NL2030949B1

NL2030949B1 - Bridge detector

Info

Publication number: NL2030949B1
Application number: NL2030949A
Authority: NL
Inventors: Niu Shaohua; Ge Jieyou; Sui Li; Zhan Gan
Original assignee: Beijing Institute Tech
Priority date: 2022-02-15
Filing date: 2022-02-15
Publication date: 2023-08-21

Abstract

The present disclosure discloses a bridge detector, which comprises a bridge disease detection system, an electric control module, a pneumatic rod and a box body, wherein the bridge disease detection system is installed at the top of the pneumatic rod, and the pneumatic rod is in control connection with the electric control module; the pneumatic rod is suspended and rotatably installed, above the box body; both ends of the pneumatic rod rotate around the middle of the pneumatic rod; after the pneumatic rod rotates, the pneumatic rod is suspended on or perpendicular to the box body. The bridge detector can replace the detection such as manual observation, large bridge detection vehicles or supporting frames during the daily inspection or special inspection of urban roads and bridges.

Description

P1098 /NLpd

BRIDGE DETECTOR

TECHNICAL FIELD

The present disclosure relates to a bridge detector, belong- ing to the field of bridge detection devices.

BACKGROUND ART

At present, the commonly used bridge detection in China com- prises: (1) remote observation by artificial telescopes; (2) erecting a support frame or erecting a frame on a ship for close maintenance; (3) using a large bridge detector for close mainte- nance. The main problems of the above methods are as follows: (1) the detection methods are backward and the mobility is poor; (2) the cost is high and the time consumption is long; (3) it is dif- ficult to transport devices and the traffic impact is great; (4) in the process of detection, the safety is poor; (5) the detection range is limited, etc. In view of the above problems and engineer- ing practice, it is urgent to develop a new bridge detector, which is portable, fast, safe and efficient to enter the working posi- tion, and can capture and detect bridge cracks, supporting frame damage and other diseases in real time with high quality and com- prehensively, and complete the bridge detection work quickly and safely.

SUMMARY

According to one aspect of the present disclosure, a bridge detector is provided, which can conveniently and quickly detect defects such as bridge diseases and has high operating efficiency.

The bridge detector comprises a bridge disease detection sys- tem, an electric control module, a pneumatic rod and a box body, wherein the bridge disease detection system is installed at the top of the pneumatic rod, and the pneumatic rod is in control con- nection with the electric control module. the pneumatic rod is suspended and rotatably installed above the box body;

both ends of the pneumatic rod rotate around the middle of the pneumatic rod; after the pneumatic rod rotates, the pneumatic rod is sus- pended on or perpendicular to the box body.

Preferably, the bridge detector comprises a rotating shaft bracket, and the middle of the pneumatic rod is rotatably in- stalled on the rotating shaft bracket.

Preferably, the bridge detector comprises: a rotating shaft bracket and a rotating shaft, the rotating shaft bracket is fixed- ly installed on the box body and extends above the box body to form a free end; both ends of the rotating shaft are installed on the free end of the rotating shaft bracket, respectively; the middle of the pneumatic rod is rotatably installed in the middle of the rotating shaft.

Preferably, the bridge detector comprises a leg fixing plate and a plurality of mechanical legs, the leg fixing plate is sleeved and fixed on the upper part of the pneumatic rod; one end of the mechanical leg is connected with the leg fix- ing plate, and the other end thereof is movably abutted against the ground.

Preferably, the mechanical leg is a telescopic rod; one end of the mechanical leg is rotatably connected with the periphery of the leg fixing plate, and the mechanical leg rotates around the leg fixing plate.

Preferably, the bridge detector further comprises: a detector body armrest frame; the detector body armrest frame comprises an armrest and side beams; the side beams are provided on two opposite side walls of the box body in pairs and extend outwards from the box body at an acute angle with the box body, and the middle of the side beams is connected with the rotating shaft bracket; the armrest is installed at one end of the side beam.

Preferably, the bridge detector further comprises: a first hoop and a second hoop, the first hoop is provided on the top sur- face of the box body, and the second hoop is provided on the arm-

rest.

Preferably, the box body comprises an operation panel, a first wheel and a second wheel, the first wheel is a guide wheel and is provided at the front end of the bottom surface of the box body; the second wheels are provided at the rear of the bottom sur- face of the box body in pairs; the top surface of the box body is provided with the opera- tion panel.

Preferably, the bridge disease detection system comprises a ball camera shooting module and a signal receiving and transmit- ting module; the bridge detector further comprises a power supply module; the ball camera shooting module is in signal connection with the signal receiving and transmitting module; the electric control module and the power supply module are both provided in the box body, and the electric control module is in signal connection with the signal receiving and transmitting module; the power supply module is in power supply connection with the bridge disease detection system.

Preferably, the bridge detection system further comprises a display module and a storage module, and the signal receiving and transmitting module is in signal connection with the display mod- ule and the storage module, respectively.

The beneficial effects of the present disclosure include, but are not limited to: (1) The bridge detector according to the present disclosure is mainly used for daily detection of bridge diseases, especially for rapid detection of urban field bridge diseases with a height of 2 to 8 meters. A new turnover telescopic mechanism of the de- vice is used to achieve structural innovation. The device can quickly and effectively detect bridge diseases with a height of 2 to 8 meters with the advantages of portability, convenient opera- tion, high detection accuracy and so on, which improves the effi- ciency of daily detection of bridge diseases. (2) The bridge detector according to the present disclosure integrates many technologies such as mechanics, electronics, video processing, data acquisition and transmission and software appli- cation, and has a series of advantages such as flexible installa- tion, light weight, convenient operation, etc., and can effective- ly detect diseases such as bridge damage in a long-term, real-time manner. This device works flexibly and can effectively adapt to the external working environment, so as to quickly and effectively detect related diseases and defects such as bridge cracks and sup- porting frame damage. {3) The bridge detector according to the present disclosure can replace the detection such as manual observation, large bridge detection vehicles or supporting frames during the daily inspec- tion or special inspection of urban roads and bridges. This device is a newly developed bridge disease detector with the advantages of portability, convenient operation, high detection accuracy and so on, which improves the efficiency of daily detection of bridge diseases.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is the main schematic diagram of the first state of a bridge detector according to the present disclosure.

FIG. 2 is a schematic left side view of the first state of a bridge detector according to the present disclosure.

FIG. 3 is a schematic plan view of the first state of a bridge detector according to the present disclosure.

FIG. 4 is a schematic front view of the second state of a bridge detector according to the present disclosure.

FIG. 5 is a schematic plan view of the second state of a bridge detector according to the present disclosure.

FIG. 6 is a schematic left side view of the second state of a bridge detector according to the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present disclosure will be described in detail in con-

Junction with embodiments hereinafter, but the present disclosure is not limited to these embodiments.

Referring to FIG. 1, the bridge detector according to the present disclosure comprises a bridge disease detection system 600, an electric control module, a pneumatic rod 510 and a box body 110, wherein the bridge disease detection system 600 is in- stalled at the top of the pneumatic rod 510, and the pneumatic rod 5 510 is in control connection with the electric control module; the pneumatic rod 510 is suspended and rotatably installed above the box body 110; both ends of the pneumatic rod 510 rotate around the middle of the pneumatic rod; after the pneumatic rod 510 rotates, the pneumatic rod 510 is suspended on or perpendicular to the box body 110.

The bridge detector according to the present disclosure is small in size and fast in movement, and is convenient to move as required for detection. In the present disclosure, suspension means that this part is not in direct contact with the box body 110, but is fixed in contact with the box body 110 through other components. The electric control system comprises various electric and control devices needed for bridge detection in the prior art.

Referring to FIG. 1, the bridge detector according to the present disclosure comprises a bridge disease detection system 600, a pneumatic rod 510 and a box body 110, wherein the bridge disease detection system 600 is installed at the top of the pneu- matic rod 510. The middle of the pneumatic rod 510 is suspended and rotatably installed on the box body 110. Both ends of the pneumatic rod 510 rotate around the middle of the pneumatic rod.

After the pneumatic rod 510 is rotated to the designated position, the pneumatic rod is fixed to the first state and the second state, respectively. The first state and the second state are used as required, respectively. For example, in the first state, as shown in FIGS. 1 to 3, the pneumatic rod 510 is perpendicular to the box body 110. The bottom end of the pneumatic rod 510 is fixed to the box body 110. In the first state, the box body 110 can pro- vide support for the pneumatic rod 510 during disease detection.

At the same time, wheels are provided on the bottom surface of the box body 110, which is convenient to move integrally as required.

Preferably, one end of the box body 110 is provided with a bracket perpendicular to the box body, and a hoop is installed on the bracket. When the pneumatic rod 510 needs to be in the second state, referring to FIGS. 4 to 6, the bottom end of the pneumatic rod 510 is fixed in the hoop.

In an embodiment, referring to FIG. 2, a horizontal adjusting leg 140 is further provided on the ground of the box body 110.

When the box body 110 is in a static state, the box body is used to adjust the levelness of an orthodox device in the working state, which also increases the supporting points of the whole de- vice at the same time to ensure the stability of the pneumatic rod 510.

The pneumatic rod 510 installed on the detector is used to install and fix the bridge disease detection system 600 and lift the system to a suitable detection height. The design parameters of the pneumatic rod 510 are as follows: the lifting height range is 2m to 8m with a high self-locking function; the maximum outline diameter of the pneumatic rod 510 is 160mm, the diameter of the turnover joint is 85mm, the maximum vertical load is about 15kg, and the self-weight of the rod is about 10kg. The lifting of the pneumatic rod 510 is controlled by a pneumatic circuit system, which is connected with a PC, a mobile phone or a client through wireless routing and controlled by a dedicated interface of the

PC, the mobile phone or the client to realize the lifting of the pneumatic rod 510.

Preferably, the bridge detector comprises a rotating shaft bracket 410, and the middle of the pneumatic rod 510 is rotatably installed on the rotating shaft bracket 410.

Preferably, the bridge detector comprises a rotating shaft bracket 410 and a rotating shaft 420, wherein the rotating shaft bracket 410 is fixedly installed on the box body 110 and extends above the box body 110 to form a free end; both ends of the rotat- ing shaft 420 are installed on the free end of the rotating shaft bracket 410, respectively; the middle of the pneumatic rod 510 is rotatably installed in the middle of the rotating shaft 420. More preferably, the rotating shaft bracket 410 extends upward perpen- dicular to the box body 110, and according to this arrangement, the overall volume of the detector can be reduced.

Referring to FIGS. 1-2, the bridge detector further comprises a rotating shaft bracket 410 and a rotating shaft 420. The rotat- ing shaft bracket 410 comprises a first rod of the rotating shaft bracket 410 and a second rod of the rotating shaft bracket 410.

One end of the first rod of the rotating shaft bracket 410 is fixed on the outer side wall of the box body 110, and the other end thereof is fixed with one end of the rotating shaft 420. One end of the second rod of the rotating shaft bracket 410 is fixed on the outer side wall of the box body 110, and is aligned with the first rod of the rotating shaft bracket 410, and the other end of the second rod of the rotating shaft bracket 410 is fixed with the other end of the rotating shaft 420. The pneumatic rod 510 is rotatably connected to the rotating shaft 420 around the rotating shaft 420. The middle in the present disclosure does not specifi- cally refer to the middle symmetry point, but generally refers to the area near the middle symmetry point.

Preferably, the bridge detector further comprises a detector body armrest frame, the detector body armrest frame comprises an armrest 340 and side beams; the side beams are provided on two op- posite side walls of the box body 110 in pairs and extend outward from the box body 110 at an acute angle with the box body 110, and the middle of the side beams is connected with the rotating shaft bracket 410; the armrest 340 is installed at one end of the side beam.

Preferably, the bridge detector further comprises a first hoop 330 and a second hoop 120, wherein the first hoop 330 is pro- vided on the top surface of the box body 110; and the second hoop 120 is provided on the detector body armrest frame.

Referring to FIGS. 1-3, the detector body armrest frame is installed on the box body 110. The detector body armrest frame comprises a first side beam 310 and a second side beam 320 provid- ed in pairs. One end of the first side beam 310 is fixedly con- nected to the bottom surface of one end of the box body 110, and the other end is provided with an armrest 340. The other first side beam 310 of the paired first side beams 310 is installed on the other side of the box body 110, and the installation method is the same as above, which will not be described here. The first end of the second side beam 320 is fixedly connected to the bottom surface of the other end of the box body 110. The second end of the second side beam 320 is slidably connected along the first side beam 310. An installing member is provided on the second end of the second side beam 320. After the second end of the second side beam 320 slides to the preset position of the first side beam 310, the second end of the second side beam 320 is fixed by the fixing member. The other second side beam 320 of the paired second side beams 320 is installed on the other side of the box body 110, and the installation method is the same as above, which will not be described here. Both ends of the armrest 340 are installed at the free ends of the paired first side beams 310, respectively.

The first hoops 330 are also installed at the free ends of the paired first side beams 310. The first hoops 330 are installed on the installing rods, and both ends of the installing rods are in- stalled at the free ends of the paired first side beams 310, re- spectively.

In another embodiment, the installing member provided on the second end of the second side beam 320 fixedly connects the first side beam 310, the second side beam 320 and the rotating shaft bracket 410. The detector body armrest frame is used to push and pull a trolley, which is convenient for manual operation and transportation and also plays the role of fixing the rotating shaft bracket 410.

Referring to FIGS. 1 to 2, the wheel comprises a first wheel 210 and a second wheel 220. The first wheel 210 is provided at the front end of the bottom surface of the box body 110. The first wheel 210 is a guide wheel that can control the forward direction of the box body 110. The second wheels are provided at the rear end of the bottom surface of the box body 110 in pairs to play a supporting role.

Referring to FIGS. 1 and 3, an operation panel 130 is provid- ed at the front end of the top surface of the box body 110. The operation panel 130 is embedded with the control system buttons, power buttons, indicator lights and other components of the whole device.

The portable carrier vehicle is a wheeled cart with three- point support. The front support point of the box body 110 is a single point support, which uses two eccentric axle universal wheels coaxially fixed for the steering of the vehicle body. The rear of the box body 110 is supported by two points and is sup- ported using fixed casters, respectively. The portable carrier ve- hicle is equipped with four horizontal adjusting legs 140 to level the bridge detector, which can increase the floor area of the trolley and ensure the working stability of the pneumatic rod 510.

At the same time, combined with a level meter provided on the de- tector operation panel 130, the detection efficiency of the device can be improved. The electric control system is installed in the detector box body 110, and the carrier cart is provided with a turnover fixing hoop device for fixing the pneumatic rod 510 in the transportation and working state of the pneumatic rod 510.

Referring to FIG. 2, the hoop comprises a first hoop 330 and a second hoop 120. The first hoop 330 is provided on the detector body armrest frame. The second hoop 120 is provided on the top surface of the box body 110; the bottom end of the pneumatic rod 510 is fixed to the first hoop 330 or the second hoop 120, respec- tively. Specifically, the first hoop 330 is provided at the middle of the lower part of the armrest.

Preferably, the bridge detector comprises a leg fixing plate 530 and a plurality of mechanical legs 520, wherein the leg fixing plate 530 is sleeved and fixed on the upper part of the pneumatic rod 510; one end of the mechanical leg 520 is connected with the leg fixing plate 530, and the other end thereof is movably abutted against the ground.

Referring to FIGS. 1-2, the bridge detector further comprises a leg fixing plate 530 and a plurality of mechanical legs 520. The leg fixing plate 530 is sleeved and fixed on the pneumatic rod 510. One end of the mechanical leg 520 is connected with the leg fixing plate 530, and the other end thereof is movably abutted against the ground. The position of the leg fixing plate 530 can be adjusted as required. The mechanical leg 520 is rotatably con- nected to the periphery of the leg fixing plate 530 around the leg fixing plate 530, which is convenient to accommodate the mechani- cal leg 520. More preferably, the mechanical leg 520 is a tele- scopic rod, which is convenient to adjust.

The rotating shaft bracket 410 is used to install and fix the pneumatic rod 510. The pneumatic rod 510 changes the transporta- tion and working state through the rotating shaft 420, and is fixed with the front and rear hoops at the same time. When the pneumatic rod 510 is in operation, the pneumatic rod is fixedly supported by the mechanical leg 520. The mechanical leg 520 acts as the bearing mechanism of all lateral loads.

The top of the pneumatic rod 510 is provided with an in- stalling plate 540, and the bridge disease detection system 600 is installed on the top of the pneumatic rod 510 through the in- stalling plate 540.

Preferably, the bridge disease detection system 600 comprises a ball camera shooting module and a signal receiving and transmit- ting module; the bridge detector further comprises a power supply module; the ball camera shooting module is in signal connection with the signal receiving and transmitting module; the electric control module and the power supply module are provided in the box body 110, and the electric control module is in signal connection with the signal receiving and transmitting module; the power sup- ply module is in power supply connection with the bridge disease detection system 600.

During detection, the diseases are detected by the ball cam- era shooting module installed at the top of the pneumatic rod 510, and the obtained signals are sent to the box body 110 through the signal receiving and transmitting module, which is convenient for verifying the monitoring results, and at the same time, is conven- ient for users to control the remote bridge disease detection sys- tem 600 by controlling the electric control module in the box body 110 on the ground. The signals in the present disclosure comprise all common signals such as data and control instructions.

Preferably, the bridge detector further comprises a display module and a storage module, wherein the signal receiving and transmitting module is in signal connection with the display mod- ule and the storage module, respectively.

The display module and the storage module are convenient for storing and displaying the monitoring results frequently, and can be provided at the client or on the operation panel 130 of the box body 110.

The box body 110 is used to install and fix the electric con- trol system, the pneumatic circuit system, the energy power and control system, the wireless communication module, etc. The box body 110 contains the power supply system, the pneumatic circuit system, the wireless communication module and the control system. 1) The power supply of the whole system is provided by a lithium battery, and its main parameters are as follows: 12V of voltage; 20Ah of capacity; 5-6 hours of working time; the battery supplies power to the control system, the pneumatic circuit, the wireless routing, the bridge disease detection system 600 and oth- er devices, respectively. 2) A light air pump is configured; 12V of operating voltage; 200W of rated power; 4.5 kg of weight; 0-8 bar of pressure; the power of the pneumatic circuit system is provided by the air pump.

After the compressed power air passes through the speed control valve, the air is distributed to a four-way joint. The three in- terfaces of the four-way joint are connected to the pneumatic rod 510, the pressure control valve and the deflation circuit valve, respectively. The deflation circuit is connected with two branch air circuits, namely a manual deflation branch and an automatic deflation branch. 3) The control system consists of embedded network software and hardware systems, laser ranging systems, wireless routers and

PCs or clients of mobile phones.

The bridge disease detection system 600 is used to detect bridge diseases such as bridge cracks, supporting frame damage and so on, and comprises a ball camera shooting module, a video, a control signal transmission system, a wireless signal transmission system module, a PC or a client of a mobile phone.

The ball camera shooting module is provided with a 2- megapixel high-definition camera system and an electric zoom fo- cusing function. At the same time, the system has the function of infrared light supplementing. The ball camera shooting module is driven by a precise motor, which is sensitive and stable in opera- tion and has the accuracy deviation less than 0.1 degree. The im- age is not shaken at any speed. The ball camera rotates continu-

ously at 360 degrees in the horizontal direction and at -10 de- grees to 90 degrees in the vertical direction, supporting automat- ic turning, having no blind spots for monitoring, and having 0.2m of the nearest object distance. The functions of scheduled task preset point/pattern scanning/cruise scanning/horizontal scan- ning/vertical scanning/random scanning/frame scanning/panoramic scanning, etc. are supported. At the same time, the ball camera shooting module meets the outdoor installation requirements, and has three preventing functions (water resistance, dust prevention, lightning protection, etc.), and the installation weight is 5.5kg.

The power supply of the bridge disease detection system 600 is directly supplied by the lithium battery. The signal transmis- sion is connected with the router through a dedicated cable, and is connected with the PC or the client of the mobile phone through a wireless router, and the control parameters are set by the dedi- cated interface of the PC or the client of the mobile phone.

In an embodiment, referring to FIG. 1, the bridge detector according to the present disclosure comprises a box body 110, a detector body armrest frame, a rotating shaft bracket 410, a pneu- matic rod 510, a leg fixing plate 530 and a bridge disease detec- tion system 600. The detector body armrest frames are installed on two opposite sides of the box body 110.

The detector body armrest frame comprises a first side beam 310 and a second side beam 320 provided in pairs. One end of the first side beam 310 is fixedly connected to the bottom surface of one end of the box body 110, and the other end is provided with an armrest 340. The other first side beam 310 of the paired first side beams 310 is installed on the other side of the box body 110, and the installation method is the same as above, which will not be described here. The first end of the second side beam 320 is fixedly connected to the bottom surface of the other end of the box body 110. The second end of the second side beam 320 is slida- bly connected along the first side beam 310. An installing member is provided on the second end of the second side beam 320. After the second end of the second side beam 320 slides to the preset position of the first side beam 310, the second end of the second side beam 320 is fixed by the fixing member. The other second side beam 320 of the paired second side beams 320 is installed on the other side of the box body 110, and the installation method is the same as above, which will not be described here. Both ends of the armrest 340 are installed at the free ends of the paired first side beams 310, respectively. The first hoops 330 are also in- stalled at the free ends of the paired first side beams 310. The first hoops 330 are installed on the installing rods, and both ends of the installing rods are installed at the free ends of the paired first side beams 310, respectively.

The rotating shaft bracket 410 comprises a first rod of the rotating shaft bracket 410 and a second rod of the rotating shaft bracket 410. One end of the first rod of the rotating shaft brack- et 410 is fixed on the outer side wall of the box body 110, and the other end thereof is fixed with one end of the rotating shaft 420. One end of the second rod of the rotating shaft bracket 410 is fixed on the outer side wall of the box body 110, and is aligned with the first rod of the rotating shaft bracket 410, and the other end of the second rod of the rotating shaft bracket 410 is fixed with the other end of the rotating shaft 420. The pneu- matic rod 510 is rotatably connected to the rotating shaft 420 around the rotating shaft 420.

The bridge disease detection system 600 is installed at the top of the pneumatic rod 510.

The leg fixing plate 530 is sleeved and fixed on the pneumat- ic rod 510. One end of the mechanical leg 520 is connected with the leg fixing plate 530, and the other end thereof is movably abutted against the ground. The position of the leg fixing plate 530 can be adjusted as required. The mechanical leg 520 is rotata- bly connected around the leg fixing plate 530, which is convenient to accommodate the mechanical leg 520. More preferably, the me- chanical leg 520 is a telescopic rod, which is convenient to ad-

Just.

When in use, the bridge detector is manually transported to the disease detection point and transported in the second state as shown in FIGS. 4-6. The bottom end of the pneumatic rod 510 is tilted upward and clamped in the second hoop 120. The top end of the pneumatic rod 510 extends horizontally forward. The pneumatic rod 510 is parallel to the box body 110. The bridge disease detec- tion system 600 is installed, and the signal line and the power line of the detection system are connected. After installation, the second hoop 120 is loosened, the pneumatic rod 510 is turned from the transportation horizontal state to the vertical state, and is fixed with the first hoop 330. Here, the pneumatic rod 510 is in the first state, as shown in FIGS. 1-3.

The mechanical legs 520 are then installed, ensuring that af- ter the whole device is installed and fixed, after the PC or the client of the mobile phone starts and the application software of the detector is turned on, the switch for starting the pneumatic circuit system on the operation panel 130 is pressed, the control button of the application software is operated to lift the pneu- matic rod 510 to the designated detection height, and the bridge disease detection system 600 is adjusted by operating the applica- tion software of the high-speed ball camera to observe and detect the bridge diseases.

In addition, a horizontal adjusting leg 140 is provided on the bottom plate of the box body 110 of the whole device, and is used to level the horizontal position of the whole detector in co- operation with the level meter on the operation panel 130, so that the detection effect of the detector can be ensured and the sta- bility of the whole device can be improved.

Only a few embodiments of the present disclosure have been described above, rather than limit the present disclosure in any form. Although the present disclosure has been disclosed above as a preferred embodiment, it is not intended to limit the present disclosure. Some changes or modifications made by those skilled in the art using the disclosed technical content are equivalent to the equivalent embodiments without departing from the technical scheme of the present disclosure, which fall within the scope of the technical scheme.

Claims

CONCLUSIONS

1. Bridge detector, comprising: a bridge damage detection system, an electrical control module, a pneumatic rod, and a box, where the bridge damage detection system is installed on the top of the pneumatic rod, and the pneumatic rod is in control communication with the electrical control module ; wherein the pneumatic rod is suspended and rotatably installed above the cabinet; both ends of the pneumatic rod rotating about the center of the pneumatic rod; wherein, after the pneumatic rod has been rotated, the pneumatic rod is suspended from or positioned perpendicular to the cabinet body.

A bridge detector according to claim 1, characterized in that the bridge detector comprises a rotating shaft bracket and the center of the pneumatic rod is rotatably installed on the rotating shaft bracket.

A bridge detector according to claim 1, characterized in that the bridge detector comprises: a rotating shaft bracket and a rotating shaft, the rotating shaft bracket being fixedly installed on the box and extending above the box body to provide a free end to form; both ends of the rotating shaft are respectively installed on the free end of the rotating shaft bracket; wherein the center of the pneumatic rod is rotatably installed in the center of the rotating shaft.

The bridge detector of claim 1, wherein the bridge detector comprises a leg mounting plate and a plurality of mechanical legs, the leg mounting plate having a sleeve and mounted on the top portion of the pneumatic rod; wherein one end of the mechanical leg is connected to the leg mounting plate and the other end thereof lies movably against the ground.

A bridge detector according to claim 4, wherein the mechanical leg is a telescopic rod; wherein one end of the mechanical leg is pivotally connected to the periphery of the leg mounting plate and wherein the mechanical leg pivots about the leg mounting plate.