Large-deformation extensometer calibration device

Abstract

The utility model discloses a large deformation extensometer calibration device, and specifically relates to the calibration device field, the large deformation extensometer calibration device comprises a main body, one end of the main body is provided with a protection cover, the top of the main body is fixedly provided with a servo motor, the main body is internally provided with a screw rod, and the output end of the servo motor is connected with the screw rod; the lead screw is sleeved with a nut sleeve matched with the lead screw, a base is arranged at the bottom of the body, and magnetic V-shaped bases are installed at the two ends of the two sides of the base. According to the utility model, the magnetostrictive displacement sensor and the magnetic ring are arranged, and the output of the magnetostrictive displacement sensor is relative to the position of a fixed reference point, so that the magnetostrictive displacement sensor does not need to be reset when power supply is recovered after power failure, and does not need to re-find a reference point (such as an incremental encoder and an incremental grating ruler) like a common incremental sensor; the non-contact magnetic induction technology measuring device is adopted, mechanical abrasion and mechanical vibration do not exist in non-contact measurement, the reliability of the sensor is improved, and the service life of the sensor is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of calibration devices, and more specifically, to a large deformation extensometer calibration device. Background Art

[0002] As the main equipment for measuring the deformation of rubber, plastic and wire materials, large deformation extensometers are increasingly widely recognized by the inspection industry and have become an indispensable testing equipment in performance experiments. Large deformation extensometers are mainly composed of extensometers, displacement sensors, controllers and large deformation measuring devices. The displacement sensor is installed between the two clamping arms of the extensometer to perform small-range high-precision measurements. The large deformation measuring device includes a photoelectric encoder, a groove wheel, a soft wire and a balancing weight to measure the displacement of the clamping arm. The signal output ends of the displacement sensor and the photoelectric encoder are connected to the controller to receive and store the deformation signals collected by the two. Since its displacement measuring device is a universal displacement sensor and photoelectric encoder, the measurement of linear displacement needs to rely on mechanical device conversion, and the error caused by mechanical clearance needs to be eliminated. Long-term use will cause wear and tear on the internal parts of the machine, resulting in zero drift. It is difficult to overcome the influence of slip and other factors when detecting objects running on the track, which will have an adverse effect on the measurement results. At present, the detection method for the metrological performance of large deformation extensometers is still a simple measurement method using calipers, steel rulers and other tools. The measurement results are greatly affected by human factors and cannot achieve the goal of accurate verification. This measurement method cannot guarantee the effective traceability of large deformation extensometers.

[0003] Therefore, a large deformation extensometer calibration device is proposed to address the above problems. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the utility model provides a large deformation extensometer calibration device to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a large deformation extensometer calibration device, comprising a main body, a protective cover is installed at one end of the main body, a servo motor is fixed on the top of the main body, a screw rod is installed inside the main body, and the output end of the servo motor is connected to the screw rod, a nut sleeve matching the screw rod is sleeved on the screw rod, a base is provided at the bottom of the main body, and magnetic V-shaped seats are installed at both ends of both sides of the base;

[0006] A stroke shaft is installed in the main body at one end of the screw rod, and a magnetostrictive displacement sensor is arranged at the bottom of the stroke shaft, a connecting piece is installed at the end of the nut sleeve close to the stroke shaft, and a magnetic ring is arranged in the connecting piece, and the stroke shaft passes through the magnetic ring, a through groove is opened at the end of the protective cover away from the main body, and the connecting piece passes through the through groove, a mounting plate is fixed to the end of the connecting piece away from the nut sleeve, and a connecting component is installed at the end of the mounting plate away from the nut sleeve.

[0007] Preferably, the main body and the protective cover are first clamped and then fixed by bolts, and handles are installed on the top and bottom of the end of the protective cover away from the main body.

[0008] Preferably, the connecting assembly includes an elastic plastic clip, an adjusting piece, a rotating sleeve, a connecting piece and a central axis, a rotating sleeve is arranged inside the elastic plastic clip, and a connecting piece is fixed to one end of the rotating sleeve, the central axis passes through the elastic plastic clip and the rotating sleeve, and the adjusting piece is hinged on the top of the central axis.

[0009] Preferably, mounting ridges are arranged in parallel at equal intervals on both sides of the base, and a magnetic suction groove matching the shape of the mounting ridges is arranged on one side of the magnetic V-shaped seat close to the base.

[0010] Preferably, the elastic plastic clip includes a connecting plate, a clip, a through hole and a limiting toothed disc, the top and bottom of the connecting plate away from the mounting plate are provided with clips, and the opposite surfaces of the clips are fixed with limiting toothed discs, through holes are provided on the limiting toothed disc and the clip, and the central axis passes through the through holes, and teeth are provided on the top and bottom of the rotating sleeve, and the teeth are respectively engaged with the limiting toothed discs.

[0011] Preferably, a rotating shaft is fixed at a middle position of the mounting plate, and the rotating shaft passes through the connecting plate, and a fastening cap is threadedly connected to the end of the rotating shaft, and the fastening cap is in conflict with the connecting plate.

[0012] Preferably, a hand-gripping portion is provided on one side of the adjusting member, and an arc transition portion is provided on the other side of the adjusting member. The adjusting member can be rotated within a range of 0°-90°, and the elastic plastic clip clamps the adjusting member when the adjusting member is rotated to 90°.

[0013] Preferably, the outer diameter of the central axis is smaller than the inner diameter of the through hole, and an anti-dropping piece is provided at the bottom of the central axis, and the outer diameter of the anti-dropping piece is larger than the inner diameter of the through hole.

[0014] Technical effects and advantages of the utility model:

[0015] 1. Compared with the prior art, the large deformation extensometer calibration device is provided with a magnetostrictive displacement sensor and a magnetic ring. The output of the magnetostrictive displacement sensor is relative to a fixed reference point. It does not need to be reset when the power is restored after a power outage. Unlike general incremental sensors that need to find a reference point again (such as incremental encoders and incremental grating rulers), the non-contact magnetic induction technology measurement device is used. There is no mechanical wear and mechanical vibration in non-contact measurement, which improves the reliability and service life of the sensor.

[0016] 2. The calibration device is connected to the clamping arm of the large deformation extensometer through a sophisticatedly designed connecting component. A servo motor is used to drive the screw rod, nut sleeve and magnetic ring to move, and then drive the large deformation extensometer to move, generating a displacement difference to overcome the influence of factors such as the slip of the detection track. Before each measurement test, the calibration device is used to drive the large deformation extensometer to move a small displacement to eliminate the error caused by the mechanical gap, thereby achieving the purpose of calibrating and calibrating the large deformation extensometer.

[0017] 3. The calibration device is provided with a magnetic V-shaped seat with two gears to facilitate the adjustment of the height of the base. The five sides of the magnetic V-shaped seat are magnetic, and one side is provided with a V-shaped groove, so that the device can be magnetically attracted to any magnetic work surface, steel frame, or steel pipe, making it easier to install and fix and more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model.

[0019] Figure 2 It is a schematic diagram of the internal structure of the main body of the utility model.

[0020] Figure 3 This is a schematic diagram of the structure of the connection component of the utility model.

[0021] Figure 4 This is a schematic diagram of the structure of the rotary sleeve of the utility model.

[0022] Figure 5 This is a schematic diagram of the structure of the magnetic V-shaped seat of the utility model.

[0023] Figure 6 This is a schematic diagram of the elastic plastic clip structure of the utility model.

[0024] The accompanying drawings are marked as follows: 1. servo motor; 2. main body; 3. handle; 4. connecting assembly; 5. protective cover; 501. through groove; 6. magnetic V-shaped seat; 601. magnetic suction groove; 7. base; 701. mounting ridge; 8. nut sleeve; 9. screw rod; 10. travel shaft; 11. magnetostrictive displacement sensor; 12. magnetic ring; 13. connector; 14. mounting plate; 15. fastening cap; 16. rotating shaft; 17. elastic plastic clip; 1701. connecting plate; 1702. clip; 1703. through hole; 18. adjusting member; 1801. hand pinching part; 1802. arc transition part; 19. limit toothed disc; 20. rotating sleeve; 2001. tooth groove; 21. connecting plate; 22. middle axis; 2201. anti-dropping plate. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0026] Embodiment 1

[0027] As attached Figure 1 and Figure 2 A large deformation extensometer calibration device shown in the figure comprises a main body 2, a protective cover 5 is installed at one end of the main body 2, a servo motor 1 is fixed on the top of the main body 2, a screw rod 9 is installed inside the main body 2, and the output end of the servo motor 1 is connected to the screw rod 9, a nut sleeve 8 matching the screw rod 9 is sleeved on the screw rod 9, a base 7 is provided at the bottom of the main body 2, and magnetic V-shaped seats 6 are installed at both ends of both sides of the base 7;

[0028] A stroke shaft 10 is installed in the main body 2 at one end of the screw rod 9, and a magnetostrictive displacement sensor 11 is arranged at the bottom of the stroke shaft 10, a connecting piece 13 is installed at the end of the nut sleeve 8 close to the stroke shaft 10, and a magnetic ring 12 is arranged in the connecting piece 13, and the stroke shaft 10 passes through the magnetic ring 12, a through groove 501 is opened at the end of the protective cover 5 away from the main body 2, and the connecting piece 13 passes through the through groove 501, a mounting plate 14 is fixed to the end of the connecting piece 13 away from the nut sleeve 8, and a connecting component 4 is installed at the end of the mounting plate 14 away from the nut sleeve 8.

[0029] Among them: the output of the magnetostrictive displacement sensor 11 is relative to a fixed reference point. It does not need to be reset when the power is restored after a power outage. Unlike general incremental sensors that need to re-find a reference point such as incremental encoders and incremental grating rulers, it adopts a non-contact magnetic induction technology measurement device. Non-contact measurement does not have mechanical wear and mechanical vibration, which improves the reliability and service life of the sensor.

[0030] Embodiment 2

[0031] Based on the first embodiment, the solution in the first embodiment is further detailed in combination with the following specific working methods. Figures 1 to 6 As shown, see the following description for details:

[0032] As a preferred embodiment, the main body 2 and the protective cover 5 are first clamped and then fixed by bolts, and handles 3 are installed on the top and bottom of the protective cover 5 away from the main body 2; further, they are first clamped and then fixed by bolts, which is convenient for disassembly and assembly, and convenient for inspection and maintenance of the internal structure of the device, and the design is more reasonable.

[0033] As a preferred embodiment, the connecting assembly 4 includes an elastic plastic clip 17, an adjusting piece 18, a rotating sleeve 20, a connecting piece 21 and a central axis 22. The rotating sleeve 20 is arranged inside the elastic plastic clip 17, and a connecting piece 21 is fixed to one end of the rotating sleeve 20. The central axis 22 passes through the elastic plastic clip 17 and the rotating sleeve 20, and the top of the central axis 22 is hinged with the adjusting piece 18; further, the connecting piece 21 is used to connect the clamping arm of the large deformation extensometer. When the elastic plastic clip 17 is relaxed, the rotating sleeve 20 can be rotated in the elastic plastic clip 17, thereby adjusting the direction of the connecting piece 21 to facilitate connection with clamping arms at different angles. When the elastic plastic clip 17 is clamped, the rotating sleeve 20 can be fixed to prevent the connecting piece 21 from rotating during calibration, thereby achieving a better calibration effect.

[0034] As a preferred embodiment, mounting ridges 701 are arranged in parallel at equal intervals on both sides of the base 7, and a magnetic suction groove 601 that matches the shape of the mounting ridge 701 is arranged on one side of the magnetic V-shaped seat 6 close to the base 7; further, the magnetic suction groove 601 is designed so that two gears are provided on the magnetic V-shaped seat 6, which is convenient for adjusting the height of the base 7; the five sides of the magnetic V-shaped seat 6 are magnetic, and one of the sides is provided with a V-shaped groove, so that the device can be magnetically attracted to any magnetic work surface, steel frame, or steel pipe, which is easier to install and fix, and more convenient to use.

[0035] As a preferred embodiment, the elastic plastic clip 17 includes a connecting plate 1701, a clip 1702, a through hole 1703 and a limiting toothed disc 19. The top and bottom of the connecting plate 1701 away from the mounting plate 14 are provided with clips 1702, and the opposite surface of the clip 1702 is fixed with the limiting toothed disc 19. The limiting toothed disc 19 and the clip 1702 are provided with through holes 1703, and the central axis 22 passes through the through hole 1703. The top and bottom of the rotating sleeve 20 are provided with tooth grooves 2001, and the tooth grooves 2001 are respectively engaged with the limiting toothed disc 19; further, the tooth grooves 2001 and the limiting toothed disc 19 are designed so that when the elastic plastic clip 17 is clamped, the tooth grooves 2001 are engaged with the limiting toothed disc 19, and the stability is stronger, and relative rotation between the rotating sleeve 20 and the limiting toothed disc 19 is not easy to occur.

[0036] As a preferred embodiment, a rotating shaft 16 is fixed at the middle position of the mounting plate 14, and the rotating shaft 16 passes through the connecting plate 1701. The end of the rotating shaft 16 is threadedly connected with a fastening cap 15, and the fastening cap 15 is in conflict with the connecting plate 1701; further, the rotating shaft 16 and the fastening cap 15 are designed so that the mounting plate 14 and the elastic plastic clip 17 are rotatably connected, and the angle can be adjusted, that is, the angle of the connecting component 4 is adjustable, and the fastening cap 15 can be used to limit it after adjusting to a suitable angle, which has stronger applicability.

[0037] As a preferred embodiment, a hand-pinch portion 1801 is provided on one side of the adjusting member 18, and an arc transition portion 1802 is provided on the other side of the adjusting member 18. The adjusting member 18 can be rotated within the range of 0°-90°, and the elastic plastic clip 17 is clamped when the adjusting member 18 is rotated to 90°; further, the hand-pinch portion 1801 is designed to make it easier to rotate the adjusting member 18, and the arc transition portion 1802 is designed to enable the adjusting member 18 to rotate along the arc angle, thereby clamping the clip 1702, making the arc transition, and making the rotation more labor-saving.

[0038] As a preferred embodiment, the outer diameter of the central axis 22 is smaller than the inner diameter of the through hole 1703, and an anti-slip sheet 2201 is provided at the bottom of the central axis 22, and the outer diameter of the anti-slip sheet 2201 is larger than the inner diameter of the through hole 1703; further, the outer diameter of the central axis 22 is smaller than the inner diameter of the through hole 1703, which makes it easier for the clip 1702 to open outward at a certain angle, and the design of the anti-slip sheet 2201 can prevent the central axis 22 from detaching from the elastic plastic clip 17, and the design is more reasonable.

[0039] The working process of the utility model is as follows:

[0040] When in use, turn on the power supply, first use the magnetic V-shaped seat 6 to fix the device on the workbench, then adjust the connecting component 4 to a suitable angle, and tighten the fastening cap 15. When the elastic plastic clip 17 is in a relaxed state, rotate the rotating sleeve 20 to adjust the direction of the connecting piece 21, so that the connecting piece 21 is connected to the clamping arm of the large deformation extensometer, and then rotate the adjusting piece 18 to 90°, so that the elastic plastic clip 17 is clamped, the tooth groove 2001 and the limit tooth disc 19 are engaged with each other, and the rotating sleeve 20 is fixed. During calibration, the servo motor 1 works to drive the screw rod 9, the nut sleeve 8, and the magnetic ring 12 to move, and then drive the large The deformation extensometer moves to generate a displacement difference. The magnetostrictive displacement sensor 11 detects the displacement difference and transmits the data to the host. The host uses a touch screen to realize the display and control functions, which can display the displacement of the calibration device, control the setting of the standard displacement, and start, end or pause the measurement. The output of the magnetostrictive displacement sensor 11 is relative to a fixed reference point. It does not need to be reset when the power is restored after a power outage. Before each measurement test, the calibration device is used to drive the large deformation extensometer to move a small displacement to eliminate the error caused by the mechanical gap, thereby achieving the purpose of calibrating and calibrating the large deformation extensometer.

[0041] Finally: The above are only preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A large deformation extensometer calibration device, comprising a main body (2), characterized in that: A protective cover (5) is installed at one end of the main body (2), and a servo motor (1) is fixed on the top of the main body (2); a screw rod (9) is installed inside the main body (2), and the output end of the servo motor (1) is connected to the screw rod (9); a nut sleeve (8) matching the screw rod (9) is sleeved on the screw rod (9); a base (7) is provided at the bottom of the main body (2), and magnetic V-shaped seats (6) are installed at both ends of both sides of the base (7); A stroke shaft (10) is installed in the main body (2) at one end of the screw rod (9), and a magnetostrictive displacement sensor (11) is arranged at the bottom of the stroke shaft (10); a connecting piece (13) is installed at the end of the nut sleeve (8) close to the stroke shaft (10), and a magnetic ring (12) is arranged in the connecting piece (13); the stroke shaft (10) passes through the magnetic ring (12); a through groove (501) is opened at the end of the protective cover (5) away from the main body (2), and the connecting piece (13) passes through the through groove (501); a mounting plate (14) is fixed to the end of the connecting piece (13) away from the nut sleeve (8), and a connecting assembly (4) is installed at the end of the mounting plate (14) away from the nut sleeve (8).

2. A large deformation extensometer calibration device according to claim 1, characterized in that: The main body (2) and the protective cover (5) are first clamped and then fixed by bolts, and handles (3) are installed on the top and bottom of the end of the protective cover (5) away from the main body (2).

3. A large deformation extensometer calibration device according to claim 1, characterized in that: The connecting assembly (4) comprises an elastic plastic clip (17), an adjusting piece (18), a rotating sleeve (20), a connecting piece (21) and a central axis (22); the rotating sleeve (20) is arranged inside the elastic plastic clip (17), and the connecting piece (21) is fixed to one end of the rotating sleeve (20); the central axis (22) passes through the elastic plastic clip (17) and the rotating sleeve (20), and the adjusting piece (18) is hinged on the top of the central axis (22).

4. A large deformation extensometer calibration device according to claim 1, characterized in that: Mounting ridges (701) are arranged in parallel at equal intervals on both sides of the base (7), and a magnetic suction groove (601) matching the shape of the mounting ridges (701) is arranged on one side of the magnetic V-shaped seat (6) close to the base (7).

5. A large deformation extensometer calibration device according to claim 3, characterized in that: The elastic plastic clip (17) comprises a connecting plate (1701), a clip (1702), a through hole (1703) and a limiting toothed disc (19); the top and bottom of the connecting plate (1701) away from the mounting plate (14) are both provided with clips (1702), and the limiting toothed disc (19) is fixed to the opposite surface of the clip (1702); the limiting toothed disc (19) and the clip (1702) are both provided with through holes (1703), and the central axis (22) passes through the through hole (1703); the top and bottom of the rotating sleeve (20) are both provided with tooth grooves (2001), and the tooth grooves (2001) are respectively engaged with the limiting toothed disc (19).

6. A large deformation extensometer calibration device according to claim 1, characterized in that: A rotating shaft (16) is fixed at the middle position of the mounting plate (14), and the rotating shaft (16) passes through the connecting plate (1701). A fastening cap (15) is threadedly connected to the end of the rotating shaft (16), and the fastening cap (15) is in conflict with the connecting plate (1701).

7. A large deformation extensometer calibration device according to claim 3, characterized in that: A hand-gripping portion (1801) is provided on one side of the adjusting member (18), and an arc transition portion (1802) is provided on the other side of the adjusting member (18). The adjusting member (18) can be rotated within a range of 0°-90°, and the elastic plastic clip (17) is clamped when the adjusting member (18) is rotated to 90°.

8. A large deformation extensometer calibration device according to claim 5, characterized in that: The outer diameter of the central axis (22) is smaller than the inner diameter of the through hole (1703), and an anti-slip sheet (2201) is provided at the bottom of the central axis (22), and the outer diameter of the anti-slip sheet (2201) is larger than the inner diameter of the through hole (1703).

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