A device for testing the adhesive strength of honeycomb panels

Abstract

This invention relates to the field of materials testing technology, specifically to a device for testing the adhesive strength of a honeycomb panel, comprising a peeling assembly and a synchronization assembly. The peeling assembly includes a first clamping unit and a second clamping unit for clamping both ends of the panel, with the second clamping unit having a peeling path with gradually increasing curvature. In the initial stage of peeling loading, the panel gradually bends and peels along the peeling path; due to its extremely small initial curvature, the required bending deformation of the panel is small, and the initial peeling torque is extremely low. The input energy of the driving assembly is mainly used to overcome the initial static friction force at the adhesive interface and the gradual bonding deformation of the panel, avoiding abrupt accumulation of elastic potential energy. This allows the peeling force curve to smoothly climb from zero, capturing the critical load for initial cracking of the adhesive layer and providing key mechanical indicators for assessing the early failure risk of the adhesive structure. The synchronization assembly ensures that the core material maintains a preset vertical orientation throughout the peeling process, avoiding peeling angle deviations and additional stress caused by core material tilting.

Description

Technical Field

[0001] This invention relates to the field of materials testing technology, and in particular to a device for testing the adhesive strength of honeycomb panels. Background Technology

[0002] The honeycomb panel roller peel tester is a specialized mechanical device used to test the bonding strength between the panel and the core material of a honeycomb sandwich structure. It is mainly applicable to composite materials such as aluminum honeycomb panels, and tests the peel strength and peel torque to provide data support for material quality control, process optimization and product acceptance.

[0003] The honeycomb panel roller peel tester includes a frame, roller clamps, sensors, a drive system, and a data acquisition system. During testing, one end of a standard sample is fixed to the frame, and the peeled panel wraps around the roller. The drive system pulls the roller at a constant speed, utilizing the roller's constant curvature to create a stable bending radius, simulating actual stress conditions and enabling smooth and uniform peeling of the panel from the core material. The data acquisition system collects the peel force values ​​detected by the sensors in real time. By calculating the average peel torque per unit width of the sample, it accurately assesses the bonding strength and interlayer bonding reliability between the honeycomb panel and the core material. The equipment can automatically collect data, plot force curves, and complete result calculations. The testing process is stable and controllable, meeting the requirements of multiple relevant national testing standards.

[0004] However, in the initial stage of a traditional honeycomb panel roller peel tester, the panel is instantly bent from a flat state by the roller, resulting in a significant stress abrupt change and an extremely high initial load peak. This peak is mostly caused by the combined effects of system impact, instantaneous bending deformation, and clamping stress, and is not the load of actual bonding and cracking between the panel and the core material; it is a test artifact. In conventional data processing, this peak is usually directly discarded, failing to reflect the material's true initial cracking behavior and the crack initiation characteristics of the bonding interface. This not only results in the loss of crucial initial failure data but also leads to deviations between the test results and the actual stress state, making it difficult to accurately assess the bonding quality, early cracking toughness, and structural reliability, thus affecting the objective judgment of material properties and the evaluation of engineering applications. Summary of the Invention

[0005] Therefore, it is necessary to provide a device for testing the adhesive strength of honeycomb panels, which addresses the problem that current honeycomb panel roller peeling testers require the panel to be bent and shaped instantly during the test start-up phase, resulting in extremely high initial load peaks.

[0006] The above objectives are achieved through the following technical solutions: A device for testing the adhesive strength of a honeycomb panel, comprising: A honeycomb panel, the honeycomb panel comprising a face panel and a core material adhered to the face panel.

[0007] frame.

[0008] The peeling assembly includes a first clamping unit and a second clamping unit for clamping the two ends of the panel respectively. The second clamping unit has a peeling path with gradually increasing curvature, during which the panel is gradually bent and peeled along the peeling path.

[0009] A synchronization component is used to keep the core material in a preset orientation during the peeling process.

[0010] A drive assembly for driving the first clamping unit to move relative to the frame to perform a peeling operation.

[0011] Furthermore, the second clamping unit includes a peeling cylinder and a third clamping plate; the peeling cylinder is movably disposed on the frame, and the outer peripheral surface of the peeling cylinder is configured as a guide surface with curvature continuously increasing along the peeling direction, the guide surface forming the peeling path; the third clamping plate is fixedly connected to the peeling cylinder by bolts, and the third clamping plate is used to clamp the lower end of the panel together with the peeling cylinder.

[0012] The peeling cylinder has flanges extending radially outward and coaxially at both ends. The outer peripheral surface contour of the flanges is consistent with the curvature change law of the guide surface. A loading belt is wrapped around the outer peripheral surface of the flanges. One end of the loading belt is fixedly connected to the frame. The loading belt is used to drive the peeling cylinder to rotate when it moves.

[0013] Furthermore, the second clamping unit also includes a fixing frame, which is fixedly connected to the frame. The fixing frame is provided with a guide groove extending in the vertical direction, and both ends of the peeling cylinder are slidably disposed in the guide groove to guide the peeling cylinder to move in the vertical direction.

[0014] Furthermore, the first clamping unit includes a lifting plate, a first clamping plate, and a first fixing plate; the lifting plate is movably mounted on the frame; the upper end of the first clamping plate is connected to the lifting plate; the first fixing plate is fixedly connected to the first clamping plate by bolts, and the first fixing plate is used to clamp the upper end of the panel together with the first clamping plate.

[0015] The drive assembly includes a drive cylinder, which is used to drive the lifting plate to move in the vertical direction.

[0016] Furthermore, the upper end of the first clamping plate is slidably connected to the lifting plate in the horizontal direction; the synchronization component includes a transmission structure, which is used to drive the first clamping plate to slide in the horizontal direction during the peeling process so that the upper end and the lower end of the core material move synchronously.

[0017] Furthermore, the transmission structure includes a mounting frame, a synchronous roller, and a synchronous belt; the mounting frame is disposed on the lifting plate; the synchronous roller is rotatably connected to the mounting frame, the outer peripheral surface contour of the synchronous roller is consistent with the outer peripheral surface contour of the peeling cylinder, and the outer wall of the synchronous roller is in contact with the first fixed plate; the synchronous belt connects the peeling cylinder and the synchronous roller, and is used to make the synchronous roller and the peeling cylinder rotate synchronously during the peeling process.

[0018] Furthermore, a limiting rod is provided on the first fixed plate, and a sliding groove is provided on the synchronous roller to cooperate with the limiting rod. The extended contour of the sliding groove is consistent with the outer peripheral surface contour of the synchronous roller, and the limiting rod is slidably embedded in the sliding groove.

[0019] Furthermore, the synchronization component also includes a tensioning unit for adaptively adjusting the tension of the synchronization belt.

[0020] Furthermore, the tensioning unit includes a movable plate and an elastic element; the movable plate is slidably disposed within the mounting frame in a horizontal direction, and both ends of the movable plate extend out of the mounting frame and are rotatably connected to tensioning wheels; the synchronous belt is simultaneously connected to the peeling cylinder, the synchronous roller, and the tensioning wheels; the elastic element is disposed between the movable plate and the mounting frame, and the elastic force of the elastic element always keeps the movable plate at the middle position between the mounting frame and the first clamping plate.

[0021] Furthermore, a first drive wheel is coaxially fixed at both ends of the stripping cylinder, and a second drive wheel is coaxially fixed at both ends of the synchronous roller. The synchronous belt is wound around the first drive wheel, the second drive wheel, and the tensioning wheel.

[0022] The beneficial effects of this invention are: This invention provides a device for testing the adhesive strength of a honeycomb panel, comprising a peeling assembly and a synchronization assembly. The peeling assembly includes a first clamping unit and a second clamping unit, which are respectively used to clamp the upper and lower ends of the panel. The second clamping unit has a peeling path with curvature gradually increasing along the peeling direction.

[0023] In the initial stage of peel loading, the panel gradually bends and peels along the gradually curvature path. Due to the extremely small initial curvature of the peel path, the panel only undergoes slight bending deformation in the initial stage, and the required bending and peeling torques are both at extremely low levels. Most of the energy input to the drive component is used to overcome the initial static friction of the adhesive interface and to slowly conform the panel to the peel path surface, rather than forcibly bending the panel instantaneously. This effectively avoids the sudden accumulation of elastic potential energy and stress mutation, eliminating the initial load peak that is easily observed in traditional testing devices. This structure makes the peel force curve appear to be smooth and continuously rising from zero, which can accurately capture the critical load for initial cracking of the adhesive layer and the crack initiation toughness. It provides key and reliable fracture mechanics indicators for evaluating the initial defect tolerance of the adhesive interface, the resistance to microcrack propagation, and the early failure risk of the adhesive structure.

[0024] The synchronous component compensates for the horizontal displacement of the core material end in real time during the peeling process, ensuring that the core material remains in a stable preset vertical position throughout the peeling process. This avoids peeling angle deviation and additional stress caused by core material tilting and swaying, ensuring uniform panel bending, constant peeling trajectory, and accurate load acquisition, thus significantly improving the accuracy, stability, and repeatability of adhesive strength testing. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a honeycomb panel adhesive strength testing device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the peeling component in a honeycomb panel adhesive strength testing device provided in an embodiment of the present invention; Figure 3 for Figure 2 Exploded view of the structure shown; Figure 4 for Figure 3 Side view of the structure shown; Figure 5 for Figure 4 A cross-sectional view along the AA direction; Figure 6 This is a schematic diagram of the structure of the first clamping unit and the synchronization component in a honeycomb panel adhesive strength testing device provided in an embodiment of the present invention; Figure 7 for Figure 6 Exploded view of the structure shown; Figure 8 for Figure 7 A schematic diagram of the synchronous roller and the first fixed plate in the structure shown; Figure 9 This is a schematic diagram of the structure of the honeycomb panel and the peeling cylinder in a honeycomb panel adhesive strength testing device provided in an embodiment of the present invention.

[0026] in: 110. Panel; 120. Core material; 210. Rack; 310. Lifting plate; 320. First clamping plate; 321. Sliding block; 330. First fixing plate; 331. Limiting rod; 340. Mounting bracket; 350. Synchronous roller; 351. Sliding groove; 352. Second transmission wheel; 360. Synchronous belt; 370. Moving plate; 371. Tensioning wheel; 380. Compression spring; 410. Fixing frame; 411. Upright plate; 412. Guide groove; 413. Second clamping plate; 414. Second fixing plate; 420. Peeling cylinder; 421. Flange; 422. Loading belt; 423. First transmission wheel; 430. Third clamping plate. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] The following reference Figures 1 to 9 The present invention describes a device for testing the adhesive strength of a honeycomb panel, comprising a frame 210, a peeling assembly, and a drive assembly.

[0031] Specifically, the honeycomb panel includes a panel 110 and a core material 120 adhered to the panel 110. The panel 110 is the structure to be peeled off, and the core material 120 is the load-bearing support structure.

[0032] The frame 210 is a frame structure. The frame 210 is fixedly installed on the ground or other fixed support surface. The frame 210 is used to provide a stable mounting base for other components.

[0033] The stripping assembly includes a first clamping unit and a second clamping unit.

[0034] The first clamping unit includes a lifting plate 310, a first clamping plate 320, and a first fixing plate 330.

[0035] The lifting plate 310 extends horizontally and is movably connected to the frame 210. The lifting plate 310 can move vertically along the frame 210. The first clamping plate 320 extends vertically, and its upper end is connected to the lifting plate 310. The first fixing plate 330 is bolted to the first clamping plate 320. The first clamping plate 320 and the first fixing plate 330 are used to stably clamp the upper end of the panel 110, ensuring that the upper end of the panel 110 does not slip relative to the other end during the peeling process.

[0036] The second clamping unit includes a fixing frame 410, a peeling cylinder 420, and a third clamping plate 430.

[0037] The mounting bracket 410 is a flat plate structure and is fixedly connected to the worktable surface of the machine frame 210. Two upright plates 411 are fixedly installed on the upper surface of the mounting bracket 410, and the two upright plates 411 extend upward in the vertical direction.

[0038] The peeling cylinder 420 is a cylindrical rotating structure. Extension rods are fixedly extended outwards from both ends of the peeling cylinder 420 along its own axis. Each upright plate 411 is provided with a guide groove 412 penetrating both ends of the upright plate 411. Each extension rod is embedded inside the guide groove 412 of an upright plate 411, and the extension rod and guide groove 412 are in sliding engagement to ensure that the peeling cylinder 420 can move stably and linearly within the upright plate 411 in the vertical direction. Simultaneously, in the event of unexpected equipment shutdown, sudden load changes, or sudden breakage of the panel 110, the upright plate 411 can directly prevent the peeling cylinder 420 from accidentally falling, avoiding structural damage and safety hazards caused by the peeling cylinder 420 detaching.

[0039] The peeling cylinder 420 has flanges 421 extending radially outward at both ends. The flanges 421 are protruding structures, and their outer contours are coaxial with the outer contours of the peeling cylinder 420. A loading band 422, a rigid strip structure, is wound around the outer circumferential surface of each flange 421. A second clamping plate 413 and a second fixing plate 414 are also fixedly mounted on the fixing frame 410. The second clamping plate 413 is fixedly installed on the upper end face of the fixing frame 410, and the second fixing plate 414 is bolted to the second clamping plate 413. The second clamping plate 413 and the second fixing plate 414 are used to fix one end of the loading band 422. The loading band 422 is tightly wound around the outside of the flanges 421 at both ends of the peeling cylinder 420, and the flanges 421 can axially limit the loading band 422.

[0040] The third clamping plate 430 is fixed to the outer surface of the peeling cylinder 420 by bolts. The third clamping plate 430 and the peeling cylinder 420 are used to stably clamp the lower end of the panel 110. The third clamping plate 430 and the peeling cylinder 420 ensure that the lower end of the panel 110 has no relative displacement with the surface of the peeling cylinder 420 during the peeling process.

[0041] The drive assembly includes a drive cylinder, which is fixedly mounted on the frame 210. The output end of the drive cylinder is fixedly connected to the lifting plate 310. The drive cylinder is used to provide a stable driving force for the lifting plate 310 to move linearly in the vertical direction. The drive cylinder can ensure the constant movement speed of the lifting plate 310 and the accuracy of displacement control.

[0042] The adhesive strength testing device has a clamping and positioning stage and a peeling loading stage during the testing process.

[0043] When the adhesive strength testing device is in the clamping and positioning stage, the lower end of the panel 110 is first locked by the third clamping plate 430 and the peeling cylinder 420. Then, the drive cylinder pushes the lifting plate 310 to move downward, and the lifting plate 310 drives the first clamping plate 320 and the first fixing plate 330 to move downward to the clamping position at the upper end of the panel 110. The first clamping plate 320 and the first fixing plate 330 are locked to the upper end of the panel 110 by bolts.

[0044] After the upper and lower ends of panel 110 are clamped, the adhesive strength testing device enters the peeling loading stage. The drive cylinder outputs a constant vertical upward traction force, causing the lifting plate 310, the first clamping plate 320, the first fixing plate 330, and the upper end of panel 110 to move upward synchronously. While panel 110 moves upward, the loading band 422 of constant length forms a continuous tangential constraint on the outer peripheral surface of flange 421, driving the peeling cylinder 420 to rotate around its own axis, causing the peeling cylinder 420 to roll upward along the surface of panel 110, thereby achieving a uniform, continuous, and stable peeling action at the adhesive interface between panel 110 and core material 120.

[0045] However, in traditional adhesive strength testing devices, the peeling cylinder 420 and its flanges 421 at both ends are typically set to a constant radius. In the initial stage of peel loading, the bending moment and peeling moment applied by the peeling cylinder 420 to the panel 110 act synchronously at the adhesive interface. Only a small portion of the moment is used to achieve adhesive peeling, while the majority is used for forced bending deformation of the panel 110. Before the adhesive interface reaches a stable peel state, bending stress continues to accumulate. When the bending stress and peeling stress together exceed the adhesive bonding strength limit, a sudden and rapid crack propagation occurs at the adhesive interface between the panel 110 and the core material 120, resulting in an extremely high initial load peak in the load curve. Since this initial peak mainly originates from the instantaneous bending stiffness of the panel 110 rather than the actual cracking resistance of the adhesive layer, it is usually considered a system impact artifact and discarded in existing data processing standards. This leads to the loss of key data reflecting the initial cracking toughness of the adhesive layer, making it impossible to accurately assess the adhesive structure's resistance to microcrack initiation and the risk of early failure.

[0046] Based on this, the outer peripheral surface of the peeling cylinder 420 is set as a guide surface with a curvature that continuously increases along the peeling direction, and the guide surface forms a continuously gradually changing peeling path.

[0047] Specifically, the guide surface adopts a vortex-shaped curved surface structure, with the smallest radius of curvature at the starting point, gradually increasing along the circumference of the peeling cylinder 420; correspondingly, the flange 421 that mates with the peeling cylinder 420 adopts the same vortex-shaped profile as the peeling cylinder 420. This vortex-shaped curved surface structure causes the radius of rotation of the peeling cylinder 420 and the radius of rotation of the flange 421 to continuously increase along the peeling direction, thereby forming a peeling torque that increases slowly with the rotation angle, so as to achieve a soft start of the peeling process.

[0048] In the initial stage of the peeling loading phase, as the drive cylinder moves the lifting plate 310 upward, the loading belt 422 is gradually tightened, thereby pulling the peeling cylinder 420 to roll and rotate upward on the surface of the panel 110. Because the starting radius of the peeling cylinder 420 is extremely small, the panel 110 only requires minimal bending deformation to adhere to the guide surface, thus requiring a small initial torque for peeling. At this time, the energy input by the drive cylinder is mainly used to overcome the initial static friction of the adhesive interface and to gradually deform the panel 110 along the guide surface of the vortex-shaped curved surface structure of the peeling cylinder 420. As the peeling cylinder 420 continues to rotate, the bending process of the panel 110 occurs gradually along the guide surface with gradually increasing curvature, avoiding a sudden accumulation of elastic potential energy in the panel 110. Energy is continuously input at a relatively gentle rate, causing the peeling torque to slowly increase from a minimum value. The peeling force loading curve presents a slope that smoothly climbs from zero.

[0049] The curve only shows its first inflection point or slight drop when the load reaches the critical value at which the adhesive layer resists the propagation of microcracks. The load value corresponding to this inflection point truly represents the critical load for the initial cracking of the adhesive layer, i.e., the initiation toughness. This critical value directly reflects the adhesive layer's tolerance to initial defects and resistance to microcrack propagation, which is a key fracture mechanics indicator for evaluating the early failure risk of bonded structures. Simultaneously, the vortex profile of the flange 421 ensures that the force application point of the loading band 422 always maintains a reasonable lever arm relationship with the rotation center of the peeling cylinder 420, allowing the entire peeling process to smoothly transition to a steady state, reducing sudden load changes and peeling jumps, thereby ensuring the accuracy and reliability of the test results.

[0050] In particular, due to the inherent rigidity of the panel 110 and the dynamic nature of the peeling process, when it is peeled from the core material 120 and bent and wound into the peeling cylinder 420, the resistance to bending forces can easily cause minute gaps or incomplete adhesion between the panel 110 and the surface of the peeling cylinder 420. Simultaneously, the dynamic changes in the adhesive's cohesive energy and interfacial adhesion can easily lead to a "stick-slip" phenomenon during the peeling process, i.e., alternating pauses and sudden jumps. This can instantly change the tension of the panel 110, disrupt the adhesion, introduce additional bending resistance, and cause fluctuations in the load curve, affecting the accuracy of the test data.

[0051] By setting the outer circumferential surface of the peeling cylinder 420 as a vortex structure with curvature continuously increasing along the peeling direction, the relative sliding speed between the panel 110 and the peeling cylinder 420 at the contact point can be gradually established from zero, effectively suppressing the severe "stick-slip" phenomenon at the initial peeling point. At the same time, the gradual curvature creates a gentle, gradual bending effect on the panel 110, ensuring it uniformly conforms to the vortex surface of the peeling cylinder 420, avoiding undesirable conditions such as suspension or top edge defects, reducing sudden load changes and skip peeling phenomena in the initial peeling section, eliminating additional bending resistance caused by poor fit, and further improving the authenticity and stability of the initial peeling force data.

[0052] Furthermore, in order to ensure that the core material 120 remains vertical during the peeling process and to avoid uneven bending of the panel 110, skewed peeling trajectory, and distortion of load data due to horizontal deviation, the adhesive strength testing device for the honeycomb panel provided in this embodiment of the invention is also equipped with a synchronization component.

[0053] Specifically, the synchronization component includes a transmission structure, which includes a mounting frame 340, a synchronization roller 350, and a synchronization belt 360.

[0054] The mounting frame 340 is a hollow square frame structure. The mounting frame 340 is fixedly installed below the lifting plate 310 and covers the outside of the first clamping plate 320 and the first fixing plate 330.

[0055] A sliding block 321 is fixedly provided on the upper end of the first clamping plate 320, and a horizontal groove with an opening facing downward is provided on the lifting plate 310. The sliding block 321 can be embedded in the horizontal groove to realize the first clamping plate 320 sliding connection on the lifting plate 310 in the horizontal direction.

[0056] The outer peripheral surface contour of the synchronous roller 350 is designed to have the same curvature variation law as the guide surface of the stripping cylinder 420. The synchronous roller 350 is rotatably connected to the mounting frame 340, and the outer wall of the synchronous roller 350 is always in close contact with the outer wall of the first fixed plate 330. A limit rod 331 is fixedly provided on the first fixed plate 330. The two end faces of the synchronous roller 350 are provided with sliding grooves 351 that match the limit rods 331. The extended contour of the sliding grooves 351 is consistent with the outer peripheral surface contour of the synchronous roller 350. The limit rods 331 are slidably embedded in the sliding grooves 351, thereby enabling the synchronous roller 350 to smoothly drive the first clamping plate 320 and the first fixed plate 330 to move horizontally on the lifting plate 310 through the limit rods 331 when rotating.

[0057] Vertical plates 411 extend from both axial ends of the peeling cylinder 420, and a first drive wheel 423 is coaxially fixed at each end. Mounting brackets 340 extend from both axial ends of the synchronous roller 350, and a second drive wheel 352 is coaxially fixed at each end. Both the first drive wheel 423 and the second drive wheel 352 are circular drive structures. The synchronous belt 360 is an annular structure, wound around the first drive wheel 423 and the second drive wheel 352 to achieve synchronous rotation of the peeling cylinder 420 and the synchronous roller 350.

[0058] During the peeling loading stage, the peeling cylinder 420 rotates around its own axis under the action of the loading belt 422. As the peeling cylinder 420 continues to rotate, the radius of rotation at the contact point between the peeling cylinder 420 and the panel 110 continuously increases along the peeling direction, causing the lower end of the panel 110 and the lower end of the core material 120 to move synchronously and smoothly in the horizontal direction. The rotational motion of the peeling cylinder 420 is transmitted to the synchronous roller 350 through the transmission connection of the first transmission wheel 423, the synchronous belt 360, and the second transmission wheel 352, so that the synchronous roller 350 and the peeling cylinder 420 rotate synchronously. During the rotation of the synchronous roller 350, the sliding groove 351 at the end of the synchronous roller 350 slides relative to the limiting rod 331 on the first fixed plate 330. The outer wall of the synchronous roller 350 pushes the first clamping plate 320 to slide along the transverse groove of the lifting plate 310, thereby driving the upper end of the panel 110 and the upper end of the core material 120 to move horizontally in sync with the lower end of the core material 120. This ensures that the core material 120 remains vertical throughout the peeling process, eliminates the peeling angle deviation caused by the tilt of the core material 120, ensures that the bending deformation of the panel 110 is uniform and consistent, and that the peeling trajectory remains constant. Ultimately, this achieves accurate acquisition of peeling force data and accurate evaluation of adhesive strength.

[0059] During the movement of the lifting plate 310, the relative position of the stripping cylinder 420 and the synchronous roller 350 changes, resulting in a change in the tension of the synchronous belt 360. Therefore, the synchronization assembly also includes a tensioning unit, which comprises a moving plate 370 and an elastic element.

[0060] The movable plate 370 extends along the width of the mounting frame 340, is located inside the mounting frame 340, and is slidably connected to the mounting frame 340 in the horizontal direction. Both ends of the movable plate 370 extend out of the mounting frame 340, and each extended end is rotatably connected to a tensioning pulley 371. The synchronous belt 360 simultaneously winds around the first drive pulley 423, the second drive pulley 352, and the two tensioning pulleys 371, forming a stable winding path.

[0061] The elastic element is a compression spring 380, and two springs are provided. One end of one compression spring 380 is fixedly connected to the first clamping plate 320, and the other end is fixedly connected to the first end face of the moving plate 370; one end of the other compression spring 380 is fixedly connected to the second end face of the moving plate 370, and the other end is fixedly connected to the inner wall of the mounting bracket 340 facing the moving plate 370. The resultant force of the two compression springs 380 always keeps the moving plate 370 in the middle position between the mounting bracket 340 and the first clamping plate 320, so as to achieve self-adaptive centering of the tension wheel 371.

[0062] During the movement of the lifting plate 310, the center distance between the peeling cylinder 420 and the synchronous roller 350 changes, and the tension of the synchronous belt 360 changes accordingly. At this time, under the tension of the synchronous belt 360, the tensioning wheel 371 drives the moving plate 370 to slide horizontally on the mounting frame 340. The two compression springs 380 adaptively adjust the position of the moving plate 370, continuously compensating for the tension changes of the synchronous belt 360, and ensuring that the peeling cylinder 420 and the synchronous roller 350 always maintain a stable synchronous rotation state.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A device for testing the adhesive strength of honeycomb panels, characterized in that, include: A honeycomb panel, the honeycomb panel comprising a face panel and a core material adhered to the face panel; frame; A peeling assembly includes a first clamping unit and a second clamping unit for clamping the two ends of the panel respectively. The second clamping unit has a peeling path with gradually increasing curvature. During the peeling process, the panel is gradually bent and peeled along the peeling path. A synchronization component, which is used to keep the core material in a preset orientation during the peeling process; A drive assembly for driving the first clamping unit to move relative to the frame to perform a peeling operation.

2. The adhesive strength testing device for honeycomb panels according to claim 1, characterized in that, The second clamping unit includes a peeling cylinder and a third clamping plate; the peeling cylinder is movably mounted on the frame, and the outer peripheral surface of the peeling cylinder is configured as a guide surface with curvature continuously increasing along the peeling direction, the guide surface forming the peeling path; the third clamping plate is fixedly connected to the peeling cylinder by bolts, and the third clamping plate is used to clamp the lower end of the panel together with the peeling cylinder; The peeling cylinder has flanges extending radially outward and coaxially at both ends. The outer peripheral surface contour of the flanges is consistent with the curvature change law of the guide surface. A loading belt is wrapped around the outer peripheral surface of the flanges. One end of the loading belt is fixedly connected to the frame. The loading belt is used to drive the peeling cylinder to rotate when it moves.

3. The adhesive strength testing device for honeycomb panels according to claim 2, characterized in that, The second clamping unit further includes a fixing frame, which is fixedly connected to the frame. The fixing frame is provided with a guide groove extending in the vertical direction. Both ends of the peeling cylinder are slidably disposed in the guide groove to guide the peeling cylinder to move in the vertical direction.

4. The adhesive strength testing device for honeycomb panels according to claim 2, characterized in that, The first clamping unit includes a lifting plate, a first clamping plate, and a first fixing plate; the lifting plate is movably mounted on the frame; the upper end of the first clamping plate is connected to the lifting plate; the first fixing plate is fixedly connected to the first clamping plate by bolts, and the first fixing plate is used to clamp the upper end of the panel together with the first clamping plate. The drive assembly includes a drive cylinder, which is used to drive the lifting plate to move in the vertical direction.

5. The adhesive strength testing device for honeycomb panels according to claim 4, characterized in that, The upper end of the first clamping plate is slidably connected to the lifting plate in the horizontal direction; the synchronization component includes a transmission structure, which is used to drive the first clamping plate to slide in the horizontal direction during the peeling process so that the upper end and the lower end of the core material move synchronously.

6. The adhesive strength testing device for honeycomb panels according to claim 5, characterized in that, The transmission structure includes a mounting frame, a synchronous roller, and a synchronous belt; the mounting frame is disposed on the lifting plate; the synchronous roller is rotatably connected to the mounting frame, the outer peripheral contour of the synchronous roller is consistent with the outer peripheral contour of the peeling cylinder, and the outer wall of the synchronous roller is in contact with the first fixed plate; the synchronous belt connects the peeling cylinder and the synchronous roller, and is used to make the synchronous roller and the peeling cylinder rotate synchronously during the peeling process.

7. The adhesive strength testing device for honeycomb panels according to claim 6, characterized in that, A limiting rod is provided on the first fixed plate, and a sliding groove is provided on the synchronous roller to cooperate with the limiting rod. The extended contour of the sliding groove is consistent with the outer peripheral surface contour of the synchronous roller, and the limiting rod is slidably embedded in the sliding groove.

8. The adhesive strength testing device for honeycomb panels according to claim 6, characterized in that, The synchronization component also includes a tensioning unit for adaptively adjusting the tension of the synchronization belt.

9. The adhesive strength testing device for honeycomb panels according to claim 8, characterized in that, The tensioning unit includes a movable plate and an elastic element; the movable plate is slidably disposed within the mounting frame in a horizontal direction, and both ends of the movable plate extend out of the mounting frame and are rotatably connected to tensioning wheels; the synchronous belt is simultaneously connected to the peeling cylinder, the synchronous roller, and the tensioning wheels; the elastic element is disposed between the movable plate and the mounting frame, and the elastic force of the elastic element always keeps the movable plate at the middle position between the mounting frame and the first clamping plate.

10. The adhesive strength testing device for honeycomb panels according to claim 9, characterized in that, The two ends of the stripping cylinder are coaxially fixedly provided with a first transmission wheel, the two ends of the synchronous roller are coaxially fixedly provided with a second transmission wheel, and the synchronous belt is wound around the first transmission wheel, the second transmission wheel and the tensioning wheel.

Images