CN115598785A - Pre-stretching device - Google Patents

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

A kind of pre-tensioning device

technical field

The invention relates to the technical field of fiber Bragg gratings. More specifically, it relates to a pre-tensioning device.

Background technique

Due to the advantages of distributed sensing, high precision, good long-term stability, anti-electromagnetic interference, can be used for measurement under extreme conditions, and can transmit optical signals along curved paths, fiber Bragg gratings (fiber Bragg gratings) are used in large scientific devices. The field of sensing has broad application prospects. But fiber Bragg grating sensors are costly compared to traditional sensors, so reliable operation is crucial.

The fiber Bragg grating is mainly sensitive to temperature and strain. In terms of measuring the strain variation, the fiber Bragg grating can only perceive the influence of the axial stress field on the effective refractive index and period of the grating. It can be seen that the bending of the grating segment will directly affect the measurement accuracy, and how to keep the grating segment of the fiber Bragg grating straight is very important. When the fiber Bragg grating is used for measurement in a low temperature environment, it is necessary to provide a certain prestress to ensure that the fiber Bragg grating measured in the low temperature is also in a stretched state.

Contents of the invention

In view of the above problems, the present invention provides a pre-tensioning device, which keeps the fiber Bragg grating in a straight state during the experiment, and provides pre-stress to the fiber Bragg grating when the experiment requires it.

To achieve the above object, the present invention adopts the following technical solutions:

The invention provides a pre-tensioning device, comprising: a base plate; and

Two clamping components relatively arranged on the base plate;

The two clamping assemblies are respectively assembled on the base plate through the first fixed base and the second fixed base; the first fixed base includes a first through hole; the second fixed base includes a second through hole;

The clamping assembly includes a housing with a cavity;

at least two clamping pieces positioned side by side within the housing; and

A force applying rod fixed in combination with one of the clamping pieces;

The force application rod is configured to move along the axial direction of the force application rod;

The force applying rods of the two clamping components pass through the first through hole and the second through hole respectively;

The force application rod of one of the clamping components includes a first extension extending to the outside of the first fixed base along the axial direction of the force application rod; the first extension includes a first tension member; the The first tension member abuts against the outer surface of the first fixed base;

The force applying rod of the other clamping component is connected and fixed with the second fixed base;

Both ends of the housing along the axial direction of the force rod are open;

The clamping assembly also includes a pressing member located on the housing to press and fix the clamping pieces; one end of the pressing member passes through the housing and corresponds to the clamping piece, and the other end is exposed to the outside the case.

In addition, it is preferred that the force applying rod connected to the second fixed base includes a second extension extending to the outside of the second fixed base along the axial direction of the force applying rod; A second tension member is included; the second tension member abuts against the outer surface of the second fixed base.

In addition, preferably, the end of the force application rod connected to the second fixed base away from the clamping piece includes a protruding ring structure; the force application rod connected to the second fixed base is covered with a spring; the One end of the spring abuts against the outer surface of the second fixed base, and the other end abuts against the protruding ring structure.

In addition, it is preferred that the first fixed base includes a first groove formed by inward depression of its top wall surface; in the axial direction of the force applying rod, the first groove The two ends of each pass through two opposite side wall surfaces of the first fixed base;

The second fixed base includes a second groove formed by the inward depression of its top wall surface; in the axial direction of the force applying rod, both ends of the second groove pass through the first Two opposite side wall surfaces of the two fixed bases, the first groove and the second groove are arranged coaxially.

In addition, a preferred solution is that the materials of the base plate and the clamping component are all stainless steel.

In addition, preferably, the housing includes a first screw hole and a fastening bolt arranged in the first screw hole; the fastening bolt is configured such that when the fastening bolt is tightened, the fastening bolt is located at The end inside the housing abuts against one of the clamping pieces and compresses and fixes each clamping piece; the fastening bolt forms the pressing piece.

In addition, it is preferred that the housing includes a receiving groove formed by inward depression of its bottom wall; in the axial direction of the force applying rod, the receiving groove runs through two opposite sides of the housing Wall surface; the clamping piece is located in the receiving groove.

In addition, preferably, the section of the receiving groove is rectangular.

In addition, a preferred solution is that the housing has an arched structure.

The beneficial effects of the present invention are:

The present invention can realize the clamping and fixing of the optical fiber through the cooperation of the clamping piece and the pressing part. After each clamping piece is pressed and fixed, the force rod drives each clamping piece and the housing along its axis direction. movement to realize the pre-stretching of the optical fiber, and the pre-stretching device has a simple structure, convenient operation, strong compatibility, and can be applied to the stretching of optical fibers with different diameters, so that the fiber Bragg grating can be kept in a straight state during the experiment, and Provide prestress to the fiber Bragg grating when needed in the experiment.

Description of drawings

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic structural view 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 arrangements of components and steps, 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 in no way taken as limiting the invention, its application or uses.

Techniques and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

In order to keep the fiber Bragg grating in a straight state during the experiment, and provide prestress to the fiber Bragg grating when the experiment requires. The present invention provides a pre-tensioning device, as shown in FIG. 1 and FIG. 2 , specifically, the pre-tensioning device includes: a substrate 1; and two clamping assemblies 2 relatively arranged on the substrate 1; two clamping assemblies 2 are respectively assembled on the substrate 1 through the first fixed base 3 and the second fixed base 4; the first fixed base 3 includes a first through hole; the second fixed base 4 includes There is a second through hole; the clamping assembly 2 includes a housing 5 with an accommodating cavity; at least two clamping pieces 6 arranged side by side in the housing 5; Force rod 7; the force rod 7 is configured to move along the axial direction of the force rod 7; the force rods 7 of the two clamping assemblies 2 pass through the first through hole and the second through hole respectively; one of them The force application rod 7 of the clamping assembly 2 includes a first extension 8 extending to the outside of the first fixed base along the axial direction of the force application rod 7; the first extension 8 includes a first tensioning Part 9; the first tension member 9 abuts against the outer surface of the first fixed base 3; the force bar 7 of the other clamping assembly 2 is connected and fixed with the second fixed base 4; the housing 5 Both ends along the axial direction of the force applying rod 7 are open; the clamping assembly 2 also includes a pressing member located on the housing 5 for pressing and fixing the clamping pieces 6; One end of the piece passes through the housing 5 and corresponds to the clamping piece 6 , and the other end is exposed outside the housing 5 . The present invention provides a kind of pre-tensioning device, and this pre-tensioning device can be used for the pre-tensioning of optical fiber Bragg grating, clamps optical fiber Bragg grating by arranging at least two clamping pieces 6, twists tension member to make force bar 7 Drive the clamping piece 6 that clamps and fixes the fiber Bragg grating to move to adjust the pre-tensioning force of the pre-tensioning device on the fiber Bragg grating, which is suitable for pre-tensioning operations on different types of fiber Bragg gratings. The pre-tensioning device can keep the fiber Bragg grating in a straightened state during the experiment, and can provide a certain prestress when the experiment requires it, and provides a reliable experimental operation platform, which solves the problem that the fiber Bragg grating is easily broken. The problem of waste of raw materials caused.

It can be understood that the tension member can be a nut screwed on the end of the force application rod 7, and when the clamping sheet 6 is pressed in the housing 5, the force application rod 7 can drive the housing 5 along the direction of the application force. The axial direction of the force rod 7 moves, the first fixed base 3 and the second fixed base 4 are arranged oppositely, and the two clamping assemblies 2 arranged on the base plate 1 are formed into one group, and multiple sets of the above-mentioned components can be assembled on the base plate 1. The clamping component 2 can pre-stretch multiple optical fibers at the same time to improve work efficiency and save working time. Specifically, five sets of clamping components 2 can be arranged side by side on the substrate 1 through a fixed base.

Two clamping components 2 placed on the substrate 1 are used to determine the extension direction of the grating segment of the fiber Bragg grating on a plane parallel to the plane where the substrate 1 is located. The first fixed base 3 and the second fixed base 4 are combined and fixed with the base plate 1 by bolts.

In a specific embodiment, the force application rod connected with the second fixed base includes a second extension extending to the outside of the second fixed base along the axial direction of the force application rod; the second extension The upper part includes a second tension member; the second tension member abuts against the outer surface of the second fixed base. In this embodiment, the two clamping components 2 are connected and matched with the fixed base through the tension member, and can be adjusted to the fiber Bragg grating by adjusting the first tension member 9 and the second tension member respectively when necessary. Provide corresponding preload. It can be understood that, when both the first tension member 9 and the second tension member are nuts, threads are provided on the first extension portion 8 and the second extension portion, and the outer diameter of the nut is larger than that of the first through hole. hole and the aperture of the second through hole.

For the cooperation between the tension member and the force application rod 7, the tension member can also be a tension bolt, and the extension of the force application rod 7 includes a second screw hole opened along the axial direction of the force application rod 7; A tension bolt is screwed in the second screw hole; the tension bolt is located on the side of the fixed base away from the housing 5; a sleeve is sleeved on the extension of the force applying rod 7; one end of the sleeve is connected to the fixed The base is fixed, and the other end abuts against the head of the tension bolt. The role of the sleeve is to support the tension bolt and provide a point of force for it; Axial direction movement. The tension bolt is located on the side of the fixed base away from the housing 5; the diameter of the head of the tension bolt is larger than the inner diameter of the sleeve. It can be understood that the function of the second screw hole is to screw the tension bolt with the force applying rod 7 . There are hexagonal holes on the tension bolt, and the movement and positioning of the clamping component 2 can be realized by twisting the tension bolt, and the pre-tensioning of the optical fiber can be realized. When the clamping component 2 clamps the fiber Bragg grating, the two clamping components can be One of the 2 is fixed, and the clamping component 2 is moved by screwing the tension bolt on the other clamping component 2 to provide pre-tightening force for the optical fiber. The fiber Bragg grating segment that needs to be pre-tensioned is placed between the two clamping components 2, and the fiber Bragg grating can be pre-tensioned by rotating the tension bolt.

In another specific embodiment, the end of the force application rod 7 connected to the second fixed base 4 away from the clamping piece 6 includes a protruding ring structure 13; the force application rod connected to the second fixed base 4 7. A spring 14 is placed on top; one end of the spring 14 abuts against the outer surface of the second fixed base 4, and the other end abuts against the protruding ring structure 13. Through the above arrangement, it is possible to prevent the fiber Bragg grating and the clamping assembly 2 from slack due to a mismatch in expansion or contraction during thermal expansion and contraction.

In a specific embodiment, the first fixed base 3 includes a first groove 15 formed by inwardly recessing its top wall surface; in the axial direction of the force applying rod 7, the The two ends of the first groove 15 pass through the two opposite side wall surfaces of the first fixed base 3; the second fixed base 4 includes a second groove 16 formed by inward depression of its top wall surface ; In the axial direction of the force applying rod 7, the two ends of the second groove 16 pass through the two opposite side wall surfaces of the second fixed base 4, the first groove 15 and the second The grooves 16 are arranged coaxially. Its role is to place the tail grating of the fiber Bragg grating, to reserve a channel for the passage of the fiber Bragg grating, and the fiber grating can pass through the first groove 15 and the second groove 16 from the first fixed base 3 and the second fixed base. Both ends of the seat 4 pass through, so that the fiber grating can be arranged parallel to the horizontal plane.

In a specific embodiment, the substrate 1 and the clamping assembly 2 are made of stainless steel. Stainless steel has good corrosion resistance. The base plate 1 and clamping component 2 made of stainless steel not only have relatively stable chemical properties, but also have very good physical properties, such as high and low temperature resistance, and can be applied to various complex working environments.

In order to fix each clamping piece 6 so that the clamping piece 6 clamps the fiber grating, the housing 5 includes a first screw hole and a fastening bolt 17 arranged in the first screw hole; the fastening bolt 17 It is configured 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 each clamping piece 6; the fastening bolt 17 The compression member is formed. Through the above arrangement, the fastening bolts 17 can stably fix the clamping pieces 6 in the housing 5, so that the optical fiber between the two clamping pieces 6 can be stably clamped.

In an optional embodiment, the housing 5 includes a receiving groove formed by inwardly recessing its bottom wall; in the axial direction of the force applying rod 7, the receiving groove runs through the housing The two opposite side wall surfaces of 5; the clamping piece 6 is located in the accommodating groove, and the aforesaid accommodating groove is used for accommodating the clamping piece 6.

Specifically, the section of the receiving groove is rectangular. Its advantage is that, since the cross-section of the clamping piece 6 is rectangular, the receiving groove with a rectangular cross-section can better cooperate with the clamping piece 6; so that the contact between the clamping piece 6 and the housing 5 after being compressed The larger the area, the greater the mutual friction, preventing the clamping piece 6 from being separated from the housing 5 after the clamping piece 6 is compressed, which will affect the normal operation of the follow-up operation.

In addition, in one embodiment, the housing 5 is in an arched structure, and the bottom surface of the housing 5 is flat so as to limit the rotation. The arched structure bears more uniform force and makes the housing 5 more stable. The arched housing 5 is convenient for assembly; in addition, the cost of raw materials is also saved. The function of the housing 5 is to initially fix the clamping pieces 6; the function of the fastening bolts 17 is to perform secondary compression and fixing on the clamping pieces 6, so as to prevent the fiber Bragg grating from sliding between the clamping pieces 6.

In a specific implementation process, the fiber Bragg grating that needs to be pre-tensioned is clamped between the two clamping pieces 6, and the grating segment of the fiber Bragg grating is placed in the middle of the pre-tensioning device, that is, between the two clamping components 2 , put adhesive tape on the position where the optical fiber needs to be clamped by the clamping piece 6, place the part of the optical fiber with the tape between the two clamping pieces 6, and set the two ends of the fiber Bragg grating horizontally from the first groove 15 And the second groove 16 protrudes, tighten the fastening bolt 17 to make the clamping piece 6 clamp the fiber Bragg grating, screw the nut on the clamping component 2 in the two clamping components 2 to fix the fiber Bragg grating After tightening, keep it fixed, and then turn the nut on the other clamping component 2 to move the clamping component 2 outwards, so as to realize the pre-tension of the fiber Bragg grating, and can connect the fiber Bragg grating The reading of the demodulator is used to control the size of the pre-tension force, and the larger the offset wavelength is, the greater the pre-tension force is.

To sum up, the present invention can realize the clamping and fixing of the optical fiber through the cooperation of the clamping piece and the pressing member. The body moves along its axial direction to realize the pre-stretching of the optical fiber, and the pre-stretching device is simple in structure, easy to operate, and strong in compatibility, and can be applied to the stretching of optical fibers with different diameters, so that the fiber Bragg grating can be kept stretched during the experiment. Straight state, and provide prestress to the fiber Bragg grating when needed in the experiment.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those of ordinary skill in the art can also make It is impossible to exhaustively list all the implementation modes here, and any obvious changes or changes derived from the technical solutions of the present invention are still within the scope of protection 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.

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