Device and method for evaluating interface bonding capability of optical fiber coating layer

Abstract

The invention discloses a device and a method for evaluating the interface bonding capability of an optical fiber coating layer. The device comprises a sample fixing clamp module, a tensile machine and a control and processing module, the sample fixing clamp module comprises a lower clamp and an upper clamp; the lower clamp is used for fixing an epoxy resin plate or a glass plate substrate through a groove; a spindle is allowed to pass through a central hole of an upper plate; the tail end of the upper clamp is of a symmetrical L-shaped structure and is used for clamping a spindle and applying vertical stripping force. The fixed end of the tensile machine is connected with the lower clamp, and the movable end is connected with the upper clamp and integrated with a mechanical sensor to monitor stripping force in real time. The control and processing module comprises a mechanical control system and a processing unit, the mechanical control system controls the loading speed to ensure that the interface is slowly stripped, and the processing unit receives data of the sensor, calculates adhesive performance parameters in combination with the stripping area, and outputs a mechanical curve and a quantitative result. The adhesive property of the coating layer and the optical fiber core or sheath / epoxy resin interface in the optical fiber composite insulator is quantitatively analyzed, and a reliable evaluation means is provided for production optimization and operation safety of the optical fiber composite insulator.

Description

Technical Field

[0001] The present invention relates to the performance detection technology of composite insulators, and particularly to an apparatus and method for evaluating the interfacial bonding ability of an optical fiber coating layer. Background Art

[0002] With the continuous development and application of UHV DC transmission technology, the measuring devices of various converter stations have put forward higher requirements for the sampling rate and speed. Optical current sensors have received extensive attention and development due to their advantages such as transmission speed, transmission signal accuracy, and excellent electromagnetic interference resistance. As a key component of an optical current sensor, the optical fiber part in a fiber composite insulator plays a role in signal transmission, while the shed and core parts of the composite insulator play roles in anti-pollution, protecting the optical fiber, electrical insulation, and bearing mechanical loads. It combines the communication characteristics of the optical fiber and the insulation performance of the insulator, can meet the requirements of the smart grid for real-time monitoring and communication, and is an important part of the intelligent development of the power system.

[0003] There are various media including optical fibers, coating layers, optical fiber sheaths, epoxy resins, etc. inside the fiber composite insulator, so it is a multi-interface structure. The multi-interface structure is prone to interface defects under the influence of the environmental electric field during long-term operation. Under the action of high field strength, accidents such as internal insulation breakdown may occur at interfaces such as the optical fiber coating layer and epoxy resin, threatening the safe and stable operation of the power grid. Since the bonding performance of the interface is particularly important for the stable operation of the fiber composite insulator, there is an urgent need for a method to evaluate the interfacial bonding ability of the fiber composite insulator.

[0004] The existing methods for evaluating the interface of fiber composite insulators mainly include dye penetration test, water diffusion test, and microsphere debonding test. The dye penetration test mainly evaluates the interface performance by whether the ethanol solution of 1% magenta dye can ensure no penetration within 15 minutes. The water diffusion test is to test the leakage current situation after the boiling water test to evaluate its interface electrical performance. The microsphere debonding test is to use a fixture to scrape off resin microspheres and measure the load during scraping to obtain the optical fiber interface strength. Although the above methods can evaluate the electrical aspects and interface strength of a single interface, they cannot accurately evaluate the bonding performance of multiple interfaces such as the optical fiber coating layer - optical fiber core and the optical fiber coating layer - sheath / epoxy resin.

[0005] It should be noted that the information disclosed in the above background art section is only for understanding the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0006] The main purpose of the present invention is to overcome the defects existing in the above background art, and provide an apparatus and method for evaluating the interfacial bonding ability of an optical fiber coating layer.

[0007] To achieve the above object, the present invention adopts the following technical solutions: An optical fiber coating interface bonding ability evaluation device, comprising: The sample fixing fixture module is used to fix the test sample and transmit the peeling force, which includes: A lower fixture, configured to fix the coating layer substrate and connected to the fixed end of the tensile machine, comprises a lower plate and an upper plate, wherein the lower plate is provided with a groove to be embedded in the epoxy resin plate or the glass plate, and the upper plate is provided with a central hole to allow the spindle to pass through and is fixed to the lower plate; The upper fixture is configured to clamp the spindle and is linked to the moving end of the tensile machine, and its end is a symmetrical L-shaped clamping structure for clamping the spindle and applying a peeling force vertically to the coating layer interface; A tensile machine, comprising a fixed end and a movable end, wherein the fixed end is connected to a lower fixture to keep the substrate stable, the movable end is connected to an upper fixture to drive the peeling force loading, and a mechanical sensor is provided at the connection between the movable end and the upper fixture; Control and processing module, including: A mechanical control system configured to control the loading speed of the mobile end to ensure that the peeling force is applied slowly; The processing unit is configured to receive real-time mechanical data from the mechanical sensor, calculate the bonding performance parameters in combination with the peeling area, and output the mechanical curve and quantitative evaluation results.

[0008] Furthermore, the test sample includes a substrate with a coating layer coated on an epoxy resin plate or a glass plate, the coating layer is fixed to the spindle by a strong adhesive after UV curing, and the coating layer under the spindle is separated from the surrounding coating layer to form an interface area to be tested.

[0009] Furthermore, the groove of the lower plate is a square groove to adapt to the embedding of the epoxy resin plate or the glass plate, the center hole of the upper plate is a center circular hole, the diameter of which is larger than the diameter of the spindle, and the upper plate and the lower plate are fixedly connected by screw holes and nuts around them.

[0010] Furthermore, the tensile testing machine is a universal tensile testing machine, the fixed end is connected to the lower clamp to keep the substrate position stable, the movable end is linked to the upper clamp to apply vertical peeling force, and the peeling force data is transmitted to the control and processing module in real time through the mechanical sensor.

[0011] Furthermore, the device is adapted to optical fiber composite insulators with different sheath materials, including polytetrafluoroethylene, polyimide or polyimide sheath structures, and the bonding performance of the coating-sheath / epoxy resin interface or the coating-optical fiber core interface is tested by replacing the epoxy resin plate or glass plate substrate.

[0012] Furthermore, the L-shaped clamping end of the upper fixture is provided with symmetric grooves to fix the spindle, ensuring that the peeling force acts vertically on the coating interface, and the interface separation position after peeling is the interface between the coating and the optical fiber / sheath / epoxy resin, rather than the interface between the spindle and the adhesive.

[0013] A method for evaluating the bonding ability of an optical fiber coating interface, using the optical fiber coating interface bonding ability evaluation device as described above, the method comprising the following steps: S1. Prepare a test sample: Coat the coating on a substrate, fix the spindle with a strong adhesive after ultraviolet curing, and separate the coating below the spindle to form an interface to be tested; S2. Assemble the test device: Fix the sample in the lower fixture, and connect the upper and lower fixtures to the fixed end and the mobile end of the tensile machine respectively; S3. Configure the control and processing module: Initialize the mechanical sensor and calibrate it, control the upper fixture to clamp the spindle and apply a vertical peeling force; S4. Interface peeling test: Apply a peeling force through the tensile machine until the coating is separated from the target interface, and record the peeling force F and the peeling area S1; S5. Bonding performance calculation: Calculate the bonding performance parameter M according to the formula M = F / S1, and take the average value of multiple tests on the same sample as the final result.

[0014] Furthermore, in step S1, the substrate is an epoxy resin board or a glass board, which are respectively used to test the bonding performance of the coating with the sheath / epoxy resin interface or the coating with the optical fiber core interface.

[0015] Furthermore, in step S4, the peeling force application speed is controlled by the control and processing module to be slowly loaded, ensuring that the interface separation occurs between the coating and the target interface, rather than the interface between the spindle and the adhesive.

[0016] Furthermore, in step S5, the multiple tests are to conduct peeling tests on three fan-shaped umbrella skirt areas of the same test sample, and calculate the average value of the three tests as the final bonding performance parameter.

[0017] The present invention has the following beneficial effects: The present invention provides an apparatus and method for evaluating the interfacial bonding ability of an optical fiber coating, which can accurately and quantitatively evaluate the bonding ability of the interface between the optical fiber coating and the optical fiber core, and the interface between the optical fiber coating and the sheath / epoxy resin of an optical fiber composite insulator, obtain an intuitive situation of the interfacial bonding ability, and further evaluate its overall performance. Compared with the existing methods, the apparatus and method of the present invention can more specifically detect and evaluate the bonding ability of the interface region, the apparatus is simple, the operation is easy, and quantitative analysis can be provided. The apparatus and method of the present invention can effectively provide a reference for the optimization of the coating formulation, the production and operation of optical fiber composite insulators, and provide guidance for the safe operation of the power grid.

[0018] Other beneficial effects in the embodiments of the present invention will be further described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of an apparatus for evaluating the interfacial bonding performance of an optical fiber coating according to an embodiment of the present invention.

[0020] Figure 2 is a schematic diagram of a test sample according to an embodiment of the present invention.

[0021] Figure 3 is a schematic diagram of a lower fixture according to an embodiment of the present invention.

[0022] Figure 4 is a schematic diagram of an upper fixture according to an embodiment of the present invention.

[0023] Figure 5 is a flowchart of a method for evaluating the interfacial bonding performance of a coating according to an embodiment of the present invention.

[0024] REFERENCE SIGNS: 1: Industrial control computer; 2: Mechanical control system; 3: Tensile testing machine; 4: Test sample; 5: Upper fixture; 6: Lower fixture. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following provides a detailed description of the embodiments of the present invention. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present invention and its applications.

[0026] 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. In addition, the connection can be for a fixing function or for a coupling or communication function.

[0027] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0029] Currently, the evaluation of the interface performance of fiber optic composite insulators mainly refers to the interface detection method of composite insulators, and there is no accurate method to evaluate the performance of the interface between the internal fiber coating - fiber core and the fiber coating - sheath / epoxy resin. The present invention proposes an evaluation device and method for the bonding ability of the fiber coating interface, which can accurately and quantitatively evaluate the bonding ability of the interface between the fiber coating - fiber core interface and the fiber coating - sheath / epoxy resin interface of the fiber optic composite insulator, obtain an intuitive situation of the interface bonding ability, and further evaluate its overall performance.

[0030] Refer to Figures 1 to 4, an embodiment of the present invention provides an optical fiber coating interface bonding ability evaluation device, including a sample fixing fixture module, a tensile machine 3 and a control and processing module: the sample fixing fixture module is used to fix the test sample 4 and transmit the peeling force, which includes: a lower fixture 6, configured to fix the coating substrate and connected to the fixed end of the tensile machine 3, including a lower plate 62 and an upper plate 61, the lower plate 62 is provided with a groove to embed the epoxy resin plate or glass plate, the upper plate 61 is provided with a center hole to allow the spindle to pass through, and is fixed to the lower plate 62; an upper fixture 5, configured to clamp the spindle and link with the moving end of the tensile machine 3, and its end is a symmetrical L-shaped clamping structure, which is used to clamp the spindle and vertically apply the peeling force to the coating interface. The tensile machine 3 includes a fixed end and a moving end, the fixed end is connected to the lower fixture 6 to keep the substrate stable, the moving end is connected to the upper fixture 5 to drive the peeling force loading, and a mechanical sensor is provided at the connection between the moving end and the upper fixture 5. The control and processing module includes: a mechanical control system 2, which is configured to control the loading speed of the mobile terminal to ensure that the peeling force is applied slowly; a processing unit (such as an industrial computer 1), which is configured to receive real-time mechanical data from the mechanical sensor, calculate the bonding performance parameters in combination with the peeling area, and output the mechanical curve and quantitative evaluation results. The device is designed with a special fixture based on the tensile machine 3, wherein the L-shaped clamping structure of the upper fixture 5 cooperates with the center hole of the lower fixture 6 to ensure that the peeling force acts accurately between the coating layer and the target interface. The control and processing module is connected to the signal of the tensile machine 3 to realize the synchronous collection and processing of mechanical data and accurately evaluate the coating layer interface bonding performance.

[0031] In some embodiments, the test sample 4 includes a substrate with a coating layer coated on an epoxy resin plate or a glass plate, the coating layer is fixed to the spindle by a strong adhesive after UV curing, and the coating layer under the spindle is separated from the surrounding coating layer to form an interface area to be tested.

[0032] In some embodiments, the groove of the lower plate 62 is a square groove, which is adapted for embedding of an epoxy resin plate or a glass plate. The center hole of the upper plate 61 is a center circular hole, whose diameter is larger than the spindle diameter, and the upper plate 61 and the lower plate 62 are fixedly connected by screw holes and nuts around them.

[0033] In some embodiments, the tensile testing machine 3 is a universal tensile testing machine, the fixed end is connected to the lower clamp 6 to keep the substrate position stable, the movable end is linked to the upper clamp 5 to apply vertical peeling force, and the peeling force data is transmitted to the control and processing module in real time through the mechanical sensor.

[0034] In some embodiments, the device adapts to optical fiber composite insulators with different sheath materials, including polytetrafluoroethylene, thermoplastic polyurethane or polyimide sheath structures, and the bonding performance of the coating-sheath / epoxy resin interface or the coating-optical fiber core interface is tested by replacing the epoxy resin board or glass board substrate.

[0035] In some embodiments, the L-shaped clamping end of the upper clamp 5 is provided with symmetric grooves to fix the spindle, ensuring that the peeling force acts vertically on the coating interface, and the interface separation position after peeling is the coating and the optical fiber / sheath / epoxy resin interface, rather than the spindle and the adhesive interface.

[0036] A method for evaluating the bonding ability of an optical fiber coating interface, using the device for evaluating the bonding ability of an optical fiber coating interface, the method comprising the following steps: S1. Prepare a test sample 4: Coat the coating on a substrate, fix the spindle with a strong adhesive after ultraviolet curing, and separate the coating below the spindle to form an interface to be tested; S2. Assemble the test device: Fix the sample in the lower clamp 6, and connect the upper and lower clamps 6 to the fixed end and the mobile end of the tensile machine 3 respectively; S3. Configure the control and processing module: Initialize the mechanical sensor and calibrate it, control the upper clamp 5 to hold the spindle and apply a vertical peeling force; S4. Interface peeling test: Apply a peeling force through the tensile machine 3 until the coating is separated from the target interface, and record the peeling force F and the peeling area S1; S5. Bonding performance calculation: Calculate the bonding performance parameter M according to the formula M = F / S1, and take the average value of multiple tests on the same sample as the final result.

[0037] Further, in step S1, the substrate is an epoxy resin board or a glass board, which is used to test the bonding performance of the coating and the sheath / epoxy resin interface or the coating and the optical fiber core interface respectively.

[0038] Further, in step S4, the peeling force application speed is controlled by the control and processing module to be slowly loaded, ensuring that the interface separation occurs between the coating and the target interface, rather than the spindle and the adhesive interface.

[0039] Further, in step S5, the multiple tests are to select three fan-shaped umbrella skirt areas on the same test sample 4 for peeling tests, and calculate the average value of the three tests as the final bonding performance parameter.

[0040] The optical fiber coating interface bonding ability evaluation device and method proposed by the present invention can quantitatively evaluate the unique optical fiber coating - optical fiber core and optical fiber coating - sheath / epoxy resin interfaces inside the fiber composite insulator through this device and method, obtain the intuitive situation of the interface bonding ability, and then evaluate its overall performance. This device and method can effectively provide references for the optimization of the coating formula, the production and operation of fiber composite insulators, and provide guidance for the safe operation of the power grid.

[0041] The following further describes specific embodiments of the present invention.

[0042] An optical fiber composite insulator coating interface bonding ability evaluation device, the structural schematic diagram of which is as Figure 1 shown. This device includes a sample fixing fixture module, a universal testing machine, and a control and processing module.

[0043] Before evaluating the interface bonding performance of the protective coating, first coat the test coating on the pre-prepared epoxy resin plate and glass plate. Currently, the commonly used coatings are all photocurable coatings, so ultraviolet curing is carried out after coating. After curing, use a strong adhesive to paste the spindle on the surface of the coating to prepare a test piece as Figure 2 shown, and record the area of the spindle as S at the same time.

[0044] The sample fixing fixture module is divided into an upper fixture and a lower fixture. Among them, the lower fixture is used to fix the epoxy resin plate or glass plate after the coating is applied, and the structure is as Figure 3 shown. The lower fixture is composed of an upper plate and a lower plate. The lower plate is as shown in (a) of Figure 3 , which has a square groove on the upper bottom surface and the lower bottom surface can be connected to the universal testing machine. The center of the upper plate is a square plate with a circular hole as shown in (b) of Figure 3 . The diameter of the circular hole is slightly larger than the diameter of the spindle to ensure that the spindle can pass through the circular hole. There are screw holes around the upper plate and the lower plate, and they can be fixed by nuts. The upper fixture is as shown in Figure 4 , and the lower end of the fixture is in the shape of a symmetric "L", which can fix the spindle in the groove. The other end of the upper fixture can also cooperate with the universal testing machine.

[0045] The universal testing machine mainly has two functions. One function is to fix the lower fixture on the testing machine to ensure that its position will not change during use. The other function is to cooperate with the upper fixture to apply force to the upper spindle, peel off the coating - optical fiber / sheath / epoxy resin interface connected to the spindle by applying force to the upper fixture, and can connect to the control and processing module to measure the magnitude of the applied force at this time.

[0046] The control and processing module includes a mechanical control system and an industrial control computer as the processing unit. The mechanical control system can connect to mechanical sensors to detect the real-time mechanical value during the test and output it to the industrial control computer. The industrial control computer can control the position movement of the upper fixture and output a mechanical curve graph. The peeling force obtained from the test is F.

[0047] The steps of the method for evaluating the interfacial bonding ability of the optical fiber coating layer are as follows: Step 1: Preparation of test samples. Coat the test coating layer on the pre-prepared epoxy resin plate and glass plate. After coating, perform ultraviolet curing. After curing, use a strong adhesive to paste the spindle on the surface of the coating layer. At the same time, use a circular cutter to separate the coating layer at the position below the spindle from the coating layers at other positions.

[0048] Step 2: Assembly of the test device. First, fix the prepared sample on the lower fixture. Then, fix both the upper and lower fixtures of the sample fixture fixing module to the universal tensile testing machine. Tighten the screws of the lower fixture to ensure that the sample is stably fixed to the lower fixture.

[0049] Step 3: Configuration of the control and processing module. Control the upper fixture to move above the sample vertically to clamp the spindle. Turn on the industrial control computer, initialize the mechanical value detected by the mechanical sensor to 0, and view the mechanical value and the curve graph in real time on the display.

[0050] Step 4: Testing of the optical fiber coating layer. Conduct experiments according to the assembled and configured device. Apply a mechanical action through the upper fixture until the interface between the coating layer connected to the spindle and the optical fiber / sheath / epoxy resin is separated. After the test, observe whether the separated interface is the separation of the interface between the coating layer and the optical fiber / sheath / epoxy resin, rather than the direct separation of the interface between the spindle and the strong adhesive. Record the force at this time of interface separation as F.

[0051] Step 5: Calculation of the interfacial bonding performance of the optical fiber coating layer. Calculate the area size of the peeled coating layer after peeling and record it as S1. Calculate the evaluation parameter of the interfacial bonding performance of the coating layer at this time according to the read mechanical value and the area measurement value using the following formula:

[0052] Calculate the average value of the interfacial parameters of the three sector umbrella skirts on the same sample as the final bonding performance parameter.

[0053] This method for evaluating the interfacial bonding ability of the coating layer of the fiber composite insulator is based on Figure 5Operate according to the shown process. Before using the test device, it is necessary to calibrate the mechanical sensor at the sample fixing device and the signal acquisition system at the control and processing module to ensure the accuracy of the measurement of the two mechanical values. Only after the calibration is completed can the subsequent bonding performance test be carried out. When testing the bonding performance parameters of the coating interface, when the control and processing module applies force, the force increase speed should be as small as possible to ensure that the peeling position occurs at the coating and the underlying plate.

[0054] The present invention can accurately test the interface bonding performance between the coating and different interfaces. For different types of fiber composite insulators, their sheath structures are different. Currently, commonly used structural sheaths include polytetrafluoroethylene, thermoplastic polyurethane, polyimide, etc. The present invention can test the bonding performance for different sheath structures and has a wide range of applications. The present invention can not only test the bonding performance between the coating and different sheath structures, but also test the bonding performance between the coating and the optical fiber. Just replace the sample plate of the epoxy resin plate or sheath material with a glass plate. The present invention designs the bonding performance parameters of the coating, and determines the bonding performance value according to the interface peeling pressure value and the peeling area, realizing the quantification of the bonding performance. When testing the bonding performance, 3 experiments are carried out to avoid errors caused by accidental situations and make the experiment more accurate.

[0055] In summary, the present invention proposes an apparatus and method for evaluating the interface bonding ability of an optical fiber coating, which can accurately and quantitatively evaluate the bonding ability of the optical fiber coating - optical fiber core interface and the optical fiber coating - sheath / epoxy resin interface of a fiber composite insulator, obtain an intuitive situation of the interface bonding ability, and then evaluate its overall performance. Compared with the existing methods, the apparatus and method of the present invention can more specifically detect and evaluate the bonding ability of the interface region, the apparatus is simple, the operation is easy, and quantitative analysis can be provided. The apparatus and method of the present invention can effectively provide a reference for the optimization of the coating formula, the production and operation of fiber composite insulators, and provide guidance for the safe operation of the power grid.

[0056] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, they can make several substitutions or modifications to these described embodiments, and these substitution or modification methods should all be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of protection of the patent application.

Claims

1. An evaluation device for the interfacial bonding ability of an optical fiber coating layer, characterized in that include: The sample fixing fixture module is used to fix the test sample and transmit the peeling force, which includes: A lower fixture, configured to fix the coating layer substrate and connected to the fixed end of the tensile machine, comprises a lower plate and an upper plate, wherein the lower plate is provided with a groove to be embedded in the epoxy resin plate or the glass plate, and the upper plate is provided with a central hole to allow the spindle to pass through and is fixed to the lower plate; The upper fixture is configured to clamp the spindle and is linked to the moving end of the tensile machine, and its end is a symmetrical L-shaped clamping structure for clamping the spindle and applying a peeling force vertically to the coating layer interface; A tensile machine, comprising a fixed end and a movable end, wherein the fixed end is connected to a lower fixture to keep the substrate stable, the movable end is connected to an upper fixture to drive the peeling force loading, and a mechanical sensor is provided at the connection between the movable end and the upper fixture; Control and processing module, including: A mechanical control system configured to control the loading speed of the mobile end to ensure that the peeling force is applied slowly; The processing unit is configured to receive real-time mechanical data from the mechanical sensor, calculate the bonding performance parameters in combination with the peeling area, and output the mechanical curve and quantitative evaluation results.

2. The device according to claim 1, wherein The test sample includes a substrate with a coating layer coated on an epoxy resin plate or a glass plate, the coating layer is fixed to the spindle by a strong adhesive after UV curing, and the coating layer below the spindle is separated from the surrounding coating layer to form an interface area to be tested.

3. The device according to claim 1 or 2, characterized in that, The groove of the lower plate is a square groove to adapt to the embedding of the epoxy resin plate or the glass plate, the central hole of the upper plate is a central circular hole, the diameter of which is larger than the diameter of the spindle, and the upper plate and the lower plate are fixedly connected by screw holes and nuts around them.

4. The device according to claim 1 or 2, characterized in that, The tensile testing machine is a universal tensile testing machine. The fixed end is connected to the lower clamp to keep the substrate position stable. The movable end is linked to the upper clamp to apply vertical peeling force, and the peeling force data is transmitted to the control and processing module in real time through the mechanical sensor.

5. The device according to claim 1 or 2, characterized in that The device is adapted to optical fiber composite insulators with different sheath materials, including polytetrafluoroethylene, hyaluronic acid or polyimide sheath structures, and the bonding performance of the coating-sheath / epoxy resin interface or the coating-optical fiber core interface is tested by replacing the epoxy resin plate or the glass plate substrate.

6. The device according to claim 1 or 2, characterized in that, The L-shaped clamping end of the upper clamp is provided with symmetrical grooves to fix the spindle, ensuring that the stripping force acts perpendicularly on the coating interface, and the interface separation position after stripping is the coating and optical fiber / sheath / epoxy resin interface, rather than the spindle and adhesive interface.

7. A method for evaluating the interfacial adhesion ability of an optical fiber coating layer, characterized in that, Using the optical fiber coating interface bonding ability evaluation device according to any one of claims 1 to 6, the method comprises the following steps: S1. Prepare the test sample: apply the coating layer on the substrate, fix the ingot with a strong adhesive after UV curing, and separate the coating layer under the ingot to form an interface to be tested; S2. Assemble the test device: fix the sample in the lower fixture, and connect the upper and lower fixtures to the fixed end and the movable end of the tensile machine respectively; S3, configuration control and processing module: initialize and calibrate the mechanical sensor, control the upper fixture to clamp the spindle and apply vertical peeling force; S4, interface peeling test: apply peeling force through a tensile testing machine until the coating layer is separated from the target interface, and record the peeling force F and peeling area S1; S5. Adhesion performance calculation: Calculate the adhesion performance parameter M according to the formula M = F / S1, and take the average value of multiple tests on the same sample as the final result.

8. The method according to claim 7, characterized in that In step S1, the substrate is an epoxy resin board or a glass board, which are respectively used to test the adhesion performance of the coating layer to the sheath / epoxy resin interface or the coating layer to the optical fiber core interface.

9. The method according to claim 7 or 8, characterized in that, In step S4, the peeling force application speed is controlled by the control and processing module to be slowly loaded, ensuring that the interface separation occurs between the coating layer and the target interface, rather than between the spindle and the adhesive interface.

10. The method according to claim 7 or 8, characterized in that In step S5, the multiple tests are to select three sector-shaped umbrella skirt areas on the same test sample for peeling tests, and calculate the average value of the three tests as the final adhesion performance parameter.

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