A film surface tension inspection device and system

Abstract

The application relates to the technical field of film surface inspection, in particular to a film surface tension inspection device and system, which comprises a guide support, a guide roller and an elastic piece. The guide support comprises a fixed frame and a movable frame, the movable frame is movably connected with the fixed frame, and the movable frame and the fixed frame are arranged at an included angle. The guide roller is arranged on the movable frame and is used for guiding a film to be measured. The elastic piece is used for connecting the fixed frame and the movable frame. During film surface tension inspection, the movable frame can rotate relative to the fixed frame, and the elastic piece is used for realizing mechanical balance. The change of the relative angle and the change of the tension of the elastic piece form a quantitative index of the film surface tension state, the film surface inspection effects of a production end and a customer end are consistent, inspection deviations caused by inconsistent standards between the two are reduced, and the return rate is reduced. The film surface tension inspection device is simple in structure, subjectivity of pure manual judgment is avoided, and a simple and intuitive standard quantitative device is provided for quality control of the film surface tension state.

Description

Technical Field

[0001] This application relates to the field of membrane surface inspection technology, and more specifically to a membrane surface tension inspection device and system. Background Technology

[0002] Membranes are thin film materials with flexible and rollable properties, including plastic films, metal films, or fiber films. These membrane materials differ in material, performance, and use due to different application scenarios, but all must pass tension tests to ensure flatness and tension stability during transportation and processing.

[0003] Defects in the appearance of battery separator membranes can affect battery manufacturing processes and yield rates, making membrane appearance inspection a necessary inspection item. Currently, the methods for inspecting battery separator membranes involve inspectors directly pulling on the membrane surface to check tension, and customer-side quality inspectors also directly pulling on the membrane surface for random checks. Because the tension cannot be quantified and standardized during membrane pulling, inconsistencies in membrane surface judgments can occur between the two methods. This can easily lead to inspection deviations when delivering finished membranes, resulting in product returns.

[0004] Therefore, there is an urgent need for a device that can standardize and unify the inspection conditions between both parties, thereby reducing inspection deviations. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a membrane tension testing device and system that can standardize and quantify membrane tension, ensuring consistent membrane tension for each person during testing and avoiding returns due to testing deviations.

[0006] According to the first aspect, this application provides a membrane tension testing device, comprising: A guide bracket, comprising a fixed frame and a movable frame, wherein the movable frame is arranged at an angle to the fixed frame and is movably connected to the fixed frame to change the size of the angle; Guide rollers, which are disposed on the movable frame, are used to guide the membrane to be tested; and An elastic element is connected between the fixed frame and the movable frame to balance the tension when the movable frame moves.

[0007] In some alternative embodiments, there are two movable frames, which are disposed on the fixed frame, and the guide roller is clamped between the two movable frames.

[0008] In some alternative embodiments, the elastic element is a spring, one end of which is connected to the fixed frame and the other end of which is connected to the movable frame, and the axis of the spring is perpendicular to the rotation axis of the movable frame.

[0009] In some alternative embodiments, the fixing frame is constructed as a telescopic structure; the fixing frame includes a base rod, an extension rod, and a fixing member, wherein the extension rod is inserted into the base rod and is capable of moving along the axial direction of the base rod to adjust the length of the fixing frame.

[0010] In some optional embodiments, the base rod is provided with a plurality of first mounting holes, which are arranged sequentially along the axial direction of the base rod. The extension rod is provided with a second mounting hole, and the fastener passes through the first mounting hole and the second mounting hole in sequence to fix the base rod and the extension rod.

[0011] In some optional embodiments, the bottom of the mounting frame is provided with a base, the bottom of the base is provided with wheels, and the projection of the mounting frame on the base coincides with the center line of the base.

[0012] According to a second aspect, this application provides a film tension testing system, including a film tension testing device and an unwinding device as described above, wherein the unwinding device is used to unwind the film to be tested to the film tension testing device.

[0013] In some alternative embodiments, the unwinding device includes an unwinding bracket and a rotating shaft, the rotating shaft being rotatably mounted on the unwinding bracket and arranged parallel to the guide roller.

[0014] In some optional embodiments, the membrane tension testing system further includes a protractor and / or a tension measuring device.

[0015] In some alternative embodiments, the unwinding device includes a field turnover device.

[0016] According to the membrane tension inspection device and system in this embodiment, the membrane tension inspection device includes a guide bracket, a guide roller, and an elastic element. The guide bracket includes a fixed frame and a movable frame that can move relative to each other, and the elastic element connects the movable frame and the fixed frame. During membrane tension inspection, the movable frame can rotate relative to the fixed frame, and the elastic element is used to achieve mechanical balance. The change in the relative angle and the change in the tension of the elastic element form a quantitative index of the membrane tension state. This quantitative index ensures that the membrane inspection effect at the production end and the customer end is consistent, reducing the inspection deviation caused by the lack of standardization between the two, thereby reducing the return rate. The membrane tension inspection device has a simple structure, combining mechanization and manual pulling. It retains the flexibility of manual operation and realizes the quantitative inspection of tension through mechanical structure, avoiding the subjectivity of purely manual judgment. It is suitable for scenarios such as rapid on-site verification, providing a simple and intuitive standard quantitative device for quality control of membrane tension state. Attached Figure Description

[0017] Figure 1This is a front view of the structure of a membrane tension testing device in one embodiment; Figure 2 This is a side view of the structure of a membrane tension testing device in one embodiment; Figure 3 This is a schematic diagram of the mounting bracket projected onto the base in one embodiment; Figure 4 This is a schematic diagram of the structure of a membrane tension testing system in one embodiment.

[0018] The components include: 1. Membrane tension testing device; 11. Guide bracket; 111. Fixing frame; 1111. Base rod; 1112. Extension rod; 1113. Fixing element; 1114. First mounting hole; 1115. Second mounting hole; 112. Movable frame; 1121. First movable frame; 1122. Second movable frame; 12. Guide roller; 13. Elastic element; 14. Base; 15. Traveling wheel; 2. Unwinding device; 21. Unwinding bracket; 22. Rotary shaft; 3. The membrane to be tested; X, axial direction; R, axis of rotation; L, central axis. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0020] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0021] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0022] Embodiments of this application provide a membrane tension inspection device, which can be used to inspect whether the tension of various flexible membrane materials (such as plastic film, metal foil, paper film, fiber film, etc.) meets preset standards during transportation and processing, providing a basis for quality control of subsequent membrane processing (such as slitting, printing, lamination, and winding). It is particularly suitable for the inspection of the membrane surface of finished battery separators.

[0023] The membrane tension testing device of this application includes a guide support composed of a fixed frame and a movable frame, a guide roller disposed on the movable frame, and an elastic element connecting the fixed frame and the movable frame. During testing, the elastic element is initially in a pre-tightened state, maintaining an initial angle between the movable frame and the fixed frame. At this time, the guide roller is in its initial position. After manually pulling the membrane to be tested, the membrane is passed through the guide roller, and the membrane is further pulled to initially tension the membrane surface (or eliminate the slack state). At this time, the membrane surface of the membrane to be tested initially contacts the surface of the guide roller, generating slight pressure. The operator gradually increases the pulling force, increasing the membrane tension. The membrane to be tested will generate a pulling force on the guide roller along the membrane surface direction. This pulling force is decomposed into forces perpendicular to the axis of the guide roller. The force pushes the movable frame to rotate around the rotation axis in a direction away from the fixed frame (e.g., increasing the angle from an initial 10° to 20°). As the movable frame rotates, it stretches (or compresses) the elastic element, which generates a counter-elastic force, balancing the membrane tension (the greater the membrane tension, the larger the rotation angle of the movable frame, and the more pronounced the deformation of the elastic element). At this point, a quantitative indicator of the membrane tension can be formed by measuring the spring tension or the angle between the movable frame and the fixed frame support. This quantitative indicator ensures consistent membrane inspection results between the production and customer ends. Controllable membrane tension ensures consistency, reducing inspection deviations caused by inconsistent standards and thus lowering the return rate. This membrane tension inspection device has a simple structure, combining mechanization and manual pulling. It retains the flexibility of manual operation while achieving quantitative tension inspection through a mechanical structure, avoiding the subjectivity of purely manual judgment. It is suitable for scenarios such as rapid on-site verification, providing a simple and intuitive standard quantitative device for quality control of membrane tension.

[0024] Please see Figures 1 to 3 The membrane tension testing device 1 includes a guide bracket 11, a guide roller 12, and an elastic element 13.

[0025] Please see Figure 1The guide bracket 11 serves as the supporting structure for the entire membrane tensioning device and is also one of the key components for quantifying membrane tension. It includes a fixed bracket 111 and a movable bracket 112. The movable bracket 112 is set at an angle to the fixed bracket 111 and is movably connected to it to change the angle. Specifically, before membrane inspection, the movable bracket 112 and the fixed bracket 111 are set at an initial angle, which is an acute angle (less than 90°), ensuring that the angle change corresponding to the standard tension of the membrane 3 under test falls entirely within the measurable range of the device. Since the standard tensions of different membranes 3 under test vary greatly, the size of the initial angle between the fixed bracket 111 and the movable bracket 112 directly determines the membrane tension level that the device can adapt to. Specifically, the corresponding initial angle can be calculated based on the standard tension of the membrane 3 under test. For example, when the test film 3 is a PET (polyethylene terephthalate) film, the standard tension of the PET film corresponds to an angle variation of 15°-25°, and the initial angle is set at about 15° (that is, set near the lower limit of the standard tension angle range of the test film 3).

[0026] In some embodiments, the movable frame 112 and the fixed frame 111 can be rotatably connected by a hinge structure. For example, the movable frame 112 and the fixed frame 111 can be movably connected by a hinge or a pivot.

[0027] In some embodiments, two movable frames 112 are provided, and the two movable frames 112 are disposed on the fixed frame 111. The guide roller 12 is clamped between the two movable frames 112, making the installation of the guide roller 12 more stable. When guiding the film 3 to be tested, it can apply force to the film surface more stably, ensuring that the film 3 to be tested maintains a stable posture during the inspection process, thereby improving the reliability of the inspection. In this case, only one film 3 to be tested can be inspected simultaneously on each film tension inspection device 1. The film tension inspection device 1 can be miniaturized, which helps to improve its flexibility of use and movement. Of course, multiple movable frames 112 can also be provided, with a guide roller 12 clamped between every two movable frames 112, so that multiple rolls of film 3 to be tested can be inspected simultaneously on the same film tension inspection device. Integrating multiple guide rollers 12 into one device can improve inspection efficiency and reduce the occupied area. For example, please refer to Figure 2 The movable frame 112 includes a first movable frame 1121 and a second movable frame 1122. The first movable frame 1121 and the second movable frame 1122 are spaced apart on the fixed frame 111, and a guide roller 12 is clamped between them.

[0028] In some embodiments, a reinforcing rod may be provided between the two movable frames 112 to improve their fixed stability, thereby preventing them from shaking and affecting the accuracy of the measurement results.

[0029] Guide roller 12 is mounted on movable frame 112 to guide the membrane 3 to be tested. After the membrane 3 comes into contact with guide roller 12, as the tension applied to the membrane 3 increases, the guide roller 12 and movable frame 112 rotate relative to fixed frame 111 under the action of the membrane 3. The change in the angle between movable frame 112 and fixed frame 111 provides a quantitative standard for membrane tension testing. Figure 1 As shown in the figure, the arrows indicate the rotation direction of the movable frame 112 after a tension is applied to the membrane 3 under test.

[0030] The elastic element 13 is connected between the fixed frame 111 and the movable frame 112 to balance the tension of the movable frame 112 during movement. When the surface tension of the membrane 3 to be tested acts on the guide roller 12, it will push the movable frame 112 to rotate around the rotation axis R. At this time, the elastic element 13 is stretched (or compressed) to generate a reverse elastic force. The greater the surface tension of the membrane, the greater the rotation amplitude of the movable frame 112, the greater the deformation of the elastic element 13, and the greater the elastic force. The membrane surface tension test can be further quantified and standardized by measuring this elastic force.

[0031] It should be noted that in this application, "rotation axis R" refers to the central axis L at the connection between the movable frame 112 and the fixed frame 111. For example, if the movable frame 112 is hinged to the fixed frame 111 by a cylindrical pin, then the central axis L of the cylindrical pin is the axis around which the movable frame 112 rotates. In this case, the movable frame 112 can swing relative to the fixed frame 111 about this rotation axis R, thereby changing the angle between it and the fixed frame 111, and thus, in conjunction with components such as the elastic element 13, exerting an effect on the membrane surface tension.

[0032] In some embodiments, the elastic element 13 is a spring, one end of which is connected to the fixed frame 111 and the other end is connected to the movable frame 112. The axis of the spring is perpendicular to the rotation axis R of the movable frame 112, so that the spring can more effectively apply elastic force to the movable frame 112. When the movable frame 112 rotates, the spring can provide a stable and mechanically compliant tension or elastic force, ensuring the stability of the mechanical basis for the membrane tension test.

[0033] In other embodiments, the elastic element 13 may also be an elastic rope.

[0034] In some embodiments, the fixing frame 111 is configured as a telescopic structure. The fixing frame 111 includes a base rod 1111 and an extension rod 1112. The extension rod 1112 is inserted into the base rod 1111 and can move along the axial direction X of the base rod 1111 to adjust the length of the fixing frame 111.

[0035] In some embodiments, the fixing frame 111 includes a base rod 1111, an extension rod 1112, and a fixing member 1113. The extension rod 1112 is inserted into the base rod 1111 and can move along the axial direction X of the base rod 1111. The fixing member 1113 is used to fix the base rod 1111 and the extension rod 1112, so that the base rod 1111 and the extension rod 1112 form a telescopic structure, making the length of the fixing frame 111 adjustable, thereby adapting to the film surface inspection requirements of different specifications or installation positions, and ultimately increasing the versatility and applicability of the device. For example, when the film surface tension inspection device 1 is used in conjunction with a transfer device for film surface inspection, in order to improve transfer efficiency, the transfer device is provided with multiple rolls of film to be tested 3, and different film to be tested 3 are set at different positions (e.g., height). If the height of the film to be tested 3 on the transfer device differs greatly from the height of the guide roller 12 it needs to pass through, it will also affect the accuracy of the film surface tension inspection. The telescopic design of the fixing frame 111 in this application can solve this problem.

[0036] Please see Figure 2 In some embodiments, the base rod 1111 is provided with multiple first mounting holes 1114, which are sequentially arranged along the axial direction X of the base rod 1111. The extension rod 1112 is provided with second mounting holes 1115. The first mounting holes 1114 penetrate the base rod 1111, and the second mounting holes 1115 penetrate the extension rod 1112. The fixing member 1113 passes through the first mounting holes 1114 and the second mounting holes 1115 in sequence to fix the base rod 1111 and the extension rod 1112. By moving the extension rod 1112 so that the second mounting holes 1115 correspond to the first mounting holes 1114 at different positions, the length of the fixing frame 111 can be adjusted, that is, the height of the guide roller 12 on the fixing frame 111 can be adjusted (generally, the fixing frame 111 is placed vertically). The spacing between the multiple first mounting holes 1114 can be designed according to the usage requirements. For example, the spacing between the first mounting holes 1114 can be 50mm, and the height adjustment range of the fixing bracket 111 is 700mm-1300mm. The fixing member 1113 may include bolts or pins.

[0037] In other embodiments, the base rod 1111 is provided with at least one first mounting hole 1114, and the extension rod 1112 is provided with at least one second mounting hole 1115. Each second mounting hole 1115 is provided with a fastener 1113 formed by an elastic buckle. When the extension rod 1112 moves along the axial direction X of the base rod 1111, the elastic buckle is compressed into the second mounting hole 1115 when it contacts the inner wall of the base rod 1111 (i.e., the position where the first mounting hole 1114 is not provided). When the elastic buckle moves to the position of the first mounting hole 1114, it pops out to achieve locking and fixing.

[0038] In other embodiments, the base rod 1111 can also be threadedly connected to the extension rod 1112. The base rod 1111 and the extension rod 1112 are provided with a fixing member 1113 formed by a nut. After the extension rod 1112 is moved into place, it is fixed by tightening the nut.

[0039] It should be noted that the above description of the telescopic structure of the fixing frame 111 in this application is provided through several embodiments in order to facilitate a clear understanding of the telescopic structure of the fixing frame 111 in this application. However, it should not be construed as a limitation on the telescopic structure of the fixing frame 111 in this application. Other alternative and modified telescopic structures should also be included within the scope of this application, such as sliding rod telescopic structures, folding telescopic structures, etc.

[0040] Please see Figure 1 and Figure 3 In some embodiments, the bottom of the fixing frame 111 is provided with a base 14, and the bottom of the base 14 is provided with casters 15. The projection of the fixing frame 111 on the base 14 coincides with the center line of the base 14. The casters 15 provided on the base 14 allow the membrane tension inspection device 1 to be moved and its position adjusted at will, enabling it to be combined with different devices on the production line. This improves the flexibility of the membrane tension inspection device 1 and reduces the overall equipment investment cost on the production line. The design that the projection of the fixing frame 111 coincides with the center line of the base 14 ensures the stability of the device's center of gravity, making it less likely to tip over during movement, thereby improving the safety of use. There are four casters 15, which are evenly distributed on the base 14. Two of the casters 15 can be omnidirectional wheels, and the other two are directional wheels. Omnidirectional wheels and directional wheels are conventional technologies in the art and will not be described in detail here.

[0041] In some embodiments, the base 14 and the guide bracket 11 are both supported by stainless steel pipes, which can improve the strength of the entire membrane tension testing device 1. Moreover, this material is readily available, which helps to reduce the cost of the membrane tension testing device 1. Of course, the base 14 and the guide bracket 11 can also be made of other metal materials (such as iron).

[0042] Embodiments of this application also provide a film tension inspection system, including a film tension inspection device 1 and an unwinding device 2. The film tension inspection device 1 is the same as the film tension inspection device 1 in any of the above embodiments, and will not be described in detail here. The unwinding device 2 is used to unwind the film 3 to be tested to the film tension inspection device 1. Combining the film tension inspection device 1 and the unwinding device 2 can form a complete inspection system, enabling the film 3 to be tested to be smoothly transported from the unwinding device 2 to the film tension inspection device 1, realizing a continuous process from unwinding to inspection, and improving the consistency and efficiency of inspection.

[0043] In some embodiments, the unwinding device 2 includes an unwinding bracket 21 and a rotating shaft 22. The rotating shaft 22 is rotatably mounted on the unwinding bracket 21 and is arranged parallel to the guide roller 12. The parallel arrangement of the rotating shaft 22 and the guide roller 12 in this application effectively ensures that the film 3 under test remains flat during transport, reducing problems such as film surface misalignment and wrinkles caused by non-parallelism. This provides a good film surface condition for subsequent tension testing, thereby improving the accuracy of the test.

[0044] In some embodiments, an air shaft can be provided on the rotating shaft 22. The air shaft facilitates the clamping and unloading of the film roll, thereby further improving production efficiency. Of course, the rotating shaft 22 can also be directly replaced with an air shaft.

[0045] In other embodiments, the unwinding device 2 includes an unwinding bracket 21 and a mounting shaft, or includes an unwinding bracket 21 and a clamping member. The film roll of the film to be tested 3 is mounted on the mounting shaft or clamped on the clamping member. The film roll can rotate relative to the mounting shaft or the clamping member. During inspection, the operator pulls the free end of the film to be tested 3 to release the film to be tested 3, thereby completing the inspection of the film surface of the film to be tested 3.

[0046] In some embodiments, the membrane tension testing system further includes a protractor and / or a tension measuring device. The protractor is used to measure the angle between the fixed frame 111 and the movable frame 112, and the tension measuring device is used to measure the tension of the elastic element 13, providing intuitive data to facilitate the standardization and quantification of testing conditions. In specific applications, the tension is determined based on the tension of the membrane 3 under test at the start of the measurement. After the tension is solidified, it is converted into the angle between the fixed frame 111 and the movable frame 112. The protractor is used to measure the angle and solidify it, thereby quantifying the testing indicators and facilitating the testing of all subsequent membranes 3 under test under uniform indicators. The protractor and tension measuring device can also be calibrated during the measurement process of the entire batch of membranes 3 under test.

[0047] In some embodiments, the unwinding device 2 includes a field turnover device. The field turnover device is used to temporarily store the film rolls to be tested, which facilitates the turnover and management of the film rolls on the production site. It also makes the unwinding process more orderly, ensures that the film tension inspection system can continuously and stably carry out inspection work, and improves the operational efficiency of the production site.

[0048] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A membrane tension testing device, characterized in that, include: A guide bracket, comprising a fixed frame and a movable frame, wherein the movable frame is arranged at an angle to the fixed frame and is movably connected to the fixed frame to change the size of the angle; A guide roller, which is disposed on the movable frame, is used to guide the membrane to be tested; as well as An elastic element is connected between the fixed frame and the movable frame to balance the tension when the movable frame moves.

2. The membrane tension testing device according to claim 1, characterized in that, The movable frame is provided in two parts, which are mounted on the fixed frame. The guide roller is clamped between the two movable frames.

3. The membrane tension testing device according to claim 1, characterized in that, The elastic element is a spring, one end of which is connected to the fixed frame and the other end is connected to the movable frame. The axis of the spring is perpendicular to the rotation axis of the movable frame.

4. The membrane tension testing device according to claim 1, characterized in that, The fixing frame is a telescopic structure; the fixing frame includes a base rod, an extension rod and a fixing member, the extension rod is inserted into the base rod and can move along the axial direction of the base rod to adjust the length of the fixing frame.

5. The membrane tension testing device according to claim 4, characterized in that, The base rod is provided with a plurality of first mounting holes, which are arranged sequentially along the axial direction of the base rod. The extension rod is provided with a second mounting hole. The fastener passes through the first mounting hole and the second mounting hole in sequence to fix the base rod and the extension rod.

6. The membrane tension testing device according to claim 1, characterized in that, The bottom of the fixing frame is provided with a base, and the bottom of the base is provided with wheels. The projection of the fixing frame on the base coincides with the center line of the base.

7. A membrane tension testing system, characterized in that, The device includes a film tension testing device and an unwinding device as described in any one of claims 1-6, wherein the unwinding device is used to unwind the film to be tested to the film tension testing device.

8. The membrane tension testing system according to claim 7, characterized in that, The unwinding device includes an unwinding bracket and a rotating shaft, the rotating shaft being rotatably mounted on the unwinding bracket and arranged parallel to the guide roller.

9. The membrane tension testing system according to claim 7, characterized in that, The membrane tension testing system also includes a protractor and / or a tension measuring device.

10. The membrane tension testing system according to any one of claims 7-9, characterized in that, The unwinding device includes an on-site turnover device.

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