Optical fiber pull-resistance buffer device

Abstract

The application relates to an optical fiber anti-pulling buffer device, which relates to an optical fiber installation auxiliary device, comprising a force-bearing ring and a limiting ring, the force-bearing ring is fixedly installed on a base body, at least one annular friction groove for winding the optical fiber is arranged on the outer wall of the force-bearing ring; the groove width and groove depth of the annular friction groove are not less than n times of the fiber diameter, and n is the winding number; an energy-absorbing notch is arranged on the force-bearing ring, and a monitoring device for monitoring the deformation amount of the energy-absorbing notch is installed at the movable end of the energy-absorbing notch; at least two limiting ring grooves are radially formed in the force-bearing ring, and the limiting ring is installed in the limiting ring groove. The optical fiber is wound on the annular friction groove of the force-bearing ring, the friction resistance between the optical fiber and the annular friction groove is utilized, and the optical fiber is prevented from being pulled; due to the elastic structure of the force-bearing ring, the pulling impact can be buffered, and the sensor is guaranteed not to be damaged. The application can also guarantee that the optical fiber signal loss is not increased, and has the characteristics of good weather resistance and durability, reliable structure, low cost and easy popularization and application.

Description

TECHNICAL FIELD

[0001] The present application relates to an optical fiber installation auxiliary device, in particular to an optical fiber anti-pulling buffer device. BACKGROUND

[0002] With the development of optical fiber sensing technology, more and more optical fiber sensors are designed and made. Generally, due to the small size of optical fiber, such as the outer diameter of single-mode optical fiber with coating layer is about 0.2mm, the shear strength is low, and it is usually packaged on the measurement substrate by gluing, metalized welding and other methods. However, in the production and installation process, it is difficult to avoid pulling the optical fiber, and the optical fiber is very easy to be pulled off from the inside gluing or welding of the sensor, resulting in damage to the sensor.

[0003] In order to facilitate the secondary processing of optical fiber, optical fiber is generally divided into tight package optical fiber and non-tight package optical fiber. The optical fiber of tight package optical fiber is tightly attached or bonded with the sleeve as a whole; while the optical fiber of non-tight package optical fiber is independent of the sleeve. The optical fiber used in the sensor is usually non-tight package optical fiber. In order to protect the optical fiber, the optical fiber inside the sensor is re-sleeved, and the sleeve is fixed to the inside of the sensor by pasting, and at the same time, an armored wire is added outside the sensor, and is fixed on the sensor shell through the connector. Through the above measures, although the optical fiber can be isolated from being pulled off due to the external pulling of the armored wire, in actual engineering application, the sensor needs to be connected by optical fiber fusion, and in the process of optical fiber fusion, the optical fiber is directly pulled, at this time, the optical fiber and the sleeve are independent, the sleeve loses the protection effect, and the bare optical fiber will still be pulled off from the pasting or welding place, causing damage to the sensor. In addition, using glue to fix the optical fiber also has the problem of aging of the glue, which is difficult to ensure durability. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an optical fiber anti-pulling buffer device which can buffer and limit the pulling of the optical fiber without using glue, ensure that the sensor is not damaged, and ensure that the optical fiber signal loss is not increased.

[0005] The technical solution for solving the above technical problems is: an optical fiber anti-pulling buffer device, comprising a load ring of a circular ring structure, the load ring is fixedly installed on a substrate, at least one annular friction groove for winding the optical fiber is arranged on the outer wall of the load ring; and an energy absorbing notch is further arranged on the load ring, and a monitoring device for monitoring the deformation amount of the energy absorbing notch is installed at the movable end of the energy absorbing notch.

[0006] Further technical solutions of the present application are: the monitoring device comprises a monitoring pointer and a monitoring disc, one end of the monitoring pointer is fixed on the movable end of the energy-absorbing notch of the force-bearing ring along the radial direction of the force-bearing ring, and the other end of the monitoring pointer is connected with the monitoring disc; the monitoring disc is in the shape of a circular arc, the center of the monitoring disc is consistent with the center of the force-bearing ring, and the monitoring disc is respectively provided with a safe deformation amount area for indicating that the pulling force is negligible and a dangerous deformation amount area for indicating that the pulling force is too large.

[0007] Further technical solutions of the present application are: the safe deformation amount area is a green area, and the dangerous deformation amount area is a yellow area; the initial position of the green area is consistent with the initial position of the monitoring pointer when the energy-absorbing notch is not deformed, and the terminal position of the green area is consistent with the initial position of the yellow area.

[0008] Further technical solutions of the present application are: the included angle between the initial position and the terminal position of the green area, that is, the central angle θ1 of the green area, is calculated according to the formula: θ1r=X1, X1 is the safe deformation amount of the energy-absorbing notch, and X1=0.6F / K; the included angle between the initial position and the terminal position of the yellow area, that is, the central angle θ2 of the yellow area, is calculated according to the formula: (θ1+θ2)r=X2, X2 is the allowable deformation amount of the energy-absorbing notch, and X2=0.8F / K; in the above formula, r is the radius of the force-bearing ring, F is a known force required for closing the energy-absorbing notch, and K is the stiffness of the force-bearing ring.

[0009] Further technical solutions of the present application are: the deformation amount X of the energy-absorbing notch reflected on the disc is calculated according to the formula: X=θR, θ is the central angle through which the pointer turns, and R is the distance from the terminal end of the indicating end of the pointer to the center Q of the force-bearing ring; when 0≤X≤X1, the monitoring pointer points to the green area; and when X1X≤X2, the monitoring pointer points to the yellow area.

[0010] Further technical solutions of the present application are: the width and the depth of the annular friction groove are not less than n times of the diameter of the optical fiber, and n is the number of winding turns.

[0011] Further technical solutions of the present application are: the cross-sectional shape of the annular friction groove is square, V-shaped or U-shaped.

[0012] Further technical solutions of the present application are: the winding radius of the optical fiber is greater than or equal to the allowable radius of optical fiber loss + (energy-absorbing notch width / 2π).

[0013] Further technical solutions of the present application are: the force-bearing ring is further provided with a mounting boss, the mounting boss is provided with a mounting through hole, and the force-bearing ring is fixed on the base body through a fastener penetrating through the mounting through hole.

[0014] Further technical solutions of the present application are: the device further comprises a limiting ring for limiting the optical fiber; the force-bearing ring is provided with at least two limiting ring grooves in the radial direction, and the limiting ring is installed in the limiting ring groove.

[0015] Due to the adoption of the above structure, the optical fiber anti-pulling buffer device has the following beneficial effects compared with the prior art:

[0016] 1. The optical fiber can be buffered and limited to be pulled

[0017] The application comprises a ring-shaped load ring fixedly installed on a base, and at least one annular friction groove for winding the optical fiber is arranged on the outer wall of the load ring; and an energy-absorbing notch is further arranged on the load ring. In use, the optical fiber is wound on the annular friction groove of the load ring, and the anchoring of the optical fiber is realized through the friction resistance between the optical fiber and the annular friction groove, so as to achieve the purpose of anti-pulling of the optical fiber. When the optical fiber is suddenly pulled, since the load ring is an elastic structure with the energy-absorbing notch, with the increase of the pulling force, the energy-absorbing notch of the load ring gradually decreases until it is closed, and the energy-absorbing notch is restored when the pulling force disappears. Therefore, the pulling impact can be buffered by the load ring, so as to prevent the optical fiber from being pulled off.

[0018] Further, the size of the energy-absorbing notch on the load ring is designed, and the closed energy-absorbing notch can resist greater pulling impact.

[0019] In summary, the application can buffer and limit the pulling of the optical fiber, and realize the anti-pulling of the non-tight optical fiber.

[0020] 2. The sensor can be guaranteed not to be damaged

[0021] In addition to buffering and limiting the pulling of the optical fiber and preventing the sensor from being easily damaged, a monitoring device for monitoring the deformation amount of the energy-absorbing notch is installed at the movable end of the energy-absorbing notch, the monitoring device comprises a monitoring pointer and a monitoring disc, one end of the monitoring pointer is fixed on the movable end of the energy-absorbing notch of the load ring along the radial direction of the load ring, and the other end of the monitoring pointer is connected with the monitoring disc; the monitoring disc is arc-shaped, the center of the monitoring disc is consistent with the center of the load ring, and the monitoring disc is respectively provided with a safe deformation amount area for indicating negligible pulling force and a dangerous deformation amount area for indicating excessive pulling force, wherein the safe deformation amount area is a green area, and the dangerous deformation amount area is a yellow area. In use, when the monitoring pointer points to the green area, it indicates that the deformation amount of the energy-absorbing notch is small and within the safe deformation amount, and the pulling force can be ignored; at this time, the optical fiber anti-pulling buffer device of the application does not need to be adjusted and can continue to work. When the monitoring pointer points to the yellow area, it indicates that the deformation amount of the energy-absorbing notch is large and between the safe deformation amount and the allowable deformation amount, and the pulling force is excessive; at this time, the optical fiber anti-pulling buffer device of the application needs to be stopped working immediately for adjustment. Therefore, the monitoring device can guarantee that the sensor is not damaged due to excessive pulling force.

[0022] 3. The optical fiber signal loss can be guaranteed not to be increased

[0023] In the present application, the friction groove for winding the optical fiber is of a ring structure, and there is no large-curvature bending and local concentrated stress, so that the optical fiber loss can be reduced. Moreover, the present application is designed according to the minimum bending diameter of the force-bearing ring based on the optical fiber loss performance, and the winding radius of the optical fiber is greater than the allowable radius R of the optical fiber loss, so that the optical fiber bending loss can be reduced to the maximum extent under the minimum diameter of the force-bearing ring. Therefore, the present application can ensure that the optical fiber signal loss is not increased.

[0024] 4. Good weather resistance and durability

[0025] In the present application, the optical fiber is wound on the ring-shaped friction groove of the force-bearing ring, and the optical fiber anchoring is realized through the friction between the optical fiber and the ring-shaped friction groove, so that the optical fiber is resistant to pulling, and no glue is used for sticking, and the weather resistance and durability are good.

[0026] 5. Reliable structure

[0027] The present application comprises a limiting ring, and the force-bearing ring is provided with at least two limiting ring grooves in the radial direction, and the limiting ring is installed in the limiting ring groove and acts to limit the optical fiber and prevent the optical fiber from being pulled out of the ring-shaped friction groove under the condition of no tension, and the structure is relatively reliable.

[0028] 6. Low cost and easy to popularize and apply.

[0029] In the following, the technical features of the optical fiber anti-pulling buffer device of the present application are further described in combination with the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 : The structure diagram of the optical fiber anti-pulling buffer device of the present application,

[0031] Figure 2 : The structure diagram of the force-bearing ring of Example 1,

[0032] Figure 3 : The principle diagram of the division of the green zone and the yellow zone of the monitoring disc;

[0033] In the above drawings, the explanations of the reference signs are as follows:

[0034] 1 - force-bearing ring,

[0035] 101 - ring-shaped friction groove, 102 - limiting ring groove, 103 - energy-absorbing notch, 104 - mounting boss, 1041 - mounting through hole,

[0036] 2 - limiting ring, 3 - mounting screw, 4 - optical fiber,

[0037] 5 - monitoring device, 501 - monitoring pointer, 502 - monitoring disc, 5021 - green zone, 5022 - yellow zone;

[0038] Q-center of the force ring and the monitoring disc. DETAILED DESCRIPTION Embodiment One

[0039] An optical fiber anti-pulling buffer device, comprising a force ring 1 and a limiting ring 2, wherein:

[0040] The force ring 1 is a circular ring structure, and an annular friction groove 101 for winding an optical fiber 4 is arranged on the outer wall of the force ring 1. The groove width and groove depth of the annular friction groove 101 are not less than n times of the fiber diameter, and n is the number of winding turns. The cross-sectional shape of the annular friction groove 101 is square, and the winding radius of the optical fiber 4 is greater than or equal to the allowable radius of the optical fiber loss. The force ring 1 has two limiting ring grooves 102 along the radial direction.

[0041] The force ring 1 is further provided with an energy-absorbing notch 103. As the pulling force increases, the energy-absorbing notch of the force ring gradually decreases until it is closed. When the pulling force disappears, the energy-absorbing notch recovers. Through the force ring, the pulling impact can be buffered to prevent the optical fiber from being pulled off. At this time, the winding radius of the optical fiber 4 is greater than or equal to the allowable radius of the optical fiber loss + (energy-absorbing notch width / 2π). In actual use, the size of the energy-absorbing notch on the force ring can be designed according to the actual stiffness of the force ring and the actual strength of the optical fiber. After the energy-absorbing notch is closed, greater pulling impact can be resisted.

[0042] The force ring 1 is further provided with a mounting boss 104, and the mounting boss 104 is provided with a mounting through hole 1041. A fastener, i.e., a mounting screw 3, passes through the mounting through hole 1041 to fix the force ring 1 on a base body.

[0043] The present application further comprises a monitoring device 5 for monitoring the deformation amount of the energy-absorbing notch 103 at the movable end (the end opposite to the mounting boss 104) of the energy-absorbing notch 103. The monitoring device 5 comprises a monitoring pointer 501 and a monitoring disc 502. One end of the monitoring pointer 501 is fixed to the movable end of the energy-absorbing notch 103 of the force ring 1 along the radial direction of the force ring 1, and the other end of the monitoring pointer 501 is connected to the monitoring disc 502. The monitoring disc 502 is in the shape of a circular arc, and the center of the monitoring disc 502 is consistent with the center of the force ring 1. The monitoring disc 502 is provided with a safe deformation amount area for indicating that the pulling force is negligible and a dangerous deformation amount area for indicating that the pulling force is too large. The safe deformation amount area is a green area 5021, and the dangerous deformation amount area is a yellow area 5022. The initial position of the green area 5021 coincides with the initial position of the monitoring pointer when the energy-absorbing notch is not deformed, and the end position of the green area 5021 coincides with the initial position of the yellow area 5022.

[0044] The present application utilizes the principle of small deformation, and the chord length of the circular arc deformation is equal to the arc length. The central angles of the green area 5021 and the yellow area 5021 are designed as follows:

[0045] The included angle of the initial position and the terminal position of the green area 5021, that is, the central angle of the green area 5021, is calculated by the formula: θ1r=X1, wherein r is the radius of the force-bearing ring (that is, half of the sum of the outer radius and the inner radius of the force-bearing ring), X1 is the safety deformation of the energy-absorbing notch, and X1=0.6F / K, F is a known force required for closing the energy-absorbing notch, and K is the stiffness of the force-bearing ring, and the size is approximately equal to k0 / πr, and k0 is the compression stiffness of the metal of the force-bearing ring.

[0046] The included angle of the initial position and the terminal position of the yellow area 5021, that is, the central angle of the yellow area 5021, is calculated by the formula: (θ1+θ2) r=X2, wherein r is the radius of the force-bearing ring (that is, half of the sum of the outer radius and the inner radius of the force-bearing ring), X2 is the allowable deformation of the energy-absorbing notch, and X2=0.8F / K, F is a known force required for closing the energy-absorbing notch, and K is the stiffness of the force-bearing ring.

[0047] The deformation X of the energy-absorbing notch reflected on the disc is calculated by the formula: X=θR, wherein θ is the central angle through which the pointer turns, and R is the distance from the end point of the indicating end of the pointer to the center Q of the force-bearing ring, when 0≤X≤X1, the monitoring pointer 501 is in the green area, and when X1X≤X2, the monitoring pointer 501 is in the yellow area.

[0048] The material of the limiting ring 2 is a rubber ring, the limiting ring 2 is installed in the limiting ring groove 102 of the force-bearing ring 1, and the limiting ring 2 is used for limiting the optical fiber 4 and preventing the optical fiber 4 from being pulled out of the annular friction groove 101 under the condition of not being pulled.

[0049] The optical fiber 4 is a bare optical fiber or a jacketed optical fiber.

[0050] The anti-pulling principle of the application is that:

[0051] In use, the optical fiber 4 is wound on the annular friction groove 101 of the force-bearing ring 1, the friction resistance between the optical fiber 4 and the annular friction groove 101 is used to realize the anchoring of the optical fiber, and the purpose of resisting the pulling of the optical fiber is achieved.

[0052] The buffering principle of the application is that:

[0053] When the optical fiber is suddenly pulled, the force-bearing ring is an elastic structure with an energy-absorbing notch, and the pulling impact can be buffered to prevent the optical fiber from being pulled off.

[0054] The working principle of the monitoring device of the application is that:

[0055] When the monitoring pointer points at the green area, it indicates that the deformation of the energy-absorbing notch is small, within the safe deformation, and the pulling force can be ignored; at this time, the optical fiber anti-pulling buffer device of the application does not need to be adjusted and can continue to work. When the monitoring pointer points at the yellow area, it indicates that the deformation of the energy-absorbing notch is large, between the safe deformation and the allowable deformation, and the pulling force is too large; at this time, the optical fiber anti-pulling buffer device of the application needs to be stopped immediately for adjustment. Therefore, the application can ensure that the sensor is not damaged by excessive pulling force through the monitoring device.

[0056] As a variation of the first embodiment, the number of annular friction grooves 101 can also be designed as two or three or more according to actual needs.

[0057] As another variation of the first embodiment, the number of limiting ring grooves 102 and limiting rings 2 can also be not only two, but also four or six or others.

[0058] As another variation of the first embodiment, the cross-sectional shape of the annular friction groove 101 can also be V-shaped or U-shaped or other shapes.

Claims

1. An optical fiber pull-resistance buffer device, characterized by: The application relates to a force-bearing ring (1) comprising a circular ring structure, which is fixedly installed on a base body, and at least one annular friction groove (101) for winding an optical fiber (4) is arranged on the outer wall of the force-bearing ring (1); and an energy-absorbing notch (103) is further arranged on the force-bearing ring (1), and a monitoring device (5) for monitoring the deformation amount of the energy-absorbing notch is installed on the movable end of the energy-absorbing notch (103); the monitoring device (5) comprises a monitoring pointer (501) and a monitoring disc (502), one end of the monitoring pointer (501) is fixed on the movable end of the energy-absorbing notch (103) of the force-bearing ring (1) along the radial direction of the force-bearing ring (1), and the other end of the monitoring pointer (501) is connected with the monitoring disc (502); the monitoring disc (502) is in the shape of a circular arc, the center of the monitoring disc (502) is consistent with the center of the force-bearing ring (1), and a safe deformation amount zone for indicating that the pulling force is negligible and a dangerous deformation amount zone for indicating that the pulling force is too large are arranged on the monitoring disc (502) respectively; the winding radius of the optical fiber is greater than the allowable radius of optical fiber loss plus (the width of the energy-absorbing notch / 2pi).

2. A fiber optic pull-resisting buffer according to claim 1, wherein: The safe deformation amount zone is a green zone (5021), and the dangerous deformation amount zone is a yellow zone (5022); the initial position of the green zone (5021) is coincident with the initial position of the monitoring pointer when the energy-absorbing notch is not deformed, and the terminal position of the green zone (5021) is coincident with the initial position of the yellow zone (5022).

3. A fiber-optic pull-resisting buffer according to claim 2, wherein: The included angle between the initial position and the terminal position of the green zone (5021) is the central angle theta1 of the green zone (5021), and the calculation formula is theta1r=X1, wherein X1 is the safe deformation amount of the energy-absorbing notch, and X1=0.6F / K; the included angle between the initial position and the terminal position of the yellow zone (5022) is the central angle theta2 of the yellow zone (5022), and the calculation formula is (theta1+theta2)r=X2, wherein X2 is the allowable deformation amount of the energy-absorbing notch, and X2=0.8F / K; in the above formula, r is the radius of the force-bearing ring, F is a known force required for closing the energy-absorbing notch, and K is the stiffness of the force-bearing ring.

4. An optical fiber pull-proof buffer according to claim 3, wherein: The calculation formula of the deformation amount X of the energy-absorbing notch reflected on the disc is X=thetaR, wherein theta is the central angle of the pointer, and R is the distance from the terminal end of the indicating end of the pointer to the center Q of the force-bearing ring; when 0<=X<=X1, the monitoring pointer (501) points to the green zone; and when X1X<=X2, the monitoring pointer (501) points to the yellow zone.

5. The fiber-optic pull-resisting buffer of claim 1, wherein: The groove width and groove depth of the annular friction groove (101) are not less than n times of the fiber diameter, and n is the winding number.

6. A fiber-optic pull-resisting buffer according to claim 1, wherein: The cross-sectional shape of the annular friction groove (101) is square, V-shaped or U-shaped.

7. The fiber-optic pull-resisting buffer of claim 1, wherein: The force-bearing ring (1) is further provided with a mounting boss (104), the mounting boss (104) is provided with a mounting through hole (1041), and the force-bearing ring (1) is fixed on the base body through fasteners penetrating through the mounting through hole (1041).

8. An optical fiber pull-resistance buffer device according to any one of claims 1 to 7, characterized in that: The device further comprises a limiting ring (2) for limiting the optical fiber (4); the force-bearing ring (1) is provided with at least two limiting ring grooves (102) along the radial direction, and the limiting ring (2) is installed in the limiting ring groove (102).

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