Sheet metal bending fatigue testing device

Abstract

The invention provides a metal plate bending fatigue testing device, and relates to the technical field of bending fatigue testing assistion.The metal plate bending fatigue testing device comprises a portal frame, a testing device support, a testing pressure applying assembly and two bearing assemblies, and the testing pressure applying assembly comprises a hydraulic push rod, a T-shaped plate, a rotating air cylinder, an adjustable pressure applying piece and a roller assembly; the two bearing assemblies each comprise a supporting round rod, a transverse rod base and a vertical plate base, two round rollers are arranged between the two supporting round rods, and ratchet wheel assemblies are arranged at the two ends of the two round rollers; according to the technical scheme, a T-shaped plate is controlled by a hydraulic push rod to drive an adjustable pressure applying piece and a roller assembly to move towards the bottom, and a rotary air cylinder drives the adjustable pressure applying piece to drive the roller assembly to rotate, so that a sample plate is supported by a supporting round rod and a round roller, and the roller assembly applies pressure when rolling at the center of the top of the sample plate; the effect of expanding the bending angle of the sample plate is achieved, and the basic requirement for simulating the working state is provided for data acquisition in the subsequent sample plate fatigue test.

Description

Technical Field

[0001] The invention relates to the technical field of bending fatigue test assistance, in particular to a bending fatigue test device for metal plates. Background Art

[0002] Bending fatigue is a phenomenon of fatigue failure of materials under alternating bending stress, which is common in the fields of metal parts and new flexible materials. According to the stress characteristics, it can be divided into three categories: unidirectional bending, bidirectional bending and rotational bending fatigue. The location characteristics of the fatigue core are different and are significantly affected by the material properties, load size and stress concentration. Flexural fatigue testing is a method for evaluating the fatigue performance of materials or products subjected to cyclic bending stress. This test simulates the bending stresses to which a product is subjected during use to determine the fatigue life and performance of the material or product. Flexural fatigue testing is widely used on a variety of materials and products, such as metals, plastics, and composites, to ensure their reliability and safety in actual use.

[0003] The methods of bending fatigue testing can be divided into cyclic bending fatigue testing, non-cyclic bending fatigue testing, rotational bending fatigue testing and composite bending fatigue testing according to different testing principles and conditions.

[0004] Cyclic bending fatigue testing applies cyclical bending stress to the specimen at a specific frequency and amplitude to simulate the fatigue environment experienced in actual use. The fatigue life and performance parameters of the specimen are then measured to evaluate the durability and reliability of the material. Acyclic bending fatigue testing applies random or non-cyclic bending stress to the specimen to simulate an unstable or random fatigue environment. This is primarily used to evaluate the non-cyclic stresses to which products are subjected during use (such as those caused by natural factors like earthquakes and wind vibration). Rotational bending fatigue testing fixes the specimen to a rotating axis, subjecting it to both rotational motion and bending stress. This method is primarily used to evaluate the fatigue performance of rotating machinery parts (such as bearings and gears). Combined bending fatigue testing simultaneously applies multiple forms of bending stress (such as bending, torsion, and compression) to the specimen to simulate a more complex fatigue cycle. This is primarily used to evaluate the fatigue performance of products subjected to multiple stresses encountered in actual use.

[0005] Patent document with announcement number CN119164804A discloses a device and method for testing bending fatigue of a carbon fiber unidirectional resin composite plate. By setting a seat plate, an end limit assembly, a 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 implement multi-point bending extrusion testing of the carbon fiber composite sample. In conjunction with the setting of the bottom extrusion assembly and the linkage assembly, when the upper part of the carbon fiber composite sample is extruded, the lower part of the carbon fiber composite sample can also be extruded, thereby more comprehensively implementing multi-point bending fatigue testing of the carbon fiber composite sample. At the same time, through the coordinated arrangement of the tooth plate, the mounting frame, the third hydraulic telescopic rod and the lower extrusion rod, during the overall lifting and lowering process of the bottom extrusion assembly, the purpose of multi-point and different frequency bending fatigue testing of the carbon fiber composite sample can be achieved by adjusting the extension and retraction of the third hydraulic telescopic rod.

[0006] However, in the process of implementing the above technical solution, it was found that the above technical solution had the following technical problems: The carbon fiber unidirectional resin composite plate bending fatigue test device uses end limit assemblies to limit the two ends of the sample, and a lifting extrusion platform and two upper extrusion rods cooperate with the bottom extrusion assembly and linkage assembly to achieve comprehensive bending fatigue testing of the sample. However, in actual application, due to the different bending degrees and bending angles of different samples, it is difficult to adjust according to the bending fatigue testing requirements of different plates, and there are certain limitations. Summary of the Invention

[0007] In order to overcome the limitations of existing bending fatigue test devices due to different bending degrees and bending angles of different samples, which makes it difficult to adjust according to the testing requirements of bending fatigue of different plates and has certain limitations, the embodiment of the present application provides a metal plate bending fatigue testing device, which controls the T-plate through a hydraulic push rod to drive the adjustable pressure piece and the roller assembly to move toward the bottom, and the adjustable pressure piece is driven by a rotating cylinder to drive the roller assembly to rotate, so that the sample is supported by the supporting round rod and the round roller, and the roller assembly applies pressure when rolling at the top center of the sample, so that the center of the sample bends toward the bottom, thereby achieving the effect of expanding the bending angle of the sample, which is beneficial to the data acquisition during the subsequent sample fatigue test and provides the basic requirements for simulating the working state.

[0008] The technical solution adopted by the embodiment of the present application to solve the technical problem is: A metal plate bending fatigue testing device comprises a gantry, a testing device bracket, a testing pressure component and two bearing components, wherein the testing pressure component is arranged on the top inner wall of the gantry; The two bearing assemblies are symmetrically arranged at the bottom of the test pressure assembly and located on the inner side of the top of the test device bracket; The test pressure assembly includes a hydraulic push rod, the bottom of the hydraulic push rod is assembled and connected to a T-plate, one side of the bottom of the T-plate is assembled and connected to a rotary cylinder, the other side of the bottom of the T-plate is provided with an adjustable pressure member, and the bottom of the adjustable pressure member is provided with a roller assembly; The two bearing assemblies each include a supporting round rod and a cross bar seat, both ends of the supporting round rod and the cross bar seat are integrally formed with a vertical plate seat, two round rollers are provided between the two supporting round rods, both ends of the two round rollers are provided with a ratchet assembly, a transfer seat is provided on the side of the ratchet assembly close to the cross bar seat, a supporting long rod is integrally formed on the surface of the transfer seat on one side close to the cross bar seat, and a third spring is sleeved and connected to the outside of the supporting long rod; Among them, the supporting long rod is slidably connected to the inside of one end of the cross bar seat, the template is mounted on the top of the two supporting round rods and two round rollers, and the hydraulic push rod controls the T-plate from top to bottom to drive the adjustable pressure piece and the roller assembly to move toward the bottom and apply pressure to the top of the template. The rotating cylinder controls the adjustable pressure piece to drive the roller assembly to roll on the top surface of the template.

[0009] In one possible implementation, the T-plate is located inside one side of the rotating cylinder and has two guide uprights, the tops of the guide uprights are 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 uprights.

[0010] In one possible implementation, one end of the rotating cylinder shaft passes through the bottom of the T-plate and is pinned to a transfer shaft, and the transfer shaft is pinned to the outside of one end of the adjustable pressure member away from the first slide and the second slide; the adjustable pressure member includes a vertical arm, and a movable groove is provided on the top of the vertical arm; the cross-sections of the first slide and the second slide are both T-shaped, and the tops and bottoms of the first slide and the second slide are assembled and fixed by passing bolts together, and the first slide and the second slide are slidably connected to the inside of the movable groove, and the vertical arm is always kept between the first slide and the second slide.

[0011] In one possible implementation, the surface of the vertical arm on one side away from the T-plate is provided with four corner seats arranged in a rectangular shape, and a movable seat is fixed to the outside of the adapter shaft away from one end of the hydraulic push rod, and guide rods are provided inside both ends of the movable seat, and a plurality of equally spaced limit grooves are opened on the surfaces of the two guide rods; the multiple limit grooves on the two guide rods correspond to each other one by one, and the limiting long plate is plug-in connected to the inside of the two limit grooves in the corresponding state through the inside of the movable seat, and the four corner seats are located at the four corners of the movable strip groove, and the two ends of the two guide rods are respectively connected and fixed to the two corner seats at the long sides.

[0012] In one possible implementation, a positioning screw passes through the center of the limiting long plate, one end of the positioning screw is externally sleeved with a first spring and a plate, one end of the positioning screw is externally threaded with a control head, and a receiving groove is provided inside the movable seat away from the vertical arm; the limiting long plate is slidably connected to the inside of the receiving groove, and the plate is assembled and fixed to the surface of the movable seat away from the vertical arm, the plate and the limiting long plate are located between the two ends of the first spring, and the control head and the first spring are respectively located on both sides of the plate.

[0013] In a possible implementation, the supporting long rod is arranged at an angle, the outside of the round roller is sleeved with a non-slip rubber sleeve, and the top surface of the round roller is flush with the top surface of the supporting round rod.

[0014] In one possible implementation, the ratchet assembly includes two symmetrical buckle plates, a gear is rotatably connected between one end of the two buckle plates, and a support plate is assembled on the top surface of the other end of the two buckle plates, and a limiting tooth supported by bolts passing through the inside of the two buckle plates 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, and one end of the supporting limiting tooth extends between two adjacent teeth of the gear, and the two ends of the circular roller are respectively pinned to the inside of the two gears in a coaxial state; a limiting pin rod is pinned between the ends of the two buckle plates away from the gear, and the adapter is located between the two buckle plates, and the limiting pin rod is pinned to the inside of the adapter.

[0015] In one possible implementation, the roller assembly includes a first wheel disc and a second wheel disc, the outer portion of the second wheel disc close to the first wheel disc is sleeve-connected with a bearing, and the outer portion of the bearing is buckled with a C-shaped buckle seat; the C-shaped buckle seat is assembled and fixed to the vertical arm, so that the bearing is fixed between the C-shaped buckle seat and the bottom of the vertical arm, and a bolt passes through the interior of the second wheel disc, the bearing and the first wheel disc, and a nut is threadedly connected to assemble and fix the first wheel disc and the second wheel disc.

[0016] In one possible implementation, the hydraulic push rod controls the T-plate from top to bottom to drive the adjustable pressure member and the roller assembly to move toward the bottom, so that the template is supported by the supporting round rod and the round roller and bends from the center to the bottom.

[0017] In one possible implementation, the hydraulic push rod controls the T-plate from top to bottom to drive the adjustable pressure piece and the roller assembly to move toward the bottom, and the adjustable pressure piece is driven by the rotary cylinder to drive the roller assembly to rotate, so that the template is supported by the supporting round rod and the round roller, and is limited by the non-slip rubber sleeve on the outside of the round roller. The roller assembly applies pressure when rolling at the center of the top of the template, causing the center of the template to bend toward the bottom.

[0018] The beneficial effects of this application are: First, in this solution, the hydraulic push rod controls the T-plate to drive the adjustable pressure piece and the roller assembly to move toward the bottom, and the rotary cylinder drives the adjustable pressure piece to drive the roller assembly to rotate, so that the sample is supported by the supporting round rod and the round roller. When the roller assembly rolls at the center of the top of the sample, it applies pressure, causing the center of the sample to bend toward the bottom, thereby achieving the effect of expanding the bending angle of the sample, which is conducive to obtaining data during the subsequent fatigue test of the sample and provides the basic requirements for simulating the working state; Secondly, in this solution, a circular roller supported by two ratchet assemblies is used to form a support at the bottom of the template. When the template is subjected to a force applied from the top to the bottom, the non-slip rubber sleeve on the outside of the circular roller contacts the template to provide friction. When the template bends from the center to the bottom, the circular roller drives the gear to rotate between the two buckle plates, and the teeth on the outside of the gear push the limit teeth to squeeze the second spring, completing the bending of the template. At the same time, the gear can be pressed between two adjacent teeth with the help of a limiting tooth supported by the second spring, limiting the circular roller from rotating away from the force direction of the template. This is conducive to achieving that when the center of the template bends toward the bottom, the ratchet assemblies on the two bearing assemblies support the circular roller through the gear to rotate only toward the bending part of the template, preventing the bearing assembly from moving in the horizontal plane during the pressure process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a metal plate bending fatigue testing device according to the present invention; Figure 2 This is a schematic diagram of the position structure of the testing pressure component and the load-bearing component of a metal plate bending fatigue testing device in a working state of the present invention; Figure 3 This is an exploded schematic diagram of an adjustable pressure member of a metal plate bending fatigue testing device according to the present invention; Figure 4 This is an exploded schematic diagram of a roller assembly of a metal plate bending fatigue testing device according to the present invention; Figure 5 This is a schematic diagram of the internal structure of a movable seat of a metal plate bending fatigue testing device according to the present invention; Figure 6 This is a schematic structural diagram of a load-bearing assembly of a metal plate bending fatigue testing device according to the present invention; Figure 7 This is an exploded schematic diagram of a ratchet assembly of a metal plate bending fatigue testing device according to the present invention; Figure 8 This is a planar schematic diagram of a metal sheet bending fatigue testing device of the present invention applying pressure to the gantry surface.

[0020] Reference numerals: 1. Gantry; 2. Test pressure assembly; 21. Guide rod; 22. T-plate; 23. Hydraulic push rod; 24. Roller assembly; 241. First wheel disc; 242. Second wheel disc; 243. Bearing; 25. Adjustable pressure member; 251. Movable seat; 252. Vertical arm; 253. Guide rod; 254. C-shaped buckle seat; 255. Positioning screw; 256. First spring; 257. Plate; 258. Control head; 259. Limiting long plate; 26. Rotary cylinder; 27. First slide; 28. Second slide; 29. ​​Angle seat; 210. Adapter shaft; 3. Test device bracket; 4. Bearing assembly; 41. Support rod; 42. Crossbar seat; 43. Vertical plate seat; 44. Round roller; 45. Adapter seat; 46. Ratchet assembly; 461. Gear; 462. Clamp plate; 463. Limiting tooth; 464. Limiting pin; 465. Support plate; 466. Second spring; 47. Third spring; 48. Support rod; 5. Sample; 6. Movable slot; 7. Limiting slot; 8. Storage slot. DETAILED DESCRIPTION

[0021] The technical solution in the embodiments of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows: Example 1: This embodiment introduces the specific structure of a metal plate bending fatigue testing device. Figure 1-Figure 5 As shown, it includes a gantry 1, a test device bracket 3, a test pressure assembly 2 arranged on the inner wall of the top of the gantry 1, and two bearing assemblies 4. The two bearing assemblies 4 are symmetrically arranged at the bottom of the test pressure assembly 2 and located on the inner side of the top of the test device bracket 3; like Figure 1 and Figure 2 As shown, the test pressure assembly 2 includes a hydraulic push rod 23, the bottom of the hydraulic push rod 23 is assembled and connected to a T-plate 22, one side of the bottom of the T-plate 22 is assembled and connected to a rotary cylinder 26, and the other side of the bottom of the T-plate 22 is provided with an adjustable pressure member 25, and the bottom of the adjustable pressure member 25 is provided with a roller assembly 24; The roller assembly 24 includes a first wheel disc 241 and a second wheel disc 242. The second wheel disc 242 is sleeve-connected to a bearing 243 on the side thereof adjacent to the first wheel disc 241. The bearing 243 is buckled to a C-shaped buckle seat 254 on the outside. The C-shaped buckle seat 254 is assembled and fixed to the vertical arm 252, so that the bearing 243 is fixed between the C-shaped buckle seat 254 and the bottom of the vertical arm 252. Bolts pass through the interior of the second wheel disc 242, the bearing 243, and the first wheel disc 241, and are threadedly connected to a nut, thereby assembling and fixing the first wheel disc 241 and the second wheel disc 242. The two bearing assemblies 4 each include a supporting rod 41 and a crossbar seat 42. Both ends of the supporting rod 41 and the crossbar seat 42 are integrally formed with a vertical plate seat 43. Two round rollers 44 are provided between the two supporting rods 41. Both ends of the two round rollers 44 are provided with a ratchet assembly 46. The outer surface of the round roller 44 is sleeved with an anti-slip rubber sleeve, and the top surface of the round roller 44 is flush with the top surface of the supporting rod 41. When the bending fatigue test of sample 5 is carried out, the working state of sample 5 is simulated first, that is, The hydraulic push rod 23 controls the T-plate 22 from top to bottom, driving the adjustable pressure member 25 and the roller assembly 24 to move toward the bottom and apply pressure to the top of the sample 5. The rotating cylinder 26 controls the adjustable pressure member 25 to drive the roller assembly 24 to roll on the top surface of the sample 5. As shown above, when simulating the working state of sample 5, it is mainly divided into two states: (1) When the hydraulic push rod 23 controls the T-plate 22 from top to bottom, driving the adjustable pressure member 25 and the roller assembly 24 to move toward the bottom, the template 5 is supported by the supporting rod 41 and the round roller 44 and bends from the center to the bottom, thereby achieving a small-angle bending effect of the template 5; (2) When the hydraulic push rod 23 controls the T-plate 22 from top to bottom to drive the adjustable pressure member 25 and the roller assembly 24 to move toward the bottom, and the rotary cylinder 26 drives the adjustable pressure member 25 to drive the roller assembly 24 to rotate, the template 5 is supported by the supporting rod 41 and the round roller 44, and is limited by the non-slip rubber sleeve on the outside of the round roller 44. When the roller assembly 24 rolls at the center of the top of the template 5, it applies pressure, causing the center of the template 5 to bend toward the bottom, which is conducive to achieving a large-angle bending effect of the template 5, thereby meeting the simulation effect of bending various angles of various types of templates 5; Secondly, in order to improve the stability of the hydraulic push rod 23 controlling the up and down movement of the T-plate 22, as shown in FIG. Figure 2 As shown, two guide rods 21 are provided inside the T-plate 22 on one side of the rotating cylinder 26. By fixing the top of the guide rods 21 to the top inner wall of the gantry 1, when the hydraulic push rod 23 controls the hydraulic push rod 23 to slide outside the two guide rods 21, the hydraulic push rod 23 can be assisted in controlling the track of the T-plate 22 to move up and down; Furthermore, in order to support the adjustable pressure member 25 to move up and down on the side of the bottom of the T-plate 22 away from the rotating cylinder 26, as shown in FIG. Figure 3As shown, one end of the rotating shaft of the rotating cylinder 26 passes through the bottom of the T-plate 22 and is pinned to a transfer shaft 210. The external pin of the transfer shaft 210 away from one end of 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 the vertical arm 252 is provided with a movable groove 6. By making the cross-sections of the first slide 27 and the second slide 28 both T-shaped, the top and bottom of the first slide 27 and the second slide 28 are both passed through together. After being assembled and fixed by means of bolts, the first slide 27 and the second slide 28 can be slidably connected to the interior of the movable groove 6 (i.e., the vertical arm 252 is slidably connected between the first slide 27 and the second slide 28), so that the vertical arm 252 can always be kept between the first slide 27 and the second slide 28, ensuring that the vertical arm 252 can be adjusted up and down. The rotation of the vertical arm 252 can be controlled by the rotary cylinder 26 through the adapter shaft 210, the first slide 27 and the second slide 28; At the same time, in order to ensure that the vertical arm 252 can always be at a fixed height when it moves between the first slide 27 and the second slide 28, as shown in FIG. Figure 3 and Figure 5 As shown, the surface of the side of the vertical arm 252 away from the T-plate 22 is provided with four corner seats 29 arranged in a rectangular shape, and the external assembly of the adapter shaft 210 away from the end of the hydraulic push rod 23 is fixed with a movable seat 251, and the interior of both ends of the movable seat 251 is provided with a guide rod 253, and the two guide rods 253 are provided with a plurality of equally spaced limiting grooves 7 on the faces. The four corner seats 29 are located at the four corners of the movable strip groove 6, and the two ends of the two guide rods 253 are respectively connected and fixed with the two corner seats 29 at the long sides. By making the multiple limiting grooves 7 on the two guide rods 253 correspond one to one, when the limiting long plate 259 is plugged into the two limiting grooves 7 in the corresponding state through the interior of the movable seat 251, the relative movement of the vertical arm 252 and the first slide 27 and the second slide 28 can be limited, thereby achieving the fixing effect of the vertical arm 252 and the first slide 27 and the second slide 28; In some examples, a positioning screw 255 passes through the center of the limiting long plate 259, and a first spring 256 and a plate 257 are sleeve-connected to the outside of one end of the positioning screw 255. A control head 258 is threadedly connected to the outside of one end of the positioning screw 255. A receiving slot 8 is formed inside the movable seat 251 on the side away from the vertical arm 252. The limiting long plate 259 is slidably connected to the interior of the receiving groove 8. When the plate 257 is assembled and fixed to the surface of the movable seat 251 on the side away from the vertical arm 252, the plate 257 and the limiting long plate 259 are located between the two ends of the first spring 256. The control head 258 and the first spring 256 are respectively located on both sides of the plate 257. The control head 258 and the first spring 256 can be supported between the limiting long plate 259 and the plate 257 by the first spring 256, so that the two ends of the limiting long plate 259 are stably located between the two corresponding limiting grooves 7 on the two guide rods 253, so that the vertical arm 252 and the first slide 27 and the second slide 28 remain fixed. At the same time, by pulling the control head 258, one end of the positioning screw 255 compresses the first spring 256 inside the limiting long plate 259, so that the limiting long plate 259 can be withdrawn from between the two guide rods 253, and then elastically restored to between the two guide rods 253 with the help of the compressed first spring 256.

[0022] The above design controls the T-plate 22 to drive the adjustable pressure member 25 and the roller assembly 24 to move toward the bottom under the cooperation of the T-plate 22 and the guide upright 21 from top to bottom by the hydraulic push rod 23, and applies pressure to the top of the template 5. In the process of controlling the adjustable pressure member 25 to drive the roller assembly 24 to rotate in cooperation with the rotary cylinder 26, the hydraulic push rod 23 controls the T-plate 22 to drive the adjustable pressure member 25 and the roller assembly 24 to move toward the bottom from top to bottom, and independently applies pressure to the template 5, so that it bends from the center to the bottom, thereby achieving a small-angle bending effect of the template 5; At the same time, the hydraulic push rod 23 is used to control the T-plate 22 from top to bottom to drive the adjustable pressure piece 25 and the roller assembly 24 to move toward the bottom, and the rotary cylinder 26 drives the adjustable pressure piece 25 to drive the roller assembly 24 to rotate. The template 5 is supported by the supporting round rod 41 and the round roller 44 (the rotation direction of the round roller 44 is limited by the ratchet assembly 46). It is limited by the non-slip rubber sleeve on the outside of the round roller 44, and the roller assembly 24 applies pressure when rolling at the center of the top of the template 5, so that the center of the template 5 bends toward the bottom, thereby achieving the effect of expanding the bending angle of the template 5. It is beneficial to use the two methods of bending the template 5 to provide the basic requirements for simulating the working state for the subsequent data acquisition during the fatigue test of the template 5.

[0023] Example 2: Based on Example 1, this example introduces the specific structure of the bearing assembly 4. Figure 2 、 Figures 6 to 8 As shown, a transfer seat 45 is provided on the side of the ratchet assembly 46 on the bearing assembly 4 close to the cross bar seat 42. A support rod 48 is integrally formed on the surface of the transfer seat 45 close to the cross bar seat 42. A third spring 47 is sleeve-connected to the outside of the support rod 48. The template 5 is mounted on top of two supporting round rods 41 and two round rollers 44, and the supporting long rod 48 is tilted. When the template 5 is subjected to pressure from the top to the bottom, the template 5 bends from the center to the bottom, which can cause the round rollers 44 to pressurize the ratchet assembly 46, so that the adapter 45 drives the supporting long rod 48 to be slidably connected to the inside of one end of the crossbar seat 42, compressing the third spring 47 between the adapter 45 and the crossbar seat 42. At the same time, with the help of the external non-slip rubber sleeve connected to the round roller 44, when the hydraulic push rod 23 controls the T-plate 22 from top to bottom to drive the adjustable pressure piece 25 and the roller assembly 24 to move toward the bottom, and the rotating cylinder 26 drives the adjustable pressure piece 25 to drive the roller assembly 24 to rotate, the template 5 is supported by the supporting rod 41 and the round roller 44, and is limited by the non-slip rubber sleeve on the outside of the round roller 44. When the roller assembly 24 rolls at the center of the top of the template 5, pressure is applied. The rotation direction of the round roller 44 can be limited by the ratchet assembly 46 to prevent the template 5 from moving on the top of the round roller 44 and the supporting rod 41, so as to adapt to the force tending to control the movement of the template 5 when the rotating cylinder 26 controls the adjustable pressure piece 25 to drive the roller assembly 24 to roll on the top of the template 5. As shown in the figure, the ratchet assembly 46 includes two symmetrical gusset plates 462, one end of the two gusset plates 462 is rotatably connected to a gear 461, and the top surface of the other end of the two gusset plates 462 is assembled and connected to a support plate 465. A limiting tooth 463 supported by a bolt passing through the interior of the two gusset plates 462 is provided between the support plate 465 and the gear 461, and a second spring 466 is provided between the outer side of the limiting tooth 463 and the support plate 465. The second spring 466 is supported at both ends against the support plate 465 and the limiting tooth 463, so that one end of the limiting tooth 463 can be supported to extend between two adjacent teeth of the gear 461. This allows the two ends to be pinned to the rollers 44 inside the two coaxial gears 461, and the gears 461 can only rotate in one direction. Secondly, by pinning the limit pin 464 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 limit pin 464 is pinned to the inside of the adapter seat 45, which helps to limit the rotation of the connection point between the adapter seat 45 and the two buckle plates 462.

[0024] The above design uses a round 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, the non-slip rubber sleeve on the outside of the round roller 44 contacts the template 5 to provide friction. When the template 5 bends from the center to the bottom, the friction between the template 5 and the non-slip rubber sleeve on the outside of the round roller 44 drives the round roller 44 to rotate between the two ratchet assemblies 46. During this process, the round roller 44 drives the gear 461 to rotate between the two buckle plates 462, and uses the teeth on the outside of the gear 461 to push the limiting tooth 463 to squeeze the second spring 466; when rotating in the opposite direction, the gear 461 uses the limiting tooth 463 supported by the second spring 466 to press between two adjacent teeth, limiting the round roller 44 from rotating away from the force direction of the template 5, which is conducive to achieving that when the center of the template 5 bends toward the bottom, the ratchet assemblies 46 on the two bearing assemblies 4 support the round roller 44 through the gear 461 to rotate only toward the bending part of the template 5, preventing the bearing assembly 4 from moving in the horizontal plane during the pressure process.

[0025] Finally, it should be noted that the above embodiments are merely examples for the purpose of illustrating the present invention and are not intended to limit the embodiments. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to provide an exhaustive list of all embodiments. However, obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A metal sheet bending fatigue testing device, characterized in that: include: Gantry (1); Test device bracket (3); A test pressure component (2) is arranged on the top inner wall of the gantry (1); Two bearing assemblies (4) are symmetrically arranged at the bottom of the test pressure assembly (2) and located on the inner side of the top of the test device bracket (3); The test pressure assembly (2) includes a hydraulic push rod (23), the bottom of the hydraulic push rod (23) is assembled and connected to a T-plate (22), one side of the bottom of the T-plate (22) is assembled and connected to a rotary cylinder (26), the other side of the bottom of the T-plate (22) is provided with an adjustable pressure member (25), and the bottom of the adjustable pressure member (25) is provided with a roller assembly (24); The two bearing assemblies (4) each include a supporting round rod (41) and a crossbar seat (42), both ends of the supporting round rod (41) and the crossbar seat (42) are integrally formed with a vertical plate seat (43), two round rollers (44) are provided between the two supporting round rods (41), both ends of the two round rollers (44) are provided with a ratchet assembly (46), a transfer seat (45) is provided on a side of the ratchet assembly (46) close to the crossbar seat (42), a supporting long rod (48) is integrally formed on a surface of a side of the transfer seat (45) close to the crossbar seat (42), and a third spring (47) is sleeve-connected to the outside of the supporting long rod (48); The supporting long rod (48) is slidably connected to the inside of one end of the crossbar seat (42), and the template (5) is mounted on the top of the two supporting round rods (41) and the two round rollers (44). The hydraulic push rod (23) controls the T-plate (22) from the top to the bottom, drives the adjustable pressure member (25) and the roller assembly (24) to move toward the bottom, and applies pressure to the top of the template (5). The rotating cylinder (26) controls the adjustable pressure member (25) to drive the roller assembly (24) to roll on the top surface of the template (5).

2. The metal sheet bending fatigue testing device according to claim 1, characterized in that: The T-plate (22) is located on one side of the rotary cylinder (26) and is internally provided with two guide uprights (21). The tops of the guide uprights (21) are fixed to the top inner wall of the gantry (1). The hydraulic push rod (23) controls the hydraulic push rod (23) to slide outside the two guide uprights (21).

3. The metal sheet bending fatigue testing device according to claim 1, characterized in that: 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 transfer shaft (210); the outer portion of the transfer shaft (210) away from the adjustable pressure member (25) is pinned to a first slide seat (27) and a second slide seat (28); The adjustable pressure member (25) includes a vertical arm (252), and a movable groove (6) is formed on the top of the vertical arm (252); The cross-sections of the first slide (27) and the second slide (28) are both T-shaped, and the tops and bottoms of the first slide (27) and the second slide (28) are assembled and fixed by means of bolts passing through them. The first slide (27) and the second slide (28) are slidably connected to the inside of the movable strip groove (6) and keep the vertical arm (252) always between the first slide (27) and the second slide (28).

4. The metal sheet bending fatigue testing device according to claim 3, characterized in that: The vertical arm (252) is provided with four corner seats (29) arranged in a rectangular shape on a surface of one side away from the T-plate (22); the external portion of the adapter shaft (210) away from the hydraulic push rod (23) is fixed with a movable seat (251); both ends of the movable seat (251) are provided with guide rods (253); and the two guide rods (253) are provided with a plurality of equally spaced limiting grooves (7) facing each other; The plurality of limit slots (7) on the two guide rods (253) correspond to each other one by one, and the limit long plate (259) is plug-connected to the two limit slots (7) in the corresponding state through the inside of the movable seat (251), and the four corner seats (29) are located at the four corners of the movable strip groove (6), and both ends of the two guide rods (253) are respectively connected and fixed to the two corner seats (29) at the long side.

5. The metal sheet bending fatigue testing device according to claim 4, characterized in that: A positioning screw (255) passes through the center of the position-limiting long plate (259); a first spring (256) and a plate (257) are connected to the outside of one end of the positioning screw (255) in a sleeve-type manner; a control head (258) is connected to the outside of one end of the positioning screw (255) in a threaded manner; and a receiving groove (8) is provided inside the movable seat (251) on a side away from the vertical arm (252); The limiting long plate (259) is slidably connected to the inside of the receiving groove (8), the plate (257) is assembled and fixed to the surface of the movable seat (251) away from the vertical arm (252), the plate (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 respectively located on both sides of the plate (257).

6. The metal sheet bending fatigue testing device according to claim 1, characterized in that: The supporting long rod (48) is arranged at an angle, the outside of the round roller (44) is sleeved with a non-slip rubber sleeve, and the top surface of the round roller (44) is flush with the top surface of the supporting round rod (41).

7. The metal sheet bending fatigue testing device according to claim 1, characterized in that: The ratchet assembly (46) comprises two symmetrical buckle plates (462), one end of the two buckle plates (462) being rotatably connected to a gear (461), and the top surfaces of the other ends of the two buckle plates (462) being assembled and connected to a support plate (465), and a limiting tooth (463) supported by a bolt passing through the interior 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), and one end of the supporting limiting tooth (463) extends between two adjacent teeth of the gear (461). Both ends of the circular roller (44) are pinned to the inside of the two coaxial gears (461). A limiting pin (464) is pinned between one end 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 (464) is pinned to the inside of the adapter seat (45).

8. The metal sheet bending fatigue testing device according to claim 1, characterized in that: The roller assembly (24) comprises a first wheel disc (241) and a second wheel disc (242); the second wheel disc (242) is sleeve-connected to a bearing (243) on the outside of a side close to the first wheel disc (241); and the bearing (243) is buckled with a C-shaped buckle seat (254) on the outside. The C-shaped buckle seat (254) is assembled and fixed with the vertical arm (252), so that the bearing (243) is fixed between the C-shaped buckle seat (254) and the bottom of the vertical arm (252), and the bolt passes through the inside of the second wheel disc (242), the bearing (243) and the first wheel disc (241), and the nut is threadedly connected to assemble and fix the first wheel disc (241) and the second wheel disc (242).

9. The metal sheet bending fatigue testing device according to claim 1, characterized in that: The hydraulic push rod (23) controls the T-plate (22) from top to bottom, driving the adjustable pressure member (25) and the roller assembly (24) to move toward the bottom, so that the template (5) is bent from the center to the bottom under the support of the supporting round rod (41) and the round roller (44).

10. The metal sheet bending fatigue testing device according to claim 6, characterized in that: The hydraulic push rod (23) controls the T-plate (22) from the top to the bottom, driving the adjustable pressure member (25) and the roller assembly (24) to move toward the bottom, and the rotary cylinder (26) drives the adjustable pressure member (25) to drive the roller assembly (24) to rotate, so that the template (5) is supported by the supporting rod (41) and the round roller (44), and is limited by the anti-slip rubber sleeve on the outside of the round roller (44). The roller assembly (24) applies pressure when rolling on the center of the top of the template (5), so that the center of the template (5) bends toward the bottom.

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