Metal fatigue test device and test method thereof

Abstract

The invention relates to the technical field of metal fatigue tests, and discloses a metal fatigue test device and a test method thereof.The metal fatigue test device comprises a bottom plate, a moving groove is formed in the middle of the top of the bottom plate, and a first moving base capable of moving in the X axis is arranged at the left end of the interior of the moving groove; a second moving base capable of moving in the X axis is arranged at the right end in the moving groove, a moving plate capable of moving in the Y axis is arranged at the top of the second moving base, clamping assemblies are fixedly installed at the top of the moving plate and the top of the first moving base, and the top of the first moving base and the top of the moving plate are located at the same horizontal height. According to the metal fatigue testing device, different metal fatigue tests can be carried out on a to-be-tested metal plate through different testing methods, the metal plates of different sizes can be tested, operation is easy and convenient, and the efficiency of the metal fatigue tests can be greatly improved.

Description

Technical Field

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

[0002] Metal fatigue test refers to determining the σ-1 of metal materials through metal material experiments, drawing the SN curve of the material, and then observing the fatigue failure phenomenon and fracture characteristics, and then learning the method of determining the fatigue limit of metal materials under symmetrical cycles. There are many types of metal fatigue tests. When performing metal fatigue tests on metal plates, common equipment is not convenient for performing multiple metal fatigue tests on metal plates. Multiple devices are required to complete different metal fatigue tests, which greatly reduces the efficiency of the experiment and increases the cost required for the experiment. For this reason, this application proposes a metal fatigue test device and a test method thereof. Summary of the invention

[0003] In order to solve the problems raised in the above-mentioned background technology, the present invention provides the following technical solutions: a metal fatigue testing device, comprising a base plate, a movable groove is opened in the middle position of the top of the base plate, a first movable base movable in the X-axis is arranged at the left end inside the movable groove, a second movable base movable in the X-axis is arranged at the right end inside the movable groove, a movable plate movable in the Y-axis is arranged on the top of the second movable base, a clamping assembly is fixedly installed on the top of the movable plate and the top of the first movable base, the top of the first movable base and the top of the movable plate are located at the same horizontal height, and a pressing mechanism is fixedly installed on the top of the base plate and in the middle position on one side of the movable groove.

[0004] Furthermore, the clamping assembly includes two fixed seats, two clamping blocks and two fifth hydraulic rods. The two fixed seats are symmetrically distributed on the top of the movable plate. Storage grooves are provided at the bottom of the corners of one end of the two fixed seats. The two clamping blocks are respectively located in the storage grooves on the two fixed seats. Inner grooves are provided inside the two fixed seats. Fifth hydraulic rods are fixedly installed in the two inner grooves. The telescopic ends of the two fifth hydraulic rods extend into the corresponding storage grooves and are fixedly connected to the two clamping blocks. The inner sides of the storage grooves and the inner sides of the clamping blocks are set to inclined surfaces with the same inclination. When the two fifth hydraulic rods push the corresponding clamping blocks to move outside the storage grooves, the sides of the two clamping blocks away from the inclined surfaces will gradually approach each other.

[0005] Furthermore, a slot is provided at one end of each clamping block located in the storage groove, an insertion rod is fixedly installed in the storage groove, and each insertion rod is movably inserted into the slot at one end of the corresponding clamping block, each insertion rod and the corresponding slot are set to an inclined state, and the inclination of the insertion rod and the slot is the same as the inclination of the corresponding fifth hydraulic rod, the inner side of the storage groove and the inner side of the clamping block.

[0006] Furthermore, two Y-axis guide rods are fixedly installed on the top of the second mobile base. Both guide rods are movable and inserted into the mobile plate. A first hydraulic rod is fixedly installed on the top of the second mobile base. The telescopic end of the first hydraulic rod is fixedly connected to the middle position of one end of the mobile plate.

[0007] Furthermore, the pressing mechanism includes a fixed block, a push rod, a pressure block, a rotating plate and a motor, a first rod groove is provided on the top of the fixed block, the push rod is movably inserted in the first rod groove, a second rod groove is provided at the bottom end of the push rod, a fourth hydraulic rod is fixedly installed in the second rod groove, the cross-section of the pressure block is an isosceles triangle shape, the tip of the pressure block is vertically downward, and the pressure block is fixedly installed on the output end of the fourth hydraulic rod, a third fixed shaft is fixedly installed on the outer wall of the fixed block, a rotating plate is rotatably installed on the third fixed shaft, and a second fixed shaft is fixedly installed on the side of the rotating plate, a notch connected to the first rod groove is provided on the side wall of the fixed block, a connecting rod is fixedly installed on the outer wall of the push rod, the connecting rod is inserted through the notch, and the first fixed shaft is fixedly installed at one end of the connecting rod extending out of the notch, a linkage rod is movably installed between the first fixed shaft and the second fixed shaft, a motor is fixedly installed on one side of the fixed block, a gear is fixedly installed on the output end of the motor, a tooth groove is provided on the side wall of the rotating plate, and the side wall of the gear extends into the tooth groove and is meshed with it.

[0008] Furthermore, both ends of the linkage rod are rotatably connected to the first fixed shaft and the second fixed shaft respectively, a groove is opened at the center of the side of the rotating plate near the fixed block, a bearing is fixedly installed in the groove, the inner ring wall of the bearing is fixedly connected to the third fixed shaft, the second fixed shaft is not at the center of the circle of the side of the rotating plate, and the height difference generated by the second fixed shaft when the rotating plate rotates is the same as the movable distance of the connecting rod in the groove.

[0009] Furthermore, both sides of the inner wall of the first rod groove are provided with sliding grooves, and both sides of the outer wall of the top rod are fixedly installed with sliding blocks, and the two sliding blocks are respectively located in the sliding grooves on both sides of the inner wall of the first rod groove and can slide therein.

[0010] Furthermore, through holes are provided at both ends of the side surfaces of the first movable base and the second movable base, and two X-axis positioning rods are fixedly installed in the movable groove, and the two positioning rods respectively penetrate and are movably inserted into the through holes at both ends of the side surfaces of the first movable base and the second movable base, a second hydraulic rod is fixedly installed at the left end of the base plate, and the telescopic end of the second hydraulic rod extends into the movable groove and is fixedly connected to the first movable base, and a third hydraulic rod is fixedly installed at the right end of the base plate, and the telescopic end of the third hydraulic rod extends into the movable groove and is fixedly connected to the second movable base.

[0011] Another aspect of the present invention provides a metal fatigue testing device and a testing method thereof, comprising the following steps:

[0012] S1: adjusting the positions of the first movable base and the second movable base according to the length of the metal plate to be measured;

[0013] S2: Place the two ends of the metal plate to be tested between two clamping components and clamp and fix the two ends;

[0014] S3: By controlling the movement of the first movable base or the second movable base, a tensile fatigue test can be performed on the metal plate to be tested;

[0015] By controlling the first hydraulic rod on the second movable base to push the movable plate to repeatedly move along the direction of the guide rod, the metal plate to be tested can be repeatedly bent and tested;

[0016] The fourth hydraulic rod is controlled to push the pressure block against the metal plate to be tested, and then the motor is operated to make the gear at its output end mesh and rotate with the tooth groove of the side wall of the rotating plate, so that the rotating plate rotates around the third fixed axis, and then the push rod is driven to move up and down repeatedly in the first rod groove through the linkage rod, so that the pressure block can perform fatigue test of repeatedly pressing down on the metal plate to be tested.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The clamping assembly can be used to fix and clamp metal sheets of different sizes, and the clamping stability is high, so that the metal sheets will not loosen during the technical fatigue test. Different metal fatigue tests can be performed on the metal sheets to be tested by using different test methods, thereby greatly improving the efficiency of fatigue testing on metal sheets. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of the structure of the present invention as a whole from a top view;

[0021] Figure 2 It is a structural schematic diagram of the connection between the moving plate and the clamping assembly of the present invention;

[0022] Figure 3 It is a schematic cross-sectional structure diagram of the clamping assembly of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the fixing seat of the present invention;

[0024] Figure 5 It is a schematic diagram of a cross-sectional structure of a part of the side of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the pressing mechanism of the present invention;

[0026] Figure 7 It is a schematic cross-sectional structure diagram of the connection between the fixing block and the ejector rod of the present invention;

[0027] Figure 8 It is a schematic cross-sectional structure diagram of the connection between the connecting rod and the rotating plate of the present invention;

[0028] Fig. 9 It is a structural schematic diagram of the connection between the motor and the rotating plate of the present invention;

[0029] In the figure: 1, bottom plate; 2, moving groove; 3, positioning rod; 4, first moving base; 5, second moving base; 6, guide rod; 7, moving plate; 8, first hydraulic rod; 9, clamping assembly; 10, second hydraulic rod; 11, third hydraulic rod; 12, fixed block; 13, first rod groove; 14, top rod; 15, second rod groove; 16, fourth hydraulic rod; 17, pressure block; 18, slide groove; 19, slider; 20, notch; 21, connecting rod; 22, first fixed axis; 23, rotating plate; 24, bearing; 25, second fixed axis; 26, linkage rod; 27, motor; 28, gear; 91, fixed seat; 92, storage groove; 93, clamping block; 94, inner groove; 95, fifth hydraulic rod; 96, slot; 97, plug rod. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] Depend on Figure 1-9 The present invention includes a bottom plate 1, a movable groove 2 is opened at the middle position of the top of the bottom plate 1, a first movable base 4 movable in the X-axis is arranged at the left end inside the movable groove 2, a second movable base 5 movable in the X-axis is arranged at the right end inside the movable groove 2, a movable plate 7 movable in the Y-axis is arranged on the top of the second movable base 5, a clamping assembly 9 is fixedly installed on the top of the movable plate 7 and the top of the first movable base 4, the top of the first movable base 4 and the top of the movable plate 7 are located at the same horizontal height, and a pressing mechanism is fixedly installed on the top of the bottom plate 1 and at the middle position on one side of the movable groove 2.

[0032] At the same time, the clamping assembly 9 includes two fixed seats 91, two clamping blocks 93 and two fifth hydraulic rods 95. The two fixed seats 91 are symmetrically distributed on the top of the movable plate 7. A storage groove 92 is provided at the bottom of the corner of one end of the two fixed seats 91. The two clamping blocks 93 are respectively located in the storage grooves 92 on the two fixed seats 91. An inner groove 94 is provided inside the two fixed seats 91. The fifth hydraulic rods 95 are fixedly installed in the two inner grooves 94. The telescopic ends of the two fifth hydraulic rods 95 extend to the opposite sides. The two clamping blocks 93 are placed in the corresponding storage groove 92 and fixedly connected with the two clamping blocks 93. The inner sides of the storage groove 92 and the inner sides of the clamping blocks 93 are both set as inclined surfaces with the same slope. When the two fifth hydraulic rods 95 push the corresponding clamping blocks 93 to move out of the storage groove 92, the sides of the two clamping blocks 93 away from the inclined surfaces will gradually approach each other. Under the pushing action of the fifth hydraulic rod 95, the clamping blocks 93 will move outward along the direction of the insertion rod 97 in the storage groove 92, and finally the two clamping blocks 93 in the clamping assembly 9 will complete the fixed clamping of the metal sheet.

[0033] In addition, a slot 96 is provided at one end of each clamping block 93 located in the storage groove 92, and an insertion rod 97 is fixedly installed in the storage groove 92, and each insertion rod 97 is movably inserted in the slot 96 at one end of the corresponding clamping block 93, and each insertion rod 97 and the corresponding slot 96 are set to an inclined state, and the inclination of the insertion rod 97 and the slot 96 is the same as the inclination of the corresponding fifth hydraulic rod 95, the inner side of the storage groove 92 and the inner side of the clamping block 93. Through the cooperation of the insertion rod 97 and the slot 96, the clamping block 93 can be moved more stably when it is moved outside the storage groove 92.

[0034] In addition, two guide rods 6 in the Y-axis direction are fixedly installed on the top of the second mobile base 5. The two guide rods 6 are movable and inserted into the mobile plate 7. A first hydraulic rod 8 is fixedly installed on the top of the second mobile base 5. The telescopic end of the first hydraulic rod 8 is fixedly connected to the middle position of one end of the mobile plate 7. The guide rod 6 can enable the mobile plate 7 to move more stably in the Y-axis direction on the second mobile base 5.

[0035] And, the pressing mechanism includes a fixed block 12, a push rod 14, a pressure block 17, a rotating plate 23 and a motor 27. A first rod groove 13 is provided on the top of the fixed block 12, and the push rod 14 is movably inserted in the first rod groove 13. A second rod groove 15 is provided at the bottom end of the push rod 14. A fourth hydraulic rod 16 is fixedly installed in the second rod groove 15. The cross section of the pressure block 17 is an isosceles triangle shape. The tip of the pressure block 17 is vertically downward, and the pressure block 17 is fixedly installed on the output end of the fourth hydraulic rod 16. A third fixed shaft is fixedly installed on the outer wall of the fixed block 12, and a rotating plate 23 is rotatably installed on the third fixed shaft. A second fixed shaft 25 is fixedly installed on the side of the rotating plate 23. The fixed block 12 A slot 20 communicating with the first rod slot 13 is provided on the side wall of the top rod 14, a connecting rod 21 is fixedly installed on the outer wall of the top rod 14, the connecting rod 21 penetrates and is inserted into the slot 20, and a first fixed shaft 22 is fixedly installed on the end of the connecting rod 21 extending out of the slot 20, a linkage rod 26 is movably installed between the first fixed shaft 22 and the second fixed shaft 25, a motor 27 is fixedly installed on one side of the fixed block 12, a gear 28 is fixedly installed on the output end of the motor 27, a tooth groove is provided on the side wall of the rotating plate 23, and the side wall of the gear 28 extends into the tooth groove and is meshed with it, and under the continuous and repeated downward pressure of the tip of the bottom of the pressing block 17, the metal fatigue test of the metal sheet pressing can be completed.

[0036] In addition, both ends of the linkage rod 26 are rotatably connected to the first fixed shaft 22 and the second fixed shaft 25 respectively. A groove is opened at the center of the side of the rotating plate 23 near the fixed block 12, and a bearing 24 is fixedly installed in the groove. The inner ring wall of the bearing 24 is fixedly connected to the third fixed shaft. The second fixed shaft 25 is not at the center of the circle of the side of the rotating plate 23, and the height difference generated by the second fixed shaft 25 when the rotating plate 23 rotates is the same as the movable distance of the connecting rod 21 in the groove 20. When the rotating plate 23 rotates, the connecting rod 21 can be driven to move up and down repeatedly in the groove 20 through the linkage rod 26, thereby driving the top rod 14 to move up and down repeatedly in the first rod groove 13.

[0037] In addition, sliding grooves 18 are provided on both sides of the inner wall of the first rod groove 13, and sliding blocks 19 are fixedly installed on both sides of the outer wall of the push rod 14. The two sliding blocks 19 are respectively located in the sliding grooves 18 on both sides of the inner wall of the first rod groove 13 and can slide therein. Through the cooperation of the sliding blocks 19 and the sliding grooves 18, the push rod 14 can be more stable when moving in the first rod groove 13.

[0038] In addition, through holes are provided at both ends of the side surfaces of the first movable base 4 and the second movable base 5, and two X-axis positioning rods 3 are fixedly installed in the movable groove 2, and the two positioning rods 3 respectively penetrate and are movably inserted into the through holes at both ends of the side surfaces of the first movable base 4 and the second movable base 5, and a second hydraulic rod 10 is fixedly installed at the left end of the base plate 1, and the telescopic end of the second hydraulic rod 10 extends into the movable groove 2 and is fixedly connected to the first movable base 4, and a third hydraulic rod 11 is fixedly installed at the right end of the base plate 1, and the telescopic end of the third hydraulic rod 11 extends into the movable groove 2 and is fixedly connected to the second movable base 5. The positioning rod 3 can make the first movable base 4 and the second movable base 5 more stable when moving left and right in the movable groove 2.

[0039] Directions:

[0040] S1: adjusting the positions of the first movable base 4 and the second movable base 5 according to the length of the metal plate to be measured;

[0041] S2: placing the two ends of the metal plate to be tested between the two clamping assemblies 9 and clamping and fixing the two ends;

[0042] S3: By controlling the movement of the first movable base 4 or the second movable base 5, a tensile fatigue test can be performed on the metal plate to be tested;

[0043] By controlling the first hydraulic rod 8 on the second movable base 5 to push the movable plate 7 to repeatedly move along the direction of the guide rod 6, the metal plate to be tested can be repeatedly bent and tested;

[0044] By controlling the fourth hydraulic rod 16 to push the pressure block 17 against the metal plate to be tested, and then operating the motor 27 to make the gear 28 at its output end mesh and rotate with the tooth groove of the side wall of the rotating plate 23, so that the rotating plate 23 rotates around the third fixed axis, and then the linkage rod 26 drives the push rod 14 to move up and down repeatedly in the first rod groove 13, so that the pressure block 17 can perform fatigue test of repeatedly pressing down on the metal plate to be tested.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal fatigue testing device and a testing method thereof, comprising a base plate (1), characterized in that: A movable groove (2) is provided at the middle position of the top of the bottom plate (1); a first movable base (4) movable along the X-axis is provided at the left end inside the movable groove (2); a second movable base (5) movable along the X-axis is provided at the right end inside the movable groove (2); a movable plate (7) movable along the Y-axis is provided at the top of the second movable base (5); a clamping assembly (9) is fixedly installed at the top of the movable plate (7) and the top of the first movable base (4); the top of the first movable base (4) and the top of the movable plate (7) are located at the same horizontal height; a pressing mechanism is fixedly installed at the top of the bottom plate (1) and at the middle position on one side of the movable groove (2).

2. A metal fatigue testing device and a testing method thereof according to claim 1, characterized in that: The clamping assembly (9) comprises two fixed seats (91), two clamping blocks (93) and two fifth hydraulic rods (95). The two fixed seats (91) are symmetrically distributed on the top of the movable plate (7). A storage groove (92) is provided at the bottom of the corner of one end of the two fixed seats (91). The two clamping blocks (93) are respectively located in the storage grooves (92) on the two fixed seats (91). An inner groove (94) is provided inside the two fixed seats (91). The two inner grooves ( 94), the telescopic ends of the two fifth hydraulic rods (95) extend into the corresponding storage grooves (92) and are fixedly connected to the two clamping blocks (93), the inner sides of the storage grooves (92) and the inner sides of the clamping blocks (93) are both arranged as inclined surfaces with the same inclination, and when the two fifth hydraulic rods (95) push the corresponding clamping blocks (93) to move out of the storage grooves (92), the sides of the two clamping blocks (93) away from the inclined surfaces will gradually approach each other.

3. A metal fatigue testing device and a testing method thereof according to claim 2, characterized in that: A slot (96) is provided at one end of each clamping block (93) located in the storage groove (92), and an insertion rod (97) is fixedly installed in the storage groove (92), and each insertion rod (97) is movably inserted into the slot (96) at one end of the corresponding clamping block (93), and each insertion rod (97) and the corresponding slot (96) are arranged in an inclined state, and the inclination of the insertion rod (97) and the slot (96) is the same as the inclination of the corresponding fifth hydraulic rod (95), the inner side of the storage groove (92) and the inner side of the clamping block (93).

4. A metal fatigue testing device and a testing method thereof according to claim 1, characterized in that: Two guide rods (6) in the Y-axis direction are fixedly installed on the top of the second movable base (5), and the two guide rods (6) are movable and inserted into the movable plate (7). A first hydraulic rod (8) is fixedly installed on the top of the second movable base (5), and the telescopic end of the first hydraulic rod (8) is fixedly connected to the middle position of one end of the movable plate (7).

5. A metal fatigue testing device and testing method according to claim 1, characterized in that: The pressing mechanism comprises a fixed block (12), a push rod (14), a pressure block (17), a rotating plate (23) and a motor (27); a first rod groove (13) is provided on the top of the fixed block (12); the push rod (14) is movably inserted in the first rod groove (13); a second rod groove (15) is provided at the bottom end of the push rod (14); a fourth hydraulic rod (16) is fixedly installed in the second rod groove (15); the cross section of the pressure block (17) is an isosceles triangle shape; the tip of the pressure block (17) is vertically downward; and the pressure block (17) is fixedly installed on the output end of the fourth hydraulic rod (16); a third fixed shaft is fixedly installed on the outer wall of the fixed block (12); a rotating plate (23) is rotatably installed on the third fixed shaft; and the side of the rotating plate (23) A second fixed shaft (25) is fixedly installed, a notch (20) connected to the first rod groove (13) is opened on the side wall of the fixed block (12), a connecting rod (21) is fixedly installed on the outer wall of the top rod (14), the connecting rod (21) penetrates and is inserted in the notch (20), and a first fixed shaft (22) is fixedly installed at one end of the connecting rod (21) extending out of the notch (20), a linkage rod (26) is movably installed between the first fixed shaft (22) and the second fixed shaft (25), a motor (27) is fixedly installed on one side of the fixed block (12), a gear (28) is fixedly installed at the output end of the motor (27), a tooth groove is opened on the side wall of the rotating plate (23), and the side wall of the gear (28) extends into the tooth groove and is meshed with it.

6. A metal fatigue testing device and testing method according to claim 5, characterized in that: The two ends of the linkage rod (26) are rotatably connected to the first fixed shaft (22) and the second fixed shaft (25), respectively; a groove is provided at the center of the side surface of the rotating plate (23) close to the fixed block (12); a bearing (24) is fixedly installed in the groove; the inner wall of the bearing (24) is fixedly connected to the third fixed shaft; the second fixed shaft (25) is not at the center of the side surface of the rotating plate (23); and the height difference generated by the second fixed shaft (25) when the rotating plate (23) rotates is the same as the movable distance of the connecting rod (21) in the slot (20).

7. A metal fatigue testing device and testing method according to claim 5, characterized in that: Slide grooves (18) are provided on both sides of the inner wall of the first rod groove (13), and sliding blocks (19) are fixedly installed on both sides of the outer wall of the push rod (14). The two sliding blocks (19) are respectively located in the slide grooves (18) on both sides of the inner wall of the first rod groove (13) and can slide therein.

8. A metal fatigue testing device and testing method according to claim 1, characterized in that: Through holes are provided at both ends of the side surfaces of the first movable base (4) and the second movable base (5); two X-axis positioning rods (3) are fixedly installed in the movable groove (2), and the two positioning rods (3) respectively penetrate and are movably inserted into the through holes at both ends of the side surfaces of the first movable base (4) and the second movable base (5); a second hydraulic rod (10) is fixedly installed at the left end of the base plate (1); the telescopic end of the second hydraulic rod (10) extends into the movable groove (2) and is fixedly connected to the first movable base (4); a third hydraulic rod (11) is fixedly installed at the right end of the base plate (1); the telescopic end of the third hydraulic rod (11) extends into the movable groove (2) and is fixedly connected to the second movable base (5).

9. A testing method for a metal fatigue testing device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: adjusting the positions of the first movable base (4) and the second movable base (5) according to the length of the metal plate to be measured; S2: placing the two ends of the metal plate to be tested between two clamping assemblies (9) and clamping and fixing the two ends; S3: By controlling the movement of the first movable base (4) or the second movable base (5), a tensile fatigue test can be performed on the metal plate to be tested; By controlling the first hydraulic rod (8) on the second movable base (5) to push the movable plate (7) to repeatedly move along the direction of the guide rod (6), the metal plate to be tested can be repeatedly bent and tested; The fourth hydraulic rod (16) is controlled to push the pressing block (17) against the metal plate to be tested, and then the motor (27) is operated to mesh the gear (28) at the output end with the tooth groove of the side wall of the rotating plate (23) to rotate, so that the rotating plate (23) rotates around the third fixed axis, and then the push rod (14) is driven to move up and down repeatedly in the first rod groove (13) through the linkage rod (26), so that the pressing block (17) can perform fatigue test of repeatedly pressing down on the metal plate to be tested.

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