Flexible testing device and method and method for determining minimum winding radius of object

Abstract

The invention relates to the technical field of flexibility testing, and discloses a flexibility testing device and method and a method for determining the minimum winding radius of an object, and the flexibility testing device comprises a base, a sliding support, two moving seats and two adsorption plates; the two moving seats are both connected with the base in a sliding manner; the sliding support is arranged between the two movable seats and is in sliding connection with the base, the two adsorption plates are arranged on the two opposite sides of the sliding support respectively and are rotationally connected with the sliding support, the end, away from the sliding support, of one adsorption plate is rotationally connected with one movable seat, and the end, away from the sliding support, of the other adsorption plate is rotationally connected with the other movable seat; according to the scheme, the flexibility degree of the pole piece is objectively reflected through the moving stroke data of the moving seat or the moving stroke data of the sliding support, so that the flexibility of the pole piece can be quantitatively tested, subjective factors of people are reduced, the flexibility testing efficiency and accuracy of the pole piece are improved, and the pole piece flexibility testing device has the advantages of being simple in structure and convenient to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of flexibility testing, and in particular to a flexibility testing device and method, and a method for determining a minimum winding radius of an object. Background Art

[0002] The internal cells of current lithium-ion batteries (including positive electrode sheets, diaphragms and negative electrode sheets) adopt a stacking structure and a winding structure. Compared with the stacking method, the winding method has great requirements on the flexibility of the cell electrode sheets. Poorly flexible electrode sheets will have serious cracks during winding, which will cause powder loss and, in severe cases, belt breakage, which will lead to a decrease in the qualified rate of the battery cell and poor stability, and will have a great impact on the long cycle and safety performance of the battery cell in the future. However, the electrode sheets with excessive flexibility are prone to sticking to the roller during the rolling process, and cannot be produced normally, resulting in a large number of scraps. Therefore, in order to reduce the risk of coating cracking and active particle shedding of the electrode sheets and reduce the risk of electrode sheets sticking to the roller during the rolling process, it is necessary to select electrode sheets with better flexibility. At present, the detection method of the flexibility of the electrode sheets is mostly to detect by manually rolling around the steel needle, which depends largely on the experience and subjective judgment of the operator. The test indicators cannot be quantified, and the results measured by the same person will also have obvious deviations, resulting in poor accuracy of the test data. Therefore, there is an urgent need for a test device that can objectively reflect the flexibility of the electrode sheets with data. Summary of the invention

[0003] The present invention provides a flexibility testing device and method and a method for determining the minimum winding radius of an object, aiming to objectively reflect the flexibility of a pole piece with data.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A flexibility testing device comprises a base, a sliding bracket, two moving seats and two adsorption plates;

[0006] The two movable seats are both slidably connected to the base along a first direction, one of the movable seats is used to fix one end of the object to be tested, and the other movable seat is used to fix the other end of the object to be tested; the sliding bracket is arranged between the two movable seats and is slidably connected to the base along a second direction, the two adsorption plates are arranged on opposite sides of the sliding bracket and are both rotatably connected to the sliding bracket, one end of one adsorption plate away from the sliding bracket is rotatably connected to one of the movable seats, and the other end of the adsorption plate away from the sliding bracket is rotatably connected to the other movable seat.

[0007] In one of the technical solutions, the movable seat includes a base, a fixed plate, a support rod and a pressure roller;

[0008] The base is slidably connected to the pedestal along a first direction, a fixing structure is connected between the base and the fixing plate, the fixing plate is used to clamp the end of the object to be tested together with the base, the support rods are respectively connected to the base and the pressure roller, and the side of the base is provided with an adjustment groove extending along the first direction, one end of the support rod is connected to the adjustment groove, and the other end of the support rod is fixed to the pressure roller, the support rod is used to adjust the gap between the pressure roller and the base, and the pressure roller is used to clamp the object to be tested together with the base, and the end of the adsorption plate away from the sliding bracket is rotatably connected to the pressure roller.

[0009] In one of the technical solutions, a reference portion is provided on the base, and the distance between the pressure roller and the reference portion in the first direction remains unchanged.

[0010] In one of the technical solutions, the sliding bracket includes a sliding seat, an extension rod and a CCD module which are connected in sequence; the sliding seat is slidably connected to the base along the second direction, and the extension rod is rotatably connected to the two adsorption plates respectively.

[0011] In one of the technical solutions, the CCD module is fixed to the top of the extension rod facing away from the movable seat, the extension rod is provided with a through hole penetrating along the second direction, and the CCD module is arranged in the penetrating direction of the through hole.

[0012] In one of the technical solutions, the sliding bracket further includes a distance measuring module, which is fixed to the top of the extension rod facing away from the moving seat and is also located in the penetrating direction of the through hole.

[0013] In one of the technical solutions, the base is provided with a first scale on one side of the movable base, and the base is provided with a second scale on one side of the sliding bracket.

[0014] In one of the technical solutions, adsorption holes are provided on both adsorption plates, the lengths of the two adsorption plates are the same, and the first direction and the second direction are perpendicular to each other.

[0015] The present application also provides a flexibility testing method, which uses the flexibility testing device described above and includes the following steps:

[0016] Step S1: fixing one end of the object to be tested on one of the movable seats, and fixing the other end of the object to be tested on the other movable seat, and making the object to be tested in a flat and unfolded state;

[0017] Step S2: driving the two moving seats to move toward each other on a straight line in the first direction, so that the middle part of the object to be tested gradually deforms in the second direction. During this process, the two adsorption plates drive the sliding bracket to move along the second direction under the drive of the moving seats. The object to be tested is adsorbed by the two adsorption plates respectively during the deformation process in the second direction. When the object to be tested is deformed to an abnormality on the surface, the two moving seats or the sliding bracket are stopped from being driven.

[0018] Step S3: Determine the flexibility of the object according to the travel of the movable seat along the first direction or according to the travel of the sliding bracket along the second direction.

[0019] The present application also provides a method for determining a minimum winding radius of an object, comprising the following steps:

[0020] After executing step S1 and step S2 in claim 9, record the distance X that the two movable seats move in a straight line in the first direction or record the height H of the sliding bracket relative to the movable seat in the second direction, and assume that the length of the adsorption plate is L, where L 2 =H 2 + (LX) 2 , calculate the distance h0 between the top of the object to be tested in the second direction and the sliding bracket, and use any of the following formulas to calculate the minimum winding radius R of the object,

[0021] .

[0022] In one of the technical solutions, the height H of the sliding bracket relative to the moving seat in the second direction is recorded, the distance h between the top of the object to be tested in the second direction and the moving seat in the second direction is recorded, and h0 is calculated according to h0=Hh.

[0023] Compared with the prior art, the flexibility testing device provided by the present invention has at least the following beneficial effects:

[0024] Taking the battery pole piece as an example, the flexibility testing device of this scheme can be used in the following test method:

[0025] Step S1: fix one end of the pole piece on one of the movable seats, and fix the other end of the pole piece on another movable seat, and make the pole piece in a flat unfolded state;

[0026] Step S2: driving the two moving seats to move toward each other on a straight line in the first direction, so that the middle part of the pole piece gradually deforms in the second direction. During this process, the two adsorption plates drive the sliding bracket to move along the second direction under the drive of the moving seats. The pole piece will be adsorbed by the two adsorption plates during the deformation process in the second direction. When the pole piece is deformed to the point where the top surface is abnormal, the driving of the two moving seats or the sliding bracket is stopped.

[0027] Step S3: Determine the flexibility of the pole piece according to the travel of the movable seat along the first direction or according to the travel of the sliding bracket along the second direction.

[0028] To sum up, this scheme can objectively reflect the flexibility of the electrode by the travel data of the movable seat moving along the first direction or the travel data of the sliding bracket moving along the second direction. Therefore, it can quantify the flexibility of the electrode and reduce human subjective factors, thereby improving the efficiency and accuracy of the flexibility test of the electrode. The testing device of this scheme also has the advantages of simple structure and easy operation, which facilitates the rapid and accurate screening of the required electrode, and is beneficial to improve the production efficiency, qualified rate and service life of the battery under higher quality requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of a flexibility testing device provided in an embodiment of the present application in an initial state before testing a pole piece;

[0031] Figure 2 A schematic diagram of the structure of a flexibility testing device provided in an embodiment of the present application that drives a pole piece to bend;

[0032] Figure 3 for Figure 2 a front view of the structure shown;

[0033] Figure 4 A schematic diagram of the structure of the mobile base provided in the embodiment of the present application;

[0034] Figure 5 A schematic diagram of the structure of the adsorption plate provided in the embodiment of the present application;

[0035] Figure 6 A schematic diagram of the structure of a sliding bracket provided in an embodiment of the present application;

[0036] Figure 7 This is a simplified structural diagram of the flexibility testing device when the pole piece is deformed upward to the point where an abnormality just occurs on the surface.

[0037] Reference numerals:

[0038] 1. base; 11. bottom plate; 111. slideway; 12. side plate; 121. guide groove;

[0039] 2. Sliding bracket; 21. Sliding seat; 22. Extension rod; 221. Through hole; 23. CCD module; 24. Nut; 25. Distance measurement module;

[0040] 3. Moving seat; 31. Base; 311. Guide rail; 312. Reference part; 313. Adjustment slot; 32. Fixed plate; 33. Support rod; 34. Pressing roller; 35. Boss; 36. Fixed structure;

[0041] 4. Adsorption plate; 41. Adsorption hole; 5. First scale; 6. Second scale; 10. Pole piece. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0044] It should be understood that the orientations or positional relationships indicated by terms such as "upper", "lower", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0047] Please also read Figures 1 to 6 The embodiment of the present invention provides a flexibility testing device, which mainly includes a base 1, a sliding bracket 2, two moving seats 3 and two adsorption plates 4, wherein the two moving seats 3 are slidably connected to the base 1 along a first direction X, one of the moving seats 3 is used to fix one end of the object to be tested, and the other moving seat 3 is used to fix the other end of the object to be tested, wherein the sliding bracket 2 is arranged between the two moving seats 3, and the sliding bracket 2 is slidably connected to the base 1 along a second direction Z; wherein the two adsorption plates 4 are respectively arranged on two opposite sides of the sliding bracket 2 in the first direction X, and the two adsorption plates 4 are rotatably connected to the sliding bracket 2, and the two adsorption plates 4 are provided with adsorption holes 41 for adsorbing the object to be tested, and one end of one adsorption plate 4 away from the sliding bracket 2 is rotatably connected to one of the moving seats 3, and the other end of the other adsorption plate 4 away from the sliding bracket 2 is rotatably connected to the other moving seat 3. Among them, the lengths L of the two adsorption plates 4 are preferably the same, and the first direction X and the second direction Z are perpendicular to each other, so that when the two movable seats 3 move closer to each other (i.e. move towards each other) along a straight line in the first direction X, the sliding bracket 2 can move in a straight line along a Z direction perpendicular to the X direction, wherein the first direction X is preferably parallel to the horizontal direction, and the second direction Z is preferably parallel to the vertical direction.

[0048] The object to be tested in this embodiment is a battery electrode 10 as an example. When the flexibility testing device of this embodiment is used, the following testing method can be used:

[0049] Step S1: Figure 1 As shown, one end of the pole piece 10 is fixed on one of the movable seats 3, and the other end of the pole piece 10 is fixed on another movable seat 3, and the pole piece 10 is in a flat unfolded state;

[0050] Step S2: Figure 2 or Figure 3 As shown, the two moving seats 3 are driven to move toward each other on a straight line in the first direction X, so that the middle part of the pole piece 10 is gradually deformed in the second direction Z. In this process, the two adsorption plates 4 drive the sliding bracket 2 to move along the second direction Z under the drive of the moving seat 3. The pole piece 10 will be adsorbed by the two adsorption plates 4 during the deformation process in the second direction Z. When the pole piece 10 is deformed to the point where an abnormality occurs on the top surface, the two moving seats 3 are stopped from being driven or the sliding bracket 2 is stopped from being driven to move. The judgment standard for the abnormality on the surface of the pole piece 10 may be the occurrence of cracks or the occurrence of active material powdering.

[0051] Step S3: Fix the positions of the two movable seats 3 relative to the base 1 at this time, or fix the position of the sliding bracket 2 relative to the base 1 at this time, and judge the flexibility of the pole piece 10 according to the movement stroke of the movable seat 3 along the first direction X or the movement stroke of the sliding bracket 2 along the second direction Z.

[0052] The above-mentioned flexibility testing method can objectively reflect the flexibility of the pole piece 10 by the travel data of the movable seat 3 moving along the first direction X or the travel data of the sliding bracket 2 moving along the second direction Z. Therefore, the flexibility of the pole piece 10 can be quantitatively tested, reducing human subjective factors and improving the flexibility test efficiency and accuracy of the pole piece 10. The testing device of this scheme also has the advantages of simple structure and easy operation, so that it is convenient to quickly and accurately screen out the required pole piece 10, which is beneficial to improve the production efficiency, qualified rate and service life of the battery under higher quality requirements.

[0053] Please also read Figure 1 and Figure 2 The base 1 is provided with a first scale 5 on one side of the movable base 3, and the base 1 is provided with a second scale 6 on one side of the sliding bracket 2. By setting the first scale 5, the movement stroke of the movable base 3 along the first direction X can be intuitively read out, and by setting the second scale 6, the movement stroke of the sliding bracket 2 along the second direction Z can be intuitively read out, so that the operator can quickly obtain the result of the flexibility of the pole piece.

[0054] Please also read Figures 1 to 3 The base 1 specifically includes a bottom plate 11 and a side plate 12 fixed on the bottom plate 11. In fact, the two moving seats 3 are slidably connected to the bottom plate 11 along the first direction X. In fact, the sliding bracket 2 is slidably connected to the side plate 12 in the second direction Z. By splitting the base 1 into the bottom plate 11 and the side plate 12, it has the advantages of low processing cost and easy assembly, and can achieve the sliding connection between the base 1 and the two moving seats 3 and the sliding bracket 2 at a relatively low cost. Preferably, two slide grooves 111 are provided on the bottom plate 11, and the two slide grooves 111 extend along the first direction X. The two moving seats 3 are respectively inserted into the two slide grooves 111 and can slide along the slide grooves 111 in the first direction X. Preferably, a through guide groove 121 is provided on the side plate 12, and the guide groove 121 extends in the second direction Z. The sliding bracket 2 is penetrated in the guide groove 121 and can slide along the guide groove 121 in the second direction Z.

[0055] See also Figure 4The movable seat 3 specifically includes a base 31, a fixed plate 32, a support rod 33 and a pressure roller 34, wherein the top surface of the base 31 is used for placing the pole piece 10, and the bottom of the base 31 is provided with two downwardly protruding guide rails 311, and the guide rails 311 are embedded in a corresponding slide groove 111 to realize the sliding connection between the bottom plate 11 and the base 1 along the first direction X; wherein the fixed plate 32 is arranged on the top of the base 31, and a fixing structure 36 is connected between the base 31 and the fixed plate 32, and the fixing structure 36 can be a bolt or a nut, and the fixing structure 36 is used to fix the fixing plate 32 on the base 31, and the fixing plate 32 is used to clamp the end of the pole piece 10 together with the base 31, so that when the movable seat 3 moves in the first direction X, the pole piece 10 is The end of the pole piece 10 can move with the moving seat 3; wherein the support rod 33 is respectively connected to the base 31 and the pressure roller 34, and the support rod 33 is used to adjust the gap between the pressure roller 34 and the base 31 to ensure that the pressure roller 34 can clamp the pole piece 10 together with the base 31 before the flexibility test. By setting the pressure roller 34, when the two moving seats 3 move toward each other on the straight line of the first direction X, the pressure rollers 34 on the two moving seats 3 can push the middle part of the pole piece 10 to deform upward. In other words, the force applied by the pressure roller 34 on the pole piece 10 has an upward component force, so that the stress inside the pole piece 10 is always concentrated on the top during the upward deformation of the pole piece 10, thereby improving the flexibility test accuracy of the pole piece 10. The end of the above-mentioned adsorption plate 4 away from the sliding bracket 2 is actually rotatably connected to this pressure roller 34 at the convex column 35.

[0056] Please also read Figure 3 and Figure 4 When it is necessary to perform a flexibility test on a pole piece 10 of another thickness, the fasteners connected between the support rod 33 and the base 31 can be loosened first. At this time, the support rod 33 can rotate relative to the base 31, and then the pole piece 10 to be tested is allowed to pass through the gap between the pressure roller 34 and the base 31, and then the pressure roller 34 is pressed on the pole piece 10 to be tested due to its own weight, and then the support rod 33 is re-locked on the base 31 using the fasteners. The operation of the other moving seat 3 is the same as above and will not be repeated. At this time, the flexibility test of the pole piece 10 of another thickness can be performed.

[0057] Please refer to the Figure 3 and Figure 4 In order to ensure that the preconditions for testing the pole pieces 10 of different thicknesses are the same to improve the accuracy of the test, after the height adjustment of the pressing roller 34 is completed, the pressing roller 34 also needs to be aligned with the reference portion 312 on the base 31 in the first direction X to ensure that the flexibility test device is in the same direction as the above. Figure 1In the initial state shown, the initial distances of the pressure rollers 34 on the two movable seats 3 are the same, that is, the flexibility test is performed on the middle sections of the same spacing on the pole pieces 10 of different thicknesses, thereby ensuring the accuracy of the flexibility test on the pole pieces 10 of different thicknesses. In this embodiment, the reference portion 312 is preferably a side surface of the base 31, and further preferably, the surface of the pressure roller 34 needs to be tangent to the reference portion 312 after the height is adjusted. Preferably, the base 31 is provided with an adjustment groove 313 extending along the first direction X, and one end of the support rod 33 away from the pressure roller 34 is inserted into the adjustment groove 313. When the fastener between the support rod 33 and the base 31 is loosened, one end of the support rod 33 can be rotated in the adjustment groove 313 and can also slide along the adjustment groove 313, thereby achieving the purpose that the pressure roller 34 can be adjusted in height and adjusted to be tangent to the reference portion 312.

[0058] Please also read Figures 1 to 3 and Figure 6 The sliding bracket 2 specifically includes a sliding seat 21, an extension rod 22 and a CCD module 23 which are connected in sequence, wherein the sliding seat 21 is slidably connected to the base 1 along the second direction Z, two adsorption plates 4 are arranged on both sides of the extension rod 22, the extension rod 22 is rotatably connected to the two adsorption plates 4, and the CCD module 23 is fixed on the extension rod 22. When it is seen from the CCD module 23 that the pole piece 10 is deformed in the second direction Z to the point where the surface is abnormal, the sliding seat 21 can be fixed to the base 1 by using a nut 24, so that the flexibility of the pole piece 10 can be measured according to the travel of the sliding seat 21 in the second direction. Preferably, the CCD module 23 is fixed on the top of the extension rod 22 facing away from the moving seat 3. Based on this, a through hole 221 penetrating in the second direction Z is provided on the extension rod 22 of the present solution, and the CCD module 23 is provided in the penetrating direction of the through hole 221, so that the through hole 221 plays a role in avoiding the CCD module 23 from detecting the pole piece 10, so that the lens on the CCD module 23 can detect the top surface of the pole piece 10 through the through hole 221. Among them, the CCD module 23 can be connected to a display, so that it is more convenient for the operator to observe from the display whether there is any abnormality on the top surface of the pole piece 10 during the deformation process, thereby improving the test efficiency of the operator.

[0059] Please refer to the Figures 1 to 3 and Figure 6The sliding bracket 2 also includes a distance measuring module 25 fixed on the extension rod 22. The distance measuring module 25 can be used to detect the distance h0 from itself to the top surface of the pole piece 10 that is bent. When the outer dimensions of the extension rod 22 and the distance measuring module 25 are ignored, this distance h0 can also be understood as being equivalent to the distance between the top surface of the pole piece 10 and the extension rod 22. If the accuracy of the detection value is required to be high, the distance between the top surface of the pole piece 10 and the extension rod 22 can be calculated based on the actual installation position of the distance measuring module 25 and the outer dimensions of the extension rod 22 and the distance measuring module 25. The distance between the top surface of the pole piece 10 and the extension rod 22 can be calculated using the data of the distance measuring module 25. In this embodiment, the distance measuring module 25 is preferably also fixed on the top of the extension rod 22 facing away from the moving seat 3 and is also located in the penetration direction of the through hole 221, so that the through hole 221 also plays a role in testing and avoiding the distance measuring module 25. In addition, the distance measuring module 25 can also be used to detect the distance H between the sliding bracket 2 and the moving seat 3 in the second direction Z.

[0060] This embodiment also provides a method for determining the minimum winding radius of the pole piece. This method preferably uses the distance measurement module 25 described in the previous paragraph. Specifically, this method needs to first perform the above-mentioned "step S1" and the above-mentioned "step S2" so that the top of the pole piece 10 in the second direction Z is deformed upward until an abnormal state just occurs. At this time, you can refer to Figure 7 , Figure 7 The figure shows a schematic diagram of the flexibility test device corresponding to the case where the pole piece 10 is deformed upward until an abnormality occurs on the surface, wherein point A can be understood as the end position of the sliding bracket 2 after moving along the second direction Z, and point B can be understood as the end position of the left movable seat 3 after moving along the first direction X, that is, segment AB can be understood as the length of an adsorption plate 4, and the length of segment AB is assumed to be L, wherein point C is the middle position of the two movable seats 3, and point C is also the position point where point A is projected downward, wherein point F represents the position point where the pole piece 10 is deformed upward until an abnormality occurs on the top surface, ⊙E passes through point F and is tangent to segment AB, a line segment perpendicular to segment AB is made through point E and intersects segment AB at point D, and DE represents the minimum radius R of the winding of the pole piece 10. If the winding radius R' of the pole piece 10 wound on the steel needle exceeds this radius R, the pole piece 10 will not have cracks or powder falling problems after winding; if the winding radius R' of the pole piece 10 wound on the steel needle is less than this radius R, the pole piece 10 is very likely to have cracks or powder falling problems after winding.

[0061] The specific steps of the method for determining the minimum winding radius of the pole piece provided in this embodiment are:

[0062] After executing the above steps S1 and S2, record the distance X that the two moving seats 3 move in the straight line in the first direction X or record the height H that the sliding bracket 2 moves in the second direction Z. According to the Pythagorean theorem, L 2 =H2 + (LX) 2 In other words, when L is a constant value, if X is measured, the corresponding H can be calculated at the same time, and if H is measured, the corresponding X can be calculated at the same time; when L is unknown, it can be calculated by measuring X and H and then using the Pythagorean theorem. 2 =H 2 + (LX) 2 That is, L is calculated. This solution also needs to use the distance measurement module 25 to directly or indirectly measure the distance h0 between the top of the pole piece 10 in the second direction Z and the extension rod 22. Since △ABC and △ADE are similar, the minimum winding radius R of the pole piece can be calculated according to the following formula:

[0063]

[0064] Among them, DE=R, BC=LX= , AE=AF+EF=AF+DE=h0+R, AB=L,

[0065] Then the above formula is equivalent to:

[0066] ,

[0067] Or, equivalently:

[0068] .

[0069] Please refer again Figure 7 , the above h0 can be obtained in the following two ways:

[0070] The first method of obtaining h0 is to design the distance measuring module 25 to directly detect the distance from itself to the bent top surface of the pole piece 10. When the size error of the distance measuring module 25 itself and the size error of the extension rod 22 are ignored, the result detected by the distance measuring module 25 is equivalent to h0.

[0071] The second way to get h0: using Figure 1 The second scale 6 shown in FIG. 1 reads the height H of the sliding bracket 2 in the second direction Z, and at the same time uses Figure 1 The second scale 6 shown in the figure reads the distance h between the top of the pole piece 10 in the second direction Z and the movable seat 3 in the second direction Z, and then calculates h0 according to the formula h0=Hh.

[0072] The method for determining the minimum winding radius of the pole piece provided in this embodiment has the advantages of simplified operation, simplified calculation and high accuracy of the test results obtained.

[0073] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementations of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A flexibility testing device, characterized in that: It comprises a base (1), a sliding bracket (2), two moving seats (3) and two adsorption plates (4); The two movable seats (3) are both slidably connected to the base (1) along a first direction, the sliding bracket (2) is arranged between the two movable seats (3) and is slidably connected to the base (1) along a second direction, the two adsorption plates (4) are arranged on opposite sides of the sliding bracket (2) and are both rotatably connected to the sliding bracket (2), one end of one adsorption plate (4) away from the sliding bracket (2) is rotatably connected to one of the movable seats (3), and the other end of the other adsorption plate (4) away from the sliding bracket (2) is rotatably connected to the other movable seat (3).

2. The flexibility testing device according to claim 1, characterized in that: The movable seat (3) comprises a base (31), a fixing plate (32), a support rod (33) and a pressure roller (34); The base (31) is slidably connected to the pedestal (1) along a first direction; a fixing structure (36) is connected between the base (31) and the fixing plate (32); the support rod (33) is respectively connected to the base (31) and the pressing roller (34); an adjustment groove (313) extending along the first direction is provided on a side surface of the base (31); one end of the support rod (33) is connected to the adjustment groove (313); the other end of the support rod (33) is fixed to the pressing roller (34); and one end of the adsorption plate (4) away from the sliding bracket (2) is rotatably connected to the pressing roller (34).

3. The flexibility testing device according to claim 2, characterized in that: A reference portion (312) is provided on the base (31), and the distance of the pressure roller (34) relative to the reference portion (312) in the first direction remains unchanged.

4. The flexibility testing device according to claim 1, characterized in that: The sliding bracket (2) comprises a sliding seat (21), an extension rod (22) and a CCD module (23) which are connected in sequence; the sliding seat (21) is slidably connected to the base (1) along a second direction, and the extension rod (22) is rotationally connected to the two adsorption plates (4) respectively.

5. The flexibility testing device according to claim 4, characterized in that: The CCD module (23) is fixed to the top of the extension rod (22) facing away from the movable seat (3); the extension rod (22) is provided with a through hole (221) penetrating along the second direction; and the CCD module (23) is arranged in the penetrating direction of the through hole (221).

6. The flexibility testing device according to claim 5, characterized in that: The sliding bracket (2) further comprises a distance measuring module (25), wherein the distance measuring module (25) is fixed to the top of the extension rod (22) facing away from the moving seat (3) and is also located in the penetration direction of the through hole (221).

7. The flexibility testing device according to claim 1, characterized in that: The base (1) is provided with a first scale (5) on one side of the movable base (3), and the base (1) is provided with a second scale (6) on one side of the sliding bracket (2).

8. The flexibility testing device according to claim 1, characterized in that: Adsorption holes (41) are provided on both adsorption plates (4), the two adsorption plates (4) have the same length, and the first direction and the second direction are perpendicular to each other.

9. A flexibility testing method, characterized in that: The flexibility testing device according to any one of claims 1 to 8 is used, comprising the following steps: Step S1: fixing one end of the object to be tested on one of the movable seats (3), and fixing the other end of the object to be tested on another movable seat (3), and placing the object to be tested in a flat and unfolded state; Step S2: driving the two movable seats (3) to move towards each other on a straight line in the first direction, so that the middle part of the object to be tested gradually deforms in the second direction. During this process, the two adsorption plates (4) drive the sliding bracket (2) to move along the second direction under the drive of the movable seats (3). The object to be tested is adsorbed by the two adsorption plates (4) respectively during the process of deformation in the second direction. When the object to be tested is deformed to the point where an abnormality appears on the surface, the driving of the two movable seats (3) or the driving of the sliding bracket (2) is stopped. Step S3: judging the degree of flexibility of the object according to the travel of the movable seat (3) along the first direction or according to the travel of the sliding bracket (2) along the second direction.

10. A method for determining the minimum winding radius of an object, characterized in that: The following steps are involved: After executing step S1 and step S2 in claim 9, record the distance X that the two movable seats (3) move in a straight line in the first direction or record the height H of the sliding bracket (2) relative to the movable seat in the second direction, and assume that the length of the adsorption plate (4) is L, where L 2 =H 2 + (LX) 2 , calculate the distance h0 between the top of the object to be tested in the second direction and the sliding bracket (2), and calculate the minimum winding radius R of the object using the following formula: ； The distance h between the top of the object to be tested in the second direction and the moving seat (3) in the second direction is recorded, and h0 is calculated according to h0=Hh.

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