Angle measuring device for three-point bending test

Abstract

The utility model discloses an angle measuring device for a three-point bending test, which comprises a protractor and a bending angle measuring and fixing device, the bending angle measuring and fixing device comprises a fixing plate and fixing lugs, the fixing lugs are arranged on two sides of the upper part of the fixing plate, a force applying roller is fixedly arranged between the fixing lugs, and the force applying roller is fixedly connected with the protractor. The protractor is arranged on the lower portion of the fixing plate, the center point of the protractor corresponds to the center position of a tested sample, the protractor and the tested sample are arranged on the two sides of the fixing plate respectively, the tested sample is arranged on the lower side of the force application roller, and the angle of deformation of the tested sample is measured through the protractor. According to the angle measuring device, the deformation angle is measured in the test process, inaccurate measurement caused by material rebound after the test is avoided, the angle measuring device is not connected with the tested sample, and the situation that the tested sample is deformed and the test result is affected due to the fact that the angle measuring device generates force on the tested sample is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical property detection devices, in particular to an angle measuring device used for a three-point bending test. Background Art

[0002] When measuring the bending properties of materials, a three-point bending test is often used. The bending angle can be measured to determine the quality of the material. The bending angle of the material can be measured after the bending test and during the bending test. After the bending test, the material will rebound, resulting in inaccurate angle measurement.

[0003] The utility model patent with application number 202121467521.X discloses a bending angle measuring device for a three-point bending test. The device fixes the clamp to the specimen to be measured by bolts, so that the clamp can directly read the angle value during the test to enhance the measurement accuracy. However, since the device is a measuring device fixed on the specimen to be measured, it will interfere with the test during the test. For example, the specimen to be measured may be deformed due to the force exerted by its own weight on the specimen to be measured, thereby affecting the accuracy of the test. Summary of the invention

[0004] The utility model provides an angle measuring device for a three-point bending test to overcome the above technical problems.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] An angle measuring device for a three-point bending test, comprising a protractor and a bending angle measuring fixture, wherein the bending angle measuring fixture comprises a fixing plate and fixing ears, wherein the fixing ears are arranged on both sides of an upper portion of the fixing plate, and a force-applying roller is fixedly arranged between the fixing ears;

[0007] The protractor is arranged at the lower part of the fixing plate, the center point of the protractor corresponds to the center position of the tested sample, and the protractor and the tested sample are arranged at two sides of the fixing plate respectively.

[0008] Furthermore, it also includes two reading pointers, one end of which is hinged to the center point of the protractor.

[0009] Furthermore, it also includes a bending angle measuring device fixing bolt, a through hole is provided on the fixing ear, and two bending angle measuring device fixing bolts respectively pass through the through holes and are fixed with two sides of the force roller.

[0010] Furthermore, a slide rail is provided on the bending angle measuring fixture, and the protractor can move up and down along the slide rail.

[0011] Furthermore, it also includes a protractor fixing nut and a protractor fixing bolt, the protractor fixing bolt is arranged on the slide rail, the protractor fixing bolt passes through the center point of the protractor and the end of the reading pointer in sequence, and the protractor fixing nut and the protractor fixing bolt are fixed in cooperation.

[0012] Beneficial effect: The utility model discloses an angle measuring device for a three-point bending test, in which a force roller is fixed between fixed ears, a test sample is arranged on the lower side of the force roller, and the center point of the protractor is arranged at the center position of the test sample. When the test starts, the force roller applies downward pressure to deform the test sample, and the deformation angle of the test sample is measured by the protractor, so that the deformation angle can be measured during the test, and inaccurate measurement due to material rebound after the test is avoided. During the measurement process, the application is not connected to the test sample, so that the test sample is not deformed due to the force exerted by the angle measuring device itself on the test sample, thereby affecting the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments 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 structural diagram of a test sample without deformation when measuring with an angle measuring device for a three-point bending test disclosed in an embodiment of the utility model;

[0015] Figure 2 It is a structural schematic diagram of an angle measuring device for a three-point bending test disclosed in an embodiment of the utility model;

[0016] Figure 3 It is a structural schematic diagram of a test sample that produces a small deformation when measuring with an angle measuring device for a three-point bending test disclosed in an embodiment of the utility model;

[0017] Figure 4 It is a structural schematic diagram of a second viewing angle when a small deformation occurs to a test sample when an angle measuring device for a three-point bending test disclosed in an embodiment of the utility model is used for measurement;

[0018] Figure 5 It is a structural schematic diagram of a test sample that produces a large deformation when measuring with an angle measuring device for a three-point bending test disclosed in an embodiment of the utility model;

[0019] Figure 6 It is a schematic diagram of the connection relationship between the bending angle measuring fixture, the force-applying roller and the fixing bolt of the bending angle measuring fixture disclosed in the embodiment of the utility model;

[0020] In the figure: 1. test bench bottom plate; 2. supporting roller; 3. test sample; 4. reading pointer; 5. force roller; 6. bending angle measuring device fixing bolt; 7. protractor; 8. protractor fixing nut; 9. bending angle measuring fixture; 91. fixing plate; 92. fixing ear; 93. through hole; 10. slide rail; 11. protractor fixing bolt. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment 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.

[0022] This embodiment provides an angle measurement device for a three-point bending test. Figure 1-5 As shown, it includes a protractor 7 and a bending angle measuring fixture 9, the bending angle measuring fixture 9 includes a fixing plate 91 and fixing ears 92, the fixing ears 92 are arranged on both sides of the upper part of the fixing plate 91, and the force roller 5 is fixedly arranged between the fixing ears 92;

[0023] The protractor 7 is disposed at the lower part of the fixing plate 91 , the center point of the protractor 7 corresponds to the center position of the tested sample 3 , and the protractor 7 and the tested sample 3 are respectively disposed at two sides of the fixing plate 91 .

[0024] In this embodiment, the force roller 5 is first adjusted to a suitable height, and the test sample 3 is placed therein. The test sample 3 is arranged on the lower side of the force roller 5, and the test sample 3 is arranged on the upper side of the supporting roller 2. The supporting roller 2 is arranged on the upper side of the test bench bottom plate 1. Then, the bending angle measuring fixture 9 is fixed on the force roller 5, and then the height of the protractor 7 is adjusted so that the center point of the protractor 7 corresponds to the center position of the test sample 3. When the test starts, the force roller 5 applies pressure downward to deform the test sample 3, and the deformation angle of the test sample 3 is measured by the protractor 7, so that the deformation angle is measured during the test, thereby avoiding inaccurate measurement due to material rebound after the test. During the measurement process, the present application is not connected to the test sample 3, thereby avoiding deformation of the test sample due to the force exerted by the angle measuring device itself on the test sample, thereby affecting the test results.

[0025] The angle measuring device for a three-point bending test disclosed in this embodiment is small in size and easy to carry, making the measurement of the bending angle easier.

[0026] In a specific embodiment, two reading pointers 4 are further included, one end of which is hinged to the center point of the protractor 7. When the deformation of the test sample 3 is completed, the reading pointer 4 is rotated to make the angle of the reading pointer 4 consistent with the deformation angle of the test sample 3, and the accurate deformation angle is obtained according to the value on the dial of the protractor 7. The setting of the reading pointer 4 avoids inaccurate readings caused by estimation.

[0027] In a specific embodiment, it also includes a bending angle measuring device fixing bolt 6, and a through hole 93 is opened on the fixing ear 92. The two bending angle measuring device fixing bolts 6 respectively pass through the through holes 93 and are fixed with the two sides of the force roller 5. The bending angle measuring device fixing bolts 6 are used to fix the bending angle measuring fixing device 9 and the force roller 5, which is convenient for disassembly and assembly.

[0028] In a specific embodiment, Figure 6 As shown, a slide rail 10 is provided on the bending angle measuring fixture 9, and the protractor 7 can move up and down along the slide rail 10, so that its center can be kept at a corresponding position with the center of the test sample 3, thereby ensuring the measurement accuracy.

[0029] In a specific embodiment, it also includes a protractor fixing nut 8 and a protractor fixing bolt 11, the protractor fixing bolt 11 is arranged on the slide rail 10, the protractor fixing bolt 11 passes through the center point of the protractor 7 and the end of the reading pointer 4 in sequence, the protractor fixing nut 8 and the protractor fixing bolt 11 are matched and fixed, when the center of the protractor 7 is adjusted to the same as the center position of the tested sample 3, the protractor fixing bolt 11 and the protractor fixing nut 8 are tightened to achieve fixation, when the measurement is completed, the protractor fixing bolt 11 and the protractor fixing nut 8 are loosened, and the protractor 7 is moved to a position matching the next tested sample.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An angle measuring device for a three-point bending test, characterized in that: The invention comprises a protractor (7) and a bending angle measuring fixture (9), wherein the bending angle measuring fixture (9) comprises a fixing plate (91) and fixing ears (92), wherein the fixing ears (92) are arranged on both sides of the upper part of the fixing plate (91), and a force-applying roller (5) is fixedly arranged between the fixing ears (92); The protractor (7) is arranged at the lower part of the fixing plate (91), the center point of the protractor (7) corresponds to the center position of the tested sample (3), and the protractor (7) and the tested sample (3) are respectively arranged on both sides of the fixing plate (91).

2. The angle measuring device for three-point bending test according to claim 1, characterized in that: It also comprises two reading pointers (4), one end of each of which is hinged to the center point of the protractor (7).

3. The angle measuring device for three-point bending test according to claim 1, characterized in that: It also includes a bending angle measuring device fixing bolt (6), a through hole (93) is provided on the fixing ear (92), and two bending angle measuring device fixing bolts (6) respectively pass through the through holes (93) and are fixed with the two sides of the force roller (5).

4. The angle measuring device for three-point bending test according to claim 2, characterized in that: The bending angle measuring fixture (9) is provided with a slide rail (10), and the protractor (7) can move up and down along the slide rail (10).

5. The angle measuring device for three-point bending test according to claim 4, characterized in that: It also includes a protractor fixing nut (8) and a protractor fixing bolt (11), wherein the protractor fixing bolt (11) is arranged on the slide rail (10), and the protractor fixing bolt (11) passes through the center point of the protractor (7) and the end of the reading pointer (4) in sequence, and the protractor fixing nut (8) and the protractor fixing bolt (11) are matched and fixed.

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