Calibration method of tension sensor

Abstract

The invention relates to a calibration method of a tension sensor calibration device, which is used for installing a calibrated tension sensor on the tension sensor calibration device and specifically comprises the following steps of: 1) moving an upper pressing plate of a force transmission mechanism away from a force transmission column of the force transmission mechanism; (2) an adjusting cylinder drives a force transmission mechanism lower pressing plate to drive a lower side ball seat to move upwards, and the lower side ball seat is separated from a lower side ball head; (3) the lower end of the calibrated tension sensor is in threaded connection with the lower side ball head, the upper side ball head is in threaded connection with the upper end of the calibrated tension sensor, and the calibrated tension sensor carries the lower side ball head to move upwards to be separated from the lower pressing plate of the supporting mechanism; 4, the piston rod of the adjusting cylinder retracts, the force transmission mechanism lower pressing plate drives the lower side ball seat to move downwards, the lower side ball seat makes contact with the lower side ball head, and the piston rod of the adjusting cylinder is disengaged from the force transmission mechanism lower pressing plate.

Description

Technical Field

[0001] The present invention relates to the technical field of verification and calibration, and particularly to a calibration method for a tensile sensor. Background Art

[0002] With the digital, networked, and intelligent transformation and upgrading in the industrial and industrial sectors, the measurement and control of force are developing towards large-scale. In many cases, it is necessary to measure forces of several meganewtons or even more than a dozen meganewtons. Large-force sensors are not only applied in traditional fields such as airports, bridges, tunnels, mines, large water conservancy projects, and highways. In these traditional fields, the measurement of large forces is mostly compressive force. With the rapid development of many high-precision fields such as aerospace, shipbuilding, heavy manufacturing equipment, and precision assembly, the metrological detection requirements for large-force tensile forces, that is, tensile sensors, are growing rapidly.

[0003] In recent years, in the aerospace field, with the rapid development of the aviation industry, the aircraft structure, materials, and processing technology have become increasingly complex. The test requirements, scale, and load complexity of newly developed models are getting higher and higher. Structural forms such as arrestor hooks and ejection devices have emerged. These structures have a common feature, that is, the test load is large and it is a tensile load. How to accurately measure such single-point large tensile loads to achieve the true assessment of the structural load has become a difficult point in aircraft structure tests.

[0004] For the shipbuilding industry, large-force tensile sensors are mainly used to detect the thrust of large ships, and then improve the ship power design and control the quality of ship components according to the detection data. Therefore, the metrology of large-force tensile forces is of great significance to the development of the shipbuilding industry. Due to the common problems of large self-weight (about 1 ton), large size (more than 1 meter in length), and mismatched detection space in large-force tensile sensors, it is difficult to measure and detect tensile forces, and the supply of metrological services for large-force tensile forces has become a key bottleneck restricting the quality improvement of the shipbuilding industry.

[0005] For large-force pressure sensors, the metrological calibration process is relatively simple. For example, the pressure sensor can be directly pressurized by a press, but the press cannot directly pull the tensile sensor, which makes the calibration of the tensile sensor a difficult problem in the field of sensor metrological calibration. Summary of the Invention

[0006] The purpose of the present invention is to provide a calibration method for a tensile sensor that can assist a press in calibrating the tensile sensor.

[0007] To solve the above technical problems, the technical solution of a calibration method for a tensile sensor in the present invention is as follows: The method includes the following steps, First step: Install the tension sensor to be calibrated on the tension sensor calibration device. Specifically, 1) Move the upper pressure plate of the force transmission mechanism away from the force transmission column of the force transmission mechanism; 2) The adjustment cylinder drives the lower pressure plate of the force transmission mechanism to move upward with the lower ball seat, and the lower ball seat disengages from the lower ball head; 3) Thread-connect the lower end of the tension sensor to be calibrated with the lower ball head, and thread-connect the upper ball head with the upper end of the tension sensor to be calibrated. The tension sensor to be calibrated moves upward with the lower ball head and disengages from the lower pressure plate of the support mechanism; 4) The piston rod of the adjustment cylinder retracts, the lower pressure plate of the force transmission mechanism moves downward with the lower ball seat, the lower ball seat contacts the lower ball head, and the piston rod of the adjustment cylinder disengages from the lower pressure plate of the force transmission mechanism. Second step: Place the upper pressure plate of the force transmission mechanism on the upper ends of the force transmission columns of each force transmission mechanism, and the press applies pressure to the upper pressure plate of the force transmission mechanism to calibrate the tension sensor to be calibrated.

[0008] Furthermore, the tension sensor calibration device includes a support mechanism base plate, a support mechanism upper pressure plate is connected to the support mechanism base plate through support mechanism columns, and also includes a force transmission mechanism upper pressure plate above the support mechanism upper pressure plate and a force transmission mechanism lower pressure plate between the support mechanism base plate and the support mechanism upper pressure plate. The support mechanism columns are located outside the force transmission mechanism lower pressure plate. The force transmission mechanism upper pressure plate is connected to the force transmission mechanism lower pressure plate through force transmission mechanism columns, and the force transmission mechanism columns are located outside the support mechanism upper pressure plate. A lower side thrust structure for applying a downward thrust to the lower end of the tension sensor to be calibrated is provided on the force transmission mechanism lower pressure plate, and an upper side thrust structure for downward pushing of the upper end of the tension sensor is provided on the support mechanism upper pressure plate.

[0009] Furthermore, the upper side thrust mechanism includes an upper side ball seat and an upper side ball head. The upper side ball seat has an upper side ball groove with an upward concave opening for rotational cooperation with the upper side ball head. The upper side ball head has an upper side threaded hole for thread-connecting with the upper end of the tension sensor to be calibrated, and the upper side ball seat is fixedly provided on the support mechanism upper pressure plate.

[0010] Furthermore, the lower side thrust mechanism includes a lower side ball seat and a lower side ball head. The lower side ball seat has a lower side ball groove with a downward concave opening for rotational cooperation with the lower side ball head. The lower side ball head has a lower side threaded hole for thread-connecting with the lower end of the tension sensor to be calibrated, and the lower side ball seat is fixedly provided on the force transmission mechanism lower pressure plate.

[0011] Furthermore, the upper pressing plate of the supporting mechanism and the lower pressing plate of the force transmission mechanism are both triangular structures. Each corner of the upper pressing plate of the supporting mechanism is an upper pressing plate mounting corner extending outside the corresponding side of the lower pressing plate of the force transmission mechanism, and each corner of the lower pressing plate of the force transmission mechanism is a lower pressing plate mounting corner extending outside the corresponding side of the upper pressing plate of the supporting mechanism. There are three force transmission columns of the force transmission mechanism, and each force transmission column of the force transmission mechanism is respectively connected to the corresponding lower pressing plate mounting corner; there are three supporting mechanism columns, and each supporting mechanism column is respectively connected to the corresponding upper pressing plate mounting corner.

[0012] Furthermore, the tension sensor calibration device further includes three adjustment cylinders arranged at intervals in the circumferential direction. The adjustment cylinders are located between the lower pressing plate of the force transmission mechanism and the lower pressing plate of the supporting mechanism, and the upper ends of each adjustment cylinder are respectively used to push against the bottom of the corresponding lower pressing plate mounting corner.

[0013] Furthermore, the upper end of the force transmission column of the force transmission mechanism is provided with an upward protruding positioning head, and the bottom of the upper pressing plate of the force transmission mechanism is provided with positioning holes that are adaptively inserted into the positioning heads at the upper ends of the force transmission columns of the force transmission mechanism in the up and down directions.

[0014] The beneficial effects of the present invention are as follows: When the tension sensor calibration device in the present invention is in use, the upper end of the tension sensor to be calibrated is connected to the upper pressing plate of the supporting mechanism, the upper end of the tension sensor to be calibrated is supported by the supporting mechanism, the lower end of the tension sensor to be calibrated is connected to the lower pressing plate of the force transmission mechanism, the pressure of the press acts on the upper pressing plate of the force transmission mechanism, and the pressure is transmitted to the lower pressing plate of the force transmission mechanism through the force transmission columns of the force transmission mechanism, so as to realize the pulling of the tension sensor and the calibration of the tension sensor. Description of the Drawings

[0015] By referring to the accompanying drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, where: Figure 1 is a schematic structural diagram of an embodiment of the calibration method of the tension sensor in the present invention; Figure 2 is Figure 1 a three-dimensional view of 1. Upper pressing plate of the force transmission mechanism; 2. Upper pressing plate mounting corner; 3. Positioning hole; 4. Positioning head; 5. Force transmission column of the force transmission mechanism; 6. Threaded rod; 7. Lower pressing plate of the force transmission mechanism; 8. Adjustment cylinder; 9. Lower pressing plate of the supporting mechanism; 10. Upper spherical head; 11. Upper spherical groove; 12. Upper spherical seat; 13. Tension sensor to be calibrated; 14. Lower spherical groove; 15. Lower spherical head; 16. Supporting mechanism column; 17. Lower pressing plate mounting corner. Detailed Embodiments

[0016] To facilitate the understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive.

[0017] It should be noted that unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention.

[0018] An embodiment of a calibration method for a tensile force sensor in the present invention is as Figures 1-2 shown: This method includes the following steps. In the first step, the tensile force sensor to be calibrated is installed on the tensile force sensor calibration device. Specifically, 1), move the upper pressing plate of the force transmission mechanism away from the force transmission column of the force transmission mechanism; 2), the adjustment cylinder drives the lower pressing plate of the force transmission mechanism to move upward with the lower spherical seat, and the lower spherical seat is disengaged from the lower spherical head; 3), threadedly connect the lower end of the tensile force sensor to be calibrated to the lower spherical head, and threadedly connect the upper spherical head to the upper end of the tensile force sensor to be calibrated. The tensile force sensor to be calibrated moves upward with the lower spherical head and is disengaged from the lower pressing plate of the support mechanism; 4), the piston rod of the adjustment cylinder retracts, the lower pressing plate of the force transmission mechanism drives the lower spherical seat to move downward, the lower spherical seat contacts the lower spherical head, and the piston rod of the adjustment cylinder is disengaged from the lower pressing plate of the force transmission mechanism. In the second step, place the upper pressing plate of the force transmission mechanism on the upper ends of the force transmission columns of each force transmission mechanism, and the press applies pressure to the upper pressing plate of the force transmission mechanism to calibrate the tensile force sensor to be calibrated.

[0019] The structure of the tensile force sensor calibration device is as Figures 1-2 shown: It includes a support mechanism and a force transmission mechanism. The support mechanism includes a support mechanism bottom plate and a support mechanism upper pressing plate located on the upper side of the support mechanism bottom plate. The support mechanism upper pressing plate is connected to the support mechanism bottom plate by three support mechanism columns arranged at intervals in the circumferential direction. The force transmission mechanism includes a force transmission mechanism upper pressing plate located on the upper side of the support mechanism upper pressing plate and a force transmission mechanism lower pressing plate located between the support mechanism bottom plate and the support mechanism upper pressing plate. The support mechanism columns are located outside the force transmission mechanism lower pressing plate. The force transmission mechanism upper pressing plate is connected to the force transmission mechanism lower pressing plate through a force transmission mechanism column, and the force transmission mechanism column is located outside the support mechanism upper pressing plate. A lower thrust structure for applying a downward thrust to the lower end of the tensile force sensor to be calibrated is provided on the force transmission mechanism lower pressing plate, and an upper thrust structure for downwardly pushing the upper end of the tensile force sensor is provided on the support mechanism upper pressing plate.

[0020] In this embodiment, the upper thrust mechanism includes an upper ball seat and an upper ball head. The upper ball seat has an upper ball groove with a notch facing upward and rotatably mating with the upper ball head. The upper ball head has an upper threaded hole for threaded connection with the upper end of the calibrated tension sensor. The upper ball seat is fixedly arranged on the upper pressing plate of the support mechanism.

[0021] The lower thrust mechanism includes a lower ball seat and a lower ball head. The lower ball seat has a lower ball groove with a notch facing downward and rotatably mating with the lower ball head. The lower ball head has a lower threaded hole for threaded connection with the lower end of the calibrated tension sensor. The lower ball seat is fixedly arranged on the lower pressing plate of the force transmission mechanism. During use, the upper end of the calibrated tension sensor is threadedly connected to the upper ball head, and the lower end of the calibrated tension sensor is threadedly connected to the lower ball head. The calibrated tension sensor penetrates through the upper ball seat and the lower ball seat in the up-and-down direction.

[0022] In this embodiment, both the upper pressing plate of the support mechanism and the lower pressing plate of the force transmission mechanism are triangular structures. Each corner of the upper pressing plate of the support mechanism is an upper pressing plate mounting corner extending outside the corresponding side of the lower pressing plate of the force transmission mechanism. Each corner of the lower pressing plate of the force transmission mechanism is a lower pressing plate mounting corner extending outside the corresponding side of the upper pressing plate of the support mechanism. There are three force transmission columns of the force transmission mechanism, and each force transmission column of the force transmission mechanism is respectively connected to the corresponding lower pressing plate mounting corner; there are three support columns of the support mechanism, and each support column of the support mechanism is respectively connected to the corresponding upper pressing plate mounting corner.

[0023] The tension sensor calibration device further includes three adjustment cylinders arranged at intervals in the circumferential direction. The adjustment cylinders are located between the lower pressing plate of the force transmission mechanism and the lower pressing plate of the support mechanism. The upper ends of each adjustment cylinder are respectively used to push against the bottom of the corresponding lower pressing plate mounting corner. The upper end of the piston rod of the adjustment cylinder has no connection relationship with the bottom of the lower pressing plate of the force transmission mechanism, that is, the upper end of the piston rod of the adjustment cylinder can be separated from the lower pressing plate of the mechanism. The three adjustment cylinders can be independently controlled and actuated to adjust the height and angle of the support mechanism according to the working conditions so as to install the calibrated tension sensor.

[0024] The lower end of the force transmission column of the force transmission mechanism has a threaded rod for detachably connecting with the lower pressing plate of the force transmission mechanism. The upper end of the force transmission column of the force transmission mechanism is provided with a positioning head protruding upward. The bottom of the upper pressing plate of the force transmission mechanism is provided with positioning holes that are adaptively inserted with the positioning heads at the upper ends of the force transmission columns of the force transmission mechanism in the up-and-down direction.

[0025] This tension sensor calibration device is combined with a 20MN press to form a 20MN tension detection mechanism, realizing the calibration of the tension sensor, meeting the increasing need for calibrating the tension ultra-large force value sensor, having significant innovation and advancement, and filling the blank of calibrating the tension ultra-large force value sensor in our institute.

[0026] In other embodiments of the present invention, the connection between the force transmission column of the force transmission mechanism and the lower pressing plate of the force transmission mechanism may also occur after the upper spherical head is connected to the calibrated tension sensor. In this way, during the connection process between the upper spherical head and the calibrated tension sensor, without the interference of the force transmission column of the force transmission mechanism, it will be more convenient and faster.

[0027] In the above description of this specification, unless otherwise clearly specified and limited, terms such as "fixed", "installed", "connected" or "linked" should be understood in a broad sense. For example, for the term "connected", it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components or the interaction relationship between two components. Therefore, unless otherwise clearly limited in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0028] According to the above description of this specification, those skilled in the art can also understand the following terms used, such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise", etc. Terms indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or component involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above terms of orientation or position relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0029] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this specification, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically limited.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calibrating a tension sensor, characterized in that: The method comprises the following steps, The first step is to install the calibrated tension sensor on the tension sensor calibration device. Specifically, 1) remove the upper pressure plate of the force transmission mechanism from the force transmission column of the force transmission mechanism; 2) the adjustment cylinder drives the lower pressure plate of the force transmission mechanism to move upward with the lower ball seat, and the lower ball seat is separated from the lower ball head; 3) the lower end of the calibrated tension sensor is threadedly connected with the lower ball head, and the upper ball head is threadedly connected with the upper end of the calibrated tension sensor, and the calibrated tension sensor moves upward with the lower ball head and is separated from the lower pressure plate of the supporting mechanism; 4) the piston rod of the adjustment cylinder is retracted, the lower pressure plate of the force transmission mechanism moves downward with the lower ball seat, the lower ball seat contacts the lower ball head, and the piston rod of the adjustment cylinder is separated from the lower pressure plate of the force transmission mechanism; In the second step, the upper pressure plate of the force transmission mechanism is placed on the upper end of the force transmission column of each force transmission mechanism, and the press machine applies pressure to the upper pressure plate of the force transmission mechanism to achieve calibration of the calibrated tension sensor.

2. The calibration method according to claim 1, characterized in that: The tension sensor calibration device includes a support mechanism base plate, on which a support mechanism upper pressure plate is connected through support mechanism pillars, and also includes a force transmission mechanism upper pressure plate located on the upper side of the support mechanism upper pressure plate and a force transmission mechanism lower pressure plate located between the support mechanism base plate and the support mechanism upper pressure plate, the support mechanism pillars are located at the periphery of the force transmission mechanism lower pressure plate, the force transmission mechanism upper pressure plate is connected to the force transmission mechanism lower pressure plate through a force transmission mechanism force transmission column, the force transmission mechanism force transmission column is located at the periphery of the support mechanism upper pressure plate, the force transmission mechanism lower pressure plate is provided with a lower thrust structure for applying a downward thrust to the lower end of the calibrated tension sensor, and the support mechanism upper pressure plate is provided with an upper thrust structure for pushing the upper end of the tension sensor downward.

3. The calibration method according to claim 2, characterized in that: The upper thrust mechanism includes an upper ball seat and an upper ball head. The upper ball seat has an upper ball groove with an upward notch for rotationally cooperating with the upper ball head. The upper ball head has an upper threaded hole for threaded connection with the upper end of the calibrated tension sensor. The upper ball seat is fixedly arranged on the upper pressure plate of the support mechanism.

4. The calibration method according to claim 2, characterized in that: The lower thrust mechanism includes a lower ball seat and a lower ball head. The lower ball seat has a lower ball groove with a downward notch for rotationally cooperating with the lower ball head. The lower ball head has a lower threaded hole for threaded connection with the lower end of the calibrated tension sensor. The lower ball seat is fixedly arranged on the lower pressure plate of the force transmission mechanism.

5. The calibration method according to claim 2, characterized in that: The upper pressure plate of the support mechanism and the lower pressure plate of the force transmission mechanism are both triangular structures. Each corner of the upper pressure plate of the support mechanism is an upper pressure plate mounting angle extending outward from the corresponding side edge of the lower pressure plate of the force transmission mechanism, and each corner of the lower pressure plate of the force transmission mechanism is a lower pressure plate mounting angle extending outward from the corresponding side edge of the upper pressure plate of the support mechanism. The force transmission mechanism has three force transmission columns, and each force transmission column of the force transmission mechanism is respectively connected to the corresponding lower pressure plate mounting angle; the support mechanism has three pillars, and each support mechanism pillar is respectively connected to the corresponding upper pressure plate mounting angle.

6. The calibration method according to claim 2, characterized in that: The tension sensor calibration device also includes three adjustment cylinders arranged at intervals along the circumferential direction. The adjustment cylinders are located between the lower pressure plate of the force transmission mechanism and the lower pressure plate of the support mechanism. The upper end of each adjustment cylinder is used to push the bottom of the corresponding lower pressure plate installation angle.

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