Intelligent well lid monitoring system based on optical fiber sensing

Abstract

The utility model discloses an intelligent well lid monitoring system based on optical fiber sensing in the technical field of well lid monitoring, which comprises a well lock, an optical fiber and a well lid detachably locked through the well lock, the well lock elastically clamps and fixes the optical fiber at the bottom of the well lid, the well lock comprises a lock shell, a lock cylinder is connected inside the lock shell in a penetrating manner, and the lock cylinder is connected with the optical fiber. A lock cylinder is arranged on the top of the well lid, a lock tongue is vertically fixed at the bottom of the lock cylinder, the lock tongue can lock the well lid and a well mouth of a monitoring well, so that the well lid is fixedly arranged at the top of the monitoring well, and a crow plate is welded at the bottom of the lock tongue. According to the manhole cover, it can be guaranteed that the optical fiber is integrally separated from the manhole cover without being bent after unlocking through a key, meanwhile, after the manhole cover is violently disassembled and the optical fiber is bent, the bending degree of the optical fiber can be detected through the optical fiber bending sensor, whether the manhole cover is violently disassembled or not is judged in time, and daily maintenance of a monitoring well is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of manhole cover monitoring technology, specifically an intelligent manhole cover monitoring system based on fiber optic sensing. Background Technology

[0002] There are numerous monitoring wells in cities, such as cable trench wells and mobile or telecommunications communication wells. Many of these wells suffer from a lack of effective real-time monitoring and management, leading to frequent cover theft. While manual inspections are currently the primary method to reduce cover loss, they still cannot prevent cover loss. A missing cover poses a significant safety threat to pedestrians and vehicles. Furthermore, when manpower is insufficient for inspections, mechanical locks are often used to secure the covers. However, even with mechanical locks, the risk of cover loss remains high. IoT electronic locks have high power requirements, and the often humid installation environment and the accumulation of toxic and corrosive gases in the wells cause corrosion to electronic locks and other electronic monitoring components, resulting in a high failure rate and poor durability, making them unsuitable for long-term monitoring of manhole covers. Utility Model Content

[0003] The purpose of this invention is to provide an intelligent manhole cover monitoring system based on fiber optic sensing. By setting up a manhole cover and clamp that can be unlocked synchronously, and an optical fiber that monitors the usage status of the manhole cover, the system can detect the degree of bending of the optical fiber after the manhole cover is forcibly opened and the optical fiber is bent by an optical fiber bending sensor.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] The intelligent manhole cover monitoring system based on fiber optic sensing includes a manhole lock, an optical fiber, and a manhole cover that can be detachably locked by the manhole lock. The manhole lock elastically clamps and fixes the optical fiber to the bottom of the manhole cover. The manhole lock includes a lock shell, with a lock cylinder running through the inside of the lock shell. A lock tongue is vertically fixed at the bottom of the lock cylinder. The lock tongue can lock the manhole cover to the manhole opening of the monitoring manhole, so that the manhole cover is fixedly installed on the top of the monitoring manhole. A pry plate is welded to the bottom of the lock tongue. By turning the lock cylinder with a key that is compatible with the lock cylinder, the lock cylinder can drive the lock tongue to rotate. When the lock tongue is compatible with the well hole opened on the manhole cover, the manhole cover can be detached from the manhole opening of the monitoring manhole, so that the manhole cover is separated from the manhole opening of the monitoring manhole, making it convenient for maintenance personnel to open the manhole cover.

[0006] During the process of opening the manhole cover by turning the lock cylinder, the pry bar can be pulled to rotate. When the pry bar rotates, it applies opposite thrusts to both sides of the inner wall of the clamp, which can pull the clamp to rotate around the central axis of the torsion spring, widening the distance between the arc-shaped protrusions of the two clamps, allowing the optical fiber to detach from between the two clamps.

[0007] When maintenance personnel open the manhole cover and detach the optical fiber from between the clamps, the optical fiber will only separate from the two clamps without bending. When the manhole cover is forcibly removed, the optical fiber connected to the removed manhole cover will bend, causing creases or even breakage on the surface of the optical fiber. At this time, the optical fiber bending sensor will compare the bending data detected by the optical fiber with the set bending data. When the comparison result exceeds the set bending data, the alarm will send an alarm signal to the maintenance personnel's terminal device through the built-in WIFI module.

[0008] The surface of the lock cylinder is movably connected to the locking nut via a bearing. The locking nut and the lock housing are respectively fixed inside the manhole cover. A limit frame is welded to the bottom of the locking nut, and a clamp is connected to the bottom of the limit frame via a torsion spring. At least one end of the optical fiber is connected to an optical fiber bending sensor. By setting the manhole cover and clamp to unlock synchronously, it can be ensured that the optical fiber and the manhole cover are completely detached without bending after being unlocked with a key. At the same time, an alarm signal can be sent to the maintenance personnel's terminal device via an alarm device after the manhole cover is forcibly opened.

[0009] As a further embodiment of this utility model: the limiting frame is symmetrical about the central axis of the lock cylinder, and a cavity is formed inside the limiting frame to restrict the movement angle of the lock tongue in the horizontal direction. By limiting the movement angle of the lock tongue through the limiting frame, the limiting frame can limit the lock tongue while connecting the clamp, which facilitates the quick opening or locking of the manhole cover.

[0010] As a further embodiment of this utility model: the width of the locking tongue does not exceed one-third of the length of the cavity, and the length of the locking tongue is not less than 5 cm. By setting the width of the locking tongue to not exceed one-third of the length of the cavity, it can be ensured that the locking tongue can move on its left and right sides, which is convenient for locking or opening the manhole cover.

[0011] As a further embodiment of this utility model: the clamp includes two clamping plates, and an arc-shaped protrusion is formed in the middle of each of the two clamping plates. A fiber optic clamping part with a circular cross-section is formed between the two arc-shaped protrusions. The fiber optic cable tangentially passes through the fiber optic clamping part. The diameter of the circular fiber optic clamping part is equal to the diameter of the fiber optic cable. The fiber optic clamping part can clamp the surface of the fiber optic cable, fix the fiber optic cable to the bottom of the manhole cover, and monitor the usage status of the manhole cover through the fiber optic cable.

[0012] As a further embodiment of this utility model: the optical fiber bending sensor is connected to both ends of the optical fiber, and the optical fiber bending sensor is used to monitor the bending degree of the optical fiber and determine whether the optical fiber has been bent or broken.

[0013] As a further embodiment of this utility model: the top of the manhole cover is provided with a well hole adapted to the locking tongue. By adapting the locking tongue to the well hole, the manhole cover and clamp can be opened by rotating the lock cylinder.

[0014] As a further embodiment of this utility model: an alarm is connected to the bottom of the fiber optic bending sensor, and a WIFI module is installed inside the alarm. The WIFI module is used to transmit alarm signals to the terminal device of maintenance personnel, so as to promptly notify maintenance personnel to maintain the monitoring well after the manhole cover is forcibly removed.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. In this utility model, by setting a manhole cover and clamp that can be unlocked synchronously, and an optical fiber for monitoring the usage status of the manhole cover, it can be ensured that the optical fiber and the manhole cover are completely separated after being unlocked with a key without bending. At the same time, after the manhole cover is forcibly disassembled and the optical fiber is bent, the degree of bending of the optical fiber can be detected by the optical fiber bending sensor, so as to determine in time whether the manhole cover is opened by forceful disassembly, which facilitates the daily maintenance of the manhole.

[0017] 2. In this utility model, the limiting frame restricts the movement angle of the locking tongue, enabling the limiting frame to limit the locking tongue while connecting the clamp, facilitating the quick opening or locking of the manhole cover. By using an alarm device to send an alarm signal to the terminal equipment of maintenance personnel, it is convenient to monitor the daily maintenance of the well facilities. Attached Figure Description

[0018] Figure 1 This is a diagram of the intelligent manhole cover monitoring system of this utility model;

[0019] Figure 2 This is a structural diagram of the well lock of this utility model;

[0020] Figure 3 This is a front view of the well lock of this utility model.

[0021] In the diagram: 1. Lock housing; 111. Well hole; 2. Lock cylinder; 3. Lock tongue; 4. Pry bar; 5. Locking nut; 6. Limiting frame; 7. Cavity; 8. Clamp; 801. Arc-shaped protrusion; 9. Optical fiber; 10. Optical fiber bending sensor; 11. Well cover; 12. Alarm. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example:

[0024] Please see Figures 1-3 In this embodiment of the utility model, the intelligent manhole cover monitoring system based on fiber optic sensing includes a manhole lock, an optical fiber 9, and a manhole cover 11 that can be detachably locked by the manhole lock. The manhole lock elastically clamps and fixes the optical fiber 9 to the bottom of the manhole cover 11. The manhole lock includes a lock shell 1, and a lock core 2 is connected through the inside of the lock shell 1. A lock tongue 3 is vertically fixed at the bottom of the lock core 2. The lock tongue 3 can lock the manhole cover 11 to the well opening of the monitoring well, so that the manhole cover 11 is fixedly installed on the top of the monitoring well. A pry plate 4 is welded to the bottom of the lock tongue 3. By using a key adapted to the lock core 2 to turn the lock core 2, the lock tongue 3 can be driven to rotate through the lock core 2. When the lock tongue 3 is adapted to the well hole 111 opened on the manhole cover 11, the manhole cover 11 can be disassembled from the well opening of the monitoring well, so that the manhole cover 11 is separated from the well opening of the monitoring well, making it convenient for maintenance personnel to open the manhole cover 11.

[0025] During the process of opening the manhole cover 11 by rotating the lock core 2, the pry bar 4 can be pulled to rotate by the lock core 2. When the pry bar 4 rotates, it applies opposite thrusts to both sides of the inner wall of the clamp 8, which can pull the clamp 8 to rotate around the central axis of the torsion spring, thus widening the distance between the arc-shaped protrusions 801 of the two clamps and causing the optical fiber 9 to detach from the two clamps.

[0026] When maintenance personnel open the manhole cover 11 and detach the optical fiber 9 from between the clamps, the optical fiber 9 will only separate from the two clamps without bending. When the manhole cover 11 is forcibly disassembled and opened, the optical fiber 9 connected to the disassembled manhole cover 11 will bend, causing creases or even breakage on the surface of the optical fiber 9. At this time, the optical fiber bending sensor 10 will compare the detected bending data of the optical fiber 9 with the set bending data. When the comparison result exceeds the set bending data, the alarm 12 will send an alarm signal to the maintenance personnel's terminal device through the built-in WIFI module.

[0027] The surface of the lock cylinder 2 is movably connected to the locking nut 5 via a bearing. The locking nut 5 and the lock shell 1 are respectively fixed inside the manhole cover 11. A limit frame 6 is welded to the bottom of the locking nut 5. A clamp 8 is connected to the bottom of the limit frame 6 via a torsion spring. At least one end of the optical fiber 9 is connected to an optical fiber bending sensor 10. By setting the manhole cover 11 and the clamp 8 to unlock synchronously, it can be ensured that the optical fiber 9 and the manhole cover 11 are completely separated without bending after being unlocked by the key. At the same time, after the manhole cover 11 is forcibly disassembled, an alarm signal can be sent to the terminal equipment of the maintenance personnel via the alarm 12.

[0028] Preferably, the limiting frame 6 is symmetrical about the central axis of the lock cylinder 2, and the interior of the limiting frame 6 forms a cavity 7 that restricts the movement angle of the locking tongue 3 in the horizontal direction. By limiting the movement angle of the locking tongue 3 through the limiting frame 6, the limiting frame 6 can limit the locking tongue 3 while connecting the clamp 8, which facilitates the quick opening or locking of the manhole cover 11.

[0029] Preferably, the width of the locking tongue 3 is no more than one-third of the length of the cavity 7, and the length of the locking tongue 3 is no less than 5 cm. By setting the width of the locking tongue 3 to no more than one-third of the length of the cavity 7, it can be ensured that the locking tongue 3 can move on its left and right sides, which is convenient for locking or opening the manhole cover 11.

[0030] Preferably, the clamp 8 includes two clamping plates, and arc-shaped protrusions 801 are formed in the middle of the two clamping plates respectively. A fiber optic clamping part with a circular cross-section is formed between the two arc-shaped protrusions 801. The fiber optics tangentially pass through the fiber optic clamping part. The diameter of the circular fiber optic clamping part is equal to the diameter of the fiber optic 9. The fiber optic clamping part can clamp the surface of the fiber optic 9 and fix the fiber optic 9 to the bottom of the manhole cover 11. The usage status of the manhole cover 11 is monitored through the fiber optic 9.

[0031] Preferably, the fiber optic bending sensor 10 is connected to both ends of the fiber optic 9. The fiber optic bending sensor 10 is used to monitor the bending degree of the fiber optic 9 and determine whether the fiber optic 9 has bent or broken.

[0032] Preferably, the top of the manhole cover 11 has a through hole 111 for the locking tongue 3. By the locking tongue 3 fitting the through hole 111, the manhole cover 11 and the clamp 8 can be opened by rotating the lock cylinder 2.

[0033] Preferably, an alarm 12 is connected to the bottom of the fiber optic bending sensor 10. The alarm 12 is equipped with a WIFI module. The WIFI module is used to transmit alarm signals to the terminal equipment of maintenance personnel, so that maintenance personnel can be notified in time to maintain the monitoring well after the manhole cover 11 is forcibly removed.

[0034] The working principle of this utility model is as follows: During installation, the optical fiber 9 is clamped by the clamp 8 and fixed to the bottom of the manhole cover 11. One or both ends of the optical fiber 9 are connected to the optical fiber bending sensor 10. The optical fiber bending sensor 10 detects the degree of bending of the optical fiber 9. The lock core 2 passes through the manhole cover 11 and is connected to the manhole cover 11 through the lock shell 1. The manhole cover 11 and the optical fiber 9 can be locked by the manhole lock. When the maintenance personnel open the manhole cover 11 and detach the optical fiber 9 from between the clamps, the optical fiber 9 will only separate from the two clamps without bending. When the manhole cover 11 is forcibly disassembled and opened, the optical fiber 9 connected to the disassembled manhole cover 11 will bend, causing creases or even breakage on the surface of the optical fiber 9. At this time, the optical fiber bending sensor 10 compares the detected bending data of the optical fiber 9 with the set bending data. When the comparison result exceeds the set bending data, the alarm 12 will send an alarm signal to the maintenance personnel's terminal device through the built-in WIFI module.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An intelligent manhole cover monitoring system based on fiber optic sensing, characterized in that: The well lock includes a well lock, an optical fiber (9), and a well cover (11) that can be detachably locked by the well lock. The well lock includes a lock shell (1), a lock cylinder (2) that is connected through the inside of the lock shell (1), a lock tongue (3) that is vertically fixed at the bottom of the lock cylinder (2), a pry plate (4) that is welded to the bottom of the lock tongue (3), a locking nut (5) that is movably connected to the surface of the lock cylinder (2) by a bearing, the locking nut (5) and the lock shell (1) that are respectively fixed inside the well cover (11), a limit frame (6) that is welded to the bottom of the locking nut (5), a clamp (8) that is connected to the bottom of the limit frame (6) by a torsion spring, and an optical fiber bending sensor (10) that is connected to at least one end of the optical fiber (9).

2. The intelligent manhole cover monitoring system based on fiber optic sensing according to claim 1, characterized in that: The limiting frame (6) is symmetrical about the central axis of the lock cylinder (2), and a cavity (7) is formed inside the limiting frame (6) to restrict the movement angle of the lock tongue (3) in the horizontal direction.

3. The intelligent manhole cover monitoring system based on fiber optic sensing according to claim 2, characterized in that: The width of the latch (3) does not exceed one-third of the length of the cavity (7), and the length of the latch (3) is not less than 5 centimeters.

4. The intelligent manhole cover monitoring system based on fiber optic sensing according to claim 1, characterized in that: The clamp (8) includes two clamping plates, and arc-shaped protrusions (801) are formed in the middle of the two clamping plates respectively. An optical fiber clamping part with a circular cross-section is formed between the two arc-shaped protrusions (801), and the optical fiber tangentially passes through the optical fiber clamping part.

5. The intelligent manhole cover monitoring system based on fiber optic sensing according to claim 1, characterized in that: The fiber optic bend sensor (10) is connected to both ends of the fiber optic cable (9). The fiber optic bend sensor (10) is used to monitor the degree of bending of the fiber optic cable (9) and determine whether the fiber optic cable (9) has broken.

6. The intelligent manhole cover monitoring system based on fiber optic sensing according to claim 1, characterized in that: The top of the manhole cover (11) has a through-hole (111) adapted to the locking tongue (3).

7. The intelligent manhole cover monitoring system based on fiber optic sensing according to claim 1, characterized in that: The bottom of the fiber optic bend sensor (10) is connected to an alarm (12), and the alarm (12) is equipped with a WIFI module, which is used to transmit alarm signals to the terminal equipment of maintenance personnel.

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