Gear type fiber bragg grating wide-range displacement measuring device

Abstract

The utility model provides a gear type fiber bragg grating wide-range displacement measuring device. The gear type fiber bragg grating wide-range displacement measuring device comprises a displacement transmission module and a displacement measuring module, the displacement transmission module comprises a main body, a displacement detection assembly and a displacement transmission assembly; the displacement transmission assembly is used for converting the translation motion of the translation assembly into rotation motion and causing deformation of the displacement detection assembly, and the displacement detection assembly measures the relative displacement between the first measured object and the second measured object. The gear type fiber bragg grating wide-range displacement measuring device provided by the utility model does not need a complex structure, is simple and reliable, reduces construction difficulty and failure rate, and is low in cost and high in cost performance; the displacement measurement module and the displacement transmission module adopt a direct coupling mode, so that the gear type fiber bragg grating wide-range displacement measurement device has good dynamic measurement capability, and the measurement precision can be improved; and the transverse wide-range displacement value of the shock insulation support can be effectively measured.

Description

Technical Field

[0001] The utility model belongs to the technical field of displacement measurement, and in particular relates to a gear-type optical fiber Bragg grating large-range displacement measurement device. Background Art

[0002] Seismic isolation measures can ensure the safety of building structures and are an effective earthquake-resistant method. Seismic isolation bearings are key components in seismic isolation systems, and monitoring the displacement of seismic isolation bearings has become a focus. At present, the method for monitoring the displacement of seismic isolation bearings is to stick the fiber grating on the elastic beam, match it with a displacement transmission mechanism similar to a wedge-shaped slider, convert the displacement into the strain of the grating through the deformation of the beam, and measure the displacement by demodulating the reflection wavelength of the grating. This sensor monitoring method has problems such as insufficient lateral measurement range and susceptibility to environmental influences. Utility Model Content

[0003] In view of the defects in the prior art, the utility model provides a gear-type fiber Bragg grating large-range displacement measuring device, which can effectively solve the above problems.

[0004] The technical solution adopted by the utility model is as follows:

[0005] The utility model provides a gear-type fiber Bragg grating large-range displacement measuring device, comprising a displacement transmission module (1) and a displacement measurement module (2);

[0006] The displacement measurement module (2) comprises a rack sleeve (21) and a translation assembly (22); the translation assembly (22) is built into the rack sleeve (21) and is capable of translational movement relative to the rack sleeve (21) along the length direction of the rack sleeve (21); one end of the translation assembly (22) is used for fixed connection with a first object to be measured;

[0007] The displacement transmission module (1) comprises a main body (11), a displacement detection component (12) and a displacement transmission component (13); the main body (11) is used for being fixedly connected to a second object to be measured; the main body (11) is connected and fixed to the rack sleeve (21); the displacement detection component (12) and the displacement transmission component (13) are arranged inside the main body (11), and one end of the displacement transmission component (13) is meshed with the translation component (22), and the other end is connected to the displacement detection component (12); the displacement transmission component (13) is used for converting the translation motion of the translation component (22) into rotation motion, and causing deformation of the displacement detection component (12), so that the relative displacement between the first object to be measured and the second object to be measured is measured by the displacement detection component (12).

[0008] Preferably, the length direction of the rack sleeve (21) and the translation assembly (22) is the length direction of the displacement measurement module (2);

[0009] The rack sleeve (21) comprises a rack slide groove (211) and a slide groove bottom plate (212); the translation assembly (22) comprises a limit block (221), a rack belt (222) and a measuring guide rod (223); the limit block (221) is fixedly installed inside the rack slide groove (211); one end of the rack belt (222) along the length direction is built into the rack slide groove (211) and can slide along the length direction relative to the rack slide groove (211); the measuring guide rod (223) is fixedly installed at the other end of the rack belt (222) along the length direction; one end of the measuring guide rod (223) is used for fixed connection with the first measured object.

[0010] Preferably, the main body (11) comprises a top plate (111), an outer shell (112) and a base plate (113); the top plate (111) is fixedly mounted on one end of the outer shell (112); the base plate (113) is fixedly mounted inside the outer shell (112); the outer shell (112) is provided with a rack fixing hole (1121) opened along the length direction of the main body (11); and the translation assembly (22) slides through the rack fixing hole (1121).

[0011] Preferably, the displacement transmission assembly (13) comprises a traction wire (131), a rotating shaft (132), a gear (133) and a rotating bearing (134);

[0012] The rotating bearings (134) are respectively installed at both ends of the rotating shaft (132), and the rotating shaft (132) can rotate freely inside the main body (11) through the two rotating bearings (134); the center of the gear (133) is sleeved on the outer periphery of the rotating shaft (132) and is fixed to the rotating shaft (132), and at the same time, the gear (133) is meshed with the rack belt (222) of the translation assembly (22); when the rack belt (222) moves in translation, it drives the gear (133) to rotate; when the gear (133) rotates, it drives the rotating shaft (132) to rotate synchronously; one end of the traction wire (131) is fixed to the rotating shaft (132).

[0013] Preferably, one end of the traction wire (131) is connected to a small hole on the winding section (1321) of the rotating shaft (132); and the gear (133) is fixed to the outer periphery of the rotating shaft (132) through a keyway fixing section (1322).

[0014] Preferably, the displacement detection component (12) comprises an equal-strength straight beam (121) and a fiber Bragg grating (122); the equal-strength straight beam (121) comprises a fixed end (1211), a free end (1213), and a measuring section (1212) connecting the fixed end (1211) and the free end (1213); the fixed end (1211) is fixedly connected to the main body (11); the measuring section (1212) is parallel to the sliding direction of the translation component (22), and the fiber Bragg grating (122) is fixedly mounted on the upper and lower surfaces of the measuring section (1212); the free end (1213) is fixedly connected to the other end of the traction wire (131) and is perpendicular to the traction wire (131).

[0015] Preferably, the fixed end (1211) is fixedly connected to the main body (11) via a cantilever beam connector (14); and the free end (1213) is fixedly connected to the other end of the traction wire (131) via a wire hole (1216).

[0016] Preferably, a through hole (1214) is opened on the surface of the measuring section (1212) to form a straight beam (1215); and the fiber grating (122) is attached and fixed to the upper and lower surfaces of the straight beam (1215).

[0017] The utility model provides a gear-type fiber Bragg grating large-range displacement measuring device with the following advantages:

[0018] The gear-type fiber Bragg grating large-range displacement measuring device provided by the utility model does not require a complex structure, is simple and reliable, reduces construction difficulty and failure rate, has low cost and high cost performance; and the displacement measurement module and the displacement transmission module adopt a direct coupling method, so that the gear-type fiber Bragg grating large-range displacement measuring device has good dynamic measurement capabilities, which is conducive to improving measurement accuracy. The gear-type fiber Bragg grating large-range displacement measuring device of the utility model can effectively measure the lateral large-range displacement value of the seismic isolation support, and solves the defects of the displacement sensor in the prior art in monitoring the displacement of the seismic isolation support, such as insufficient range, high construction difficulty, complex system and high failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a gear-type fiber Bragg grating large-range displacement measuring device provided by the utility model;

[0020] Figure 2 A schematic diagram of the decomposed structure of the displacement measurement module provided by the utility model;

[0021] Figure 3 A schematic diagram of a partially exploded structure of a displacement transfer module provided by the utility model;

[0022] Figure 4 A schematic diagram of the side planing of the displacement transfer module provided by the utility model;

[0023] Figure 5 This is a structural schematic diagram of the cantilever beam provided by the utility model.

[0024] In the figure:

[0025] 1-displacement transmission module; 2-displacement measurement module;

[0026] 11-main body; 12-displacement detection assembly; 13-displacement transmission assembly; 14-cantilever beam connector; 21-rack sleeve; 22-translation assembly;

[0027] 111-top plate; 112-housing; 113-base plate; 121-uniform strength beam; 122-fiber grating; 131-traction wire; 132-rotating shaft; 133-gear; 134-rotating bearing; 211-rack slideway; 212-slideway bottom plate; 221-limiting block; 222-rack belt; 223-measuring guide rod;

[0028] 1121- rack fixing hole; 1211- fixed end; 1212- measuring section; 1213- free end; 1214- through hole; 1215- straight beam; 1216- wire hole; 1321- winding section; 1322- keyway fixing section; 1341- bearing base Ⅰ; 1342- bearing Ⅰ; 1343- bearing base Ⅱ; 1344- bearing Ⅱ;

[0029] 100-gear type fiber Bragg grating large range displacement measurement device. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0031] The utility model provides a gear-type fiber Bragg grating large-range displacement measuring device, which is used to solve the problems of insufficient lateral measurement range and susceptibility to environmental influence when using electrical displacement sensors to monitor the displacement of seismic isolation supports in the prior art. The utility model is a gear-type fiber Bragg grating displacement measuring device that measures lateral large-range displacement without sacrificing sensitivity as much as possible.

[0032] See also Figure 1 to Figure 5In the utility model, a gear-type fiber Bragg grating large-range displacement measuring device includes a displacement measuring module 2 and a displacement transmission module 1; one end of the displacement measuring module 2 in the length direction is used to connect to a first object to be measured, the displacement transmission module 1 is connected between the two ends of the displacement measuring module 2 in the length direction, and the displacement transmission module 1 is used to connect to a second object to be measured; when the first object to be measured and the second object to be measured have a relative displacement along the length direction of the displacement measuring module 2, the relative displacement is transmitted to the displacement detection component 12 inside the displacement transmission module 1.

[0033] The displacement measurement module 2 and the displacement transmission module 1 are described in detail below:

[0034] (I) Displacement measurement module 2

[0035] The displacement measurement module 2 includes a rack sleeve 21 and a translation assembly 22. The length direction of the rack sleeve 21 and the translation assembly 22 is the length direction of the displacement measurement module 2.

[0036] One end of the rack sleeve 21 in the length direction is connected to the displacement transmission module 1; the rack sleeve 21 includes a rack slide groove 211 and a slide groove bottom plate 212;

[0037] The translation assembly 22 is built into the rack sleeve 21, and can translate relative to the rack sleeve 21 along the length direction of the rack sleeve 21; one end of the translation assembly 22 is used to be fixedly connected to the first object to be measured; specifically, the translation assembly 22 includes a limit block 221, a rack belt 222 and a measuring guide rod 223; the limit block 221 is fixedly installed inside the rack slide groove 211; one end of the rack belt 222 along the length direction is built into the rack slide groove 211, and can slide along the length direction relative to the rack slide groove 211; the other end of the rack belt 222 along the length direction is fixedly installed with the measuring guide rod 223; one end of the measuring guide rod 223 is used to be fixedly connected to the first object to be measured.

[0038] (II) Displacement transfer module 1

[0039] The displacement transmission module 1 includes a main body 11, a displacement detection component 12 and a displacement transmission component 13;

[0040] (2.1) Main body 11

[0041] The main body 11 is used to be fixedly connected to the second object to be measured; the length direction of the main body 11 is the length direction of the displacement measurement module 2, and the main body 11 is connected and fixed to the rack sleeve 21; the main body 11 includes a top plate 111, an outer shell 112 and a base plate 113; the top plate 111, the outer shell 112 and the base plate 113 are spliced ​​and fixed; specifically, the top plate 111 is fixedly installed at one end of the outer shell 112; the base plate 113 is fixedly installed inside the outer shell 112; the outer shell 112 is provided with a rack fixing hole 1121 opened along the length direction of the main body 11; the translation assembly 22 slides through the rack fixing hole 1121.

[0042] (2.2) Displacement transmission component 13

[0043] A displacement detection component 12 and a displacement transmission component 13 are arranged inside the main body 11, and one end of the displacement transmission component 13 is engaged with the translation component 22, and the other end is connected to the displacement detection component 12; the displacement transmission component 13 is used to convert the translation motion of the translation component 22 into rotation motion, and cause the deformation of the displacement detection component 12, and the relative displacement between the first object to be measured and the second object to be measured is measured by the displacement detection component 12.

[0044] The displacement transmission assembly 13 includes a traction wire 131, a rotating shaft 132, a gear 133 and a rotating bearing 134;

[0045] A rotating bearing 134 is installed at each end of the rotating shaft 132, and the rotating shaft 132 can rotate freely inside the main body 11 through the two rotating bearings 134; for example, the two rotating bearings 134 include a bearing base Ⅰ1341, a bearing Ⅰ1342, a bearing Ⅰ1342, a bearing base Ⅱ1343 and a bearing Ⅱ1344; the bearing Ⅰ1342 and the bearing Ⅱ1344 are respectively embedded in the bearing base Ⅰ1341 and the bearing base Ⅱ1343, and the bearing base Ⅰ1341 and the bearing base Ⅱ1343 are respectively fixed to the inner side of the top plate 111 and the base plate 112, and the two ends of the rotating shaft 132 are arranged inside the main body 11 through the rotating bearings 134, so that the rotating shaft 132 can rotate freely inside the main body 11;

[0046] The center of the gear 133 is sleeved on the outer periphery of the rotating shaft 132 and is fixed to the rotating shaft 132. For example, the gear 133 is fixed to the outer periphery of the rotating shaft 132 through the keyway fixing section 1322. At the same time, the gear 133 is meshed with the rack belt 222 of the translation assembly 22. When the rack belt 222 moves translationally, the gear 133 is driven to rotate. When the gear 133 rotates, the rotating shaft 132 is driven to rotate synchronously. One end of the traction wire 131 is fixed to the rotating shaft 132. For example, one end of the traction wire 131 is connected to the small hole on the winding section 1321 of the rotating shaft 132.

[0047] (2.3) Displacement detection component 12

[0048] The displacement detection component 12 includes an equal-strength straight beam 121 and a fiber grating 122;

[0049] The equal-strength straight beam 121 includes a fixed end 1211, a free end 1213, and a measuring section 1212 connecting the fixed end 1211 and the free end 1213; the fixed end 1211 is fixedly connected to the main body 11, for example, the fixed end 1211 is fixedly connected to the main body 11 through a cantilever beam connector 14; the measuring section 1212 is parallel to the sliding direction of the translation assembly 22, and the optical fiber Bragg grating 122 is fixedly installed on the upper and lower surfaces of the measuring section 1212, for example, a through hole 1214 is opened on the surface of the measuring section 1212 to form a straight beam 1215; the optical fiber Bragg grating 122 is attached and fixed to the upper and lower surfaces of the straight beam 1215; the free end 1213 is fixedly connected to the other end of the traction wire 131, and is perpendicular to the traction wire 131, for example, the free end 1213 is fixedly connected to the other end of the traction wire 131 through a wire hole 1216.

[0050] The working principle is:

[0051] During use, the main body 11 of the gear-type fiber Bragg grating large-range displacement measuring device 100 is fixed to the second object to be measured, and the measuring guide rod 223 is fixedly connected to the first object to be measured. When the two measured objects are relatively displaced, the measuring guide rod 223 drives the entire translation assembly 22 to slide along the length direction of the displacement measurement module 2. At this time, the rack belt 222 on the translation assembly 22 is meshed with the gear 133 in the displacement transmission assembly 13, driving the gear 133 to rotate, and the rotating shaft 132 coaxially fixed with the gear 133 rotates accordingly. At the same time, the traction wire 131 connecting the rotating shaft 132 and the equal-strength beam 121 contracts with the rotation of the rotating shaft 132, and the surface of the equal-strength beam 121 is deformed. The fiber grating 122 attached and fixed on the equal-strength beam 121 is deformed with the equal-strength beam, converting the external large displacement into a small deformation that can be directly detected. Finally, the relative displacement between the two measured objects can be obtained by demodulating the wavelength drift of the fiber grating 122, and the measurement effect of a large range of displacement is achieved at this time.

[0052] The utility model, the gear-type fiber Bragg grating large-range displacement measuring device does not require a complex structure, is simple and reliable, reduces the difficulty of construction and the failure rate, is low in cost, and has a high cost performance ratio; and the displacement measurement module and the displacement transmission module adopt a direct coupling method, so that the gear-type fiber Bragg grating large-range displacement measuring device has good dynamic measurement capabilities, which is conducive to improving the measurement accuracy. The utility model's gear-type fiber Bragg grating large-range displacement measuring device can effectively measure the lateral large-range displacement value of the isolation support, and solves the defects of the displacement sensor in the prior art in monitoring the displacement of the isolation support, such as insufficient range, high construction difficulty, complex system, and high failure rate.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A gear-type fiber Bragg grating large-range displacement measuring device, characterized in that: It comprises a displacement transmission module (1) and a displacement measurement module (2); The displacement measurement module (2) comprises a rack sleeve (21) and a translation assembly (22); the translation assembly (22) is built into the rack sleeve (21) and is capable of translational movement relative to the rack sleeve (21) along the length direction of the rack sleeve (21); one end of the translation assembly (22) is used for fixed connection with a first object to be measured; The displacement transmission module (1) comprises a main body (11), a displacement detection component (12) and a displacement transmission component (13); the main body (11) is used for being fixedly connected to a second object to be measured; the main body (11) is connected and fixed to the rack sleeve (21); the displacement detection component (12) and the displacement transmission component (13) are arranged inside the main body (11), and one end of the displacement transmission component (13) is meshed with the translation component (22), and the other end is connected to the displacement detection component (12); the displacement transmission component (13) is used for converting the translation motion of the translation component (22) into rotation motion, and causing deformation of the displacement detection component (12), so that the relative displacement between the first object to be measured and the second object to be measured is measured by the displacement detection component (12).

2. A gear-type fiber Bragg grating large-range displacement measuring device according to claim 1, characterized in that: The length direction of the rack sleeve (21) and the translation assembly (22) is the length direction of the displacement measurement module (2); The rack sleeve (21) comprises a rack slide groove (211) and a slide groove bottom plate (212); the translation assembly (22) comprises a limit block (221), a rack belt (222) and a measuring guide rod (223); the limit block (221) is fixedly installed inside the rack slide groove (211); one end of the rack belt (222) along the length direction is built into the rack slide groove (211) and can slide along the length direction relative to the rack slide groove (211); the measuring guide rod (223) is fixedly installed at the other end of the rack belt (222) along the length direction; one end of the measuring guide rod (223) is used for fixed connection with the first measured object.

3. A gear-type fiber Bragg grating large-range displacement measuring device according to claim 2, characterized in that: The main body (11) comprises a top plate (111), an outer shell (112) and a base plate (113); the top plate (111) is fixedly mounted on one end of the outer shell (112); the base plate (113) is fixedly mounted inside the outer shell (112); the outer shell (112) is provided with a rack fixing hole (1121) opened along the length direction of the main body (11); the translation assembly (22) slides through the rack fixing hole (1121).

4. A gear-type fiber Bragg grating large-range displacement measuring device according to claim 2, characterized in that: The displacement transmission assembly (13) comprises a traction wire (131), a rotating shaft (132), a gear (133) and a rotating bearing (134); The rotating bearings (134) are respectively installed at both ends of the rotating shaft (132), and the rotating shaft (132) can rotate freely inside the main body (11) through the two rotating bearings (134); the center of the gear (133) is sleeved on the outer periphery of the rotating shaft (132) and is fixed to the rotating shaft (132), and at the same time, the gear (133) is meshed with the rack belt (222) of the translation assembly (22); when the rack belt (222) moves in translation, it drives the gear (133) to rotate; when the gear (133) rotates, it drives the rotating shaft (132) to rotate synchronously; one end of the traction wire (131) is fixed to the rotating shaft (132).

5. A gear-type fiber Bragg grating large-range displacement measuring device according to claim 4, characterized in that: One end of the traction wire (131) is connected to a small hole on the winding section (1321) of the rotating shaft (132); the gear (133) is fixed to the outer periphery of the rotating shaft (132) through a keyway fixing section (1322).

6. A gear-type fiber Bragg grating large-range displacement measuring device according to claim 4, characterized in that: The displacement detection component (12) comprises an equal-strength straight beam (121) and a fiber Bragg grating (122); the equal-strength straight beam (121) comprises a fixed end (1211), a free end (1213), and a measuring section (1212) connecting the fixed end (1211) and the free end (1213); the fixed end (1211) is fixedly connected to the main body (11); the measuring section (1212) is parallel to the sliding direction of the translation component (22), and the fiber Bragg grating (122) is fixedly mounted on the upper and lower surfaces of the measuring section (1212); the free end (1213) is fixedly connected to the other end of the traction steel wire (131) and is perpendicular to the traction steel wire (131).

7. A gear-type fiber Bragg grating large-range displacement measuring device according to claim 6, characterized in that: The fixed end (1211) is fixedly connected to the main body (11) via a cantilever beam connector (14); and the free end (1213) is fixedly connected to the other end of the traction wire (131) via a wire hole (1216).

8. The gear-type fiber Bragg grating large-range displacement measuring device according to claim 6, characterized in that: The surface of the measuring section (1212) is provided with a through hole (1214) to form a straight beam (1215); the optical fiber grating (122) is attached and fixed to the upper and lower surfaces of the straight beam (1215).

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