Method and apparatus for testing the limit bending radius and fatigue strength of flexible sheet material

Abstract

The application discloses a kind of limit bending radius and fatigue strength test method and device for flexible plate, including first support plate, second support plate and rotating mechanism;Wherein, the rotating mechanism includes horizontally arranged positive rotation shaft, and first rotating arm assembly is installed on the positive rotation shaft;The first support plate and the second support plate are adjacently arranged below the positive rotation shaft;The first rotating arm assembly connects the first support plate, so that the first support plate can be rotated relative to the positive rotation shaft, so that the included angle between first support plate and second support plate changes.The device is simple in structure, and is convenient to adjust;Different glass specifications can be quickly adjusted and test results are quickly obtained, and the repeatability is high;The method is simple to operate, and measurement data is accurate, and data repeatability and reliability are high.

Description

Technical Field

[0001] This invention relates to the field of ultra-thin flexible glass production technology, specifically to a method and apparatus for testing the ultimate bending radius and fatigue strength of flexible sheets. Background Technology

[0002] With the development and innovation of 5G technology, foldable screen phones have begun to enter the market and become an emerging trend in mobile phone development. The protective cover for foldable screen phones can use CPI film or ultra-thin flexible glass (UTG glass). Using CPI film as the protective material for foldable phone screens has the advantages of being inexpensive, having good toughness, and being easy to process. However, its disadvantages include noticeable creases after repeated folding, affecting the display effect; low surface hardness, making it prone to scratches; low transparency; and a tendency to yellow after prolonged use. Most importantly, it is not heat-resistant, preventing the application of high-temperature processing techniques.

[0003] Compared to CPI film, ultra-thin flexible glass (UTG glass) offers superior performance in terms of surface flatness, scratch resistance, high-temperature resistance, and impact protection for display components. The glass can also restore its original flatness after repeated bending over a long period.

[0004] However, current equipment and methods for testing the bending radius and fatigue strength of ultrathin flexible glass still cannot meet the needs. Summary of the Invention

[0005] The main objective of this invention is to provide a method and apparatus for testing the ultimate bending radius and fatigue strength of flexible sheets, so as to overcome the deficiencies of the prior art in bending radius testing and fatigue strength testing.

[0006] According to one aspect of the present invention, a bending device for flexible sheet metal is provided, comprising a first support plate, a second support plate, and a rotating mechanism;

[0007] The rotating mechanism includes a horizontally arranged forward rotating shaft and a first rotating arm assembly mounted on the forward rotating shaft.

[0008] The first support plate and the second support plate are arranged adjacently below the positive rotation axis;

[0009] The first rotating arm assembly is connected to the first support plate, allowing the first support plate to rotate relative to the forward rotation axis, thereby changing the included angle between the first support plate and the second support plate.

[0010] Furthermore, it also includes a detection device arranged toward the adjacent area of ​​the first support plate and the second support plate.

[0011] Furthermore, it also includes a mounting box and a height adjustment device, the height adjustment device being mounted on the mounting box, and the second support plate being fixed on the height adjustment device;

[0012] The first rotating arm assembly includes a first rotating arm, a first guide post, and a first sliding sleeve. The first end of the first rotating arm is fixedly mounted on the forward rotating shaft. The upper end of the first guide post is mounted on the second end of the first rotating arm. The first sliding sleeve is mounted on the first guide post in a vertically movable manner, and the first sliding sleeve is fixedly connected to the first support plate.

[0013] Furthermore, the first guide post includes a first positioning portion and a first guide portion extending downward from the first positioning portion;

[0014] The lower part of the first guide portion is provided with an external thread, and the first sliding sleeve has a threaded hole. The first sliding sleeve is fitted onto the first guide portion through the threaded hole.

[0015] Furthermore, the first rotating arm is provided with a positioning light hole, and the first positioning part is rotatably mounted on the positioning light hole.

[0016] Furthermore, the first positioning part includes an adjustment block that blocks the upper end of the positioning light hole, and a positioning rod that passes through the positioning light hole, and the first guide part is formed by extending downward from the lower end of the positioning rod.

[0017] Furthermore, the height adjustment device includes a third guide post and a rotating component, wherein the rotating component has an adjustment threaded hole in the middle for the third guide post to pass through, and the outer wall of the third guide post is provided with an external thread;

[0018] The rotating component is rotatably fixed to the upper cover of the mounting box, and the third guide post extends partially out of the upper surface of the rotating component so that the upper end of the third guide post pushes up the second support plate.

[0019] Furthermore, the rotating mechanism also includes a reverse rotating shaft and a second rotating arm assembly mounted on the reverse rotating shaft, wherein the axes of the reverse rotating shaft and the forward rotating shaft coincide, and the rotation directions of the reverse rotating shaft and the forward rotating shaft are opposite.

[0020] The second rotating arm assembly is connected to the second support plate, enabling the second support plate to rotate relative to the reverse rotation axis.

[0021] Furthermore, the second rotating arm assembly includes a second rotating arm, a second guide post, and a second sliding sleeve. The first end of the second rotating arm is fixedly mounted on the forward rotating shaft, the upper end of the second guide post is mounted on the second end of the second rotating arm, the second sliding sleeve is vertically displaceable and fitted onto the second guide post, and the second sliding sleeve is fixedly connected to the second support plate.

[0022] Furthermore, it also includes a motor and a transmission assembly, the motor being connected to the forward rotation shaft and the reverse rotation shaft via the transmission assembly, and the motor being disposed within the mounting box.

[0023] According to another aspect of the present invention, a method for testing the ultimate bending radius and fatigue strength of flexible sheet metal is provided, employing the aforementioned bending device for flexible sheet metal, comprising:

[0024] Step 1: Set the initial bending radius r of the flexible glass to be tested; adjust the height of the first support plate and the second support plate so that the first support plate and the second support plate are on the same plane and the first distance h between them and the center line of the positive rotation axis is equal to the initial bending radius r; fix the flexible glass to be tested on the first support plate and the second support plate, and record it as the initial position of the first support plate and the second support plate.

[0025] Step 2: The rotating mechanism drives the first support plate to rotate, or the rotating mechanism drives the first support plate and the second support plate to rotate synchronously relative to each other;

[0026] Step 3: When the flexible glass to be tested breaks, record the sum of the rotation angles α of the first support plate and the second support plate. The current glass bending radius R is obtained by R = f(h, α), where 0° < α < 180°.

[0027] Step 4: Adjust the height of the first support plate and the second support plate so that the first support plate and the second support plate are on the same plane, and the first distance h between them and the center line of the rotation axis is equal to the current bending radius R.

[0028] Step 5: Repeat steps 2, 3, and 4 until α = 180° and the flexible glass under test does not break. At this point, the first distance h between the first and second support plates and the center line of the rotation axis is the minimum bending radius R of the flexible glass under test. min ;

[0029] Step Six: Set the first distance h between the horizontal plane containing the first and second support plates and the centerline of the rotation axis as the minimum bending radius R of the flexible glass to be tested. min ;

[0030] Step 7: The rotating mechanism drives the first support plate to rotate, or the rotating mechanism drives the first support plate and the second support plate to rotate synchronously relative to each other, so as to bend the flexible glass to be tested.

[0031] Step 8: Repeat step 7 until the flexible glass to be tested breaks. Record the number of repetitions N, which is the bending strength N of the flexible glass to be tested. max .

[0032] By adopting the above technical solution, the present invention has at least the following beneficial effects:

[0033] The present invention provides a method and apparatus for testing the ultimate bending radius and fatigue strength of flexible sheets. By using a rotating mechanism and a rotating arm, the support plate is rotated, thereby causing the flexible sheet fixed on the support plate to bend. By continuously adjusting the distance between the plane of the first and second support plates and the rotation axis, the minimum bending radius of the flexible sheet can be obtained. By repeatedly bending the sheet at the minimum bending radius, the bending strength of the flexible sheet can be obtained, and the fatigue life of the flexible sheet can be analyzed. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A schematic diagram of the initial state of a bending device for flexible sheet metal disclosed in an embodiment of the present invention is shown;

[0036] Figure 2 A schematic diagram of the bending process of a bending device for flexible sheet metal disclosed in an embodiment of the present invention is shown.

[0037] Figure 3 A schematic diagram of a bending device for flexible sheets, disclosed in an embodiment of the present invention, is shown, showing a bending structure up to 180°.

[0038] Figure 4 A schematic diagram of the initial state of a bending device for flexible sheet metal disclosed in an embodiment of the present invention is shown;

[0039] Figure 5 A schematic diagram of the bending process of a bending device for flexible sheet metal disclosed in an embodiment of the present invention is shown.

[0040] Figure 6A schematic diagram of a bending device for flexible sheets, disclosed in an embodiment of the present invention, is shown, showing the bending angle up to 180°. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0042] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0043] Some embodiments of the present invention disclose a bending device for flexible sheets, which can be used for testing the ultimate bending radius and fatigue strength of flexible sheets. The device includes a first support plate, a second support plate, and a rotating mechanism. The rotating mechanism includes a horizontally arranged forward rotating shaft and a first rotating arm assembly mounted on the forward rotating shaft. The first support plate and the second support plate are arranged adjacently below the forward rotating shaft. The first rotating arm assembly connects to the first support plate, allowing the first support plate to rotate relative to the forward rotating shaft, thereby changing the included angle between the first and second support plates. A detection device can be provided to detect whether the sheet material to be tested is broken; the detection device is arranged towards the adjacent area of ​​the first and second support plates.

[0044] This embodiment uses a rotating mechanism and a rotating arm to rotate the first support plate, or to rotate the first and second support plates simultaneously, thereby bending the flexible sheet material, such as flexible glass, fixed on the support plate. By continuously adjusting the distance between the plane of the first and second support plates and the rotation axis, the minimum bending radius of the flexible sheet material can be obtained. By repeatedly bending the sheet material at the minimum bending radius, the bending strength of the flexible sheet material can be obtained, and the fatigue life of the flexible sheet material can be analyzed.

[0045] Specifically, when testing the ultimate bending radius and fatigue strength of flexible sheets such as ultra-thin flexible glass, a bending radius *r* can be preset. The distance *h* between the planes of the two support plates and the rotation axis is adjusted to equal *r*. The relationship between the bending radius *R*, the bending angle *α*, and the offset distance *h* of the central axis is determined using formulas. By gradually adjusting the distance *h* between the planes of the two support plates and the rotation axis, the minimum bending radius *Rmin* of the glass can be obtained. After determining the minimum bending radius, the sensor monitors the bending state of the glass to obtain the bending strength *Nmax*, ultimately yielding the fatigue strength test result. This device has a simple structure and is easy to adjust; different glass specifications can be quickly adjusted and test results obtained rapidly, with high repeatability. The method is simple to operate, provides accurate measurement data, and has high data repeatability and reliability.

[0046] Some embodiments of the present invention also disclose a method for testing the ultimate bending radius and fatigue strength of flexible glass using the above-described apparatus, including:

[0047] Step 1: Set the initial bending radius r of the flexible glass to be tested; adjust the height of the first support plate and the second support plate so that the first support plate and the second support plate are on the same plane and the first distance h between them and the center line of the positive rotation axis is equal to the initial bending radius r; fix the flexible glass to be tested on the first support plate and the second support plate, and record it as the initial position of the first support plate and the second support plate.

[0048] Step 2: The rotating mechanism drives the first support plate to rotate, or the rotating mechanism drives the first support plate and the second support plate to rotate synchronously relative to each other;

[0049] Step 3: When the flexible glass to be tested breaks, record the sum of the rotation angles α of the first support plate and the second support plate. The current glass bending radius R is obtained by R = f(h, α), where 0° < α < 180°.

[0050] Step 4: Adjust the height of the first support plate and the second support plate so that the first support plate and the second support plate are on the same plane, and the first distance h between them and the center line of the rotation axis is equal to the current bending radius R.

[0051] Step 5: Repeat steps 2, 3, and 4 until α = 180° and the flexible glass under test does not break. At this point, the first distance h between the first and second support plates and the center line of the rotation axis is the minimum bending radius R of the flexible glass under test. min ;

[0052] Step Six: Set the first distance h between the horizontal plane containing the first and second support plates and the centerline of the rotation axis as the minimum bending radius R of the flexible glass to be tested. min ;

[0053] Step 7: The rotating mechanism drives the first support plate to rotate, or the rotating mechanism drives the first support plate and the second support plate to rotate synchronously relative to each other, so as to bend the flexible glass to be tested.

[0054] Step 8: Repeat step 7 until the flexible glass to be tested breaks. Record the number of repetitions N, which is the bending strength N of the flexible glass to be tested. max .

[0055] This invention can be used for bending tests of ultra-thin flexible glass, as well as any other flexible rolls, strips, etc., following the same testing process as for glass. First, set the bending radius r and the rotation angle α of the bending plates (first support plate and second support plate), where 0 < α ≤ 180°. Start motor 2 to begin the bending test until the sensor (detection device) detects failure of the flexible roll, strip, etc., and record the number of bends N. Repeat the above test and perform statistical analysis on the number of bends N to determine the fatigue life of the flexible roll, strip, etc.

[0056] like Figures 1-3 As shown, some embodiments of the present invention disclose a bending device for flexible sheets, which can be used for testing the ultimate bending radius and fatigue strength of flexible sheets such as ultra-thin flexible glass 8. The device includes a first support plate 13, a second support plate 6, and a rotating mechanism 9. The rotating mechanism 9 includes a horizontally arranged forward rotating shaft and a first rotating arm assembly mounted on the forward rotating shaft. The first support plate 13 and the second support plate 6 are arranged adjacently below the forward rotating shaft. The first rotating arm assembly connects to the first support plate 13, allowing the first support plate 13 to rotate relative to the forward rotating shaft, thereby changing the angle between the first support plate 13 and the second support plate 6. A detection device 7 can be provided to detect whether the sheet material to be tested is broken. The detection device 7 is arranged towards the adjacent area of ​​the first support plate 13 and the second support plate 6 to detect the breakage of the ultra-thin flexible glass 8.

[0057] The aforementioned first support plate 13, second support plate 6, and rotating mechanism 9 can be installed through the mounting box 1. In order to adjust the height of the second support plate 6, a height adjustment device can be provided. The height adjustment device is installed on the mounting box 1, and the second support plate 6 is fixed on the height adjustment device.

[0058] The first rotating arm assembly includes a first rotating arm 10, a first guide post 11, and a first sliding sleeve 12. The first end of the first rotating arm 10 is fixedly mounted on the forward rotating shaft. The upper end of the first guide post 11 is mounted on the second end of the first rotating arm 10. The first sliding sleeve 12 is vertically movable and fitted onto the first guide post 11, and is fixedly connected to the first support plate 13. The first guide post 11 includes a first positioning portion and a first guide portion extending downward from the first positioning portion. The lower part of the first guide portion is provided with an external thread. The first sliding sleeve 12 has a threaded hole, and the first sliding sleeve 12 is fitted onto the first guide portion through the threaded hole. Furthermore, the first rotating arm 10 is provided with a positioning light hole, and the first positioning portion is rotatably mounted on the positioning light hole. The first positioning portion includes an adjusting block blocking the upper end of the positioning light hole and a positioning rod passing through the positioning light hole. The first guide portion extends downward from the lower end of the positioning rod.

[0059] The height adjustment device described above may include a third guide post 4 and a rotating component. The rotating component has an adjustment threaded hole in the middle for the third guide post 4 to pass through, and the outer wall of the third guide post 4 is provided with external threads. The rotating component is rotatably fixed to the upper cover of the mounting box 1, and the third guide post 4 extends partially out of the upper surface of the rotating component so that the upper end of the third guide post 4 pushes up the second support plate 6.

[0060] In this embodiment, the chassis (mounting box 1) is used to carry the equipment and electrical control system. The motor 2 provides power and positions the first support plate 13. The glass 8 (the flexible sheet material to be tested) is placed on the first support plate 13 and the second support plate 6 and fixed. The second support plate 6 is fixed on the second guide post and can move up and down along the rotating rod 3 of the height adjustment device to keep the upper surface of the second support plate 6 horizontal. The knob 5 of the height adjustment device is used to precisely adjust the up and down position of the second support plate 6. The first sliding sleeve 12 is fixed to the first support plate 13 and can move precisely along the axial direction of the first guide post 11. The first guide post 11 is fixed on the first rotating arm 10 and can drive the first support plate 13 to rotate forward around the forward rotation axis of the rotating mechanism 9. The forward rotation axis is driven by the motor 2 through a chain, synchronous belt, or gear transmission. The sensor (detection device 7) is used to monitor the state of the glass 8.

[0061] like Figure 1As shown, in the initial state, the bending radius of glass 8 is set to r. The vertical position of the second support plate 6 is adjusted so that the distance between its upper surface and the center of the forward rotation axis is h, where h = r. The first guide post 11 is adjusted so that the upper surface of the first support plate 13 coincides with the upper surface of the second support plate 6 (located on the same plane). The locking knob 5 and the first guide post 11 are then used to fix the positions of the first support plate 13 and the second support plate 6. Glass 8 is placed on the upper surfaces of the first support plate 13 and the second support plate 6, and both ends of glass 8 are fixed to the first support plate 13 and the second support plate 6.

[0062] like Figure 2 As shown, motor 2 is started, and the first support plate 13 drives one end of the glass 8 to rotate around the positive rotation axis by an angle α, where 0 < α ≤ 180°. The sensor continuously monitors the state of the glass 8. When the glass 8 breaks, the electronic control system records the current value of α and calculates the current bending radius R of the glass 8 using the formula R = f(h, α). The distance h between the first support plate 13 and the second support plate 6 and the center of the positive rotation axis is adjusted so that h = R. The above bending action is repeated until α = 180° and the glass 8 does not break. The R value at this time is the minimum bending radius Rmin of the glass 8.

[0063] like Figure 3 As shown, after determining the minimum bending radius of glass 8, motor 2 is started, causing the first support plate 13 to rotate 180° around the positive rotation axis and then return to 0°. This bending action is repeated, and the number of bends N is recorded. The sensor continuously monitors the state of glass 8; when glass 8 breaks, the current number of bends N is recorded. The value of N at this point is the bending strength Nmax of glass 8. By repeating the bending test and statistically analyzing the number of bends N, the statistical fatigue life of glass 8 can be determined.

[0064] like Figures 4 to 6 As shown, some embodiments of the present invention disclose another bending device for flexible sheets, which can be used for testing the ultimate bending radius and fatigue strength of flexible sheets such as ultra-thin flexible glass 24. The device includes a first support plate 32, a second support plate 23, and a rotating mechanism 28. The rotating mechanism 28 includes a horizontally arranged forward rotating shaft and a first rotating arm assembly mounted on the forward rotating shaft, a reverse rotating shaft and a second rotating arm assembly mounted on the reverse rotating shaft. The rotating mechanism 28 also includes the repetition of the axes of the reverse rotating shaft and the forward rotating shaft.

[0065] The first support plate 32 and the second support plate 23 are arranged adjacently below the forward rotation axis. The first rotating arm assembly is connected to the first support plate 32, and the second rotating arm assembly is connected to the second support plate 23, allowing the second support plate 23 to rotate relative to the reverse rotation axis. A motor 22 and a transmission assembly drive the first and second rotating arm assemblies to rotate in opposite directions. Specifically, the motor 22 and the rotating assembly can be housed within the mounting box 21. The rotating assembly allows the first support plate 32 to rotate relative to the forward rotation axis and the second support plate 23 to rotate relative to the reverse rotation axis, thereby changing the angle between the first support plate 32 and the second support plate 23. A detection device 33 can be provided to detect whether the plate to be tested is broken. The detection device 33 is arranged towards the adjacent area of ​​the first support plate 32 and the second support plate 23.

[0066] In some embodiments, the first rotating arm assembly includes a first rotating arm 30, a first guide post 29, and a first sliding sleeve 31. A first end of the first rotating arm 30 is fixedly mounted on the forward rotating shaft. The upper end of the first guide post 29 is mounted on the second end of the first rotating arm 30. The first sliding sleeve 31 is vertically displaceable and fitted onto the first guide post 29, and the first sliding sleeve 31 is fixedly connected to the first support plate 32. The first guide post 29 includes a first positioning portion and a first guide portion extending downward from the first positioning portion. The lower part of the first guide portion is provided with an external thread. The first sliding sleeve 31 has a threaded hole, and the first sliding sleeve 31 is fitted onto the first guide portion through the threaded hole. Furthermore, the first rotating arm 30 is provided with a positioning light hole, and the first positioning portion is rotatably mounted on the positioning light hole. The first positioning portion includes an adjusting stop blocking the upper end of the positioning light hole and a positioning rod passing through the positioning light hole. The first guide portion extends downward from the lower end of the positioning rod.

[0067] Similarly, the second rotating arm assembly includes a second rotating arm 26, a second guide post 27, and a second sliding sleeve 25. The first end of the second rotating arm 26 is fixedly mounted on the forward rotating shaft, the upper end of the second guide post 27 is mounted on the second end of the second rotating arm 26, the second sliding sleeve 25 is vertically displaceable and fitted onto the second guide post 27, and the second sliding sleeve 25 is fixedly connected to the second support plate 23.

[0068] like Figure 4As shown, the chassis (mounting box 21) also serves to support the equipment and electrical control system. Motor 22 provides power and positions the first support plate 32 and the second support plate 23. Glass 24 is placed on and fixed to the first support plate 32 and the second support plate 23. Second sliding sleeve 25 is fixed to the second support plate 23 and can move precisely along the axis of the second guide post 27. The second guide post 27 is fixed to the second rotating arm 26 and can drive the second support plate 23 to rotate clockwise around the reverse rotation axis. First sliding sleeve 31 is fixed to the first support plate 32 and can move precisely along the axis of the first guide post 29. First guide post 29 is fixed to the first rotating arm 30 and can drive the first support plate 32 to rotate counterclockwise around the forward rotation axis. The first support plate 32, the second support plate 23, and their adjustment mechanisms are symmetrical about the equipment's centerline. The forward and reverse rotation axes of the rotating mechanism 28 are driven by the motor 22 via chain, synchronous belt, or gear transmission, causing the first support plate 32 and the second support plate 23 to rotate synchronously and in opposite directions. Sensors are used to monitor the state of the glass 24.

[0069] like Figure 4 As shown, in the initial state, the bending radius of the glass 24 (the flexible sheet material to be tested) is set to r. The vertical positions of the first support plate 32 and the second support plate 23 are adjusted so that their upper surfaces coincide and the center distance between them and the rotation axes (forward and reverse rotation axes) is h, where h = r. The first guide post 29 and the second guide post 27 are locked to fix the positions of the first support plate 32 and the second support plate 23. The glass 24 is placed on the upper surfaces of the first support plate 32 and the second support plate 23, and both ends of the glass 24 are fixed to the first support plate 32 and the second support plate 23.

[0070] like Figure 5 As shown, when motor 22 is started, the second support plate 23 drives one end of glass 24 to rotate clockwise by an angle β around the rotation axis; the second support plate 23 also drives the other end of glass 24 to rotate counterclockwise synchronously by an angle β around the rotation axis, where 0 < β ≤ 90°. The sensor continuously monitors the state of glass 24. When glass 24 breaks, the electronic control system records the current β value and calculates the current bending radius R of glass 24 using the formula R = f(h, β). The distance h between the first support plate 32 and the second support plate 23 and the center of the rotation axis is adjusted so that h = R. The above bending action is repeated until β = 90° and glass 24 does not break. The R value at this time is the minimum bending radius Rmin of glass 24.

[0071] like Figure 6As shown, after determining the minimum bending radius of glass 24, motor 22 is started, causing the first support plate 32 and the second support plate 23 to rotate synchronously and in opposite directions by 90° around the rotation axis, and then return to 0°. This bending action is repeated, and the number of bends N is recorded. The sensor continuously monitors the state of glass 24, and when glass 24 breaks, the current number of bends N is recorded. The value of N at this time is the bending strength Nmax of glass 24. By repeating the above bending test and statistically analyzing the number of bends N, the statistical fatigue life of glass 24 can be measured.

[0072] It should be noted that the components or steps in the above embodiments can be interchanged, substituted, added, or deleted. Therefore, the combinations formed by these reasonable permutations and transformations should also fall within the protection scope of this invention, and the protection scope of this invention should not be limited to the above embodiments.

[0073] The above are exemplary embodiments disclosed in this invention. The order of the disclosed embodiments is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of this invention (including the claims) is limited to these examples. Various changes and modifications can be made without departing from the scope defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular.

[0074] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of the different aspects of the invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method for testing the limit bending radius and fatigue strength of a flexible sheet material, characterized by, The bending device for flexible plate material is realized by adopting, The bending device for flexible plate material comprises a first supporting plate, a second supporting plate and a rotating mechanism; The rotating mechanism comprises a horizontal positive rotating shaft and a first rotating arm assembly installed on the positive rotating shaft; The first supporting plate and the second supporting plate are adjacently arranged below the positive rotating shaft; The first rotating arm assembly connects the first supporting plate, so that the first supporting plate can rotate relative to the positive rotating shaft, thereby changing the included angle between the first supporting plate and the second supporting plate; The test method comprises: Step one: setting an initial bending radius r of the flexible plate material to be detected; adjusting the height of the first supporting plate and the second supporting plate, so that the first supporting plate and the second supporting plate are located in the same plane and the first distance h between the center line of the positive rotating shaft and the first supporting plate and the second supporting plate is equal to the initial bending radius r; fixing the flexible plate material to be detected on the first supporting plate and the second supporting plate, which is recorded as the initial position of the first supporting plate and the second supporting plate; Step two: the rotating mechanism drives the first supporting plate to rotate, or the rotating mechanism drives the first supporting plate and the second supporting plate to synchronously rotate relative to each other; Step three: when the flexible plate material to be detected is broken, the sum of the angles α of the first supporting plate and the second supporting plate is recorded, and the current bending radius R of the plate is obtained through R=f(h, α), wherein 0°<α<180°; Step four: adjusting the height of the first supporting plate and the second supporting plate, so that the first supporting plate and the second supporting plate are located in the same plane and the first distance h between the center line of the rotating shaft and the first supporting plate and the second supporting plate is equal to the current bending radius R; Step five, repeat step two, step three, step four, until a=180°, and the flexible plate material to be detected does not break, at this time the first distance h between the first supporting plate and the second supporting plate and the center line of the rotating shaft is the minimum bending radius R of the flexible plate material to be detected min ; Step six sets the first distance h between the horizontal plane where the first supporting plate and the second supporting plate are located and the center line of the rotating shaft as the minimum bending radius R of the flexible sheet to be detected min ; Step seven: the rotating mechanism drives the first supporting plate to rotate, or the rotating mechanism drives the first supporting plate and the second supporting plate to synchronously rotate relative to each other, so as to bend the flexible plate material to be detected; Step eight repeat step seven, until the flexible plate material to be detected is broken, record the number of repetitions N, that is the bending strength N of the flexible plate material to be detected max .

2. The method for testing the limit bending radius and fatigue strength of a flexible sheet material according to claim 1, wherein The bending device for flexible plate material further comprises a detection device arranged towards the abutting portion of the first supporting plate and the second supporting plate.

3. The method for testing the limit bending radius and fatigue strength of a flexible sheet material according to claim 1 or 2, characterized in that, Further comprising a mounting box and a height adjusting device, the height adjusting device is installed on the mounting box, and the second supporting plate is fixed on the height adjusting device; The first rotating arm assembly comprises a first rotating arm, a first guide column and a first sliding sleeve, the first end of the first rotating arm is fixedly installed on the positive rotating shaft, the upper end of the first guide column is installed on the second end of the first rotating arm, the first sliding sleeve is movably sleeved on the first guide column, and the first sliding sleeve is fixedly connected with the first supporting plate.

4. The method for testing the limit bending radius and fatigue strength of a flexible sheet material according to claim 3, wherein The first guide column comprises a first positioning portion and a first guide portion formed by downward extending of the first positioning portion; The lower part of the first guide portion is provided with external threads, the first sliding sleeve is provided with a threaded hole, and the first sliding sleeve is sleeved on the first guide portion through the threaded hole; And, the first rotating arm is provided with a positioning light hole, and the first positioning portion is rotatably installed on the positioning light hole.

5. The method for testing the limit bending radius and fatigue strength of a flexible sheet material according to claim 4, wherein The first positioning portion comprises an adjusting block blocking the upper end of the positioning light hole and a positioning rod penetrating through the positioning light hole, and the first guide portion is formed by downward extending of the lower end of the positioning rod.

6. The method for testing the limit bending radius and fatigue strength of a flexible sheet material according to claim 3, wherein The height adjusting device comprises a third guide column and a rotating member, a regulating screw hole is formed in the middle of the rotating member for the third guide column to pass through, and an external thread is arranged on the outer wall of the third guide column; The rotating member is rotatably fixed on the upper cover of the mounting box, and the third guide column partially extends out of the upper surface of the rotating member so that the upper end of the third guide column lifts the second supporting plate.

7. The method for testing the limit bending radius and fatigue strength of a flexible sheet material according to claim 3, wherein The rotating mechanism further comprises a reverse rotating shaft and a second rotating arm assembly mounted on the reverse rotating shaft, the axis of the reverse rotating shaft coincides with that of the forward rotating shaft, and the rotating directions of the reverse rotating shaft and the forward rotating shaft are opposite. The second rotating arm assembly connects the second supporting plate so that the second supporting plate can rotate relative to the reverse rotating shaft.

8. The method for testing the limit bending radius and fatigue strength of a flexible sheet material according to claim 7, wherein The second rotating arm assembly comprises a second rotating arm, a second guide column and a second sliding sleeve, the first end of the second rotating arm is fixedly mounted on the forward rotating shaft, the upper end of the second guide column is mounted on the second end of the second rotating arm, the second sliding sleeve is movably sleeved on the second guide column, and the second sliding sleeve is fixedly connected with the second supporting plate.

9. The method for testing the limit bending radius and fatigue strength of a flexible sheet material according to claim 7, wherein Further comprising a motor and a transmission assembly, the motor is connected with the forward rotating shaft and the reverse rotating shaft through the transmission assembly, and the motor is arranged in the mounting box.

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