Automatic calibration device for displacement monitoring instrument

Abstract

The utility model provides an automatic calibration device for a displacement monitoring instrument, and relates to the field of dam safety monitoring. Comprising a linear moving module, the linear moving module is arranged on a bottom plate, and a grating ruler sensor is arranged on one side of the linear moving module in the axial direction of the linear moving module; the fixed base is fixed to the bottom plate and located at one end of the linear moving module, and a first clamp is arranged at the top of the fixed base; the moving base is slidably connected to the linear moving module through a sliding block assembly, a second clamp is arranged at the top of the moving base, and a sensor connector is clamped by the second clamp; a main scale of the grating scale sensor is fixed on the bottom plate, and a reading head of the grating scale sensor is connected with the sliding block assembly; the central control module is in communication connection with the linear moving module and the grating ruler sensor. According to the invention, the defects of complexity, complexity, long time consumption and low efficiency in the calibration process of the displacement meter at present can be solved, and the whole intelligent, light and efficient calibration process of the displacement monitoring instrument is realized.

Description

Technical Field

[0001] The utility model relates to the field of dam safety monitoring, and more specifically, to an automatic calibration device for displacement monitoring instruments. Background Art

[0002] Displacement monitoring instruments are widely used in the deformation monitoring of dam safety. According to different monitoring objects and physical quantities, they can be divided into various types such as displacement gauges, crack gauges, dislocation gauges, etc. According to different sensing principles, there are vibrating wire type, differential resistance type, potentiometer type, capacitive type, etc. The basic structure of the appearance of displacement monitoring instruments consists of a rod-shaped housing and a telescopic measuring rod placed inside the housing. During installation, the measured object is fixed to the rod-shaped housing and the telescopic end measuring rod respectively. When there is a displacement change between the measured structures, it causes the telescopic measuring rod to undergo corresponding telescopic changes inside the rod-shaped housing, generating a corresponding mathematical conversion relationship (generally a linear relationship) between the displacement amount and the output signal, which is the working principle of displacement monitoring instruments.

[0003] In order to ensure that displacement monitoring instruments can reflect real and reliable displacement changes in engineering applications, they should be calibrated by the manufacturer before leaving the factory to provide the relationship formula and corresponding coefficients between the signal measured value and the displacement amount. At the same time, relevant technical standards stipulate that they should also be sent to the measurement unit for re-calibration within 6 months before burial and installation to review their performance and coefficients.

[0004] At present, the calibration work of displacement sensors mostly uses a handwheel type displacement calibration table with a digital display scale as the metrological standard instrument to give displacement changes, and at the same time, an artificial reading instrument is used to measure the measured value of the displacement sensor. By recording, fitting the measured value relationship, and calculating the corresponding parameters, the calibration process is realized. This non-automatic calibration equipment and work process not only takes time and effort and has low efficiency, but also is not conducive to the data management needs of manufacturers or metrological departments. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an automatic calibration device for displacement monitoring instruments, which can solve the problems of complexity, long time consumption, and low efficiency in the calibration process of displacement gauges in current engineering, and realize the whole process of intelligent, portable, and efficient calibration / rate determination of displacement monitoring instruments.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0007] An automatic calibration device for displacement monitoring instruments, comprising:

[0008] A linear motion module, which is arranged on the bottom plate, and a grating scale sensor is arranged along the axial direction on one side of the linear motion module;

[0009] Fixed base, the fixed base is fixed to the bottom plate and located at one end of the linear motion module, and a first fixture is provided on the top of the fixed base;

[0010] Moving base, the moving base is slidably connected to the linear motion module through a slider assembly, a second fixture is provided on the top of the moving base, and a sensor connector is clamped by the second fixture; the main scale of the grating scale sensor is fixed to the bottom plate, and the reading head of the grating scale sensor is connected to the slider assembly;

[0011] Central control module, the central control module is communicatively connected to the linear motion module and the grating scale sensor respectively, and the central control module is used to receive control instructions from the terminal, receive measurement data of the grating scale sensor, and control the operation of the linear motion module.

[0012] Further, in the present utility model, a fixing plate is provided along the axial direction on the side of the linear motion module opposite to the grating sensor, Hall proximity switches are provided at both ends of the fixing plate, a magnet is provided on one side of the slider assembly, and the magnet and the Hall proximity switches are located on the same horizontal plane.

[0013] Further, in the present utility model, the fixing plate is provided with a strip-shaped hole, and the two Hall proximity switches are respectively inserted through both ends of the strip-shaped hole.

[0014] Further, in the present utility model, the linear motion module includes a servo motor and a lead screw module, the lead screw module is arranged on the bottom plate, and the servo motor is drivingly connected to one end of the lead screw module.

[0015] Further, in the present utility model, there are two fixed bases, the two fixed bases are respectively arranged at both ends of the bottom plate, and both ends of the fixing plate are respectively connected to the two fixed bases.

[0016] Further, in the present utility model, a plurality of first limiting grooves connected in sequence are provided along the length direction on the tops of the fixed base and the moving base; both the first fixture and the second fixture include a fixture block and an adjustable buckle, a plurality of second limiting grooves opposite to the first limiting grooves are provided on one side of the fixture block facing the fixed base or the moving base, and the first limiting grooves and the second limiting grooves are used for limiting displacement monitoring instruments;

[0017] There are a plurality of adjustable buckles, the plurality of adjustable buckles are respectively arranged on two pairs of both sides at both ends of the fixture block, and hooks adapted to be hooked with the adjustable buckles are respectively provided on the opposite sides at both ends of the fixed base and the moving base.

[0018] Further, in the present utility model, both the first limiting groove and the second limiting groove are V-shaped grooves, and a plurality of V-shaped strips are arranged at intervals along the width direction of the fixture block on the inner wall of the second limiting groove and / or the first limiting groove.

[0019] Further, in the present utility model, the fixture block is respectively provided with positioning holes opposite to the fixed base and the moving base.

[0020] Further, in the present utility model, the slider assembly includes a driving slider and a connecting plate. The driving slider is threadedly connected to the lead screw module. The connecting plate is fixed to the top of the driving slider, and the moving base is mounted on the top of the connecting plate.

[0021] Further, in the present utility model, one end of the sensor connector is provided with a threaded interface adapted to be connected to a displacement monitoring instrument.

[0022] The present utility model has at least the following advantages or beneficial effects:

[0023] In the present utility model, a linear movement module is arranged on the bottom plate. The linear movement module drives the slider assembly to perform linear movement, and the slider assembly drives the moving base to perform linear movement. By providing a fixed base and a moving base, and respectively providing a first fixture and a second fixture on their tops, the fixed end of the displacement monitoring instrument is clamped between the fixed base and the first fixture, the telescopic end of the displacement monitoring instrument is connected to the sensor connector, and the sensor connector is clamped between the moving base and the second fixture. The telescopic end of the displacement monitoring instrument is telescoped by the movement of the moving base. The reading head of the grating sensor moves with the movement of the slider assembly, and the scale value on the main scale is read in real time during the movement and transmitted back to the central control module. The central control module receives the control instruction and controls the start and stop of the linear movement module. This application can solve the disadvantages of complexity, time-consuming, and low efficiency in the calibration process of displacement gauges in current projects, and realize the whole process of intelligent, portable, and efficient calibration / ratification of displacement monitoring instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic diagram of the overall structure of the automatic calibration device for displacement monitoring instruments provided by the embodiment of the present application;

[0026] Figure 2Schematic top view structure diagram of the automatic calibration device for displacement monitoring instruments provided by the embodiments of the present application;

[0027] Figure 3 Schematic structure diagram of the fixture block provided by the embodiments of the present application;

[0028] Figure 4 Schematic structure diagram of the sensor connector provided by the embodiments of the present application.

[0029] Icons: 1. Base plate; 21. Servo motor; 22. Lead screw module; 3. Fixed base; 31. Through hole; 4. Moving base; 41. Transmission slider; 42. Connecting plate; 43. Magnet; 51. Main scale; 52. Reading head; 6. Fixed plate; 61. Strip hole; 7. Hall proximity switch; 81. First limiting groove; 82. Second limiting groove; 83. Fixture block; 84. Adjustable clamp; 85. Hook; 86. V-shaped strip; 87. Positioning hole; 9. Sensor connector; 91. Threaded interface. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] Embodiment

[0033] Please refer to Figures 1-4 , which shows the schematic structure diagram of the automatic calibration device for displacement monitoring instruments in the embodiments of the present utility model;

[0034] The present embodiment provides an automatic calibration device for displacement monitoring instruments, including:

[0035] A linear movement module is provided on the base plate 1, and a grating scale sensor is provided along the axial direction on one side of the linear movement module;

[0036] A fixed base 3 is fixed to the base plate 1 and is located at one end of the linear movement module. A first fixture is provided on the top of the fixed base 3;

[0037] The moving base 4 is slidably connected to the linear moving module through a slider assembly. A second fixture is provided on the top of the moving base 4, and the second fixture holds the sensor connector 9. The main scale 51 of the grating scale sensor is fixed to the bottom plate 1, and the reading head 52 of the grating scale sensor is connected to the slider assembly.

[0038] The central control module is communicatively connected to the linear moving module and the grating scale sensor respectively. The central control module is configured to receive control instructions from the terminal, receive measurement data from the grating scale sensor, and control the operation of the linear moving module.

[0039] Next, a further description will be given of an automatic calibration device for a displacement type monitoring instrument according to this exemplary embodiment.

[0040] In some embodiments of the present application, the above-mentioned linear moving module includes a servo motor 21 and a lead screw module 22. The lead screw module 22 is disposed on the bottom plate 1. The servo motor 21 is drivingly connected to one end of the lead screw module 22. The lead screw module 22 is driven by the servo motor 21 to perform a linear motion. The servo motor 21 is communicatively connected to the central control module, and the start and stop of the servo motor 21 are controlled by the central control module.

[0041] In some embodiments of the present application, the above-mentioned fixed base 3 is fixed to the bottom plate 1 and is located at one end of the linear moving module. A through hole 31 for the linear moving module to pass through is formed at the bottom of the fixed base 3, so as to increase the adjustment range of the distance between the fixed base 3 and the moving base 4. A first fixture is provided on the top of the fixed base 3. The above-mentioned moving base 4 is slidably connected to the linear moving module through a slider assembly. A second fixture is provided on the top of the moving base 4, and the second fixture holds the sensor connector 9. The main scale 51 of the grating scale sensor is fixed to the bottom plate 1, and the reading head 52 of the grating scale sensor is connected to the slider assembly.

[0042] The fixed end of the displacement type sensor to be measured is fixed by the fixed base 3 and the first fixture, and the telescopic end is fixed by the moving base 4, the second fixture, and the sensor connector 9. Under the control of the central control module, the servo motor 21 drives the linear moving module to drive the moving base 4 to move, thereby driving the displacement type sensor to generate a linear displacement. The scale value on the main scale 51 of the grating scale is read in real time by the grating scale reading head 52 and transmitted back to the central control module. The central control module controls the start and stop of the servo motor 21 according to the data provided by the grating scale sensor and the built-in algorithm, thereby completing the automatic calibration of the displacement type sensor. And the present application adopts a grating scale device to form a closed-loop measurement, reducing the mechanical error existing in the measurement process of the servo motor 21.

[0043] In some embodiments of the present application, a fixing plate 6 is provided along the axial direction on the side of the linear movement module opposite to the grating sensor. Hall proximity switches 7 are respectively provided at both ends of the fixing plate 6. A magnet 43 is provided on one side of the slider assembly. The magnet 43 and the Hall proximity switch 7 are located on the same horizontal plane. Among them, the Hall proximity switch 7 is connected to the central control module. During the automatic calibration process, the magnet 43 on the side of the slider assembly moves with it. When the magnet 43 approaches the Hall proximity switch 7, the Hall proximity switch 7 is triggered to act. When the central control module receives the action signal of the Hall proximity switch 7, it will immediately stop the movement of the servo motor 21, playing a role of limiting the position.

[0044] As a preferred implementation manner, the slider assembly includes a transmission slider 41 and a connecting plate 42. The transmission slider 41 is threadedly connected to the lead screw module 22. The connecting plate 42 is fixed to the top of the transmission slider 41. The moving base 4 is installed on the top of the connecting plate 42. The magnet 43 is installed on the side of the connecting plate 42 close to the Hall proximity switch 7. By providing the connecting plate 42, it is convenient to fixedly install the moving base 4 and also convenient to install the magnet 43, improving the contact sensitivity between the magnet 43 and the Hall proximity switch 7.

[0045] As a preferred implementation manner, the fixing plate 6 is provided with a strip-shaped hole 61, and the two Hall proximity switches 7 are respectively passed through the two ends of the strip-shaped hole 61. By passing and limiting the Hall proximity switch 7 in the strip-shaped hole 61, the position of the Hall proximity switch 7 on the fixing plate 6 can be adjusted according to actual needs.

[0046] As a preferred implementation manner, there are two fixing bases 3, and the two fixing bases 3 are respectively provided at both ends of the bottom plate 1. The two ends of the fixing plate 6 are respectively connected to the two fixing bases 3. By providing the two fixing bases 3, on the one hand, the fixing plate 6 is fixed, and on the other hand, the calibration of multiple displacement sensors can be realized according to requirements.

[0047] As a preferred implementation manner, a plurality of first limiting grooves 81 connected in sequence are provided along the length direction on the tops of the fixing base 3 and the moving base 4; both the first clamp and the second clamp include a clamp block 83 and an adjustable buckle 84. A plurality of second limiting grooves 82 opposite to the first limiting grooves 81 are provided on the side of the clamp block 83 facing the fixing base 3 or the moving base 4. The first limiting grooves 81 and the second limiting grooves 82 are used to limit the displacement monitoring instruments; by providing a plurality of first limiting grooves 81 and second limiting grooves 82, multiple displacement sensors can be clamped simultaneously for calibration, and the limiting grooves clamp and limit the displacement sensors to prevent them from rolling and shifting, and there will be no mutual influence when calibrating multiple sensors simultaneously.

[0048] A plurality of the adjustable clamping clasps 84 are provided. The plurality of adjustable clamping clasps 84 are respectively arranged on two pairs of both sides at the two ends of the clamping fixture block 83. Opposite sides at the two ends of the fixed base 3 and the moving base 4 are respectively provided with hooks 85 adapted to be hooked with the adjustable clamping clasps 84. During clamping, after placing the clamping fixture block 83 on the top of the fixed base 3 or the moving base 4, hooking the adjustable clamping clasp 84 with the hook 85 can fix the clamping fixture block 83, realizing the clamping and fixing of the displacement sensor to be measured, and ensuring that the telescopic end of the sensor is firmly fixed without slipping when moving linearly along with the slider assembly. Through the design of the adjustable clamping clasp 84, clamping and fixing can be quickly carried out, greatly simplifying the installation process of various displacement gauges above and below, realizing fast and stable connection, and improving the user experience and work efficiency.

[0049] As a preferred implementation manner, both the first limiting groove 81 and the second limiting groove 82 are V-shaped grooves. A plurality of V-shaped strips 86 are arranged at intervals along the width direction of the clamping fixture block 83 on the inner walls of the second limiting groove 82 and / or the first limiting groove 81. By setting the limiting grooves as V-shaped structures and arranging a plurality of V-shaped strips 86, a cross-striped structure for enhancing friction is formed, improving the stability of clamping.

[0050] As a preferred implementation manner, the clamping fixture block 83 and the fixed base 3 and the moving base 4 are respectively provided with positioning holes 87 opposite to each other. The positioning holes 87 are located beside the cross-striped structure. After clamping and fixing, a pin can be inserted into the positioning holes 87, effectively preventing lateral deviation during the use of the fixture and ensuring accurate positioning.

[0051] As a preferred implementation manner, one end of the sensor connector 9 is provided with a threaded interface 91 adapted to be connected with a displacement monitoring instrument. The sensor connector 9 is adapted to the size of the bolt at the telescopic end of the displacement sensor to be measured, adopts a male-female integrated structure, and by equipping the sensor connector 9 with threaded interfaces 91 of various different diameters, compatibility with the telescopic parts of most displacement gauges on the market can be ensured. Just use different sensor connectors 9 for different displacement gauges, which greatly simplifies the clamping operation process, improves the measurement efficiency and convenience.

[0052] In some embodiments of the present application, the device further includes a Web server, a control button, a display screen, a data acquisition module, and a host computer connected to the central control module. The Web server receives control instructions from the host computer of the PC side and forwards them to the central control module. The central control module drives the servo motor 21. The servo motor 21 simultaneously drives the sensor to be measured and the grating scale sensor to generate displacements. The grating scale sensor feeds back the displacement amount measured by it to the central control module in real time. The central control module controls the start and stop of the servo motor 21 according to the data provided by the grating scale sensor. At the same time, the central control module respectively displays the displacement amount data collected by the grating scale sensor on the display screen, sends the data of the sensor to be measured collected by the data acquisition module to the Web server, and displays it in real time on the operation interface of the host computer of the PC side, so as to complete the automatic calibration of the displacement sensor and the real-time display and cloud storage of the collected data.

[0053] The above-mentioned central control module includes a microprocessor, a storage unit connected to the microprocessor, a control button, a display unit, a servo motor 21 control circuit, a first serial communication circuit, a second serial communication circuit, and an encoder interface. The microprocessor is connected to the Web server through the first serial communication circuit to realize the upload and download of data instructions; it controls the operation of the servo motor 21 through the servo motor 21 control circuit; it is connected to the data acquisition module through the second serial communication circuit to realize the transmission of sensor acquisition data; it is respectively connected to two Hall proximity switches 7 through the first and second input interfaces to realize the limit protection of the starting point and the ending point of the motor movement; it realizes human-computer interaction through the control button and the display unit, and realizes data storage through the storage unit.

[0054] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic calibration device for displacement monitoring instruments, characterized in that, include: A linear motion module, the linear motion module is arranged on a bottom plate, and a grating ruler sensor is arranged on one side of the linear motion module along its axial direction; A fixed base, the fixed base is fixed to the bottom plate and is located at one end of the linear motion module, and a first clamp is provided on the top of the fixed base; A mobile base, wherein the mobile base is slidably connected to the linear moving module through a slider assembly, a second fixture is provided on the top of the mobile base, and the second fixture clamps a sensor connector; the main scale of the grating scale sensor is fixed to the bottom plate, and the reading head of the grating scale sensor is connected to the slider assembly; The central control module is respectively connected to the linear motion module and the grating ruler sensor for communication, and is used for receiving control instructions from the terminal, receiving measurement data from the grating ruler sensor, and controlling the operation of the linear motion module.

2. The automatic calibration device for displacement monitoring instruments according to claim 1, characterized in that, A fixed plate is provided along the axial direction of the side of the linear motion module opposite to the grating scale sensor, and Hall proximity switches are provided at both ends of the fixed plate. A magnet is provided on one side of the slider assembly, and the magnet and the Hall proximity switch are located in the same horizontal plane.

3. The automatic calibration device for displacement monitoring instruments according to claim 2, wherein, The fixing plate is provided with a strip hole, and the two Hall proximity switches are respectively arranged at two ends of the strip hole.

4. The automatic calibration device for displacement monitoring instruments according to claim 1, characterized in that The linear motion module comprises a servo motor and a screw module. The screw module is arranged on the bottom plate. The servo motor is transmission-connected to one end of the screw module.

5. The automatic calibration device for displacement monitoring instruments according to claim 2, characterized in that, The two fixed bases are provided, and the two fixed bases are respectively arranged at two ends of the bottom plate, and the two ends of the fixed plate are respectively connected to the two fixed bases.

6. The automatic calibration device for displacement type monitoring instruments according to claim 1 or 5, characterized in that, The top of the fixed base and the movable base are provided with a plurality of first limiting grooves connected in sequence along the length direction thereof; the first clamp and the second clamp each include a clamp block and an adjustable clamp buckle, and the clamp block is provided with a plurality of second limiting grooves opposite to the first limiting grooves on one side facing the fixed base or the movable base, and the first limiting grooves and the second limiting grooves are used to limit the displacement monitoring instrument; There are multiple adjustable clips, which are respectively arranged on two pairs of sides at both ends of the clamp block, and hooks adapted to be hooked with the adjustable clips are respectively arranged on opposite sides at both ends of the fixed base and the movable base.

7. The automatic calibration device for displacement type monitoring instruments according to claim 6, characterized in that, The first limiting groove and the second limiting groove are both V-shaped grooves, and the inner wall of the second limiting groove and / or the first limiting groove is provided with a plurality of V-shaped strips at intervals along the width direction of the clamp block.

8. The automatic calibration device for displacement monitoring instruments according to claim 6, characterized in that, The fixture block is provided with positioning holes respectively on the fixed base and the movable base.

9. The automatic calibration device for displacement monitoring instruments according to claim 4, characterized in that, The slider assembly includes a transmission slider and a connecting plate, the transmission slider is threadedly connected to the screw module, the connecting plate is fixed to the top of the transmission slider, and the movable base is installed on the top of the connecting plate.

10. The automatic calibration device for displacement monitoring instruments according to claim 1, characterized in that, One end of the sensor connector is provided with a threaded interface adapted to be connected to a displacement monitoring instrument.

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