A magnetic liquid level measurement and calibration device and method

Abstract

This invention discloses a magnetic liquid level measurement and calibration device and method. The device includes a slide table, a sealed housing, a camera, and a laser displacement sensor. Two sealed housings are arranged opposite each other, each with a magnetic ring at one end. A magnetic liquid ring is placed between the two magnetic rings. The slide table is mounted on a base plate, and both sealed housings are connected to the slide table to allow for adjustable distance between the magnetic rings. The camera is tangentially aligned with the outer surface of the magnetic liquid ring in a certain direction, and the laser displacement sensor is radially aligned with the outer surface of the magnetic liquid ring in the same direction. A vacuum component is connected to the sealed housing to change the vacuum level within it. This invention can correct the liquid level contour line acquired by the laser displacement sensor based on the outer contour boundary image acquired by the camera, and establish a correspondence between the liquid level contour lines acquired by the laser displacement sensor under different curvatures and inclinations and the actual liquid level contour lines of the magnetic liquid.

Description

Technical Field

[0001] This invention relates to the field of fluid measurement technology, specifically to a magnetic liquid level measurement and calibration device and method. Background Technology

[0002] Magnetic fluids are stable colloidal suspensions with magnetic response, typically composed of magnetic nanoparticles, surfactants, and a carrier liquid. Due to their combined magnetic response and fluid flow characteristics, magnetic fluids are widely used in various sealing devices. To ensure the reliable operation of magnetic fluid sealing devices, it is necessary to study the flow characteristics of magnetic fluids under conditions such as high-speed rotation, eccentric oscillation, and temperature changes. Simultaneously, it is also necessary to monitor the magnetic fluid volume within the sealing device in real time. Because the magnetic fluid is confined by the magnetic field within the narrow sealing gap constructed by the magnetically conductive structure, traditional methods such as visual measurement, eddy current detection, magnetic detection, and ultrasonic detection are difficult to obtain accurate liquid surface position and shape due to space constraints, strong magnetic field interference, and nanoparticle scattering.

[0003] Laser displacement measurement technology is an effective non-contact method for measuring the position of moving objects. However, due to differences in the content of magnetic particles and the composition of the carrier liquid in different magnetic fluids, parameters such as transmittance, absorbance, and reflectance vary significantly. Furthermore, the incident angle, reflection angle of the measuring light, and the curvature of the measured liquid can also interfere with the laser displacement measurement results, affecting the final measurement accuracy. Therefore, before applying laser displacement measurement technology to the surface measurement of specific magnetic fluids, it is necessary to calibrate the laser displacement sensor according to the type of magnetic fluid and the characteristics of the surface shape. Summary of the Invention

[0004] The purpose of this invention is to provide a magnetic liquid level measurement and calibration device and method to solve the problem of inaccurate measurement of the surface morphology of magnetic liquids.

[0005] This invention is achieved through the following technical solution: In a first aspect, the present invention provides a magnetic liquid level measurement and calibration device, comprising a slide, a sealed housing, a camera, and a laser displacement sensor. Two sealed housings are arranged opposite each other, each with a magnetic ring at one end. A magnetic liquid ring is disposed between the two magnetic rings. The slide is mounted on a base plate, and both sealed housings are connected to the slide to make the distance between the two magnetic rings adjustable. The camera is tangentially aligned with the outer surface of the magnetic liquid ring in a certain direction, and the laser displacement sensor is radially aligned with the outer surface of the magnetic liquid ring in the same direction. A vacuum component is connected to the sealed housing to change the vacuum level within the sealed housing.

[0006] As a further embodiment of the present invention, the end of the sealing housing is provided with a circular groove that matches the outer diameter of the magnetic ring, and one end of the magnetic ring extends into the circular groove and a sealed connection is formed between the two.

[0007] As a further embodiment of the present invention, the sealing housing is provided with a connection hole, one end of the connection hole is connected to the inner side of the magnetic ring, and the vacuum component is connected to the other end of the connection hole.

[0008] As a further embodiment of the present invention, the vacuum component includes a vacuum pipe, one end of which is connected to the connection hole and the other end of which is connected to a vacuum device.

[0009] As a further embodiment of the present invention, the vacuum component further includes a vacuum gauge, which is disposed on the vacuum pipe.

[0010] As a further embodiment of the present invention, the laser displacement sensor is mounted on the base plate via a sensor bracket, and both the horizontal mounting position of the sensor bracket and the vertical mounting position of the laser displacement sensor are adjustable.

[0011] As a further embodiment of the present invention, the sensor bracket is a T-shape composed of a horizontal plate and a vertical plate, and the horizontal plate and the vertical plate are respectively provided with waist-shaped grooves. The horizontal plate is connected to the base plate, and the vertical plate is used to install the laser displacement sensor.

[0012] As a further embodiment of the present invention, the slide table includes a guide rail, a slider, a lead screw, and a motor. The guide rail and the lead screw are both arranged along the axial direction of the magnetic ring. The lead screw is provided with two external threads with opposite directions. There are two sliders mounted on the guide rail. The two sliders are respectively connected to the two external threads on the lead screw. The output shaft of the motor is connected to the end of the lead screw.

[0013] As a further embodiment of the present invention, the bottom of the sealing housing is provided with a mounting hole for connecting with the slider on the slide table.

[0014] Secondly, the present invention provides a calibration method for the magnetic liquid level measurement calibration device described above, comprising the following steps: Construct a magnetic liquid annular outer surface whose curvature and slope can be dynamically adjusted; A camera is set up in the tangential direction at a certain position on the magnetic fluid toroidal surface, and a laser displacement sensor is set up in the radial direction at the same position on the magnetic fluid toroidal surface. The outer contour boundary image of the annular outer surface of the magnetic liquid in this orientation is acquired using a camera, and the liquid surface contour line of the annular outer surface of the magnetic liquid in this orientation is acquired using a laser displacement sensor. The liquid surface contour line acquired by the laser displacement sensor is corrected based on the outer contour boundary image acquired by the camera, and the correspondence between the liquid surface contour line acquired by the laser displacement sensor under different curvatures and slopes and the actual liquid surface contour line of the magnetic liquid is established.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: The device of this invention allows for the creation of a series of magnetic liquid annular outer surfaces with different curvatures and inclinations by adjusting the distance between the two magnetic rings, the volume of magnetic fluid filling the space between the two magnetic rings, and the vacuum level in the sealed housing. It establishes a correspondence between the liquid surface contour lines acquired by the laser displacement sensor under different curvatures and inclinations of a specific magnetic liquid and the actual liquid surface contour lines of the magnetic liquid. The liquid surface contour lines acquired by the laser displacement sensor are corrected based on the outer contour boundary images acquired by the camera, thereby improving the measurement accuracy of the laser displacement sensor when measuring different magnetic liquids and liquid surface shapes. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the magnetic liquid level measurement and calibration device of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the sealing housing and magnetic ring assembly in the diagram; Figure 3 For the present invention Figure 1 A schematic diagram showing the orientation of the camera and laser displacement sensor.

[0017] The attached diagram shows the markings and corresponding component names: 1. Camera, 2. Laser displacement sensor, 3. Sensor bracket, 4. Base plate, 5. Slide table, 6. Sealing housing, 6a. Connecting hole, 7. Magnetic ring, 8. Magnetic liquid ring. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0019] Unless otherwise defined, 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 application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0020] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0023] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0024] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0025] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0026] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0027] Please refer to Figure 1 and Figure 2 This application provides a magnetic liquid level measurement and calibration device, including a slide table 5, a sealed housing 6, a camera 1, and a laser displacement sensor 2. There are two sealed housings 6 arranged opposite each other, each with a magnetic ring 7 at one opposite end. A magnetic liquid ring 8 is disposed between the two magnetic rings 7. The slide table 5 is mounted on a base plate 4, and both sealed housings 6 are connected to the slide table 5 so that the distance between the two magnetic rings 7 is adjustable. The camera 1 is tangentially aligned with the outer surface of the magnetic liquid ring 8 in a certain direction, and the laser displacement sensor 2 is radially aligned with the outer surface of the magnetic liquid ring 8 in the same direction. A vacuum component is connected to the sealed housing 6 to change the vacuum level inside the sealed housing 6.

[0028] Specifically, the two sealing shells 6 are arranged opposite each other along the same axis, so that the two magnetic rings 7 are arranged coaxially opposite each other and maintain a certain distance between their ends. Magnetic fluid is filled between the ends of the two magnetic rings 7. Under the action of the magnetic rings 7, the magnetic fluid forms a ring-shaped distribution, which is the magnetic fluid ring 8 described in this application. It should be noted that the above orientation is the circumferential angular orientation with the axis of the magnetic fluid ring as the center.

[0029] In this application, the two magnetic rings 7 are arranged horizontally, the camera 1 is arranged vertically above the magnetic liquid ring 8, and the laser displacement sensor 2 is arranged horizontally on one side of the magnetic liquid ring 8. The shooting direction of the camera 1 is tangentially aligned with the outer ring of the magnetic liquid ring 8, and the laser emission direction of the laser displacement sensor 2 is aligned with the center of the magnetic liquid ring 8 in the same direction. The arrangement of the camera 1 and the laser displacement sensor 2 is as follows: Figure 3 As shown. Among them, camera 1 can be used to acquire the outer contour boundary image of the annular outer surface of the magnetic liquid in this orientation. This image is equivalent to the actual liquid surface contour line of the magnetic liquid. Laser displacement sensor 2 can be used to acquire the liquid surface contour line of the annular outer surface of the magnetic liquid in this orientation.

[0030] In the aforementioned device, the magnetic ring 7 is mounted on the sealed housing 6. When the slide table 5 operates, it can drive the two sealed housings 6 to move relative to each other, thereby changing the distance between the two magnetic rings 7. A vacuum component can be used to evacuate the sealed housing 6, causing a change in the vacuum within the sealed housing 6, which in turn changes the vacuum level inside the magnetic ring 7. Therefore, the device in this application can obtain a series of magnetic liquid annular outer surfaces with different curvatures and slopes by adjusting the distance between the two magnetic rings 7, the volume of magnetic fluid filling the space between the two magnetic rings 7, and the vacuum level in the sealed housing 6.

[0031] In this application, the liquid surface contour line acquired by the laser displacement sensor 2 can be corrected based on the outer contour boundary image acquired by the camera 1, and the correspondence between the liquid surface contour line acquired by the laser displacement sensor 2 under different curvatures and inclinations and the actual liquid surface contour line of the magnetic liquid can be established, thereby improving the measurement accuracy of the laser displacement sensor 2 when measuring different magnetic liquids and liquid surface shapes.

[0032] According to some embodiments of this application, the end of the sealing housing 6 is provided with a circular groove that matches the outer diameter of the magnetic ring 7, and one end of the magnetic ring 7 extends into the circular groove, forming a sealed connection between the two. The aforementioned circular grooves are respectively provided on the opposite end faces of the two sealing housings 6.

[0033] According to some embodiments of this application, the sealing housing 6 is provided with a connecting hole 6a. One end of the connecting hole 6a communicates with the inner side of the magnetic ring 7, and the vacuum component is connected to the other end of the connecting hole 6a. The connecting hole 6a can be a threaded hole, thereby facilitating connection with the vacuum component. One end of the connecting hole 6a communicates with a circular groove at the end of the sealing housing 6, and since the magnetic ring 7 has an annular structure, one end of the connecting hole 6a is in communication with the inner side of the magnetic ring 7.

[0034] According to some embodiments of this application, the vacuum component includes a vacuum pipe, one end of which is connected to the connection hole 6a, and the other end is connected to a vacuum device. The aforementioned vacuum device (such as a vacuum pump) performs evacuation through the vacuum pipe and the connection hole 6a, which can change the pressure inside the magnetic ring 7, thereby changing the contour of the annular outer surface of the magnetic liquid.

[0035] According to some embodiments of this application, the vacuum component further includes a vacuum gauge, which is disposed on the vacuum pipe. By providing the vacuum gauge, it is convenient to control the vacuum level within the sealed housing 6. It should be noted that the specific structure of the aforementioned vacuum component is not shown in the figures.

[0036] According to some embodiments of this application, the laser displacement sensor 2 is mounted on the base plate 4 via a sensor bracket 3, and both the horizontal mounting position of the sensor bracket 3 and the vertical mounting position of the laser displacement sensor 2 are adjustable, thereby facilitating the adjustment of the position of the laser displacement sensor 2 in the horizontal and vertical directions.

[0037] According to some embodiments of this application, the sensor bracket 3 is a T-shape composed of a horizontal plate and a vertical plate. The horizontal plate and the vertical plate are each provided with a waist-shaped groove. The horizontal plate is connected to the base plate 4, and the vertical plate is used to mount the laser displacement sensor 2. Specifically, as follows... Figure 1 As shown, waist-shaped grooves are respectively provided on the horizontal plate and the vertical plate. The adjustable feature of the waist-shaped grooves allows for easy adjustment of the position of the laser displacement sensor 2 so that its laser emission direction is aligned with the center of the magnetic liquid ring 8.

[0038] It should be noted that the camera 1 in this application can also be mounted using a corresponding bracket. Those skilled in the art can design a suitable bracket structure as needed, so it is not shown in the figure.

[0039] According to some embodiments of this application, the slide table 5 includes a guide rail, a slider, a lead screw, and a motor. The guide rail and the lead screw are both arranged along the axial direction of the magnetic ring 7. The lead screw is provided with two external threads with opposite directions. There are two sliders mounted on the guide rail. The two sliders are respectively provided with internal threads and are connected to the two external threads on the lead screw. The output shaft of the motor is connected to the end of the lead screw.

[0040] In this application, by utilizing two external threads with opposite directions on the lead screw, the two sliders can maintain synchronous and centered movement when the motor drives the lead screw to rotate. This ensures that the two sealed housings 6 and the magnetic ring 7 also move synchronously and centered. Thus, even if the distance between the two magnetic rings 7 changes, the center position between the two magnetic rings 7 remains unchanged, eliminating the need to adjust the horizontal position of the laser displacement sensor 2.

[0041] According to some embodiments of this application, the bottom of the sealing housing 6 is provided with a mounting hole for connecting to the slider on the slide table 5. It should be noted that the mounting hole is not shown in the figures.

[0042] This application provides a calibration method for a magnetic liquid level measurement calibration device as described above, comprising the following steps: Construct a magnetic liquid annular outer surface whose curvature and slope can be dynamically adjusted; A camera 1 is installed in the tangential direction at a certain position on the magnetic liquid toroidal surface, and a laser displacement sensor 2 is installed in the radial direction at the same position on the magnetic liquid toroidal surface. Camera 1 is used to acquire the outer contour boundary image of the annular outer surface of the magnetic liquid in this orientation, and laser displacement sensor 2 is used to acquire the liquid surface contour line of the annular outer surface of the magnetic liquid in this orientation. The liquid surface contour line acquired by the laser displacement sensor 2 is corrected based on the outer contour boundary image acquired by the camera 1, and the correspondence between the liquid surface contour line acquired by the laser displacement sensor 2 under different curvatures and inclinations and the actual liquid surface contour line of the magnetic liquid is established.

[0043] The calibration method employs the aforementioned magnetic liquid level measurement calibration device. By adjusting the distance between the two magnetic rings 7, the volume of magnetic liquid filling the space between the two rings 7, and the vacuum level in the sealed housing 6, a series of magnetic liquid annular outer surfaces with different curvatures and inclinations can be obtained. The liquid surface contour line acquired by the laser displacement sensor 2 is corrected based on the outer contour boundary image acquired by the camera 1, and a correspondence is established between the liquid surface contour lines acquired by the laser displacement sensor 2 under different curvatures and inclinations and the actual liquid surface contour lines of the magnetic liquid. This improves the measurement accuracy of the laser displacement sensor 2 when measuring different magnetic liquids and liquid surface shapes.

[0044] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A magnetic liquid level measurement and calibration device, characterized in that, The device includes a slide, a sealed housing, a camera, and a laser displacement sensor. There are two sealed housings arranged opposite each other, each with a magnetic ring at one end. A magnetic liquid ring is positioned between the two magnetic rings. The slide is mounted on a base plate, and both sealed housings are connected to the slide to allow for adjustable distance between the magnetic rings. The camera is tangentially aligned with the outer surface of the magnetic liquid ring in a certain direction, and the laser displacement sensor is radially aligned with the outer surface of the magnetic liquid ring in the same direction. A vacuum component is connected to the sealed housing to change the vacuum level within it.

2. The magnetic liquid level measurement and calibration device according to claim 1, characterized in that, The end of the sealing housing is provided with a circular groove that matches the outer diameter of the magnetic ring, and one end of the magnetic ring extends into the circular groove, forming a sealed connection between the two.

3. The magnetic liquid level measurement and calibration device according to claim 1, characterized in that, The sealing housing is provided with a connection hole, one end of which is connected to the inner side of the magnetic ring, and the vacuum component is connected to the other end of the connection hole.

4. The magnetic liquid level measuring and calibration device according to claim 3, characterized in that, The vacuum component includes a vacuum pipe, one end of which is connected to the connection hole and the other end of which is connected to a vacuum device.

5. The magnetic liquid level measurement and calibration device according to claim 4, characterized in that, The vacuum component also includes a vacuum gauge, which is mounted on the vacuum pipe.

6. The magnetic liquid level measurement and calibration device according to claim 1, characterized in that, The laser displacement sensor is mounted on the base plate via a sensor bracket, and both the horizontal mounting position of the sensor bracket and the vertical mounting position of the laser displacement sensor are adjustable.

7. The magnetic liquid level measurement and calibration device according to claim 6, characterized in that, The sensor bracket is a T-shaped structure consisting of a horizontal plate and a vertical plate. The horizontal plate and the vertical plate are respectively provided with waist-shaped grooves. The horizontal plate is connected to the base plate, and the vertical plate is used to install the laser displacement sensor.

8. The magnetic liquid level measurement and calibration device according to claim 1, characterized in that, The slide table includes a guide rail, sliders, a lead screw, and a motor. The guide rail and the lead screw are both arranged along the axial direction of the magnetic ring. The lead screw is provided with two external threads with opposite directions. There are two sliders mounted on the guide rail. The two sliders are respectively connected to the two external threads on the lead screw. The output shaft of the motor is connected to the end of the lead screw.

9. The magnetic liquid level measurement and calibration device according to claim 8, characterized in that, The bottom of the sealed housing is provided with a mounting hole for connecting to the slider on the slide table.

10. A calibration method for a magnetic liquid level measuring and calibration device according to any one of claims 1-9, characterized in that, Includes the following steps: Construct a magnetic liquid annular outer surface whose curvature and slope can be dynamically adjusted; A camera is set up in the tangential direction at a certain position on the magnetic fluid toroidal surface, and a laser displacement sensor is set up in the radial direction at the same position on the magnetic fluid toroidal surface. The outer contour boundary image of the annular outer surface of the magnetic liquid in this orientation is acquired using a camera, and the liquid surface contour line of the annular outer surface of the magnetic liquid in this orientation is acquired using a laser displacement sensor. The liquid surface contour line acquired by the laser displacement sensor is corrected based on the outer contour boundary image acquired by the camera, and the correspondence between the liquid surface contour line acquired by the laser displacement sensor under different curvatures and slopes and the actual liquid surface contour line of the magnetic liquid is established.

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