A device and method for testing the tensile strength of aluminum alloy strip

Abstract

This invention belongs to the field of aluminum alloy tensile strength testing technology, specifically relating to a device and method for testing the tensile strength of aluminum alloy strip. The device includes a testing platform and guide rails, a central crossbeam positioned between the two guide rails, and two clamps. One clamp is connected to a sensor for monitoring the sample load. A ball screw and drive mechanism are used to move the central crossbeam. Disposable pads, suspension forks, and straightening components are sequentially connected laterally to both ends of the central crossbeam. The testing method includes an initialization device: the two clamps are moved apart to create a gap for placing the sample, and the sensor is connected to an external controller to initialize the sensor parameters. This invention's vertical sample clamping provides significant convenience for small-batch testing of aluminum alloy strip in the laboratory, enabling sample straightening during testing, preventing the sample from breaking in the middle under load, and facilitating emergency unloading when subjected to excessive load.

Description

Technical Field

[0001] This invention belongs to the field of aluminum alloy tensile strength testing technology, specifically relating to an aluminum alloy strip tensile strength testing device and testing method. Background Technology

[0002] Aluminum alloy strips are widely used in aerospace, automotive, and construction industries. Insufficient strength can lead to structural failures, such as cracking of aircraft skin and deformation of the vehicle body. Tensile testing of aluminum alloy strips before production can detect potential defects in advance, thereby avoiding possible safety accidents.

[0003] Before aluminum alloy strip production, most manufacturers used tensile testing machines to test aluminum alloy strip samples. These tensile testing machines needed to meet ISO 7500-1 or ASTM E4 standards, with an accuracy class ≥1. For example, a search revealed a Chinese invention, CN119643273B, which describes a tensile testing device for high-strength, high-conductivity alloy materials. This device uses a material carrier for batch feeding and a first electric push rod to extend and push the clamps to hold the samples before tensile testing. This addresses the problem of existing tensile strength testing machines not being able to perform batch testing of tensile materials. However, the following areas still require further improvement:

[0004] 1. When conducting tensile strength tests on aluminum alloy strips, long strip-shaped samples are often prepared and tested one by one in the laboratory. At this time, using a material rack for loading takes up a lot of space, which brings certain inconvenience to the small-batch testing of aluminum alloy strips in the laboratory.

[0005] 2. When aluminum alloy strip is stretched, both ends are clamped and locked. If the clamping point shifts or tilts under load, it will produce a certain skew angle, which can easily cause deformation or breakage at the end of the sample. This makes it difficult to break the sample from the middle to complete the test, and makes it difficult to correct the deviation in the tensile test results in a timely manner. Summary of the Invention

[0006] The purpose of this invention is to provide a tensile strength testing device and method for aluminum alloy strips. The vertical clamping of the sample brings greater convenience to the small-batch testing of aluminum alloy strips in the laboratory. During the testing process, the sample can be straightened, so that it breaks in the middle after being loaded, and the load can be unloaded urgently when subjected to excessive load.

[0007] The specific technical solution adopted by this invention is as follows:

[0008] A tensile strength testing device for aluminum alloy strip includes a testing machine and a guide rail slide, and further includes:

[0009] A central crossbeam and two clamps are disposed between the two guide rail slides, one of the clamps being connected to a sensor for monitoring the sample load;

[0010] The ball screw and drive mechanism are used to move the middle crossbeam. Disposable pads, suspension forks and straighteners are connected laterally at both ends of the middle crossbeam. When the tensile specimen is stretched, the suspension forks and straighteners straighten the specimen and break it in the middle after the specimen is loaded.

[0011] A perpendicularity gauge and a lubrication mechanism are used to monitor the perpendicularity of the sample. The lubrication mechanism sprays lubricating oil onto the ball screw and the centering member.

[0012] As an optional solution, the disposable pad has honeycomb holes facing the suspension fork, and sound-absorbing hollow tubes are fixed to all four edges of the disposable pad;

[0013] When the straightening component impacts the guide rail slide, the disposable pad collapses into the honeycomb holes due to the squeezing action of the straightening component, thereby unloading the ball screw.

[0014] As an optional solution, the lubrication mechanism includes a spray head disposed outside the suspension fork, and the spray head is sequentially connected to a delivery hose, a feed pump and a lubricating oil tank;

[0015] The spray head sprays lubricating oil to lubricate the ball screw and the straightener.

[0016] As an alternative, the clamp includes a suspension handle and a support plate axially connected to the suspension handle. The support plate has a movable groove and a guide groove that communicate with each other. Two engagement blocks that slide along the guide groove are provided inside the movable groove.

[0017] When the sample is loaded, the two engagement blocks close along the guide groove to hold the sample in place.

[0018] As an alternative, both of the engagement blocks have concave ends and a hammer pin is inserted between the two concave ends. The hammer pin ends are connected to a handle and a return spring at intervals. A rotating shaft is rotatably connected between the outer side of the handle and the inner wall of the movable groove.

[0019] When the handle rotates clockwise relative to the rotating shaft, the handle pulls the hammer pin to separate the two engagement blocks and compress the return spring;

[0020] When the handle is reversed relative to the rotation axis, the return spring pushes the two engagement blocks to close.

[0021] As an optional solution, an upper crossbeam and a hook connected to the upper crossbeam are provided between the tops of the two guide rail slides, and a protective cover connected to the bottom of the two guide rail slides is fixed to the outside of the testing machine.

[0022] The protective cover is used to enclose the drive mechanism and to catch the lubricating oil dripping from the lubrication mechanism.

[0023] As an alternative, the drive mechanism includes a coupling, a right-angle transmission component, a first synchronous toothed belt, and a drive motor that are sequentially connected to the ball screw, with the right-angle transmission component and the drive motor both installed inside the protective cover.

[0024] As an alternative, both ball screws are provided with a horizontal drive wheel at their bottom and a second synchronous toothed belt located outside the horizontal drive wheel;

[0025] When the drive mechanism rotates one of the ball screws, the second synchronous toothed belt drives the other ball screw to rotate synchronously.

[0026] As an alternative, it also includes:

[0027] A calibration flange, wherein the four corners of the calibration flange are respectively connected to the four suspension forks;

[0028] A hollow leg tube, the end of which is sleeved onto the end of the suspension fork furthest from the centering member.

[0029] A method for tensile strength testing of aluminum alloy strip includes the following steps:

[0030] Initialization device: Remove the two clamps to open the gap, which is used to place the sample, and connect the sensor to the external controller to initialize the sensor parameters;

[0031] Clamping the specimen: Insert both ends of the specimen into the two clamps respectively, calibrate the vertical position of the specimen, clamp the specimen with the clamps, and complete the loading;

[0032] Applying load: The drive mechanism is activated by the external controller to lower the middle crossbeam, so that the two clamps move away from each other to stretch the specimen and apply load to the specimen;

[0033] Deformation compensation: When the specimen is stretched, if the specimen is tilted, the bending deformation of the middle crossbeam and ball screw is compensated by limiting the middle crossbeam through the suspension fork and the straightening component. The straightening component slides vertically along the inner wall of the guide rail slide, keeping the two clamps vertically aligned and thus straightening the specimen.

[0034] Regular lubrication: Activate the lubrication mechanism to draw in external lubricating oil and spray lubricating oil into the tensile testing device to reduce internal friction and ensure smooth operation, thereby improving the smoothness of the straightening component's downward movement.

[0035] Output results: The load is continuously applied to the specimen until it breaks in the middle after the load is applied. The ball screw is then stopped, the clamp is opened and the broken specimen is removed, the sensor output data is recorded, and the maximum value of the output data is taken as the tensile strength result.

[0036] The technical effects achieved by this invention are as follows:

[0037] This invention employs a vertical clamping method for specimens, which fully utilizes three-dimensional space and facilitates specimen placement, providing greater convenience for small-batch testing of aluminum alloy strips in the laboratory. It primarily uses a limiting crossbeam that slides vertically along the inner wall of the guide rail, keeping the two clamps vertically aligned and thus straightening the specimen. This allows the specimen to break in the middle after being loaded. If excessive load is applied, a buffer space is created by the collapse and deformation of a disposable pad, enabling emergency unloading and preventing violent impact or seizing within the tensile testing device. Simultaneously, the perpendicularity of the specimen is monitored; an alarm is triggered when the perpendicularity exceeds 1°, alerting staff to perform maintenance.

[0038] Because the transmission structure is built into the tensile testing device, and the lifting liquid pump and lubricating oil tank are placed outside the tensile testing device, the present invention draws lubricating oil by starting the lifting liquid pump at set intervals through a preset program, so that the spray head sprays lubricating oil on the outside of the suspension fork to lubricate the ball screw and the straightener. The lubrication of the transmission structure and the straightener can be completed without opening the entire tensile testing device, which has a good performance in ensuring smooth load transmission.

[0039] The disposable pad of the present invention is subjected to compression, and through several honeycomb holes as deformation space, the disposable pad collapses into the honeycomb holes due to the compression of the straightening member, which facilitates the rapid collapse of the disposable pad and realizes the unloading of the ball screw in the horizontal direction. In addition, sound-absorbing hollow tubes are fixed on all four edges of the disposable pad. The sound-absorbing hollow tubes made of polyurethane foam have good flexibility and can also absorb the noise generated when the disposable pad collapses, thus optimizing the emergency unloading operation during the sample straightening process. Attached Figure Description

[0040] Figure 1 This is a front view of an aluminum alloy strip strength tensile testing device according to Embodiment 1 of the present invention;

[0041] Figure 2 This is a rear view of an aluminum alloy strip strength tensile testing device according to Embodiment 1 of the present invention;

[0042] Figure 3 This is a front view of the connection state between the middle crossbeam and the upper crossbeam in Embodiment 1 of the present invention;

[0043] Figure 4 This is a front view of the sample held by the biting block in Embodiment 1 of the present invention;

[0044] Figure 5 This is a front view of the carrier disk in Embodiment 1 of the present invention;

[0045] Figure 6 This is a rear view of the carrier disk in Embodiment 1 of the present invention;

[0046] Figure 7 This is a front view of the paired biting blocks in Embodiment 1 of the present invention;

[0047] Figure 8 This is a rear view of the paired bite blocks in Embodiment 1 of the present invention;

[0048] Figure 9 This is a front view of the straightening component in Embodiment 1 of the present invention;

[0049] Figure 10 This is a side view of the verification flange in Embodiment 1 of the present invention;

[0050] Figure 11 This is a front view of the suspension fork in Embodiment 1 of the present invention;

[0051] Figure 12 This is a side view of the disposable pad in Embodiment 1 of the present invention;

[0052] Figure 13 This is a system block diagram of the controller in Embodiment 1 of the present invention;

[0053] Figure 14 This is a flowchart of a tensile strength testing method for aluminum alloy strip according to Embodiment 2 of the present invention.

[0054] The attached diagram lists the components represented by each number as follows:

[0055] 1. Testing machine base; 2. Guide rail slide; 3. Middle crossbeam; 4. Fixture; 401. Suspension handle; 402. Bearing plate; 403. Movable groove; 404. Engaging block; 405. Guide slide; 406. Hammer pin; 407. Handle; 408. Rotating shaft; 409. Return spring; 5. Ball screw; 6. Upper crossbeam; 601. Hanger; 7. Coupling; 8. Right-angle transmission component; 9. First synchronous toothed belt; 10. Drive motor 11. Horizontal drive wheel; 12. Second synchronous toothed belt; 13. Protective cover; 14. Start button; 15. Emergency stop button; 16. Calibration flange; 17. Alignment component; 18. Suspension fork; 19. Hollow foot tube; 20. Disposable pad; 21. Honeycomb hole; 22. Sound-absorbing hollow tube; 23. Spray head; 24. Conveying hose; 25. Material pump; 26. Lubricating oil tank; 27. Arc clamp; 28. Verticality gauge. Detailed Implementation

[0056] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0057] By comparing the tensile properties of aluminum alloy strips under different heat treatment and rolling processes, parameters affecting production, such as annealing temperature and rolling rate, need further adjustment to improve the consistency of material properties. In addition, tensile data is the core basis for the research and development of high-strength and lightweight aluminum alloys. Therefore, it is essential to conduct tensile strength tests on aluminum alloy strips before production. In particular, it is crucial to successfully carry out small-batch testing of aluminum alloy strips in the laboratory, allowing the samples to break in the middle to complete the test and obtain more accurate tensile test results. This can accelerate the research and development pace and enable aluminum alloy strips to enter the production stage more quickly.

[0058] Example 1:

[0059] like Figures 1-13 As shown, an aluminum alloy strip tensile strength testing device includes a testing platform 1 and guide rail slides 2. In a laboratory, two guide rail slides 2 are fixed side by side on the top of the testing platform 1, placed against or adjacent to a wall. When testing aluminum alloy strip, a specified length of aluminum alloy strip is cut as a sample. Three samples can be taken from aluminum alloy strip produced by each process to prevent randomness. A central crossbeam 3 and two clamps 4 are installed between the two guide rail slides 2. The two clamps 4 are first moved to open the gap for placing the sample. One of the clamps 4 is connected to a sensor for monitoring the sample load. The two clamps 4 are used to clamp the two ends of the sample respectively. A drive mechanism drives the ball screw 5 inside the guide rail slide 2, causing the ball screw 5 to move the central crossbeam 3 along the thread, which drives the two clamps 4 to move vertically away from each other, thereby applying a vertical load to the sample until the sample breaks in the middle. The load is then stopped. At the same time, a lubrication mechanism of an external controller sprays lubricating oil onto the ball screw 5 and the inner wall of the guide rail slide 2 to reduce friction.

[0060] In this embodiment, when testing the tensile strength of aluminum alloy strip, a vertical tensile testing device is set up in the laboratory. Long strip-shaped samples are placed in the device for testing one by one. Since the samples are held by two vertical clamps 4 and the load is applied by an internal drive mechanism, the entire tensile testing device saves more space compared to the traditional material rack loading. The vertical tensile design can make full use of the three-dimensional space and facilitates the placement of samples, bringing greater convenience to the small-batch testing of aluminum alloy strip in the laboratory.

[0061] See Figure 13One of the fixtures 4 uses a tension sensor, such as a U9C, Z6 / Z6R, or IND560 model, which can be used with an RS485 interface for data transmission. The sensor signal is connected to an external controller, such as a Mitsubishi industrial computer.

[0062] See attached document Figure 3 , Figure 5 and Figure 7 In this embodiment, when clamping the sample, the clamp 4 includes a suspension handle 401 and a support plate 402 connected axially to the suspension handle 401. The two suspension handles 401 are respectively set vertically, and the two support plates 402 are kept facing each other. Since the support plate 402 has an interconnected movable groove 403 and a guide slide 405, the two biting blocks 404 set inside the movable groove 403 can slide along the guide slide 405. When the sample is loaded, the two biting blocks 404 can be pushed to close along the guide slide 405 to bite the sample and complete the loading.

[0063] See attached document Figure 4 , Figure 6 and Figure 8 During the feeding stage, to facilitate the operation of the biting blocks 404, both ends of the biting blocks 404 are concave, and a hammer pin 406 is inserted between the two concave shapes. The handle 407 and the return spring 409, which are spaced apart at the ends of the hammer pins 406, can be operated by hand. For example, by turning the handle 407 clockwise or counterclockwise, the handle 407 can swing relative to the rotating shaft 408 that is rotatably connected between its outer side and the inner wall of the movable groove 403. The specific movement is as follows:

[0064] When the handle 407 rotates clockwise relative to the rotating shaft 408, the handle 407 pulls the hammer pin 406 to separate the two biting blocks 404 and compress the return spring 409, leaving a feeding gap so that the sample can be inserted smoothly and avoids scratches that may be caused by direct contact of the biting blocks 404 with the hands.

[0065] When the handle 407 is reversed relative to the rotating shaft 408, the two clamping blocks 404 can be pushed together by the return spring 409 after the sample is placed in, so that the sample is clamped and locked. Even if you let go, you don’t have to worry about the sample falling.

[0066] See attached document Figure 1 and Figure 2To ensure the safe operation of the entire device, this embodiment provides an upper crossbeam 6 and a hook 601 connected to the upper crossbeam 6 between the tops of the two guide rail slides 2. The hook 601 can be pulled by steel cables from the roof to prevent the entire device from tilting. The protective cover 13 is fixed to the outside of the testing machine 1 with screws and connected to the bottom of the two guide rail slides 2. This provides a closed environment for the drive mechanism, preventing external dust and other impurities from entering. The protective cover 13 can also be used to cover the drive mechanism and receive lubricating oil dripping from the lubrication mechanism.

[0067] As an optional embodiment, a start button 14 and an emergency stop button 15 are installed on the outside of the protective cover 13 by screws. Since the external controller signal is connected to the start button 14 and the emergency stop button 15, for example, by using a relay for signal connection, it is convenient for the operator to press the start button 14 to start the drive mechanism or press the emergency stop button 15 to stop the drive mechanism.

[0068] See attached document Figure 1 , Figure 3 and Figure 13 In this embodiment, a coupling 7, a right-angle transmission component 8, a first synchronous toothed belt 9, and a drive motor 10, which are sequentially connected to the ball screw 5, are used to drive the ball screw 5. The right-angle transmission component 8 and the drive motor 10 are bolted to the inside of the protective cover 13 so that the external controller can start the drive motor 10. The drive motor 10 rotates the two shafts of the right-angle transmission component 8 with the first synchronous toothed belt 9. Since the two shafts are connected by bevel gears, the drive motor 10 can be placed horizontally, and the coupling 7 is vertically connected between the ball screw 5 and the right-angle transmission component 8.

[0069] See attached document Figure 1 , Figure 3 and Figure 13 Both ball screws 5 are equipped with horizontal transmission wheels 11 at their bottom and a second synchronous toothed belt 12 located outside the horizontal transmission wheels 11. Since the two horizontal transmission wheels 11 have the same diameter, when the drive mechanism rotates one ball screw 5, the second synchronous toothed belt 12 drives the other ball screw 5 to rotate synchronously, so that the two ball screws 5 have the same speed and direction of rotation. In addition, the ball screws 5 pass through the middle cross beam 3 along the thread. When the two ball screws 5 rotate forward, the thread pushes the middle cross beam 3 to rise, and when the two ball screws 5 rotate in reverse, the thread pushes the middle cross beam 3 to fall, which can drive the two clamps 4 to move away from each other, thereby applying a load to the sample.

[0070] The sample length of aluminum alloy strip is generally greater than 30cm. When clamping both ends, the load is applied from one end. If the clamping point is offset or tilted under load, a certain skew angle will be generated, which can easily cause deformation or breakage at the end of the sample. This makes it difficult to pull the sample from the middle to complete the test, and makes it difficult to correct the deviation in the tensile test results in a timely manner.

[0071] See attached document Figure 9 , Figure 10 and Figure 13 To promptly correct any deviations in the tensile test results, this embodiment connects disposable pads 20, suspension forks 18, and straighteners 17 transversely at both ends of the middle crossbeam 3. The four straighteners 17 are located at the four corners of the middle crossbeam 3. The straighteners 17 can be any of a stainless steel wheel, an alloy roller, or a rolling alloy ball, preferably a stainless steel wheel. Since stainless steel wheels only roll vertically and occupy less space, if the sample is tilted during tensile testing, one of the clamps 4 responsible for pulling the sample and the middle crossbeam 3 will also tilt. Furthermore, the ball screw 5 has a large span and is prone to bending deformation under load. This embodiment compensates for this bending deformation primarily by limiting the middle crossbeam 3 through the suspension forks 18 and the straighteners 17. The straighteners 17 can move along the guide... The guide rail 2 slides vertically along its inner wall, keeping the two clamps 4 vertically aligned and thus straightening the sample. After the sample is loaded, it breaks in the middle. Assuming that the straightening component 17 will compress the disposable pad 20 when the load reaches a certain range, the disposable pad 20 will collapse and deform after bearing a load of 75MPa to 85MPa, leaving a buffer space between the straightening component 17 and the guide rail 2, thus achieving emergency unloading and preventing the straightening component 17 from violently colliding or locking with the guide rail 2. At the same time, a verticality gauge 28 is installed on the outside of the middle crossbeam 3 to monitor the verticality of the sample. Since the verticality gauge 28 is electrically connected to an external controller, it can monitor the verticality of the middle crossbeam 3 in real time. Under the preset program of the controller, when the verticality is greater than 1°, an alarm is issued to remind the staff to carry out maintenance.

[0072] In this embodiment, since aluminum alloy materials can generally withstand loads of 160MPa to 205MPa, and the load applied in the experiment is vertical, while the disposable pad 20 only bears the load that deviates laterally, the disposable pad 20 can be made of polycarbonate material, with a maximum load capacity of 80MPa. It will collapse and deform if it withstands a load exceeding 80MPa. Secondly, the verticality gauge 28 can be a 3DM-CX5-15 model vertical reference sensor, which has a built-in fully calibrated and temperature-compensated triaxial accelerometer and gyroscope, and can realize the measurement of verticality under dynamic conditions.

[0073] See attached document Figure 3 , Figure 9 and Figure 10In this embodiment, two sets of calibration flanges 16 and hollow foot tubes 19 are also installed on the outside of the middle crossbeam 3. The four corners of the calibration flanges 16 are respectively connected to the four suspension forks 18 by screws, so that the four suspension forks 18 can be installed in place at one time. This makes it convenient for the suspension forks 18 to support the four straightening parts 17 and straighten the middle crossbeam 3 from the four corners. Since the end of the hollow foot tube 19 is sleeved on the end of the suspension fork 18 away from the straightening part 17, the hollow foot tube 19 restricts the suspension fork 18 and the straightening part 17 to only be horizontally displaced relative to the middle crossbeam 3, so as to stably straighten the middle crossbeam 3. It also allows the suspension fork 18 to apply the reaction force of the straightening part 17 to the disposable pad 20.

[0074] As an optional embodiment, a horizontal flange and a vertical flange are added to the outside of the hollow tube 19. The horizontal flange and the vertical flange can be fixed to the middle crossbeam 3 with screws to tighten the hollow tube 19 at multiple angles. When the disposable pad 20 collapses and deforms, the hollow tube 19 is prevented from being squeezed, deformed or cracked.

[0075] See attached document Figure 2 , Figure 9 and Figure 13 Since the transmission structure in this solution is built into the tensile testing device, lubrication of the transmission structure is inconvenient. In this embodiment, a material lifting pump 25 and a lubricating oil tank 26 are placed outside the tensile testing device. A spray head 23 is used to connect the delivery hose 24, the material lifting pump 25 and the lubricating oil tank 26 in sequence. Since the external controller is electrically connected to the material lifting pump 25, the material lifting pump 25 can be started at a time through a preset program. The material lifting pump 25 draws lubricating oil from the lubricating oil tank 26 through the immersion tube, so that the spray head 23 sprays lubricating oil on the outside of the suspension fork 18 to lubricate the ball screw 5 and the straightener 17. The lubrication of the transmission structure and the straightener 17 can be completed without opening the entire tensile testing device, which has a good performance in ensuring smooth load transmission.

[0076] As an optional embodiment, the spray head 23 has three nozzles: one nozzle is cylindrical and faces the adjacent ball screw 5, and the other two nozzles are flared and face the upright members 17 on both sides, which facilitates lubrication of the upright members 17 that slide vertically.

[0077] See attached document Figure 10 and Figure 12In this embodiment, honeycomb holes 21 are also opened on the disposable pad 20 facing the suspension fork 18. When the straightening member 17 hits the guide rail slide 2, the disposable pad 20 is squeezed. The honeycomb holes 21 serve as deformation space, which facilitates the rapid collapse of the disposable pad 20. As a result, the disposable pad 20 collapses into the honeycomb holes 21 due to the squeezing action of the straightening member 17, thereby achieving unloading of the ball screw 5 in the horizontal direction. In addition, in this embodiment, sound-absorbing hollow tubes 22 are fixed on all four edges of the disposable pad 20. The sound-absorbing hollow tubes 22 made of polyurethane foam have good flexibility. The sound-absorbing hollow tubes 22 can fill the gap between the disposable pad 20 and the hollow foot tube 19. Moreover, the sound-absorbing hollow tubes 22 can absorb the noise generated when the disposable pad 20 collapses, further optimizing the emergency unloading operation during the sample straightening process.

[0078] Example 2:

[0079] like Figure 14 As shown, a method for tensile strength testing of aluminum alloy strip includes the following steps:

[0080] Initialization device: Remove the two clamps 4 to open the gap for placing the sample, and connect the sensor to an external controller, such as a separately configured computer, to initialize the sensor parameters;

[0081] Clamping the specimen: Insert both ends of the specimen into the two clamps 4 respectively. A spirit level can be used to calibrate the verticality of the specimen. Clamp the specimen with the clamps 4 to complete the loading.

[0082] The hammer pin 406 is operated by hand. The handle 407 and the return spring 409 are connected at the end of the hammer pin 406. The handle 407 pulls the hammer pin 406 to separate the two biting blocks 404 and compress the return spring 409, leaving a feeding gap. The sample can be inserted smoothly and the scratches that may be caused by direct contact of the biting blocks 404 with the hands can be avoided. Then, the return spring 409 pushes the two biting blocks 404 to close, so that the sample is clamped and locked. Even if you let go, there is no need to worry about the sample falling.

[0083] Applying load: The drive mechanism is activated by the external controller, which pushes the middle crossbeam 3 to lower, which can drive the two clamps 4 to move away from each other, so as to stretch the specimen and apply load to the specimen;

[0084] In this system, the drive motor 10 rotates the two shafts of the right-angle transmission component 8 via the first synchronous toothed belt 9. Since the two shafts are connected by bevel gears, the drive motor 10 can be placed horizontally, and the coupling 7 is vertically connected between the ball screw 5 and the right-angle transmission component 8. Since the two horizontal transmission wheels 11 have the same diameter, when the drive mechanism rotates one ball screw 5, the second synchronous toothed belt 12 drives the other ball screw 5 to rotate synchronously, so that the two ball screws 5 have the same speed and direction of rotation. In addition, the ball screw 5 passes through the middle cross beam 3 along the thread. When the two ball screws 5 rotate forward, the thread pushes the middle cross beam 3 to rise, and when the two ball screws 5 rotate in reverse, the thread pushes the middle cross beam 3 to fall, which can drive the two clamps 4 to move away from each other, thereby applying a load to the sample.

[0085] Deformation compensation: In order to correct the deviation that may occur in the tensile test results in a timely manner, when the specimen is stretched, if the specimen is skewed, one of the clamps 4 and the middle crossbeam 3 responsible for pulling the specimen will be skewed. In addition, the ball screw 5 has a large span and is prone to bending deformation due to the load. At this time, this embodiment compensates for the bending deformation, mainly by limiting the middle crossbeam 3 through the suspension fork 18 and the straightening member 17. The straightening member 17 can slide vertically along the inner wall of the guide rail slide 2, so that the two clamps 4 remain vertically aligned and the specimen is straightened.

[0086] Assuming that the straightening component 17 will compress the disposable pad 20 when the load reaches a certain range, the disposable pad 20 will collapse and deform after bearing a load of 75MPa to 85MPa, leaving a buffer space between the straightening component 17 and the guide rail slide 2, realizing emergency unloading, and preventing the straightening component 17 from violently colliding or locking with the guide rail slide 2. At the same time, a verticality gauge 28 is installed on the outside of the middle crossbeam 3 to monitor the verticality of the sample. Since the verticality gauge 28 is electrically connected to the external controller, it can monitor the verticality of the middle crossbeam 3 in real time. Under the action of the controller's preset program, when the verticality is greater than 1°, an alarm will be issued to remind the staff to carry out maintenance.

[0087] Regular lubrication: Start the lubrication mechanism to draw in external lubricating oil and spray lubricating oil into the tensile testing device to reduce internal friction and ensure smooth operation, thereby improving the smoothness of the sliding of the straightener 17 and lubricating the surface of the ball screw 5.

[0088] Output results: Apply a load to the specimen continuously until it breaks in the middle after being loaded. Stop the ball screw 5 to avoid unnecessary mechanical wear caused by no load. Then open the clamp 4 to take out the broken specimen, record the sensor output data, and take the maximum value of the output data as the tensile strength result.

[0089] The above description is merely an optional embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. An aluminum alloy strip strength tensile detection device, comprising a detection machine table (1) and a guide rail slide (2), characterized in that, Also include: The middle beam (3) and two clamps (4) are arranged between the two guide rails (2), one of the clamps (4) is connected with a sensor for monitoring the sample load; Ball screw (5) and driving mechanism for moving the middle beam (3), the middle beam (3) is transversely connected with a disposable pad (20), a suspension yoke (18) and a centralizer (17) in turn at both ends, when the sample is stretched, the suspension yoke (18) and the centralizer (17) support the sample, so that the sample is disconnected from the middle after bearing the load; The verticality meter (28) and the lubricating mechanism for monitoring the verticality of the sample, the lubricating mechanism sprays lubricating oil to the ball screw (5) and the centralizer (17); The disposable pad (20) is provided with a honeycomb hole (21) facing the suspension yoke (18), and four edges of the disposable pad (20) are fixed with sound absorbing hollow tubes (22); When the centralizer (17) hits the guide rail (2), the disposable pad (20) collapses into the honeycomb hole (21) due to the extrusion of the centralizer (17), so as to realize the unloading of the ball screw (5).

2. The aluminum alloy strip strength tensile detection apparatus of claim 1, wherein: The lubricating mechanism includes a spray head (23) arranged outside the suspension yoke (18), and the spray head (23) is sequentially connected with a conveying hose (24), a lifting liquid pump (25) and a lubricating oil tank (26); The spray head (23) sprays lubricating oil to lubricate the ball screw (5) and the centralizer (17).

3. The apparatus of claim 1 wherein The clamp (4) includes a suspension handle (401) and a bearing disc (402) connected with the suspension handle (401) in the axial direction, the bearing disc (402) is provided with a movable groove (403) and a guide sliding groove (405) which are communicated with each other, and the movable groove (403) is provided with two engaging blocks (404) which slide along the guide sliding groove (405); When the sample is loaded, the two engaging blocks (404) are closed along the guide sliding groove (405) to clamp the sample.

4. The apparatus of claim 3, wherein: The end of the two engaging blocks (404) is concave, and a hammer head pin (406) is inserted between the two concave shapes, the end of the hammer head pin (406) is connected with a handle (407) and a reset spring (409) at intervals, and a rotating shaft (408) is rotatably connected between the outer side of the handle (407) and the inner wall of the movable groove (403); When the handle (407) rotates relative to the rotating shaft (408), the handle (407) pulls the hammer head pin (406) to separate the two engaging blocks (404) and compresses the reset spring (409); When the handle (407) rotates relative to the rotating shaft (408), the reset spring (409) pushes the two engaging blocks (404) to close.

5. The apparatus of claim 1, wherein: An upper beam (6) and a hanging buckle (601) connected with the upper beam (6) are arranged between the top of the two guide rails (2), and a protective shell (13) connected with the bottom of the two guide rails (2) is fixed outside the detection machine (1); The protective shell (13) is used for covering the driving mechanism and receiving lubricating oil dripped from the lubricating mechanism.

6. The aluminum alloy strip strength tensile detection apparatus of claim 5, wherein: The driving mechanism comprises a shaft coupling (7), a right-angle transmission member (8), a first synchronous toothed belt (9) and a driving motor (10) which are sequentially connected with the ball screws (5).

7. The aluminum alloy strip strength tensile detection apparatus of claim 6, wherein: The bottom of each of the ball screws (5) is provided with a horizontal transmission wheel (11) and a second synchronous toothed belt (12) located outside the horizontal transmission wheel (11). When the driving mechanism rotates one of the ball screws (5), the second synchronous toothed belt (12) drives the other ball screw (5) to rotate synchronously.

8. The apparatus of claim 1, wherein, Further comprising: A calibration flange (16) is connected to four suspension yokes (18) respectively; A hollow foot pipe (19) is sleeved with one end of the suspension yoke (18) away from the centralizing member (17).

9. A method of strength tensile testing of an aluminum alloy strip using the strength tensile testing apparatus for an aluminum alloy strip according to any one of claims 1 to 8, characterized by, The method comprises the following steps: Initialization device: move away the two clamps (4) to open a space for placing the sample, and connect the sensor to the external controller to initialize the sensor parameters; Clamping the sample: insert the two ends of the sample into the two clamps (4) respectively, calibrate the vertical state of the sample, clamp the sample through the clamps (4), and complete the loading; Loading: start the driving mechanism to push down the middle beam (3) through the external controller, so that the two clamps (4) move away from each other to stretch the sample and realize loading on the sample; Deformation compensation: when stretching the sample, once the sample is deflected, limit the middle beam (3) through the suspension yoke (18) and the centralizing member (17), and compensate for the bending deformation of the middle beam (3) and the ball screw (5), wherein the centralizing member (17) vertically slides along the inner wall of the guide rail slide (2) to keep the two clamps (4) vertically opposite and realize the centralizing of the sample; Periodic lubrication: start the lubricating mechanism to suck external lubricating oil and spray lubricating oil into the inside of the stretching detection device to reduce the friction inside the stretching detection device and make the operation smooth, so as to improve the smoothness of the centralizing member (17) sliding down; Output result: continuously load the sample until the sample is disconnected from the middle, stop the ball screw (5), open the clamp (4) to take out the broken sample, record the sensor output data, and take the maximum value of the output data as the tensile strength result.

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