Foaming adhesive film penetrability testing tool

Abstract

The utility model discloses a foaming adhesive film penetrability test tool, which comprises a base, the testing platform is arranged on the base through a plurality of adjusting supports and is used for bearing a foaming adhesive film to be tested; the calibration mechanism is used for detecting the levelness of the test platform; the bracket is arranged on the base; and the load loading mechanism is arranged on the bracket and is used for applying a load to the to-be-tested foaming adhesive film. According to the utility model, the quantitative test characterization of the penetrability of the foaming adhesive film is realized, the dependence on the skill level of an operator can be effectively reduced, meanwhile, the stability and reproducibility of a test result can be improved, and the device is suitable for the penetrability test of various types of adhesive films and other flexible materials.

Description

Technical Field

[0001] This utility model belongs to the field of composite material penetration testing technology, specifically relating to a foamed film penetration testing fixture. Background Technology

[0002] Honeycomb sandwich structures have high strength, high bending stiffness, and low density, and are widely used in aircraft and helicopter structures, such as wall panels, tail booms, antenna radomes, and cabin floors. However, due to the limitation of honeycomb size, honeycomb cores usually need to be spliced ​​to meet size and configuration requirements during the molding of large-size or high-curvature sandwich structure components. There are three main splicing methods: direct splicing, film + aramid thread stitching, and sheet foam film splicing. Among them, honeycomb sandwich structures spliced ​​with foam film have the best bending performance and are widely used in actual production processes.

[0003] Due to the specific requirements of honeycomb splicing, the expanding foam needs to have certain adhesive strength and penetration to improve the splicing strength. However, current performance evaluation of expanding foam is still based on traditional testing methods, such as expansion rate and single-overlap shear, which characterize adhesive properties. Methods for evaluating the penetration performance of expanding foam films under real production conditions are lacking. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a foamed film penetration testing fixture, which enables quantitative testing and characterization of the penetration performance of foamed films. This fixture effectively reduces reliance on operator skill levels and improves the stability and reproducibility of test results. It is suitable for penetration testing of various types of films and other flexible materials.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] In a first aspect, a permeability testing fixture for a foamed adhesive film is provided, comprising: a base; a test platform mounted on the base via several adjusting supports for supporting the foamed adhesive film to be tested; a calibration mechanism for detecting the levelness of the test platform; a bracket disposed on the base; and a load loading mechanism disposed on the bracket for applying a load to the foamed adhesive film to be tested.

[0007] Furthermore, the calibration mechanism includes: a calibration link and a bar level mounted on the calibration link; the calibration link is mounted on the base via a calibration support, and the calibration link is hinged to the calibration support.

[0008] Furthermore, one end of the calibration link extends above the test platform, and the distance d from the center of the test platform to the calibration link satisfies: r1<d≤r2, where r1 represents the radius of the area in contact between the load loading mechanism and the foam film to be tested, and r2 represents half of the radius of the test platform.

[0009] Furthermore, the support includes a loading platform parallel to the base, and several legs connecting the base and the loading platform; a sleeve with a vertical axis passes through the loading platform and is fixedly connected to the loading platform.

[0010] Furthermore, the center of the base coincides with the center of the loading platform, and several of the support legs are evenly distributed around the center of the base and the loading platform.

[0011] Furthermore, the load loading mechanism includes a pressure rod, which is installed inside the sleeve via a ball bushing; one end of the pressure rod is provided with a load loading rod for bearing weights, and the other end is provided with a test pressure head for abutting against the foamed film to be tested.

[0012] Furthermore, the pressure rod is provided with several weight-reducing holes.

[0013] Furthermore, the pressure rod is equipped with a pointer, and the sleeve is equipped with scale lines for marking the moving distance of the load loading mechanism.

[0014] Furthermore, an operating handle is provided on the pressure rod.

[0015] Secondly, a method for testing the penetration performance of a foamed film is provided, based on the foamed film penetration testing fixture described in the first aspect. The method includes: first, placing the foamed film to be tested on a test platform, and then adjusting the level of the test platform through a calibration mechanism; after adjusting the level of the test platform, installing a load loading mechanism with a set weight on a support, and recording the position of the test indenter of the load loading mechanism when it just contacts the foamed film to be tested, and the distance L that the load loading mechanism moves under gravity after a set time; the distance L is used to evaluate the penetration performance of the foamed film under a set load and a set time.

[0016] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: By designing the specific structure of the foam film penetration test fixture, including a base, a test platform for supporting the foam film to be tested, and a load loading mechanism for applying load to the foam film to be tested, this utility model realizes the quantitative testing and characterization of the penetration performance of foam film. It can effectively reduce the dependence on the skill level of the operator, and at the same time improve the stability and reproducibility of the test results. It is suitable for penetration testing of various types of films and other flexible materials. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of a foamed film penetration testing fixture provided in an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of the planar structure of a foamed film penetration testing fixture provided in an embodiment of this utility model;

[0019] In the diagram: 10. Base; 11. Loading platform; 12. Support leg; 13. Sleeve; 14. Test starting position; 15. Knob; 20. Test platform; 30. Calibration linkage; 31. Bar level; 32. Calibration support; 40. Pressure bar; 41. Ball bushing; 42. Loading rod; 43. Test indenter; 44. Pointer; 45. Operating handle. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0021] Example 1

[0022] like Figure 1 , Figure 2 As shown, a foamed film penetration test fixture includes a base 10; a test platform 20 mounted on the base 10 via several adjustable supports for supporting the foamed film to be tested; a calibration mechanism for detecting the levelness of the test platform 20; a bracket disposed on the base 10; and a load loading mechanism disposed on the bracket for applying a load to the foamed film to be tested.

[0023] The calibration mechanism includes a calibration link 30 and a bar level 31 mounted on the calibration link 30. The calibration link 30 is mounted on the base 10 via a calibration support 32, and the calibration link 30 is hinged to the calibration support 32. One end of the calibration link 30 extends above the test platform 20, and the distance d from the center of the test platform 20 to the calibration link 30 satisfies: r1 < d ≤ r2, where r1 represents the radius of the contact area between the load loading mechanism and the foam film to be tested, and r2 represents half the radius of the test platform 20. By limiting the distance from the center of the test platform 20 to the calibration link 30, sufficient contact between the calibration link 30 and the test platform 20 can be ensured. The bar level 31 is used to indicate the levelness of the calibration link 30. With sufficient contact between the calibration link 30 and the test platform 20, the levelness of the test platform 20 can be further calibrated through the calibration link 30.

[0024] The test platform 20 is mounted on the base 10 via four adjustable supports. Each adjustable support is equipped with a knob 15. By adjusting the knob 15, the vertical position of the test platform 20 in different orientations can be adjusted, thereby cooperating with the calibration mechanism to complete the adjustment of the level of the test platform 20.

[0025] The support includes a loading platform 11 parallel to the base 10 and three legs 12 connecting the base 10 and the loading platform 11. A sleeve 13 with a vertical axis passes through the loading platform 11 and is fixedly connected to it. The center of the base 10 coincides with the center of the loading platform 11, and the three legs 12 are evenly distributed around the centers of the base 10 and the loading platform 11. In this invention, by setting three legs 12 evenly distributed around the centers of the base 10 and the loading platform 11, and jointly supporting them between the base 10 and the loading platform 11, the stability and load-bearing capacity of the loading platform 11 can be improved. At the same time, sufficient operating space can be reserved between the base 10 and the loading platform 11, improving the convenience of operation.

[0026] The load loading mechanism includes a pressure rod 40, which is mounted inside the sleeve 13 via a ball bushing 41. One end of the pressure rod 40 is equipped with a load loading rod 42 for supporting weights, and the other end is equipped with a test pressure head 43 for abutting against the foamed film to be tested. By setting the ball bushing 41, the friction between the inner wall of the sleeve 13 and the pressure rod 40 can be reduced, ensuring that the force acting on the foamed film to be tested is more accurate during testing.

[0027] The pressure rod 40 is equipped with several weight-reducing holes. Since the weight acting on the tested foam film is the sum of the weight of the load-loading mechanism itself and the weight of the weights on the load-loading rod 42, the weight-reducing holes minimize the weight of the load-loading mechanism, thereby expanding the detection range of the entire device and improving detection accuracy. Each weight-reducing hole occupies no more than 50% of the surface area of ​​the pressure rod 40, ensuring that the pressure rod 40 retains sufficient strength and stability even after the weight-reducing holes are installed.

[0028] A pointer 44 is provided on the pressure rod 40, and a scale line is provided on the sleeve 13 to mark the moving distance of the load loading mechanism. By recording the scale line pointed to by the pointer 44 at the beginning of the test and at the end of the test, the moving distance of the load loading mechanism can be calculated. This moving distance is used to evaluate the penetration performance of the foam film under a set load and a set time.

[0029] An operating handle 45 is provided on the pressure bar 40. The operating handle 45 is used to raise or lower the entire load loading mechanism before and after the test.

[0030] The method of using the foamed film penetration testing fixture of this utility model is as follows:

[0031] (1) Place the base 10 and bracket of the tooling on the calibrated marble platform;

[0032] (2) Place the foam film to be tested on the test platform 20 and adjust the knob 15 below it until the bubble of the bar level 31 on the calibration link 30 is centered;

[0033] (3) Insert the pressure rod 40 into the sleeve 13, raise the pressure rod 40 by operating the handle 45, and ensure that the test pressure head 43 does not contact the foam film to be tested. Place the weight or other heavy objects on the load loading rod 42 according to the required counterweight.

[0034] (4) Gently lower the pressure bar 40 by operating the handle 45 until the pointer 44 reaches the 0 mark (i.e., the test start position 14). (At this time, the test head 43 is just in contact with the upper surface of the foam film to be tested). Release the handle 45 and start timing. Under the given load, let the test head penetrate the film.

[0035] (5) When the required load is applied, read the position of pointer 44 and record the downward stroke of test head 43 as the film penetration performance.

[0036] This utility model's testing fixture is made of stainless steel or aerospace-grade aluminum, making it inexpensive, simple in structure, and easy to manufacture and carry. By adjusting the vertical position of the testing platform, the pointer is ensured to always be at the 0 mark when the testing indenter begins contact with the film under test, reducing human error and improving the stability and reproducibility of the test results. It also facilitates operation for inexperienced personnel, lowering the skill requirements for operators. The testing method of this utility model is simple in principle and has wide applications. It can be used for penetrating performance testing of various flexible materials under multiple loads.

[0037] Example 2

[0038] Based on the foamed film penetration testing fixture described in Embodiment 1, this embodiment provides a foamed film penetration testing method, including:

[0039] First, place the foam film to be tested on the test platform 20, and then adjust the level of the test platform 20 through the calibration mechanism;

[0040] After adjusting the level of the test platform 20, the load loading mechanism with the set weight is installed on the bracket, and the position of the test pressure head 43 of the load loading mechanism when it just touches the foam film to be tested, and the distance L that the load loading mechanism moves under gravity after a set time are recorded; the distance L is used to evaluate the penetration performance of the foam film under the set load and set time.

[0041] The following is a specific film test procedure to further illustrate the method of penetration testing. Test environment requirements: temperature 23±2℃, humidity 50±10%.

[0042] Step 1: Place the base 10 and bracket of the tooling on the calibrated marble platform and confirm that it is level using a level.

[0043] Step 2: Cut 3 sheets of LOCTITE EF 562 50M AERO film using a 50mm diameter sampling block, and lay them together in sequence, keeping the protective paper on the top and bottom surfaces.

[0044] Step 3: Remove the protective film from the previous step, place it on the test platform 20, and adjust the knob 15 below it until the bubble of the bar level 31 on the calibration linkage 30 is centered.

[0045] Step 4: Insert the pressure rod 40 into the sleeve 13, raise the pressure rod 40 by operating the handle 45, and ensure that the test pressure head 43 does not contact the film to be tested. Place the 90g weight (185g including the 95g weight of the pressure rod) on the load loading rod 42.

[0046] Step 5: Hold the operating handle 45 and gently lower the pressure rod 40 until the pointer 44 on the pressure rod 40 indicates the 0 mark (i.e., the test start position 14). (At this time, the test head 43 is just in contact with the upper surface of the film to be tested). Release the operating handle 45 and start timing. Under the given load, let the test head 43 penetrate the film.

[0047] Step 6: When the penetration time reaches (300±10) s, read the position of pointer 44 and record the downward stroke of test head 43, which is the film penetration performance.

[0048] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A testing fixture for the penetration of a foamed adhesive film, characterized in that, include: Base (10); The test platform (20) is mounted on the base (10) by several adjustable supports and is used to support the foamed film to be tested. A calibration mechanism for detecting the levelness of the test platform (20); A bracket is mounted on the base (10); A load loading mechanism mounted on the support for applying load to the foamed film to be tested.

2. The foamed film penetration testing fixture according to claim 1, characterized in that, The calibration mechanism includes: a calibration link (30) and a bar level (31) mounted on the calibration link (30); the calibration link (30) is mounted on the base (10) via a calibration support (32), and the calibration link (30) is hinged to the calibration support (32).

3. The foamed film penetration testing fixture according to claim 2, characterized in that, One end of the calibration link (30) extends above the test platform (20), and the distance d from the center of the test platform (20) to the calibration link (30) satisfies: r1<d≤r2, where r1 represents the radius of the area in contact between the load loading mechanism and the foam film to be tested, and r2 represents half of the radius of the test platform (20).

4. The foamed film penetration testing fixture according to claim 1, characterized in that, The support includes a loading platform (11) parallel to the base (10), a plurality of legs (12) connecting the base (10) and the loading platform (11), and a sleeve (13) with a vertical axis passing through the loading platform (11) and fixedly connected to the loading platform (11).

5. The foamed film penetration testing fixture according to claim 4, characterized in that, The center of the base (10) coincides with the center of the loading platform (11), and a plurality of the legs (12) are evenly distributed around the center of the base (10) and the loading platform (11).

6. The foamed film penetration testing fixture according to claim 4, characterized in that, The load loading mechanism includes a pressure rod (40), which is installed in the sleeve (13) through a ball bushing (41); one end of the pressure rod (40) is provided with a load loading rod (42) for bearing weights, and the other end is provided with a test pressure head (43) for abutting against the foam film to be tested.

7. The foamed film penetration testing fixture according to claim 6, characterized in that, The pressure rod (40) is provided with several weight-reducing holes.

8. The foamed film penetration testing fixture according to claim 6, characterized in that, The pressure rod (40) is provided with a pointer (44), and the sleeve (13) is provided with a scale line for marking the moving distance of the load loading mechanism.

9. The foamed film penetration testing fixture according to claim 6, characterized in that, An operating handle (45) is provided on the pressure rod (40).

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