CN115598785A - Pre-stretching device - Google Patents
Pre-stretching device Download PDFInfo
- Publication number
- CN115598785A CN115598785A CN202110767761.XA CN202110767761A CN115598785A CN 115598785 A CN115598785 A CN 115598785A CN 202110767761 A CN202110767761 A CN 202110767761A CN 115598785 A CN115598785 A CN 115598785A
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- force application
- clamping
- application rod
- fixing base
- axial direction
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- 239000000758 substrate Substances 0.000 claims abstract description 18
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 230000000994 depressogenic effect Effects 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 description 28
- 239000000835 fiber Substances 0.000 description 26
- 238000002474 experimental method Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Clamps And Clips (AREA)
Abstract
The invention provides a pre-stretching device, which comprises a substrate; and two clamping components which are oppositely arranged on the substrate; the two clamping components are assembled on the substrate through the first fixing base and the second fixing base respectively; the clamping assembly comprises a housing having a receiving cavity; at least two clamping sheets which are arranged side by side and positioned in the shell; and a force application rod fixedly combined with one clamping sheet; the force application rod is configured to be movable in an axial direction of the force application rod; the force application rod of one clamping assembly comprises a first extension part which extends to the outer side of the first fixing base along the axial direction of the force application rod; the first extension part comprises a first tensioning piece; the first tensioning piece is abutted with the outer side surface of the first fixing base; the force application rod of the other clamping assembly is fixedly connected with the second fixing base; the two ends of the shell along the axial direction of the force application rod are open; the clamping assembly further comprises a pressing piece which is positioned on the shell and used for pressing and fixing the clamping pieces.
Description
Technical Field
The invention relates to the technical field of optical fiber Bragg gratings. And more particularly to a pretensioning apparatus.
Background
The fiber Bragg grating has wide application prospect in the sensing field of large scientific devices due to the advantages of distributed sensing, high precision, good long-term stability, electromagnetic interference resistance, capability of being used for measurement under extreme conditions, capability of transmitting optical signals along a bent path and the like. However, compared to conventional sensors, fiber Bragg grating sensors are more costly and therefore a reliable way of operation is of paramount importance.
The fiber Bragg grating is mainly sensitive to temperature and strain, and for measuring strain variation, the fiber Bragg grating can only sense the influence of an axial stress field on the effective refractive index and the period of the grating. Therefore, the bending of the grating section directly affects the measurement accuracy, and how to keep the grating section of the fiber Bragg grating in a straightened state is very important. When the fiber Bragg grating is applied to measurement in a low-temperature environment, certain prestress needs to be provided to ensure that the fiber Bragg grating measured in the low temperature is also in a stretching state.
Disclosure of Invention
In view of the above problems, the present invention provides a pre-tensioning device that keeps the fiber Bragg grating in a straightened state during the experiment and provides pre-stress to the fiber Bragg grating as needed for the experiment.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a pretensioning apparatus comprising: a substrate; and
two clamping components oppositely arranged on the substrate;
the two clamping components are assembled on the substrate through a first fixing base and a second fixing base respectively; the first fixing base comprises a first through hole; the second fixing base comprises a second through hole;
the clamping assembly includes a housing having a receiving cavity;
at least two clamping pieces which are arranged side by side and are positioned in the shell; and
the force application rod is fixedly combined with one clamping piece;
the force application rod is configured to be movable in an axial direction of the force application rod;
the force application rods of the two clamping assemblies respectively penetrate through the first through hole and the second through hole;
the force application rod of one clamping assembly comprises a first extension part which extends to the outer side of the first fixing base along the axial direction of the force application rod; the first extension part comprises a first tensioning piece; the first tensioning piece is abutted with the outer side surface of the first fixing base;
the force application rod of the other clamping assembly is fixedly connected with the second fixing base;
the two ends of the shell along the axial direction of the force application rod are open;
the clamping assembly also comprises a pressing piece which is positioned on the shell and used for pressing and fixing the clamping pieces; one end of the pressing piece penetrates through the shell to correspond to the clamping piece, and the other end of the pressing piece is exposed outside the shell.
In addition, it is preferable that the force application rod connected with the second fixing base includes a second extension portion extending to an outer side of the second fixing base along an axial direction of the force application rod; the second extending part comprises a second tensioning part; the second tensioning member abuts against an outer side surface of the second fixed base.
In addition, it is preferable that an end of the force application rod connected with the second fixing base, which end faces away from the clamping piece, comprises a convex ring structure; a spring is sleeved on the force application rod connected with the second fixed base; one end of the spring is abutted with the outer side surface of the second fixed base, and the other end of the spring is abutted with the convex ring structure.
In addition, preferably, the first fixing base comprises a first groove formed by inwards sinking the surface of the top wall of the first fixing base; in the axial direction of the force application rod, two ends of the first groove penetrate through two opposite side wall surfaces of the first fixed base;
the second fixing base comprises a second groove formed by inwards sinking the surface of the top wall of the second fixing base; in the axial direction of the force application rod, two ends of the second groove penetrate through two opposite side wall surfaces of the second fixing base, and the first groove and the second groove are coaxially arranged.
In addition, preferably, the substrate and the clamping assembly are made of stainless steel.
In addition, preferably, the housing includes a first screw hole and a fastening bolt disposed in the first screw hole; the fastening bolt is configured to abut against one of the clamping sheets and press and fix the clamping sheets when the fastening bolt is tightened; the fastening bolt forms the hold-down member.
In addition, it is preferable that the housing includes a receiving groove formed by a bottom wall thereof being inwardly depressed; the accommodating groove penetrates through two opposite side wall surfaces of the shell in the axial direction of the force application rod; the clamping piece is located in the accommodating groove.
Furthermore, it is preferable that the receiving groove has a rectangular cross section.
Furthermore, it is preferable that the housing has an arch structure.
The invention has the beneficial effects that:
the optical fiber pre-tensioning device has the advantages that the clamping sheets are matched with the pressing piece, the optical fiber can be clamped and fixed, after the clamping sheets are pressed and fixed, the clamping sheets and the shell are driven by the force application rod to move along the axial direction of the clamping sheets and the shell, and the optical fiber is pre-tensioned.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of the structure of the clamping assembly of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.
In order to keep the fiber Bragg grating in a straightened state during the experiment and to provide prestress to the fiber Bragg grating when required by the experiment. The invention provides a pretensioning apparatus, which, as shown in fig. 1 and 2, specifically comprises: a substrate 1; and two clamping assemblies 2 oppositely arranged on the substrate 1; the two clamping components 2 are respectively assembled on the substrate 1 through a first fixed base 3 and a second fixed base 4; the first fixing base 3 comprises a first through hole; the second fixing base 4 comprises a second through hole; the clamping assembly 2 comprises a housing 5 having a receiving cavity; at least two clamping sheets 6 arranged side by side in the shell 5; and a force application rod 7 fixedly combined with one clamping piece 6; the force application rod 7 is configured to be movable in the axial direction of the force application rod 7; the force application rods 7 of the two clamping components 2 respectively penetrate through the first through hole and the second through hole; the force application rod 7 of one clamping assembly 2 comprises a first extension part 8 which extends to the outer side of the first fixed base along the axial direction of the force application rod 7; the first extension part 8 comprises a first tensioning member 9; the first tensioning member 9 abuts against the outer side surface of the first fixing base 3; the force application rod 7 of the other clamping assembly 2 is fixedly connected with the second fixed base 4; the two ends of the shell 5 along the axial direction of the force application rod 7 are open; the clamping assembly 2 further comprises a pressing piece which is positioned on the shell 5 and used for pressing and fixing the clamping pieces 6; one end of the pressing piece penetrates through the shell 5 to correspond to the clamping piece 6, and the other end of the pressing piece is exposed out of the shell 5. The invention provides a pre-stretching device which can be used for pre-stretching an optical fiber Bragg grating, wherein at least two clamping pieces 6 are arranged to clamp the optical fiber Bragg grating, a tensioning member is screwed to enable a force application rod 7 to drive the clamping pieces 6 which clamp and fix the optical fiber Bragg grating to move so as to adjust the magnitude of the pre-stretching force of the pre-stretching device on the optical fiber Bragg grating, and the pre-stretching device is suitable for pre-stretching optical fiber Bragg gratings of different models. The pre-stretching device can keep the optical fiber Bragg grating in a straightening state in the experiment process, can provide certain pre-stress under the condition of experiment needs, provides a reliable experiment operation platform, and solves the problem of raw material waste caused by breakage of the optical fiber Bragg grating.
It can be understood that the tensioning piece can be the nut of spiro union on 7 tip of application of force pole, after clamping piece 6 is compressed tightly in casing 5, application of force pole 7 can drive casing 5 and remove along the axis direction of application of force pole 7, first fixed baseplate 3 and second fixed baseplate 4 set up relatively, two centre gripping subassemblies 2 of relative disposition on base plate 1 are a set of, can assemble the above-mentioned centre gripping subassembly 2 of multiunit on base plate 1, prestretch many optic fibre simultaneously, improve work efficiency, save operating time, specifically, can dispose five groups of centre gripping subassemblies 2 side by side through the fixed baseplate 1.
Two clamping elements 2 are arranged on the substrate 1 for determining the extension of the grating segments of the fiber Bragg grating in a plane parallel to the plane of the substrate 1. The first fixing base 3 and the second fixing base 4 are fixed to the substrate 1 by bolts.
In a specific embodiment, the force application rod connected with the second fixed base comprises a second extension part extending to the outer side of the second fixed base along the axial direction of the force application rod; the second extending part comprises a second tensioning part; the second tensioning member abuts against an outer side surface of the second fixed base. In this embodiment, two clamping components 2 are connected with the fixed base through the tensioning piece and are matched with each other, and can provide corresponding pretightening force for the optical fiber Bragg grating through adjusting the first tensioning piece 9 and the second tensioning piece respectively when needed. It will be appreciated that when both the first tensioning member 9 and the second tensioning member are nuts, both the first 8 and the second stretch are provided with a thread and the outer diameter of the nuts is larger than the diameter of the first and second through holes.
The matching mode of the tensioning piece and the force application rod 7 can be that the tensioning piece is a tension bolt, and the extension part of the force application rod 7 comprises a second screw hole which is arranged along the axial direction of the force application rod 7; a tension bolt is screwed in the second screw hole; the tension bolt is positioned on one side of the fixed base, which is far away from the shell 5; a sleeve is sleeved on the extension part of the force application rod 7; one end of the sleeve is fixed with the fixed base, the other end of the sleeve is abutted against the head of the tension bolt, and the sleeve is used as a support of the tension bolt and provides an acting point for the tension bolt; when screwing the tension bolt, the force application rod 7 can be moved in the axial direction of the force application rod 7. The tension bolt is positioned on one side of the fixed base, which is far away from the shell 5; the diameter of the head of the tension bolt is larger than the inner diameter of the sleeve. It will be appreciated that the second threaded hole functions to threadedly engage the tension bolt with the force application rod 7. The tension bolt is provided with the inner hexagonal hole, the tension bolt can be screwed to move and position the clamping component 2, pre-tensioning on the optical fiber is achieved, when the clamping component 2 clamps the optical fiber Bragg grating, one of the two clamping components 2 can be fixed, the clamping component 2 can be moved by screwing the tension bolt on the other clamping component 2, and pre-tensioning force is provided for the optical fiber. The grating section of the optical fiber Bragg grating needing to be pre-stretched is placed between the two clamping components 2, and the optical fiber Bragg grating can be pre-stretched by rotating the tension bolt.
In another specific embodiment, the end of the force application rod 7 connected with the second fixed base 4 facing away from the clamping piece 6 comprises a convex ring structure 13; a spring 14 is sleeved on the force application rod 7 connected with the second fixed base 4; one end of the spring 14 abuts against the outer side surface of the second fixed base 4, and the other end abuts against the projected ring structure 13. Through the arrangement, the optical fiber Bragg grating and the clamping component 2 can be prevented from being loosened due to the fact that the expansion amount or the contraction amount of the optical fiber Bragg grating is not matched in expansion with heat and contraction with cold.
In a specific embodiment, the first fixing base 3 includes a first groove 15 formed by inwardly recessing a top wall surface thereof; in the axial direction of the force application rod 7, two ends of the first groove 15 penetrate through two opposite side wall surfaces of the first fixed base 3; the second fixed base 4 comprises a second groove 16 formed by inwards recessing the surface of the top wall of the second fixed base; in the axial direction of the force application rod 7, two ends of the second groove 16 penetrate through two opposite side wall surfaces of the second fixed base 4, and the first groove 15 and the second groove 16 are coaxially arranged. The fiber Bragg grating fixing device has the advantages that a channel is reserved for the fiber Bragg grating to pass through, the fiber Bragg grating can penetrate out of the two ends of the first fixing base 3 and the second fixing base 4 through the first groove 15 and the second groove 16, and the fiber Bragg grating can be arranged in parallel to the horizontal plane.
In one embodiment, the substrate 1 and the clamping assembly 2 are made of stainless steel. The stainless steel has good corrosion resistance, and the substrate 1 and the clamping component 2 made of the stainless steel have stable chemical properties and good physical properties, such as high temperature resistance and low temperature resistance, and can be applied to various complex working environments.
In order to fix each clamping piece 6 and enable the clamping pieces 6 to clamp the fiber bragg grating, the shell 5 comprises a first screw hole and a fastening bolt 17 arranged in the first screw hole; the fastening bolt 17 is configured such that when the fastening bolt 17 is tightened, the end of the fastening bolt 17 located in the housing 5 abuts against one of the clamping pieces 6 and presses and fixes the clamping pieces 6 to each other; the fastening bolt 17 forms the pressing piece. With the above arrangement, the fastening bolt 17 can stably fix the holding pieces 6 in the housing 5, so that the optical fiber between the two holding pieces 6 can be stably held.
In an alternative embodiment, the housing 5 includes a receiving groove formed by the bottom wall thereof being recessed inward; the receiving grooves penetrate through the two opposite side wall surfaces of the housing 5 in the axial direction of the force application rod 7; the clamping piece 6 is located in the accommodating groove, and the accommodating groove is used for accommodating the clamping piece 6.
Specifically, the cross section of the accommodating groove is rectangular. The clamping piece has the advantages that as the section of the clamping piece 6 is rectangular, the accommodating groove with the rectangular section can be better matched with the clamping piece 6; the contact area between the clamping piece 6 and the shell 5 is large after being compressed, the friction force between the clamping piece and the shell is increased, and the situation that the clamping piece 6 is separated from the shell 5 after being compressed is prevented, so that the normal operation of the follow-up operation is influenced.
In addition, in an embodiment, the housing 5 is an arch structure, the bottom surface of the housing 5 is a plane, which can perform a rotation limiting function, and the arch structure is stressed more uniformly, so that the housing 5 is more stable. The arched shell 5 facilitates assembly; in addition, the raw material cost is saved. The shell 5 is used for carrying out primary fixing on the clamping piece 6; the fastening bolt 17 is used for carrying out secondary compression fixing on the clamping pieces 6 and preventing the optical fiber Bragg grating from sliding between the clamping pieces 6.
In a specific implementation process, the fiber Bragg grating needing to be pre-tensioned is clamped between two clamping pieces 6, a grating section of the fiber Bragg grating is arranged in the middle of the pre-tensioning device, namely between the two clamping components 2, an adhesive tape is adhered to the position, needing to be clamped by the clamping pieces 6, of the optical fiber, the part, adhered with the adhesive tape, of the optical fiber is arranged between the two clamping pieces 6, two ends of the fiber Bragg grating are horizontally arranged and extend out of the first groove 15 and the second groove 16 respectively, the clamping pieces 6 clamp the fiber Bragg grating by tightening the fastening bolts 17, the nut on one clamping component 2 of the two clamping components 2 is screwed to fix the position of the fiber Bragg grating and keep the fiber Bragg grating fixed after screwing, the nut on the other clamping component 2 is screwed to enable the clamping component 2 to move outwards, pre-tensioning of the fiber Bragg grating is achieved, the magnitude of the pre-tensioning force can be controlled through the reading of an demodulator connected with the fiber Bragg grating, and the larger displacement wavelength indicates that the pre-tensioning force is larger.
In summary, the optical fiber is clamped and fixed by matching the clamping sheets and the pressing piece, after the clamping sheets are pressed and fixed, the clamping sheets and the shell are driven by the force applying rod to move along the axial direction of the clamping sheets and the shell, so that the optical fiber is pre-tensioned, and the pre-tensioning device is simple in structure, convenient to operate, high in compatibility, suitable for stretching optical fibers with different diameters, capable of keeping the optical fiber Bragg grating in a straight state in the experimental process and capable of providing prestress for the optical fiber Bragg grating when required by the experiment.
It should be understood that the above-described embodiments of the present invention are examples for clearly illustrating the invention, and are not to be construed as limiting the embodiments of the present invention, and it will be obvious to those skilled in the art that various changes and modifications can be made on the basis of the above description, and it is not intended to exhaust all embodiments, and obvious changes and modifications can be made on the basis of the technical solutions of the present invention.
Claims (9)
1. A pretensioning apparatus, characterized in that it comprises:
a substrate; and
two clamping components which are oppositely arranged on the substrate;
the two clamping components are assembled on the substrate through a first fixing base and a second fixing base respectively; the first fixing base comprises a first through hole; the second fixing base comprises a second through hole;
the clamping assembly includes a housing having a receiving cavity;
at least two clamping sheets which are arranged side by side and positioned in the shell; and
the force application rod is fixedly combined with one clamping sheet;
the force application rod is configured to be movable in an axial direction of the force application rod;
the force application rods of the two clamping assemblies respectively penetrate through the first through hole and the second through hole;
the force application rod of one clamping assembly comprises a first extension part which extends to the outer side of the first fixing base along the axial direction of the force application rod; the first extension part comprises a first tensioning piece; the first tensioning piece is abutted with the outer side surface of the first fixing base;
the force application rod of the other clamping assembly is fixedly connected with the second fixing base;
the two ends of the shell along the axial direction of the force application rod are open;
the clamping assembly also comprises a pressing piece which is positioned on the shell and used for pressing and fixing the clamping pieces; one end of the pressing piece penetrates through the shell to correspond to the clamping piece, and the other end of the pressing piece is exposed outside the shell.
2. A pretensioning apparatus as claimed in claim 1, characterized in that the force application rod connected to the second fixing base comprises a second extension which extends to the outside of the second fixing base in the axial direction of the force application rod; the second extending part comprises a second tensioning part; the second tensioning member abuts against an outer side surface of the second fixed base.
3. A pretensioning apparatus as claimed in claim 1, characterized in that the end of the force application rod connected to the second fixing base facing away from the clamping tabs comprises a collar structure; a spring is sleeved on the force application rod connected with the second fixed base; one end of the spring is abutted with the outer side surface of the second fixed base, and the other end of the spring is abutted with the convex ring structure.
4. The pretensioning apparatus according to claim 1, wherein the first fixing base includes a first groove formed by an inwardly depressed top wall surface thereof; in the axial direction of the force application rod, two ends of the first groove penetrate through two opposite side wall surfaces of the first fixed base;
the second fixing base comprises a second groove formed by inwards recessing the surface of the top wall of the second fixing base; in the axial direction of the force application rod, two ends of the second groove penetrate through two opposite side wall surfaces of the second fixing base, and the first groove and the second groove are coaxially arranged.
5. A pretensioning apparatus as defined in claim 1, wherein the base plate and the clamping elements are made of stainless steel.
6. The pretensioning apparatus according to claim 1, wherein the housing includes a first threaded bore and a fastening bolt disposed in the first threaded bore; the fastening bolt is configured to abut against one of the clamping sheets and press and fix the clamping sheets when the fastening bolt is tightened; the fastening bolt forms the hold-down member.
7. A pre-tensioning device according to claim 1, characterized in that the housing includes a receiving groove formed by a bottom wall thereof being depressed inwardly; the accommodating groove penetrates through two opposite side wall surfaces of the shell in the axial direction of the force application rod; the clamping piece is located in the accommodating groove.
8. A pretensioning apparatus in accordance with claim 7, characterized in that the receiving groove is rectangular in cross-section.
9. A pretensioning apparatus as recited in claim 1, wherein the housing is of an arcuate configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110767761.XA CN115598785A (en) | 2021-07-07 | 2021-07-07 | Pre-stretching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110767761.XA CN115598785A (en) | 2021-07-07 | 2021-07-07 | Pre-stretching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115598785A true CN115598785A (en) | 2023-01-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110767761.XA Pending CN115598785A (en) | 2021-07-07 | 2021-07-07 | Pre-stretching device |
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| Country | Link |
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| CN (1) | CN115598785A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117310868A (en) * | 2023-09-26 | 2023-12-29 | 浙江贝良风能电子科技有限公司 | Fiber bragg grating stretching equipment and application method thereof |
-
2021
- 2021-07-07 CN CN202110767761.XA patent/CN115598785A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117310868A (en) * | 2023-09-26 | 2023-12-29 | 浙江贝良风能电子科技有限公司 | Fiber bragg grating stretching equipment and application method thereof |
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