Bending test device
By designing a bending test device with adjustable spacing pressing components and limiting ring components, the problems of poor versatility and uneven stress of existing devices are solved, and accurate bending detection of the R region of composite materials of different specifications is realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2026-03-10
AI Technical Summary
Existing devices for detecting the degree of bending in the R-zone of composite materials have poor versatility, cannot adapt to the R-zone of composite materials of different specifications, and are subjected to uneven stress during bending, resulting in low accuracy of the detection data.
A bending test device was designed, including two adjustable-gap pressing components and a limiting ring component. The pressing mechanism moves the pressing components closer or further apart to clamp composite materials of different thicknesses and lengths. Four pressure rollers are used to achieve a four-point bending test to ensure uniform distribution of bending moment.
The versatility of the bending test device has been improved, enabling it to adapt to different specifications of composite materials in the R region, and ensuring the accuracy of the test data through uniform stress.
Smart Images
Figure CN223985965U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of material performance testing technology, and in particular to a bending test device. Background Technology
[0002] With the widespread application of composite materials in the aerospace and civil aviation fields, the R-zone of composite materials is a crucial connection and geometric transition zone in composite material structures, playing a role in load-bearing and force transmission. Therefore, the number of testing items for the R-zone is gradually increasing to ensure the stability of the composite material R-zone structure. Bending tests are one such testing item for composite material R-zones. Existing devices for detecting the bending degree of composite material R-zones can only test R-zones of fixed specifications. For R-zones with larger thicknesses or lengths, separate bending devices need to be designed to perform bending tests. Therefore, existing devices for detecting the bending degree of composite material R-zones have poor versatility and cannot perform bending tests on R-zones of various specifications. Furthermore, existing devices for detecting the bending degree of composite material R-zones suffer from uneven stress during bending, resulting in relatively low accuracy of the test data.
[0003] Therefore, there is an urgent need for a bending test device to solve the above-mentioned technical problems. Utility Model Content
[0004] The purpose of this invention is to provide a bending test device that can solve the problems of poor versatility of existing devices for detecting the bending degree of the R region of composite materials, which cannot perform bending tests on the R region of composite materials of various specifications, and the relatively low accuracy of the test data obtained due to the uneven stress on the composite material during the bending process.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] A bending test apparatus, comprising:
[0007] Two pressing assemblies facing each other along a first direction, one pressing assembly connected to a pressing mechanism, and the other pressing assembly fixed to a worktable. Each pressing assembly includes a connecting plate and two pressing parts, which are spaced apart on the connecting plate along a second direction. The spacing between the two pressing parts is adjustable. Each pressing part includes a mounting part and a pressure roller. The mounting part includes two lugs facing each other along a third direction, and the pressure roller is connected between the two lugs. The composite material is clamped between the pressure rollers of the two pressing assemblies.
[0008] A limiting ring assembly is placed on the pressure roller of the pressing assembly, which is fixed to the worktable surface, and the limiting ring assembly is configured to fix the composite material.
[0009] As a preferred technical solution for the bending test device, the connecting plate is provided with at least two strip holes, the two strip holes are spaced apart along the third direction, both strip holes are parallel to the second direction, the mounting component is provided with corresponding mounting holes, and the strip holes and the mounting holes are connected by fasteners.
[0010] As a preferred technical solution for the bending test device, the connecting plate has two spaced scale segments on the side wall opposite to the lug, the two scale segments are correspondingly arranged with the two pressing parts, and the lug is provided with a 0 scale line.
[0011] As a preferred technical solution for the bending test device, the connecting plate is provided with a first guide portion, and the mounting component is provided with a corresponding second guide portion. When the spacing between the two pressing components is adjusted, the second guide portion can move along the first guide portion.
[0012] As a preferred technical solution for the bending test device, one of the first guide part and the second guide part is a guide groove and the other is a protruding column.
[0013] As a preferred technical solution for the bending test device, the pressure roller is rotatably connected between the two lugs.
[0014] As a preferred technical solution for the bending test device, the two lugs are provided with two opposite mounting holes. The bending test device includes bearings, and each mounting hole corresponds to a bearing. The outer ring of the bearing is placed inside the mounting hole, and both ends of the pressure roller are placed inside the inner ring of the bearing.
[0015] As a preferred technical solution for the bending test device, the pressure roller includes connecting sections at both ends and a working section in the middle. The connecting sections are placed in the inner ring of the bearing, and the working section is pressed against the composite material. The diameter of the working section is smaller than the diameter of the connecting sections, and the pressure roller is detachably connected to the bearing.
[0016] As a preferred technical solution for the bending test device, the two pressing components are nested together.
[0017] As a preferred technical solution for the bending test device, the limiting ring assembly includes four limiting rings. Each pressure roller is provided with two limiting rings. The two limiting rings are respectively disposed at both ends of the composite material along a third direction and are in contact with the two side walls of the composite material to fix the composite material.
[0018] Compared with the prior art, the bending test device provided by this utility model has the following technical advantages:
[0019] 1. By setting two pressing components opposite each other along the first direction, one pressing component is connected to the pressing mechanism, and the other pressing component is fixed to the worktable. The composite material is clamped between the two pressing components. By operating the pressing mechanism, the two pressing components can be moved closer or further apart. The bending test device can clamp composite materials of different thicknesses. The pressing component includes two pressing parts with adjustable spacing, which enables the bending test device to clamp composite materials of different lengths. This allows the bending test device to perform bending tests on the R-zone of composite materials of different specifications, thus improving the versatility of the bending test device.
[0020] 2. Since each pressing assembly includes two pressing parts, each pressing part includes a mounting part and a pressure roller. The mounting part includes two lugs opposite each other along a third direction. The pressure roller is connected between the two lugs. The composite material is clamped between the pressure rollers of the two pressing assemblies. In this way, the pressure roller can press perpendicularly to the composite material. At the same time, the four pressure rollers in the two pressing assemblies press with four points on the surface of the composite material, realizing a four-point bending test on the R-zone of the composite material. This ensures that the R-zone of the composite material can reach the maximum bending force before bending fracture, and that the bending moment is evenly distributed, thus ensuring the accuracy of the bending test data of the R-zone of the composite material. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the bending test device provided by this utility model;
[0022] Figure 2 This is an exploded schematic diagram of the bending test device provided by this utility model.
[0023] In the picture:
[0024] 100. Composite materials;
[0025] 1. Pressing assembly; 11. Connecting plate; 111. Strip hole; 112. Scale section; 113. First guide section; 12. Pressing component; 121. Mounting component; 1211. Lug; 1212. Mounting hole; 1213. Second guide section; 122. Pressure roller;
[0026] 2. Limiting ring; 3. Bearing; 4. Fastener. Detailed Implementation
[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0030] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0031] like Figure 1 and Figure 2As shown in the figure, this embodiment provides a bending test device for bending detection of the R-zone of composite material 100. The bending test device includes two pressing components 1 and a limiting ring assembly that are opposite each other along a first direction. One pressing component 1 is connected to a pressing mechanism, and the other pressing component 1 is fixed to a worktable. The pressing mechanism can drive the pressing component 1 connected to it to move up and down, so that the two pressing components 1 move closer or further apart. The pressing component 1 includes a connecting plate 11 and two pressing parts 12. The two pressing parts 12 are spaced apart on the connecting plate 11 along a second direction. The distance between the two pressing parts 12 is adjustable. The composite material 100 is clamped between the two pressing components 1. The adjustable distance between the pressing parts 12 in the pressing component 1 can clamp composite materials 100 of different lengths. At the same time, the two pressing components 1 can move closer or further apart, and can clamp composite materials 100 of different thicknesses. The pressing component 12 includes a mounting component 121 and a pressure roller 122. The mounting component 121 includes two lugs 1211 facing each other along a third direction. The pressure roller 122 is connected between the two lugs 1211. The composite material 100 is clamped between the pressure rollers 122 of the two pressing components 1, so that the pressure roller 122 can be pressed perpendicularly to the composite material 100. At the same time, the four pressure rollers 122 of the two pressing components 1 press against four points on the surface of the composite material 100, realizing a four-point bending test on the R-zone of the composite material 100. This ensures that the composite material 100 reaches the maximum bending force before bending fracture, and the bending moment is evenly distributed, ensuring the accuracy of the bending test data of the composite material 100. The limiting ring assembly is placed on the pressure roller 122 of the pressing component 1, which is fixed to the worktable, and is configured to fix the composite material 100. The setting of the limiting ring assembly can prevent the composite material 100 from falling off during the stress process, ensuring the stability of the bending test. In this embodiment, the first direction is the direction of the Z-axis, the second direction is the direction of the X-axis, and the third direction is the direction of the Y-axis.
[0032] The bending test device provided in this embodiment has two pressing components 1 facing each other along a first direction. One pressing component 1 is connected to the pressing mechanism, and the other pressing component 1 is fixed to the worktable. The composite material 100 is clamped between the two pressing components 1. By operating the pressing mechanism, the two pressing components 1 can be moved closer or further apart. The bending test device can clamp composite materials 100 of different thicknesses. The pressing component 1 includes two pressing parts 12 with adjustable spacing, so that the bending test device can clamp composite materials 100 of different lengths. This enables the bending test device to perform bending tests on the R-zone of composite materials 100 of different specifications, thus improving the versatility of the bending test device. Since each pressing assembly 1 includes two pressing parts 12, each pressing part 12 includes a mounting part 121 and a pressure roller 122. The mounting part 121 includes two lugs 1211 opposite each other along a third direction. The pressure roller 122 is connected between the two lugs 1211. The composite material 100 is clamped between the pressure rollers 122 of the two pressing assemblies 1. Thus, the pressure roller 122 can be pressed perpendicularly to the composite material 100. At the same time, the four pressure rollers 122 in the two pressing assemblies 1 are pressed at four points on the surface of the composite material 100, so that the R-zone of the composite material 100 can be subjected to a four-point bending test. This ensures that the composite material 100 can reach the maximum bending force before bending fracture, and the bending moment is evenly distributed, thus ensuring the accuracy of the bending test data of the composite material 100.
[0033] In this embodiment, the pressing mechanism can be a lifting platform, and the output end of the lifting platform is fixedly connected to a pressing assembly 1. The output end of the lifting platform can be fixedly connected to the pressing assembly 1 by bolts, or alternatively, the output end of the lifting platform and the pressing assembly 1 can be welded together. No specific restrictions are placed on the connection method between the lifting platform and the pressing assembly 1.
[0034] Furthermore, when installing the composite material 100, the position of the pressing component 12 in the two pressing components 1 can be adjusted according to the length of the composite material 100 to ensure that the pressure rollers 122 in the two pressing components 1 can press onto the composite material 100. Then, the pressing mechanism is operated to make the pressing component 1 located above move closer to the pressing component 1 fixed to the workbench surface, so that the R area of the composite material 100 gradually bends until it breaks, and the bending test data of the composite material 100 is obtained.
[0035] For example, the connecting plate 11 has at least two strip holes 111, which are spaced apart along a third direction and are parallel to a second direction. The mounting member 121 has corresponding mounting holes 1212. The strip holes 111 and the mounting holes 1212 are connected by fasteners 4. By assembling the mounting holes 1212 and the strip holes 111 at different positions using fasteners 4, the spacing between the two pressing members 12 in the pressing assembly 1 can be adjusted. In this embodiment, bolts can be used as fasteners 4.
[0036] Furthermore, two spaced scale segments 112 are provided on the side wall opposite to the lug 1211 in the connecting plate 11. The two scale segments 112 are correspondingly arranged with the two pressing parts 12. The lug 1211 is provided with a 0 scale line. By aligning the 0 scale line on the lug 1211 with different scales on the scale segments 112, the interval between the two pressing parts 12 can be accurately adjusted, so that the pressure rollers 122 in the two pressing parts 12 are symmetrically pressed onto the R area of the composite material 100, further improving the balance of force when the R area of the composite material 100 is bent and improving the accuracy of bending detection data.
[0037] Furthermore, a first guide portion 113 is provided on the connecting plate 11, and a corresponding second guide portion 1213 is provided on the mounting member 121. When adjusting the spacing between the two pressing members 12, the second guide portion 1213 can move along the first guide portion 113, avoiding the installation deviation of the pressing members 12 when adjusting them relative to the connecting plate 11, which would affect the determination of the spacing between the two pressing members 12. This allows for quick adjustment of the distance between the two pressing members 12 while ensuring accurate spacing. Specifically, one of the first guide portion 113 and the second guide portion 1213 is a guide groove, and the other is a protruding post. In this embodiment, the guide groove is provided on the side of the connecting plate 11 facing the pressing member 12. The pressing member 12 includes an intermediate plate, and two lugs 1211 are respectively provided at both ends of the intermediate plate along a third direction. A protruding post is provided on the side of the intermediate plate facing the connecting plate 11, and the protruding post is placed in the guide groove. In this embodiment, the protruding post and the pressing member 12 are integrally formed, further improving the stability of the pressing member 12 structure.
[0038] In this embodiment, the pressure roller 122 is rotatably connected between two lugs 1211. When the pressing mechanism is driven to bring the two opposing pressing components 1 closer to each other, as the pressing component 1 connected to the pressing mechanism moves closer to the other pressing component 1, the pressure roller 122 and the composite material 100 will rotate during the pressing process. This reduces the friction between the pressure roller 122 and the composite material 100 during the process of the two pressing components 1 approaching each other, reduces the interference of other external loads on the composite material 100, and further improves the accuracy of the bending test data of the composite material 100.
[0039] For example, the two lugs 1211 are provided with two opposite mounting holes. The bending test device also includes a bearing 3. Each mounting hole is provided with a bearing 3. The outer ring of the bearing 3 is placed in the mounting hole. Both ends of the pressure roller 122 are placed in the inner ring of the bearing 3. In this way, the pressure roller 122 connected between the two lugs 1211 can be made to rotate.
[0040] Furthermore, the pressure roller 122 includes connecting sections at both ends and a working section in the middle. The connecting sections are placed inside the bearing 3, and the working section is pressed against the composite material 100. The diameter of the working section is smaller than the diameter of the connecting sections, and the pressure roller 122 and the bearing 3 can be detachably connected. Thus, for different specifications of pressure rollers 122, the diameter of the connecting section can be a fixed value matching the inner ring of the bearing 3, and the diameter of the working section can be changed. When changing pressure rollers 122 of different specifications, the operator does not need to change the bearing 3 of different specifications to achieve the replacement of pressure rollers 122 with different diameters, reducing the difficulty of changing pressure rollers 122. In this embodiment, there are four types of pressure rollers 122, with working section diameters of 10mm, 18mm, 20mm, and 25mm, respectively. Preferably, the pressure roller 122 needs to undergo quenching treatment to ensure its rigidity.
[0041] Preferably, the two pressing components 1 are nested together. When the pressing mechanism drives the pressing component 1 connected to it to move, the two pressing components 1 can move without interference, improving the rationality of the bending test device's structural design. Specifically, the pressing component 1 fixedly connected to the worktable is called the lower pressing component, and the pressing component 1 connected to the pressing mechanism is called the upper pressing component. The distance between the two lugs 1211 of the pressing part 12 in the lower pressing component is A, the distance between the two lugs 1211 of the pressing part 12 in the upper pressing component is B, and the thickness of the lugs 1211 in the upper pressing component is C. In this embodiment, A = B + 2C, thus realizing the nesting of the two pressing components 1.
[0042] For example, the limiting ring assembly includes four limiting rings 2. Each pressure roller 122 in the pressing assembly 1 equipped with the limiting ring assembly has two corresponding limiting rings 2. The two limiting rings 2 are respectively disposed at both ends of the composite material 100 along a third direction and are in contact with the two side walls of the composite material 100 to clamp and fix the composite material 100, thereby preventing the composite material 100 from falling off during bending tests. Specifically, the limiting ring 2 includes two half-rings and bolts. The two half-rings have corresponding fixing holes. The bolts and fixing holes are locked together by threaded connection to lock the limiting ring 2 onto the pressure roller 122, thereby fixing the composite material 100. The limiting ring 2 is a conventional part in the mechanical field and will not be described in detail here.
[0043] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A bending test device characterized by comprising: The utility model relates to a composite material bending test device, including: Two crimping assemblies (1) opposite along the first direction, one crimping assembly (1) is connected with the pressure equipment, another crimping assembly (1) is fixed to the worktop, the crimping assembly (1) includes the connecting plate (11) and two pressure equipment (12), two pressure equipment (12) are spaced apart in the connecting plate (11) along the second direction, the interval of two pressure equipment (12) can be adjusted, the pressure equipment (12) includes the mounting piece (121) and the pressure roller (122), the mounting piece (121) includes two lugs (1211) opposite along the third direction, the pressure roller (122) is connected between two lugs (1211), and the composite material (100) is clamped between the pressure roller (122) in two crimping assemblies (1); Limiting ring assembly is arranged on the pressure roller (122) of the crimping assembly (1) fixed to the worktop, and the limiting ring assembly is configured to fix the composite material (100).
2. The bend testing apparatus of claim 1, wherein The connecting plate (11) is provided with at least two strip-shaped holes (111) spaced apart along the third direction, and the strip-shaped holes (111) are parallel to the second direction, and the mounting piece (121) is provided with a mounting hole (1212) corresponding to the strip-shaped hole (111), and the strip-shaped hole (111) and the mounting hole (1212) are connected by a fastener (4).
3. The bend testing apparatus of claim 1, wherein Two scale sections (112) are arranged on the side wall of the connecting plate (11) opposite to the lug (1211), and the scale sections (112) are arranged corresponding to the two pressure equipment (12), and the lug (1211) is provided with a 0 scale line corresponding to the lug (1211).
4. The bend testing apparatus of claim 3, wherein A first guide part (113) is arranged on the connecting plate (11), and a second guide part (1213) is arranged on the mounting piece (121) corresponding to the first guide part (113), and when the spacing of the two pressure equipment (12) is adjusted, the second guide part (1213) can move along the first guide part (113).
5. The bend testing apparatus of claim 4, wherein, One of the first guide part (113) and the second guide part (1213) is a guide groove, and the other is a protruding column.
6. The bend testing apparatus of claim 1, wherein The pressure roller (122) is rotatably connected between the two lugs (1211).
7. The bend testing apparatus of claim 6, wherein Two opposite assembly holes are arranged on the two lugs (1211), and the bending test device comprises a bearing (3), one bearing (3) is arranged in each assembly hole, the outer ring of the bearing (3) is arranged in the assembly hole, and the two ends of the pressure roller (122) are arranged in the inner ring of the bearing (3).
8. The bend testing apparatus of claim 7, wherein, The pressure roller (122) comprises a connecting section at both ends and a working section in the middle, the connecting section is arranged in the inner ring of the bearing (3), the working section is pressed with the composite material (100), the diameter of the working section is smaller than that of the connecting section, and the pressure roller (122) is detachably connected with the bearing (3).
9. The bend testing apparatus of claim 1, wherein, The two crimping assemblies (1) are nested with each other.
10. The bend testing apparatus of claim 1, wherein The limiting ring assembly comprises four limiting rings (2), two limiting rings (2) are arranged at two ends of the composite material (100) along the third direction and are attached to two side walls of the composite material (100) to fix the composite material (100).