Optical fiber measurement vibration device based on moire fringes

Abstract

The utility model relates to an optical fiber measurement vibration device based on moire fringes, which comprises a grating sensor main body and a detection rod, a support ring is sleeved outside one end of the detection rod outside the grating sensor main body, and the support ring is in sliding connection with the grating sensor main body along the axial direction of the detection rod; a pushing block is arranged in the supporting ring, a hemispherical groove is formed in the side face, facing the grating sensor body, of the pushing block, and one end of the detection rod is inserted into the groove and abuts against the groove. A plurality of elastic supporting pieces are arranged between the pushing block and the supporting ring and evenly distributed in the circumferential direction of the supporting ring, and when the elastic supporting pieces are in a natural stretching state, the sphere center of the groove is located on the axis of the detection rod. The problems that in the prior art, the direction of relative movement of an indication grating and a scale grating is fixed, when external force applied to a detection rod is perpendicular to the movement direction of the indication grating, the indication grating and the scale grating are difficult to move relatively to generate a moire fringe phenomenon, and vibration measurement work has certain limitation are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring devices, and particularly relates to an optical fiber vibration measuring device based on Moiré fringes. Background Art

[0002] Moiré fringes are an optical phenomenon first discovered by Mr. Moiré, a French researcher in the 18th century. Technically speaking, Moiré fringes are the visual result of interference between two lines or two objects at a constant angle and frequency. When the human eye cannot distinguish these two lines or two objects, only the interference pattern can be seen, and the pattern in this optical phenomenon is Moiré fringes.

[0003] In the prior art, a grating sensor (also known as a grating transducer) is a device that uses the Moiré fringe phenomenon to measure vibration. The grating transducer consists of four parts: a scale grating, an indicating grating, an optical path system, and a measuring system. When the scale grating moves relative to the indicating grating, overlapping grating fringes that are roughly sinusoidally distributed in light and dark are formed. These fringes move at the relative movement speed of the gratings and directly irradiate onto the optoelectronic elements. A series of electrical pulses are obtained at their output terminals, and digital signals are generated through an amplification, shaping, direction discrimination, and counting system, directly displaying the measured displacement. The advantages of this sensor are a large measuring range and high accuracy. Grating transducers are used in programmed control, numerical control machine tools, and three-coordinate measuring mechanisms, and can measure static and dynamic linear displacements. They are also used in fields such as mechanical vibration measurement and deformation measurement.

[0004] When in use, the scale grating of the grating transducer is usually fixed on a relatively stationary part of a machine tool or equipment or a part with a determined movement trajectory. For example, it may be installed on the workbench of a machine tool, a lead screw, or the fixed template of a die-opening device. This installation method ensures that the scale grating remains relatively stable during the measurement process, thus providing an accurate measurement reference.

[0005] The indicating grating is usually installed on a probe rod, and the probe rod is installed on a fixed part of the machine tool or equipment, such as the machine tool base. When the workbench or other moving parts of the machine tool move, the probe rod drives the indicating grating to move relative to the scale grating. The displacement of the moving parts of the machine tool is measured by detecting the relative displacement between the scale grating and the indicating grating.

[0006] However, the relative movement direction between the indicating grating and the scale grating is fixed. When an external force applied to the probe rod is perpendicular to the movement direction of the indicating grating, it is difficult for the indicating grating and the scale grating to have relative movement to generate the Moiré fringe phenomenon, making the vibration measurement work have certain limitations. Summary of the Utility Model

[0007] In view of this, the purpose of the present utility model is to provide an optical fiber vibration measuring device based on Moiré fringes, so as to solve the problem that in the prior art, the relative movement direction between the indicating grating and the scale grating is fixed. When the external force applied to the detection rod is perpendicular to the movement direction of the indicating grating, it is difficult for the relative movement to occur between the indicating grating and the scale grating to generate the Moiré fringe phenomenon, which makes the vibration measurement work have certain limitations.

[0008] The present utility model is realized through the following technical solutions:

[0009] An optical fiber vibration measuring device based on Moiré fringes includes a grating sensor main body and a detection rod. A support ring is sleeved outside one end of the detection rod outside the grating sensor main body, and the support ring is slidably connected with the grating sensor main body along the axial direction of the detection rod;

[0010] A pushing block is arranged inside the support ring. A hemispherical groove is formed on one side of the pushing block facing the grating sensor main body, and one end of the detection rod is inserted into the groove and abuts against it;

[0011] A plurality of elastic support members are arranged between the pushing block and the support ring. The plurality of elastic support members are evenly distributed along the circumferential direction of the support ring. The outer side wall of the pushing block is flexibly supported by the plurality of elastic support members, and when the plurality of elastic support members are in the natural stretching state, the center of the groove is on the axis of the detection rod.

[0012] Further, a plurality of limiting blocks are arranged on the edge of the support ring on the side facing away from the grating sensor main body, and the plurality of limiting blocks are evenly distributed along the circumferential direction of the support ring. The pushing block is arranged between the plurality of limiting blocks, and a gap is left between the pushing block and the limiting blocks;

[0013] A pressing plate is connected to each of the plurality of limiting blocks, and the side of the pressing plate facing the grating sensor main body is attached to the side of the pushing block facing away from the grating sensor main body.

[0014] Further, the pressing plate is in the shape of an arc plate and is coaxial with the support ring. The pushing block is in the shape of a stepped shaft, and the diameter value of the inner circular surface of the pressing plate is smaller than the diameter value of the outer circular surface of one end of the pushing block facing the grating sensor main body.

[0015] Further, a first threaded hole is formed on the side of each of the plurality of limiting blocks facing away from the grating sensor main body. Through holes are formed on each of the plurality of pressing plates, and fastening bolts are arranged in the through holes;

[0016] The threaded end of the fastening bolt is sequentially inserted into the through hole and the corresponding first threaded hole, and is connected with the first threaded hole through threaded cooperation.

[0017] Further, the elastic support member is a first spring, and a limiting groove for installing the corresponding first spring is formed in the middle of the inner side surface of each of the plurality of limiting blocks;

[0018] The first spring is embedded in the limiting groove, and one end thereof is fixedly connected to the surface in the limiting groove facing away from the pushing block. When the plurality of first springs are naturally extended, the ends facing away from the corresponding limiting grooves all extend out of the limiting grooves and are all abutted against the outer side surface of the pushing block.

[0019] Furthermore, a coaxial sleeve is provided on one side of the support ring facing the grating sensor body. One end of the sleeve is connected to the grating sensor body, and the other end is provided with a plurality of support rods.

[0020] The plurality of support rods are uniformly distributed along the circumferential direction of the sleeve. One end of each support rod is fixedly connected to the sleeve, and the other end thereof penetrates through the support ring and is in sliding fit.

[0021] Furthermore, a second spring is sleeved outside the support rod. One end of the second spring is fixedly connected to the support rod, and the other end is fixedly connected to the support ring.

[0022] Furthermore, a connector is provided on the grating sensor body. An external thread is provided on the outer side surface of the connector. The sleeve is sleeved outside the connector and is connected through thread fit.

[0023] Furthermore, a sliding groove extending in the radial direction is provided on the inner side wall of the sleeve. A sliding block is in sliding fit in the sliding groove.

[0024] A second threaded hole is provided on the plane of the sliding groove facing away from the opening. A lead screw is connected in the second threaded hole through thread fit. One end of the lead screw is inserted into the sliding block and is in rotational fit, and the other end extends out of the sleeve.

[0025] Furthermore, a magnetic base is fixedly connected to one end of the pushing block facing away from the grating sensor body.

[0026] The beneficial effects of the present utility model are as follows:

[0027] For the fiber optic vibration measuring device based on Moiré fringes, a support ring is sleeved outside the detection rod, and the support ring is slidably connected to the grating sensor body along the axial direction of the detection rod. At the same time, a pushing block is arranged in the support ring, and the pushing block is flexibly supported by a plurality of elastic support members, so that the pushing block can move along the axial and radial directions of the detection rod; by providing a hemispherical groove on the pushing block and abutting the inner surface of the groove against the detection rod, when the pushing block moves radially along the detection rod, the inner surface of the groove applies a thrust along the axial direction of the detection rod to the detection rod, so that the detection rod slides axially, prompting relative movement between the indicating grating and the scale grating for vibration measurement and other operations, that is, external forces applied in different vibration directions to the pushing block can trigger the device.

[0028] Other advantages, objects and features of the present utility model will be set forth to some extent in the following description, and to some extent, will be apparent to those skilled in the art upon examination of the following, or may be learned from the practice of the present utility model. The objects and other advantages of the present utility model may be realized and obtained by the following description of the specification. Brief Description of the Drawings

[0029] Figure 1 It is a schematic three-dimensional structure diagram of an embodiment of the present utility model;

[0030] Figure 2 It is an exploded view of an embodiment of the present utility model;

[0031] Figure 3 It is a schematic three-dimensional structure diagram of a sleeve and a support rod in an embodiment of the present utility model;

[0032] Figure 4 It is a schematic three-dimensional structure diagram of a support ring and a push block in an embodiment of the present utility model;

[0033] Figure 5 It is a schematic three-dimensional structure diagram of a push block in an embodiment of the present utility model;

[0034] Figure 6 It is a schematic three-dimensional structure diagram of a pressing plate in an embodiment of the present utility model;

[0035] Figure 7 It is Figure 2 an enlarged view of part A in

[0036] Figure 8 It is a motion state diagram of an embodiment of the present utility model.

[0037] In the figure: the grating sensor main body 11, the connecting head 111, the detection rod 12, the magnetic base 13;

[0038] the support ring 21, the limit block 211, the first threaded hole 2111, the limit groove 2112, the pressing plate 212, the through hole 2121, the bolt 213, the push block 22, the groove 221, the first spring 23, the sleeve 24, the support rod 241, the second spring 242, the sliding groove 243, the second threaded hole 2431, the slider 244, the lead screw 245;

[0039] the starting point s1, the ending point s2, the center of the groove s3, the radius of the groove R, the radius of the ball head r, the radial distance value x, the axial distance value y. Detailed Description of the Embodiment

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] In the above description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "one side" and "the other side" is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, terms such as "first" and "second" are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0044] In addition, terms such as "identical" do not mean that the components are absolutely identical, but there may be slight differences. The term "perpendicular" only means that the positional relationship between components is more perpendicular relative to "parallel", and does not mean that the structure must be completely perpendicular, but can be slightly inclined.

[0045] Please refer to Figure 1-8 , the present utility model provides a technical solution: an optical fiber vibration measurement device based on Moiré fringes, including a grating sensor body 11 and a detection rod 12. A support ring 21 is sleeved outside one end of the detection rod 12 outside the grating sensor body 11, and the support ring 21 is slidably connected to the grating sensor body 11 along the axial direction of the detection rod 12;

[0046] A push block 22 is arranged inside the support ring 21. A hemispherical groove 221 is formed on one side of the push block 22 facing the grating sensor body 11, and one end of the detection rod 12 is inserted into the groove 221 and abuts against it;

[0047] A plurality of elastic support members are provided between the pushing block 22 and the support ring 21. The plurality of elastic support members are evenly distributed along the circumferential direction of the support ring 21. The outer side wall of the pushing block 22 is flexibly supported by the plurality of elastic support members. When the plurality of elastic support members are in a natural stretching state, the center of the groove 221 is on the axis of the detection rod 12.

[0048] During use, the grating sensor body 11 is fixedly installed on a machine tool or equipment by means of locking bolts or the like, and the pushing block 22 is fixedly installed on a workpiece or component to be measured by means of bonding or the like. That is, when the workpiece or component to be measured vibrates, the pushing block 22 vibrates on the grating sensor body 11. A support ring 21 is sleeved outside the detection rod 12, and the support ring 21 is slidably connected to the grating sensor body 11 along the axial direction of the detection rod 12. At the same time, a pushing block 22 is arranged inside the support ring 21, and the pushing block 22 is flexibly supported by a plurality of elastic support members, so that the pushing block 22 can move along the axial and radial directions of the detection rod 12; by providing a hemispherical groove 221 on the pushing block 22, and the inner curved surface of the groove 221 is in contact with and abuts against the detection rod 12. When the pushing block 22 moves radially along the detection rod 12, the inner curved surface of the groove 221 exerts a thrust along the axial direction of the detection rod 12 on the detection rod 12, so that the detection rod 12 slides axially, prompting the relative movement of the indicating grating and the scale grating, and performing operations such as measuring vibration. That is, the external forces applied to the pushing block 22 in different vibration directions can trigger the device.

[0049] A compression spring is provided on the grating sensor body 11. One end of the compression spring is fixedly connected to the grating sensor body 11, and the other end is fixedly connected to the detection rod 12 to flexibly support the detection rod 12, so that the detection rod 12 remains in a state of abutting against the inner curved surface of the groove 221, so as to stably detect the change of the movement state of the pushing rod.

[0050] One end of the detection rod 12 outside the grating sensor body 11 is spherical, and the diameter value is smaller than the diameter value of the groove 221, so as to facilitate the free sliding of the detection rod 12 in the groove 221; at the same time, during the relative movement of the detection rod 12 and the pushing block 22, the relative distance between the center of the spherical head and the center s3 of the groove 221 remains unchanged. That is, the distances from the starting point s1 and the ending point s2 to the center s3 of the groove 221 are both equal to the radius R of the groove 221 minus the radius r of the spherical head. y is the axial distance value of the starting point s1 and the ending point s2 along the detection rod 12, and x is the radial distance value. Since the radial direction and the axial direction of the detection rod 12 are perpendicular to each other, according to the Pythagorean theorem, it can be known that (R - r - y)2 + x2 = (R - r)2, where R and r can be measured and obtained in advance, and y can be obtained through the measurement system inside the grating sensor body 11, so as to calculate x, so as to obtain parameters such as the amplitude of the vibration of the workpiece and the pushing block 22.

[0051] In this embodiment: A plurality of limit blocks 211 are provided on the edge of the side of the support ring 21 facing away from the grating sensor body 11, and the plurality of limit blocks 211 are evenly distributed along the circumferential direction of the support ring 21. The pushing block 22 is arranged between the plurality of limit blocks 211, and a gap is left between the pushing block 22 and the limit blocks 211.

[0052] A pressing plate 212 is connected to each of the plurality of limit blocks 211, and the surface of the pressing plate 212 facing the grating sensor body 11 is attached to the surface of the pushing block 22 facing away from the grating sensor body 11.

[0053] The pushing block 22 is clamped by the plurality of pressing plates 212 and the support ring 21 to limit the free rotation of the pushing block 22, and then smoothly slide radially along the support ring 21, so that the transmission between the pushing block 22 and the detection rod 12 is more stable.

[0054] In this embodiment: The pressing plate 212 is in the shape of an arc plate and is coaxial with the support ring 21. The pushing block 22 is in the shape of a stepped shaft, and the diameter value of the inner circular surface of the pressing plate 212 is smaller than the diameter value of the outer circular surface of the end of the pushing block 22 facing the grating sensor body 11.

[0055] By splicing the plurality of pressing plates 212 to form an annular structure, and the diameter value of the inner circular surface of the pressing plate 212 is smaller than the diameter value of the outer circular surface of the end of the pushing block 22 facing the grating sensor body 11, the opening size in the middle of the annular structure is smaller than the outer shape size of the end of the pushing block 22 facing the grating sensor body 11, thereby preventing the pushing block 22 from moving out and falling off from the annular structure.

[0056] In this embodiment: A first threaded hole 2111 is formed on the side of each of the plurality of limit blocks 211 facing away from the grating sensor body 11. A through hole 2121 is formed on each of the plurality of pressing plates 212, and a fastening bolt 213 is arranged in the through hole 2121.

[0057] The threaded end of the fastening bolt 213 is sequentially inserted into the through hole 2121 and the corresponding first threaded hole 2111, and is connected to the first threaded hole 2111 through threaded fit.

[0058] By detachably connecting the pressing plate 212 to the limit block 211, it is convenient to repair and replace components such as the pushing block 22.

[0059] In this embodiment: The elastic support member is the first spring 23. A limit groove 2112 for installing the corresponding first spring 23 is formed in the middle of the inner side surface of each of the plurality of limit blocks 211.

[0060] The first spring 23 is embedded in the limit groove 2112, and one end thereof is fixedly connected to the surface in the limit groove 2112 facing away from the pushing block 22. When a plurality of the first springs 23 are naturally extended, the ends facing away from the corresponding limit grooves 2112 all extend out of the limit grooves 2112 and are all abutted against the outer side surface of the pushing block 22.

[0061] By providing the limit groove 2112 on the limit block 211 and embedding the first spring 23 in the limit groove 2112, the first spring 23 is laterally supported, and the probability of torsional damage of the first spring 23 is reduced.

[0062] In this embodiment: A coaxial sleeve 24 is provided on one side of the support ring 21 facing the grating sensor body 11. One end of the sleeve 24 is connected to the grating sensor body 11, and the other end is provided with a plurality of support rods 241.

[0063] The plurality of support rods 241 are evenly distributed along the circumferential direction of the sleeve 24. One end of the support rod 241 is fixedly connected to the sleeve 24, and the other end penetrates through the support ring 21 and is in sliding fit.

[0064] By providing a plurality of support rods 241 parallel to the detection rod 12 and connecting the plurality of support rods 241 in series on the support ring 21, the free rotation of the support ring 21 is restricted. At the same time, the support rod 241 is slidably connected to the support ring 21, so that the support ring 21 and the pushing block 22 can move axially along the detection rod 12, enabling the detection rod 12 to smoothly perform the work of measuring vibration.

[0065] In this embodiment: A second spring 242 is sleeved outside the support rod 241. One end of the second spring 242 is fixedly connected to the support rod 241, and the other end is fixedly connected to the support ring 21.

[0066] By sleeving the second spring 242 outside the support rod 241, the extrusion force received by the compression spring on the detection rod 12 is shared, and the probability of damage to the compression spring is reduced.

[0067] In this embodiment: A connector 111 is provided on the grating sensor body 11. An external thread is provided on the outer side surface of the connector 111. The sleeve 24 is sleeved outside the connector 111 and is connected by thread fit.

[0068] By connecting the sleeve 24 and the connector 111 by thread fit, the sleeve 24, the support ring 21 and the pushing block 22 can move axially along the detection rod 12, adjusting the relative position between the pushing block 22 and the detection rod 12, so that the pushing rod is inserted into the groove 221 and stably contacts and abuts against the inner curved surface of the groove 221, adjusting the length of the compression spring on the detection rod 12 that is squeezed and contracted when the pushing block 22 is static, further protecting the compression spring and reducing the probability of damage to the compression spring.

[0069] In this embodiment: a chute 243 extending radially is formed in the inner side wall of the sleeve 24, and a slider 244 is slidably engaged in the chute 243;

[0070] A second threaded hole 2431 is formed in the plane of the chute 243 facing away from the opening. A lead screw 245 is connected to the second threaded hole 2431 by screw fit. One end of the lead screw 245 is inserted into the slider 244 and rotatably engaged, and the other end extends out of the sleeve 24.

[0071] An internal thread adapted to the second threaded hole 2431 is formed at one end of the slider 244 facing away from the chute 243.

[0072] During use, when it is necessary to fix the positions of the sleeve 24 and the connector 111, the lead screw 245 is rotated forward. The lead screw 245 applies a thrust to the slider 244 towards the connector 111, causing the slider 244 to slide in the chute 243 and approach the connector 111 until the thread on the connector 111 is inserted into the bottom of the internal thread on the slider 244 and fits tightly. Under the action of the mutual friction force, the relative movement between the sleeve 24 and the connector 111 is restricted, so that the connector 111 and the detection rod 12 are stably in contact.

[0073] In this embodiment: a magnetic base 13 is fixedly connected to one end of the pushing block 22 facing away from the grating sensor body 11.

[0074] The pushing block 22 is magnetically attracted and fixed to an iron workpiece through the magnetic base 13, and the operation of generating or eliminating magnetism on the magnetic base 13 is simple and convenient, so as to quickly clamp the pushing block 22. Among them, the magnetic base 13 is a mature existing device, so there is no need to elaborate here.

[0075] Among them, the specific model of the grating sensor body 11 is Matsumoto Electric Machinery ED012-1A.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An optical fiber vibration measurement device based on Moiré fringes, comprising a grating sensor body (11) and a detection rod (12), characterized in that: One end of the detection rod (12) outside the grating sensor main body (11) is sleeved with a support ring (21), and the support ring (21) is slidably connected to the grating sensor main body (11) along the axial direction of the detection rod (12); A push block (22) is arranged inside the support ring (21). A hemispherical groove (221) is formed on one side of the push block (22) facing the grating sensor main body (11), and one end of the detection rod (12) is inserted into the groove (221) and abuts against it; A plurality of elastic support members are arranged between the push block (22) and the support ring (21). The plurality of elastic support members are evenly distributed along the circumferential direction of the support ring (21). The outer side wall of the push block (22) is flexibly supported by the plurality of elastic support members, and the center of the ball of the groove (221) is on the axis of the detection rod (12) when the plurality of elastic support members are in the natural stretching state.

2. The fiber optic vibration measuring device based on Moiré fringes according to claim 1, characterized in that: A plurality of limiting blocks (211) are arranged on the edge of the support ring (21) on the side facing away from the grating sensor main body (11). The plurality of limiting blocks (211) are evenly distributed along the circumferential direction of the support ring (21). The push block (22) is arranged between the plurality of limiting blocks (211), and a gap is left between the push block (22) and the limiting blocks (211); A pressing plate (212) is connected to each of the plurality of limiting blocks (211), and the side surface of the pressing plate (212) facing the grating sensor main body (11) is attached to the side surface of the push block (22) facing away from the grating sensor main body (11).

3. The fiber optic vibration measuring device based on Moiré fringes according to claim 2, characterized in that: The pressing plate (212) is in the shape of an arc plate and is coaxial with the support ring (21). The push block (22) is in the shape of a stepped shaft, and the diameter value of the inner circular surface of the pressing plate (212) is smaller than the diameter value of the outer circular surface of the end of the push block (22) facing the grating sensor main body (11).

4. The fiber optic vibration measuring device based on Moiré fringes according to claim 2, characterized in that: A first threaded hole (2111) is formed on the side surface of each of the plurality of limiting blocks (211) facing away from the grating sensor main body (11). A through hole (2121) is formed on each of the plurality of pressing plates (212), and a fastening bolt (213) is arranged in the through hole (2121); The threaded end of the fastening bolt (213) is sequentially inserted into the through hole (2121) and the corresponding first threaded hole (2111), and is in threaded fit connection with the first threaded hole (2111).

5. The fiber optic vibration measuring device based on Moiré fringes according to claim 2, characterized in that: The elastic support member is a first spring (23). A limiting groove (2112) for installing the corresponding first spring (23) is formed in the middle of the inner side surface of each of the plurality of limiting blocks (211); The first spring (23) is embedded in the limiting groove (2112), and one end thereof is fixedly connected to the surface of the limiting groove (2112) facing away from the push block (22). When the plurality of first springs (23) are in the natural stretching state, the ends facing away from the corresponding limiting grooves (2112) all extend out of the limiting grooves (2112) and abut against the outer side surface of the push block (22).

6. The fiber optic vibration measuring device based on Moiré fringes according to claim 1, characterized in that: A coaxial sleeve (24) is arranged on the side of the support ring (21) facing the grating sensor main body (11). One end of the sleeve (24) is connected to the grating sensor main body (11), and the other end is provided with a plurality of support rods (241); A plurality of the support rods (241) are evenly distributed along the circumferential direction of the sleeve (24), and one end of the support rod (241) is fixedly connected to the sleeve (24), and the other end penetrates through the support ring (21) and is in sliding fit.

7. The fiber optic vibration measuring device based on Moiré fringes according to claim 6, characterized in that: A second spring (242) is sleeved outside the support rod (241), one end of the second spring (242) is fixedly connected to the support rod (241), and the other end is fixedly connected to the support ring (21).

8. The fiber optic vibration measurement device based on Moiré fringes according to claim 6, characterized in that: A connector (111) is provided on the grating sensor body (11), an external thread is provided on the outer side surface of the connector (111), and the sleeve (24) is sleeved outside the connector (111) and is connected by thread fit.

9. The fiber optic vibration measurement device based on Moiré fringes according to claim 8, wherein: A chute (243) extending radially is provided on the inner side wall of the sleeve (24), and a slider (244) is in sliding fit in the chute (243); A second threaded hole (2431) is provided on the plane of the chute (243) facing away from the opening, a lead screw (245) is connected in the second threaded hole (2431) by thread fit, and one end of the lead screw (245) is inserted into the slider (244) and is in rotational fit, and the other end extends out of the sleeve (24).

10. The fiber optic vibration measuring device based on Moiré fringes according to claim 1, characterized in that: One end of the push block (22) facing away from the grating sensor body (11) is fixedly connected to a magnetic base (13).

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