A positioning and calibration device for extensometer of MTS testing machine

Abstract

The present invention relates to the technical field of MTS testing machines, and discloses a positioning and calibration device for an extensometer of an MTS testing machine, which comprises: a tensile testing machine, which is provided with a movable crossbeam that slides up and down inside; an upper clamp, which is installed at the middle of the lower end surface of the movable crossbeam, and the tensile testing machine is provided with a lower clamp corresponding to the upper clamp; a positioning and calibration unit, which is installed on the tensile testing machine; an extensometer, which is arranged outside the tensile testing machine, and the positioning and calibration unit is provided with a clamping part, and the extensometer is detachably installed on the positioning and calibration unit on a side close to the tensile testing machine through the clamping part; a track frame, which is fixed to the tensile testing machine through two mounting plates installed below it; and a roller seat, which is slidably installed on the track frame. The present invention can perform high-precision positioning and calibration of the extensometer, so as to maintain the clamping position and clamping contact point of the extensometer and the test piece to be completely consistent, and avoid the error caused by human operation.

Description

Technical Field

[0001] The invention belongs to the technical field of MTS testing machines, in particular to an MTS testing machine extensometer positioning and calibration device. Background Art

[0002] MTS testing machine is a high-end instrument widely used in testing the mechanical properties of materials, and extensometer is one of its key accessories. It is usually composed of three parts: sensor, amplifier and recorder. It is mainly used to accurately measure the linear deformation of the specimen during the force process, and then deduce important parameters such as stress-strain curve. Common extensometer types can be roughly divided into mechanical extensometer, optical extensometer and electromagnetic extensometer. At present, when the MTS testing machine is used to test material specimens, the two chucks at the end of the extensometer are generally clamped on the material specimen by the experimenter manually through the fixture. Manual operation depends on the experience and technology of the experimenter, which can easily lead to inaccurate clamping position and deviation of the clamping contact point, affecting the repeatability and accuracy of the measurement. At the same time, each test requires manual intervention and adjustment, which will consume more time and reduce the overall work efficiency, especially when testing a large number of samples.

[0003] Therefore, it is necessary to provide an MTS testing machine extensometer positioning and calibration device to solve the problems raised in the above background technology. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solution: a positioning and calibration device for an extensometer of an MTS testing machine, comprising:

[0005] A tensile testing machine, which has a moving beam that slides up and down inside;

[0006] An upper fixture is installed at the middle of the lower end surface of the moving crossbeam, and a lower fixture corresponding to the upper fixture is installed on the tensile testing machine, and the upper fixture and the lower fixture are clamped at two ends of the test piece respectively;

[0007] A positioning calibration unit is installed on the tensile testing machine;

[0008] An extensometer is arranged outside the tensile testing machine. The positioning and calibration unit is provided with a clamping part. The extensometer is detachably mounted on the positioning and calibration unit on a side close to the tensile testing machine through the clamping part. The extensometer contacts the specimen through two clamps at its ends, thereby being firmly connected to the specimen, so as to measure the deformation of the specimen during the material testing process.

[0009] A track frame, the cross section of which is a circular ring structure, and the track frame is fixed to the tensile testing machine through two mounting plates installed below the track frame;

[0010] A roller seat is slidably mounted on the track frame, a bottom plate is mounted below the positioning and calibration unit, and the bottom plate is fixed to the roller seat;

[0011] A standard rubber belt specimen is clamped between the upper clamp and the lower clamp. The positioning and calibration unit uses a first measuring action to push the extensometer to one side of the standard rubber belt specimen so that the two clamps of the extensometer are respectively contacted and positioned on the surface of the standard rubber belt specimen. The tensile testing machine provides calibration detection for the extensometer through the deformation deviation of the standard rubber belt specimen. The positioning and calibration unit then uses a second calibration action to perform spatial positioning adjustment on the extensometer, thereby changing the two clamps to the optimal contact position.

[0012] Further, as a preferred embodiment, a MTS testing machine extensometer positioning and calibration device is characterized in that it comprises:

[0013] A tensile testing machine, which has a moving beam that slides up and down inside;

[0014] An upper fixture is installed at the middle of the lower end surface of the moving crossbeam, and a lower fixture corresponding to the upper fixture is installed on the tensile testing machine, and the upper fixture and the lower fixture are clamped at two ends of the test piece respectively;

[0015] A positioning calibration unit is installed on the tensile testing machine;

[0016] An extensometer is arranged outside the tensile testing machine. The positioning and calibration unit is provided with a clamping part. The extensometer is detachably mounted on the positioning and calibration unit on a side close to the tensile testing machine through the clamping part. The extensometer contacts the specimen through two clamps at its ends, thereby being firmly connected to the specimen, so as to measure the deformation of the specimen during the material testing process.

[0017] A track frame, the cross section of which is a circular ring structure, and the track frame is fixed to the tensile testing machine through two mounting plates installed below the track frame;

[0018] A roller seat is slidably mounted on the track frame, a bottom plate is mounted below the positioning and calibration unit, and the bottom plate is fixed to the roller seat;

[0019] A standard rubber belt specimen is clamped between the upper clamp and the lower clamp. The positioning and calibration unit uses a first measuring action to push the extensometer to one side of the standard rubber belt specimen so that the two clamps of the extensometer are respectively contacted and positioned on the surface of the standard rubber belt specimen. The tensile testing machine provides calibration detection for the extensometer through the deformation deviation of the standard rubber belt specimen. The positioning and calibration unit then uses a second calibration action to perform spatial positioning adjustment on the extensometer, thereby changing the two clamps to the optimal contact position.

[0020] Further, as a preference, a displacement sensor is provided on the clamping portion, and the displacement sensor feeds back the spatial displacement change of the clamping portion in real time.

[0021] Further, preferably, the angle adjuster comprises:

[0022] A rotating plate is arranged on a side of the main frame away from the mounting block, the rotating plate is connected with an axle pin, and one end of the axle pin is rotatably connected to the main frame;

[0023] A side support plate, whose cross section is an L-shaped structure, the side support plate is fixed to the rotating plate, a shaft connection block is bolted to the side support plate, and the propulsion assembly is fixed to one side end surface of the shaft connection block;

[0024] A U-shaped card plate is arranged at one end of the main frame, a pin is vertically fixed to one end of the rotating plate, the U-shaped card plate is connected to the pin shaft through its notch, and a guard plate is fixed on the main frame outside the U-shaped card plate;

[0025] A shaft rod is vertically slidably connected to the main frame, the upper end of the shaft rod is connected to the U-shaped clamping plate, a threaded sleeve is rotatably connected in the main frame, and the shaft rod is inserted into the threaded sleeve, so that the shaft rod is pushed by the thread to slide up and down;

[0026] The motor driver is installed on the main frame. An external gear is coaxially fixed outside the threaded sleeve. The motor driver is connected and transmitted with the external gear on the threaded sleeve through gear meshing.

[0027] Further, preferably, the rotation angle range of the rotating plate is between -10° and 15°.

[0028] Further, as a preference, the propulsion assembly comprises:

[0029] A fixed frame, one side of which is slidably connected to an adjusting arm via a slider, an electric telescopic rod is fixed to the fixed frame, and one end of the electric telescopic rod is connected to the adjusting arm;

[0030] Straight plate, fixed on the adjustment arm;

[0031] A side guide block is vertically fixed on one end surface of the straight plate. Two guide holes are provided on the side guide block. Guide rods are slidably connected in the guide holes. The ends of the guide rods are connected to the connecting plate.

[0032] A fine-tuning power rod is horizontally fixed at the middle part of the side guide block, and one end of the fine-tuning power rod passes through the straight plate and is connected to the connecting plate.

[0033] Further, as a preference, a turntable seat is further provided between the clamping portion and the connecting plate, the turntable seat is composed of two shaft discs that can rotate relatively, and the clamping portion and the connecting plate are respectively fixed to the two shaft discs of the turntable seat;

[0034] The side wall of the turntable seat is provided with a scale groove.

[0035] Further, preferably, the turntable seat moves the extensometer on the clamping part closer to or away from the test piece during rotation adjustment.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] In the present invention, a positioning and calibration unit is arranged on the tensile testing machine. The positioning and calibration unit can clamp and fix the extensometer through a clamping part, and position and calibrate the extensometer before the test experiment, so as to maintain the clamping position and clamping contact point of the extensometer and the specimen to be completely consistent, prevent the error caused by human operation, and improve the deformation measurement accuracy in the specimen test; in particular, in the positioning and calibration of the extensometer, a standard rubber belt specimen is introduced. The standard rubber belt specimen has known and stable elastic properties. As a reference, the positioning and calibration accuracy can be improved, and the zero point and range of the extensometer can be further accurately calibrated to ensure the accuracy of the measurement result. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the present invention;

[0039] Figure 2 It is a front view of the present invention;

[0040] Figure 3 It is a structural schematic diagram of the positioning calibration unit in the present invention;

[0041] Figure 4 It is a structural schematic diagram of the main frame and the clamping part in the present invention;

[0042] Figure 5 It is a structural schematic diagram of the angle adjuster in the present invention;

[0043] Figure 6 It is a front view of the angle adjuster in the present invention;

[0044] Figure 7 It is a structural schematic diagram of the propulsion assembly in the present invention;

[0045] In the figure: 1. tensile testing machine; 11. moving crossbeam; 12. upper fixture; 13. track frame; 14. mounting plate; 15. roller seat; 16. bottom plate; 2. positioning and calibration unit; 21. bracket body; 22. power seat; 23. main frame; 24. mounting block; 25. connecting plate; 26. turntable seat; 3. clamping part; 4. angle adjuster; 41. rotating plate; 42. axis pin; 43. side support plate; 44. axis connecting block; 45. U-shaped card plate; 46. pin shaft; 47. guard plate; 48. shaft rod; 49. threaded sleeve; 410. external gear; 5. propulsion assembly; 51. fixed frame; 52. adjustment arm; 53. straight plate; 54. electric telescopic rod; 55. slider; 6. side guide block; 61. guide rod; 62. fine-tuning power rod. DETAILED DESCRIPTION

[0046] See also Figure 1-Figure 7 In an embodiment of the present invention, a positioning and calibration device for an extensometer of an MTS testing machine includes:

[0047] The tensile testing machine 1 has a movable beam 11 which slides up and down inside;

[0048] The upper fixture 12 is installed at the middle of the lower end surface of the moving crossbeam 11. The tensile testing machine 1 is equipped with a lower fixture corresponding to the upper fixture 12. The upper fixture 12 and the lower fixture are respectively clamped at both ends of the specimen; that is, the specimen is vertically clamped between the upper fixture 12 and the lower fixture, so that the tensile testing machine 1 provides a tensile test on the specimen;

[0049] A positioning and calibration unit 2 is installed on the tensile testing machine 1;

[0050] An extensometer (in the present invention, the extensometer is an electronic extensometer by default) is arranged outside the tensile testing machine 1. The positioning and calibration unit 2 is provided with a clamping portion 3. The extensometer is detachably mounted on the positioning and calibration unit 2 on a side close to the tensile testing machine 1 through the clamping portion 3. The extensometer contacts the specimen through two clamps at its ends, thereby being firmly connected to the specimen, so as to measure the deformation of the specimen during the material testing process;

[0051] A track frame 13, whose cross section is a circular ring structure, and the track frame 13 is fixed to the tensile testing machine 1 through two mounting plates 14 installed below the track frame 13;

[0052] The roller seat 15 is slidably mounted on the track frame 13, and a bottom plate 16 is mounted below the positioning and calibration unit 2, and the bottom plate 16 is fixed to the roller seat 15; the positioning and calibration unit 2 can be slidably adjusted along the track frame 13 by the roller seat 15, thereby effectively changing the contact clamping of the extensometer on the clamping part 3 on the narrow surface or the wide surface of the specimen, and has high flexibility;

[0053] A standard rubber belt specimen is clamped between the upper fixture 12 and the lower fixture. The standard rubber belt has known and stable elastic properties and good durability. As a low-cost calibration tool, it can effectively control the experimental cost while ensuring high-quality testing. The positioning calibration unit 2 uses the first measuring action to push the extensometer to one side of the standard rubber belt specimen so that the two clamps of the extensometer are respectively contacted and positioned on the surface of the standard rubber belt specimen. The tensile testing machine 1 provides calibration detection for the extensometer through the deformation deviation of the standard rubber belt specimen; the positioning calibration unit 2 then uses the second calibration action to adjust the spatial positioning of the extensometer, thereby changing the two clamps to the optimal contact position; that is, in the first measuring action, the extensometer can be initially positioned and start to monitor the deformation of the rubber belt. Since the rubber belt has known elastic properties, any deviation will be recorded by the tensile testing machine 1 and used to evaluate the initial calibration state of the extensometer. The second calibration action is based on the deviation identified in the first step, and the positioning calibration unit 2 performs fine spatial positioning adjustment. In this way, not only can possible installation deviations be corrected, but also the sensitivity and accuracy of extensometer measurement can be optimized.

[0054] In this embodiment, the positioning calibration unit 2 includes:

[0055] The bracket body 21 is vertically fixed on the bottom plate 16;

[0056] The power seat 22 is slidably mounted on one side of the bracket body 21. A ball screw is rotatably connected in the bracket body 21. The power seat 22 is slidably connected to the threaded portion of the ball screw, so that the thread pushes the power seat 22 to move along the axial direction of the ball screw.

[0057] A main frame 23, a mounting block 24 is fixed to one side thereof, and the main frame 23 is fixed to the power seat 22 through the mounting block 24;

[0058] Angle adjuster 4, mounted on one side of main frame 23;

[0059] The propulsion assembly 5 is fixed on the angle adjuster 4, and a connecting plate 25 is installed on the propulsion assembly 5. The clamping part 3 is fixed on one side of the connecting plate 25, wherein the power seat 22 can move and adjust the extensometer in the Y-axis direction, and the propulsion assembly 5 can move and adjust the extensometer in the X-axis and Z-axis directions.

[0060] As a preferred embodiment, a displacement sensor is provided on the clamping part 3, and the displacement sensor feeds back the spatial displacement change of the clamping part in real time.

[0061] In this embodiment, the angle adjuster 4 includes:

[0062] The rotating plate 41 is arranged on a side of the main frame 23 away from the mounting block 24, and the rotating plate 41 is connected with an axle pin 42, and one end of the axle pin 42 is rotatably connected to the main frame 23;

[0063] A side support plate 43, whose cross section is an L-shaped structure, the side support plate 43 is fixed to the rotating plate 41, a shaft connecting block 44 is bolted to the side support plate 43, and the propulsion assembly 5 is fixed to one side end surface of the shaft connecting block 44;

[0064] A U-shaped card plate 45 is arranged at one end of the main frame 23, a pin shaft 46 is vertically fixed to one end of the rotating plate 41, the U-shaped card plate 45 is connected to the pin shaft 46 through its notch, and a guard plate 47 is fixed on the main frame 23 outside the U-shaped card plate 45; the pin shaft 46 can slide horizontally along the notch of the U-shaped card plate 45;

[0065] A shaft rod 48 is vertically slidably connected to the main frame 23. The upper end of the shaft rod 48 is connected to the U-shaped clamping plate 45. A threaded sleeve 49 is rotatably connected to the main frame 23. The shaft rod 48 is inserted into the threaded sleeve 49 so that the shaft rod 48 slides up and down under the push of the thread.

[0066] The motor driver is mounted on the main frame 23 , and an external gear 410 is coaxially fixed outside the threaded sleeve 49 . The motor driver is connected to the external gear 410 on the threaded sleeve 49 for transmission through gear meshing.

[0067] In this embodiment, the rotation angle range of the rotating plate 41 is between -10° and 15°.

[0068] In this embodiment, the propulsion assembly 5 includes:

[0069] A fixed frame 51, one side of which is slidably connected to an adjusting arm 52 via a slider 55, an electric telescopic rod 54 is fixed to the fixed frame 51, and one end of the electric telescopic rod 54 is connected to the adjusting arm 52;

[0070] A straight plate 53, fixed on the adjustment arm 52;

[0071] A side guide block 6 is vertically fixed to one end surface of the straight plate 53. Two guide holes are provided on the side guide block 6. A guide rod 61 is slidably connected in each of the guide holes. The end of the guide rod 61 is connected to the connecting plate 25.

[0072] The fine-tuning power rod 62 is horizontally fixed at the middle of the side guide block 6 , and one end of the fine-tuning power rod 62 passes through the straight plate 53 and is connected to the connecting plate 25 .

[0073] As a preferred embodiment, a turntable seat 26 is further provided between the clamping portion 3 and the connecting plate 25. The turntable seat 26 is composed of two shaft discs that can rotate relatively. The clamping portion 3 and the connecting plate 25 are respectively fixed to the two shaft discs of the turntable seat 26.

[0074] The side wall of the turntable seat 26 is provided with a scale groove.

[0075] In this embodiment, the turntable seat 26 moves the extensometer on the clamping part 3 closer to or away from the test piece during the rotation adjustment, that is, in the second calibration action, the angle adjustment of the extensometer is formed with the X-axis as the axis through the angle adjuster, and the turntable seat can form the angle adjustment of the extensometer with the Y-axis as the axis. At the same time, the sliding cooperation between the bracket body and the track frame can form the angle adjustment of the extensometer with the Z-axis as the axis; which can cooperate with the displacement adjustment of the propulsion assembly 5 to achieve complete spatial positioning of the extensometer.

[0076] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An MTS testing machine extensometer positioning and calibration device, characterized in that: It includes: A tensile testing machine (1) is provided with a movable crossbeam (11) that slides up and down; An upper clamp (12) is mounted on the middle portion of the lower end surface of the movable crossbeam (11); a lower clamp corresponding to the upper clamp (12) is mounted on the tensile testing machine (1); the upper clamp (12) and the lower clamp are respectively clamped at two ends of the test piece; A positioning calibration unit (2) is mounted on the tensile testing machine (1); An extensometer is arranged outside the tensile testing machine (1); a clamping portion (3) is provided on the positioning and calibration unit (2); the extensometer is detachably mounted on a side of the positioning and calibration unit (2) close to the tensile testing machine (1) through the clamping portion (3); and the extensometer contacts the test piece through two clamps at its ends, thereby being firmly connected to the test piece, so as to measure the deformation of the test piece during the material testing process; A track frame (13) having a cross section in the form of a circular ring structure, and the track frame (13) is fixed to the tensile testing machine (1) via two mounting plates (14) mounted below the track frame (13); The roller seat (15) is slidably mounted on the track frame (13), and a bottom plate (16) is mounted below the positioning and calibration unit (2), and the bottom plate (16) is fixed to the roller seat (15); A standard rubber belt specimen is clamped between the upper clamp (12) and the lower clamp, and the positioning calibration unit (2) uses a first measuring action to push the extensometer to one side of the standard rubber belt specimen so that the two clamps of the extensometer are respectively contacted and positioned on the surface of the standard rubber belt specimen, and the tensile testing machine (1) provides calibration detection for the extensometer through the deformation deviation of the standard rubber belt specimen; the positioning calibration unit (2) then uses a second calibration action to perform spatial positioning adjustment on the extensometer, thereby changing the two clamps to an optimal contact position.

2. The MTS testing machine extensometer positioning and calibration device according to claim 1, characterized in that: The positioning calibration unit (2) comprises: A bracket body (21) is vertically fixed on the bottom plate (16); A power seat (22) is slidably mounted on one side of the bracket body (21), a ball screw is rotatably connected inside the bracket body (21), and the power seat (22) is slidably connected to a threaded portion of the ball screw, so that the thread pushes the power seat (22) to move along the axial direction of the ball screw; A main frame (23) has a mounting block (24) fixed on one side thereof, and is fixed to the power base (22) via the mounting block (24); An angle adjuster (4) mounted on one side of the main frame (23); The propulsion assembly (5) is fixed on the angle adjuster (4), a connecting plate (25) is mounted on the propulsion assembly (5), and the clamping portion (3) is fixed on one side of the connecting plate (25).

3. The MTS testing machine extensometer positioning and calibration device according to claim 2, characterized in that: A displacement sensor is provided on the clamping portion (3), and the displacement sensor provides real-time feedback of changes in the spatial displacement of the clamping portion.

4. The MTS testing machine extensometer positioning and calibration device according to claim 2, characterized in that: The angle adjuster (4) comprises: A rotating plate (41) is arranged on a side of the main frame (23) away from the mounting block (24), and a shaft pin (42) is connected to the rotating plate (41), and one end of the shaft pin (42) is rotatably connected to the main frame (23); The side support plate (43) has an L-shaped cross section, the side support plate (43) is fixed to the rotating plate (41), a shaft connection block (44) is bolted to the side support plate (43), and the propulsion assembly (5) is fixed to one end surface of the shaft connection block (44); A U-shaped card plate (45) is arranged at one end of the main frame (23); a pin shaft (46) is vertically fixed to one end of the rotating plate (41); the U-shaped card plate (45) is connected to the pin shaft (46) through its notch; and a guard plate (47) is fixed outside the U-shaped card plate (45) on the main frame (23); A shaft rod (48) is vertically slidably connected to the main frame (23), the upper end of the shaft rod (48) is connected to the U-shaped clamping plate (45), a threaded sleeve (49) is rotatably connected in the main frame (23), and the shaft rod (48) is inserted into the threaded sleeve (49), so that the shaft rod (48) is pushed by the thread to slide up and down; The motor driver is mounted on the main frame (23). An external gear (410) is coaxially fixed outside the threaded sleeve (49). The motor driver is connected to the external gear (410) on the threaded sleeve (49) for transmission through gear meshing.

5. The MTS testing machine extensometer positioning and calibration device according to claim 4, characterized in that: The rotation angle range of the rotating plate (41) is between -10° and 15°.

6. The MTS testing machine extensometer positioning and calibration device according to claim 2, characterized in that: The propulsion assembly (5) comprises: A fixed frame (51), one side of which is slidably connected to an adjusting arm (52) via a slider (55); an electric telescopic rod (54) is fixed to the fixed frame (51); one end of the electric telescopic rod (54) is connected to the adjusting arm (52); A straight plate (53) fixed on the adjustment arm (52); A side guide block (6) is vertically fixed to one end surface of the straight plate (53). Two guide holes are formed on the side guide block (6). Guide rods (61) are slidably connected in the guide holes. The ends of the guide rods (61) are connected to the connecting plate (25). The fine-tuning power rod (62) is horizontally fixed to the middle part of the side guide block (6), and one end of the fine-tuning power rod (62) passes through the straight plate (53) and is connected to the connecting plate (25).

7. The MTS testing machine extensometer positioning and calibration device according to claim 2, characterized in that: A turntable seat (26) is further provided between the clamping portion (3) and the connecting plate (25). The turntable seat (26) is composed of two shaft discs that can rotate relative to each other. The clamping portion (3) and the connecting plate (25) are respectively fixed to the two shaft discs of the turntable seat (26). The side wall of the turntable seat (26) is provided with a scale groove.

8. The MTS testing machine extensometer positioning and calibration device according to claim 7, characterized in that: The turntable seat (26) moves the extensometer on the clamping part (3) closer to or away from the test piece during rotation adjustment.

Images