A metal sheet bending fatigue test device

Abstract

The application provides a metal plate bending fatigue test device, relates to the technical field of bending fatigue test auxiliary, and comprises a gantry, a test device support, a test pressure applying assembly and two bearing assemblies, the test pressure applying assembly comprises a hydraulic push rod, a T-shaped plate, a rotary air cylinder, an adjustable pressure applying piece and a roller assembly; the two bearing assemblies each comprise a supporting round rod, a cross rod seat and a vertical plate seat, two round rollers are arranged between the two supporting round rods, and the two ends of the two round rollers are each provided with a ratchet wheel assembly; the technical key points are that the adjustable pressure applying piece and the roller assembly are driven by the T-shaped plate to move to the bottom through the hydraulic push rod, the adjustable pressure applying piece drives the roller assembly to rotate through the rotary air cylinder, the sample plate is supported by the supporting round rod and the round roller, pressure is applied when the roller assembly rolls at the center of the top of the sample plate, the bending angle of the sample plate is expanded, data acquisition during subsequent sample fatigue test is facilitated, and basic requirements of simulation working conditions are provided.

Description

Technical Field

[0001] This invention relates to the field of auxiliary technology for bending fatigue testing, specifically a device for testing the bending fatigue of metal sheets. Background Technology

[0002] Bending fatigue is a fatigue failure phenomenon that occurs in materials under alternating bending stress, commonly seen in metallic parts and novel flexible materials. Based on the characteristics of the stress, it can be divided into three categories: uniaxial bending fatigue, biaxial bending fatigue, and rotational bending fatigue. The location of the fatigue nucleus varies, and it is significantly influenced by material properties, load magnitude, and stress concentration.

[0003] Bending fatigue testing is a method for evaluating the fatigue performance of materials or products under cyclic bending stress. This test primarily simulates the bending stress experienced by a product during use to detect the fatigue life and performance of the material or product. Bending fatigue testing is widely used for various materials and products, such as metals, plastics, and composite materials, to ensure their reliability and safety in practical use.

[0004] Bending fatigue testing methods can be divided into periodic bending fatigue testing, non-periodic bending fatigue testing, rotational bending fatigue testing, and combined bending fatigue testing, depending on the testing principle and conditions.

[0005] Periodic bending fatigue testing applies periodic bending stress to a specimen at a specific frequency and amplitude to simulate the fatigue environment in actual use. By measuring the fatigue life and performance parameters of the specimen, the durability and reliability of the material are evaluated. Non-periodic bending fatigue testing applies random or non-periodic bending stress to the specimen to simulate unstable or random fatigue environments. It is mainly used to evaluate non-periodic stresses (such as stresses caused by natural factors like earthquakes and wind vibrations) experienced by products during use. Rotational bending fatigue testing fixes the specimen on a rotating shaft, subjecting it to bending stress while undergoing rotational motion. This method is mainly used to evaluate the fatigue performance of rotating mechanical parts (such as bearings and gears). Composite bending fatigue testing applies multiple forms of bending stress (such as bending, torsion, and compression) to the specimen simultaneously to simulate more complex fatigue cycles. It is mainly used to evaluate the fatigue performance of products subjected to multiple stresses in actual use.

[0006] The patent document CN119164804A discloses a bending fatigue testing device and method for carbon fiber unidirectional resin composite plates. By setting up a seat plate, end limiting components, lifting extrusion platform and two upper extrusion rods, after limiting the two ends of the carbon fiber composite sample, the two upper extrusion rods can be used to realize multi-point bending extrusion testing of the carbon fiber composite sample. With the setting of bottom extrusion components and linkage components, when the upper extrusion of the carbon fiber composite sample is performed, the lower extrusion of the carbon fiber composite sample can also be realized, so as to more comprehensively realize multi-point bending fatigue testing of the carbon fiber composite sample.

[0007] Meanwhile, through the coordinated arrangement of the toothed plate, mounting frame, third hydraulic telescopic rod, and lower extrusion rod, the carbon fiber composite sample can be subjected to multi-point bending fatigue testing at different frequencies by adjusting the extension and retraction of the third hydraulic telescopic rod during the overall lifting and lowering of the bottom extrusion assembly.

[0008] However, in the process of implementing the above technical solution, the following technical problems were found:

[0009] The carbon fiber unidirectional resin composite board bending fatigue testing device uses end limiting components to limit both ends of the sample, and uses a lifting extrusion platform and two upper extrusion rods in conjunction with the bottom extrusion component and linkage component to achieve comprehensive bending fatigue testing of the sample. However, in actual application, it is difficult to adjust according to the bending fatigue testing requirements of different plates due to the different degrees of bending and bending angles of different samples, and thus has certain limitations. Summary of the Invention

[0010] To overcome the limitations of existing bending fatigue testing devices, which are constrained by the varying degrees and angles of bending of different plates and cannot be adjusted to meet the testing requirements of different plates, this application provides a bending fatigue testing device for metal plates. A hydraulic push rod controls a T-plate to move an adjustable pressure component and roller assembly downwards. A rotary cylinder drives the adjustable pressure component to rotate the roller assembly, causing the plate, supported by a support rod and rollers, to bend downwards at the center of the plate as the roller assembly rolls. This expands the bending angle of the plate, facilitating data acquisition during subsequent fatigue testing and providing a basis for simulating working conditions.

[0011] The technical solution adopted by the embodiments of this application to solve its technical problem is:

[0012] A metal sheet bending fatigue testing device includes a gantry frame, a testing device support, a testing pressure component, and two load-bearing components. The testing pressure component is located on the top inner wall of the gantry frame.

[0013] Two load-bearing components are symmetrically arranged at the bottom of the test pressure component and located on the inner side of the top of the test device support.

[0014] The test pressure assembly includes a hydraulic push rod, a T-plate is assembled and connected to the bottom of the hydraulic push rod, a rotary cylinder is assembled and connected to one side of the bottom of the T-plate, an adjustable pressure component is provided on the other side of the bottom of the T-plate, and a roller assembly is provided at the bottom of the adjustable pressure component.

[0015] Both of the aforementioned load-bearing components include a support rod and a crossbar seat. Both ends of the support rod and the crossbar seat are integrally formed with a vertical plate seat. Two rollers are arranged between the two support rods. Both ends of the two rollers are provided with ratchet assemblies. A transition seat is provided on the side of the ratchet assembly near the crossbar seat. A support rod is integrally formed on the surface of the transition seat near the crossbar seat. A third spring is sleeved to the outside of the support rod.

[0016] The supporting rod is slidably connected to the inside of one end of the crossbar seat. The template is set on top of the two supporting round rods and two round rollers. The hydraulic push rod controls the T-plate from top to bottom to drive the adjustable pressure component and roller assembly to move to the bottom and apply pressure to the top of the template. The rotary cylinder controls the adjustable pressure component to drive the roller assembly to roll on the top surface of the template.

[0017] In one possible implementation, the T-plate is provided with two guide rods inside the rotary cylinder side, the top of the guide rods is fixed to the top inner wall of the gantry, and the hydraulic push rod controls the hydraulic push rod to slide outside the two guide rods.

[0018] In one possible implementation, one end of the rotary cylinder shaft passes through the bottom of the T-plate and is pinned to a connecting shaft. The outer end of the connecting shaft away from the adjustable pressure component is pinned to a first slide and a second slide. The adjustable pressure component includes a vertical arm, the top of which has a movable groove. The first and second slides both have T-shaped cross-sections. The tops and bottoms of the first and second slides are assembled and fixed by passing bolts through them. The first and second slides are slidably connected inside the movable groove, keeping the vertical arm always between the first and second slides.

[0019] In one possible implementation, the side surface of the upright arm away from the T-plate is provided with four corner seats arranged in a rectangle. The external side of the adapter shaft away from the hydraulic push rod is fitted with a movable seat. Guide rods are provided inside both ends of the movable seat. Multiple equally spaced limiting grooves are opened on the facing side of the two guide rods. The multiple limiting grooves on the two guide rods correspond one-to-one. A limiting plate is inserted into the two limiting grooves in the corresponding state through the interior of the movable seat. The four corner seats are located at the four corners of the movable groove. The two ends of the two guide rods are respectively connected and fixed to the two corner seats on the long side.

[0020] In one possible implementation, a positioning screw passes through the center of the limiting plate, and a first spring and a plate are externally sleeved to one end of the positioning screw. A control head is externally threaded to one end of the positioning screw. A storage groove is formed inside the movable seat on the side away from the upright arm. The limiting plate is slidably connected inside the storage groove. The plate is assembled and fixed to the surface of the movable seat on the side away from the upright arm. The plate and the limiting plate are located between the two ends of the first spring. The control head and the first spring are located on both sides of the plate, respectively.

[0021] In one possible implementation, the support rod is inclined, the outer surface of the roller is fitted with an anti-slip rubber sleeve, and the top surface of the roller is flush with the top surface of the support rod.

[0022] In one possible implementation, the ratchet assembly includes two symmetrical buckles, with a gear rotatably connected between one end of the two buckles, and a support plate assembled to the top surface of the other end of the two buckles. A limiting tooth, supported by bolts passing through the inside of the two buckles, is provided between the support plate and the gear. A second spring is provided between the outer side of the limiting tooth and the support plate, with one end supporting the limiting tooth extending between two adjacent teeth of the gear. Both ends of the roller are pinned to the inside of the two gears in a coaxial state. A limiting pin is pinned between the ends of the two buckles away from the gear, and an adapter seat is located between the two buckles, with the limiting pin pin pinned to the inside of the adapter seat.

[0023] In one possible implementation, the roller assembly includes a first roller and a second roller. The second roller is externally sleeved with a bearing near the side of the first roller, and a C-shaped fastener is fastened to the outside of the bearing. The C-shaped fastener is assembled and fixed to the upright arm, so that the bearing is fixed between the C-shaped fastener and the bottom of the upright arm. Bolts pass through the interior of the second roller, the bearing, and the first roller, and a threaded nut is used to assemble and fix the first roller and the second roller.

[0024] In one possible implementation, the hydraulic push rod controls the T-plate from top to bottom, driving the adjustable pressure component and roller assembly to move downwards, so that the template bends from the center to the bottom under the support of the support rod and roller.

[0025] In one possible implementation, the hydraulic push rod controls the T-plate from top to bottom, driving the adjustable pressure component and roller assembly to move to the bottom. The adjustable pressure component is driven by a rotary cylinder to rotate the roller assembly, so that the template, supported by the support rod and the roller, is limited by the anti-slip rubber sleeve on the outside of the roller. The roller assembly applies pressure as it rolls at the center of the top of the template, causing the center of the template to bend towards the bottom.

[0026] The beneficial effects of this application are as follows:

[0027] First, in this solution, the T-plate is controlled by a hydraulic push rod to move the adjustable pressure component and roller assembly to the bottom. The adjustable pressure component is driven by a rotary cylinder to rotate the roller assembly. Under the support of the support rod and roller, the roller assembly applies pressure as it rolls at the top center of the template, causing the center of the template to bend towards the bottom. This expands the bending angle of the template, which is beneficial for obtaining data during subsequent fatigue testing of the template and provides a basic requirement for simulating the working state.

[0028] Secondly, in this solution, a roller supported by two ratchet assemblies forms a support at the bottom of the template. When the template is subjected to a force applied from top to bottom, the anti-slip rubber sleeve on the outside of the roller and the template provide friction. When the template bends from the center to the bottom, the roller drives the gear to rotate between the two buckles. The teeth on the outside of the gear push the limiting teeth to squeeze the second spring, thus completing the bending of the template.

[0029] At the same time, the gear can be stopped between two adjacent teeth by the limiting teeth supported by the second spring, which restricts the rotation of the roller away from the direction of force on the template. This is beneficial to ensure that when the center of the template bends to the bottom, the ratchet assembly on the two bearing components supports the roller to rotate only towards the bending point of the template through the gear, preventing the bearing components from moving in the horizontal plane during the pressure process. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a metal sheet bending fatigue testing device according to the present invention.

[0031] Figure 2 This is a schematic diagram of the position and structure of the pressure-applying component and the load-bearing component of the metal sheet bending fatigue testing device under working conditions according to the present invention;

[0032] Figure 3 This is an exploded view of the adjustable pressure component of a metal sheet bending fatigue testing device according to the present invention.

[0033] Figure 4 This is an exploded view of the roller assembly of a metal sheet bending fatigue testing device according to the present invention.

[0034] Figure 5 This is a schematic diagram of the internal structure of the movable seat of the metal sheet bending fatigue testing device of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the load-bearing component of the metal sheet bending fatigue testing device of the present invention;

[0036] Figure 7 This is an exploded view of the ratchet assembly of a metal sheet bending fatigue testing device according to the present invention.

[0037] Figure 8 This is a planar schematic diagram of the metal sheet bending fatigue testing device of the present invention applying pressure to the surface of a gantry frame.

[0038] Figure label:

[0039] 1. Gantry frame;

[0040] 2. Test pressure application components; 21. Guide column; 22. T-plate; 23. Hydraulic push rod; 24. Roller assembly; 241. First wheel; 242. Second wheel; 243. Bearing; 25. Adjustable pressure application component; 251. Movable seat; 252. Vertical arm; 253. Guide rod; 254. C-type buckle; 255. Positioning screw; 256. First spring; 257. Plate; 258. Control head; 259. Limiting plate; 26. Rotary cylinder; 27. First slide; 28. Second slide; 29. ​​Angle seat; 210. Adapter shaft;

[0041] 3. Test device support frame;

[0042] 4. Load-bearing component; 41. Support rod; 42. Crossbar seat; 43. Vertical plate seat; 44. Circular roller; 45. Adapter seat; 46. Ratchet assembly; 461. Gear; 462. Buckle plate; 463. Limiting tooth; 464. Limiting pin; 465. Support plate; 466. Second spring; 47. Third spring; 48. Support rod;

[0043] 5. Sample;

[0044] 6. Movable groove; 7. Limiting groove; 8. Storage groove. Detailed Implementation

[0045] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0046] Example 1:

[0047] This embodiment describes the specific structure of a bending fatigue testing device for metal sheets, as detailed in the following reference. Figures 1-5 As shown, it includes a gantry frame 1, a test device support 3, a test pressure component 2 set on the inner wall of the top of the gantry frame 1, and two load-bearing components 4. The two load-bearing components 4 are symmetrically arranged on the left and right sides at the bottom of the test pressure component 2 and located on the inner side of the top of the test device support 3.

[0048] like Figure 1 and Figure 2 As shown, the test pressure assembly 2 includes a hydraulic push rod 23, a T-plate 22 is assembled and connected to the bottom of the hydraulic push rod 23, a rotary cylinder 26 is assembled and connected to one side of the bottom of the T-plate 22, an adjustable pressure component 25 is provided on the other side of the bottom of the T-plate 22, and a roller assembly 24 is provided at the bottom of the adjustable pressure component 25.

[0049] The roller assembly 24 includes a first roller 241 and a second roller 242. The second roller 242 is externally connected to a bearing 243 near the side of the first roller 241. A C-shaped fastener 254 is fastened to the outside of the bearing 243. By assembling and fixing the C-shaped fastener 254 to the upright arm 252, the bearing 243 is fixed between the bottom of the C-shaped fastener 254 and the upright arm 252. Bolts pass through the interior of the second roller 242, the bearing 243 and the first roller 241, and are threaded with nuts, so that the first roller 241 and the second roller 242 can be assembled and fixed.

[0050] Both load-bearing components 4 include a support rod 41 and a crossbar seat 42. Both ends of the support rod 41 and the crossbar seat 42 are integrally formed with a vertical plate seat 43. Two rollers 44 are arranged between the two support rods 41. Both ends of the two rollers 44 are provided with ratchet assemblies 46. The outside of the rollers 44 is fitted with an anti-slip rubber sleeve. The top surface of the rollers 44 is flush with the top surface of the support rods 41.

[0051] In the bending fatigue test of template 5, the working state of template 5 was first simulated, that is...

[0052] The hydraulic push rod 23 controls the T-plate 22 from top to bottom to move the adjustable pressure component 25 and the roller assembly 24 to the bottom and apply pressure to the top of the template 5. The rotary cylinder 26 controls the adjustable pressure component 25 to drive the roller assembly 24 to roll on the top surface of the template 5.

[0053] As shown above, when simulating the working state of template 5, there are mainly two states:

[0054] (i) When the hydraulic push rod 23 controls the T-plate 22 to move the adjustable pressure component 25 and the roller assembly 24 to the bottom from the top to the bottom, the template 5 is bent from the center to the bottom under the support of the support rod 41 and the roller 44, so as to achieve the bending effect of the template 5 at a small angle.

[0055] (ii) When the hydraulic push rod 23 controls the T-plate 22 to move from the top to the bottom, driving the adjustable pressure component 25 and the roller assembly 24 to move to the bottom, and the rotary cylinder 26 drives the adjustable pressure component 25 to rotate the roller assembly 24, the template 5 is supported by the support rod 41 and the roller 44, and is limited by the anti-slip rubber sleeve on the outside of the roller 44. When the roller assembly 24 rolls at the top center of the template 5, it applies pressure, causing the center of the template 5 to bend to the bottom. This is beneficial to achieve a bending effect of the template 5 at a larger angle, thereby satisfying the simulation effect of bending various angles of various templates 5.

[0056] Secondly, in order to improve the stability of the hydraulic push rod 23 controlling the up and down movement of the T-plate 22, such as Figure 2 As shown, the T-plate 22 is provided with two guide rods 21 inside on one side of the rotary cylinder 26. By fixing the top of the guide rods 21 to the top inner wall of the gantry frame 1, when the hydraulic push rod 23 controls the hydraulic push rod 23 to slide outside the two guide rods 21, it can assist the hydraulic push rod 23 in controlling the track of the T-plate 22 to move up and down.

[0057] Furthermore, in order to support the adjustable pressure component 25 to move up and down on the side of the bottom of the T-plate 22 away from the rotary cylinder 26, such as... Figure 3 As shown, one end of the rotating shaft of the rotary cylinder 26 passes through the bottom of the T-plate 22 and is pinned to a connecting shaft 210. The outer end of the connecting shaft 210 away from the adjustable pressure member 25 is pinned to a first slide 27 and a second slide 28. The adjustable pressure member 25 includes a vertical arm 252, the top of which has a movable groove 6. By making the cross-sections of both the first slide 27 and the second slide 28 T-shaped, the top and bottom of both the first slide 27 and the second slide 28 pass through a common groove. After being assembled and fixed with bolts, the first slide block 27 and the second slide block 28 can be slidably connected inside the movable slot 6 (that is, the upright arm 252 is slidably connected between the first slide block 27 and the second slide block 28). This ensures that the upright arm 252 is always between the first slide block 27 and the second slide block 28. When the upright arm 252 can be adjusted up and down, the rotary cylinder 26 can control the rotation of the upright arm 252 through the adapter shaft 210, the first slide block 27 and the second slide block 28.

[0058] Meanwhile, in order to ensure that the boom 252 remains at a fixed height when moving between the first slide 27 and the second slide 28, such as Figure 3 and Figure 5As shown, the side surface of the upright arm 252 away from the T-plate 22 is provided with four corner seats 29 arranged in a rectangle. The external end of the adapter shaft 210 away from the hydraulic push rod 23 is fitted with a movable seat 251. The interior of both ends of the movable seat 251 is provided with guide rods 253. Multiple equally spaced limiting grooves 7 are opened on the facing side of the two guide rods 253. The four corner seats 29 are located at the four corners of the movable slot 6. The two ends of the two guide rods 253 are respectively connected and fixed to the two corner seats 29 on the long side. By making the multiple limiting grooves 7 on the two guide rods 253 correspond one-to-one, when the limiting plate 259 is inserted into the corresponding limiting groove 7 through the interior of the movable seat 251, the relative movement of the upright arm 252 and the first slide 27 and the second slide 28 can be restricted, thereby achieving the fixing effect of the upright arm 252 and the first slide 27 and the second slide 28.

[0059] In some examples, a positioning screw 255 passes through the center of the limiting plate 259, and a first spring 256 and a plate 257 are externally connected to one end of the positioning screw 255. A control head 258 is externally threaded to one end of the positioning screw 255, and a storage groove 8 is provided inside the movable seat 251 on the side away from the upright arm 252.

[0060] In this configuration, by sliding the limiting plate 259 inside the storage slot 8, when the plate 257 and the movable seat 251 are assembled and fixed on the surface away from the upright arm 252, the plate 257 and the limiting plate 259 are positioned between the two ends of the first spring 256. The control head 258 and the first spring 256 are located on both sides of the plate 257, and can be supported between the limiting plate 259 and the plate 257 by means of the first spring 256, so that the two ends of the limiting plate 259 are stably positioned between the two limiting slots 7 on the two guide rods 253, and the upright arm 252, the first slide 27, and the second slide 28 remain fixed.

[0061] At the same time, by pulling the control head 258, one end of the positioning screw 255 is compressed inside the limiting plate 259, which compresses the first spring 256. This allows the limiting plate 259 to exit between the two guide rods 253, and then it is easy to elastically return to between the two guide rods 253 by means of the compressed first spring 256.

[0062] The above design uses a hydraulic push rod 23 to control the T-plate 22 to move from top to bottom, in conjunction with the T-plate 22 and the guide rod 21, so as to drive the adjustable pressure component 25 and the roller assembly 24 to move to the bottom and apply pressure to the top of the template 5. In conjunction with the rotary cylinder 26, the adjustable pressure component 25 is controlled to rotate, and the roller assembly 24 is driven to rotate. The hydraulic push rod 23 controls the T-plate 22 to move from top to bottom, so as to drive the adjustable pressure component 25 and the roller assembly 24 to move to the bottom and apply pressure to the template 5 independently, so as to bend the template 5 from the center to the bottom, thus achieving a small-angle bending effect of the template 5.

[0063] Simultaneously, the hydraulic push rod 23 controls the T-plate 22 to move from top to bottom, driving the adjustable pressure component 25 and the roller assembly 24 to move towards the bottom. When the adjustable pressure component 25 is driven by the rotary cylinder 26 to rotate the roller assembly 24, the template 5, supported by the support rod 41 and the roller 44 (the rotation direction of the roller 44 is limited by the ratchet assembly 46), is limited by the anti-slip rubber sleeve on the outside of the roller 44. When the roller assembly 24 rolls at the top center of the template 5, it applies pressure, causing the center of the template 5 to bend towards the bottom. This achieves the effect of expanding the bending angle of the template 5. It is beneficial to use two bending methods of the template 5 to provide a basic requirement for simulating the working state for data acquisition during the subsequent fatigue test of the template 5.

[0064] Example 2:

[0065] Based on Example 1, this example describes the specific structure of the support component 4, such as... Figure 2 , Figures 6 to 8 As shown, the ratchet assembly 46 on the bearing assembly 4 is provided with an adapter 45 on the side near the crossbar seat 42. The adapter 45 is integrally formed with a support rod 48 on the surface of the side near the crossbar seat 42. A third spring 47 is sleeved on the outside of the support rod 48.

[0066] In this configuration, by placing the template 5 on top of two supporting round rods 41 and two round rollers 44, and setting the supporting long rod 48 at an angle, when the template 5 is subjected to pressure from top to bottom, the template 5 bends from the center to the bottom, which can cause the round rollers 44 to apply pressure to the ratchet assembly 46, causing the adapter 45 to drive the supporting long rod 48 to slide inside one end of the crossbar seat 42, compressing the third spring 47 between the adapter 45 and the crossbar seat 42.

[0067] Meanwhile, with the help of the external anti-slip rubber sleeve fitted to the circular roller 44, when the hydraulic push rod 23 controls the T-plate 22 to move the adjustable pressure component 25 and the roller assembly 24 to the bottom from the top to the bottom, and the rotary cylinder 26 drives the adjustable pressure component 25 to rotate the roller assembly 24, the template 5 is supported by the support rod 41 and the circular roller 44, and is limited by the anti-slip rubber sleeve on the outside of the circular roller 44. When the roller assembly 24 rolls at the top center of the template 5, pressure is applied. The rotation direction of the circular roller 44 can be limited by the ratchet assembly 46 to prevent the template 5 from moving on the top of the circular roller 44 and the support rod 41, so as to adapt to the force that tends to control the movement of the template 5 when the rotary cylinder 26 controls the adjustable pressure component 25 to drive the roller assembly 24 to roll on the top of the template 5.

[0068] As shown in the figure, the ratchet assembly 46 includes two symmetrical buckle plates 462. A gear 461 is rotatably connected between one end of the two buckle plates 462. A support plate 465 is assembled and connected to the top surface of the other end of the two buckle plates 462. A limiting tooth 463 supported by bolts passing through the inside of the two buckle plates 462 is provided between the support plate 465 and the gear 461. A second spring 466 is provided between the outer side of the limiting tooth 463 and the support plate 465.

[0069] In this way, by having the two ends of the second spring 466 abut against the support plate 465 and the limiting tooth 463 respectively, one end of the limiting tooth 463 can be supported to extend into the two adjacent teeth of the gear 461, thereby pinning the two ends to the circular roller 44 inside the two gears 461 in the coaxial state, which can only rotate in one direction.

[0070] Secondly, by pinning a limiting pin 464 between the ends of the two buckles 462 away from the gear 461, the adapter 45 is positioned between the two buckles 462, and the limiting pin 464 is pinned to the inside of the adapter 45, which helps to limit the rotation of the connection point between the adapter 45 and the two buckles 462.

[0071] The above design utilizes a circular roller 44 supported by two ratchet assemblies 46 to form a support at the bottom of the template 5. When the template 5 is subjected to a force applied from the top to the bottom, friction is provided by the contact between the anti-slip rubber sleeve on the outside of the circular roller 44 and the template 5. When the template 5 bends from the center to the bottom, the friction between the template 5 and the anti-slip rubber sleeve on the outside of the circular roller 44 drives the circular roller 44 to rotate between the two ratchet assemblies 46.

[0072] During this process, the roller 44 drives the gear 461 to rotate between the two buckle plates 462. The teeth on the outside of the gear 461 push the limiting teeth 463 to squeeze the second spring 466. When rotating in the opposite direction, the gear 461 abuts against the two adjacent teeth with the help of the limiting teeth 463 supported by the second spring 466, restricting the roller 44 from rotating away from the direction of force on the template 5. This is beneficial to ensure that when the center of the template 5 bends to the bottom, the ratchet assembly 46 on the two bearing components 4 supports the roller 44 to rotate only towards the bending point of the template 5 through the gear 461, preventing the bearing components 4 from moving in the horizontal plane during the pressure process.

[0073] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A device for testing the bending fatigue of metal sheets, characterized in that, Include: Gantry (1); Test device support (3); Test pressure assembly (2) is provided at the top of the inner wall of the gantry (1); Two bearing assemblies (4) are symmetrically arranged at the bottom of the test pressure assembly (2), and are located at the inner side of the top of the test device support (3); The test pressure assembly (2) comprises a hydraulic push rod (23), the bottom of the hydraulic push rod (23) is assembled and connected with a T-shaped plate (22), one side of the bottom of the T-shaped plate (22) is assembled and connected with a rotary air cylinder (26), the other side of the bottom of the T-shaped plate (22) is provided with an adjustable pressure piece (25), the adjustable pressure piece (25) comprises a vertical arm (252), the top of the vertical arm (252) is provided with a movable strip slot (6), one end of the rotary air cylinder (26) shaft penetrates through the bottom of the T-shaped plate (22), and is pinned with a transfer shaft (210), the outer end of the transfer shaft (210) away from the adjustable pressure piece (25) is pinned with a first sliding seat (27) and a second sliding seat (28), the bottom of the adjustable pressure piece (25) is provided with a roller assembly (24); The side surface of the vertical arm (252) away from the T-shaped plate (22) is provided with four corner seats (29) arranged in a rectangular shape, the outer end of the transfer shaft (210) away from the hydraulic push rod (23) is assembled and fixed with a movable seat (251), the inner ends of both ends of the movable seat (251) are provided with guide rods (253), a plurality of equally spaced limiting grooves (7) are formed in the guide rods (253) facing each other, a positioning screw (255) penetrates through the center of the limiting long plate (259), the outer end of one end of the positioning screw (255) is sleeved and connected with a first spring (256) and a plate (257), the outer end of one end of the positioning screw (255) is threadedly connected with a control head (258), the inner end of one side of the movable seat (251) away from the vertical arm (252) is provided with a receiving groove (8); Both the bearing assemblies (4) comprise a supporting round rod (41) and a cross rod seat (42), both ends of the supporting round rod (41) and the cross rod seat (42) are integrally formed with a vertical plate seat (43), two round rollers (44) are arranged between the two supporting round rods (41), both ends of the two round rollers (44) are provided with a ratchet wheel assembly (46), the ratchet wheel assembly (46) is provided with a transfer seat (45) on the side close to the cross rod seat (42), the transfer seat (45) is integrally formed with a supporting long rod (48) on the side surface close to the cross rod seat (42), the outer end of the supporting long rod (48) is sleeved and connected with a third spring (47); Wherein, the cross section of the first sliding seat (27) and the second sliding seat (28) is T-shaped, the top and bottom of the first sliding seat (27) and the second sliding seat (28) are assembled and fixed by penetrating through the bolt, the first sliding seat (27) and the second sliding seat (28) are slidingly connected in the inner part of the movable strip slot (6), and the vertical arm (252) is always kept between the first sliding seat (27) and the second sliding seat (28). The support long rod (48) is slidingly connected in the inside of one end of the cross rod seat (42), the template (5) is erected on the top of the two support round rods (41) and the two round rollers (44), the hydraulic push rod (23) drives the adjustable pressing part (25) and the roller assembly (24) to move to the bottom by controlling the T-shaped plate (22) from the top to the bottom, and presses the top of the template (5), the rotary air cylinder (26) controls the adjustable pressing part (25) to drive the roller assembly (24) to roll on the top surface of the template (5).

2. A metal sheet bend fatigue testing apparatus as claimed in claim 1, wherein: The T-shaped plate (22) is provided with two guide vertical rods (21) in the inside of one side of the rotary air cylinder (26), the top of the guide vertical rod (21) is fixed to the top inner wall of the gantry (1), and the hydraulic push rod (23) controls the hydraulic push rod (23) to slide outside the two guide vertical rods (21).

3. The metal sheet bend fatigue testing apparatus of claim 1 wherein: A plurality of limiting grooves (7) on the two guide rods (253) are one-to-one corresponding, a limiting long plate (259) is insertedly connected into the two limiting grooves (7) in the corresponding state through the inside of the movable seat (251), and four corner seats (29) are located at four corners of the movable slot (6). The limiting long plate (259) is slidingly connected in the inside of the storage groove (8), the plate piece (257) is assembled and fixed on the surface, away from the vertical arm (252), of the movable seat (251), the plate piece (257) and the limiting long plate (259) are located between the two ends of the first spring (256), and the control head (258) and the first spring (256) are located on the two sides of the plate piece (257) respectively.

4. The metal sheet bend fatigue testing apparatus of claim 1 wherein: The support long rod (48) is inclinedly arranged, the outer part of the round roller (44) is sleeved with an antiskid rubber sleeve, and the top surface of the round roller (44) is flush with the top surface of the support round rod (41).

5. The apparatus for testing the bending fatigue of sheet metal according to claim 1, wherein: The sprocket assembly (46) comprises two buckle plates (462) which are symmetrical to each other, a gear (461) is rotatably connected between one end of the two buckle plates (462), a support plate (465) is assembledly connected to the top surface of the other end of the two buckle plates (462), and a limiting tooth (463) supported by a bolt penetrating through the inside of the two buckle plates (462) is arranged between the support plate (465) and the gear (461). The outside of the limiting tooth (463) and the support plate (465) are provided with a second spring (466), one end of the limiting tooth (463) supported by the second spring (466) extends into the adjacent two teeth of the gear (461), and the two ends of the round roller (44) are respectively pinned to the inside of the two gears (461) in the same shaft state. A limiting pin rod (464) is pinned between the ends of the two buckle plates (462) away from the gear (461), the adapter seat (45) is located between the two buckle plates (462), and the limiting pin rod (464) is pinned into the inside of the adapter seat (45).

6. A metal sheet bend fatigue testing apparatus as defined in claim 1, wherein: The roller assembly (24) comprises a first wheel disc (241) and a second wheel disc (242), the second wheel disc (242) is connected with a bearing (243) through a sleeve joint on the outside of the side of the first wheel disc (241), the outside of the bearing (243) is buckled with a C-shaped buckle (254); The C-shaped buckle (254) is assembled and fixed with the vertical arm (252), the bearing (243) is fixed between the C-shaped buckle (254) and the bottom of the vertical arm (252), the bolt passes through the inside of the second wheel disc (242), the bearing (243) and the first wheel disc (241), and the first wheel disc (241) and the second wheel disc (242) are assembled and fixed through the threaded connection of the nut.

7. The apparatus for testing the bending fatigue of sheet metal according to claim 1, wherein: The hydraulic push rod (23) drives the adjustable pressure element (25) and the roller assembly (24) to move to the bottom by controlling the T-shaped plate (22) from the top to the bottom, so that the sample plate (5) is curved to the bottom from the center under the support of the supporting round rod (41) and the round roller (44).

8. The apparatus for testing the bending fatigue of sheet metal according to claim 1, wherein: The hydraulic push rod (23) drives the adjustable pressure element (25) and the roller assembly (24) to move to the bottom by controlling the T-shaped plate (22) from the top to the bottom, and the adjustable pressure element (25) drives the roller assembly (24) to rotate by the rotary air cylinder (26), so that the sample plate (5) is curved to the bottom from the center under the support of the supporting round rod (41) and the round roller (44), and is limited by the anti-skid rubber sleeve outside the round roller (44), and the roller assembly (24) applies pressure when rolling on the top center of the sample plate (5).

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