Device for calibrating lateral displacement of extensometer on axial extensometer calibrator

Abstract

The utility model discloses a device for realizing extensometer transverse displacement verification on an axial extensometer calibrator, which comprises two U-shaped brackets, namely an upper U-shaped bracket and a lower U-shaped bracket, the two U-shaped brackets have the same shape and size and are positioned on the same vertical plane, and the middle positions of the bottoms of the upper U-shaped bracket and the lower U-shaped bracket are fixedly connected with an upper connector and a lower connector of the calibrator respectively; supporting rods are detachably connected between the left side wall and the right side wall of the U-shaped support, and the two supporting rods are used for installing an upper arm knife edge and a lower arm knife edge of the extensometer. The device provided by the utility model can realize the accurate measurement of the transverse (radial) displacement of the extensometer.

Description

Technical Field

[0001] This utility model belongs to the technical field of extensometer calibration and measurement devices, and relates to a device for verifying the lateral displacement of an extensometer on an axial extensometer calibrator. Background Technology

[0002] With the development of the field of materials mechanics testing, transverse or radial strain information of materials during tension and compression is receiving increasing attention. Transverse strain can be used to calculate indicators such as area reduction, Poisson's ratio, true stress, true strain, volumetric strain, and anisotropic parameters. Therefore, some transverse extensometers and biaxial extensometers have emerged. However, there is a lack of specialized transverse displacement measurement devices in China, and existing axial extensometer calibrators lack suitable tooling for transverse installation. Currently, some newly invented auxiliary devices use extension rods to install extensometers, but the extensometer contact point is not on the same axis as the measuring device, resulting in large deflection and inability to guarantee vertical coaxiality, raising questions about measurement accuracy. Utility Model Content

[0003] The purpose of this invention is to provide a device for verifying the lateral displacement of an extensometer on an axial extensometer calibrator, which enables accurate measurement of the lateral (radial) displacement of the extensometer.

[0004] The technical solution adopted in this utility model is:

[0005] The device for verifying the lateral displacement of an extensometer on an axial extensometer calibrator includes two U-shaped supports, namely an upper U-shaped support and a lower U-shaped support. The two U-shaped supports are identical in shape and size and located on the same vertical plane. The bottom middle positions of the upper and lower U-shaped supports are respectively fixed to the upper and lower connectors of the calibrator. Support rods are detachably connected between the left and right side walls of the U-shaped supports. The two support rods are used to install the upper and lower arm blades of the extensometer.

[0006] The features of this utility model also include:

[0007] A fixed end is provided at the bottom center of the U-shaped bracket, and a fixing hole is provided on the fixed end. The two U-shaped brackets are rigidly connected to the upper connector and the lower connector respectively through the fixing hole.

[0008] The length from the opening to the bottom of the U-shaped bracket is 50mm to 150mm, and the distance between the two side walls of the U-shaped bracket is 40mm to 100mm.

[0009] The U-shaped bracket has first through holes on both sides. The support rod passes through the two first through holes and is connected to the U-shaped bracket. The U-shaped bracket also has positioning pin holes on both sides, which are perpendicular to and connected to the first through holes.

[0010] The minimum distance between the locating pin hole and the edge of the U-shaped bracket opening is 1mm.

[0011] The two ends of the support rod are cylindrical, and their diameter is the same as the diameter of the first through hole of the U-shaped bracket. The self-locking nut is threaded to both ends of the support rod to achieve detachable fixing of the support rod and the U-shaped bracket.

[0012] The support rod has a second through hole at both ends. The positioning screw passes through the positioning pin hole of the U-shaped bracket and the second through hole of the support rod in sequence and is then locked to achieve radial and longitudinal positioning and fixation of the support rod.

[0013] The upper and lower parts of the middle section of the support rod have two different structures, one half of which is a semi-cylindrical structure and the other half is a semi-rectangular structure.

[0014] The diameter of the support rod is 2mm~10mm, and its length is 20~100mm longer than the distance between the two side walls of the U-shaped bracket.

[0015] The beneficial effects of this utility model are:

[0016] (1) The U-shaped bracket and support rod in this utility model device are reasonably designed. The fixing holes at the ends of the upper and lower U-shaped brackets can be used to achieve positioning connection with the upper and lower connectors, ensuring that the upper and lower U-shaped brackets are in the same vertical plane. In addition, the upper and lower support rods are also in the same plane with the axis of the calibrator, ensuring that the calibrator is always in the same coaxial state when it moves and measures, thus realizing the efficient and accurate verification of the lateral displacement of the extensometer.

[0017] (2) The device of this utility model uses a U-shaped bracket with a large size and a long support rod, which can ensure a large enough space to install a transverse or biaxial extensometer. In addition, the first through hole of the U-shaped bracket has a small diameter and a small distance from the edge, which can realize the calibration and verification of the small gauge length extensometer.

[0018] (3) The U-shaped bracket and support rod are made of aerospace titanium alloy, which is lightweight, high-strength and corrosion-resistant, to avoid the overall device being too heavy and the surface is not easily scratched or bumped;

[0019] (4) The multifunctional support rod of this utility model device has a double contact surface structure, half of which is a plane and half of which is a curved surface, which can be adapted to the contact of extensometers with different blades (point contact or "V-type" contact).

[0020] (5) The U-shaped bracket of this utility model is provided with a first through hole and a positioning pin hole on both sides, and the two ends of the support rod are provided with external threads. The support rod is provided with a second through hole. The positioning of the U-shaped bracket and the stable rigid connection between the support rod and the U-shaped bracket can be realized through the self-locking nut and the positioning pin, ensuring that the plane of the support rod in contact with the extensometer is always perpendicular to the axis of the entire device, and also facilitating the switching of the two contact surfaces of the support rod at any time. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the structure of the device after it is connected to the calibrator.

[0022] Figure 2 This is a side view of the device after it has been connected with the extensometer and calibrator.

[0023] Figure 3 This is a schematic diagram showing the connection and cooperation between the U-shaped bracket and the support rod in the device of this utility model;

[0024] Figure 4 This is a schematic diagram of the support rod in the device of this utility model;

[0025] Figure 5 for Figure 4 Cross-sectional view of surface AA.

[0026] In the diagram, 1. Dial head, 2. Upper bracket, 3. Upper connector, 4. Upper U-shaped bracket, 5. Lower U-shaped bracket, 6. Lower connector, 7. Lower bracket, 8. Base, 9. First through hole, 10. Extensometer, 11. Fixing hole, 12. Self-locking nut, 13. Locating pin hole, 14. Support rod, 15. Fixed end, 16. Second through hole. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0028] Example 1:

[0029] This invention relates to a device for verifying the lateral displacement of an extensometer on an axial extensometer calibrator, the structure of which is as follows: Figure 1 and Figure 2 As shown, this is an auxiliary device connected to the calibrator for measuring the lateral displacement of the extensometer. It includes two U-shaped supports: an upper U-shaped support 4 and a lower U-shaped support 5. The two U-shaped supports are identical in shape and size and located on the same plane. The U-shaped supports have a U-shaped structure, with a fixed end 15 at the bottom. A fixing hole 11 is provided on the fixed end 15. The upper U-shaped support 4 is rigidly connected to the upper connector 3 of the calibrator through the fixing hole 11, and the lower U-shaped support 5 is rigidly connected to the lower connector 6 of the calibrator in the same manner.

[0030] The length from the opening to the bottom of the U-shaped bracket is 50mm~150mm (vertical installation height of the extensometer), and the distance between the two side walls of the U-shaped bracket is 40~100mm. It is suitable for installing extensometers with a transverse gauge length of less than 100mm.

[0031] like Figure 2 , Figure 3 and Figure 4As shown, the left and right side walls of the U-shaped bracket have first through holes 9. The support rod 14 passes through the two first through holes 9 and is fixed to the U-shaped bracket. The left and right side walls of the U-shaped bracket also have positioning pin holes 13, which are perpendicular to and connected to the first through holes 9.

[0032] The support rod 14 has cylindrical ends with the same diameter as the first through hole 9 of the U-shaped bracket. Self-locking nuts 12 are threaded to both ends of the support rod 14 to achieve rigid fixation between the support rod 14 and the U-shaped bracket. The support rod 14 also has second through holes 16 at both ends. Positioning pins pass through the positioning pin holes 13 and 16 of the U-shaped bracket in sequence and are then locked, achieving radial and longitudinal positioning and fixation of the support rod 14.

[0033] like Figure 4 and Figure 5 As shown, the upper and lower parts of the middle section of the support rod 14 have two different structures, one half being a semi-cylindrical structure and the other half a semi-rectangular structure. Figure 2 As shown, when the device of this utility model is in use, the middle part of the support rod 14 will contact the blade of the extensometer 10, that is, the middle part of the support rod 14 has a double contact surface structure, which is used to adapt to extensometers 10 with different blades and ensure that the blade of the extensometer is in close contact with the support rod 14.

[0034] The support rod 14 of this utility model device has a detachable structure. By removing the self-locking nut 12 and the positioning pin, the two contact surfaces of the support rod 14 can be quickly replaced. The second through hole 16 ensures that the contact surface of the support rod 14 is always perpendicular to the device axis. Furthermore, the support rod 14 can obviously be replaced by a single-shaped round bar or plate, or other contact shapes can be used according to customer requirements. Additionally, for higher coaxiality and precision, a device with a U-shaped bracket integrally formed with the support rod can be directly adopted.

[0035] The diameter of the support rod 14 is 2mm~10mm, and its length is 20~100mm longer than the distance between the two side walls of the U-shaped bracket.

[0036] The minimum distance between the positioning pin hole 13 of the U-shaped bracket and its opening edge is 1mm, which can realize the extensometer displacement measurement calibration with a minimum gauge length of 5mm.

[0037] Both the U-shaped bracket and the support rod 14 are made of aerospace titanium alloy, which combines lightweight, high strength and corrosion resistance.

[0038] Example 2:

[0039] Based on Embodiment 1, the installation process of this utility model device is as follows:

[0040] Step 1: Loosen the upper connector 3 of the calibrator to remove its original cutting head, adjust the angle, and rigidly connect the upper U-shaped bracket 4 to the upper connector 3 through the fixing hole 11. Then install the lower U-shaped bracket 5 in the same way, and make the upper and lower U-shaped brackets in the same vertical plane through the fixing hole 11 on the fixing end 15 of the U-shaped bracket.

[0041] Step 2: Insert the support rod 14 into the first through holes 9 on the left and right sides of the U-shaped bracket. Depending on the type of extensometer blade, rotate the support rod 14 to select either a rod-shaped or flat support. Pass the positioning pin through the positioning pin hole 13 of the U-shaped bracket and the second through hole 16 of the support rod 14 in sequence to achieve the positioning and initial fixation of the support rod 14.

[0042] Step 3: Screw the self-locking nut 12 into the threads at both ends of the support rod 14 to achieve a completely rigid fixation between the support rod 14 and the U-shaped bracket.

[0043] If the contact surface of the support rod 14 needs to be replaced, loosen the self-locking nuts 12 and positioning pins at both ends of the support rod 14, rotate the support rod 14 180°, and then install it according to steps 2 and 3.

[0044] Example 3:

[0045] Based on Example 2, to verify the feasibility of the device of this invention, a biaxial extensometer was connected to the Instron testing machine, such as... Figure 2 As shown, the lateral displacement of the extensometer was verified using an extensometer calibrator equipped with the device of this invention. The biaxial extensometer model has a lateral stroke of 0 to 0.5 mm and a "V-shaped" blade.

[0046] Step 1: Remove the original upper and lower cutter heads of the calibrator. Adjust the upper bracket 2 of the calibrator according to the lateral spacing of the extensometer 10 and the height of the upper U-shaped bracket 4 to obtain a suitable spacing. Connect the upper U-shaped bracket 4 to the upper connector 3 of the calibrator through the fixing hole 11, and connect the lower U-shaped bracket 5 to the lower connector 6 of the calibrator.

[0047] Step 2: Insert the support rod 14 into the two first through holes 9 of the upper U-shaped bracket 4, rotate the support rod 14 so that its cylindrical part is at the top, and install the positioning pin according to the positioning pin hole 13. Then install the self-locking nuts 12 at both ends of the support rod 14 to ensure that the support rod 14 is rigidly connected to the upper U-shaped bracket 4.

[0048] Step 3: Similarly, insert the other support rod 14 into the two first through holes 9 of the lower U-shaped bracket 5, rotate the support rod 14 so that its cylindrical part is at the bottom, and install the positioning pin according to the positioning pin hole 13. Then install the self-locking nuts 12 at both ends of the support rod 14 to confirm that the support rod 14 is rigidly connected to the lower U-shaped bracket 5.

[0049] Step 4: Use a right-angle ruler to manually check whether the upper U-shaped bracket 4 and the lower U-shaped bracket 5 of the device are located on the same vertical plane.

[0050] Step 5: Install the upper and lower arm blades of the extensometer 10 onto the upper and lower support rods 14, ensuring that the V-shaped blades are in close contact with the cylinder and that the installation is stable.

[0051] Step 6: Adjust the calibrator's ten-thousand-meter head 1 to put the extensometer 10 in the clamped state. Zero the reading of the extensometer on the testing machine and zero the calibrator as well. Start the measurement. After rotating the calibrator's ten-thousand-meter head 1 to move a certain displacement, record the reading of the extensometer 10 on the testing machine until the maximum stroke is 0.5 mm.

[0052] Step 7: Finally, summarize the test results and calculate the relative error between the calibrator reading and the extensometer reading.

[0053] The measurement error of the biaxial extensometer obtained in this embodiment under different lateral displacements is shown in Table 1. It can be seen that the relative error between the calibrator reading and the extensometer reading is controlled within 0.3%. Through the auxiliary device of this utility model, the lateral displacement measurement of the extensometer has been successfully realized.

[0054] Table 1 Measurement errors under different lateral displacements

[0055]

[0056] Example 4:

[0057] This embodiment describes a device for verifying the lateral displacement of an extensometer on an axial extensometer calibrator. It includes two U-shaped supports, namely an upper U-shaped support 4 and a lower U-shaped support 5. The two U-shaped supports have the same shape and size and are located on the same vertical plane. The bottom middle positions of the upper and lower U-shaped supports are respectively fixed to the upper and lower connectors of the calibrator. Support rods 14 are detachably connected between the left and right side walls of the U-shaped supports. The two support rods 14 are used to install the upper and lower arm blades of the extensometer 10.

[0058] A fixed end 15 is provided at the bottom middle position of the U-shaped bracket. A fixing hole 11 is provided on the fixed end 15. The two U-shaped brackets are rigidly connected to the upper connector 3 and the lower connector 6 respectively through the fixing hole 11.

[0059] Example 5:

[0060] This embodiment describes a device for verifying the lateral displacement of an extensometer on an axial extensometer calibrator. It includes two U-shaped supports, namely an upper U-shaped support 4 and a lower U-shaped support 5. The two U-shaped supports have the same shape and size and are located on the same vertical plane. The bottom middle positions of the upper and lower U-shaped supports are respectively fixed to the upper and lower connectors of the calibrator. Support rods 14 are detachably connected between the left and right side walls of the U-shaped supports. The two support rods 14 are used to install the upper and lower arm blades of the extensometer 10.

[0061] A fixed end 15 is provided at the bottom middle position of the U-shaped bracket. A fixing hole 11 is provided on the fixed end 15. The two U-shaped brackets are rigidly connected to the upper connector 3 and the lower connector 6 respectively through the fixing hole 11.

[0062] The length from the opening to the bottom of the U-shaped bracket is 50mm to 150mm, and the distance between the two side walls of the U-shaped bracket is 40mm to 100mm.

[0063] The U-shaped bracket has first through holes 9 on both sides. The support rod 14 passes through the two first through holes 9 and is connected to the U-shaped bracket. The U-shaped bracket also has positioning pin holes 13 on both sides. The positioning pin holes 13 are perpendicular to and connected to the first through holes 9.

[0064] Example 6:

[0065] This embodiment describes a device for verifying the lateral displacement of an extensometer on an axial extensometer calibrator. It includes two U-shaped supports, namely an upper U-shaped support 4 and a lower U-shaped support 5. The two U-shaped supports have the same shape and size and are located on the same vertical plane. The bottom middle positions of the upper and lower U-shaped supports are respectively fixed to the upper and lower connectors of the calibrator. Support rods 14 are detachably connected between the left and right side walls of the U-shaped supports. The two support rods 14 are used to install the upper and lower arm blades of the extensometer 10.

[0066] A fixed end 15 is provided at the bottom middle position of the U-shaped bracket. A fixing hole 11 is provided on the fixed end 15. The two U-shaped brackets are rigidly connected to the upper connector 3 and the lower connector 6 respectively through the fixing hole 11.

[0067] The length from the opening to the bottom of the U-shaped bracket is 50mm to 150mm, and the distance between the two side walls of the U-shaped bracket is 40mm to 100mm.

[0068] The U-shaped bracket has first through holes 9 on both sides. The support rod 14 passes through the two first through holes 9 and is connected to the U-shaped bracket. The U-shaped bracket also has positioning pin holes 13 on both sides. The positioning pin holes 13 are perpendicular to and connected to the first through holes 9.

[0069] The minimum distance between the positioning pin hole 13 and the edge of the U-shaped bracket opening is 1mm.

[0070] The two ends of the support rod 14 are cylindrical, and their diameter is the same as that of the first through hole 9 of the U-shaped bracket. The self-locking nut 12 is threaded to both ends of the support rod 14 to achieve detachable fixing of the support rod 14 and the U-shaped bracket.

[0071] The support rod 14 has second through holes 16 at both ends. The positioning screws pass through the positioning pin holes 13 of the U-shaped bracket and the second through holes 16 of the support rod 14 in sequence and are then locked, so as to realize the radial and longitudinal positioning and fixation of the support rod 14.

Claims

1. A device for verifying the lateral displacement of an extensometer on an axial extensometer calibrator, characterized in that, It includes two U-shaped brackets, namely an upper U-shaped bracket (4) and a lower U-shaped bracket (5). The two U-shaped brackets are the same in shape and size and are located on the same vertical plane. The bottom middle position of the upper and lower U-shaped brackets is fixed to the upper and lower connectors of the calibrator, respectively. The left and right side walls of the U-shaped brackets are detachably connected to support rods (14). The two support rods (14) are used to install the upper and lower arm blades of the extensometer (10).

2. The apparatus for verifying the lateral displacement of an extensometer on an axial extensometer calibrator according to claim 1, characterized in that, A fixed end (15) is provided at the bottom middle position of the U-shaped bracket. A fixing hole (11) is provided on the fixed end (15). The two U-shaped brackets are rigidly connected to the upper connector (3) and the lower connector (6) respectively through the fixing hole (11).

3. The apparatus for verifying the lateral displacement of an extensometer on an axial extensometer calibrator according to claim 1, characterized in that, The length from the opening to the bottom of the U-shaped bracket is 50mm to 150mm, and the distance between the two side walls of the U-shaped bracket is 40mm to 100mm.

4. The apparatus for verifying the lateral displacement of an extensometer on an axial extensometer calibrator according to claim 1, characterized in that, The U-shaped bracket has first through holes (9) on its left and right side walls. The support rod (14) passes through the two first through holes (9) and is connected to the U-shaped bracket. The U-shaped bracket also has positioning pin holes (13) on its left and right side walls. The positioning pin holes (13) are perpendicular to and connected to the first through holes (9).

5. The apparatus for verifying the lateral displacement of an extensometer on an axial extensometer calibrator according to claim 4, characterized in that, The minimum distance between the positioning pin hole (13) and the edge of the U-shaped bracket opening is 1mm.

6. The apparatus for verifying the lateral displacement of an extensometer on an axial extensometer calibrator according to claim 4, characterized in that, The two ends of the support rod (14) are cylindrical, and its diameter is the same as the diameter of the first through hole (9) of the U-shaped bracket. The self-locking nut (12) is threaded to both ends of the support rod (14) to achieve detachable fixing of the support rod (14) and the U-shaped bracket.

7. The apparatus for verifying the lateral displacement of an extensometer on an axial extensometer calibrator according to claim 4, characterized in that, The support rod (14) has a second through hole (16) at both ends. The positioning screw passes through the positioning pin hole (13) of the U-shaped bracket and the second through hole (16) of the support rod (14) in sequence and is then locked to achieve the radial and longitudinal positioning and fixation of the support rod (14).

8. The apparatus for verifying the lateral displacement of an extensometer on an axial extensometer calibrator according to claim 1, characterized in that, The upper and lower parts of the middle section of the support rod (14) have two different structures, one half of which is a semi-cylindrical structure and the other half is a semi-cubic structure.

9. The apparatus for verifying the lateral displacement of an extensometer on an axial extensometer calibrator according to claim 1, characterized in that, The diameter of the support rod (14) is 2mm~10mm, and its length is 20~100mm longer than the distance between the two side walls of the U-shaped bracket.

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