Steel plate fatigue test clamp for automobile chassis

Abstract

The utility model relates to a steel plate fatigue test fixture for an automobile chassis, which comprises an upper base and a lower base, each base is respectively provided with a clamping block group, each clamping block group comprises two clamping blocks, a clamping gap is formed between the two clamping blocks, the upper base and the lower base are respectively provided with an upper adjusting table and a lower adjusting table, and the upper adjusting table and the lower adjusting table are connected with each other. Each adjusting table can move back and forth in the vertical direction relative to the corresponding base, the two clamping blocks in each clamping block set can move up and down relative to the corresponding base, in the initial state, the upper adjusting table is located at the lowest position, the lower adjusting table is located at the highest position, and the width of the clamping gap of each clamping block set is the largest. When the upper adjusting table moves upwards to drive the two corresponding clamping blocks to move upwards synchronously, the width of the clamping gap of the clamping block set is reduced, the lower adjusting table moves downwards to drive the two corresponding clamping blocks to move downwards synchronously, and the width of the clamping gap of the clamping block set is reduced. The sample clamping device can stably clamp a sample, is suitable for samples with different thickness specifications, and is good in universality.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of fatigue test, especially to a steel plate fatigue test fixture for automobile chassis. BACKGROUND

[0002] Metal plate parts are widely used in the automobile, machinery, electrical, building and other equipment manufacturing and engineering construction industries, in addition, many metal plate parts are important load-bearing structural parts, and their mechanical properties and fatigue properties have an important influence on the overall performance of equipment or engineering. Further, the fatigue strength is an important performance indicator of the part, and the fatigue strength of the part is generally tested by fatigue test. For example, the elastomer testing machine is mainly used for the fatigue performance of rubber elastomer parts, such as the Chinese utility model patent with the patent number ZL202220903554.2 (the authorized announcement number is CN217638353U), the Chinese invention patent with the patent number ZL201610944858.2 (the authorized announcement number is CN106525398B) and the like. The vibration test bench is mainly used for the resonance fatigue performance test of finished parts, such as the Chinese invention patent with the patent number ZL201480029338.8 (the authorized announcement number is CN105593661B), the Chinese patent with the patent number 202010512199.1 (the authorized announcement number is CN111649926B) and the like.

[0003] However, there is no device specially used for metal plate fatigue performance test at present, and the key reason is that there is no clamp suitable for metal plate clamping. When fatigue testing of a certain metal plate is carried out, a special clamp is generally designed to test the fatigue of the metal plate on the traditional fatigue testing machine, and the existing special clamp is not only not firm, but also only suitable for one kind of metal plate, and cannot be applied to other metal plates, so the universality is poor. SUMMARY

[0004] The utility model provides a kind of steel plate fatigue test fixture for automobile chassis with firm clamping and good universality to the technical problems to be solved by the prior art.

[0005] The technical scheme adopted by the utility model to solve the above technical problems is as follows: a kind of steel plate fatigue test fixture for automobile chassis, characterized by including upper base and lower base being arranged at the lower side of the upper base, each base is provided with clamping block group, each clamping block group includes two clamping blocks arranged side by side, and a vertical clamping gap is formed between the two clamping blocks,

[0006] Under the sample loading state, the sample extends vertically, and the upper and lower ends of the sample are clamped in the corresponding clamping gap,

[0007] And, the upper base is further provided with an upper adjusting platform, and the lower base is further provided with a lower adjusting platform located directly below the upper adjusting platform, each adjusting platform can move up and down relative to the base, and the two clamping blocks in each clamping block group can move up and down relative to the base,

[0008] And, in the initial state, the upper adjusting platform is located at the lowest position and the lower adjusting platform is located at the highest position, and the width of the clamping gap of each clamping block group is the largest, when the upper adjusting platform moves up and drives the clamping blocks of the clamping block group on the upper base to move up synchronously, the width of the clamping gap of the clamping block group on the upper base is reduced, at the same time, the lower adjusting platform moves down and drives the clamping blocks of the clamping block group on the lower base to move down synchronously, and the width of the clamping gap of the clamping block group on the lower base is reduced.

[0009] Further, the upper base comprises left and right upper vertical walls, and the lower base comprises left and right lower vertical walls, each vertical wall is provided with a sliding groove corresponding to the clamping block on the base, each sliding groove is an elongated hole extending upward and downward, wherein the two sliding grooves on the upper vertical wall are opposite to each other and the distance between them increases from top to bottom, and the two sliding grooves on the lower vertical wall are opposite to each other and the distance between them decreases from top to bottom, and each clamping block is provided with a sliding block corresponding to the sliding groove, each sliding block is embedded in the corresponding sliding groove and can move back and forth along the length direction of the sliding groove. Thus, the up and down movement of each clamping block relative to the base can be realized, and the distance between the two clamping blocks in each clamping block group can be changed by the synchronous up and down movement of the two clamping blocks, thereby realizing the adjustment of the size of each clamping gap according to the width of the sample.

[0010] Further, each clamping block group is located on the front side of the corresponding vertical wall, and each sliding block is protruded on the back of the corresponding clamping block, each sliding block extends forward and backward and has an elongated cross section, and the width of each sliding block matches the width of the corresponding sliding groove, and the angle between each sliding block and the vertical direction is the same as the angle between the corresponding sliding groove and the vertical direction. Thus, the up and down movement of each clamping block can be realized smoothly, which is beneficial to ensure the reliability of the size adjustment of each clamping gap.

[0011] Further, the front surface of each vertical wall is provided with a vertically extending guide strip, and each adjusting platform is recessed with a vertically extending guide groove, each guide strip is embedded in the corresponding guide groove, so that each adjusting platform can move back and forth along the corresponding guide strip. Thus, the up and down movement of each adjusting platform can be realized smoothly, which is beneficial to the synchronous up and down movement of the two clamping blocks in each clamping block group driven by the corresponding adjusting platform.

[0012] Further, the shape of the upper base is inverted L-shaped, and the shape of the lower base is L-shaped, the upper base further comprises an upper horizontal wall above the upper vertical wall, and the lower base further comprises a lower horizontal wall below the lower vertical wall,

[0013] The upper horizontal wall is provided with an upper mounting hole, and the lower horizontal wall is provided with a lower mounting hole. The upper adjusting platform is vertically provided with a first screw hole, and the lower adjusting platform is vertically provided with a second screw hole. The first mounting bolt is sequentially threaded through the upper mounting hole and the first screw hole from top to bottom and fastened by a nut, and the second mounting bolt is sequentially threaded through the lower mounting hole and the second screw hole from bottom to top and fastened by a nut. When the adjusting platform is moved to the required position, the adjusting platform is locked by the corresponding mounting bolt, so that the adjusting platform is stably positioned at the required height, and the clamping block group is stably positioned at the required height, so that the clamping gap is stably maintained at the required size.

[0014] Further, the upper adjusting platform is in the shape of a U, which is arranged along the left-right direction, and the two ends are respectively provided with the first screw hole, so that the upper adjusting platform can be stably mounted on the upper base,

[0015] The clamping block group on the upper base is accommodated in the upper accommodating groove of the upper adjusting platform. The front end of the bottom wall of the upper adjusting platform is concave in the middle along the length direction and is provided with an upper buckle slot penetrating upward and downward. The front inner side of the bottom surface of each clamping block on the upper base is respectively provided with an upper buckle block. The two upper buckle blocks are left-right spliced and embedded in the upper buckle slot. The inner bottom surface of the upper adjusting platform and the bottom surface of the clamping block group on the upper base are always upward and downward abutted, so that the corresponding clamping block group and the upper adjusting platform are stably arranged on the upper base, and the upward movement of the upper adjusting platform can reliably drive the upward movement of the corresponding clamping block group,

[0016] Meanwhile, the lower adjusting platform is in the shape of an inverted U, which is arranged along the left-right direction, and the two ends are respectively provided with the second screw hole, so that the lower adjusting platform can be stably mounted on the lower base,

[0017] The clamping block group on the lower base is accommodated in the lower accommodating groove of the lower adjusting platform. The front end of the top wall of the lower adjusting platform is concave in the middle along the length direction and is provided with a lower buckle slot penetrating upward and downward. The front inner side of the top surface of each clamping block on the lower base is respectively provided with a lower buckle block. The two lower buckle blocks are left-right spliced and embedded in the lower buckle slot. The inner top surface of the lower adjusting platform and the top surface of the clamping block group on the lower base are always upward and downward abutted, so that the corresponding clamping block group and the lower adjusting platform are stably arranged on the lower base, and the downward movement of the lower adjusting platform can reliably drive the downward movement of the corresponding clamping block group.

[0018] Further, the longitudinal section of the upper accommodating groove in the upper adjusting platform is in the shape of an inverted isosceles trapezoid, and correspondingly, the longitudinal section of the clamping block group on the upper base is also in the shape of an inverted isosceles trapezoid. In the initial state, the clamping block group on the upper base is left-right abutted with the slot wall of the upper accommodating groove and the upper buckle slot,

[0019] And the longitudinal section of the lower container groove in the lower adjusting platform is isosceles trapezoidal, and the longitudinal section of the clamping block group on the lower base is also isosceles trapezoidal, and the clamping block group on the lower base is in abutment with the groove walls of the lower container groove and the lower buckle groove in the initial state. On the one hand, the cooperation of each clamping block group and the corresponding adjusting platform can make each clamping block group more stably maintain in the initial state, so that each clamping gap is kept maximum in the initial state, and on the other hand, the slider on each clamping block can more smoothly slide along the corresponding sliding groove, so that the size of each clamping gap can be better adjusted.

[0020] Further, the two clamping sides constituting the clamping gap in each clamping block group are respectively provided with anti-skid textures. This is favorable for stably clamping the sample and avoiding displacement of the sample in the test process.

[0021] Further, the anti-skid textures on each clamping side are anti-skid protrusions extending in the front-rear direction, which are spaced in the height direction of the clamping side, and each anti-skid protrusion is arranged by anti-skid protrusions spaced in the front-rear direction. Thus, the sample can be better prevented from displacement in the test process.

[0022] Further, a clamp for preventing buckling is clamped at the middle of the sample in the length direction. Thus, the sample is prevented from buckling deformation.

[0023] Compared with the prior art, the upper base and the lower base are respectively provided with clamping block groups, and each clamping block group is respectively provided with a clamping gap, and in the sample loading state, the upper and lower ends of the sample are clamped in the corresponding clamping gap, so that the sample is stably clamped, displacement of the sample in the test process is avoided, and the fatigue test is ensured to be smoothly performed.

[0024] And the upper base is provided with an upper adjusting platform and the lower base is provided with a lower adjusting platform, and in the initial state, the width of the clamping gap of each clamping block group is maximum, so as to put each end of the sample into the corresponding clamping gap, when the upper adjusting platform moves upward and drives each clamping block of the clamping block group on the upper base to move upward synchronously, the width of the clamping gap of the clamping block group is reduced, and at the same time, when the lower adjusting platform moves downward and drives each clamping block of the clamping block group on the lower base to move downward synchronously, the width of the clamping gap of the clamping block group is reduced.

[0025] In this way, the size of the clamping gap of each clamping block group can be adjusted according to the thickness of the sample, so that the utility model is applicable to samples of different thickness specifications, and the universality of the utility model is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic view of the clamp in the embodiment of the utility model;

[0027] Figure 2 As Figure 1 A structural schematic view in another direction;

[0028] Figure 3 As Figure 1 A structural schematic view in another direction;

[0029] Figure 4 As a partial structural exploded view of the clamp in the embodiment of the utility model;

[0030] Figure 5 As another partial structural exploded view of the clamp in the embodiment of the utility model;

[0031] Figure 6 As Figure 5 An enlarged view of part A. DETAILED DESCRIPTION

[0032] The utility model will be described in further detail below in combination with the embodiment of the drawings.

[0033] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, since the disclosed embodiments of the utility model can be arranged in different directions, so these orientation indicating terms are only as an illustration and should not be regarded as a limitation, for example, "upper", "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity. In addition, the features defined as "first", "second" can explicitly or implicitly include one or more features.

[0034] As Figures 1-6 As shown in the figure, a kind of automobile chassis steel sheet fatigue test fixture, including upper base 1 and lower base 2 being arranged in upper and lower interval at the lower side of the upper base 1 directly below it. Each base is respectively provided with clamp block group 3, each clamp block group 3 includes two clamp blocks 31 being arranged side by side, and the vertical extending clamping gap 30 is formed between the two clamp blocks 31. Under the loading state of test sample 4, the test sample 4 extends vertically, and the upper and lower ends of the test sample 4 are clamped in the corresponding clamping gap 30 respectively. The test sample 4 in the utility model is prepared from long strip-shaped steel sheet of automobile chassis steel sheet.

[0035] Further, the upper base 1 is further provided with an upper adjusting platform 51, and the lower base 2 is further provided with a lower adjusting platform 52 located directly below the upper adjusting platform 51, each adjusting platform can move up and down relative to the base, and the two clamping blocks 31 in each clamping block group 3 can move up and down relative to the base. And in the initial state, the upper adjusting platform 51 is located at the lowest position, and the lower adjusting platform 52 is located at the highest position, and the width of the clamping gap 30 of each clamping block group 3 is the largest, when the upper adjusting platform 51 moves up and synchronously drives the clamping blocks 31 of the clamping block group 3 of the upper base 1 to move up, the width of the clamping gap 30 of the clamping block group 3 of the upper base 1 is reduced, and at the same time, the lower adjusting platform 52 moves down and synchronously drives the clamping blocks 31 of the clamping block group 3 of the lower base 2 to move down, the width of the clamping gap 30 of the clamping block group 3 of the lower base 2 is reduced.

[0036] As can be seen from the above, the upper base 1 and the lower base 2 are respectively provided with a clamping block group 3, and each clamping block group 3 is respectively provided with a clamping gap 30. In the loaded state of the test sample 4, the upper and lower ends of the test sample 4 are clamped in the corresponding clamping gap 30, thereby realizing stable clamping of the test sample 4, avoiding displacement of the test sample 4 during the test process, and ensuring smooth progress of the fatigue test. And the upper base 1 is provided with an upper adjusting platform 51 and the lower base 2 is provided with a lower adjusting platform 52, in the initial state, the width of the clamping gap 30 of each clamping block group 3 is the largest, so as to put each end of the test sample 4 into the corresponding clamping gap 30, when the upper adjusting platform 51 moves up and synchronously drives the clamping blocks 31 of the clamping block group 3 of the upper base 1 to move up, the width of the clamping gap 30 of the clamping block group 3 is reduced, and at the same time, the lower adjusting platform 52 moves down and synchronously drives the clamping blocks 31 of the clamping block group 3 of the lower base 2 to move down, the width of the clamping gap 30 of the clamping block group 3 is reduced. In this way, the size of the clamping gap 30 of each clamping block group 3 can be adjusted according to the thickness of the test sample 4, so that the utility model is applicable to test samples 4 of different thickness specifications, and the versatility of the utility model is improved.

[0037] Further, the upper base 1 comprises left and right upper vertical walls 11, and the lower base 2 comprises left and right lower vertical walls 21, each vertical wall is provided with a sliding slot 312 corresponding to a clamping block 31 on the base, each sliding slot 312 is a long hole extending vertically, wherein the two sliding slots 312 on the upper vertical wall 11 are opposite to each other and the distance between them increases from top to bottom, and the two sliding slots 312 on the lower vertical wall 21 are opposite to each other and the distance between them decreases from top to bottom, and each clamping block 31 is provided with a sliding block 311 corresponding to it, each sliding block 311 is embedded in the corresponding sliding slot 312 and can move back and forth along the length direction of the sliding slot 312. Thus, the up and down movement of each clamping block 31 relative to the base can be realized, and the distance between the two clamping blocks 31 in each clamping block group 3 can be changed by the synchronous up and down movement of the two clamping blocks 31, thereby realizing the adjustment of the size of each clamping gap 30 according to the width of the sample 4.

[0038] Preferably, each of the clamping block groups 3 is arranged on the front side of the corresponding vertical wall, and each sliding block 311 is protruded on the back of the corresponding clamping block 31, each sliding block 311 extends front and back and has an elongated cross section, and the width of each sliding block 311 matches the width of the corresponding sliding slot 312, and the angle between each sliding block 311 and the vertical direction is the same as the angle between the corresponding sliding slot 312 and the vertical direction. Thus, each sliding block 311 stably slides back and forth along the corresponding sliding slot 312, and then each clamping block 31 moves up and down smoothly, which is beneficial to ensure the reliability of the size adjustment of each clamping gap 30.

[0039] Preferably, the front side of each vertical wall is provided with a vertically extending guide strip 13, and the adjusting platform is recessed with a vertically extending guide groove 23, and each guide strip 13 is embedded in the corresponding guide groove 23, so that each adjusting platform can move back and forth along the corresponding guide strip 13. Thus, each adjusting platform can move up and down smoothly, which is beneficial to the synchronous up and down movement of the two clamping blocks 31 in each clamping block group 3 driven by the corresponding adjusting platform.

[0040] Specifically, in the embodiment, the upper base 1 is shaped as an inverted L, and the lower base 2 is shaped as an L. The upper base 1 further comprises an upper horizontal wall 12 above the upper vertical wall 11, and the lower base 2 further comprises a lower horizontal wall 22 below the lower vertical wall 21. The upper horizontal wall 12 is provided with an upper mounting hole 121, and the lower horizontal wall 22 is provided with a lower mounting hole 221. The upper adjusting platform 51 is vertically provided with a first screw hole 511, and the lower adjusting platform 52 is vertically provided with a second screw hole 521. The first mounting bolt 53 is sequentially passed through the upper mounting hole 121 and the first screw hole 511 from top to bottom and fastened by a nut, and the second mounting bolt 54 is sequentially passed through the lower mounting hole 221 and the second screw hole 521 from bottom to top and fastened by a nut. When the adjusting platforms are moved to the desired positions, they are locked by the corresponding mounting bolts, so that the adjusting platforms are stably positioned at the desired height, and the clamping block groups 3 are stably positioned at the desired height, so that the clamping gaps 30 are stably maintained at the desired size.

[0041] Further, in the embodiment, the upper adjusting platform 51 is shaped as a U and arranged along the left-right direction, and the two ends are respectively provided with the first screw hole 511, so that the upper adjusting platform 51 can be stably mounted on the upper base 1. The clamping block group 3 on the upper base 1 is accommodated in the upper accommodating groove 510 of the upper adjusting platform 51. The bottom wall of the upper adjusting platform 51 is concave at the middle of the length direction of the front end, and the upper clamping block 321 is protruded on the front inner side of the bottom surface of each clamping block 31 on the upper base 1. The two upper clamping blocks 321 are combined left and right and embedded in the upper clamping groove 5100. The inner bottom surface of the upper adjusting platform 51 and the bottom surface of the clamping block group 3 on the upper base 1 are always in vertical contact, so that the corresponding clamping block group 3 and the upper adjusting platform 51 are stably arranged on the upper base 1, and the upper adjusting platform 51 can reliably drive the corresponding clamping block group 3 to move upward. Meanwhile, the lower adjusting platform 52 is shaped as an inverted U and arranged along the left-right direction, and the two ends are respectively provided with the second screw hole 521, so that the lower adjusting platform 52 can be stably mounted on the lower base 2. The clamping block group 3 on the lower base 2 is accommodated in the lower accommodating groove 520 of the lower adjusting platform 52. The top wall of the lower adjusting platform 52 is concave at the middle of the length direction of the front end, and the lower clamping block 322 is protruded on the front inner side of the top surface of each clamping block 31 on the lower base 2. The two lower clamping blocks 322 are combined left and right and embedded in the lower clamping groove 5200. The inner top surface of the lower adjusting platform 52 and the top surface of the clamping block group 3 on the lower base 2 are always in vertical contact, so that the corresponding clamping block group 3 and the lower adjusting platform 52 are stably arranged on the lower base 2, and the lower adjusting platform 52 can reliably drive the corresponding clamping block group 3 to move downward.

[0042] Preferably, the longitudinal section of the upper groove 510 in the upper adjusting platform 51 is in the shape of an inverted isosceles trapezoid, and correspondingly, the longitudinal section of the clamping block group 3 on the upper base 1 is also in the shape of an inverted isosceles trapezoid. In the initial state, the clamping block group 3 on the upper base 1 is in abutment with the groove walls of the upper groove 510 and the upper buckle groove 5100. And the longitudinal section of the lower groove 520 in the lower adjusting platform 52 is in the shape of an isosceles trapezoid, and correspondingly, the longitudinal section of the clamping block group 3 on the lower base 2 is also in the shape of an isosceles trapezoid. In the initial state, the clamping block group 3 on the lower base 2 is in abutment with the groove walls of the lower groove 520 and the lower buckle groove 5200. On the one hand, the cooperation of each clamping block group 3 with the corresponding adjusting platform can make each clamping block group 3 more stably maintain in the initial state, so as to make each clamping gap 30 maintain maximum in the initial state. On the other hand, it can make the sliding block 311 on each clamping block 31 more smoothly slide along the corresponding sliding groove 312, so as to better realize the adjustment of the size of each clamping gap 30.

[0043] Further, the two clamping sides 300 constituting the clamping gap 30 in each of the clamping block groups 3 are respectively provided with anti-slip textures. It is beneficial to stably clamp the sample 4 and avoid displacement of the sample 4 during the test. Preferably, the anti-slip textures on each of the clamping sides 300 are anti-slip protrusions 6 extending in the front-rear direction, which are uniformly arranged up and down along the height direction of the clamping side 300, and each anti-slip protrusion 6 is arranged by anti-slip protrusions 61 uniformly arranged in the front-rear direction, so as to better prevent the sample 4 from being displaced during the test.

[0044] Further, a clamp 7 for preventing buckling is clamped in the middle of the sample 4 along the length direction of the sample 4, so as to prevent the sample 4 from buckling deformation. In the present embodiment, the clamp 7 comprises two long strip-shaped clamping pieces 71, which clamp the middle of the sample 4 and are clamped by fasteners (such as bolts and nuts).

Claims

1. A fatigue testing fixture for steel plates used in automobile chassis, characterized in that, The upper base (1) and the lower base (2) are arranged vertically, and each base is provided with a clamping block group (3), each clamping block group (3) includes two clamping blocks (31) arranged side by side, and a vertical clamping gap (30) is formed between the two clamping blocks (31), In the sample (4) loading state, the sample (4) extends vertically, and the upper and lower ends of the sample (4) are clamped in the corresponding clamping gap (30), And the upper base (1) is further provided with an upper adjusting table (51), and the lower base (2) is further provided with a lower adjusting table (52) located directly below the upper adjusting table (51), each adjusting table can move vertically relative to the base, and the two clamping blocks (31) in each clamping block group (3) can move up and down relative to the base, And in the initial state, the upper adjusting table (51) is at the lowest position and the lower adjusting table (52) is at the highest position, the width of the clamping gap (30) of each clamping block group (3) is maximum, when the upper adjusting table (51) moves upward and drives the clamping blocks (31) of the clamping block group (3) of the upper base (1) to move upward synchronously, the width of the clamping gap (30) of the clamping block group (3) on the upper base (1) decreases, at the same time, the lower adjusting table (52) moves downward and drives the clamping blocks (31) of the clamping block group (3) on the lower base (2) to move downward synchronously, the width of the clamping gap (30) of the clamping block group (3) on the lower base (2) decreases.

2. The fatigue test jig for a steel sheet for an automobile underbody according to claim 1, characterized by, The upper base (1) includes upper vertical walls (11) arranged left and right, and the lower base (2) includes lower vertical walls (21) arranged left and right, each vertical wall is provided with a sliding groove (312) corresponding to the clamping block (31) on the base, each sliding groove (312) is an elongated hole extending vertically, wherein the two sliding grooves (312) on the upper vertical wall (11) are directly opposite and the distance between them increases from top to bottom, and the two sliding grooves (312) on the lower vertical wall (21) are directly opposite and the distance between them decreases from top to bottom, and each clamping block (31) is provided with a sliding block (311) at the corresponding position, each sliding block (311) is embedded in the corresponding sliding groove (312) and can move back and forth along the length direction of the sliding groove (312).

3. The fatigue test jig for a steel sheet for an automobile underbody according to claim 2, characterized by Each clamping block group (3) is arranged on the front side of the corresponding vertical wall, and each sliding block (311) is protruded on the back of the corresponding clamping block (31), each sliding block (311) extends front and back and has an elongated cross section, and the width of each sliding block (311) matches the width of the corresponding sliding groove (312), and the angle between each sliding block (311) and the vertical direction is the same as the angle between the corresponding sliding groove (312) and the vertical direction.

4. The fatigue test jig for a steel sheet for an automobile underbody according to claim 3, characterized by The front surface of each vertical wall is provided with a vertically extending guide strip (13), and each adjusting table is recessed with a vertically extending guide groove (23), and each guide strip (13) is embedded in the corresponding guide groove (23), so that each adjusting table can move back and forth along the corresponding guide strip (13).

5. The fatigue test jig for a steel sheet for an automobile underbody according to claim 4, characterized by The upper base (1) is in the shape of an inverted L, and the lower base (2) is in the shape of an L, the upper base (1) further comprises an upper horizontal wall (12) above the upper vertical wall (11), and the lower base (2) further comprises a lower horizontal wall (22) below the lower vertical wall (21), The upper horizontal wall (12) is provided with an upper mounting hole (121), and the lower horizontal wall (22) is provided with a lower mounting hole (221), and the upper adjusting platform (51) is vertically provided with a first screw hole (511), and the lower adjusting platform (52) is vertically provided with a second screw hole (521), the first mounting bolt (53) passes through the upper mounting hole (121) and the first screw hole (511) from top to bottom and is fastened by a nut, and the second mounting bolt (54) passes through the lower mounting hole (221) and the second screw hole (521) from bottom to top and is fastened by a nut.

6. The fatigue test jig for a steel sheet for an automobile underbody according to claim 5, characterized by The upper adjusting platform (51) is in the shape of a U, is arranged along the left-right direction, and is provided with the first screw hole (511) at both ends, the clamping block group (3) on the upper base (1) is accommodated in the upper accommodating groove (510) of the upper adjusting platform (51), the front end of the bottom wall of the upper adjusting platform (51) is recessed in the middle along the length direction and is provided with an upper buckle groove (5100) penetrating upward and downward, the front inner side of the bottom surface of each clamping block (31) on the upper base (1) is protrudingly provided with an upper buckle block (321), the two upper buckle blocks (321) are spliced left and right and embedded in the upper buckle groove (5100), and the inner bottom surface of the upper adjusting platform (51) and the bottom surface of the clamping block group (3) on the upper base (1) are always in upward and downward abutment, Meanwhile, the lower adjusting platform (52) is in the shape of an inverted U, is arranged along the left-right direction, and is provided with the second screw hole (521) at both ends, the clamping block group (3) on the lower base (2) is accommodated in the lower accommodating groove (520) of the lower adjusting platform (52), the front end of the top wall of the lower adjusting platform (52) is recessed in the middle along the length direction and is provided with a lower buckle groove (5200) penetrating upward and downward, the front inner side of the top surface of each clamping block (31) on the lower base (2) is protrudingly provided with a lower buckle block (322), the two lower buckle blocks (322) are spliced left and right and embedded in the lower buckle groove (5200), and the inner top surface of the lower adjusting platform (52) and the top surface of the clamping block group (3) on the lower base (2) are always in upward and downward abutment.

7. The fatigue test jig for a steel sheet for an automobile underbody according to claim 6, characterized by The longitudinal section of the upper accommodating groove (510) in the upper adjusting platform (51) is in the shape of an inverted isosceles trapezoid, and correspondingly, the longitudinal section of the clamping block group (3) on the upper base (1) is also in the shape of an inverted isosceles trapezoid, in the initial state, the clamping block group (3) on the upper base (1) is in left-right abutment with the groove walls of the upper accommodating groove (510) and the upper buckle groove (5100), and the longitudinal section of the lower accommodating groove (520) in the lower adjusting platform (52) is in the shape of an isosceles trapezoid, and correspondingly, the longitudinal section of the clamping block group (3) on the lower base (2) is also in the shape of an isosceles trapezoid, in the initial state, the clamping block group (3) on the lower base (2) is in left-right abutment with the groove walls of the lower accommodating groove (520) and the lower buckle groove (5200).

8. The fatigue test jig for a steel sheet for an automobile underbody according to any one of claims 1 to 7, characterized by Two clamping sides (300) of each of the clamping block groups (3) are respectively provided with anti-skid textures.

9. The fatigue test jig for a steel sheet for an automobile underbody according to claim 8, characterized by The anti-skid textures on the clamping sides (300) are anti-skid protrusions (6) extending in the front-rear direction, which are arranged in the up-down direction along the height of the clamping sides (300), and each of the anti-skid protrusions (6) is arranged by anti-skid protrusions (61) arranged in the front-rear direction.

10. The fatigue test jig for a steel sheet for an automobile undercarriage according to any one of claims 1 to 7, characterized by A clamp (7) for preventing buckling is clamped at the middle of the length direction of the sample (4).

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