Vibrating wire strain gauge calibration device

Abstract

The utility model provides a vibrating wire strain gauge calibration device, which comprises a frame body, a driving mechanism, a grating assembly and a control unit, and is characterized in that the frame body is connected with a sliding assembly in a sliding manner, and the frame body and the sliding assembly are provided with clamping pieces for clamping a vibrating wire strain gauge; the driving mechanism comprises a driving piece and a transmission assembly; the grating assembly comprises a grating ruler and a grating head; the control unit is electrically connected with the driving piece, the grating head and the vibrating wire strain gauge; the driving mechanism is used for driving the sliding assembly to move, and the control unit is used for collecting deformation information of the vibrating wire strain gauge and displacement information of the grating head. According to the vibrating wire strain gauge calibration device provided by the utility model, through the cooperative work of the driving mechanism, the grating assembly and the control unit, the deformation quantity of the vibrating wire strain gauge can be accurately controlled, the deformation information and displacement information of the vibrating wire strain gauge can be accurately obtained, the operation efficiency is improved, the influence of manual intervention is reduced, and the calibration accuracy is improved. Therefore, more accurate and reliable calibration is provided for the vibrating wire strain gauge.

Description

Technical Field

[0001] This utility model belongs to the field of instrument calibration technology, specifically relating to a vibrating wire strain gauge calibration device. Background Technology

[0002] A vibrating wire strain gauge is a strain sensor that uses a vibrating wire for measurement. It is widely used in civil engineering, mechanical engineering, and aerospace to measure the strain of structures. Its working principle is based on the relationship between the natural frequency of the vibrating wire and the strain; the strain value is calculated by measuring the change in the frequency of the vibrating wire.

[0003] To ensure measurement accuracy, vibrating wire strain gauges typically require calibration before use. Most existing calibration devices for vibrating wire strain gauges employ manual loading, requiring manual data collection. This is not only inefficient but also prone to introducing human error, affecting the accuracy of the calibration results. Furthermore, some calibration devices use dial indicators as displacement measuring instruments. However, due to installation errors and human reading errors, the accuracy of these instruments cannot be guaranteed, failing to meet the high-precision calibration requirements of vibrating wire strain gauges. Utility Model Content

[0004] This utility model provides a vibrating wire strain gauge calibration device, which can realize automatic control of the vibrating wire strain gauge calibration process, improve operation efficiency, reduce the influence of manual intervention, provide more accurate and reliable calibration for vibrating wire strain gauges, improve calibration quality, and ensure the measurement accuracy and reliability of vibrating wire strain gauges in subsequent use.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a vibrating wire strain gauge calibration device, comprising:

[0006] The frame is slidably connected to a sliding assembly, and the frame and the sliding assembly are respectively provided with clamping parts for clamping the end seat of the vibrating wire strain gauge;

[0007] The drive mechanism includes a drive component connected to the frame and a transmission component connected between the drive component and the sliding assembly;

[0008] A grating assembly, including a grating ruler and a grating head, wherein the grating ruler is connected to the frame and the grating head is connected to the sliding assembly; and

[0009] The control unit is electrically connected to the drive unit, the grating assembly, and the vibrating wire strain gauge.

[0010] The driving mechanism is used to drive the sliding component to move, so as to deform the vibrating wire strain gauge and generate displacement readings of the grating head. The control unit is used to collect the deformation information of the vibrating wire strain gauge and the displacement information of the grating head.

[0011] In one possible implementation, the sliding component includes:

[0012] The first sliding plate is slidably connected to the frame and is used to mount the end seat of the vibrating wire strain gauge;

[0013] The second sliding plate, arranged parallel and spaced apart from the first sliding plate, is used to connect to the drive mechanism; and

[0014] A screw adjustment assembly is connected between the first slide plate and the second slide plate and is used to adjust the distance between the first slide plate and the second slide plate;

[0015] The grating head is connected to the first slide plate.

[0016] In some embodiments, the screw adjustment assembly includes two connecting screws that pass through the first slide plate and the second slide plate respectively. The two connecting screws are located on both sides of the vibrating wire strain gauge. Each side wall of the first slide plate and the side wall of the second slide plate are respectively abutted by a positioning nut. The positioning nut is threaded onto the outer periphery of the connecting screw.

[0017] In one possible implementation, the transmission assembly includes:

[0018] The lead screw is rotatably connected to the frame.

[0019] A nut is connected to the sliding assembly and is threaded onto the outer periphery of the lead screw;

[0020] A first gear is connected to the drive end of the drive component; and

[0021] The second gear is sleeved on the end of the lead screw away from the lead nut and meshes with the first gear.

[0022] In some embodiments, the frame is provided with two parallel guide slides, and the two ends of the first slide and the two ends of the second slide are respectively slidably connected to the two guide slides.

[0023] In some embodiments, the frame includes a base plate and a first upright plate and a second upright plate respectively connected to the base plate, wherein the first upright plate and the second upright plate are arranged in parallel.

[0024] The guide slide rod is connected between the first upright plate and the second upright plate. The first upright plate is used to install the end seat of the vibrating wire strain gauge. The grating ruler is connected between the first upright plate and the second upright plate and is parallel to the guide slide rod.

[0025] In some embodiments, both the first sliding plate and the first upright plate are provided with V-shaped grooves with upward openings. The clamping member is a clamping block connected to the first sliding plate / first upright plate. The clamping block is provided with a V-shaped pressing part that is adapted to the V-shaped groove. The V-shaped groove and the V-shaped pressing part are arranged vertically and vertically to press against the outer periphery of the vibrating wire strain gauge end seat.

[0026] In some embodiments, the clamping member includes:

[0027] The lower card slot is connected to the first slide plate / the frame; and

[0028] The upper card slot is connected to the upper part of the lower card slot;

[0029] The lower and upper clamping seats are respectively provided with opposite openings of semi-grooves, and the two semi-grooves can form a clamping cavity for clamping the end seat of the vibrating wire strain gauge.

[0030] In some embodiments, an arc-shaped plate is coaxially arranged inside the semi-groove, and an elastic element is connected between the arc-shaped plate and the inner peripheral wall of the semi-groove.

[0031] In some embodiments, one end of the upper card holder is hinged to the lower card holder via a hinge, and the other end of the upper card holder is connected to the lower card holder via a fastener.

[0032] The beneficial effects of the vibrating wire strain gauge calibration device provided by this utility model are as follows: This vibrating wire strain gauge calibration device improves operational efficiency by driving the sliding component through a drive mechanism, and also helps to accurately control the deformation of the vibrating wire strain gauge; the use of a grating assembly for displacement measurement, connecting the grating ruler to the frame and the grating head to the sliding assembly, better ensures the consistency of the measurement axis and effectively reduces Abbe error. Simultaneously, the cooperation between the grating ruler and the grating head provides high-precision displacement readings, avoiding errors from manual readings and further improving measurement accuracy; the control unit can collect the deformation information of the vibrating wire strain gauge and the displacement information of the grating head in real time, and perform calculations and storage of the information data, greatly improving the data processing efficiency during the calibration process.

[0033] Compared with existing technologies, the vibrating wire strain gauge calibration device provided by this utility model, through the coordinated work of the drive mechanism, grating assembly and control unit, enables the device to accurately control the deformation of the vibrating wire strain gauge and accurately acquire its deformation information and corresponding displacement information, thereby improving operating efficiency and reducing the influence of manual intervention. This provides more accurate and reliable calibration for vibrating wire strain gauges, significantly improving the calibration process of vibrating wire strain gauges, and is particularly suitable for industrial and scientific research fields that require high precision and large amount of data processing. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of a vibrating wire strain gauge in the prior art;

[0036] Figure 2 A schematic diagram of a vibrating wire strain gauge calibration device provided in an embodiment of this utility model;

[0037] Figure 3 This is an embodiment of the present utility model. Figure 2 Enlarged structural diagram of section A in the middle;

[0038] Figure 4 A schematic diagram of another embodiment of a vibrating wire strain gauge calibration device provided by this utility model;

[0039] Figure 5 This is an embodiment of the present utility model. Figure 4 A front sectional view of the clamping component;

[0040] Figure 6 This is an embodiment of the present utility model. Figure 4 A side sectional view of the clamping component.

[0041] The following are the labeling elements in the figure:

[0042] 1. Frame; 11. First slide plate; 111. V-groove; 12. Base plate; 13. First upright plate; 14. Second upright plate; 15. Guide slide rod; 16. Second slide plate; 17. Connecting screw; 171. Positioning nut; 18. Linear bearing; 19. Reinforcing rod; 2. Drive mechanism; 21. Drive component; 22. Transmission assembly; 221. Lead screw; 222. Lead nut; 223. First gear; 224. Second gear; 3. Grating assembly; 31. Grating ruler; 32. Grating head; 4. First microcontroller; 5. Second microcontroller; 6. Host computer; 7. Clamping component; 71. V-shaped pressing part; 72. Lower clamping seat; 721. Half groove; 73. Upper clamping seat; 74. Arc plate; 75. Elastic component; 76. Gasket; 10. Vibrating wire strain gauge; 101. End seat; 102. Protective tube. Detailed Implementation

[0043] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0044] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0045] Please refer to the following: Figures 1 to 6This invention provides a vibrating wire strain gauge calibration device. The vibrating wire strain gauge calibration device includes a frame 1, a drive mechanism 2, a grating assembly 3, and a control unit. The frame 1 is slidably connected to a sliding assembly, and clamping members 7 for holding the vibrating wire strain gauge end seat 101 are respectively provided on the frame 1 and the sliding assembly. The drive mechanism 2 includes a drive member 21 connected to the frame 1 and a transmission assembly 22 connected between the drive member 21 and the sliding assembly. The grating assembly 3 includes a grating ruler 31 and a grating head 32. The grating ruler 31 is connected to the frame 1, and the grating head 32 is connected to the sliding assembly. The control unit is electrically connected to the drive member 21, the grating assembly 3, and the vibrating wire strain gauge 10. The drive mechanism 2 drives the sliding assembly to move, causing the vibrating wire strain gauge 10 to deform and the grating head 32 to generate displacement readings. The control unit collects the deformation information of the vibrating wire strain gauge 10 and the displacement information of the grating head 32.

[0046] This embodiment provides a vibrating wire strain gauge calibration device. The drive mechanism 2 moves the sliding assembly, improving operational efficiency and facilitating precise control of the deformation of the vibrating wire strain gauge 10. Displacement measurement is performed using a grating assembly 3, with the grating ruler 31 connected to the frame 1 and the grating head 32 connected to the sliding assembly. This better ensures the consistency of the measurement axis, effectively reducing Abbe error. Simultaneously, the cooperation between the grating ruler 31 and the grating head 32 provides high-precision displacement readings, avoiding errors from manual readings and further improving measurement accuracy. The control unit can collect the deformation information of the vibrating wire strain gauge 10 and the displacement information of the grating head 32 in real time, and perform calculations and storage of the data, greatly improving the data processing efficiency during calibration.

[0047] Compared with the prior art, the vibrating wire strain gauge calibration device provided by this utility model, through the coordinated work of the drive mechanism 2, the grating assembly 3 and the control unit, enables the device to accurately control the deformation of the vibrating wire strain gauge 10 and accurately acquire its deformation information and corresponding displacement information, thereby improving operating efficiency and reducing the influence of manual intervention. This provides more accurate and reliable calibration for the vibrating wire strain gauge 10, significantly improving the calibration process of the vibrating wire strain gauge 10, and is particularly suitable for industrial and scientific research fields that require high precision and large amount of data processing.

[0048] It should be noted that the vibrating wire strain gauge 10 typically consists of two end seats 101, a stainless steel protective tube 102, a signal transmission cable, a vibrating wire, and an excitation electromagnetic coil. In use, the two end seats 101 are securely connected to the structure being measured. When the stress inside the structure changes, the strain gauge synchronously senses the deformation. This deformation is transmitted through the end seats 101 to the vibrating wire, transforming into a change in wire stress, thereby altering the wire's vibration frequency. The electromagnetic coil excites the vibrating wire and measures its vibration frequency. The frequency signal is transmitted via cable to a reading device, allowing the measurement of the strain inside the structure.

[0049] Specifically, in this embodiment, the control unit includes a host computer 6 and a first microcontroller 4 and a second microcontroller 5 electrically connected to the host computer 6. The first microcontroller 4 is electrically connected to the drive unit 21, and the second microcontroller 5 is electrically connected to the grating head 32 and the vibrating wire strain gauge 10, respectively. The drive unit 21 is a servo motor, and the driver of the servo motor uses pulse control, which facilitates electrical connection with the first microcontroller 4 to realize automated control of the drive mechanism 2. Both the first microcontroller 4 and the second microcontroller 5 are equipped with wireless transmission modules to facilitate signal transmission with the host computer 6. The wires leading out of the vibrating wire strain gauge 10 are connected to a frequency reading instrument (not shown in the figure). The second microcontroller 5 reads the data from the frequency reading instrument through an RS485 module and then sends the data to the host computer 6 according to the TCP protocol. At the same time, the second microcontroller 5 sends the data from the grating head 32 through the UART serial port to the host computer 6 according to the TCP protocol.

[0050] When calibrating the vibrating wire strain gauge 10 using this device, firstly, the two end seats 101 of the vibrating wire strain gauge 10 are installed on the sliding assembly and the frame 1 respectively. The grating ruler 31 is adjusted to ensure that the grating ruler 31 is parallel to the sliding direction of the sliding assembly to eliminate Abbe error. Then, two microcontrollers are started simultaneously. At this time, the second microcontroller 5 collects the initial reading of the grating ruler 31 and the frequency data from the frequency reader, and sends the data to the host computer 6. When the host computer 6 receives a complete set of grating ruler 31 readings and frequencies, it sends a command to the first microcontroller 4 to start the drive component 21, which drives the sliding assembly to move linearly through the transmission component 22, thereby causing the vibrating wire strain gauge 10 to deform. Two seconds after the host computer 6 sends the command to the first microcontroller 4, it sends a command to the second microcontroller 5, which then collects a set of data from the current detection point and sends it. This cycle is repeated to collect a total of 11 sets of data. Afterward, the drive mechanism 2 drives the sliding assembly to move in reverse stepwise motion, and another 11 sets of reverse data are collected. Finally, the host computer 6 performs fitting, repeatability calculation, and comparison of the squares of the displacement and frequency values ​​in each set of data to complete the calibration operation.

[0051] In some embodiments, the sliding component described above may employ, for example... Figure 2 The structure shown. See also Figure 2 The sliding assembly includes a first sliding plate 11, a second sliding plate 16, and a screw adjustment assembly. The first sliding plate 11 is slidably connected to the frame 1 and is used to install the end seat 101 of the vibrating wire strain gauge 10. The second sliding plate 16 is arranged parallel to the first sliding plate 11 and is used to connect to the drive mechanism 2. The screw adjustment assembly is connected between the first sliding plate 11 and the second sliding plate 16 and is used to adjust the distance between the first sliding plate 11 and the second sliding plate 16. The grating head 32 is connected to the first sliding plate 11.

[0052] In this embodiment, the sliding assembly is configured as a combination of the first sliding plate 11 and the second sliding plate 16. This helps to prevent the vibration generated by the drive mechanism 2 during operation from being transmitted to the vibrating wire strain gauge 10 and affecting the measurement results. Simultaneously, the first sliding plate 11 and the second sliding plate 16 are connected by a screw adjustment assembly, allowing the distance between them to be adjusted according to the actual application. This, in turn, allows for adjustment of the distance between the first sliding plate 11 and the frame 1, thus accommodating the installation requirements of vibrating wire strain gauges 10 of different lengths.

[0053] In some embodiments, the screw adjusting assembly described above may employ, for example... Figure 2 The structure shown. See also Figure 2 The screw adjustment assembly includes two connecting screws 17 that pass through the first slide plate 11 and the second slide plate 16 respectively. The two connecting screws 17 are located on both sides of the vibrating wire strain gauge 10. The two side walls of the first slide plate 11 and the two side walls of the second slide plate 16 are respectively abutted by positioning nuts 171. The positioning nuts 171 are threaded onto the outer periphery of the connecting screws 17.

[0054] By simultaneously rotating the positioning nuts 171 on the two connecting screws 17, the axial position of the positioning nuts 171 on the connecting screws 17 can be adjusted synchronously, thereby adjusting the installation distance between the first slide plate 11 and the second slide plate 16. This not only accommodates the installation requirements of vibrating wire strain gauges 10 of different lengths, but also provides sufficient operating space for the installation of the drive mechanism 2.

[0055] In some embodiments, the transmission component 22 may employ, for example... Figure 2 The structure shown. See also Figure 2 The transmission assembly 22 includes a lead screw 221, a lead screw nut 222, a first gear 223, and a second gear 224. The lead screw 221 is rotatably connected to the frame 1. The lead screw nut 222 is connected to the sliding assembly and is threaded onto the outer circumference of the lead screw 221. The first gear 223 is connected to the driving end of the driving member 21. The second gear 224 is sleeved on the end of the lead screw 221 away from the lead screw nut 222 and meshes with the first gear 223.

[0056] In this embodiment, a reducer is also connected between the drive component 21 and the first gear 223. The first gear 223 is a pinion, and the second gear 224 is a large gear. The meshing of the first gear 223 and the second gear 224 further reduces the speed. Meanwhile, gear transmission has the characteristics of high transmission efficiency and strong load-bearing capacity, ensuring that the power of the drive component 21 can be stably and efficiently transmitted to the lead screw 221. Through the threaded engagement between the lead screw 221 and the nut 222, and the sliding connection between the sliding assembly and the frame 1, the rotational motion of the lead screw 221 is precisely converted into the linear motion of the sliding assembly. This transmission method has advantages such as simple structure, high transmission accuracy, and smooth operation.

[0057] Preferably, the lead screw 221 and the lead screw nut 222 adopt the structure of ball screw, which can increase the smoothness of the transmission process and ensure that the vibrating wire strain gauge 10 is stably stretched or compressed.

[0058] Furthermore, the nut 222 is fixed on the second slide plate 16. The drive member 21 can drive the lead screw 221 to rotate through the meshing of the first gear 223 and the second gear 224, and drive the second slide plate 16 to move through the nut 222, thereby driving the first slide plate 11 to move linearly through the screw adjustment assembly, so as to realize the stretching or compression of the vibrating wire strain gauge 10.

[0059] It should be noted that setting the sliding component as a combination of the first sliding plate 11 and the second sliding plate 16 also facilitates the coaxial setting of the lead screw 221 and the vibrating wire strain gauge 10, so that the force applied by the lead screw 221 can be transmitted along the central axis of the vibrating wire strain gauge 10, avoiding force eccentricity or tilting, thereby making the force distribution of each part of the vibrating wire strain gauge 10 relatively uniform, which helps to ensure the reliability of the measurement data.

[0060] Optionally, the frame 1 is provided with two parallel guide slide rods 15, and the two ends of the first slide plate 11 and the two ends of the second slide plate 16 are respectively slidably connected to the two guide slide rods 15.

[0061] Specifically, two guide rods 15 are respectively set close to the two sides of the frame 1, which on the one hand provide a reliable sliding mounting carrier for the first slide plate 11 and the second slide plate 16, and on the other hand help to increase the overall stability of the frame 1.

[0062] Furthermore, both the first slide plate 11 and the second slide plate 16 are slidably engaged with the guide rod 15 via linear bearings 18. The linear bearings 18 provide precise guidance, allowing the first slide plate 11 and the second slide plate 16 to perform high-precision linear motion along the guide rod 15, reducing deviations and wobbling during movement and helping to optimize the stress conditions of the vibrating wire strain gauge 10. Simultaneously, since the linear bearings 18 typically employ rolling friction internally, they effectively reduce the frictional resistance of the first slide plate 11 / second slide plate 16 during sliding, reducing wear on the guide rod 15 and extending the service life of the first slide plate 11, the second slide plate 16, and the guide rod 15.

[0063] In some embodiments, the frame 1 described above may be as follows: Figure 2 The structure shown. See also Figure 2 The frame 1 includes a base plate 12 and a first upright plate 13 and a second upright plate 14 respectively connected to the base plate 12. The first upright plate 13 and the second upright plate 14 are arranged in parallel. A guide slide rod 15 is connected between the first upright plate 13 and the second upright plate 14. The first upright plate 13 is used to install the end seat 101 of the vibrating wire strain gauge 10. The grating ruler 31 is connected between the first upright plate 13 and the second upright plate 14 and is parallel to the guide slide rod 15.

[0064] The guide slide 15 and the grating ruler 31 are both connected between the first vertical plate 13 and the second vertical plate 14, providing sufficient measurement stroke for the first slide plate 11. It should be noted that when installing the grating ruler 31, it is essential to ensure that the grating ruler 31 is parallel to the guide slide 15 to eliminate Abbe error.

[0065] Specifically, the lead screw 221 is rotatably connected to the second vertical plate 14 via a bearing seat, and the second gear 224 is connected to the outer end of the lead screw 221, i.e., located on the outer side of the second vertical plate 14. Thus, both the drive component 21 and the first gear 223 are located on the outer side of the second vertical plate 14, making the overall structure of the device more reasonable. More specifically, the drive component 21 is connected to the base plate 12 via a mounting bracket to accommodate the meshing installation requirements of the first gear 223 and the second gear 224.

[0066] For example, a reinforcing rod 19 is also connected between the first upright plate 13 and the second upright plate 14, and the reinforcing rod 19 is arranged parallel to the guide slide rod 15. The reinforcing rod 19 is located below the guide slide rod 15, and the reinforcing rod 19 can form an effective support connection between the first upright plate 13 and the second upright plate 14, increasing the overall rigidity of the frame 1 structure and providing a reliable mounting carrier for the drive mechanism 2 and the vibrating wire strain gauge 10.

[0067] In some embodiments, the clamping member 7 may be adopted as follows: Figure 2 and Figure 3 The structure shown. See also Figure 2 and Figure 3 Both the first sliding plate 11 and the first upright plate 13 are provided with V-shaped grooves 111 with openings facing upwards. The clamping member 7 is a clamping block connected to the first sliding plate 11 / first upright plate 13. The clamping block is provided with a V-shaped pressing part 71 that is adapted to the V-shaped groove 111. The V-shaped groove 111 and the V-shaped pressing part 71 are arranged vertically and vertically to press against the outer periphery of the vibrating wire strain gauge end seat 101.

[0068] In this embodiment, the clamping block is bolted to the top of the first sliding plate 11 / first upright plate 13. When installing the vibrating wire strain gauge 10, the end seat 101 of the vibrating wire strain gauge 10 is placed in the V-groove 111, and then the clamping block is installed so that the V-shaped pressing part 71 presses against the end seat 101 of the vibrating wire strain gauge, thereby achieving reliable installation of the vibrating wire strain gauge 10.

[0069] The V-groove 111 and the V-shaped pressing part 71 provide four-point support for the vibrating wire strain gauge end holder 101, which helps the clamping part 7 to adapt to the installation of vibrating wire strain gauges 10 of different sizes. Furthermore, both the V-groove 111 and the V-shaped pressing part 71 are provided with anti-slip textures to prevent the vibrating wire strain gauge end holder 101 from slipping under force, increasing the stability of the vibrating wire strain gauge 10 installation and helping to improve calibration accuracy.

[0070] For a modified embodiment of the clamping member 7 described above, see [link to relevant documentation]. Figure 4 , Figure 5 and Figure 6 The clamping member 7 includes a lower clamping seat 72 and an upper clamping seat 73. The lower clamping seat 72 is connected to the first slide plate 11 / frame 1; the upper clamping seat 73 is connected above the lower clamping seat 72. The lower clamping seat 72 and the upper clamping seat 73 are respectively provided with opposite openings of half grooves 721. The two half grooves 721 can form a clamping cavity for clamping the vibrating wire strain gauge end seat 101.

[0071] In this embodiment, a clamping cavity is formed by two semi-grooves 721, and a stable clamping of the vibrating wire strain gauge end seat 101 is achieved through a reliable connection between the upper clamping seat 73 and the lower clamping seat 72. The clamping member 7 is configured as a separate structure of the upper clamping seat 73 and the lower clamping seat 72 to allow the vibrating wire strain gauge end seat 101 to be inserted into the semi-grooves 721. The two sidewalls of the semi-grooves 721 effectively prevent axial slippage of the vibrating wire strain gauge 101 during deformation, avoiding displacement errors and helping to ensure the accuracy of calibration.

[0072] Specifically, the lower bracket 72 can be fixed to the first slide plate 11 or the first upright plate 13 by welding or screw connection, and the upper bracket 73 and the lower bracket 72 can be connected by bolts for easy disassembly and assembly. The inner sidewalls of the upper bracket 73 and the lower bracket 72 are also provided with through grooves that communicate with the semi-groove 721 to allow the protective tube 102 of the vibrating wire strain gauge 10 to pass through.

[0073] Preferably, the groove 721 has anti-slip protrusions on its groove periphery to prevent the vibrating wire strain gauge end seat 101 from slipping in the clamping cavity, thereby increasing the stability of the vibrating wire strain gauge 10 during installation.

[0074] Furthermore, an arc-shaped plate 74 is coaxially provided inside the semi-groove 721, and an elastic element 75 is connected between the arc-shaped plate 74 and the inner peripheral wall of the semi-groove 721. The arc-shaped plate 74 connected by the elastic element 75 can elastically press against the end seat 101 of the vibrating wire strain gauge 10, so that the semi-groove 721 can accommodate vibrating wire strain gauges 10 of different sizes.

[0075] Specifically, the elastic element 75 is a spring, and the arc-shaped plate 74 itself is also elastic, which can better fit against the peripheral wall of the vibrating wire strain gauge end seat 101, increase the pressure area, and improve the stability of the installation. Multiple arc-shaped plates 74 can be arranged circumferentially, and each arc-shaped plate 74 is connected to at least one elastic element 75 between itself and the semi-groove 721.

[0076] It should be noted that different vibrating wire strain gauges 10 have different end-mount 101 dimensions. When the outer diameter of the end-mount 101 changes, the axial thickness of the end-mount 101 usually also changes. The elastic element 75 and the arc plate 74 can adapt to changes in the outer diameter of the end-mount 101. For changes in the thickness of the end-mount 101, a shim 76 can be added between the two sidewalls of the half-groove 721 to reliably position the half-groove 721 on the axial direction of the end-mount 101. Alternatively, a spring can be added between the shim 76 and the sidewall of the groove to ensure that end-mounts 101 of different sizes can be stably engaged between the arc plate 74 and the shim 76, thereby achieving reliable installation of the vibrating wire strain gauge 10.

[0077] Optionally, one end of the upper card holder 73 is hinged to the lower card holder 72 via a hinge, and the other end of the upper card holder 73 is connected to the lower card holder 72 via a fastener.

[0078] When installing the vibrating wire strain gauge 10, lift the upper retaining seat 73, causing it to flip upwards around the hinge and open. Insert the end plate 101 of the vibrating wire strain gauge 10 into the semi-groove 721 of the lower retaining seat 72. Then, flip the upper retaining seat 73 downwards, so that the semi-groove 721 of the upper retaining seat 73 fits over the end plate 101 of the vibrating wire strain gauge. Simultaneously, tighten the fasteners to connect the upper retaining seat 73 and the lower retaining seat 72 together, thus achieving quick installation of the vibrating wire strain gauge end plate 101. The installation operation of the vibrating wire strain gauge 10 is simplified by the interaction of the hinge and fasteners, improving measurement efficiency.

[0079] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vibrating wire strain gauge calibration device, characterized by, The utility model relates to a kind of vibration string strain gauge displacement measuring device, including: Frame body (1), slidingly connected with sliding assembly, the frame body (1) and the sliding assembly are equipped with clamping member (7) for clamping vibration string strain gauge end seat (101) respectively; Driving mechanism (2), including driving member (21) connected on the frame body (1) and transmission assembly (22) connected between the driving member (21) and the sliding assembly; Optical grating assembly (3), including grating ruler (31) and grating head (32), the grating ruler (31) is connected on the frame body (1), and the grating head (32) is connected on the sliding assembly; And Control unit, electrically connected with the driving member (21), the grating head (32) and vibration string strain gauge (10); Wherein, the driving mechanism (2) is used to drive the sliding assembly to move, so that vibration string strain gauge (10) is deformed, and the grating head (32) generates displacement reading, and the control unit is used to collect the deformation information of vibration string strain gauge (10) and the displacement information of the grating head (32).

2. A vibrating wire strain gage calibration device as defined in claim 1 wherein, The sliding assembly includes: First slide plate (11), slidingly connected on the frame body (1), for installing vibration string strain gauge (10) end seat (101); Second slide plate (16), parallel interval is arranged with the first slide plate (11), for being connected with the driving mechanism (2);And Screw rod adjusting assembly, connected between the first slide plate (11) and the second slide plate (16), for adjusting the distance between the first slide plate (11) and the second slide plate (16); Wherein, the grating head (32) is connected on the first slide plate (11).

3. A vibrating wire strain gage calibration device as defined in claim 2 wherein, The screw rod adjusting assembly includes two connection screw rods (17) respectively penetrating the first slide plate (11) and the second slide plate (16) are arranged, two the connection screw rod (17) is located at both sides of vibration string strain gauge (10) respectively, and both sides wall of the first slide plate (11) and both sides wall of the second slide plate (16) are all one-to-one abutted with positioning nut (171), and the positioning nut (171) is threadedly sleeved on the outer periphery of the connection screw rod (17).

4. A vibrating wire strain gage calibration device as defined in claim 1 wherein, The transmission assembly (22) includes: Lead screw (221), rotatably connected on the frame body (1); Nut (222), connected on the sliding assembly, and threadedly sleeved on the outer periphery of the lead screw (221); First gear (223), connected on the driving end of the driving member (21);And Second gear (224), sleeved on the end of the lead screw (221) away from the nut (222), and meshed with the first gear (223).

5. A vibrating wire strain gage calibration device as defined in claim 2 wherein, Two parallel guide slide rods (15) are arranged on the frame body (1), and both ends of the first slide plate (11) and both ends of the second slide plate (16) are slidably connected on the two guide slide rods (15) respectively.

6. A vibrating wire strain gage calibration device as defined in claim 5 wherein, The frame body (1) includes bottom plate (12) and first vertical plate (13) and second vertical plate (14) connected on the bottom plate (12) respectively, and the first vertical plate (13) and the second vertical plate (14) are arranged in parallel; The guide slide rod (15) is connected between the first vertical plate (13) and the second vertical plate (14), the first vertical plate (13) is used for mounting the end seat (101) of the vibrating wire strain gauge (10), and the grating ruler (31) is connected between the first vertical plate (13) and the second vertical plate (14) and is parallel to the guide slide rod (15).

7. A vibrating wire strain gage calibration device as defined in claim 6 wherein, The first slide plate (11) and the first vertical plate (13) are each provided with an upwardly-open V-shaped groove (111), the clamping piece (7) is a clamping block connected to the first slide plate (11) / the first vertical plate (13), the clamping block is provided with a V-shaped abutting portion (71) matched with the V-shaped groove (111), and the V-shaped groove (111) and the V-shaped abutting portion (71) are arranged in correspondence with each other and are used for abutting against the outer periphery of the vibrating wire strain gauge end seat (101).

8. A vibrating wire strain gage calibration device as defined in claim 2 wherein, The clamping piece (7) comprises: a lower clamping seat (72) connected to the first slide plate (11) / the frame body (1); and an upper clamping seat (73) connected above the lower clamping seat (72); wherein the lower clamping seat (72) and the upper clamping seat (73) are respectively provided with half grooves (721) with opposite openings, and the two half grooves (721) can be enclosed to form a clamping cavity for clamping the vibrating wire strain gauge end seat (101).

9. A vibrating wire strain gage calibration device as defined in claim 8 wherein, An arc-shaped plate (74) is coaxially arranged in the half groove (721), and an elastic member (75) is connected between the arc-shaped plate (74) and the inner peripheral wall of the half groove (721).

10. A vibrating wire strain gage calibration device as defined in claim 8 wherein, One end of the upper clamping seat (73) is hingedly connected to the lower clamping seat (72), and the other end of the upper clamping seat (73) is connected to the lower clamping seat (72) through a fastener.

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