Fatigue testing machine and testing method thereof

Abstract

The invention provides a fatigue testing machine and a testing method thereof, and relates to the technical field of fatigue testing equipment.The fatigue testing machine comprises a control device, a clamping device, a fixing device, an adjusting device and a load bearing structure, and the clamping device is electrically connected with the control device; the fixing device is used for fixing sample positions; the fixing device is arranged on the adjusting device and is movably connected with the adjusting device; the load bearing structures are arranged on the two sides of the adjusting device and are detachably connected with the sample; wherein the clamping device comprises a lifting device, a servo motor and a pneumatic clamp, the lifting device is fixedly connected with the pneumatic clamp, the servo motor is arranged on the pneumatic clamp and fixedly connected with the pneumatic clamp, and the servo motor and the pneumatic clamp are electrically connected with the control device. The fatigue testing machine can better simulate the stress state and the fatigue performance of the shoelace rotating buckle in the actual use process, further accurately evaluate the durability and the fatigue life of the shoelace rotating buckle, and improve the accuracy of a fatigue test result.

Description

Technical Field

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

[0002] With the rapid development of the footwear market and the increasing demand of consumers for product quality, the quality and performance of shoelace swivels, as important accessories of footwear products, have become the focus of consumers' attention. Shoelace swivels are not only related to the aesthetics of shoes, but also directly affect consumers' wearing experience and safety. At present, the quality inspection and performance evaluation methods for shoelace swivels in the market are still imperfect. In the existing technology, tensile testing machines are often used to perform strength tests on shoelaces to evaluate the strength of the combination of button parts and ropes.

[0003] However, this method can only simulate the stress of shoelaces in a certain direction, and cannot fully reflect the complex stress state and fatigue performance of shoelace swivels during actual use. In addition, the tensile testing machine cannot simulate the wear and aging of shoelace swivels during repeated rotation, so it is impossible to accurately evaluate their durability and fatigue life. Summary of the invention

[0004] Based on this, in order to solve the problem that the prior art cannot better simulate the stress state and fatigue performance of the shoelace swivel buckle during actual use, one of the purposes of the present invention is to provide a fatigue testing machine, and its specific technical solution is as follows: A fatigue testing machine comprises a control device, a clamping device, a fixing device, an adjusting device and a weight-bearing structure, wherein the clamping device is electrically connected to the control device; the fixing device is used to fix the position of the sample; the fixing device is arranged on the adjusting device and is movably connected to the adjusting device; the weight-bearing structure is arranged on both sides of the adjusting device, and the weight-bearing structure is detachably connected to the sample; wherein the clamping device comprises a lifting device, a servo motor and a pneumatic clamp, the lifting device is fixedly connected to the pneumatic clamp, the servo motor is arranged on the pneumatic clamp and is fixedly connected to the pneumatic clamp, and the servo motor and the pneumatic clamp are electrically connected to the control device respectively.

[0005] Further, the lifting device includes a first rotating wheel, a first ball screw, a guide rod and a movable plate, the first rotating wheel is fixedly connected to one end of the first ball screw, the guide rod is arranged parallel to the first ball screw, the movable plate is sleeved on the first ball screw and rotatably connected to the first ball screw, the movable plate is sleeved on the guide rod and slidably connected to the guide rod, and the pneumatic clamp is fixedly connected to the movable plate.

[0006] Further, the clamping device includes a fine-tuning device, which is slidably connected to the lifting device, and the fine-tuning device is fixedly connected to the pneumatic clamp. The fine-tuning device includes a connecting plate, a fine-tuning seat and a threaded rod. One end of the connecting plate is slidably connected to the lifting device, and one end of the connecting plate away from the lifting device is fixedly connected to the pneumatic clamp. The fine-tuning seat is arranged on the connecting plate and fixedly connected to the connecting plate. A connecting hole is provided on the connecting plate, and a fine-tuning hole is provided on the fine-tuning seat. The connecting holes are arranged corresponding to the fine-tuning holes, and the threaded rod passes through the fine-tuning holes and is threadedly connected to the connecting holes.

[0007] Furthermore, the pneumatic clamp includes a driving cylinder, a rotating mechanism and a clamping assembly, the driving cylinder is connected to the clamping assembly and is used to control the clamping and releasing actions of the clamping assembly, the clamping assembly is movably connected to the rotating mechanism, the driving cylinder is fixedly connected to the lifting device, and the servo motor is arranged above the driving cylinder and is connected to the rotating mechanism through a transmission mechanism, and is used to drive the rotating mechanism to drive the clamping assembly and the sample to rotate.

[0008] Furthermore, the clamping assembly includes a claw and a clamping arm, the claw is fixedly connected to the driving cylinder, the clamping arm is fixedly connected to the claw, and a plurality of clamping teeth are provided on the clamping arm. When it is necessary to clamp the sample, compressed air is input into the air inlet of the driving cylinder through the control device, so that the piston rod in the driving cylinder moves forward, thereby pushing the claw to approach the sample and clamp it; when it is necessary to release the sample, the control device will switch the output direction of the compressed air or stop supplying air to the driving cylinder, so that the piston rod in the driving cylinder moves backward under the action of air pressure, thereby driving the claw away from the sample and releasing it.

[0009] Furthermore, the fixing device includes a sliding seat, a mounting seat, an adjusting block and a locking piece, the mounting seat is fixedly connected to the sliding seat, the mounting seat is provided with a sliding groove, the adjusting block is slidably connected to the sliding groove, the locking piece passes through the adjusting block and is detachably connected to the mounting seat, the adjusting block is used to limit the position of the sample, and the sliding seat is provided on the adjusting device and is movably connected to the adjusting device.

[0010] Furthermore, the adjusting device includes a second rotating wheel, a second ball screw, a guide seat and a guide rod, the second rotating wheel is fixedly connected to one end of the second ball screw, the end of the second ball screw away from the second rotating wheel is rotatably connected to the guide seat through a bearing, the guide rod is arranged in the guide seat and fixedly connected to the guide seat, the fixing device is sleeved on the second ball screw and rotatably connected to the second ball screw, and the fixing device is sleeved on the guide rod and slidably connected to the guide rod.

[0011] Furthermore, the load-bearing structure includes a fixed seat, a guide column, a weight and a connecting seat, the guide column is provided with a limited position head, the guide column is detachably connected to the fixed seat, the weight is sleeved on the guide column and is slidably connected to the guide column, the connecting seat is arranged at the center of the weight, the weight is sleeved on the connecting seat, a connecting ring is provided on the connecting seat, and the connecting ring is detachably connected to the sample.

[0012] Furthermore, it includes a pulley device, which is fixedly connected to the fixing device. The pulley device includes a fixing frame, a connecting rod, a limiting seat and a pulley. The fixing frame is fixedly connected to the fixing device, one end of the connecting rod is fixedly connected to the fixing frame, the limiting seat is fixedly connected to one end of the connecting rod away from the fixing frame, and the pulley is rotatably connected to the limiting seat.

[0013] Another object of the present invention is to provide a testing method for a fatigue testing machine.

[0014] A test method for a fatigue testing machine, applied to the fatigue testing machine as described above, comprises the following steps: Lifting and positioning: operate the lifting device to drive the pneumatic clamp to rise, loosen the fixture, operate the adjustment device to move the fixture so that the sample placement position of the fixture is on the same center line as the pneumatic clamp; Sample installation: Place the sample on the fixture and tighten the fixture; Sample preparation: open the sample rotating buckle, stretch the sample rope to the limit length, tie the sample rope to the load-bearing structure, and control the pneumatic clamp to stably grasp the sample rotating buckle; Parameter setting: Set the parameters required for the test through the control device, including rotation speed, weight, and number of tests; Test cycle: The pneumatic clamp presses the rotary buckle to lock it, and the servo motor drives the pneumatic clamp to rotate, so that the load-bearing structure is lifted to the preset height. When the preset torque value is reached, the pneumatic clamp will automatically open, so that the sample rotary buckle is unlocked, and the load-bearing structure will fall due to gravity. At the same time, the sample rope will be released to its maximum length. The above cycle process is repeated until the preset number of tests is reached or the sample is fatigued.

[0015] Compared with the prior art, the beneficial effect of the present invention is that the fatigue testing machine of the present invention is responsible for receiving user instructions, controlling the operation of each functional component, and collecting, processing and displaying test data by setting a control device. By setting a clamping device, the clamping device includes a lifting device, a servo motor and a pneumatic clamp. The lifting device is used to adjust the height of the pneumatic clamp to ensure that the pneumatic clamp can accurately clamp the sample; the servo motor provides rotational power for the pneumatic clamp, and can collect torque values, and can monitor the torque changes during rotation in real time; the pneumatic clamp controls the clamping force through air pressure to ensure that the sample will not fall off or move during the test. By setting a fixing device, it is used to fix the sample position and can clamp shoelace swivel buckles of different sizes. By setting an adjustment device, it is used to adjust the position of the fixing device and the sample to ensure the accurate alignment of the sample with the pneumatic clamp. By setting a load-bearing structure, it is used to simulate the force conditions of the sample in actual use, which helps to more accurately evaluate the fatigue performance of the sample. The fatigue testing machine of the present invention can better simulate the stress state and fatigue performance of the shoelace swivel buckle during actual use, thereby accurately evaluating its durability and fatigue life, thereby improving the accuracy of the fatigue test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention may be further understood from the following description in conjunction with the accompanying drawings, in which the components are not necessarily drawn to scale, but emphasis is placed on illustrating the principles of the embodiments, and in different views, the same reference numerals designate corresponding parts.

[0017] Figure 1 is a structural schematic diagram of a fatigue testing machine according to an embodiment of the present invention; Figure 2 It is a partial structural schematic diagram of a fatigue testing machine according to an embodiment of the present invention; Figure 3 yes Figure 2 Side view of Figure 4 yes Figure 2 Schematic diagram of the enlarged structure; Figure 5 is a schematic structural diagram of a clamping assembly according to an embodiment of the present invention; Figure 6 is an exploded view of a fine-tuning device according to an embodiment of the present invention; Figure 7 is a schematic structural diagram of a fixing device according to an embodiment of the present invention; Figure 8 is a schematic structural diagram of an adjusting device according to an embodiment of the present invention; Fig. 9 is a structural schematic diagram of a load-bearing structure according to an embodiment of the present invention; Fig.10It is a schematic flow chart of a test method of a fatigue testing machine according to an embodiment of the present invention; Fig.11 It is a flowchart of a maximum torque testing method according to an embodiment of the present invention.

[0018] Description of reference numerals: 1. Control device; 2. Clamping device; 21. Lifting device; 211. First rotating wheel; 212. First ball screw; 213. Guide rod; 214. Movable plate; 22. Servo motor; 23. Pneumatic clamp; 231. Driving cylinder; 232. Rotating mechanism; 233. Clamping assembly; 2331. Claw; 2332. Clamping arm; 2333. Clamping teeth; 24. Fine-tuning device; 241. Connecting plate; 2411. Connecting hole; 242. Fine-tuning seat; 2421. Fine-tuning hole; 243. Threaded rod; 3. Fixing Fixed device; 31. Sliding seat; 32. Mounting seat; 321. Slide groove; 322. Eyelet; 323. Sample placement position; 33. Adjustment block; 34. Locking piece; 4. Adjustment device; 41. Second rotating wheel; 42. Second ball screw; 43. Guide seat; 44. Guide rod; 5. Load-bearing structure; 51. Fixed seat; 52. Guide column; 521. Limiting head; 53. Weight; 54. Connecting seat; 541. Connecting ring; 6. Pulley device; 61. Fixed frame; 62. Connecting rod; 63. Limiting seat; 64. Pulley. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the adsorption scope of the present invention.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] The “first” and “second” mentioned in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0023] like Figure 1-Figure 2 As shown, a fatigue testing machine in one embodiment of the present invention includes a control device 1, a clamping device 2, a fixing device 3, an adjusting device 4 and a weight-bearing structure 5. The clamping device 2 is electrically connected to the control device 1; the fixing device 3 is used to fix the sample position; the fixing device 3 is arranged on the adjusting device 4 and is movably connected to the adjusting device 4; the weight-bearing structure 5 is arranged on both sides of the adjusting device 4, and the weight-bearing structure 5 is detachably connected to the sample; wherein, the clamping device 2 includes a lifting device 21, a servo motor 22 and a pneumatic clamp 23, the lifting device 21 is fixedly connected to the pneumatic clamp 23, the servo motor 22 is arranged on the pneumatic clamp 23 and is fixedly connected to the pneumatic clamp 23, and the servo motor 22 and the pneumatic clamp 23 are electrically connected to the control device 1 respectively. By setting the control device 1, it is responsible for receiving user instructions, controlling the operation of each functional component, and collecting, processing and displaying test data. By setting a clamping device 2, the clamping device 2 includes a lifting device 21, a servo motor 22 and a pneumatic clamp 23. The lifting device 21 is used to adjust the height of the pneumatic clamp 23 to ensure that the pneumatic clamp 23 can accurately clamp the sample; the servo motor 22 provides rotational power for the pneumatic clamp 23, and can collect torque values, and can monitor the torque changes during the rotation process in real time; the pneumatic clamp 23 controls the clamping force through air pressure to ensure that the sample will not fall off or move during the test. By setting a fixing device 3, it is used to fix the sample position and can clamp shoelace swivel buckles of different sizes. By setting an adjustment device 4, it is used to adjust the position of the fixing device 3 and the sample to ensure that the sample is accurately aligned with the pneumatic clamp 23. By setting a weight-bearing structure 5, it is used to simulate the force of the sample in actual use, which helps to more accurately evaluate the fatigue performance of the sample. Its weight and shape can be adjusted according to test requirements.

[0024] See also Figure 3As a preferred embodiment of the present invention, it may also have the following additional technical features: the lifting device 21 includes a first rotating wheel 211, a first ball screw 212, a guide rod 213 and a movable plate 214, the first rotating wheel 211 is fixedly connected to one end of the first ball screw 212, the guide rod 213 is arranged parallel to the first ball screw 212, the movable plate 214 is sleeved on the first ball screw 212 and is rotatably connected to the first ball screw 212, the movable plate 214 is sleeved on the guide rod 213 and is slidably connected to the guide rod 213, and the pneumatic clamp 23 is fixedly connected to the movable plate 214. When the first rotating wheel 211 is manually rotated, the first ball screw 212 will be driven to rotate, so that the rotational motion can be efficiently converted into linear motion, while reducing friction and wear. The guide rod 213 is used to provide additional support and guidance for the movable plate 214 to ensure that the movable plate 214 maintains stable linear motion during the lifting process. When the first ball screw 212 rotates, the movable plate 214 will move in a straight line along the first ball screw 212 and the guide rod 213. When the movable plate 214 is lifted or lowered, the pneumatic clamp 23 will also be lifted or lowered accordingly.

[0025] As a preferred embodiment of the present invention, it may also have the following additional technical features: the pneumatic clamp 23 includes a driving cylinder 231, a rotating mechanism 232 and a clamping assembly 233, the driving cylinder 231 is connected to the clamping assembly 233, and is used to control the clamping and releasing actions of the clamping assembly 233. When the driving cylinder 231 receives a pneumatic signal, it pushes or pulls the piston rod inside it, thereby driving the clamping assembly 233 to perform a clamping or releasing operation. The clamping assembly 233 is movably connected to the rotating mechanism 232, the driving cylinder 231 is fixedly connected to the lifting device 21, and the servo motor 22 is arranged above the driving cylinder 231 and connected to the rotating mechanism 232 through a transmission mechanism (not shown in the figure), and is used to drive the rotating mechanism 232 to drive the clamping assembly 233 and the sample to rotate. The pneumatic clamp 23 realizes accurate clamping, release and rotation of the sample through the coordinated work of the driving cylinder 231 and the servo motor 22. The design of the clamping assembly 233 is determined according to the shape, size and material of the sample to ensure the stability and reliability of the clamping. The transmission mechanism can transmit the power of the servo motor 22 to the rotating mechanism 232 through gears or belts, etc. The transmission mechanism is a prior art and will not be described in detail here. In this embodiment, the driving cylinder 231 and the rotating mechanism 232 are electrically connected to the control device 1.

[0026] See also Figure 5As a preferred embodiment of the present invention, it may also have the following additional technical features: the clamping assembly 233 includes a claw 2331 and a clamp arm 2332, the claw 2331 is fixedly connected to the driving cylinder 231, the clamp arm 2332 is fixedly connected to the claw 2331, and the clamp arm 2332 is provided with a plurality of clamp teeth 2333 for increasing the friction between the sample and the clamp arm 2332, thereby ensuring the firmness of the clamping. When it is necessary to clamp the sample, compressed air is input to the air inlet of the driving cylinder 231 through the control device 1, so that the piston rod in the driving cylinder 231 moves forward, thereby pushing the claw 2331 to approach the sample and clamp it; when it is necessary to release the sample, the control device 1 will switch the output direction of the compressed air or stop supplying air to the driving cylinder 231, so that the piston rod in the driving cylinder 231 moves backward under the action of air pressure, thereby driving the claw 2331 away from the sample and releasing it.

[0027] See also Figure 6 As a preferred embodiment of the present invention, it may also have the following additional technical features: the clamping device 2 includes a fine-tuning device 24, the fine-tuning device 24 is slidably connected to the lifting device 21, the fine-tuning device 24 is fixedly connected to the pneumatic clamp 23, the fine-tuning device 24 includes a connecting plate 241, a fine-tuning seat 242 and a threaded rod 243, one end of the connecting plate 241 is slidably connected to the lifting device 21, the end of the connecting plate 241 away from the lifting device 21 is fixedly connected to the pneumatic clamp 23, the fine-tuning seat 242 is arranged on the connecting plate 241 and connected to the connecting plate 24 The connecting plate 241 is provided with a connecting hole 2411, the fine-adjusting seat 242 is provided with a fine-adjusting hole 2421, the connecting hole 2411 and the fine-adjusting hole 2421 are arranged correspondingly, the threaded rod 243 passes through the fine-adjusting hole 2421 and is threadedly connected with the connecting hole 2411. By rotating the threaded rod 243, due to the interaction of the threads, the fine-adjusting device 24 will rise or fall along the track of the lifting device 21, so that the pneumatic clamp 23 can rise and fall appropriately, ensuring that the pneumatic clamp 23 maintains a certain distance from the shoelace rotating buckles of different sizes.

[0028] See also Figure 7As a preferred embodiment of the present invention, it may also have the following additional technical features: the fixing device 3 includes a sliding seat 31, a mounting seat 32, an adjusting block 33 and a locking member 34. The mounting seat 32 is fixedly connected to the sliding seat 31. A slide groove 321 is provided on the mounting seat 32. The adjusting block 33 is slidably connected to the slide groove 321, allowing the adjusting block 33 to move freely in the slide groove 321, and is used to adjust it according to samples of different sizes. The locking member 34 passes through the adjusting block 33 and is detachably connected to the mounting seat 32, and is used to fix the position of the adjusting block 33. The adjusting block 33 is used to limit the position of the sample. When the adjusting block 33 slides to the desired position, the locking member 34 will be tightened, so that the adjusting block 33 is firmly fixed in the slide groove 321, thereby limiting the position of the sample, which helps to reduce the error in the test process and improve the accuracy of the test. The sliding seat 31 is arranged on the adjusting device 4 and is movably connected to the adjusting device 4. In this embodiment, a plurality of shoe eyes 322 are provided on the mounting seat 32, which are used to perform a maximum torque test on the rope.

[0029] See also Figure 8 As a preferred embodiment of the present invention, it may also have the following additional technical features: the adjusting device 4 includes a second rotating wheel 41, a second ball screw 42, a guide seat 43 and a guide rod 44, the second rotating wheel 41 is fixedly connected to one end of the second ball screw 42, the end of the second ball screw 42 away from the second rotating wheel 41 is rotatably connected to the guide seat 43 through a bearing, the guide rod 44 is arranged in the guide seat 43 and fixedly connected to the guide seat 43, the fixing device 3 is sleeved on the second ball screw 42 and rotatably connected to the second ball screw 42, and the fixing device 3 is sleeved on the guide rod 44 and slidably connected to the guide rod 44. In this embodiment, the sliding seat 31 is sleeved on the second ball screw 42 and is rotatably connected to the second ball screw 42. The fixing device 3 is sleeved on the guide rod 44 and is slidably connected to the guide rod 44. When the second rotating wheel 41 is manually rotated, the second ball screw 42 will be driven to rotate, so that the rotational motion can be efficiently converted into linear motion, while reducing friction and wear. The guide rod 44 is used to provide additional support and guidance for the sliding seat 31 to ensure that the sliding seat 31 maintains stable linear motion during the translation process. When the second ball screw 42 rotates, the sliding seat 31 will move in a straight line along the second ball screw 42 and the guide rod 44. When the sliding seat 31 moves, the sample will also move with it.

[0030] See also Fig. 9As a preferred embodiment of the present invention, it may also have the following additional technical features: the load-bearing structure 5 includes a fixed seat 51, a guide column 52, a weight 53 and a connecting seat 54. A limit head 521 is provided on the guide column 52 to prevent the weight 53 from falling off during the sliding process to ensure the safety of the test. The guide column 52 is detachably connected to the fixed seat 51. The weight 53 is sleeved on the guide column 52 and slidably connected to the guide column 52. The connecting seat 54 is set at the center of the weight 53. The weight 53 is sleeved on the connecting seat 54. A connecting ring 541 is provided on the connecting seat 54, and the connecting ring 541 is detachably connected to the sample. In this embodiment, guide columns 52 of different lengths can be installed, disassembled and replaced to adapt to weights 53 of different weights and test requirements. When the shoelace swivel buckle is subjected to a fatigue test, it is tied to the connecting ring 541 by a rope and tied tightly.

[0031] See also Figure 4 As a preferred embodiment of the present invention, it may also have the following additional technical features: including a pulley device 6, the pulley device 6 is fixedly connected to the fixing device 3, reducing the friction between the rope and the fixing device 3, which may cause the rope to break. The pulley device 6 includes a fixing frame 61, a connecting rod 62, a limiting seat 63 and a pulley 64. The fixing frame 61 is fixedly connected to the fixing device 3, one end of the connecting rod 62 is fixedly connected to the fixing frame 61, the limiting seat 63 is fixedly connected to the end of the connecting rod 62 away from the fixing frame 61, and the pulley 64 is rotatably connected to the limiting seat 63. The main function of the pulley 64 is to guide the rope and reduce the friction between it and the fixing device 3. When the rope passes around the pulley 64, the pulley 64 will rotate with the movement of the rope, thereby reducing the friction coefficient of the contact surface between the rope and the fixing device 3, effectively extending the service life of the rope and reducing the risk of breakage caused by friction.

[0032] See also Fig.10 This embodiment also provides a test method of a fatigue testing machine, which is applied to the fatigue testing machine as described above, and includes the following steps: S1. Lifting and positioning: operate the lifting device 21 to drive the pneumatic clamp 23 to rise, release the fixture 3, operate the adjustment device 4 to move the fixture 3, so that the sample placement position 323 of the fixture 3 and the pneumatic clamp 23 are on the same center line.

[0033] S2. Sample installation: Place the sample on the fixture 3 and tighten the fixture 3 to ensure that the sample does not move or fall off during the test.

[0034] S3. Sample preparation: open the sample rotating buckle, stretch the sample rope to the maximum length to ensure that the stress condition of the sample can be fully simulated during the test, tie the sample rope to the weight-bearing structure 5, and control the pneumatic clamp 23 to stably grasp the sample rotating buckle; in this embodiment, the fine-tuning device 24 can also be operated to ensure that the pneumatic clamp 23 maintains a certain distance from the sample to avoid interference during the test. The sample rope is then tied to the connecting ring 541 through the pulley device 6, which helps to reduce the friction between the rope and the fixing device 3 and improve the accuracy of the test.

[0035] S4. Parameter setting: The parameters required for the test are set through the control device 1, and the parameters include rotation speed, weight of the weight 53, and number of tests; the setting of these parameters should be determined according to the specific test requirements and characteristics of the sample.

[0036] S5. Test cycle: the pneumatic clamp 23 presses the rotary buckle to lock it, and the servo motor 22 drives the pneumatic clamp 23 to rotate, so that the load-bearing structure 5 is lifted to a preset height. When the preset torque value is reached, the pneumatic clamp 23 will automatically open, so that the sample rotary buckle is unlocked, and the load-bearing structure 5 will fall due to gravity. At the same time, the sample rope will be released to its maximum length. The above cycle process is repeated until the preset number of tests is reached or the sample is fatigued.

[0037] See also Fig.11 This embodiment also provides a maximum torque test method, which is applied to the fatigue testing machine as described above, and includes the following steps: S1. Lifting and positioning: operate the lifting device 21 to drive the pneumatic clamp 23 to rise, release the fixture 3, operate the adjustment device 4 to move the fixture 3, so that the sample placement position 323 of the fixture 3 and the pneumatic clamp 23 are on the same center line.

[0038] S2. Sample installation: Place the sample on the fixture 3 and tighten the fixture 3 to ensure that the sample does not move or fall off during the test.

[0039] S3. Sample preparation: open the sample rotating buckle, stretch the sample rope to the maximum length, tie the rope to the shoe eye 322, tie a knot and tighten it, and control the pneumatic clamp 23 to stably grasp the sample rotating buckle; in this embodiment, the fine-tuning device 24 can also be operated to ensure that the pneumatic clamp 23 maintains a certain distance from the sample to avoid interference during the test.

[0040] S4. Parameter setting: The parameters required for the test are set through the control device 1. The setting of these parameters should be determined according to the specific test requirements and the characteristics of the sample.

[0041] S5. Test operation: The pneumatic clamp 23 presses the rotating buckle to lock it, and the servo motor 22 drives the pneumatic clamp 23 to rotate until the preset test times are reached or the sample is damaged.

[0042] The fatigue testing machine of this embodiment has a reasonable structural design and is easy to use. This structure can also be used for other equipment with similar usage requirements. In this embodiment, the fatigue testing machine can better simulate the stress state and fatigue performance of the shoelace swivel buckle during actual use, and then accurately evaluate its durability and fatigue life, thereby improving the accuracy of the fatigue test results.

[0043] In the description of the above embodiments, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, "several" and "multiple" mean more than one, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" and "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction between the combinations of these technical features, they should be considered to be within the scope recorded in this specification.

[0045] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A fatigue testing machine, characterized in that: include: Control devices; A clamping device, the clamping device is electrically connected to the control device; A fixing device, the fixing device is used to fix the position of the sample; An adjusting device, wherein the fixing device is arranged on the adjusting device and is movably connected to the adjusting device; A weight-bearing structure, the weight-bearing structure is arranged on both sides of the adjusting device, and the weight-bearing structure is detachably connected to the sample; Among them, the clamping device includes a lifting device, a servo motor and a pneumatic clamp, the lifting device is fixedly connected to the pneumatic clamp, the servo motor is arranged on the pneumatic clamp and fixedly connected to the pneumatic clamp, and the servo motor and the pneumatic clamp are electrically connected to the control device respectively.

2. The fatigue testing machine according to claim 1, characterized in that: The lifting device includes a first rotating wheel, a first ball screw, a guide rod and a movable plate, the first rotating wheel is fixedly connected to one end of the first ball screw, the guide rod is arranged parallel to the first ball screw, the movable plate is sleeved on the first ball screw and is rotatably connected to the first ball screw, the movable plate is sleeved on the guide rod and is slidably connected to the guide rod, and the pneumatic clamp is fixedly connected to the movable plate.

3. The fatigue testing machine according to claim 1, characterized in that: The clamping device includes a fine-tuning device, which is slidably connected to the lifting device, and the fine-tuning device is fixedly connected to the pneumatic clamp. The fine-tuning device includes a connecting plate, a fine-tuning seat and a threaded rod. One end of the connecting plate is slidably connected to the lifting device, and one end of the connecting plate away from the lifting device is fixedly connected to the pneumatic clamp. The fine-tuning seat is arranged on the connecting plate and fixedly connected to the connecting plate. A connecting hole is provided on the connecting plate, and a fine-tuning hole is provided on the fine-tuning seat. The connecting hole is arranged corresponding to the fine-tuning hole, and the threaded rod passes through the fine-tuning hole and is threadedly connected to the connecting hole.

4. The fatigue testing machine according to claim 1, characterized in that: The pneumatic clamp includes a driving cylinder, a rotating mechanism and a clamping assembly. The driving cylinder is connected to the clamping assembly and is used to control the clamping and releasing actions of the clamping assembly. The clamping assembly is movably connected to the rotating mechanism. The driving cylinder is fixedly connected to the lifting device. The servo motor is arranged above the driving cylinder and is connected to the rotating mechanism through a transmission mechanism, and is used to drive the rotating mechanism to drive the clamping assembly and the sample to rotate.

5. The fatigue testing machine according to claim 4, characterized in that: The clamping assembly includes a claw and a clamping arm, the claw is fixedly connected to the driving cylinder, the clamping arm is fixedly connected to the claw, and a plurality of clamping teeth are arranged on the clamping arm. When it is necessary to clamp the sample, compressed air is input into the air inlet of the driving cylinder through the control device, so that the piston rod in the driving cylinder moves forward, thereby pushing the claw to approach the sample and clamp it; when it is necessary to release the sample, the control device will switch the output direction of the compressed air or stop supplying air to the driving cylinder, so that the piston rod in the driving cylinder moves backward under the action of air pressure, thereby driving the claw to move away from the sample and release it.

6. The fatigue testing machine according to claim 1, characterized in that: The fixing device includes a sliding seat, a mounting seat, an adjusting block and a locking piece. The mounting seat is fixedly connected to the sliding seat. A sliding groove is provided on the mounting seat. The adjusting block is slidably connected to the sliding groove. The locking piece passes through the adjusting block and is detachably connected to the mounting seat. The adjusting block is used to limit the position of the sample. The sliding seat is provided on the adjusting device and is movably connected to the adjusting device.

7. The fatigue testing machine according to claim 1, characterized in that: The adjusting device includes a second rotating wheel, a second ball screw, a guide seat and a guide rod. The second rotating wheel is fixedly connected to one end of the second ball screw. The end of the second ball screw away from the second rotating wheel is rotatably connected to the guide seat through a bearing. The guide rod is arranged in the guide seat and fixedly connected to the guide seat. The fixing device is sleeved on the second ball screw and rotatably connected to the second ball screw. The fixing device is sleeved on the guide rod and slidably connected to the guide rod.

8. The fatigue testing machine according to claim 1, characterized in that: The load-bearing structure includes a fixed seat, a guide column, a weight and a connecting seat, the guide column is provided with a limited position head, the guide column is detachably connected to the fixed seat, the weight is sleeved on the guide column and is slidably connected to the guide column, the connecting seat is arranged at the center of the weight, the weight is sleeved on the connecting seat, a connecting ring is provided on the connecting seat, and the connecting ring is detachably connected to the sample.

9. The fatigue testing machine according to claim 1, characterized in that: It includes a pulley device, which is fixedly connected to the fixing device. The pulley device includes a fixing frame, a connecting rod, a limiting seat and a pulley. The fixing frame is fixedly connected to the fixing device, one end of the connecting rod is fixedly connected to the fixing frame, the limiting seat is fixedly connected to one end of the connecting rod away from the fixing frame, and the pulley is rotatably connected to the limiting seat.

10. A test method for a fatigue testing machine, characterized in that: The fatigue testing machine according to any one of claims 1 to 9 comprises the following steps: Lifting and positioning: operate the lifting device to drive the pneumatic clamp to rise, loosen the fixture, operate the adjustment device to move the fixture so that the sample placement position of the fixture is on the same center line as the pneumatic clamp; Sample installation: Place the sample on the fixture and tighten the fixture; Sample preparation: open the sample rotating buckle, stretch the sample rope to the limit length, tie the sample rope to the weight-bearing structure, and control the pneumatic clamp to stably grasp the sample rotating buckle; Parameter setting: Set the parameters required for the test through the control device, including rotation speed, weight, and number of tests; Test cycle: The pneumatic clamp presses the rotary buckle to lock it, and the servo motor drives the pneumatic clamp to rotate, so that the load-bearing structure is lifted to the preset height. When the preset torque value is reached, the pneumatic clamp will automatically open, so that the sample rotary buckle is unlocked, and the load-bearing structure will fall due to gravity. At the same time, the sample rope will be released to its maximum length. The above cycle process is repeated until the preset number of tests is reached or the sample is fatigued.

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