A device for batch preparation of adhesive butt joint tensile strength square test bar samples

Abstract

This utility model relates to the field of tensile strength testing technology for adhesive butt joints, and discloses a batch preparation device for square test bar specimens of adhesive butt joint tensile strength testing. The device includes: a base for fixing the test bars; a limiter placed between the test bars to control the adhesive layer thickness and the side length of the test bar specimens; and a top cover pressure seat located above the test bars to fix them and apply pressure to the adhesive layer between the test bars to ensure a dense adhesive layer. This device can quickly and efficiently prepare test bars in batches, ensuring uniform adhesive layer thickness and stable adhesion. Furthermore, it can accommodate test bars of various sizes without the need for re-processing molds, significantly improving sample preparation quality and flexibility.

Description

Technical Field

[0001] This utility model relates to the field of tensile strength testing technology for adhesive butt joints, and more specifically, to a batch preparation device for tensile strength test bar specimens of adhesive butt joints. Background Technology

[0002] As the automotive and railway vehicle industries move towards lightweighting and high performance, various hybrid materials such as aluminum, carbon fiber composites, high-strength steel, and magnesium alloys are widely used in vehicle manufacturing. Traditional welding techniques have significant limitations in joining these hybrid material components, making it difficult to reliably connect dissimilar materials such as steel and aluminum, or carbon fiber and metal. Adhesives, with their excellent compatibility with dissimilar materials, can not only achieve high-strength connections but also significantly reduce the use of fasteners such as rivets and bolts, effectively reducing the overall weight of the vehicle body. This has made adhesives a key connection solution in the technological innovation of modern automotive manufacturing.

[0003] As a polymer material, the bonding performance of adhesives to substrates is affected not only by the surface treatment process of the substrate but also by the adhesive's own formulation. Furthermore, the operating environments of automobiles and rail vehicles are complex, such as high altitudes with low air pressure and humid, hot, and humid conditions. To assess the adaptability of adhesives in different environments, a large number of standardized specimens need to be prepared for tensile strength testing. Currently, the preparation and evaluation of tensile strength specimens for adhesive butt joints mainly follow GB / T 6329-1996 "Determination of Tensile Strength of Adhesive Butt Joints." This standard specifies the specimen types, including square test bars with side lengths of 10mm, 15mm, 25mm, or 50mm, and a basic preparation fixture structure consisting of a groove, end A, end B, and pressure pads. This provides a basic technical basis for the industry. However, this preparation fixture structure is complex and cumbersome to operate, making it impossible to prepare multiple sets of specimens simultaneously, thus posing significant limitations for batch preparation.

[0004] The patent with publication number CN220339817U discloses a sample preparation device for tensile strength testing of adhesive butt joints. It solves the problems of uneven adhesive layer thickness during the preparation of tensile test specimens of adhesive butt joints and the difficulty in removing the specimens and cleaning the device due to the overflow of adhesive during the preparation process. However, the device cannot prepare multiple samples at the same time.

[0005] The patent with publication number CN218239586U discloses a fixture for making test specimens for tensile strength of butt joints, which can simplify the specimen preparation process and can prepare multiple sets of specimens at the same time. However, it fixes the test bar through a mold cavity structure of a specific size. If it is necessary to prepare specimens with test bars of different sizes, the mold needs to be re-processed. A single mold cannot be used flexibly.

[0006] Therefore, there is a need for a device that can rapidly, efficiently, and with guaranteed quality prepare tensile strength test bar specimens for adhesive butt joints in large quantities. Utility Model Content

[0007] The purpose of this invention is to provide a batch preparation device for tensile strength test bar specimens of adhesive butt joints, in order to solve the problems existing in the prior art. This device can quickly and efficiently prepare test bars in batches, ensuring uniform adhesive layer thickness and stable bonding. Moreover, it can adapt to test bars of various sizes without reprocessing molds, significantly improving the quality and flexibility of sample preparation.

[0008] To achieve the above objectives, this utility model provides the following solution: This utility model provides a batch preparation device for tensile strength test bar specimens of adhesive butt joints, comprising: a base for fixing the test bars; a limiter placed between the test bars and used in conjunction with the test bars to control the adhesive layer thickness and the side length of the test bar specimens; and an upper cover pressure seat located above the test bars for fixing the test bars and applying pressure to the adhesive layer between the test bars to ensure that the adhesive layer is dense.

[0009] According to the present invention, a batch preparation device for tensile strength test bar specimens of adhesive butt joints is provided. The test bar includes a first test bar and a second test bar. The first test bar and the second test bar have the same structure. The first test bar is installed on the base, and the second test bar is located above the first test bar. The second test bar is installed on the upper cover pressure seat, and the limiter is located between the first test bar and the second test bar.

[0010] According to the present invention, a batch preparation device for tensile strength test bar specimens of adhesive butt joints is provided. The first test bar and the second test bar each include a planar part and a vertical part. The planar part and the vertical part are perpendicularly arranged and fixedly connected. The vertical part of the first test bar is mounted on the base, and the vertical part of the second test bar is mounted on the upper cover pressure seat. The limiter is installed between the planar part of the first test bar and the planar part of the second test bar.

[0011] According to the present invention, a batch preparation device for tensile strength test bar specimens of adhesive butt joints is provided, wherein a first slot is provided on the base, and the vertical part of the first test bar is installed in the first slot.

[0012] According to the present invention, a batch preparation device for tensile strength test bar specimens of adhesive butt joints is provided, wherein a second slot is provided on the upper cover pressure seat, and the vertical part of the second test bar is installed in the second slot.

[0013] According to the present invention, a batch preparation device for tensile strength test bar specimens of adhesive butt joints is provided, wherein the limiting device includes a limiting strip, and the limiting strip is adapted to the planar portion.

[0014] According to the present invention, a batch preparation device for tensile strength test bar specimens of adhesive butt joints is provided, wherein the test bar is a T-shaped long strip structure and the limiter is an H-shaped structure.

[0015] According to the present invention, a batch preparation device for tensile strength test bar specimens of adhesive butt joints is provided, wherein the lengths of the base and the upper cover pressure seat are adapted to the length of the test bar.

[0016] The present invention discloses the following technical effects:

[0017] In this invention, the test rods are fixed by a base and a top cover pressure seat, preventing lateral displacement or longitudinal warping of the test rods during adhesive application and pressure application. The top cover pressure seat cooperates with the base to fix another set of test rods from above, ensuring that the two sets of test rods remain parallel and aligned during the docking process. This fixing method solves the problem of test rods easily shifting, causing misalignment of the sample bonding and excessive side length in existing simple devices, reducing the error in the test rod docking accuracy and providing a basic guarantee for the subsequent batch preparation of qualified samples. A limiter is placed between the test rods, and the limiter limits the distance between the two sets of test rods by its own thickness, preventing the adhesive layer from being too thick or too thin due to uneven pressure during adhesive application. Uniform pressure can be achieved by the weight of the top cover pressure seat itself, and the pressure can be stably applied to the adhesive layer between the two sets of test rods, effectively expelling air bubbles in the adhesive layer and avoiding local stress concentration or bonding failure caused by the presence of air bubbles. At the same time, uniform pressure can promote full contact between the adhesive and the surface of the test rods, improving the interfacial bonding strength. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of this utility model after assembling the second test bar;

[0021] Figure 3 This is a schematic diagram of the structure of this utility model after the limiter is assembled;

[0022] Figure 4This is a schematic diagram of the base structure in this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the pilot-scale rod of this utility model;

[0024] Figure 6 This is a schematic diagram of the limiter in this utility model;

[0025] The components are: 1. base; 2. limiter; 3. top cover pressure seat; 4. first test bar; 5. second test bar; 6. first slot; 7. limit bar; 8. flat part; 9. vertical part; 10. second slot. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 6 As shown, this utility model provides a batch preparation device for tensile strength test bar specimens of adhesive butt joints, including: a base 1, which is used to fix the test bars; a limiter 2, which is placed between the test bars and used to control the thickness of the adhesive layer and the side length of the test bar specimens; and an upper cover pressure seat 3, which is located above the test bars and is used to fix the test bars and apply pressure to the adhesive layer between the test bars to ensure that the adhesive layer is dense.

[0029] The base 1 is made of marble, which is characterized by high rigidity, strong thermal stability, and resistance to deformation. This ensures that the base 1 does not move or warp during sample preparation, providing stable support for the test rod. The base 1 is elongated, with its length matching the long side of the test rod. If the long side of the test rod is 1m, the length of the base 1 is 1m-1.2m, ensuring uniform stress along the entire length of the test rod. The base 1 and the upper cover pressure seat 3 have the same structure and material. A first slot 6 is formed along the length direction in the middle of the upper surface of the base 1, and a second slot 10 is formed along the length direction in the middle of the lower surface of the upper cover pressure seat 3.

[0030] The test bar includes a first test bar 4 and a second test bar 5. The first test bar 4 and the second test bar 5 have the same structure, which is a T-shaped long strip structure, including a planar part 8 and a vertical part 9 that are perpendicular to each other. The planar part 8 and the vertical part are integrally formed or welded together. The planar part 8 is a rectangular plate structure and is the core area for adhesive coating and mating. The length of its short side directly determines the side length of the final test bar sample. It can be adapted to the 10mm, 15mm, 25mm and 50mm of GB / T 6329-1996 standard, or non-standard sizes can be customized according to requirements. The thickness is 3mm-8mm to ensure structural strength and avoid deformation during sample preparation. The vertical part 9 is a rectangular strip structure. The vertical part 9 matches the cross-sectional shape of the first slot 6 and the second slot 10. The vertical part 9 of the first test rod 4 is inserted into the first slot 6, and the vertical part 9 of the second test rod 5 is inserted into the second slot 10. The vertical part 9 of the first test rod 4 is fixed by the first slot 6, so that the flat part 8 of the first test rod 4 is kept horizontal and upward, providing a reference for subsequent glue application and docking. The vertical part 9 of the second test rod 5 is fixed to the upper cover pressure seat 3 by the second slot 10. The flat parts 8 of the first test rod 4 and the second test rod 5 form a closed glue application space, providing a basic carrier for batch sample preparation.

[0031] The limiter 2 is H-shaped and made of metal. It includes a limit strip 7 and two support strips. The limit strip 7 is located between the two support strips and is integrally formed with the support strips. The limit strip 7 and support strips are engaged with the flat portion 8 of the test bar. Specifically, the lower part of the limit strip 7 is the flat portion 8 of the first test bar 4, and the upper part of the limit strip 7 is the flat portion 8 of the second test bar 5. The thickness of the limit strip 7 is the thickness of the target adhesive layer, and the width of the limit strip 7 is 0.1 mm longer than the shorter side of the flat portion 8 of the test bar, ensuring that the limit strip 7 can smoothly engage with the edge of the flat portion 8 while avoiding excessive gaps that could cause the adhesive layer to shift. At least two limiters 2 are provided, symmetrically arranged at both ends of the flat portion 8 of the test bar.

[0032] The upper cover pressure seat 3 is located at the top and applies uniform pressure to the adhesive layer using its own weight. No additional pressure equipment is required, which simplifies the device structure. The vertical part 9 of the second test rod 5 is fixed by the second slot 10, so that the flat part 8 of the second test rod 5 is horizontally facing down to adhere to the adhesive and the limiting strip 7. At the same time, the weight of the upper cover pressure seat 3 is evenly applied to the second test rod 5, which removes air bubbles in the adhesive layer, ensuring that the adhesive layer is dense and without gaps, and improving the bonding stability between the adhesive and the flat part 8.

[0033] Working principle: The surface of the first test rod 4 is cleaned. The vertical part 9 of the first test rod 4 is inserted into the first slot 6 of the base 1. The flat part 8 of the first test rod 4 is located on the upper surface of the base 1. Limiters 2 are inserted into both ends of the flat part 8 of the first test rod 4 to control the thickness of the adhesive layer and the side length of the test rod. After squeezing an appropriate amount of adhesive into the flat part 8 of the test rod according to the required adhesive layer thickness, the flat part 8 of the second test rod 5, after being cleaned, is inserted into the limiter 2. Finally, the upper cover pressure seat 3 is inserted into the second test rod 5, that is, the second slot 10 is aligned with the vertical part 9 of the second test rod 5 and inserted. The adhesive layer is squeezed by the gravity of the upper cover pressure seat 3. After the adhesive layer is cured by the limiter 2, the excess adhesive on both sides is cut off with a utility knife to obtain a long strip adhesive butt joint tensile strength test rod sample with the required adhesive layer thickness. The prepared long strip adhesive butt joint tensile strength test specimen can be cut into the final size specimen by mechanical cutting. According to GB / T 6329-1996 standard, the square test bar prepared by this patent has a length of 1 meter. After cutting and removing the head and tail, about 80-85 square test bar specimens with a side length of 10mm can be obtained at one time.

[0034] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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. Therefore, they should not be construed as limitations on this utility model.

[0035] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A device for batch preparation of tensile strength test bar specimens for adhesive butt joints, characterized in that, include: Base (1), the base (1) is used to fix the test bar; Limiter (2), the limiter (2) is placed between the test bars and used in conjunction with the test bars to control the thickness of the adhesive layer and the side length of the test bar sample; The upper cover pressure seat (3) is located above the test bar and is used to fix the test bar and apply pressure to the adhesive layer between the test bars to ensure that the adhesive layer is dense.

2. The apparatus for batch preparation of tensile strength test bar specimens for adhesive butt joints according to claim 1, characterized in that: The test bar includes a first test bar (4) and a second test bar (5). The first test bar (4) and the second test bar (5) have the same structure. The first test bar (4) is installed on the base (1), and the second test bar (5) is located above the first test bar (4). The second test bar (5) is installed on the upper cover pressure seat (3), and the limiter (2) is located between the first test bar (4) and the second test bar (5).

3. The apparatus for batch preparation of tensile strength test bar specimens for adhesive butt joints according to claim 2, characterized in that: Both the first test bar (4) and the second test bar (5) include a flat part (8) and a vertical part (9). The flat part (8) and the vertical part (9) are perpendicularly arranged and fixedly connected. The vertical part (9) of the first test bar (4) is mounted on the base (1), and the vertical part (9) of the second test bar (5) is mounted on the upper cover pressure seat (3). The limiter (2) is placed between the flat part (8) of the first test bar (4) and the flat part (8) of the second test bar (5).

4. The apparatus for batch preparation of tensile strength test bar specimens for adhesive butt joints according to claim 3, characterized in that: The base (1) has a first slot (6) and the vertical part (9) of the first test rod (4) is installed in the first slot (6).

5. The apparatus for batch preparation of tensile strength test bar specimens for adhesive butt joints according to claim 3, characterized in that: The upper cover pressure seat (3) is provided with a second slot (10), and the vertical part (9) of the second test rod (5) is installed in the second slot (10).

6. The apparatus for batch preparation of tensile strength test bar specimens for adhesive butt joints according to claim 3, characterized in that: The limiter (2) includes a limit bar (7) which is adapted to the flat part (8).

7. The apparatus for batch preparation of tensile strength test bar specimens for adhesive butt joints according to claim 1, characterized in that: The test bar is a T-shaped long strip structure, and the limiter (2) is an H-shaped structure.

8. The apparatus for batch preparation of tensile strength test bar specimens for adhesive butt joints according to claim 1, characterized in that: The lengths of the base (1) and the upper cover pressure seat (3) are adapted to the length of the test bar.

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