the vibration connection mechanism to a vertical state, and perform a vertical bending fatigue test with the cooperation of the bottom support rod. On the whole, the present invention can perform a horizontal tensile fatigue test or a vertical bending fatigue test on the metal sample according to the test needs by setting the two vibration connection mechanisms as a structure with adjustable angles, and collect and record surface damage through an image collector, thereby increasing the test items and achieving multi-purpose of one machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the present invention in a horizontal tensile fatigue test state;

[0030] Figure 2 Another schematic diagram of the present invention in a horizontal tensile fatigue test state;

[0031] Figure 3 This is a schematic diagram of the angle adjustment component of the present invention;

[0032] Figure 4 is a cross-sectional view of a connecting rod of the present invention;

[0033] Figure 5 It is a cross-sectional view of the vibration connection mechanism of the present invention;

[0034] Figure 6 It is a schematic diagram of the position locking member of the present invention;

[0035] Figure 7 It is a schematic diagram of the present invention in a vertical bending fatigue test state;

[0036] Among them, 1. base; 2. telescopic support rod; 3. connecting seat; 4. slide plate; 5. vertical connecting plate; 6. arc-shaped slide groove; 7. vibration connecting mechanism; 71. shell; 72. turntable; 73. connecting rod; 74. first motor; 75. slide rod; 76. clamping seat; 8. limit groove; 9. threaded seat; 10. screw rod; 11. fixed seat; 12. second motor; 13. connecting rod; 14. groove; 15. hinged seat; 16. support rod; 17. support head; 18. first fixing bolt; 19. first nut; 20. connecting plate; 21. first slide groove; 22. second slide groove; 23. second fixing bolt; 24. second nut; 25. image collector. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Reference Figure 1-Figure 7 The present invention provides a metal material fatigue surface damage testing device, comprising:

[0040] A base 1 is provided with a lifting mechanism, two sets of sliding plate assemblies are horizontally slidably provided on the lifting mechanism, and a spacing adjustment member is provided between the two sliding plate assemblies;

[0041] A vibration test assembly, comprising two sets of vibration connection mechanisms 7, two ends of the metal sample are respectively connected to the two vibration connection mechanisms 7, the two vibration connection mechanisms 7 are respectively arranged on two sliding plate assemblies through angle adjustment assemblies, the angle adjustment assemblies are used to adjust the vibration connection mechanisms 7 to be in a horizontal state or a vertical state, and also comprising a tiltable bottom support rod, when the two vibration connection mechanisms 7 are in a vertical state, the bottom support rod is adjusted to a vertical state;

[0042] The image collector 25 is used to collect the surface image of the metal sample.

[0043] The main function of the vibration connection mechanism 7 is to clamp the two sides of the metal sample and pull the end of the metal sample back and forth along a fixed direction through vibration; the main function of the lifting mechanism is to adjust the height of the sliding plate assembly so that the metal sample abuts against the top of the bottom support rod; the main function of the spacing adjustment member is to adjust the distance between the two sliding plate assemblies, and then adjust the distance between the two vibration connection mechanisms 7 to achieve clamping of the two ends of the metal sample; the main function of the angle adjustment assembly is to adjust the vibration connection mechanism 7 to a horizontal state, so that a horizontal tensile fatigue test can be performed, or to adjust the vibration connection mechanism 7 to a vertical state, and perform a vertical bending fatigue test with the cooperation of the bottom support rod. On the whole, the present invention can perform a horizontal tensile fatigue test or a vertical bending fatigue test on the metal sample according to the test needs by setting the two vibration connection mechanisms as a structure with adjustable angles, and collect and record surface damage through an image collector, thereby increasing the test items and achieving multi-purpose use of one machine.

[0044] A further optimized solution is that the sliding plate assembly includes a vertical connecting plate 5, the top and bottom of the vertical connecting plate 5 are respectively fixedly connected with a slide plate 4, the vertical connecting plate 5 is slidably connected to the lifting mechanism through two slide plates 4, and the two angle adjustment assemblies are respectively arranged on the same side of the two vertical connecting plates 5.

[0045] A further optimized solution is that the angle adjustment assembly includes a connecting plate 20 and an arc-shaped slide groove 6 that penetrates the side wall of the vertical connecting plate 5. One end of the connecting plate 20 is hinged on the side wall of the vertical connecting plate 5. A locking member is provided on the side wall of the connecting plate 20 close to the vertical connecting plate 5. The locking member is slidably connected in the arc-shaped slide groove 6. The locking member is used to lock the connecting plate 20 in a vertical state or a horizontal state.

[0046] In a further optimized solution, the locking member includes a first slide groove 21 provided on the side wall of the connecting plate 20 close to the vertical connecting plate 5, a first fixing bolt 18 is slidably connected in the first slide groove 21, the first fixing bolt 18 is slidably connected in the arc-shaped slide groove 6, a first nut 19 is threadedly connected on the first fixing bolt 18, and the first nut 19 is in contact with the side wall of the vertical connecting plate 5 away from the connecting plate 20;

[0047] Both ends of the arc-shaped slide groove 6 are respectively connected to the limiting grooves 8 . When the connecting plate 20 is in a horizontal state or a vertical state, the first nut 19 is located in a limiting groove 8 .

[0048] like Figure 1-Figure 4 and Figure 7As shown, the arc-shaped slide groove 6 is a 1 / 4 arc. When the connecting plate 20 is in a horizontal state, the first fixing bolt 18 is located at the bottom of the arc-shaped slide groove 6, and by tightening the first nut 19, the connecting plate 20 is locked on the vertical connecting plate 5, thereby ensuring that the vibration connecting mechanism 7 is in a horizontal state, which is convenient for horizontal tensile fatigue testing. If a vertical bending fatigue test is required, the operator only needs to loosen the first nut 19, and then slide the first fixing bolt 18 out of the bottom limiting groove 8 along the first slide groove 21, and then rotate the connecting plate 20 around the rotating axis with the vertical connecting plate 5 to a vertical state. At this time, the first fixing bolt 18 can slide downward along the first slide groove 21 to the limiting groove 8 at the top, and then tighten the first nut 19 to fix the connecting plate 20 to a vertical state, thereby ensuring that the vibration connecting mechanism 7 is in a vertical state, which is convenient for vertical bending fatigue testing, such as Figure 7 shown.

[0049] A further optimized solution is that the vibration connection mechanism 7 includes a shell 71, which is fixedly connected to the connecting plate 20. A slide rod 75 is slidably connected inside the shell 71, and one end of the slide rod 75 is fixedly connected to a clamping seat 76. The clamping seat 76 is located outside the shell 71 and is used to clamp the metal sample. One end of the slide rod 75 away from the clamping seat 76 is hinged to one end of a connecting rod 73. A turntable 72 is rotatably connected inside the shell 71, and the edge of the turntable 72 is hinged to the other end of the connecting rod 73. A first motor 74 is fixedly connected inside the shell 71, and the first motor 74 is transmission-connected to the turntable 72.

[0050] like Figure 5 As shown, the first motor 74 rotates to drive the turntable 72 to rotate, and the turntable 72 drives the slide bar 75 to slide back and forth in the housing 71 by pulling the connecting rod 73, thereby driving the clamping seat 76 to vibrate back and forth.

[0051] A further optimized solution is that the lifting mechanism includes a plurality of connecting rods 13, the slide plate 4 is slidably connected to the connecting rods 13, both ends of the connecting rods 13 are fixedly connected with connecting seats 3, the connecting seats 3 are located on the outside of the vertical connecting plate 5, and a telescopic support rod 2 is vertically fixedly connected between the two connecting seats 3 located on the same side of a vertical connecting plate 5, and the bottom of the telescopic support rod 2 is fixedly connected to the top of the base 1.

[0052] like Figure 1 As shown, a total of four groups of telescopic support rods 2 are arranged on the base 1, and a hydraulic cylinder can be selected for the telescopic support rods 2. The telescopic end of the telescopic support rod 2 is arranged downward and fixedly connected to the base 1, and the cylinder wall of the telescopic support rod 2 is fixedly connected to the connecting seat 3. Two groups of connecting rods 13 are horizontally fixedly connected between two connecting seats 3 located at both ends of the base 1 and at the same horizontal height, and the slide plate 4 is slidably connected between the two connecting rods 13.

[0053] A further optimized solution is that the spacing adjustment member includes a threaded seat 9 and a fixed seat 11, the threaded seat 9 is fixedly connected to the top of the skateboard 4 at the top of a vertical connecting plate 5, the fixed seat 11 is fixedly connected to the top of the skateboard 4 at the top of another vertical connecting plate 5, a second motor 12 is horizontally fixedly connected in the fixed seat 11, a screw rod 10 is horizontally threadedly connected in the threaded seat 9, and one end of the screw rod 10 is transmission connected to the second motor 12.

[0054] like Figure 1 As shown, the second motor 12 rotates to drive the screw rod 10 to rotate, and the screw rod 10 and the threaded seat 9 are threadedly transmitted, so that the threaded seat 9 moves toward the fixed seat 11, so that the two vertical connecting plates 5 can be pulled together, thereby changing the distance between the two vibrating connecting mechanisms 7. Similarly, the distance between the two vibrating connecting mechanisms 7 can be increased by controlling the second motor 12 to reverse.

[0055] As a further optimization scheme, a plurality of studs (not shown) may be provided on the connecting rod 13, and the threaded ends of the studs abut against the side walls of the slide plate 4. After the position of the slide plate 4 is adjusted, the position of the slide plate 4 may be fixed by tightening the plurality of studs.

[0056] According to a further optimized solution, the image collector 25 is fixedly connected to the middle of the connecting rod 13 .

[0057] A further optimized solution is that the bottom support rod includes a hinge seat 15 fixedly connected to the top center of the base 1, one end of a support rod 16 is hinged in the hinge seat 15, the other end of the support rod 16 is fixedly connected to a support head 17, and a position locking member is provided between the support rod 16 and the hinge seat 15, and the position locking member is used to keep the support rod 16 in a vertical state.

[0058] According to a further optimized solution, the position locking member includes a groove 14 formed on the top of the hinge seat 15 and a second slide groove 22 formed on the support rod 16 , a second fixing bolt 23 is slidably connected in the second slide groove 22 , and a second nut 24 is threadedly connected to the second fixing bolt 23 .

[0059] When the support rod 16 is in a vertical position, the second fixing bolt 23 can slide into the groove 14 , and then the second nut 24 is tightened to vertically fix the support rod 16 in the hinge seat 15 .

[0060] A further optimized solution further includes a terminal (not shown in the figure), which is electrically connected to the first motor 74, the second motor 12, the image collector 25 and the control device of the telescopic support rod 2.

[0061] According to a further optimized solution, the clamping seat 76 can be a universal tensile testing machine clamp.

[0062] A method for testing surface damage of fatigue of metal materials, the operating steps comprising:

[0063] For horizontal tensile fatigue testing:

[0064] Adjust the two vibration connection mechanisms 7 to a horizontal state respectively through two angle adjustment components;

[0065] First, the two connecting plates 20 are adjusted and fixed to a horizontal state, so that the two vibration connecting mechanisms 7 are in a horizontal state.

[0066] Place the metal sample between the two vibration connection mechanisms 7, and adjust the distance between the two vibration connection mechanisms 7 by using the spacing adjustment member, so that both ends of the metal sample are connected to the two vibration connection mechanisms 7 respectively;

[0067] By controlling the second motor 12 to control the distance between the two clamping seats 76 , it is convenient to fix the two ends of the metal sample to the two clamping seats 76 respectively.

[0068] The vibration connection mechanism 7 is started to horizontally stretch the two ends of the metal sample, and the surface changes of the metal sample are recorded by the image collector 25;

[0069] The first motor 74 is started to make the two clamping seats 76 vibrate back and forth in opposite directions, so as to implement a horizontal reciprocating tensile fatigue test on the metal sample, and the surface changes of the metal sample are recorded by the image collector 25 .

[0070] For vertical bending fatigue test:

[0071] The two vibration connection mechanisms 7 are respectively adjusted to a vertical state through two angle adjustment components, and the bottom support rod is adjusted to a vertical state;

[0072] First, the two connecting plates 20 are adjusted and fixed to a vertical state, so that the two vibration connecting mechanisms 7 are in a vertical state.

[0073] Place the metal sample between the two vibration connection mechanisms 7, adjust the distance between the two vibration connection mechanisms 7 by using the spacing adjustment member, so that both ends of the metal sample are connected to the two vibration connection mechanisms 7 respectively, and adjust the height of the vibration connection mechanism 7 by using the lifting mechanism, so that the middle of the metal sample abuts against the top of the bottom support rod;

[0074] First, the telescopic support rod 2 is controlled to extend, and the height of the vibration connection mechanism 7 is raised and adjusted, and then the distance between the two clamping seats 76 is controlled by the second motor 12, so that the two ends of the metal sample are fixedly connected to the two clamping seats 76, and then the support rod 16 is lifted to a horizontal state and locked with the second nut 24. After that, the length of the telescopic support rod 2 is controlled to adjust the height of the vibration connection mechanism 7, thereby adjusting the height of the metal sample, so that the middle of the metal sample abuts against the support head 17.

[0075] The vibration connection mechanism 7 is started to perform vertical reciprocating bending on the two ends of the metal sample, and the surface changes of the metal sample are recorded by the image collector 25 .

[0076] Start the first motor 74 to make the two clamping seats 76 vibrate up and down in the same direction. The support head 17 abuts against the middle of the metal sample to achieve vertical reciprocating tensile fatigue test on the metal sample, and the surface changes of the metal sample are recorded by the image collector 25.

[0077] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0078] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A metal material fatigue surface damage testing device, characterized in that: include: A base (1), wherein a lifting mechanism is arranged on the base (1), two sets of sliding plate assemblies are arranged on the lifting mechanism for horizontal sliding, and a spacing adjustment member is arranged between the two sliding plate assemblies; A vibration test assembly, comprising two sets of vibration connection mechanisms (7), wherein two ends of a metal sample are respectively connected to the two vibration connection mechanisms (7), wherein the two vibration connection mechanisms (7) are respectively arranged on the two sliding plate assemblies via angle adjustment assemblies, wherein the angle adjustment assemblies are used to adjust the vibration connection mechanisms (7) to be in a horizontal state or a vertical state, and further comprising a tiltable bottom support rod, wherein when the two vibration connection mechanisms (7) are in a vertical state, the bottom support rod is adjusted to a vertical state; An image collector (25), wherein the image collector (25) is used to collect an image of the surface of a metal sample.

2. A metal material fatigue surface damage testing device according to claim 1, characterized in that: The sliding plate assembly comprises a vertical connecting plate (5), the top and bottom of the vertical connecting plate (5) are respectively fixedly connected with a sliding plate (4), the vertical connecting plate (5) is slidably connected to the lifting mechanism via the two sliding plates (4), and the two angle adjustment assemblies are respectively arranged on the same side of the two vertical connecting plates (5).

3. A metal material fatigue surface damage testing device according to claim 2, characterized in that: The angle adjustment assembly comprises a connecting plate (20) and an arc-shaped sliding groove (6) extending through the side wall of the vertical connecting plate (5); one end of the connecting plate (20) is hinged on the side wall of the vertical connecting plate (5); a locking member is provided on the side wall of the connecting plate (20) close to the vertical connecting plate (5); the locking member is slidably connected in the arc-shaped sliding groove (6); and the locking member is used to lock the connecting plate (20) in a vertical state or a horizontal state.

4. A metal material fatigue surface damage testing device according to claim 3, characterized in that: The locking member comprises a first sliding groove (21) provided on a side wall of the connecting plate (20) close to the vertical connecting plate (5), a first fixing bolt (18) being slidably connected in the first sliding groove (21), the first fixing bolt (18) being slidably connected in the arc-shaped sliding groove (6), a first nut (19) being threadedly connected on the first fixing bolt (18), and the first nut (19) being in contact with a side wall of the vertical connecting plate (5) away from the connecting plate (20); Both ends of the arc-shaped sliding groove (6) are respectively connected to the limiting grooves (8); when the connecting plate (20) is in a horizontal state or a vertical state, the first nut (19) is located in one of the limiting grooves (8).

5. The metal material fatigue surface damage testing device according to claim 3, characterized in that: The vibration connection mechanism (7) comprises a shell (71), wherein the shell (71) is fixedly connected to the connection plate (20), a slide rod (75) is slidably connected inside the shell (71), one end of the slide rod (75) is fixedly connected to a clamping seat (76), the clamping seat (76) is located outside the shell (71) and is used to clamp a metal sample, one end of the slide rod (75) away from the clamping seat (76) is hinged to one end of a connecting rod (73), a turntable (72) is rotatably connected inside the shell (71), an edge of the turntable (72) is hinged to the other end of the connecting rod (73), a first motor (74) is fixedly connected inside the shell (71), and the first motor (74) is transmission-connected to the turntable (72).

6. The metal material fatigue surface damage testing device according to claim 2, characterized in that: The lifting mechanism comprises a plurality of connecting rods (13), the slide plate (4) is slidably connected to the connecting rods (13), both ends of the connecting rods (13) are respectively fixedly connected with connecting seats (3), the connecting seats (3) are located on the outside of the vertical connecting plate (5), a telescopic support rod (2) is vertically fixedly connected between two connecting seats (3) located on the same side of the vertical connecting plate (5), and the bottom of the telescopic support rod (2) is fixedly connected to the top of the base (1).

7. The metal material fatigue surface damage testing device according to claim 2, characterized in that: The spacing adjustment member comprises a threaded seat (9) and a fixed seat (11), wherein the threaded seat (9) is fixedly connected to the top of the slide plate (4) at the top of one of the vertical connecting plates (5), and the fixed seat (11) is fixedly connected to the top of the slide plate (4) at the top of another of the vertical connecting plates (5), a second motor (12) is horizontally fixedly connected in the fixed seat (11), a screw rod (10) is horizontally threadedly connected in the threaded seat (9), and one end of the screw rod (10) is drivingly connected to the second motor (12).

8. The metal material fatigue surface damage testing device according to claim 6, characterized in that: The image collector (25) is fixedly connected to the middle part of the connecting rod (13).

9. The metal material fatigue surface damage testing device according to claim 1, characterized in that: The bottom support rod comprises an articulated seat (15) fixedly connected to the center of the top of the base (1), one end of a support rod (16) is hinged in the articulated seat (15), the other end of the support rod (16) is fixedly connected to a support head (17), and a position locking member is provided between the support rod (16) and the articulated seat (15), and the position locking member is used to keep the support rod (16) in a vertical state.

10. A metal material fatigue surface damage testing method, based on the metal material fatigue surface damage testing device according to claim 1, characterized in that: The steps include: For horizontal tensile fatigue testing: The two vibration connection mechanisms (7) are respectively adjusted to a horizontal state through two angle adjustment components; Placing the metal sample between the two vibration connection mechanisms (7), and adjusting the distance between the two vibration connection mechanisms (7) by means of a spacing adjustment member, so that both ends of the metal sample are connected to the two vibration connection mechanisms (7) respectively; Starting the vibration connection mechanism (7) to horizontally stretch the two ends of the metal sample, and recording the surface changes of the metal sample through the image acquisition device (25); For vertical bending fatigue test: The two vibration connection mechanisms (7) are respectively adjusted to a vertical state through two angle adjustment components, and the bottom support rod is adjusted to a vertical state; The metal sample is placed between the two vibration connection mechanisms (7), the distance between the two vibration connection mechanisms (7) is adjusted by a spacing adjustment member so that both ends of the metal sample are respectively connected to the two vibration connection mechanisms (7), and the height of the vibration connection mechanisms (7) is adjusted by a lifting mechanism so that the middle of the metal sample abuts against the top of the bottom support rod; The vibration connection mechanism (7) is started to perform vertical reciprocating bending on the two ends of the metal sample, and the surface changes of the metal sample are recorded by an image collector (25).

Images