CN110567354A - Calibration device and method for direct-current differential transformer type displacement sensor - Google Patents
Calibration device and method for direct-current differential transformer type displacement sensor Download PDFInfo
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- CN110567354A CN110567354A CN201910877790.4A CN201910877790A CN110567354A CN 110567354 A CN110567354 A CN 110567354A CN 201910877790 A CN201910877790 A CN 201910877790A CN 110567354 A CN110567354 A CN 110567354A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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Abstract
The invention discloses a calibration device for a direct current differential transformer type displacement sensor, which comprises a base, a fixing device, an installation plate, a grating ruler, a feed-forward screw rod, a control system and a digital multimeter, wherein the displacement sensor to be calibrated is fixed on the fixing device, the installation plate is connected to an iron core of the displacement sensor, the installation plate is also connected to the grating ruler and the feed-forward screw rod, the feed-forward screw rod is also connected to the control system, the digital multimeter is connected to the displacement sensor, when in use, the control system drives and controls the feed-forward screw rod according to a calibration point of the displacement sensor to be calibrated, the installation plate is linked with the feed-forward screw rod, the grating ruler reads the displacement of the feed-forward screw rod, and the. The invention can simplify the calibration method and the operation flow and improve the calibration efficiency; the rotation output of the stepping motor is controlled so as to control the input of the displacement sensor, and the requirement of semi-automation is realized; the mounting plate is detachable, assembled and matched for multiple times, and has universality.
Description
Technical Field
The invention relates to the technical field of direct current differential transformer type displacement sensors, in particular to a calibration device and method for a direct current differential transformer type displacement sensor.
Background
the existing calibration method of the direct current differential transformer type displacement sensor can adopt a gauge block or a laser interferometer for calibration. If the gauge block is adopted as a standard calibration method, the risk that the gauge block is easy to fall off and slide exists in the process of repeatedly replacing the gauge block; and the measuring block is limited by the characteristic of discontinuity of the measuring block, and can be calibrated only point to point, when the measuring range of the displacement sensor is large, a single measuring block is required by the measuring block and does not necessarily meet the requirement, and a plurality of groups of measuring blocks are required to be bonded for use, so that the calibration efficiency is greatly reduced, and the time cost is high. If the laser interferometer is adopted as a standard calibration method, a slideway generating relative motion needs to be configured when the laser interferometer is used for calibration, a special track needs to be configured or the laser interferometer is matched with equipment such as a length measuring machine and the like, a corresponding clamp needs to be configured, the corresponding position needs to be adjusted in the early stage of calibration, the operation is complex, the disassembly and assembly time is long, in addition, the price of the existing laser interferometer is very high, so the calibration method adopting the laser interferometer has the defects that the equipment is expensive, and the sensor disassembly and assembly time is long in the calibration process.
Disclosure of Invention
The invention aims to provide a set of calibration method and a corresponding device specially for a direct current differential transformer type displacement sensor, and the calibration device can be used for efficiently calibrating the direct current differential transformer type displacement sensor and improving the economic benefit.
The technical scheme adopted by the invention for solving the technical problems is as follows: a calibration device for a direct current differential transformer type displacement sensor is constructed, and comprises a base, a fixing device, an installation plate, a grating ruler, a feed screw, a control system and a digital multimeter, wherein the fixing device, the installation plate, the grating ruler and the feed screw are installed on the base, the displacement sensor to be calibrated is fixed on the fixing device, the installation plate is connected to an iron core of the displacement sensor, the installation plate is also connected to the grating ruler and the feed screw, the feed screw and the feed screw are also connected to the control system, the digital multimeter is connected to the displacement sensor, when in use, the control system drives and controls the feed screw according to a calibration point of the displacement sensor to be calibrated, the installation plate is linked with the feed screw and the feed screw, the grating ruler reads the displacement of the feed screw and the feed screw, and reading the output voltage of the displacement sensor through the digital multimeter to realize calibration.
In the calibration device for the direct current differential transformer type displacement sensor, the mounting height of the displacement sensor is adjusted by adjusting the upper and lower screws of the clamp of the fixing device; and adjusting the horizontal position between the displacement sensor and the mounting plate by adjusting left and right screws of the clamp.
In the calibration device for the direct current differential transformer type displacement sensor provided by the invention, the displacement sensor is rigidly connected with the mounting plate through a threaded mounting hole, and the mounting plate is connected with the advance and retreat screw rod through a connecting rod.
in the calibration device for the direct current differential transformer type displacement sensor, the mounting plate comprises a threaded mounting plate and a fixed mounting plate, the threaded mounting plate and the fixed mounting plate are rigidly connected through screws, and an iron core of the displacement sensor is rigidly connected with the threaded mounting plate through a threaded mounting hole.
The calibration device for the direct current differential transformer type displacement sensor further comprises a temperature sensor arranged on the base.
in the calibration device for the direct current differential transformer type displacement sensor, the control system comprises a motor and a control unit, the control unit is used for controlling the movement of the motor according to the calibration point, and the motor is used for driving the advance and retreat screw rod.
According to another aspect of the present invention, there is also provided a calibration method for a dc differential transformer type displacement sensor, using the calibration apparatus as described above, including:
Step S1, mounting the displacement sensor to be calibrated on a fixing device, and adjusting the mounting height and the horizontal position of the displacement sensor;
Step S2, fixing the iron core of the displacement sensor on a mounting plate;
step S3, driving and controlling a feed-forward screw rod by a control system according to a calibration point of the displacement sensor to be calibrated, wherein the mounting plate is linked with the feed-forward screw rod;
And step S4, reading the displacement of the advancing and retreating screw rod by the grating ruler, and reading the output voltage of the displacement sensor by the digital multimeter to realize calibration.
In the calibration method for a dc differential transformer type displacement sensor according to the present invention, in step S1, the mounting height of the displacement sensor is adjusted by adjusting the upper and lower screws of the jig of the fixing device; and adjusting the horizontal position between the displacement sensor and the mounting plate by adjusting left and right screws on the side of the fixture fixing table.
In the calibration method for a dc differential transformer type displacement sensor according to the present invention, in step S2, the displacement sensor is fixed to the mounting plate by rigidly connecting the iron core of the displacement sensor to the threaded mounting hole of the mounting plate.
The calibration device and the calibration system for the direct current differential transformer type displacement sensor have the following beneficial effects: the invention uses the modularized device to form the calibration device of the integral direct current differential transformer type displacement sensor, further simplifies the calibration method and the operation flow and improves the calibration efficiency; the rotation output of the stepping motor is controlled by using corresponding control software so as to control the input of the displacement sensor, and the requirement of semi-automation is realized; the mounting plate can be disassembled and assembled, and can be matched for multiple times, so that the universal device has universality.
Drawings
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
fig. 1 is a schematic diagram of a calibration apparatus for a dc differential transformer type displacement sensor according to an embodiment of the present invention;
Fig. 2 is a flowchart of a calibration method of a dc differential transformer type displacement sensor according to an embodiment of the present invention.
Detailed Description
to facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.
Example one
fig. 1 is a schematic diagram of a calibration device for a dc differential transformer displacement sensor according to an embodiment of the present invention, and as shown in fig. 1, the calibration device for a dc differential transformer displacement sensor according to the present invention includes a base (not shown), a fixing device 10, a mounting plate 20, a grating scale 30 for reading a displacement of an advancing/retracting screw 40, an advancing/retracting screw 40 for controlling a moving distance of the mounting plate 20, a control system 50, and a digital multimeter 60. The fixing device 10, the mounting plate 20, the grating ruler 30 and the advance and retreat screw 40 are mounted on the base, the displacement sensor 70 to be calibrated is fixed on the fixing device 10, the mounting plate 20 is connected to an iron core of the displacement sensor 70, the mounting plate 20 is further connected to the grating ruler 30 and the advance and retreat screw 40, the advance and retreat screw 40 is further connected to the control system 50, and the digital multimeter 60 is connected to the displacement sensor 70. When the device is used, the control system drives and controls the advance and retreat screw rod according to the calibration point of the displacement sensor to be calibrated, the mounting plate is linked with the advance and retreat screw rod, the grating ruler reads the displacement of the advance and retreat screw rod, and the output voltage of the displacement sensor is read through the digital multimeter to realize calibration. The direct current differential transformer type displacement sensor to be calibrated is rigidly connected with the mounting plate through the threaded mounting hole, the mounting plate is connected with the grating ruler, and the mounting plate is connected with the advancing and retreating screw rod through the connecting rod, so that the displacement of the direct current differential transformer type displacement sensor is consistent with the change of the reading of the grating ruler, the reading of the grating ruler can be controlled by controlling the displacement of the advancing and retreating screw rod, the purpose of controlling the displacement input quantity of the displacement sensor is achieved, and the calibration requirement is met. Therefore, the problem that the gauge blocks are frequently replaced when the calibration points are changed by using the gauge blocks can be solved, the complex installation of the direct-current differential displacement sensor by using the laser interferometer and the length measuring machine is further simplified, and the working efficiency is greatly improved.
Further, in an embodiment of the present invention, the fixing device is used for fixing the displacement sensor to be calibrated, and has a function of adjusting the vertical and horizontal installation positions of the displacement sensor. The upper and lower screws of the clamp of the fixing device are adjusted, and the installation height can be adjusted in the slide way of the clamp, so that the installation position height of the displacement sensor can be adjusted; the horizontal position between the displacement sensor and the mounting plate can be adjusted by adjusting the left and right screws on the side of the fixture fixing table.
Further, in an embodiment of the present invention, the mounting plate 20 includes a threaded mounting plate and a fixed mounting plate, the threaded mounting plate and the fixed mounting plate are rigidly connected through a screw, and the iron core of the displacement sensor is rigidly connected to the threaded mounting plate through a threaded mounting hole. In the present invention, the mounting plate 20 may be divided into two parts, the upper half being a threaded mounting plate and the lower half being a fixed mounting plate. The threaded mounting plate and the fixed mounting plate are rigidly connected through screws, and different mounting plates can be replaced at the upper half part, so that when the external thread diameter of the iron core of the displacement sensor is changed, the upper half mounting plate is only required to be redesigned, and the threaded part of the threaded mounting plate is matched with the external thread diameter of the iron core of the displacement sensor, so that the displacement sensor is more universal.
further, in an embodiment of the present invention, the apparatus further includes a temperature sensor mounted on the base. The ambient temperature is monitored in real time through the temperature sensor, and the measurement accuracy of the grating ruler is guaranteed.
Further, in an embodiment of the present invention, the control system includes a motor and a control unit, the control unit is configured to control the motor to move according to the calibration point, and the motor is configured to drive the advance/retreat screw. Specifically, the selection of the calibration points is determined according to the measuring range of the displacement sensor, and the distribution of the calibration points is selected according to JJF 1305-2011 item 7.2. The displacement sensor is arranged on a threaded hole of the mounting plate, the position of the mounting position of the displacement sensor is adjusted to enable an iron core of the direct-current differential transformer type displacement sensor to be vertical to the mounting plate, after the position requirement is met, the displacement is calibrated according to the requirement through the control unit, the motor is controlled to rotate, the standard displacement is controlled to be input, the displacement sensor is driven, corresponding output can be obtained through the external digital multimeter, and the purpose of calibration is achieved. In the process, the operation of personnel becomes simpler, and the efficiency of calibrating the displacement sensor is greatly improved.
the working process of the alternative calibrating device for the direct current differential transformer type displacement sensor comprises the following steps:
The inspector starts the computer and starts the motor;
mounting a displacement sensor on a fixing device, adjusting the height and the horizontal position of a fixing position of the displacement sensor, finding a matching threaded hole in a mounting plate, tightening a thread, and further fixing the sensor;
Starting software, selecting a calibration point corresponding to the displacement sensor, driving a motor to rotate by a control unit, driving an advancing and retreating screw rod to move by the motor, linking the advancing and retreating screw rod with an installation plate, and inputting displacement quantity by the displacement sensor and sensing the displacement quantity by a grating ruler because the sensor is rigidly connected with the installation plate through threads;
Through processing, the standard displacement is displayed on a computer screen, the external connected digital multimeter reads the voltage value output by the displacement sensor to finish the calibration of one point, and the subsequent calibration point operation only needs to click software to control the displacement so as to obtain the voltage output of the corresponding displacement sensor.
Example two
based on the same inventive concept, as shown in fig. 2, the present invention further provides a calibration method for a dc differential transformer type displacement sensor, which adopts the calibration apparatus provided by the first embodiment, and includes the following steps:
step S1, mounting the displacement sensor to be calibrated on a fixing device, and adjusting the mounting height and the horizontal position of the displacement sensor;
Step S2, fixing the iron core of the displacement sensor on a mounting plate;
step S3, driving and controlling a feed-forward screw rod by a control system according to a calibration point of the displacement sensor to be calibrated, wherein the mounting plate is linked with the feed-forward screw rod;
And step S4, reading the displacement of the advancing and retreating screw rod by the grating ruler, and reading the output voltage of the displacement sensor by the digital multimeter to realize calibration.
specifically, in step S1, the mounting height of the displacement sensor is adjusted by adjusting the upper and lower screws of the clamp of the fixing device; and adjusting the horizontal position between the displacement sensor and the mounting plate by adjusting left and right screws on the side of the fixture fixing table.
Specifically, in step S2, the displacement sensor is fixed to the mounting plate by rigidly connecting the iron core of the displacement sensor to the threaded mounting hole of the mounting plate.
For other details, reference may be made to the first embodiment, which is not described herein again.
Compared with the prior art, the calibration device for the direct current differential transformer type displacement sensor has the following advantages in aspects:
1. The displacement sensor and the mounting plate are rigidly connected together through the threaded mounting hole, the mounting plate is connected with the grating ruler, and the mounting plate and the advancing and retreating screw rod are connected together through the connecting rod, so that the displacement of the direct current differential transformer type displacement sensor is consistent with the reading change of the grating ruler, and the reading of the grating ruler can be controlled by controlling the displacement of the advancing and retreating screw rod, so that the purpose of controlling the displacement input quantity of the displacement sensor is achieved; therefore, the modularized device is utilized to form the calibration device of the integral direct current differential transformer type displacement sensor, the calibration method and the operation flow are further simplified, and the calibration efficiency is improved;
2. The displacement sensor is arranged on a threaded hole of the mounting plate, the position of the mounting position of the displacement sensor is adjusted to ensure that an iron core of the direct-current differential transformer type displacement sensor is perpendicular to the mounting plate, after the position requirement is met, the control unit controls the rotation of the motor according to the displacement to be calibrated, so that the input of standard displacement is controlled, the displacement sensor is driven, and corresponding output can be obtained through an external digital multimeter to achieve the aim of calibration; the rotation output of the stepping motor is controlled by using corresponding control software so as to control the input of the displacement sensor, and the requirement of semi-automation is realized;
3. the threaded mounting plate and the fixed mounting plate are rigidly connected through screws, and different mounting plates can be replaced at the upper half part, so that when the external thread diameter of the iron core of the displacement sensor is changed, the upper half mounting plate is only required to be redesigned, the threaded part of the threaded mounting plate is matched with the external thread diameter of the iron core of the displacement sensor, and the universal device is more universal.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read Only Memory (ROM), a Random Access Memory (RAM), or the like.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
while the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A calibration device for a direct current differential transformer type displacement sensor is characterized by comprising a base, a fixing device, an installation plate, a grating ruler, a forward and backward screw rod, a control system and a digital multimeter, wherein the fixing device, the installation plate, the grating ruler and the forward and backward screw rod are installed on the base, the displacement sensor to be calibrated is fixed on the fixing device, the installation plate is connected to an iron core of the displacement sensor, the installation plate is also connected to the grating ruler and the forward and backward screw rod, the forward and backward screw rod is also connected to the control system, the digital multimeter is connected to the displacement sensor, when in use, the control system drives and controls the forward and backward screw rod according to a calibration point of the displacement sensor to be calibrated, the installation plate is linked with the forward and backward screw rod, the grating ruler reads the displacement of the forward and backward screw rod, and reading the output voltage of the displacement sensor through the digital multimeter to realize calibration.
2. The calibrating device for a dc differential transformer type displacement sensor according to claim 1, wherein the mounting height of the displacement sensor is adjusted by adjusting upper and lower screws of a jig of the fixing device; and adjusting the horizontal position between the displacement sensor and the mounting plate by adjusting left and right screws of the clamp.
3. the calibration device according to claim 1, wherein said displacement sensor is rigidly connected to said mounting plate by means of threaded mounting holes, said mounting plate being connected to said leadscrew by means of a connecting rod.
4. the calibration device for a dc differential transformer type displacement sensor according to claim 3, wherein the mounting plate comprises a threaded mounting plate and a fixed mounting plate, the threaded mounting plate and the fixed mounting plate are rigidly connected by a screw, and the iron core of the displacement sensor is rigidly connected with the threaded mounting plate by a threaded mounting hole.
5. the calibration device for a dc differential transformer type displacement sensor according to claim 1, further comprising a temperature sensor disposed on said base.
6. The calibration device according to claim 1, wherein the control system comprises a motor and a control unit, the control unit is configured to control the motor to move according to the calibration point, and the motor is configured to drive the advancing/retreating screw.
7. a calibration method for a dc differential transformer type displacement sensor using the calibration device according to claims 1 to 6, comprising:
Step S1, mounting the displacement sensor to be calibrated on a fixing device, and adjusting the mounting height and the horizontal position of the displacement sensor;
Step S2, fixing the iron core of the displacement sensor on a mounting plate;
Step S3, driving and controlling a feed-forward screw rod by a control system according to a calibration point of the displacement sensor to be calibrated, wherein the mounting plate is linked with the feed-forward screw rod;
And step S4, reading the displacement of the advancing and retreating screw rod by the grating ruler, and reading the output voltage of the displacement sensor by the digital multimeter to realize calibration.
8. The calibration method for a dc differential transformer type displacement sensor according to claim 7, wherein in the step S1, the installation height of the displacement sensor is adjusted by adjusting upper and lower screws of a jig of the fixture; and adjusting the horizontal position between the displacement sensor and the mounting plate by adjusting left and right screws on the side of the fixture fixing table.
9. The calibration method for a dc differential transformer type displacement sensor according to claim 7, wherein in the step S2, the displacement sensor is fixed on the mounting plate by rigidly connecting the iron core of the displacement sensor with the threaded mounting hole of the mounting plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910877790.4A CN110567354A (en) | 2019-09-17 | 2019-09-17 | Calibration device and method for direct-current differential transformer type displacement sensor |
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| CN201910877790.4A CN110567354A (en) | 2019-09-17 | 2019-09-17 | Calibration device and method for direct-current differential transformer type displacement sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116086300A (en) * | 2023-04-07 | 2023-05-09 | 苏州中科科仪技术发展有限公司 | Calibration method of magnetic suspension molecular pump displacement sensor and application thereof |
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| CN101592474A (en) * | 2009-06-26 | 2009-12-02 | 哈尔滨工业大学 | The evaluation method of asphalt pavement material and fiber-optic grating sensor cooperative transformation |
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