Fixture for testing shearing performance of glass fiber reinforced plastic sample
By designing a fiberglass sample shear performance test fixture that links the moving components and uses the slider guide groove, the problems of low clamping efficiency and serious eccentricity of the clamping block in the prior art are solved, and efficient and accurate fixture adjustment and Test results.
Patent Information
- Application Number
- CN202420737877.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-04-11
AI Technical Summary
The existing fiberglass shear fixtures have low clamping efficiency, severe eccentricity of the clamps, and inaccurate clamping, which affects the test results.
A fiberglass sample shear performance test fixture was designed, using a method where only the second clamp can be moved, the moving components are set to a linkage state, and the linkage mechanism of screw, ball nut and pulley is used to achieve fast and accurate clamp adjustment. And the parallel movement of the second clamp is ensured through the design of the slider and the guide groove.
It improves clamping efficiency, avoids the problems of eccentricity and inaccurate clamping of the clamp, and ensures the accuracy and reliability of the test results.
Smart Images
Figure CN222481979U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of fixtures, and in particular relates to a fixture for testing the shearing performance of glass fiber reinforced plastic samples. Background Art
[0002] Glass fiber reinforced plastic (FRP) is also called GFRP, which means fiber reinforced plastic. It generally refers to reinforced plastics that use glass fiber to reinforce unsaturated polyester, epoxy resin and phenolic resin matrix, and use glass fiber or its products as reinforcement materials. It is called glass fiber reinforced plastics, or FRP. Due to the different types of resins used, there are polyester FRP, epoxy FRP, and phenolic FRP. FRP is light and hard, non-conductive, stable in performance, high in mechanical strength, less recycled, and corrosion-resistant.
[0003] The shear modulus of FRP is a physical quantity that describes the material's ability to resist deformation when subjected to shear force. It is an indicator that describes the stiffness of a material. Usually, FRP needs to be tested for shear force during the sample trial production stage. The test method is generally: clamp the two ends of the sample plate on two end fixtures, then fix the two end fixtures on the tensile machine, and pull the two end fixtures in opposite directions to test the shear force of the sample plate.
[0004] However, the existing end tooling has the following problems: first, the first clamping block and the second clamping block are both movable, the spacing adjustment speed is slow, and the clamping efficiency is low; second, all movable components need to be manually adjusted in sequence, which takes a long time, has low clamping efficiency, and causes differences in the adjustment range, serious eccentricity of the clamping block, and inaccurate clamping, which affects the test results. Utility Model Content
[0005] Therefore, the technical problem to be solved by the utility model is to overcome the defects of the current FRP shearing fixture, such as low clamping efficiency, serious eccentricity of the clamping block, inaccurate clamping, and ultimately affecting the test results.
[0006] In order to solve the above technical problems, the utility model provides a glass fiber reinforced plastic sample shear performance test fixture, including two end fixtures, each of which includes a positioning frame, a first clamping block, a second clamping block and a moving component;
[0007] The first clamping block is fixed on the positioning frame, and a plurality of moving components are fixed on the second clamping block. The plurality of moving components are arranged at intervals along the length direction of the second clamping block. The moving components include a consistent number of screw nut pairs, bearings and pulleys. A mounting hole is provided on the front side wall of the positioning frame, and a bearing is provided in the mounting hole. The screw is inserted into the inner ring of the bearing and is fixed to the inner ring. A ball nut is sleeved on the screw, and the ball nut is located in the positioning frame. The second clamping block is fixed to the ball nut. A knob is fixed on the outer end of the screw of the middle moving component, and a pulley is concentrically fixed on each screw, and a common endless belt is sleeved on every two adjacent pulleys.
[0008] A guide groove is provided on each of the two side surfaces inside the positioning frame, and a slider is provided at each end of the second clamping block. The slider can slide in the guide groove, and the top surface, bottom surface and inner surface of the slider are respectively in contact with the top surface, bottom surface and inner surface of the guide groove.
[0009] Preferably, the rear side walls of the positioning frame are each provided with a plurality of spaced through holes, the first clamping block is provided with a plurality of threaded blind holes, the same bolt is respectively inserted into the through holes and the threaded blind holes at corresponding positions, and the bolt is threadedly connected to the threaded blind holes.
[0010] Preferably, the first clamping block and the second clamping block are provided with mutually interlocking wavy grooves and protrusions on two opposite surfaces, the first clamping block has grooves and protrusions arranged alternately at intervals along its height direction, and the second clamping block has grooves and protrusions arranged alternately at intervals along its height direction.
[0011] The technical solution of the utility model has the following beneficial effects:
[0012] The utility model abandons the conventional method in which both the first clamping block and the second clamping block can be moved, and only the second clamping block can be moved relative to the first clamping block, so the clamping efficiency is high; a plurality of moving components are set to a linkage state, and when one of the moving components is adjusted, the other moving components will also start with the same property (moving the second clamping block in the same direction), avoiding the need to adjust all the moving components in sequence every time, saving time, and also avoiding the same movement amplitude of the moving components, ensuring the parallel movement of the clamping blocks, avoiding serious eccentricity, inaccurate clamping, and affecting the test results; a slider is provided on the second clamping block, and a guide groove is provided on the inner side wall of the positioning frame, and the slider and the guide groove are in contact on three sides, so the guiding effect is better, further ensuring the parallel movement of the second clamping block, avoiding eccentricity, and avoiding subsequent time-consuming adjustments. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0014] Figure 1 This is a schematic diagram of the positional relationship of the test fixture (two end fixtures) of the utility model when in use;
[0015] Figure 2 It is a three-dimensional schematic diagram of an end tooling of the utility model;
[0016] Figure 3 It is a three-dimensional cross-sectional view of an end tooling of the utility model;
[0017] Figure 4 It is a three-dimensional schematic diagram of the clamping surface of the first clamping block or the second clamping block of the utility model;
[0018] Figure 5 for Figure 4 A magnified schematic diagram of part A;
[0019] Explanation of the reference numerals: 1. end tooling; 11. positioning frame; 12. first clamping block; 13. second clamping block; 14. moving assembly; 141. screw-nut pair; 142. bearing; 143. pulley; 15. knob; 16. endless belt; 17. groove; 18. protrusion. DETAILED DESCRIPTION
[0020] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0023] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0024] The utility model provides a glass fiber reinforced plastic sample shear performance test fixture, including two end fixtures 1, each end fixture 1 includes a positioning frame 11, a first clamp block 12, a second clamp block 13 and a moving component 14, the first clamp block 12 and the second clamp block 13 are arranged inside the positioning frame 11, the positioning frame plays the role of installing and connecting the first clamp block 12 and the second clamp block 13, and also provides a guiding effect for the movement of the first clamp block 12 and / or the second clamp block 13 (the end of the first clamp block 12 and the end of the second clamp block 13 are both in contact with the wall surfaces on both sides of the interior of the positioning frame 11).
[0025] In order to improve the clamping force (clamping reliability) of the first clamp 12 and the second clamp 13 on the fiberglass sample, the roughness of the opposing surfaces of the first clamp 12 and the second clamp 13 is usually increased, thereby increasing the friction between the first clamp 12 and the fiberglass sample and the friction between the second clamp 13 and the fiberglass sample.
[0026] In the utility model, in order to improve the clamping convenience and clamping efficiency, firstly, the conventional method that both the first clamping block 12 and the second clamping block 13 are movable is abandoned, and the first clamping block 12 is set as a fixed component, and only the second clamping block 13 can move relative to the first clamping block 12; secondly, a plurality of moving components 14 are set to a linkage state, and when one of the moving components 14 is adjusted, the other moving components 14 will also start with the same property (moving the second clamping block 13 in the same direction), avoiding the need to adjust all the moving components 14 in sequence every time, saving time, and also avoiding the second clamping block 13 being unable to be parallel to the second clamping block after moving due to the fact that all the moving components 14 are manually operated, resulting in serious eccentricity, inaccurate clamping, and affecting the test results; thirdly, a slider is provided on the second clamping block 13, and a guide groove is provided on the inner side wall of the positioning frame 11, and the slider 18 and the guide groove are in contact on three sides, so the guiding effect is better, further ensuring the parallel movement of the second clamping block 13, avoiding eccentricity, and avoiding subsequent time-consuming adjustment.
[0027] The first clamping block 12 is fixed on the positioning frame 11, and a plurality of moving components 14 are fixed on the second clamping block 13. The plurality of moving components 14 are arranged at intervals along the length direction of the second clamping block 13. The moving components 14 include a consistent number of screw nut pairs 141, bearings 142 and pulleys 143. A mounting hole is provided on the front side wall of the positioning frame 11, and a bearing 142 is provided in the mounting hole. The screw is inserted into the inner ring of the bearing 142 and is fixed to the inner ring. A ball nut is sleeved on the screw, and the ball nut is located in the positioning frame 11. The second clamping block 13 is fixed to the ball nut. A knob 15 is fixed to the outer end of the screw of the middle moving component 14, and a pulley 143 is concentrically fixed on each screw, and a common annular belt 16 is sleeved on every two adjacent pulleys 143.
[0028] The method of using the end fixture 1 of the utility model is as follows: first, ensure that there is a large gap between the second clamp block 13 and the first clamp block 12, then extend the end of the glass fiber reinforced plastic sample into the gap between the first clamp block 12 and the second clamp block 13, and then manually rotate the knob 15 clockwise to make the middle screw rotate clockwise. At the same time, since the screw and the screws next to it are sleeved with an annular belt 16, the other screws can be driven to rotate. When the screw rotates, the ball nut on the screw moves toward the first clamp block 12, thereby driving the second clamp block 13 to move toward the first clamp block 12, thereby reducing the gap between the first clamp block 12 and the second clamp block 13, and clamping the end of the glass fiber reinforced plastic sample. In the utility model, as long as the knob 15 is manually rotated once, all ball nuts can be moved toward the first clamp block 12 at the same time and with the same stroke, which saves the time required to start all moving components 14 in sequence and ensures that the strokes of all moving components 14 are consistent.
[0029] A guide groove is provided on each of the two side surfaces inside the positioning frame 11, and a slider is provided on each of the two ends of the second clamping block 13. The slider can slide in the guide groove, and the top surface, bottom surface and inner surface of the slider are respectively fitted with the top surface, bottom surface and inner surface of the guide groove. The slider and the guide groove are fitted on three surfaces at the same time, and the guiding effect is better, which further ensures the parallel movement of the second clamping block 13, avoids eccentricity, and avoids the need to spend time to adjust the parallelism of the second clamping block 13 later.
[0030] In the utility model, the fixing method between the first clamping block 12 and the positioning frame 11 bracket is: a plurality of spaced through holes are respectively provided on the rear side walls of the positioning frame 11, and a plurality of threaded blind holes are provided on the first clamping block 12. The same bolt 21 is respectively inserted into the corresponding through holes and threaded blind holes, and the bolt is threadedly connected to the threaded blind holes.
[0031] In order to improve the roughness of the two opposing surfaces of the first clamp 12 and the second clamp 13 in the present invention, the two opposing surfaces of the first clamp 12 and the second clamp 13 are provided with mutually interlocking wavy grooves 17 and protrusions 18, thereby improving the clamping force of the first clamp 12 and the second clamp 13 on the glass fiber reinforced plastic sample. The grooves 17 and protrusions 18 arranged alternately along the height direction of the first clamp 12 and the grooves 17 and protrusions 18 arranged alternately along the height direction of the second clamp 13 further improve the clamping force of the first clamp 12 and the second clamp 13 on the glass fiber reinforced plastic sample.
[0032] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.
Claims
1. A fixture for testing the shear performance of a glass fiber reinforced plastic sample, comprising two end fixtures (1), each of the end fixtures (1) comprising a positioning frame (11), a first clamping block (12), a second clamping block (13) and a moving assembly (14), characterized in that: The first clamping block (12) is fixed on the positioning frame (11), and a plurality of moving assemblies (14) are fixed on the second clamping block (13). The plurality of moving assemblies (14) are arranged at intervals along the length direction of the second clamping block (13). The moving assemblies (14) include a consistent number of screw nut pairs (141), bearings (142) and pulleys (143). A mounting hole is provided on the front side wall of the positioning frame (11), and a bearing (142) is provided in the mounting hole. The screw is inserted into the inner ring of the bearing (142) and is fixed to the inner ring. A ball nut is sleeved on the screw and the ball nut is located in the positioning frame (11). The second clamping block (13) is fixed to the ball nut. A knob (15) is fixed to the outer end of the screw of the middle moving assembly (14). A pulley (143) is concentrically fixed to each screw, and a common endless belt (16) is sleeved on every two adjacent pulleys (143). A guide groove is provided on each of the two side surfaces inside the positioning frame (11), and a slider is provided at each end of the second clamping block (13). The slider can slide in the guide groove, and the top surface, bottom surface and inner surface of the slider are respectively in contact with the top surface, bottom surface and inner surface of the guide groove.
2. The glass fiber reinforced plastic sample shear performance test fixture according to claim 1, characterized in that: The rear side walls of the positioning frame (11) are each provided with a plurality of spaced through holes (19), and the first clamping block (12) is provided with a plurality of threaded blind holes (20). A same bolt (21) is respectively inserted into the through holes (19) and the threaded blind holes (20) at corresponding positions, and the bolt (21) is threadedly connected to the threaded blind holes (20).
3. The glass fiber reinforced plastic sample shear performance test fixture according to claim 1 or 2, characterized in that: Two opposing surfaces of the first clamping block (12) and the second clamping block (13) are provided with wavy grooves (17) and protrusions (18) that engage with each other; the first clamping block (12) is provided with grooves (17) and protrusions (18) that are alternately arranged at intervals along its height direction; and the second clamping block (13) is provided with grooves (17) and protrusions (18) that are alternately arranged at intervals along its height direction.