Buried fiber grating type perimeter intrusion detector

Abstract

The utility model relates to the technical field of optical fiber sensing, and discloses a buried fiber grating type perimeter intrusion detector, which comprises an outer shell, auxiliary fixing mechanisms are fixedly connected below the left side and the right side of the outer shell, and a penetrating type extending opening is formed in the upper surface of the interior of the outer shell. A top plate is arranged on the upper surface of the outer shell and located above the extending opening, a detection box is fixedly connected to the lower surface of the top plate, the auxiliary fixing mechanism comprises fixing boxes, and first piston plates are slidably connected to the interiors of the two fixing boxes. The detection box can be controlled to ascend or descend by driving the arranged rotating disc to rotate, the detection box can extend out of the upper portion of the outer shell, meanwhile, components in the detector can be maintained or overhauled through the arranged access door, and it is not needed to excavate the whole device and then disassemble the device for overhauling or maintenance. Therefore, the convenience and practicability of the device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber sensing, and more specifically to a buried fiber grating type perimeter intrusion detector. Background Art

[0002] Optical fiber perimeter products can be divided into two types according to the installation scenario: hanging network and buried. The buried optical fiber perimeter protection products have the advantages of good concealment and strong anti-environmental interference ability. Therefore, they effectively improve the intelligent level and response speed of the security system in the engineering field, escort the safety of various important facilities and places. In order to monitor and process the surface pressure around them, a corresponding buried fiber grating type intrusion detector is required;

[0003] In the prior art (publication number: CN216310967U), a branch node type buried vibration intrusion detector is disclosed. The technology includes a lower housing, an upper housing is installed at the top end of the lower housing. One end inside the lower housing is provided with a metal diaphragm, the outer walls of the metal diaphragms are fixedly connected to the inner walls of the lower housing. A fiber grating is pasted at the center position of the top end of the metal diaphragm. An upper pressure chamber is provided inside the lower housing and the upper housing above the metal diaphragm. A lower pressure chamber is provided inside the lower housing below the metal diaphragm. Branch flow frames are provided at one end of the lower housing and the upper housing. Flow guide pipes are provided at the ends of the branch flow frames close to the lower housing and the upper housing. The ends of the flow guide pipes away from the branch flow frames extend into the upper pressure chamber and the lower pressure chamber respectively. This device not only improves the monitoring effect when the intrusion detector is in use, improves the convenience when the intrusion detector is in use, but also improves the stability when the intrusion detector is in use;

[0004] When the above device is integrally buried below the ground, subsequent maintenance requires the entire device to be dug out for disassembly and repair, thus reducing the practicality and convenience of the device. Summary of the Utility Model

[0005] The main technical problem to be solved by the utility model is to provide a buried fiber grating type perimeter intrusion detector, which can solve the problem that when the detector is integrally buried below the ground, subsequent maintenance requires the entire device to be dug out for disassembly and repair.

[0006] To solve the above technical problem, according to one aspect of the utility model, more specifically, a buried fiber grating type perimeter intrusion detector includes a housing body. Auxiliary fixing mechanisms are fixedly connected to both the lower left side and the lower right side of the housing body. A through extending port is opened on the upper surface inside the housing body. A top plate is arranged on the upper surface of the housing body and above the extending port. A detection box is fixedly connected to the lower surface of the top plate;

[0007] The auxiliary fixing mechanism includes a fixing box. A piston plate I is slidably connected inside each of the two fixing boxes. A plurality of positioning pointed cones are fixedly connected to the opposite sides of the two piston plates I. One ends of the plurality of positioning pointed cones away from the two piston plates I respectively extend to the opposite sides of the two fixing boxes.

[0008] Furthermore, a partition board is fixedly connected inside the detection box. A branch flow-through box is fixedly connected to the upper surface of the partition board. A communicating pipe is fixedly connected to the lower surface of the branch flow-through box. The bottom end of the communicating pipe extends below the partition board. A metal diaphragm is fixedly connected inside the detection box and below the partition board. An optical fiber grating body is adhesively connected to the upper surface of the metal diaphragm. Flexible conduits are symmetrically and fixedly connected to the upper surface of the branch flow-through box. The top ends of the two flexible conduits both extend above the top plate and are fixedly connected with airtight joints.

[0009] Furthermore, air boxes are fixedly connected to the lower surface inside the outer shell body and on both sides of the detection box. A sealing circular groove I is opened on the upper surface of the outer shell body and to the right of the extension opening. A rotating disc is arranged inside the sealing circular groove I. A threaded rod is fixedly connected to the center of the lower surface of the rotating disc. Connecting plates are fixedly connected to the lower left side and the lower right side of the detection box. The bottom end of the threaded rod is rotatably connected to the upper surface of the right air box through a rotating shaft. The outer side wall of the threaded rod is in threaded connection with the right connecting plate.

[0010] Furthermore, piston plates II are slidably connected to the lower parts inside the two air boxes. Connecting rods are fixedly connected to the upper surfaces of the two piston plates II. The top ends of the two connecting rods are respectively fixedly connected to the lower surfaces of the two connecting plates. Through air grooves I are opened between the opposite sides inside the two air boxes and the two fixing boxes respectively.

[0011] Furthermore, a limiting rod I is slidably connected to the outer side wall of the connecting plate on the left side inside the outer shell body. The two ends of the limiting rod I are respectively fixedly connected to the upper surface of the left air box and the upper surface inside the outer shell body.

[0012] Furthermore, a second sealing circular groove is formed in the upper surface of the outer housing and below the first sealing circular groove. A first piston circular plate is slidably connected inside the second sealing circular groove. Two return springs are fixedly connected between the lower surface of the first piston circular plate and the upper surface inside the second sealing circular groove. A fixed circular ring is fixedly connected inside the first sealing circular groove. An air groove two is formed between the fixed circular ring and the second sealing circular groove inside the fixed circular ring. An exhaust port is fixedly connected to the inner side wall of the fixed circular ring. The inner side wall of the exhaust port extends into the inside of the rotating disc. A second piston circular plate is slidably connected inside the rotating disc. A handle is fixedly connected to the upper right side of the second piston circular plate. A second limiting column is slidably connected to the outer side wall of the second piston circular plate. Two ends of the second limiting column are respectively fixedly connected to the upper surface and the lower surface inside the rotating disc.

[0013] Furthermore, sealing covers are threadedly connected above the interiors of the first sealing circular groove and the second sealing circular groove.

[0014] Furthermore, a sealing gasket is fixedly connected to the inner side wall of the extending port.

[0015] Furthermore, a maintenance door is rotatably connected to the front surface of the detection box through a hinge.

[0016] The beneficial effects of the underground fiber Bragg grating type perimeter intrusion detector of the present utility model are as follows:

[0017] By driving the rotation of the provided rotating disc, the detection box can be controlled to rise or fall, and the detection box can be extended above the outer housing. At the same time, the components inside the detector can be maintained or repaired through the provided maintenance door, without the need to dig out the whole device for disassembly, repair or maintenance, thereby improving the convenience and practicality of the device;

[0018] By setting two flexible conduits to be deformed by extrusion, the metal diaphragm is deformed by extrusion. Then, through the change of the characteristic wavelength reflected by the fiber Bragg grating body, the detection of external intrusion behavior can be realized to achieve the monitoring purpose, thereby improving the monitoring effect during the use of the intrusion detector and improving the accuracy of monitoring data;

[0019] By setting multiple positioning pointed cones, the device can be made more stable when the device is buried below the ground. When the detection box extends above the ground, the multiple positioning pointed cones are driven to retract through the driving of two connecting plates, so as to facilitate the removal of the whole device and improve the stability of the device;

[0020] By pressing the provided first piston circular plate, the handle can be extended above the rotating disc, so as to facilitate the operator to drive the threaded rod to rotate through the rotating disc, and then the detection box is extended or retracted, further improving the convenience and practicality of the device. Brief Description of the Drawings

[0021] The present utility model will be further described in detail below in conjunction with the drawings and specific implementation methods.

[0022] Figure 1 It is a schematic diagram of the overall structure of a buried fiber Bragg grating type perimeter intrusion detector of the present utility model;

[0023] Figure 2 It is a schematic diagram of the overall front sectional structure of a buried fiber Bragg grating type perimeter intrusion detector of the present utility model;

[0024] Figure 3 It is a schematic diagram of the front view of the cross-section of the rotating disk of a buried fiber Bragg grating type perimeter intrusion detector of the present utility model;

[0025] Figure 4 It is a schematic diagram of the front view of the detection box of a buried fiber Bragg grating type perimeter intrusion detector of the present utility model;

[0026] Figure 5 It is a [description of the relevant part] of a buried fiber Bragg grating type perimeter intrusion detector of the present utility model Figure 2 The enlarged structure diagram at position A;

[0027] Figure 6 It is a [description of the relevant part] of a buried fiber Bragg grating type perimeter intrusion detector of the present utility model Figure 3 The enlarged structure diagram at position B.

[0028] In the figure: 1. Outer housing; 2. Auxiliary fixing mechanism; 3. Outlet; 4. Top plate; 5. Detection box; 6. Partition; 7. Branch flow box; 8. Connecting pipe; 9. Metal diaphragm; 10. Fiber Bragg grating body; 11. Flexible conduit; 12. Sealed joint; 13. Gas box; 14. First sealing circular groove; 15. Rotating disk; 16. Threaded rod; 17. Connecting plate; 18. Second piston plate; 19. Connecting rod; 20. First gas groove; 21. First limiting rod; 22. Second sealing circular groove; 23. First piston circular plate; 24. Return spring; 25. Fixed ring; 26. Second gas groove; 27. Exhaust port; 28. Second piston circular plate; 29. Handle; 30. Second limiting column; 31. Sealing cover plate; 32. Sealing gasket; 33. Maintenance door; 201. Fixed box; 202. First piston plate; 203. Positioning pointed cone. Detailed Implementation Modes

[0029] The present utility model will be described in detail below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0030] According to one aspect of the present utility model:

[0031] As Figure 2 shown, a partition 6 is fixedly connected inside the detection box 5, a branch flow box 7 is fixedly connected to the upper surface of the partition 6, a connecting pipe 8 is fixedly connected to the lower surface of the branch flow box 7, the bottom end of the connecting pipe 8 extends below the partition 6, and a metal diaphragm 9 is fixedly connected inside the detection box 5 and below the partition 6. A fiber Bragg grating body 10 is adhesively connected to the upper surface of the metal diaphragm 9. Flexible conduits 11 are symmetrically and fixedly connected to the upper surface of the branch flow box 7. The top ends of the two flexible conduits 11 both extend above the top plate 4 and are both fixedly connected with airtight joints 12;

[0032] When the whole device is embedded below the ground surface, when a person passes through the monitored area, the two airtight joints 12 provided are squeezed to drive the two flexible conduits 11 to deform. That is, the gas passing through the two flexible conduits 11 will flow through the branch flow box 7 and into the space below the partition 6 from the branch flow box 7, causing the air pressure below the partition 6 to change. As a result, the metal diaphragm 9 is squeezed and deformed. At this time, by detecting the change in the characteristic wavelength reflected by the fiber Bragg grating body 10, the detection of external intrusion behavior can be realized to achieve the monitoring purpose, thereby improving the monitoring effect when the intrusion detector is used, avoiding the false alarm problem easily caused by point detection, and at the same time overcoming the problem that the fiber Bragg grating vibration sensor is limited in application in the buried scenario.

[0033] As Figure 1 and Figure 2 shown, a buried fiber Bragg grating type perimeter intrusion detector is provided, including a housing 1. Auxiliary fixing mechanisms 2 are fixedly connected to the lower left side and the lower right side of the housing 1 respectively. A through-type extension port 3 is opened on the inner upper surface of the housing 1. A top plate 4 is arranged above the extension port 3 on the upper surface of the housing 1. A detection box 5 is fixedly connected to the lower surface of the top plate 4;

[0034] When the device is buried below the ground surface, the detection box 5 can be effectively protected by the housing 1. The overall material of the housing 1 is corrosion-resistant and waterproof, which can better protect the whole detection box 5 and improve the service life of the components inside the detection box 5 device. At the same time, through the provided extension port 3, the detection box 5 can be extended out respectively during maintenance, so that it is not necessary to dig out the whole device for maintenance, improving the convenience and practicality of the device. Through the two provided auxiliary fixing mechanisms 2, the detector can be stably buried below the ground surface, improving the stability of the device and the accuracy of the detection result.

[0035] As Figure 2 and Figure 5 shown, a sealing gasket 32 is fixedly connected to the inner side wall of the extension port 3;

[0036] The provided sealing gasket 32 can prevent dirt or sand from entering the interior of the outer shell 1 when the detection box 5 is extended or retracted, thereby preventing the interior of the outer shell 1 from being contaminated.

[0037] like Figure 4 As shown, the front surface of the detection box 5 is connected to the inspection door 33 by a hinge;

[0038] By providing the inspection door 33 , when the detection box 5 extends out of the outer shell 1 , the operator can maintain or replace the components inside the detection box 5 , thereby ensuring the accuracy of the monitoring data and improving the overall convenience of the device.

[0039] like Figure 2 and Figure 3 As shown, the inner lower surface of the outer shell 1 and the two sides of the detection box 5 are fixedly connected with the air box 13, the upper surface of the outer shell 1 and the right side of the extension port 3 are provided with a sealing circular groove 14, a rotating disc 15 is provided inside the sealing circular groove 14, and a threaded rod 16 is fixedly connected to the center of the lower surface of the rotating disc 15. The lower left and right sides of the detection box 5 are fixedly connected with a connecting plate 17, the bottom end of the threaded rod 16 is rotatably connected to the upper surface of the right air box 13 through a rotating shaft, and the outer side wall of the threaded rod 16 is threadedly connected to the right connecting plate 17;

[0040] When the device needs to be maintained and inspected, the soil or sand above the outer shell 1 can be removed, and then the threaded rod 16 can be driven to rotate by rotating the rotating disk 15. The rotation of the threaded rod 16 drives the detection box 5 to rise through the provided connecting plate 17. After the detection box 5 is raised to a certain height, the driving of the rotating disk 15 can be stopped. After that, the monitoring components inside the detection box 5 can be maintained or replaced, which improves the convenience and practicality of the device.

[0041] like Figure 1 and Figure 2 As shown, the lower parts of the two air boxes 13 are slidably connected to piston plates 18, the upper surfaces of the two piston plates 18 are fixedly connected to connecting rods 19, the top ends of the two connecting rods 19 are fixedly connected to the lower surfaces of the two connecting plates 17, and a through-type air groove 20 is opened between the opposite sides of the interior of the two air boxes 13 and the two fixed boxes 201, and the auxiliary fixing mechanism 2 includes a fixed box 201, the interiors of the two fixed boxes 201 are slidably connected to piston plates 202, and the opposite sides of the two piston plates 202 are fixedly connected to multiple positioning cones 203, and the multiple positioning cones 203 extend away from one end of the two piston plates 202 to the opposite sides of the two fixed boxes 201 respectively;

[0042] When the detection box 5 extends out, the upward movement of the two connecting plates 17 drives the two connecting rods 19 to rise simultaneously. Then, the two connecting rods 19 drive the two second piston plates 18 to slide upward along the inside of the two air tanks 13. Thus, the air pressure generated by the sliding of the two second piston plates 18 is respectively transmitted to the inside of the two fixed boxes 201 through the two first air grooves 20. The two first piston plates 202 slide relative to each other under negative pressure, that is, the two first piston plates 202 retract the multiple positioning pointed cones 203. Thus, the auxiliary support for the device can be cancelled, and the whole device can be removed separately. When the detection box 5 retracts into the outer housing 1, the downward sliding of the two second piston plates 18 controls the multiple positioning pointed cones 203 to be inserted into the ground on both sides of the device, so that the device can be better supported by the ground during use, improving the stability of the device.

[0043] As Figure 2 shown, a first limiting rod 21 is slidably connected to the outer side wall of the connecting plate 17 on the left inside the outer housing 1. The two ends of the first limiting rod 21 are respectively fixedly connected to the upper surface of the left air tank 13 and the upper surface inside the outer housing 1.

[0044] By providing the first limiting rod 21, it can ensure that the detection box 5 can move along the vertical direction, improving the stability and reliability of the extension or retraction of the detection box 5.

[0045] As Figure 2 、 Figure 3 、 Figure 5 and Figure 6 shown, a second sealing circular groove 22 is provided on the upper surface of the outer housing 1 and below the first sealing circular groove 14. A first piston circular plate 23 is slidably connected to the inside of the second sealing circular groove 22. Two return springs 24 are fixedly connected between the lower surface of the first piston circular plate 23 and the upper surface inside the second sealing circular groove 22. An air groove 26 is provided between the inside of the first sealing circular groove 14 and the fixed circular ring 25. An exhaust port 27 is fixedly connected to the inner side wall of the fixed circular ring 25. The inner side wall of the exhaust port 27 extends into the inside of the rotating disc 15. A second piston circular plate 28 is slidably connected to the inside of the rotating disc 15. A handle 29 is fixedly connected to the upper right side of the upper surface of the second piston circular plate 28. A second limiting column 30 is slidably connected to the outer side wall of the second piston circular plate 28. The two ends of the second limiting column 30 are respectively fixedly connected to the upper surface and the lower surface inside the rotating disc 15.

[0046] Before driving the rotating disk 15 to rotate, the air pressure can be conveyed to the inside of the fixed ring 25 through the piston circular plate one 23 set by pressing downwards, and then the air pressure is conveyed to the inside of the rotating disk 15 through the fixed ring 25 and the exhaust port 27. Then, the piston circular plate two 28 is pushed up and slides under the extrusion of the air pressure, so that the control grip 29 is driven to extend by the piston circular plate two 28. This makes it more convenient for the operator to drive the rotating disk 15 to rotate to extend or retract the detection box 5, thereby improving the practicability of the device. At the same time, the limit post two 30 can facilitate the rotation of the rotating disk 15 driven by the grip 29, preventing the piston circular plate two 28 from rotating inside the rotating disk 15, which may cause the lower threaded rod 16 not to rotate. When the grip 29 is released, the piston circular plate one 23 is reset by the elastic potential energy of the two reset springs 24 set, that is, the grip 29 is retracted back into the rotating disk 15 by the piston circular plate one 23, which is convenient for the next use.

[0047] As Figure 1 and Figure 5 shown, sealing cover plates 31 are threadedly connected to the upper parts inside the sealing circular groove one 14 and the sealing circular groove two 22 respectively;

[0048] By setting the two sealing cover plates 31, when the device is buried underground, it can effectively prevent soil or sand particles from entering the inside of the sealing circular groove one 14 and the sealing circular groove two 22, improving the stability of the internal transmission of the sealing circular groove one 14 and the sealing circular groove two 22.

[0049] All electrical components mentioned in this article are electrical components that exist in reality.

[0050] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions, or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention also belong to the protection scope of the present invention.

Claims

1. A buried fiber Bragg grating type perimeter intrusion detector, comprising an outer housing (1), characterized in that: Auxiliary fixing mechanisms (2) are fixedly connected to both the lower left side and the lower right side of the outer housing (1). A through-type extension opening (3) is provided on the upper surface inside the outer housing (1). A top plate (4) is provided on the upper surface of the outer housing (1) and above the extension opening (3). A detection box (5) is fixedly connected to the lower surface of the top plate (4). The auxiliary fixing mechanism (2) includes a fixing box (201). Inside both of the fixing boxes (201), a first piston plate (202) is slidably connected. On the opposite sides of both of the first piston plates (202), a plurality of positioning pointed cones (203) are fixedly connected. One ends of the plurality of positioning pointed cones (203) away from both of the first piston plates (202) respectively extend to the opposite sides of both of the fixing boxes (201).

2. The perimeter intrusion detector of the buried fiber grating type according to claim 1, characterized in that: A partition plate (6) is fixedly connected inside the detection box (5). A branch flow-through box (7) is fixedly connected to the upper surface of the partition plate (6). A connecting pipe (8) is fixedly connected to the lower surface of the branch flow-through box (7). The bottom end of the connecting pipe (8) extends below the partition plate (6). A metal diaphragm (9) is fixedly connected inside the detection box (5) and below the partition plate (6). An optical fiber grating body (10) is adhesively connected to the upper surface of the metal diaphragm (9). Flexible conduits (11) are symmetrically fixedly connected to the upper surface of the branch flow-through box (7). The top ends of both of the flexible conduits (11) extend above the top plate (4) and are both fixedly connected to a sealed joint (12).

3. The perimeter intrusion detector of the buried fiber grating type according to claim 1, characterized in that: Gas boxes (13) are fixedly connected to both sides of the detection box (5) on the lower surface inside the outer housing (1). A first sealed circular groove (14) is provided on the upper surface of the outer housing (1) and to the right of the extension opening (3). A rotating disc (15) is arranged inside the first sealed circular groove (14). A threaded rod (16) is fixedly connected to the center of the lower surface of the rotating disc (15). Connecting plates (17) are fixedly connected to both the lower left side and the lower right side of the detection box (5). The bottom end of the threaded rod (16) is rotatably connected to the upper surface of the right gas box (13) through a rotating shaft. The outer sidewall of the threaded rod (16) is threadedly connected to the right connecting plate (17).

4. The buried fiber Bragg grating type perimeter intrusion detector according to claim 3, characterized in that: Second piston plates (18) are slidably connected to the lower parts inside both of the gas boxes (13). Connecting rods (19) are fixedly connected to the upper surfaces of both of the second piston plates (18). The top ends of both of the connecting rods (19) are respectively fixedly connected to the lower surfaces of both of the connecting plates (17). Through-type first air grooves (20) are provided between the opposite sides inside both of the gas boxes (13) and both of the fixing boxes (201).

5. The buried fiber grating type perimeter intrusion detector according to claim 3, characterized in that: A first limiting rod (21) is slidably connected to the outer sidewall of the connecting plate (17) on the left side inside the outer housing (1). The two ends of the first limiting rod (21) are respectively fixedly connected to the upper surface of the left gas box (13) and the upper surface inside the outer housing (1).

6. The buried fiber Bragg grating type perimeter intrusion detector according to claim 3, characterized in that: On the upper surface of the outer housing (1) and below the first sealing circular groove (14), a second sealing circular groove (22) is provided. A first piston circular plate (23) is slidably connected inside the second sealing circular groove (22). Two return springs (24) are fixedly connected between the lower surface of the first piston circular plate (23) and the upper inner surface of the second sealing circular groove (22). A fixed circular ring (25) is fixedly connected inside the first sealing circular groove (14). An air groove two (26) is provided between the fixed circular ring (25) and the second sealing circular groove (22) inside. An exhaust port (27) is fixedly connected to the inner side wall of the fixed circular ring (25). The inner side wall of the exhaust port (27) extends into the inside of the rotating disc (15). A second piston circular plate (28) is slidably connected inside the rotating disc (15). A handle (29) is fixedly connected to the upper surface on the right side of the second piston circular plate (28). A second limiting column (30) is slidably connected to the outer side wall of the second piston circular plate (28). The two ends of the second limiting column (30) are respectively fixedly connected to the upper inner surface and the lower inner surface of the rotating disc (15).

7. The buried fiber Bragg grating type perimeter intrusion detector according to claim 6, characterized in that: Sealing covers (31) are threadedly connected above the interiors of the first sealing circular groove (14) and the second sealing circular groove (22).

8. The buried fiber Bragg grating type perimeter intrusion detector according to claim 1, characterized in that: A sealing gasket (32) is fixedly connected to the inner side wall of the outlet (3).

9. The perimeter intrusion detector of the buried fiber grating type according to claim 1, characterized in that: A maintenance door (33) is rotatably connected to the front surface of the detection box (5) by a hinge.

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