A flat tensile test post-test specimen block and loading block separation device

Abstract

The utility model relates to a kind of plane tensile test sample block and loading block separation device after testing, including base, the support platform of fixed installation in the upper end one side of base, the column of setting in the upper end other side of base and the metal loading block of installation in the inboard of support platform, the front and rear ends of support platform are all installed with limit component, limit component is used to clamping fixed metal loading block, the bottom of column is movably connected with base by displacement component, displacement component is used for adjusting the lateral position of column, the outer surface of column is slidably installed with lifting seat, the inboard of column is provided with driving assembly;The utility model is clamped and fixed to loading block by limit component and elastic buffer gasket, so that wedge-shaped separating knife is attached to the surface of loading block, wedge-shaped separating knife is moved using driving assembly, and with wedge knife penetration, splitting, peeling effect is generated, so that operation is more convenient and fast, and separation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of composite material mechanical testing technology, specifically a device for separating the specimen block and the loading block after a planar tensile test. Background Technology

[0002] In the ASTM C297 standard test, the loading block is bonded to the specimen block with structural adhesive to transfer tensile load. After the test, the specimen block and the loading block usually need to be separated so that the loading block can be reused. However, since the adhesive layer is not completely destroyed, traditional methods such as manual prying and knocking are inefficient and can easily cause deformation or damage to the loading block, affecting reuse. Especially in scenarios with a large number of specimens, the existing separation method is time-consuming and labor-intensive. There is an urgent need for a separation device that is simple in structure, easy to operate and does not damage the loading block. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a device for separating the sample block and the loading block after a planar tensile test. This device makes the separation of the adhesive layer easier and faster, which is convenient for scenarios involving testing a large number of samples. It solves the problems of existing loading block adhesive layer separation methods that easily damage the loading block and are time-consuming and labor-intensive, resulting in low separation efficiency.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a device for separating a sample block from a loading block after a planar tensile test, comprising a base, a support platform fixedly installed on one side of the upper end of the base, a column set on the other side of the upper end of the base, and a metal loading block installed inside the support platform. Limiting components are installed at both the front and rear ends of the support platform, which are used to clamp and fix the metal loading block. The bottom of the column is movably connected to the base through a displacement component, which is used to adjust the lateral position of the column. A lifting seat is slidably installed on the outer surface of the column, and a driving component is provided on the inner side of the column. The driving component is used to drive the lifting seat to move up and down. A pressure groove is opened on the surface of the lifting seat, and a knife holder is installed in the pressure groove. A wedge-shaped separating knife is installed at the other end of the knife holder. A bracket is fixedly installed at the bottom of the surface of the support platform, and a chip collection tray is provided on the bracket.

[0005] Furthermore, the upper end of the support platform has a U-shaped structure, and an elastic buffer pad is provided at the bottom of the inner side of the support platform.

[0006] Furthermore, the limiting assembly includes threaded rods threaded on both sides of the upper end of the support platform, a handle fixedly installed at one end of the threaded rod, and a clamping plate rotatably installed at the other end of the threaded rod. The clamping surface of the clamping plate is provided with a rubber pad. When the handle is rotated to drive the threaded rod, the clamping plates on both sides are attached to the front and rear ends of the metal loading block, clamping and fixing the metal loading block in the support platform.

[0007] Furthermore, the displacement assembly includes a displacement seat fixedly installed on the upper surface of the base, a first ball screw rotatably installed in the displacement seat, and a first nut seat threaded onto the first ball screw. Slide rails are provided on both sides of the displacement seat. The lower end of the first nut seat is slidably connected to the displacement seat through the slide rails, and the first nut seat is fixedly connected to the lower end of the column. An adjusting handle is fixedly installed on the left end of the first ball screw extending to the outside of the displacement seat. When the adjusting handle is rotated to drive the first ball screw to rotate, the first nut seat moves along the axial direction of the first ball screw.

[0008] Furthermore, the drive assembly includes a second ball screw vertically mounted in the column and a second nut seat threaded onto the second ball screw. The upper end of the second ball screw extends to the top of the column and is fixedly mounted with a hand crank. The upper and lower ends of the second ball screw are rotatably connected to the two ends of the column, respectively. The second nut seat is fixedly connected to the lifting seat. When the hand crank is rotated to drive the second ball screw to rotate, the second nut seat moves along the axial direction of the second ball screw.

[0009] It should be noted that the surface of the column has a groove for installing the drive assembly. The second ball screw is installed in the groove, and the end of the second nut seat extends to the outside of the groove to form a fixed fit with the lifting seat. The lifting seat has a slot that matches the column, so that the movement of the lifting seat and the column form a sliding connection.

[0010] Furthermore, a pressure sensor is installed between one end of the tool holder and the lifting seat, and a built-in spring is installed in the pressure groove. The pressure sensor is used to sense the contact pressure between the tool tip and the loading block.

[0011] It is important to note that the pressure sensor is electrically connected to an external display instrument, thereby enabling the monitoring of pressure changes during the separation process of the wedge-shaped separator, ensuring that the load remains within a safe range (not exceeding the limit, i.e., not overloaded).

[0012] Furthermore, a chip collection tray is positioned below the metal loading block and is used to collect detached foam fragments and adhesive debris.

[0013] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0014] 1. The device for separating the sample block from the loading block after the planar tensile test uses a limiting component and an elastic buffer pad to clamp and fix the loading block, so that the wedge-shaped separating blade is attached to the surface of the loading block. The driving component moves the wedge-shaped separating blade, and as the wedge blade goes deeper, it produces a splitting and peeling effect, making the operation more convenient and faster and improving the separation efficiency.

[0015] 2. The separation device for the sample block and the loading block after the planar tensile test uses a manual ball screw to drive the movement of the wedge-shaped separating blade, which makes the operation labor-saving and highly controllable. At the same time, it is equipped with a pressure sensor to provide real-time feedback, ensuring that the separation process is always within the safe load range, avoiding damage to the equipment or workpiece due to overload, and avoiding damage to the surface of the loading block, thus improving the reusability of the loading block.

[0016] 3. The device for separating the sample block from the loading block after the planar tensile test has a wedge-shaped separating blade whose lateral position is adjusted by a displacement component, so that the wedge-shaped separating blade can fit the loading block of different sizes. Combined with a pressure sensor and spring preload, it ensures the contact working force while preventing overload that could cause deformation of the loading block or damage to the blade. Attached Figure Description

[0017] Figure 1 The diagram shown is a schematic representation of the overall structure of this utility model. Figure 1 ;

[0018] Figure 2 The diagram shown is a schematic representation of the overall structure of this utility model. Figure 2 ;

[0019] Figure 3 The diagram shown is a schematic of the column structure of this utility model;

[0020] Figure 4 The diagram shown is a schematic representation of the support platform structure of this utility model.

[0021] Figure 5 The diagram shown is a schematic representation of the internal structure of the column of this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Base; 2. Support platform; 21. Elastic buffer pad; 201. Threaded rod; 202. Clamping plate; 3. Column; 301. Displacement seat; 302. First ball screw; 303. First nut seat; 304. Second ball screw; 305. Second nut seat; 306. Hand crank; 4. Metal loading block; 5. Lifting seat; 6. Pressure groove; 7. Tool holder; 8. Wedge-shaped separating knife; 9. Chip collection tray. Detailed Implementation

[0023] 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.

[0024] With the continuous growth in demand for lightweight structural materials in high-end manufacturing fields such as aerospace, rail transportation, and wind power generation, foam sandwich composite materials have been widely used in various load-bearing and non-load-bearing components due to their high specific strength, excellent thermal and sound insulation performance and good fatigue resistance. Before actual engineering applications, it is necessary to systematically evaluate their key mechanical properties. Among them, the planar tensile strength is one of the core indicators for measuring the bonding quality between the panel and the core material.

[0025] Currently, the internationally accepted testing method is based on ASTM C297 / C297M-19 (Standard Test Method for Flat Tensile Strength of Sandwich Structures) established by the American Society for Testing and Materials (ASTM). This standard stipulates that metal loading blocks are bonded to the surface of the panels at both ends of the foam sandwich specimen to form a "T-shaped" connection structure. An axial tensile force is applied to the loading blocks using a universal testing machine until the specimen fails, thereby determining its maximum load-bearing capacity. In this process, the metal loading blocks, as key intermediate elements for force transmission, play an important role in uniformly introducing external loads to the specimen panels. To ensure test accuracy and repeatability, the loading blocks are usually precision-machined from high-strength aluminum alloy or stainless steel, with strict dimensional tolerances and flatness requirements, resulting in high manufacturing costs.

[0026] Since multiple parallel tests are required for each experiment to ensure data reliability, discarding the loading block after each test would greatly increase testing costs. Therefore, recycling and reusing the metal loading block after the sample is destroyed is an effective way to reduce testing costs and improve resource utilization efficiency. However, although the sample breaks during the tensile process, the structural adhesive layer between the loading block and the residual panel is not completely ineffective and still has strong adhesion, so it must be separated by physical means.

[0027] Currently, laboratories commonly use manual prying, hammering, or localized heating to remove residual foam and adhesive layers. These methods not only rely heavily on the operator's experience and skills but also have significant drawbacks: First, metal tools can easily scratch or deform the bonding surface of the loading block during forceful prying, leading to misalignment or uneven force distribution during subsequent installation, affecting the accuracy of test results. Second, manual operation is inefficient, especially in large-scale testing tasks, where cleaning a single loading block can take several minutes, severely hindering the overall testing pace. Third, the lack of force monitoring during the separation process makes it easy to cause plastic damage or even breakage of the loading block due to excessive force, shortening its lifespan. Finally, the detached foam fragments and adhesive residue are scattered on the work surface, making cleaning difficult and affecting the cleanliness and safety of the laboratory environment.

[0028] More importantly, although the ASTM C297 standard does not explicitly specify the recycling process for the loading blocks, it emphasizes the principles of consistency and repeatability of the testing equipment. Any operation that may change the geometry or surface condition of the loading blocks will introduce additional uncertainties, thereby affecting the reliability of the test data. Therefore, developing a dedicated device that can achieve efficient, controllable, and non-destructive separation has become a key step in improving the standardization of mechanical testing of composite materials.

[0029] In recent years, some studies have attempted to introduce hydraulic or pneumatic drive systems to achieve automated separation. However, such equipment generally suffers from problems such as complex structure, high cost, and difficult maintenance, making it difficult to widely apply in conventional laboratories. In contrast, manual separation devices based on mechanical transmission principles have greater practical value and development potential. By controlling the wedge-shaped cutter to slowly insert into the adhesive layer through a precision transmission mechanism, continuous separation is achieved using a "split-peel" mechanism. With pressure feedback and buffer protection design, separation efficiency and loading block integrity can be significantly improved while ensuring operational safety.

[0030] In summary, research on standardized and specialized separation technologies is of significant engineering importance in addressing the challenge of recycling metal loading blocks after ASTM C297 standard testing. This application proposes a compact, easy-to-operate, low-cost separation device for separating specimen blocks and loading blocks after planar tensile testing, which also features process monitoring capabilities. This device solves the problems of high damage risk, low efficiency, and poor consistency in existing separation methods, and promotes the development of composite material mechanical testing towards a more standardized, efficient, and sustainable direction.

[0031] Please see Figures 1-5 This embodiment of a planar tensile test specimen block and loading block separation device includes a base 1, a support platform 2 fixedly installed on one side of the upper end of the base 1, a column 3 set on the other side of the upper end of the base 1, and a metal loading block 4 installed inside the support platform 2. The upper end of the support platform 2 has a U-shaped structure, and an elastic buffer pad 21 is provided at the bottom of the inner side of the support platform 2. Limiting components are installed at both the front and rear ends of the support platform 2. The limiting components are used to clamp and fix the metal loading block 4. The bottom of the column 3 is movably connected to the base 1 through a displacement component. The displacement component is used to adjust the lateral position of the column 3. A lifting seat 5 is slidably installed on the outer surface of the column 3. A driving component is provided on the inner side of the column 3. The driving component is used to drive the lifting seat 5 to move up and down. A pressure groove 6 is opened on the surface of the lifting seat 5. A knife holder 7 is installed in the pressure groove 6. A wedge-shaped separation knife 8 is installed at the other end of the knife holder 7. A bracket is fixedly installed at the bottom of the surface of the support platform 2. A chip collection tray 9 is provided on the bracket.

[0032] In this embodiment, the chip collection tray 9 is located below the metal loading block 4, and the chip collection tray 9 is used to collect the fallen foam fragments and adhesive debris.

[0033] It should be noted that the metal loading block 4 is clamped and fixed on the support platform 2 by the limiting component, and the wedge-shaped separating blade 8 separates the adhesive layer. During the lifting process, the adhesive layer debris falls into the debris collection tray 9 for collection, while the driving component drives the lifting seat 5 to move, so as to achieve uniform speed movement of the wedge-shaped separating blade 8.

[0034] Please see Figure 1 , Figure 2 and Figure 4 In this embodiment, the limiting component includes a threaded rod 201 threadedly mounted on both sides of the upper end of the support platform 2, a handle fixedly mounted on one end of the threaded rod 201, and a clamping plate 202 rotatably mounted on the other end of the threaded rod 201. The clamping surface of the clamping plate 202 is provided with a rubber pad. When the handle is rotated to drive the threaded rod 201, the clamping plates 202 on both sides are attached to the front and rear ends of the metal loading block 4, clamping and fixing the metal loading block 4 in the support platform 2.

[0035] It should be noted that the threaded structure of the threaded rod 201 has a self-locking capability, thereby adjusting the position of the two clamping plates 202, which can not only clamp and fix the metal loading block 4, but also center and position the metal loading block 4.

[0036] Please see Figure 1 and Figure 3 In this embodiment, the displacement assembly includes a displacement seat 301 fixedly installed on the upper surface of the base 1, a first ball screw 302 rotatably installed in the displacement seat 301, and a first nut seat 303 threadedly installed on the first ball screw 302. Slide rails are provided on both sides of the displacement seat 301. The lower end of the first nut seat 303 is slidably connected to the displacement seat 301 through the slide rails, and the first nut seat 303 is fixedly connected to the lower end of the column 3. An adjusting handle is fixedly installed on the left end of the first ball screw 302 extending to the outside of the displacement seat 301. When the adjusting handle is rotated to drive the first ball screw 302 to rotate, the first nut seat 303 moves along the axial direction of the first ball screw 302.

[0037] It should be noted that by adjusting the rotation of the handle, the column 3 can be moved laterally along the displacement seat 301, thereby adjusting the distance between the wedge-shaped separating blade 8 and the support platform 2 to adapt to metal loading blocks 4 of different sizes. At the same time, during separation, it is convenient for the wedge-shaped separating blade 8 to fit onto the metal loading block 4.

[0038] Please see Figure 3 and Figure 5In this embodiment, the driving assembly includes a second ball screw 304 vertically mounted in the column 3 and a second nut seat 305 threaded onto the second ball screw 304. The upper end of the second ball screw 304 extends to the top of the column 3 and is fixedly mounted with a hand crank 306. The upper and lower ends of the second ball screw 304 are rotatably connected to the column 3, respectively. The second nut seat 305 is fixedly connected to the lifting seat 5. When the hand crank 306 is rotated to drive the second ball screw 304 to rotate, the second nut seat 305 moves along the axial direction of the second ball screw 304. When personnel are separating, by rotating the hand crank 306 to drive the second ball screw 304 to rotate, the second nut seat 305 can drive the lifting seat 5 to move in a lifting manner, thereby the wedge-shaped separating blade 8 cuts along the surface of the metal loading block 4 to separate the adhesive layer.

[0039] In this embodiment, a pressure sensor is provided between one end of the tool holder 7 and the lifting seat 5, and a built-in spring is provided in the pressure groove 6. The pressure sensor is used to sense the contact pressure between the tool tip and the loading block.

[0040] It should be noted that the pressure sensor is electrically connected to the digital display instrument, which can display the current separation force value in real time. The operator can control the rotation force of the hand crank 306 according to the preset safety threshold (such as not exceeding 500 N) to achieve "visual" separation process management. The built-in spring plays a pre-tightening and buffering role, absorbing impact energy in the initial contact stage and ensuring that the pressure sensor is always in the effective measurement range, thus extending its service life.

[0041] The working principle of the above embodiments is as follows:

[0042] First, the metal loading block 4 with foam fragments is vertically placed into the U-shaped groove of the support platform 2, so that its bottom contacts the elastic buffer pad 21. Then, by rotating the two handles, the threaded rod 201 is driven to clamp the front and rear ends of the loading block with the clamping plate 202, completing the positioning and fixing. Next, according to the actual position of the loading block, the adjusting handle is manually rotated to drive the first ball screw 302 to move the entire column 3 laterally until the wedge-shaped separating blade 8 is directly opposite the center of the adhesive layer at the bottom of the loading block, achieving precise fit. Then, the hand crank 306 is slowly rotated clockwise, which drives the lifting seat 5 to rise at a constant speed through the second ball screw 304, so that the wedge-shaped separating blade 8 is gradually inserted into the adhesive layer. During this process, the pressure sensor monitors the separation force in real time and displays it on the instrument. The operator can control the cutting speed accordingly to ensure that the load is within a safe range. As the wedge blade penetrates deeper, the adhesive layer is continuously opened under the "splitting-peeling" effect, and the residual foam material falls off as a whole into the chip collection tray 9 below. When the pressure value drops to zero and the separation seam is fully opened, it indicates that the separation is complete. At this point, turn the hand crank 306 counterclockwise to reset the lifting seat 5, release the limiting component, and then remove the clean metal loading block 4. When using it for the second time, the blade of the wedge-shaped separating knife 8 needs to be cleaned.

[0043] It should be noted that the control method of this utility model is controlled by a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. The power supply is also common knowledge in the field. Furthermore, this utility model is mainly used to protect mechanical devices, so the control method and circuit connection will not be explained in detail here.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for separating a specimen block from a loading block after a planar tensile test, comprising a base (1), a support platform (2) fixedly installed on one side of the upper end of the base (1), a column (3) disposed on the other side of the upper end of the base (1), and a metal loading block (4) installed inside the support platform (2), characterized in that: Limiting components are installed at both ends of the support platform (2). The limiting components are used to clamp and fix the metal loading block (4). The bottom of the column (3) is movably connected to the base (1) through the displacement component. The displacement component is used to adjust the lateral position of the column (3). A lifting seat (5) is slidably installed on the outer surface of the column (3). A driving component is provided on the inner side of the column (3). The driving component is used to drive the lifting seat (5) to move up and down. A pressure groove (6) is opened on the surface of the lifting seat (5). A knife holder (7) is installed in the pressure groove (6). A wedge-shaped separating knife (8) is installed at the other end of the knife holder (7). A bracket is fixedly installed on the bottom of the surface of the support platform (2). A chip collection tray (9) is provided on the bracket.

2. The device for separating the specimen block and the loading block after a planar tensile test according to claim 1, characterized in that: The upper end of the support platform (2) is U-shaped, and an elastic buffer pad (21) is provided at the bottom of the inner side of the support platform (2).

3. The device for separating the specimen block and the loading block after a planar tensile test according to claim 1, characterized in that: The limiting assembly includes a threaded rod (201) threaded on both sides of the upper end of the support platform (2), a handle fixedly installed on one end of the threaded rod (201), and a clamping plate (202) rotatably installed on the other end of the threaded rod (201). The clamping surface of the clamping plate (202) is provided with a rubber pad. When the handle is rotated to drive the threaded rod (201), the clamping plates (202) on both sides are attached to the front and rear ends of the metal loading block (4) to clamp and fix the metal loading block (4) in the support platform (2).

4. The device for separating the specimen block and the loading block after a planar tensile test according to claim 1, characterized in that: The displacement assembly includes a displacement seat (301) fixedly installed on the upper surface of the base (1), a first ball screw (302) rotatably installed in the displacement seat (301), and a first nut seat (303) threadedly installed on the first ball screw (302). The displacement seat (301) is provided with slide rails on both sides. The lower end of the first nut seat (303) is slidably connected to the displacement seat (301) through the slide rails, and the first nut seat (303) is fixedly connected to the lower end of the column (3). The left end of the first ball screw (302) extends to the outside of the displacement seat (301) and is fixedly installed with an adjustment handle. When the adjustment handle is rotated to drive the first ball screw (302) to rotate, the first nut seat (303) moves along the axial direction of the first ball screw (302).

5. The device for separating the specimen block and the loading block after a planar tensile test according to claim 1, characterized in that: The drive assembly includes a second ball screw (304) vertically mounted in the column (3) and a second nut seat (305) threaded onto the second ball screw (304). The upper end of the second ball screw (304) extends to the top of the column (3) and is fixedly mounted with a hand crank (306). The upper and lower ends of the second ball screw (304) are rotatably connected to the two ends of the column (3), respectively. The second nut seat (305) is fixedly connected to the lifting seat (5). When the hand crank (306) is rotated to drive the second ball screw (304) to rotate, the second nut seat (305) moves along the axial direction of the second ball screw (304).

6. The device for separating the specimen block and the loading block after a planar tensile test according to claim 1, characterized in that: A pressure sensor is provided between one end of the tool holder (7) and the lifting seat (5), and a built-in spring is provided in the pressure groove (6). The pressure sensor is used to sense the contact pressure between the tool tip and the loading block.

7. The device for separating the specimen block and the loading block after a planar tensile test according to claim 1, characterized in that: The chip collection tray (9) is located below the metal loading block (4) and is used to collect the detached foam fragments and adhesive chips.

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