Bending deflection measuring tool
By designing a bending deflection measurement tooling including a sleeve rod, a piston rod and a top cap, the problem of inaccurate sample variable measurement and limited use range of the extensometer is solved, achieving more accurate and extensive bending deflection measurement, and expanding The application range of extensometers.
Patent Information
- Application Number
- CN202420973476.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-05-07
AI Technical Summary
In the prior art, the measurement of the sample-type variable is inaccurate, and the extensometer can only be used to measure the degree of stretching in the vertical direction, the compression level cannot be measured, and the scope of use is limited.
A bending deflection measurement tool including a sleeve rod, a piston rod and a top cap is designed. The extensometer is fixed through the groove of the sleeve rod, and the piston rod measures the bending deflection displacement, and adapts to the deformation degree of different workpieces through springs and screws.
It achieves the accuracy and wide applicability of bending deflection measurement, expands the application scope of the extensometer, so that it can be used for testing in more fields, and the tooling has a simple structure, high quality, and is not easily damaged.
Smart Images
Figure CN222353466U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a bending deflection measuring tool, belonging to the technical field of testing devices. Background Art
[0002] When testing the bending of composite materials, the specimens are mostly tested for bending deflection at the midpoint of the span. The measurement results of bending deflection directly affect the results of bending modulus and bending strain, so the bending deflection is extremely demanding during testing. In the prior art, the deformation of the upper surface of the specimen is measured by the pressure head of the measuring equipment. However, since the upper surface of the specimen is under pressure, not only the deformation variable will be generated during the test, but also the elastic deformation variable caused by the compression of the specimen, so there will be a problem of inaccurate measurement.
[0003] In addition, the extensometer in the prior art can only be used to measure the degree of stretching in the vertical direction, but cannot measure the degree of compression, so the scope of use is limited.
[0004] Therefore, there is an urgent need in the art for a bending deflection measuring tool that can measure the lower surface type variables of a specimen and expand the application range of an extensometer. Summary of the invention
[0005] The utility model aims to solve the problems in the prior art that the measurement of sample type variables is inaccurate and the use range of the extensometer is limited.
[0006] In order to achieve the purpose of solving the above-mentioned problems, the technical solution adopted by the utility model is to provide a bending deflection measuring tool, including a sleeve rod, a circle of protrusions for fixing it on a fixture is provided in the middle of the outer part of the sleeve rod, and a groove for fixing an extensometer is provided on the upper outer surface of the sleeve rod; the sleeve rod is hollow inside and is provided with a piston rod for measuring the bending deflection displacement, a top cap is threadedly connected to the top of the piston rod, and a spring is provided at the bottom.
[0007] Preferably, the upper portion of the sleeve rod has a length of 27 mm and an outer diameter of 10 mm, a protrusion length of 2 mm and an outer diameter of 18 mm, and a lower portion length of 24 mm and an outer diameter of 12 mm.
[0008] Preferably, the piston rod is a solid round steel rod with a length of 25 mm and an outer diameter of 5 mm. One end of the piston rod is processed into a thread, and the other end is processed into a stopper with a diameter of 7 mm.
[0009] Preferably, a screw is provided at the lower tail of the sleeve rod. When measuring different workpieces, the screw can be removed and the spring in the sleeve rod can be replaced to adapt to the deformation degree of the workpiece.
[0010] Preferably, a plastic ring is provided at the connection between the sleeve rod and the piston rod to ensure that the piston rod and the sleeve rod are tightly connected.
[0011] Preferably, the top cap is composed of a steel semicircular cap and a round rod, with a total length of 12 mm, an outer diameter of the round rod of 10 mm, and a threaded hole is opened at the center below the top cap so as to be rotatably connected to the piston rod.
[0012] Compared with the prior art, the utility model has the following beneficial effects:
[0013] 1. The bending deflection measurement is more accurate and fully meets the standard requirements. This patented tooling is suitable for bending deflection tests of various materials and various standards, and has a wide range of applications;
[0014] 2. This tool can be portable, disassembled and installed, and is suitable for all kinds of fixtures;
[0015] 3. This patent expands the functions of contact extensometers, allowing them to be used in testing in more fields;
[0016] 4. This patented tooling has a simple structure, high quality and is not easy to damage. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is the structural diagram of the bending deflection measuring tool of the utility model, left: assembly diagram; right: exploded diagram;
[0018] Figure 2 This is a schematic diagram of the use of the bending deflection measuring tool of the utility model.
[0019] Figure numerals: 1, top cap; 2, plastic ferrule; 3, piston rod; 4, sleeve rod; 5, protrusion; 6, groove. DETAILED DESCRIPTION
[0020] In order to make the present invention more clearly understood, a preferred embodiment is described in detail with reference to the accompanying drawings as follows:
[0021] like Figure 1-2 As shown, the utility model provides a bending deflection measuring tool. Before use, the bending deflection measuring tool is first placed in the hole groove at the midpoint of the span of the bending fixture, and then the extensometer blade is clamped in the groove 6 on the sleeve rod 4, connected with a rubber band, and the protrusion 5 in the middle is fixed on the fixture, so that the extensometer is connected to the bending deflection measuring tool. After the bending test begins, press down the sample to be tested, and push its lower surface above the top cap 1. When moving downward, the displacement measured by the extensometer of the piston rod 3 is the bending deflection. A plastic ring 2 is provided at the connection between the sleeve rod 4 and the piston rod 3 to ensure that the piston rod and the sleeve rod are tightly connected.
[0022] The above is only a preferred embodiment of the utility model, and is not any formal or substantial limitation of the utility model. It should be pointed out that ordinary technicians in this technical field can make some improvements and supplements without departing from the utility model, and these improvements and supplements should also be regarded as the protection scope of the utility model. Any technician familiar with this profession can make some changes, modifications and equivalent changes made by using the technical content disclosed above without departing from the spirit and scope of the utility model, which are all equivalent embodiments of the utility model; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the utility model are still within the scope of the technical solution of the utility model.
Claims
1. A bending deflection measuring tool, characterized in that: It includes a sleeve rod, a circle of protrusions for fixing it on a fixture is provided in the middle of the sleeve rod, and a groove for fixing the extensometer is provided on the upper outer surface of the sleeve rod; the sleeve rod is hollow inside and is provided with a piston rod for measuring bending deflection displacement, a top cap is threaded above the piston rod, and a spring is provided below.
2. The bending deflection measuring tool as claimed in claim 1, characterized in that: The upper part of the sleeve rod has a length of 27 mm and an outer diameter of 10 mm, a protrusion length of 2 mm and an outer diameter of 18 mm, and a lower part length of 24 mm and an outer diameter of 12 mm.
3. The bending deflection measuring tool as claimed in claim 1, characterized in that: The piston rod is a solid round steel rod with a length of 25 mm and an outer diameter of 5 mm. One end of the piston rod is processed into a threaded hole, and the other end is processed into a stopper with a diameter of 7 mm.
4. The bending deflection measuring tool as claimed in claim 1, characterized in that: A screw is arranged at the tail of the sleeve rod. When measuring different workpieces, the screw can be removed and the spring in the sleeve rod can be replaced to adapt to the deformation degree of the workpiece.
5. The bending deflection measuring tool as claimed in claim 1, characterized in that: A plastic ring is provided at the connection between the sleeve rod and the piston rod to ensure that the piston rod and the sleeve rod are tightly connected.
6. The bending deflection measuring tool as claimed in claim 1, characterized in that: The top cap is composed of a steel semicircular cap and a round rod, with a total length of 12 mm, an outer diameter of the round rod of 10 mm, and a threaded hole is opened at the center of the bottom of the top cap so as to be rotatably connected with the piston rod.