A fixing structure for a load measuring device and a measuring device comprising the same

Abstract

The present disclosure provides a fixing structure for a load measuring device and a measuring device comprising the same. The fixing structure comprises a first mounting seat and a second mounting seat. The first mounting seat has a first back surface fixedly connected with a cable outlet end support seat and a first mounting end surface opposite to the first back surface, and a first mounting groove is arranged in a central region of the first mounting end surface. The second mounting seat has a second back surface fixedly connected with a tail end support seat and a second mounting end surface opposite to the second back surface, and a second mounting groove is arranged in a central region of the second mounting end surface. By arranging the mounting grooves, the present disclosure can standardize the amount of glue, reduce the problem of optical path misalignment caused by the volume shrinkage of glue and the difference in installation methods, and at the same time, the specific structure points on the grooves can provide a reference for installation, improve the installation consistency and measurement reliability.

Description

Technical Field

[0001] This application relates to the field of fiber optic sensing technology, and in particular to a fixed structure for a load measuring device and a measuring device comprising the same. Background Technology

[0002] White-light phase-shifting interferometry (PSI) is a high-precision displacement measurement method. Its principle is to calculate the cavity length change between the reflected light from the target surface and the reference surface by measuring the interference phase difference. Theoretically, it can achieve sub-micron or even nanometer-level resolution within the millimeter range. However, currently, this technology is mainly integrated into expensive industrial inspection instruments (such as geometry measuring instruments), and it has extremely high requirements for optical path stability, requiring two interferometric cavity mirrors to maintain strict parallelism and possess sub-arcsecond-level relative orientation accuracy.

[0003] When attempting to encapsulate the white-light phase-shifting interferometry principle into a sensor for field applications, significant technical obstacles were exposed during the actual installation process. Sensors typically require structural adhesive (fixing glue) to be bonded to the surface of the object being measured, but existing installation methods have the following inherent drawbacks:

[0004] First, the amount of adhesive used is difficult to control precisely. Too much or too little adhesive not only affects the bonding stiffness, but more importantly, excess adhesive overflows and sticks to the sensor body. During curing, unpredictable volume shrinkage occurs, which alters the initial cavity length and parallelism between the sensor's internal reference surface and the target surface. White light interference is extremely sensitive to the relative orientation of the two mirrors; even a slight shrinkage shift can cause a sharp drop in interference signal contrast or even complete failure. Too much adhesive will cause the bonding surfaces to shift due to the adhesive acting as a lubricant, making it impossible to adhere to the target location.

[0005] Second, there are significant differences in the operating techniques of installation technicians. Different workers vary in the force, direction, and time used in applying adhesive, aligning, pressing, and maintaining curing. For example, before the adhesive cures, workers may apply uneven pressure to ensure the sensor adheres to the object being measured, resulting in inconsistent adhesive layer thicknesses on the two mounting surfaces. This can cause irreversible tilting or twisting of the reference surface relative to the target surface. Even with auxiliary fixtures, different assembly habits can still introduce random errors, leading to inconsistent initial operating points (interference phase zero points) after sensor installation, severely compromising the consistency, repeatability, and reliability of measurements.

[0006] In summary, existing technologies lack a displacement measurement device that can be compatible with the high-precision characteristics of white light phase-shifting interferometry while effectively overcoming the problems of optical path misalignment and interference signal quality degradation caused by uncertainties in the amount of fixing adhesive and differences in the techniques of installation technicians. Therefore, how to reduce the stringent dependence of high-precision optical displacement sensors on on-site installation processes, especially the standardization of adhesive dosage, and achieve stable performance, is a technical problem that urgently needs to be solved in this field.

[0007] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0008] To address one or more of the aforementioned technical problems, such as achieving accurate glue dosage and more stable glue fixation, this disclosure provides a fixing structure for a load measuring device and a measuring device including the same, aiming to improve the installation consistency and fixation accuracy of the load measuring device through the design of the mounting and fixing parts.

[0009] In a first aspect of this disclosure, a fixing structure for a load measuring device is provided, the load measuring device comprising: a displacement component and a fixing component; the displacement component comprising an inner tube and an outer tube; the outer tube being disposed on the outer surface of the inner tube; the inner surface of the outer tube abutting against the outer surface of the inner tube to form a relative displacement structure, and the central axis of the inner tube coinciding with the central axis of the outer tube; the fixing component comprising a cable outlet support and a tail end support; wherein the fixing structure is provided with a first mounting base and a second mounting base; the first mounting base having a first back surface capable of being fixedly connected to the cable outlet support and a first mounting end surface facing opposite to the first back surface; a first mounting groove being provided in the central region of the first mounting end surface; the second mounting base having a second back surface capable of being fixedly connected to the tail end support and a second mounting end surface facing opposite to the second back surface; a second mounting groove being provided in the central region of the second mounting end surface.

[0010] Furthermore, in some embodiments, the first mounting end face is configured as a rectangular structure, and two short sides of the rectangular structure are configured to be parallel to the central axis of the outer sleeve; the other two long sides of the rectangular structure are configured to be perpendicular to the central axis of the outer sleeve.

[0011] Furthermore, in some embodiments, viewed from a top view toward the first mounting end face, the first mounting groove and the second mounting groove are respectively configured as elongated structures, with the long side of the elongated structure parallel to the long side of the rectangular structure.

[0012] Furthermore, in some embodiments, the first mounting groove and the second mounting groove are respectively provided with an upper stop point and a lower stop point. The upper stop point is set as the uppermost intersection point of the uppermost groove wall of the corresponding groove and the uppermost opening of the corresponding groove. The lower stop point is set as the lowermost intersection point of the lowermost groove wall of the corresponding groove and the lowermost opening of the corresponding groove. The line connecting the uppermost intersection point and the lowermost intersection point is set to be perpendicular to the central axis of the outer sleeve.

[0013] Furthermore, in some embodiments, the line connecting the upper and lower ends of the first mounting groove is set as a first center line, and the line connecting the upper and lower ends of the second mounting groove is set as a second center line; the first center line and the second center line can be set to a given distance.

[0014] Furthermore, in some embodiments, the short side of the aforementioned elongated structure is configured as an outward-facing arc structure.

[0015] Furthermore, in some embodiments, the distance between the two long sides of the strip structure is set to be equal to the shortest distance between either of the two long sides and the edge of the rectangular structure that is closest to either of the long sides.

[0016] Furthermore, in some embodiments, the first mounting groove described above is set to a given depth.

[0017] Furthermore, in some embodiments, the outer sleeve is configured to be glued to the cable outlet support.

[0018] A second aspect of this disclosure also provides a load measuring device, which includes the fixing structure as described above.

[0019] The beneficial effects of this disclosure are as follows: In some embodiments, by providing corresponding first and second mounting grooves on the first and second mounting seats of the fixed structure, and by controlling the groove accommodating volume, installation technicians can use a uniform amount of adhesive to install the load measuring device (because too much or too little adhesive will affect the installation quality). Furthermore, in some embodiments, by providing upper and lower stops, and corresponding uppermost and lowermost intersection points, respectively, for the first and second mounting grooves, and by setting the line connecting the uppermost and lowermost intersection points perpendicular to the central axis of the outer sleeve, the line connecting the upper and lower stops of the first mounting groove is set as the first center line, and the line connecting the upper and lower stops of the second mounting groove is set as the second center line. By setting the distance between the first and second center lines, installation technicians can easily confirm the installation reference, which facilitates more accurate application, alignment, pressing, and curing procedures, thereby greatly improving the installation and fixing quality. Attached Figure Description

[0020] The above and other features, advantages and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description, wherein: Figure 1 A schematic diagram of a white light interferometric MEMS fiber optic load measurement device according to an embodiment of the present disclosure is shown; Figure 2 A schematic diagram of a white light interferometric MEMS fiber optic load measurement device with a fixed structure is shown according to an embodiment of the present disclosure; Figure 3 A schematic diagram from another perspective is shown of a white light interferometric MEMS fiber optic load measurement device with a fixed structure according to an embodiment of the present disclosure; Figure 4 A schematic diagram of the fixing structure according to an embodiment of the present disclosure is shown from a top view toward its fixing end face; Figure 5 A schematic diagram of a fixing structure according to an embodiment of the present disclosure is shown from another perspective; Figure 6 A schematic diagram of a fixing structure according to an embodiment of the present disclosure is shown from another perspective; In the various figures, the same or corresponding reference numerals indicate the same or corresponding parts, wherein: 112, inner tube; 114, outer tube; 132, cable outlet support; 132-1, cable outlet mounting base; 132-1-1, first mounting end face; 132-1-1A, first back face; 132-1-2, first mounting groove; 132-1-3, upper stop point; 132-1-4, lower stop point; 134, tail end support; 134-1, tail end mounting base; 134-1-1, second mounting end face; 134-1-1A, second back face; 150, object under test. Detailed Implementation

[0021] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0022] In the description of embodiments of this disclosure, the term "comprising" and similar terms should be understood as open-ended inclusion, i.e., "including but not limited to". The term "based on" should be understood as "at least partially based on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0023] Generally, a load measuring device can be a strain sensor, used to monitor the strain of an object. The strain sensor is fixed to the surface of the object being measured by means of glue, welding, bolts, etc., with the fixing points typically located at the two endpoints of the sensor (let's say points A and B). The distance between the two fixing points is commonly called the gauge length of the sensor. When strain occurs on the surface of the object being measured, the strain can be transmitted through the two fixing points to the strain sensor body, causing a change in the output signal of the internal components of the sensor, thereby achieving strain measurement. To improve measurement accuracy, white light phase-shifting interferometry (PSI) is introduced. PSI emits light within a specific wavelength range onto a target surface and a reference surface, resulting in optical interference between the reflected light from the target surface and the reference surface. The phase between the reflected light from the target surface and the reference surface is related to the distance between the target surface and the reference surface. By using phase measurement methods to obtain the phase difference of multiple interference fringes, the distance between the target surface and the reference surface can be calculated. Using this technology, displacement measurements can reach the nanometer level within a small range (typically 0.5 mm), and can reach the 0.1 μm level within a 10 mm range. Compared to the aforementioned vibrating wire, resistance strain gauge, and fiber optic strain measurement principles, this method offers significant improvements in both measurement accuracy and measurement range.

[0024] However, in white light interferometry, due to the limitations of phase measurement methods, the white light phase-shifting interferometry principle inherently possesses extremely high displacement measurement accuracy, but its accuracy places high demands on structural design. This technology has high requirements for the position and orientation between the incident light, the reference plane, and the target plane. When the sensor is installed on the surface of the object being measured, strain or displacement of the sensor structure due to the object being measured can easily lead to optical interference failure. The embodiments of this disclosure mainly discuss how to effectively fix the sensor to the surface of the object being measured, particularly by using adhesive. A common problem is the difficulty in precisely controlling the amount of adhesive used. Too much or too little adhesive will prevent the sensor from being accurately pasted at the target position. Furthermore, significant differences in the installation techniques of technicians can lead to inconsistent initial operating points (interference phase zero points) after sensor installation, severely compromising the consistency, repeatability, and reliability of the measurement.

[0025] To address at least one of the aforementioned problems, and one or more other potential problems, exemplary embodiments of this disclosure provide a fixing structure for a load measuring device, wherein the load measuring device includes a displacement component and a fixing component. Generally, the displacement component includes an inner tube and an outer tube; the outer tube is configured to fit over the outer surface of the inner tube; and the inner surface of the outer tube abuts against the outer surface of the inner tube to form a relatively displaceable structure, with the central axis of the inner tube coinciding with the central axis of the outer tube. Further, the fixing component includes a cable outlet support and a tail end support, the corresponding exemplary structures of which can be as follows: Figure 1 As shown. In Figure 1 In the example implementation, the MEMS fiber optic displacement sensor includes: a displacement component, which includes an inner tube 112 and an outer tube 114 capable of relative movement; the white light interferometric MEMS fiber optic displacement sensor also includes a fixing component, which includes two support seats respectively disposed at the cable output end (left end in the diagram) and the tail end (right end in the diagram) of the white light interferometric MEMS fiber optic displacement sensor, namely the cable output end support seat 132 and the tail end support seat 134 shown in the diagram. Specifically, based on Figure 1 See also Figure 2 and Figure 3 The device has a cable-out mounting base 132-1 and a tail mounting base 134-1 for connecting to the object being measured 150. Ideally, when the MEMS fiber optic displacement sensor measures displacement, the movement should occur along the central axis (two-dimensional direction) of the inner tube 112 and the outer tube 114. However, this coaxial displacement requires precise installation of the MEMS fiber optic displacement sensor. Specifically, if installers use inappropriate amounts of adhesive on the mounting surfaces of the cable-out mounting base 132-1 and the tail mounting base 134-1, the MEMS fiber optic displacement sensor is prone to deviating from the intended mounting axis. Furthermore, even if installers mark the mounting points beforehand, the liquid adhesive still retains some lubricating properties, causing deviation from the intended mounting axis during pressing. Furthermore, this fixed installation aims for a more abundant application of adhesive towards the center of the mounting surface, gradually thinning out towards the edges. However, due to unevenness of the mounting surfaces (including the inherent unevenness of the mounting surfaces of the cable-out end mount 132-1 and the tail end mount 134-1, as well as the unevenness of the surface being mounted), undesirable situations may arise, such as excessive adhesive on the outer periphery and insufficient adhesive on the inner surface. In addition, potential misalignment during installation can cause the distance between the cable-out end mount 132-1 and the tail end mount 134-1 to deviate from the set gauge length requirements, thereby affecting the monitoring accuracy and stability of the MEMS fiber optic displacement sensor due to installation issues. It should be understood that in Figure 1 In this configuration, the MEMS fiber optic displacement sensor is not equipped with the cable end mounting bracket 132-1 and the tail end mounting bracket 134-1. It should also be understood that, see also... Figure 2-3 and combined Figure 1 The cable exit mounting base 132-1 is fixedly mounted on the cable exit support base 132 via a first back surface 132-1-1A (e.g., via a slot provided on the first back surface 132-1-1A); similarly, the tail end mounting base 134-1 is fixedly mounted on the tail end mounting base 134-1 via a second back surface 134-1-1A (e.g., also via a slot provided on the second back surface 134-1-1A). Specifically, in Figure 3In the process, the MEMS fiber optic displacement sensor is mounted and fixed on the surface of the object being measured 150 via the cable-out end mounting bracket 132-1 and the tail end mounting bracket 134-1; it should also be understood that, due to Figure 3 This is a side view of the MEMS fiber optic displacement sensor mounted and fixed on the surface of the object being measured 150. Therefore, the first mounting end face 132-1-1, the first back face 132-1-1A facing opposite to the first mounting end face 132-1-1, the second mounting end face 134-1-1, and the second back face 134-1-1A facing opposite to the second mounting end face 134-1-1 are all presented as a straight line in the diagram. Note that, see [reference] Figure 2 As shown, and can be referenced. Figure 1 as well as Figures 3 to 6 In various embodiments of this disclosure, the fixing structure for the load measuring device may be provided with a cable outlet mounting base 132-1, and in other embodiments, the fixing structure may be provided with a tail end mounting base 134-1; while Figure 2 In an example embodiment, a load measuring device is shown that is equipped with the fixing structure of the present disclosure (i.e., the cable end mounting base 132-1 and the tail end mounting base 134-1 are assembled simultaneously); in other words, in some embodiments of the present disclosure, the first mounting base may specifically refer to the cable end mounting base; correspondingly, in other embodiments, the second mounting base may specifically refer to the tail end mounting base.

[0026] Therefore, to solve the above-mentioned technical problems, the following explanation is provided in conjunction with the accompanying drawings. It should be noted that in the embodiments of this disclosure, the term "outgoing cable end" refers to the end closest to the optical fiber or optical cable or the optical cable fixing structure, while "tail end" refers to the other end opposite the outgoing cable end.

[0027] Regarding the basic fixed structure Figure 4 A schematic diagram of a fixing structure according to an embodiment of the present disclosure is shown from a top view toward its fixing end face. In this illustrated embodiment, and in conjunction with... Figure 5-6The first mounting base shown can be considered as a fixed structure. This first mounting base has a first back surface (not shown) that can be fixedly connected to a cable outlet support (not shown), and a first mounting end face 132-1-1 facing opposite to the first back surface (not shown). A first mounting groove 132-1-2 is provided in the central region of the first mounting end face 132-1-1. It should be understood that the first mounting base can be, for example, the cable outlet mounting base 132-1. Similarly, the second mounting base can be, for example, the tail end mounting base 134-1. The second mounting base can also have a second mounting groove in the central region of the second mounting end face, similar to the illustrated embodiment. Therefore, by providing corresponding first and second mounting grooves in the first and second mounting bases of the fixed structure, and by controlling the groove accommodating volume, installation technicians can help install the load measuring device with a uniform amount of adhesive (because too much or too little adhesive will affect the installation quality). It should also be understood that, see also... Figure 3 As shown, the so-called opposite orientation of the first back face 132-1-1A and the first mounting face 132-1-1 on the cable outlet mounting base 132-1 means that in the figure, the first back face 132-1-1A faces downwards from the paper, while the first mounting face 132-1-1 faces upwards from the paper. Therefore, the first back face 132-1-1A and the first mounting face 132-1-1 have opposite orientations. Similarly, Figure 3 The second back face 134-1-1A is clearly shown to be facing the opposite direction to the second mounting end face 134-1-1.

[0028] Regarding the rectangular or rectangular structure of the mounting end face. Further, in some embodiments, the first mounting end face is configured as a rectangular structure, because two of the shorter sides of the rectangular structure (in...) Figure 4 In the example embodiment, it can be seen that the four corners of the mounting end face are processed into arc shapes, but its upper and lower sides are still the two shorter sides) are set to be parallel to the central axis of the outer tube (this setting of the short sides can still be used to help determine whether the short sides are parallel to the central axis of the outer tube during installation); the rectangular structure allows the other two long sides to be set to be perpendicular to the central axis of the outer tube (this is also an auxiliary function, used to confirm whether the long sides are perpendicular to the central axis of the outer tube during installation).

[0029] Regarding the shape and orientation of the groove. In some embodiments, such as Figure 4 As shown, viewed from a top view towards the first mounting end face 132-1-1, the first mounting groove 132-1-2 and the second mounting groove (not shown) are respectively configured as elongated structures, the long side of which is parallel to the long side of the rectangular structure. Furthermore, the short side of the elongated structure is configured as an outward-facing arc structure to avoid stress concentration and facilitate adhesive flow.

[0030] Regarding the reference points (top dead center, bottom dead center) on the groove. In some embodiments, see still [reference needed]. Figure 4 Referring to the other accompanying drawings, the first mounting groove 132-1-2 is provided with an upper stop point 132-1-3 and a lower stop point 132-1-4. The so-called upper stop point 132-1-3 is set as the intersection of the uppermost groove wall of the elongated groove and the uppermost opening of the groove (which can also be described as the intersection of the uppermost opening of the first mounting groove 132-1-2 and the first mounting end face 132-1-1). This point is an auxiliary working point; it can be a specially created point or a predetermined point, but it does physically exist. Correspondingly, the lower stop point 132-1-4 is set as the intersection of the lowermost groove wall of the elongated groove and the lowermost opening of the groove (which can also be described as the intersection of the lowermost opening of the first mounting groove 132-1-2 and the first mounting end face 132-1-1). Similarly, this point is also an auxiliary working point; it can be a specially created point or a predetermined point, but it does physically exist. The line connecting the upper stop point 132-1-3 and the lower stop point 132-1-4 (i.e., the uppermost intersection point and the lowermost intersection point) is set to be perpendicular to the central axis of the outer sleeve. It should be understood that by setting the upper stop point and the lower stop point, i.e., the corresponding uppermost intersection point and lowermost intersection point, on the first mounting groove 132-1-3 and the second mounting groove (not shown), respectively, and setting the line connecting the uppermost intersection point and the lowermost intersection point to be perpendicular to the central axis of the outer sleeve, the line connecting the upper stop point 132-1-3 and the lower stop point 132-1-4 based on the first mounting groove 132-1-2 is set as the first center line, and the line connecting the upper stop point and the lower stop point of the second mounting groove (not shown) is set as the second center line. By setting the distance between the first center line and the second center line, it is convenient for installation technicians to confirm the installation reference, which is beneficial for installation technicians to take more accurate procedures such as applying adhesive, aligning, pressing, and maintaining curing.

[0031] Regarding the distance between the groove and the edge of the end face: In some preferred embodiments, to balance the function of fixing the adhesive area and storing a fixed amount of adhesive, the distance between the two long sides of the above-mentioned strip structure (i.e., the width of the groove of the strip structure) is set as the distance between one of the two long sides and the edge of the long side of the rectangular structure closest to it. In other words, the width of the groove is approximately equal to the distance from the long side of the groove to the corresponding long side edge of the mounting end face, so that the edge portion of the mounting end face has a roughly uniform width, which is beneficial to ensuring the bonding strength.

[0032] Regarding the given depth of the groove: In some preferred embodiments, to ensure that the amount of adhesive used by the installation technician is standardized, the first installation groove is set to a given depth (e.g., 0.5 mm to 2 mm). During installation, the operator only needs to completely fill the groove with adhesive to obtain a standardized amount of adhesive, thereby avoiding errors caused by human estimation of adhesive amount.

[0033] Regarding other connection methods, in some alternative embodiments, for the purpose of full disclosure, the outer sheath is configured to be glued to the cable outlet support. Of course, other known connection methods can also be used, such as welding, threaded connections, or interference fits.

[0034] Regarding various variations of the groove structure: In addition to the elongated groove described above, in some other alternative embodiments, the first mounting groove and / or the second mounting groove can also adopt other shapes capable of accommodating a measured amount of adhesive and providing a mounting reference. For example: Multiple parallel grooves: Two or more parallel elongated grooves are provided on the mounting end face to increase the contact area between the adhesive and the end face, thereby improving the bonding strength. Cross grooves: Intersecting grooves (e.g., cross-shaped or X-shaped) can provide adhesive flow channels and alignment references in multiple directions. Matrix recesses: Multiple discrete circular or square recesses are provided in the central area of ​​the mounting end face, and the amount of adhesive is standardized by controlling the total volume of the recesses. The depth and diameter of each recess can be designed as needed. Annular grooves: One or more concentric annular grooves are provided in the center of the mounting end face, which is particularly suitable for cylindrical mounts and can provide uniform adhesive distribution. It should also be understood that for the first mounting groove, the short side of the elongated structure is set as an outward-facing arc structure.

[0035] Regarding the roughness treatment of the inner wall of the groove: In some alternative embodiments, to improve the adhesion between the adhesive and the mounting base, the inner wall of the first and / or second mounting groove is configured with a surface having a predetermined roughness (e.g., forming a micron-level texture through sandblasting, etching, or machining). This rough surface can increase the mechanical locking force between the adhesive and the groove wall, reducing the risk of adhesive peeling due to thermal expansion and contraction or vibration.

[0036] Regarding the overall shape variation of the mounting end face: Although the first mounting end face is described as rectangular in the foregoing embodiments, in other embodiments, depending on the shape of the object being measured and the requirements of the mounting space, the first and / or second mounting end faces may also be set as circular, elliptical, hexagonal, or other polygonal shapes. In this case, to provide a directional reference, one or more positioning marks (e.g., scribing lines, holes, or protrusions) may be provided on the end face, and the lines connecting these positioning marks are set to be parallel to or perpendicular to the central axis of the outer sleeve.

[0037] It should be understood that the above embodiments illustrate a MEMS fiber optic displacement sensor, but other types of load measuring devices are also possible, as long as they include such a fixed structure and meet the requirement that the measured axis is coaxial with the measuring device.

[0038] Another aspect of this disclosure provides a load measuring device, which includes the fixed structure described in any of the above embodiments or combinations thereof. Specifically, this load measuring device can be a white-light interferometric MEMS fiber optic displacement sensor. Figures 1 to 3 As shown, the sensor includes an inner tube 112, an outer tube 114, a cable outlet support 132, and a tail end support 134. A cable outlet mounting base 132-1 (i.e., the first mounting base) is fixed to the cable outlet support 132, and a tail end mounting base 134-1 (i.e., the second mounting base) is fixed to the tail end support 134. The cable outlet mounting base 132-1 and the tail end mounting base 134-1 are respectively provided with mounting grooves as described in any of the previous embodiments. Through this fixing structure, the sensor can be fixed to the surface of the object being measured with high consistency and high reliability, thereby leveraging the high-precision measurement advantages of white light phase-shifting interferometry.

[0039] It should be understood that the above embodiments illustrate a MEMS fiber optic displacement sensor, but other types of load measuring devices (such as resistance strain gauge, capacitive or inductive displacement sensors) are also possible, as long as they include such a fixed structure and are applicable to scenarios where the measured axis is required to be coaxial with the measuring device.

[0040] It should be understood that the load measuring device in the various embodiments of this disclosure can employ a two-point measurement technique, measuring deformation (displacement) at two points, i.e., within the gauge length. Therefore, the installation area and requirements for the installation surface are greatly reduced; it is not necessary to polish the surface of the object being measured to an extremely fine finish, as long as it can be firmly bonded, effective measurement can be achieved.

[0041] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

[0042] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A fixing structure for a load measuring device, the load measuring device comprising: The device includes a displacement component and a fixing component. The displacement component includes an inner tube and an outer tube. The outer tube is configured to be sleeved on the outer surface of the inner tube. The inner surface of the outer tube abuts against the outer surface of the inner tube to form a structure that allows relative displacement, and the central axis of the inner tube coincides with the central axis of the outer tube. The fixing component includes a cable outlet support and a tail end support. Its features are, The fixing structure is provided with a first mounting base and a second mounting base; The first mounting base is provided with a first back side that can be fixedly connected to the cable outlet support base, and a first mounting end face that faces opposite to the first back side; a first mounting groove is provided in the central area of ​​the first mounting end face. The second mounting base is provided with a second back surface that can be fixedly connected to the tail end support, and a second mounting end surface that faces opposite to the second back surface; a second mounting groove is provided in the central area of ​​the second mounting end surface.

2. The fixing structure according to claim 1, characterized in that, The first mounting end face is configured as a rectangular structure, and the two short sides of the rectangular structure are configured to be parallel to the central axis of the outer sleeve; the other two long sides of the rectangular structure are configured to be perpendicular to the central axis of the outer sleeve.

3. The fixing structure according to claim 2, characterized in that, Viewed from a top angle toward the first mounting end face, the first mounting groove and the second mounting groove are respectively configured as elongated structures, with the long side of the elongated structure parallel to the long side of the rectangular structure.

4. The fixing structure according to claim 3, characterized in that, The first mounting groove and the second mounting groove are respectively provided with an upper stop point and a lower stop point. The upper stop point is set as the uppermost intersection point of the uppermost groove wall of the corresponding groove and the uppermost opening of the corresponding groove. The lower stop point is set as the lowermost intersection point of the lowermost groove wall of the corresponding groove and the lowermost opening of the corresponding groove. The line connecting the uppermost intersection point and the lowermost intersection point is set to be perpendicular to the central axis of the outer sleeve.

5. The fixing structure according to claim 4, characterized in that, The line connecting the upper and lower ends of the first mounting groove is set as the first center line, and the line connecting the upper and lower ends of the second mounting groove is set as the second center line; the first center line and the second center line are set at a given distance.

6. The fixing structure according to claim 3, characterized in that, The short side of the elongated structure is designed as an outward-facing arc.

7. The fixing structure according to claim 3, characterized in that, The distance between the two long sides of the strip structure is set to be equal to the shortest distance between either of the two long sides and the edge of the long side of the rectangular structure that is closest to either of the long sides.

8. The fixing structure according to claim 1, characterized in that, The outer sleeve is fixedly connected to the cable outlet support by adhesive bonding.

9. A load measuring device, characterized in that, Includes the fixed structure as described in any one of claims 1-8.

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