Surge protection device for bridge monitoring sensor

Abstract

The utility model relates to the technical field of bridge sensor protection, in particular to a surge protection device for a bridge monitoring sensor, which comprises a box body, an input end, an output end and a grounding end are arranged on the box body, an opening is formed in the top of the box body, and a box cover is arranged at the top of the box body. The bottom surface of the box cover is in concave-convex fit with the top surface of the box body, a sealing ring is arranged on the concave-convex fit surface, and the box cover is detachably connected with the box body; the bottom of the box body is connected with a steel plate, the plane area of the steel plate is larger than that of the box body, the steel plate is provided with a grounding pole and a plurality of mounting holes, and the grounding pole is connected with the grounding end. According to the utility model, waterproof design and lightning protection measures are carried out on the housing of the surge protection device for the field environment where a bridge is exposed outdoors and grounding is difficult, so that the stability and durability of an internal circuit of the surge protection device can be improved, the damage risk of an internal circuit chip can be reduced, and the surge protection effect can be brought into full play.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge sensor protection technical field, especially in a kind of surge protection device for bridge monitoring sensor. BACKGROUND

[0002] In highway bridge structure health monitoring system, sensor (such as strain gauge, displacement sensor etc.) is usually deployed in bridge deck lower part or pier, for real-time acquisition vibration, deformation and other key data.Sensor usually carries out data transmission by 485 bus, and the anti-surge ability of 485 communication chip is weak, although the probability of being damaged by direct lightning is lower, but it is extremely vulnerable to induced lightning and damage.

[0003] To improve the anti-surge ability of sensor equipment, reduce damage risk, surge protector is usually connected in bridge sensor equipment line, to carry out lightning protection and remote on-line monitoring to bridge sensor.But due to the fact that ground device is not reserved when field bridge is built, and it is difficult to add grounding grid later, surge protector exists poor grounding condition, which will lead to lightning surge cannot be effectively discharged, reduces surge protection effect.In addition, since bridge monitoring equipment is exposed to outdoor for a long time, faces rainwater erosion, humidity change and other environmental challenges, conventional surge protector (SPD) adopts ordinary metal shell, and the waterproof performance is insufficient, difficult to adapt to bridge special environment, easy to lead to internal circuit damp failure.

[0004] Therefore, a surge protection device with high waterproofness and adapting to bridge grounding difficult environment is urgently needed. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the problems of poor grounding and internal circuit damp failure of existing surge protection device, and provides a surge protection device for bridge monitoring sensor.

[0006] The utility model provides a surge protection device for bridge monitoring sensor, including box body, input end, output end and ground terminal are equipped on the box body, the top of the box body is open, the top of the box body is equipped with box cover, the bottom surface of box cover is matched with the top surface of box body and is equipped with sealing ring at concave-convex cooperation surface, and box cover is detachably connected with box body;The bottom of the box body is connected with steel plate, the plane area of steel plate is greater than the plane area of box body, the steel plate is equipped with grounding column and a plurality of mounting holes, and the grounding column is connected with ground terminal.

[0007] Preferably, a plurality of support columns are arranged in the box body, screw holes are arranged on the support columns, and the support columns are used for mounting first circuit board.

[0008] Preferably, the surge protection device further comprises an isolation plate, a plurality of legs are arranged on the isolation plate, and the legs are fixedly connected with the first circuit board.

[0009] Preferably, the surge protection device further comprises a stud, one end of the stud is connected with the threaded hole or the first circuit board, the other end of the stud extends beyond the isolation plate and is connected with the second circuit board through a screw.

[0010] Preferably, the steel plate is connected with the pier reinforcement through an expansion screw.

[0011] Preferably, the box body and the box cover are connected through a bolt, and the bolt is vertically arranged along the height direction of the side wall of the box cover.

[0012] Preferably, the inner side wall of the box cover protrudes from the inner side wall of the box body, and the inner side wall of the box cover downwardly extends towards the box body and is arranged in a superimposed manner with the inner side wall of the box body.

[0013] Preferably, the outer side wall of the box body is arranged in a flush manner with the outer side wall of the box cover.

[0014] Preferably, the bottom surface of the box body is provided with a waterproof and breathable film.

[0015] Preferably, the box cover adopts an open mold plastic shell.

[0016] Compared with the prior art, the surge protection device for the bridge monitoring sensor has the following beneficial effects:

[0017] The utility model provides a kind of surge protection device for bridge monitoring sensor, for bridge exposure in outdoor and grounding difficult field environment, the shell of surge protection device is designed and lightning protection measure, to facilitate the stability and durability of the internal circuit of surge protection device, reduce internal circuit chip damage risk, give full play to surge protection effect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a partial sectional plan view of the surge protection device for the bridge monitoring sensor in embodiment 1;

[0019] Figure 2 It is A-A sectional view in Figure 1

[0020] Figure 3 It is a partial enlarged view of Figure 2

[0021] Figure 4 It is front view of Figure 1 ​​​

[0022] Reference signs in the drawings:

[0023] 1 - box body; 11 - input end; 12 - output end; 13 - grounding end; 14 - support column; 2 - box cover; 3 - steel plate; 31 - grounding column; 32 - mounting hole; 4 - sealing ring; 5 - first circuit board; 6 - second circuit board; 7 - isolation plate; 71 - leg; 8 - stud; 9 - screw; 10 - waterproof and breathable membrane. DETAILED DESCRIPTION

[0024] The utility model will be described in further detail below in combination with specific embodiments. However, this should not be understood as limiting the scope of the above-mentioned subject matter of the utility model to the following embodiments only, and any technology realized based on the content of the utility model falls within the scope of the utility model.

[0025] In the description of the specific embodiments of the utility model, the terms expressing the orientation or positional relationship of "up", "down", "left", "right", "center", "inner", "outer", etc. are based on the orientation or positional relationship expressed in the drawings, or the orientation or positional relationship used when the product / equipment / device of the utility model is normally used. These terms of orientation or positional relationship are only used to facilitate the description of the utility model scheme or simplify the description in the specific embodiments, so as to enable the skilled person to quickly understand the scheme, and therefore cannot be understood as limiting the utility model to a specific device / component / element having a specific orientation or being constructed and operated in a specific positional relationship.

[0026] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel", etc. appear, it does not mean that the corresponding device / component / element must be absolutely horizontal or vertical or overhanging or parallel, but can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Alternatively, it can be simplified to mean that the corresponding device / component / element is arranged in the direction of "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction, more preferably an error / deviation of ±8% or less, more preferably an error / deviation of ±6% or less, more preferably an error / deviation of ±5% or less, and more preferably an error / deviation of ±4% or less. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the utility model.

[0027] In addition, the terms "first", "second", "third", etc. appearing in the terms are only used to distinguish the description of the same or similar parts, and should not be understood as emphasizing or implying the relative importance of the specific parts.

[0028] Further, in the description of the embodiments of the utility model, "several" "a plurality of" "several" represents at least 2. Can be 2, 3, 4, 5, 6, 7, 8, 9 etc. Any situation, it can even be more than 9 cases.

[0029] Further, in the description of the technical scheme of the utility model, unless otherwise explicitly specified / limited / limited, the place where the term "set" "installation" "connected" "connected" "provided with" "laid" "arranged" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, which can be welding, riveting, bolting, screwing and other commonly used connecting means in the art. The connection can be mechanical connection, electrical connection or communication connection, can be directly connected, or indirectly connected through an intermediate medium, can be the communication between two elements.

[0030] Embodiments

[0031] As Figures 1-4 The utility model discloses a surge protection device for bridge monitoring sensor, including box body 1, box cover 2 and steel sheet 3.

[0032] Box body 1 is used to install internal circuit, and box body 1 is equipped with input end 11, output end 12 and ground terminal 13, and the top of box body 1 is open, and the top of box body 1 is detachably connected with box cover 2, which is convenient for installation and maintenance while adapting bridge vibration. At the same time, the bottom surface of box cover 2 and the top surface of box body 1 are arranged in concave-convex matching mode, and a sealing ring 4 is arranged at the concave-convex matching surface, the water vapor penetration path is prolonged, the water vapor can be effectively isolated, the rainwater is prevented from penetrating, and the risk of internal circuit failure due to dampness is reduced. The input end 11, the output end 12 and the ground terminal 13 all adopt waterproof adapters, the input end 11 and the output end 12 are used to be connected with external equipment lines, and the ground terminal 13 is used for internal circuit grounding.

[0033] The box body 1 and the box cover 2 are preferably bolted, and the bolts are vertically arranged along the height direction of the side wall of the box cover 2, avoiding the opening of the side wall of the box body 1 and the box cover 2, and the waterproof performance is better. Preferably, the bolts are arranged outside the sealing ring 4 to improve the waterproof performance.

[0034] In one or more embodiments, the inner side wall of the box cover 2 is arranged protruding from the inner side wall of the box body 1, and the inner side wall of the box cover 2 extends downward and is arranged in superposition with the inner side wall of the box body 1, so that the box cover 2 can be quickly positioned to prevent mispositioning with the box body 1, and the installation is convenient. Preferably, the outer side wall of the box body 1 is arranged flush with the outer side wall of the box cover 2, and the transition at the connection position is smooth. The wall thickness of the box cover 2 is greater than the wall thickness of the box body 1.

[0035] In an optional embodiment, as Figure 3As shown, a protrusion is arranged at the top of the box body 1, the protrusion is formed with an L-shaped notch near one side of the outer side wall, the outer side is lower than the inner side, and the cross section is stepped; a groove corresponding to the protrusion is arranged at the bottom of the box cover 2, one side of the groove is coincided with the inner side wall of the box body 1, and the sealing ring 4 is preferably an annular member with an Ω-shaped cross section. Under the action of the tightening of the bolts, the box cover 2 is tightly attached to the box body 1 and is circumferentially sealed by the sealing ring 4, rainwater is not easy to penetrate from the L-shaped notch to the inside of the box body 1, and the waterproof performance is good; and the bolts are quickly positioned.

[0036] The steel plate 3 is integrally arranged at the bottom of the box body 1, and the box body 1 and the steel plate 3 can be connected integrally by welding or threaded connection. In an optional embodiment, the box body 1 includes a bottom plate, the bottom plate extends beyond the side wall from the left and right ends to form an extension plate, and a fixing hole is arranged on the extension plate for fixed connection with the steel plate 3.

[0037] In this embodiment, the planar area of the steel plate 3 is larger than the planar area of the box body 1, the steel plate 3 extends beyond the peripheral edge of the box body 1, and the steel plate 3 is provided with a grounding column 31 and a plurality of mounting holes 32, the grounding column 31 is connected with the grounding end 13 on the box body 1, and the mounting holes 32 are used for punching expansion screws to be connected with the bridge. By grounding through the steel plate 3, the contact area of the box body 1 with the bridge concrete is increased, low-impedance grounding can be achieved without deep embedding of the grounding electrode, and the problem of high bridge grounding resistance is overcome.

[0038] In this embodiment, during the installation of the bridge on site, the grounding steel plate is preferably effectively connected with the internal reinforcement of the pier through expansion screws, the natural grounding body is fully utilized, the purpose of effective grounding for lightning current discharge is achieved, and the grounding reliability is ensured.

[0039] Further, in an optional embodiment, the box cover 2 adopts an open mold plastic shell, which is light in quality, resistant to salt spray, and has good flame retardance and ultraviolet resistance.

[0040] In an optional embodiment, a waterproof and breathable film 10 is arranged in the box body 1, which is used for balancing the air pressure inside and outside the shell and blocking the penetration of liquid water, so as to avoid the phenomenon that the condensation water in the box body 1 caused by temperature change or humidity penetration corrodes the circuit.

[0041] In one or more embodiments, a plurality of support columns 14 are arranged at the bottom of the box body 1, and the support columns 14 are provided with screw holes, and the support columns 14 are used to mount the first circuit board 5. Preferably, two columns of three support columns 14 are arranged, and the two columns of three support columns 14 are fixedly connected to the two sides of the first circuit board 5, so that the mounting is more stable, the specific circuit arrangement is not affected, and the mounting adaptability is better. By suspending the first circuit board 5 supported and fixed on the support columns 14, the first circuit board 5 is not in direct contact with the wall surface of the box body 1, which is beneficial to reducing the risk of corrosion of the circuit caused by condensation water in the box body 1, improving the waterproof performance, and better adapting to the vibration working condition of the bridge, thereby reducing the risk of failure of the internal circuit.

[0042] Further, the surge protection device further comprises an isolation plate 7 and a stud 8. The isolation plate 7 is used to isolate the two circuit boards arranged in a stacked manner, so as to reduce electromagnetic interference. The stud 8 is used to support the second circuit board 6 arranged above the first circuit board 5, so as to avoid the direct contact between the second circuit board 6 and the isolation plate 7. Specifically, the isolation plate 7 is provided with a plurality of support legs 71, the bottom of each support leg 71 is bent to form a bent portion, and the bent portion is provided with a through hole for fixedly connecting with the first circuit board 5. The isolation plate 7 is supported and fixed above the first circuit board 5 by the support legs 71.

[0043] The stud 8 is connected with the screw hole and / or the first circuit board 5. The stud 8 is a stepped shaft, the smaller end of the bottom of the stud 8 can be fixed by a nut or threadedly connected with the screw hole after penetrating through the first circuit board 5. The top of the stud 8 extends beyond the height position of the isolation plate 7. The top of the stud 8 is provided with an internal thread. The second circuit board 6 is supported on each stud 8, and the stud 8 is fixedly connected with the second circuit board 6 by a screw 9. Preferably, the support leg 71 of the isolation plate 7 is arranged corresponding to the mounting position of the stud 8, so that the stud 8 penetrates through the through hole of the support leg 71 to be fixed together.

[0044] In an optional embodiment, the first circuit board 5 can be a lightning protection board used to limit the voltage and receive the surge signal. The second circuit board 6 can be a monitoring board used to analyze and record the surge data according to the surge signal, and monitor the working state of the lightning protection board, so that the surge protection device integrates lightning protection and intelligent monitoring, effectively obtains the surge occurrence and surge parameters of the protected line, and performs surge warning to timely inform the user, thereby providing effective support for subsequent improvement of lightning protection facilities.

[0045] In the above scheme, in view of the fact that the bridge is exposed to outdoor and difficult-to-ground site environment, a series of waterproof design and lightning protection measures are taken for the shell of the surge protection device, so as to improve the stability and durability of the internal circuit of the surge protection device, reduce the risk of damage to the internal circuit chip, and fully play the surge protection effect.

[0046] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A surge protection device for a bridge monitoring sensor, characterized in that: The invention comprises a box body (1), wherein the box body (1) is provided with an input terminal (11), an output terminal (12) and a ground terminal (13), the top of the box body (1) is open, and a box cover (2) is provided on the top of the box body (1), the bottom surface of the box cover (2) is concavely matched with the top surface of the box body (1), and a sealing ring (4) is provided at the concave-convex matching surface, and the box cover (2) is detachably connected to the box body (1); the bottom of the box body (1) is connected to a steel plate (3), the plane area of ​​the steel plate (3) is larger than the plane area of ​​the box body (1), and the steel plate (3) is provided with a grounding column (31) and a plurality of mounting holes (32), and the grounding column (31) is connected to the ground terminal (13).

2. The surge protection device according to claim 1, characterized in that: A plurality of support columns (14) are provided in the box body (1), screw holes are provided on the support columns (14), and the support columns (14) are used to install the first circuit board (5).

3. The surge protection device according to claim 2, characterized in that: It also includes an isolation plate (7), wherein the isolation plate (7) is provided with a plurality of supporting legs (71), and the supporting legs (71) are fixedly connected to the first circuit board (5).

4. The surge protection device according to claim 3, characterized in that: It also includes a stud (8), one end of which is fixedly connected to the screw hole or the first circuit board (5), and the other end of which extends beyond the isolation plate (7) and is connected to the second circuit board (6) via a screw (9).

5. The surge protection device according to claim 1, characterized in that: The steel plate (3) is connected to the pier reinforcement via expansion screws.

6. The surge protection device according to claim 1, characterized in that: The box body (1) and the box cover (2) are connected by bolts, and the bolts are vertically arranged along the height direction of the side wall of the box cover (2).

7. The surge protection device according to claim 1, characterized in that: The inner side wall of the box cover (2) protrudes from the inner side wall of the box body (1), and the inner side wall of the box cover (2) extends downward toward the side where the box body (1) is located so as to overlap with the inner side wall of the box body (1).

8. The surge protection device according to any one of claims 1 to 7, characterized in that: The outer side wall of the box body (1) is flush with the outer side wall of the box cover (2).

9. The surge protection device according to any one of claims 1 to 7, characterized in that: The bottom surface of the box body (1) is provided with a waterproof and breathable membrane (10).

10. The surge protection device according to any one of claims 1 to 7, characterized in that: The box cover (2) adopts an open-mold plastic shell.

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