A fixture for creep machine grating ruler calibration

Abstract

This application relates to a fixture for calibrating a grating ruler in a creep testing machine, comprising: a first clamping member with a first mounting hole, into which an extensometer calibrator is fitted; a second clamping member with a second mounting hole, into which a grating ruler is fitted; and a connecting member with its two ends connected to the first and second clamping members respectively, so that the extensometer calibrator and the measuring axis of the grating ruler are coaxially opposite each other. The two ends of the connecting member are fixed to the first and second clamping members respectively, thus ensuring that the first and second clamping members maintain a fixed relative position; the extensometer calibrator is mounted to the first clamping member through the first mounting hole, and the grating ruler is mounted to the second clamping member through the second mounting hole, thus ensuring that the extensometer calibrator and the grating ruler are stably positioned and coaxially opposite each other, effectively meeting the calibration and verification requirements of the grating ruler in a creep testing machine, and providing support for the efficiency of the calibration process and the accuracy of the results.

Description

Technical Field

[0001] This application relates to the field of metrology and testing technology, and in particular to a fixture for calibrating a creep machine grating ruler. Background Technology

[0002] Creep testing machines are used to determine the long-term deformation behavior of materials under constant load and temperature. The accurate measurement of the deformation usually depends on the grating ruler. Therefore, the regular calibration of the grating ruler is crucial. The extensometer calibrator, as a high-precision instrument for generating standard displacement, is a commonly used standard device for calibrating the grating ruler.

[0003] However, due to the limitations of the creep testing machine's spatial layout and the stability requirements for the installation and fixing of the grating ruler, if there is a lack of suitable special tooling to assist in the installation and positioning of the extensometer calibrator, not only will the efficiency of the grating ruler calibration operation be significantly reduced, but it will also be difficult to guarantee the accuracy of the calibration results, thereby affecting the reliability of subsequent value transfer. Utility Model Content

[0004] This application provides a fixture for calibrating the grating ruler of a creep testing machine, which can effectively meet the calibration, verification and periodic inspection requirements of the grating ruler of the creep testing machine, provide support for the efficiency of the calibration process and the accuracy of the results, and ensure the reliability of subsequent value transfer.

[0005] Therefore, this application provides a fixture for calibrating a creep machine grating ruler, comprising: The first clamp has a first mounting hole, and the extensometer calibrator is fitted into the first mounting hole. The second clamp is provided with a second mounting hole, and the grating ruler is fitted into the second mounting hole; A connector, the two ends of which are respectively connected to the first clamp and the second clamp, so that the extensometer calibrator and the measuring axis of the grating ruler are coaxially opposite each other.

[0006] As a preferred embodiment, the first clamp is provided with a deformation gap, and the deformation gap is connected to the first mounting hole.

[0007] As a preferred embodiment, the first clamp is further provided with a first locking hole, which extends laterally through both sides of the deformation gap, and a first locking element is provided in the first locking hole to lock and fix the extensometer calibrator sleeved in the first mounting hole.

[0008] As a preferred embodiment, the second clamp includes a first clamp and a second clamp; the first clamp and the second clamp together form the second mounting hole.

[0009] As a preferred embodiment, the first sleeve and the second sleeve are provided with at least one pair of second locking holes, and each second locking hole is provided with a second locking member to lock and fix the grating ruler sleeved in the second mounting hole.

[0010] As a preferred embodiment, the first sleeve is provided with a first threaded opening, and the first clamp is provided with a second threaded opening; The two ends of the connector are threaded to the first threaded opening and the second threaded opening, respectively.

[0011] As a preferred embodiment, an adjusting nut is also included, which is connected to the connector and used to fine-tune the relative distance between the first clamp and the second clamp.

[0012] As a preferred embodiment, a rubber ring is also included, which is sleeved on the second locking member and located between the mating surfaces of the first clamp and the second clamp.

[0013] As a preferred embodiment, a grating ruler sleeve is also fitted inside the second mounting hole.

[0014] The beneficial effects of this application are: The fixture for calibrating a grating ruler in a creep calibrator includes a first clamp, a second clamp, and a connector. The first clamp has a first mounting hole, and the extensometer calibrator is fitted into the first mounting hole. The second clamp has a second mounting hole, and the grating ruler is fitted into the second mounting hole. The two ends of the connector are respectively connected to the first clamp and the second clamp, so that the extensometer calibrator and the measuring axis of the grating ruler are coaxially opposite to each other.

[0015] The connector's two ends can be fixed to the first and second clamps respectively using bolts or clips. Since the connector itself is a rigid structure, this ensures that the first and second clamps maintain a fixed relative position. The first mounting hole matches the shape of the extensometer calibrator, and the extensometer calibrator is installed on the first clamp using a fitting method. This limits the extensometer calibrator's lateral and longitudinal offset, ensuring the stability of its measuring axis position. The second mounting hole of the second clamp is adapted to the shape of the grating ruler, and the grating ruler is fixed by fitting, similarly limiting its displacement and ensuring that the grating ruler's measuring axis position does not shift. This ensures that the fixed extensometer calibrator and the grating ruler's measuring axes are in a coaxial relative state, ultimately guaranteeing the accuracy of the calibration data. This effectively meets the calibration and verification requirements of the creep testing machine's grating ruler, providing support for the efficiency of the calibration process and the accuracy of the results, and ensuring reliable subsequent value transfer. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of a fixture for calibrating a creep machine grating ruler, provided in this application; Figure 2 for Figure 1 A schematic diagram of the structure equipped with a grating ruler and an extensometer calibrator; Figure 3 for Figure 2 Schematic diagram of the structure of the optical grating ruler; Figure 4 for Figure 2 A schematic diagram of the structure of the extensometer calibrator.

[0018] Explanation of reference numerals in the attached figures: 1. First clamping member; 11. First mounting hole; 12. First locking hole; 13. Deformation gap; 14. Adjusting nut; 15. First locking member; 2. Connecting member; 3. Second clamping member; 31. First clamping sleeve; 311. First threaded opening; 32. Second clamping sleeve; 33. Second mounting hole; 34. Second locking hole; 35. Second locking member; 4. Rubber ring; 5. Grating ruler sleeve; 6. Grating ruler; 7. Extensometer calibrator. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0021] like Figures 1 to 4As shown, this application provides a fixture for calibrating a creep grating ruler, comprising a first clamp 1, a second clamp 3, and a connector 2. The first clamp 1 has a first mounting hole 11, on which the extensometer calibrator 7 is fitted. Preferably, the first mounting hole 11 is a circular hole adapted to the outer periphery of the extensometer calibrator 7, and its diameter is slightly larger than the outer diameter of the extensometer calibrator 7. The second clamp 3 has a second mounting hole 33, on which the grating ruler 6 is fitted. Preferably, the second mounting hole 33 is a circular hole adapted to the outer periphery of the grating ruler 6, and its diameter is slightly larger than the outer diameter of the grating ruler 6. The two ends of the connector 2 are respectively connected to the first clamp 1 and the second clamp 3, so that the measuring axes of the extensometer calibrator 7 and the grating ruler 6 are coaxially opposite each other.

[0022] The two ends of the connector 2 can be fixed to the first clamp 1 and the second clamp 3 respectively by bolts, clips, etc. Since the connector 2 itself is a rigid structure, this ensures that the first clamp 1 and the second clamp 3 maintain a fixed relative position. The size of the first mounting hole 11 of the first clamp 1 matches the shape of the extensometer calibrator 7. The extensometer calibrator 7 is installed on the first clamp 1 by fitting, which can limit the lateral and longitudinal displacement of the extensometer calibrator 7 and ensure the stability of its measuring axis position. The second mounting hole 33 of the second clamp 3 is connected to the optical... The grating ruler 6 is externally compatible and is fixed in place by a set, which also restricts its displacement and ensures that the measuring axis of the grating ruler 6 does not shift. The set installation does not require much additional space and can be adapted to the limited installation environment of the testing machine. This ensures that the measuring axes of the fixed extensometer calibrator 7 and the grating ruler 6 are in a coaxial and relative state, ultimately ensuring the accuracy of the calibration data. It can effectively meet the calibration and verification requirements of the grating ruler 6 of the creep testing machine, and provide support for the efficiency of the calibration process and the accuracy of the results, ensuring the reliability of subsequent value transfer.

[0023] In this embodiment, as Figure 1 As shown, the first clamp 1 is provided with a deformation gap 13, and the deformation gap 13 communicates with the first mounting hole 11. Preferably, the deformation gap 13 is a strip-shaped through groove extending radially along the first mounting hole 11, one end of which communicates with the inner wall of the first mounting hole 11, and the other end extends to the outer peripheral wall of the first clamp 1; the deformation gap 13 divides the portion of the first clamp 1 corresponding to the first mounting hole 11 into two elastically deformable clamping arms, and the first locking hole 12 passes through one of the clamping arms; thus, the first clamp 1 can lock or release the extensometer calibrator 7 in the first mounting hole 11 through the elastic deformation of the deformation gap 13.

[0024] In this embodiment, as Figure 1As shown, the first clamping member 1 is also provided with a first locking hole 12, and the first locking hole 12 extends laterally through both sides of the deformation gap 13. A first locking member 15 is provided in the first locking hole 12. Preferably, the first locking member 15 can be a set screw, an elastic clamp, or an M4 bolt, to lock and fix the extensometer calibrator 7 sleeved in the first mounting hole 11. When the first locking member 15 is screwed into the first locking hole 12 and pressed against the first mounting hole 11, the two clamping arms can move closer to each other along the deformation gap 13 to generate elastic deformation, so that the diameter of the first mounting hole 11 is reduced to hold the extensometer calibrator 7 sleeved therein, realizing adaptive clamping. In this way, it can also be compatible with extensometer calibrators 7 with certain dimensional tolerances.

[0025] In this embodiment, as Figure 1 As shown, the second clamp 3 includes a first clamp 31 and a second clamp 32; the first clamp 31 and the second clamp 32 together form the second mounting hole 33. Specifically, the first clamping sleeve 31 includes a first fixing part, a second fixing part, and a first clamping part. The first clamping part is connected to the first fixing part and the second fixing part, and is integrally formed. Both the first fixing part and the second fixing part are provided with second mounting holes 33. The first clamping part is convex facing the first clamping member 1 and is provided with a first threaded opening 311. The second clamping sleeve 32 includes a third fixing part, a fourth fixing part, and a second clamping part. The second clamping part is connected to the third fixing part and the fourth fixing part, and is integrally formed. Both the third fixing part and the fourth fixing part are provided with corresponding second mounting holes 33. The second clamping part is convex away from the first clamping part and surrounds the first clamping part to form the second mounting hole 33, so as to position and fix the grating ruler 6. The stable clamping ensures that the grating ruler 6 maintains a stable installation posture during calibration and periodic verification, avoids positional deviation, further enhances the positional accuracy of the grating ruler 6 after installation, and ensures the accuracy of calibration data.

[0026] In this embodiment, as Figure 1 As shown, the first clamping sleeve 31 and the second clamping sleeve 32 are respectively provided with at least one pair of second locking holes 34, and each second locking hole 34 is provided with a second locking member 35 to lock and fix the grating ruler 6 sleeved in the second mounting hole 33. Preferably, the second locking member 35 is a bolt, and its specification is M8. Specifically, when the grating ruler 6 is placed into the second mounting hole 33 surrounded by the two clamping sleeves, tightening the second locking member 35 can make the first clamping sleeve 31 and the second clamping sleeve 32 fit tightly, completely eliminating the gap between the clamping sleeve and the grating ruler 6, and preventing the grating ruler 6 from axially or radially loosening due to vibration or force during the measurement process; the pressure of the second locking member 35 will be evenly transmitted to the inner wall of the clamping sleeve, forming a ring-shaped rigid fixation. Compared with the fixation by the elasticity of the clamping sleeve itself, it can withstand greater external force and ensure the stability of the position of the measuring axis of the grating ruler 6.

[0027] During clamping, if a slight deviation in the coaxiality between the grating ruler 6 and the extensometer calibrator 7 is found, there is no need to disassemble and reassemble the clamps. Simply adjust the second locking member 35 in the corresponding direction, such as loosening one side and tightening the other, to slightly deform or displace the clamps and correct the position of the grating ruler 6, ensuring precise alignment of the measuring axis. For grating rulers 6 with different outer diameters, the clamping inner diameter of the clamps can be changed by adjusting the tightening of the locking members, allowing for adaptation without replacing the clamps and improving the versatility of the fixture. If maintenance of the clamps is required, such as cleaning stains on the inner wall or replacing worn clamps, the two clamps can be directly separated after loosening the locking members, providing more operating space and higher maintenance efficiency.

[0028] It is clear that by simultaneously locking the first clamping sleeve 31 and the second clamping sleeve 32 with the second locking members 35 on both sides, and the second mounting hole 33 formed by the two clamping sleeves, a uniform clamping force can be applied to the grating ruler 6 (or grating ruler sleeve 5) from both sides. This enables the grating ruler 6 to be fully wrapped and constrained in all directions, providing a large contact area and gripping force, ensuring extreme stability under vibration or long-term use. This avoids the grating ruler 6 being pushed away from the center position due to force on one side, ensuring extremely high alignment. In addition, by adjusting the fitting gap between the two clamping sleeves and replacing the grating ruler sleeve 5 with different inner diameters, grating rulers 6 of different diameters can be adapted; and by adjusting the second locking member 35, installation errors can be further corrected, so that the central axis of the second mounting hole 33 is aligned with the preset reference, improving the overall calibration accuracy.

[0029] In this embodiment, the first clamp 31 is provided with a first threaded opening 311, and the first clamp 1 is provided with a second threaded opening; wherein, the two ends of the connector 2 are respectively threaded to the first threaded opening 311 and the second threaded opening; preferably, the connector 2 can be a threaded rod, a telescopic sleeve or a connector with multiple positioning holes, and the distance between the first clamp 1 and the second clamp 3 can be changed by adjusting the length of the connector 2 to adapt to extensometer calibrators 7 or grating rulers 6 of different lengths.

[0030] In this embodiment, an adjusting nut 14 is also included. The adjusting nut 14 is connected to the connecting member 2 and is used to fine-tune the relative distance between the first clamp 1 and the second clamp 3. Preferably, the adjusting nut 14 is a set screw, mainly used to assist in adjusting the relative distance between the grating ruler 6 and the extensometer calibrator 7. The adjusted position is locked by tightening the set screw to ensure assembly accuracy. Specifically, the distance between the grating ruler 6 and the extensometer calibrator 7 can be precisely adjusted by rotating the threaded rod, and the position is locked by the set screw, ultimately ensuring the accuracy of the assembly position of each component and meeting the spatial adaptation requirements for the calibration of the grating ruler 6.

[0031] In this embodiment, as Figure 1As shown, it also includes a rubber ring 4, which is sleeved on the second locking member 35 and located between the mating surfaces of the first clamp 31 and the second clamp 32, thereby realizing the functions of fixing, shock absorption and limiting. It can effectively reduce the vibration transmission of the grating ruler 6, while limiting its displacement range, and avoiding the impact of vibration or offset on the calibration accuracy.

[0032] In this embodiment, as Figures 1 to 2 As shown, a grating ruler sleeve 5 is also fitted inside the second mounting hole 33. Specifically, it is fitted onto the surface of the grating ruler 6 during the installation and fixing process, which can prevent the clamping force from acting directly on the body of the grating ruler 6, thereby protecting the grating ruler 6 from being pinched or scratched, and preventing damage to its structural integrity and accuracy performance.

[0033] In this embodiment, the first clamp 1 is first securely installed in the designated mounting position of the extensometer calibrator 7 using the first locking member 15, ensuring that the first locking member 15 is firmly in place and without looseness; then, the first clamp 31, the second clamp 32, and the grating ruler sleeve 5 are sequentially connected and assembled using the second locking member 35, ensuring a tight fit at each connection, and the second locking member 35 is tightened to the specified torque to ensure the overall coaxiality and stability of the second clamp 3; then, the threaded rod is mated and installed with the first threaded opening 311 on the assembled first clamp 31, and the position of the overall assembly is adjusted so that the first mounting hole 11 of the first clamp 1 is aligned with the top of the lifting rod of the extensometer calibrator 7, ensuring that the movement trajectory of the lifting rod coincides with the center line of the hole; After confirming that the calibration is correct, tighten the threaded rod with a set screw to prevent positional deviation during subsequent operations. Finally, place the grating ruler sleeve 5 in the first mounting hole 11 onto the designated clamping position of the extensometer to be calibrated, and check the fit and clamping stability between the grating ruler sleeve 5 and the extensometer. Then, place the entire grating ruler sleeve 5 containing the extensometer into the corresponding tooling hole of the fixed tooling assembly, ensuring that the installation posture of the extensometer meets the calibration requirements. After completing the above preparations, start the calibration program according to the operating procedures of the extensometer calibrator 7 and perform normal calibration operations. In this way, the calibration and verification requirements of the grating ruler 6 of the creep testing machine can be effectively met, providing support for the efficiency of the calibration process and the accuracy of the results, and ensuring the reliability of subsequent value transfer.

[0034] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a 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 application according to the specific circumstances.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0038] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0039] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A fixture for calibrating a grating ruler in a creep calibrator, characterized in that, include: The first clamp has a first mounting hole, and an extensometer calibrator is fitted into the first mounting hole. The second clamp is provided with a second mounting hole, and a grating ruler is fitted into the second mounting hole; A connector, the two ends of which are respectively connected to the first clamp and the second clamp, so that the extensometer calibrator and the measuring axis of the grating ruler are coaxially opposite each other.

2. The fixture for calibrating a creep grating ruler in a creep tester according to claim 1, characterized in that, The first clamp is provided with a deformation gap, and the deformation gap is connected to the first mounting hole.

3. The fixture for calibrating a creep grating ruler in a creep tester according to claim 2, characterized in that, The first clamp is also provided with a first locking hole, and the first locking hole extends laterally through both sides of the deformation gap, and a first locking element is provided in the first locking hole to lock and fix the extensometer calibrator sleeved in the first mounting hole.

4. The fixture for calibrating a creep grating ruler in a creep calibrator according to claim 1, characterized in that, The second clamping member includes a first clamp and a second clamp; the first clamp and the second clamp together form the second mounting hole.

5. The fixture for calibrating a creep grating ruler in a creep tester according to claim 4, characterized in that, The first sleeve and the second sleeve are provided with at least one pair of second locking holes, and each second locking hole is provided with a second locking member to lock and fix the grating ruler sleeved in the second mounting hole.

6. The fixture for calibrating a creep grating ruler in a creep tester according to claim 4, characterized in that, The first clamping sleeve is provided with a first threaded opening, and the first clamping member is provided with a second threaded opening; The two ends of the connector are threaded to the first threaded opening and the second threaded opening, respectively.

7. The fixture for calibrating a creep grating ruler in a creep tester according to claim 6, characterized in that, It also includes an adjusting nut, which is connected to the connector and is used to fine-tune the relative distance between the first clamp and the second clamp.

8. The fixture for calibrating a creep grating ruler in a creep tester according to claim 5, characterized in that, It also includes a rubber ring, which is sleeved on the second locking member and located between the mating surfaces of the first clamp and the second clamp.

9. The fixture for calibrating a creep grating ruler in a creep machine according to claim 1, characterized in that, A grating ruler sleeve is also fitted inside the second mounting hole.

Images