CN210737367U

CN210737367U - Foldable truss type bridge detection vehicle

Info

Publication number: CN210737367U
Application number: CN201921422488.1U
Authority: CN
Inventors: 魏雅君; 洪嘉阳; 杨超; 尤亚巧; 苏志达
Original assignee: Xiamen University Tan Kah Kee College
Current assignee: Xiamen University Tan Kah Kee College
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2020-06-12
Anticipated expiration: 2029-08-29

Abstract

The utility model relates to a collapsible truss-like bridge inspect vehicle, including mobile support, horizontal flexible arm, vertical flexible arm and test arm, the rear end of test arm is articulated with the front end of vertical flexible arm to can turn over when test arm receipts are closed and roll over in the vertical flexible arm of income, the rear end of vertical flexible arm is articulated with the front end of horizontal flexible arm, in order to turn over when vertical flexible arm receipts are closed and roll over the horizontal flexible arm of income, the rear end and the mobile support rotation of horizontal flexible arm are connected to carry out the rotation of horizontal direction. The bridge inspection vehicle is reasonable in structure, simple and convenient to operate, small in occupied space, convenient to transport and store and wide in application range.

Description

Foldable truss type bridge detection vehicle

Technical Field

The utility model relates to a bridge detects technical field, concretely relates to collapsible truss-like bridge inspect vehicle.

Background

Bridge construction is one of the national important infrastructures, and bridge engineering is life line engineering for harmonious development of the relationship society and the economy. Due to the rapid development of bridge construction and huge capital investment, people pay more and more attention to the safety and durability of the bridge. To the detection and protection problem of bridge, basket type and truss type bridge detection vehicles appear on the market nowadays. Patent CN208621524U discloses a bridge detection arm support with horizontal sweeping function, which designs multiple adjusting mechanisms to make the structure very stable. It has the problems that: the equipment transportation is not simple and convenient, and partial detection is finished through manual visual inspection, so that the safety risk of bridge detection personnel is increased. Patent CN109468948A discloses a folding arm formula both arms bridge inspect vehicle, its bridge that has both arms detects the operation form, and has added rotary mechanism, not only lets two work arms can work alone, still can let bridge inspect arm reach the position that is difficult to detect and detect. However, the folding arm type double-arm bridge detection vehicle is based on the bridge detection arm of a large-sized automobile, so that the cost of the bridge detection vehicle is increased, the manufacturing cost is very high, and the market popularization is not facilitated. Patent CN102041776A discloses an intellectuality and artifical dual-purpose bridge inspect vehicle, it has stable and complicated truss structure for holistic bridge inspect vehicle stability is good, and the security is high. The bridge inspection vehicle is also provided with an image acquisition and analysis system, and the working efficiency is high. The problem of this inspection vehicle lies in: although the bridge detection device is complete in function, the structure is complex, the manufacturing cost is high, and the whole bridge detection device cannot be conveniently and quickly unfolded and zoomed.

Disclosure of Invention

An object of the utility model is to provide a collapsible truss-like bridge inspect vehicle, this bridge inspect vehicle is rational in infrastructure, and is easy and simple to handle, and occupation space is little, and the transportation of being convenient for is deposited, and application scope is wide.

In order to achieve the above purpose, the technical scheme of the utility model is that: the utility model provides a collapsible truss-like bridge inspect vehicle, includes mobile support, horizontal flexible arm, vertical flexible arm and detection arm, the rear end of detection arm is articulated with the front end of vertical flexible arm to can turn over when detection arm receipts are closed and roll over during the vertical flexible arm of income, the rear end of vertical flexible arm is articulated with the front end of horizontal flexible arm, in order can turn over when vertical flexible arm receipts are closed and roll over the horizontal flexible arm of income, the rear end and the mobile support of horizontal flexible arm rotate to be connected, in order to carry out the rotation of horizontal direction.

Further, but movable support includes AGV dolly, elevating system, first motor, backup pad and steering spindle, the backup pad is installed on the AGV dolly through elevating system, the steering spindle is located in the backup pad to rotate with the backup pad through the bearing and is connected, first motor is installed under the backup pad, and its output is connected with the steering spindle, in order to drive its rotation, the rear end of horizontal flexible arm is installed on the steering spindle, in order to carry out the horizontal rotation along with it.

Further, the horizontal flexible arm includes first support arm, second motor and horizontal drive mechanism, the second support arm nestification is in first support arm, the second motor is installed on first support arm to slide around first support arm is followed to drive the second support arm through horizontal drive mechanism, so that the second support arm stretches out or the first support arm of retraction, the second support arm is greater than the hollow structure of vertical flexible arm for inner space, the rear end of vertical flexible arm is articulated with the front end of second support arm, in order to receive when vertical flexible arm is closed, can turn over when rolling over and roll over in the second support arm.

Furthermore, the transverse transmission mechanism mainly comprises a transmission belt shaft and a transmission belt, the transmission belt shaft is arranged at the front end and the rear end of one side wall of the first support arm respectively, the transmission belt shaft is fixed on the side wall of the first support arm through a bearing support seat respectively, the transmission belt is wound on the side wall through the two transmission belt shafts so as to be driven by the transmission belt shaft to rotate, the second motor is fixed on the first support arm through a motor fixing seat, an output shaft of the second motor is connected with one transmission belt shaft through a coupler so as to drive the transmission belt shaft to rotate, a connecting plate is arranged at the rear end of the second support arm, a connecting part is arranged at the position of the connecting plate facing the transmission belt, and the connecting part is fixedly connected with the inner side section of the transmission belt facing the first support arm through a fastener so as to drive the second support arm to slide back and forth along the; and the rear end of the second support arm is provided with a limiting structure so as to clamp the first support arm for limiting when the second support arm moves backwards to a limit position.

Further, the longitudinal telescopic arm comprises a plurality of support arms, each support arm is sequentially nested in the other support arm and driven by a corresponding motor and a corresponding transmission mechanism to slide back and forth along the support arm outside the longitudinal telescopic arm so as to perform telescopic motion, the rear end of the support arm on the outermost side is hinged with the front end of the transverse telescopic arm and driven by a corresponding motor and a corresponding transmission mechanism to overturn so as to be folded and collected into the transverse telescopic arm, and the front end of the support arm on the innermost side is hinged with the rear end of the detection arm.

Furthermore, the longitudinal telescopic arm comprises a third support arm, a fourth support arm, a fifth support arm, a third motor, a steering transmission mechanism, a fourth motor, a first winding drum, a fifth motor, a second winding drum, a sixth motor, a third winding drum, a seventh motor, a fourth winding drum, a motor mounting seat and steel cables respectively wound on the first winding drum, the second winding drum, the third winding drum and the fourth winding drum, the fifth support arm is nested in the fourth support arm, and the fourth support arm is nested in the third support arm; the motor mounting seat is fixedly connected with the front end of the transverse telescopic arm, the motor mounting seat is of a three-layer structure, the third motor and the steering transmission mechanism are mounted on the first layer, a rotating shaft is arranged at the rear end of the third supporting arm, and the third motor is in transmission connection with the rotating shaft through the steering transmission mechanism so as to drive the third supporting arm to turn over through the rotating shaft; the fourth motor, the first winding drum, the fifth motor and the second winding drum are arranged on the second layer, the steel cables on the first winding drum and the second winding drum are connected with the rear end of the fifth support arm, and the fourth motor and the fifth motor are respectively connected with the first winding drum and the second winding drum so that when the first winding drum and the second winding drum are driven to rotate, the fifth support arm is driven to slide back and forth along the fourth support arm through the steel cables on the first winding drum and the second winding drum so as to perform telescopic motion; the sixth motor, the third winding drum, the seventh motor and the fourth winding drum are arranged on a third layer, steel cables on the third winding drum and the fourth winding drum are connected with the rear end of the fourth support arm, and the sixth motor and the seventh motor are respectively connected with the third winding drum and the fourth winding drum so that when the third winding drum and the fourth winding drum are driven to rotate, the fourth support arm is driven to slide back and forth along the third support arm through the steel cables on the third winding drum and the fourth winding drum so as to perform telescopic motion; the fifth support arm is of a hollow structure, the inner space of the fifth support arm is larger than that of the detection arm, and the rear end of the detection arm is hinged to the front end of the fifth support arm so that the detection arm can be folded into the fifth support arm when being folded.

Further, detect the arm including turning to device, first detection support arm, second detection support arm, detection camera and distancer, turn to the device and install in vertical flexible arm front end, the output that turns to the device is connected with the rear end transmission of first detection support arm to drive first detection support arm and overturn, the second detects the support arm and inlays and locate in first detection support arm, just the front end of first detection support arm rotates with the rear end that the second detected the support arm to it drives the second through the detection of installing on it and detects the lateral part upset of support arm along first detection support arm to detect camera and distancer and install in the front end that the second detected the support arm.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides a collapsible truss-like bridge inspect vehicle that closes, it makes whole car fold to receive to very little space when not using through scientific and reasonable structural design, and turns over to expand at the during operation again, not only easily operation, compact structure, light moreover, occupation space is little, is convenient for transport and deposits, has very strong practicality and wide popularization and application prospect.

Drawings

Fig. 1 is a schematic view of an expanded state of the embodiment of the present invention.

Fig. 2 is a schematic view of the folded state of the embodiment of the present invention.

Fig. 3 is a schematic structural diagram of the movable support in the embodiment of the present invention.

Fig. 4 is a schematic structural diagram of the transverse telescopic arm in the embodiment of the present invention.

Fig. 5 is a sectional view a-a of fig. 4.

Fig. 6 is a schematic structural diagram of a connection plate in an embodiment of the present invention.

Fig. 7 is a schematic structural view of the longitudinal telescopic arm in the embodiment of the present invention.

Fig. 8 is a schematic view of a connection structure of the longitudinal telescopic arm and the transverse telescopic arm in the embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a detection arm in an embodiment of the present invention.

In the figure, 1, a movable support; 2. a transverse telescopic arm; 3. a longitudinally telescoping arm; 4. a detection arm; 11. an AGV trolley; 12. a lifting mechanism; 13. a first motor; 14. a support plate; 15. a steering shaft; 21. a first support arm; 22. a second support arm; 23. a second motor; 24. a drive belt shaft; 25. a transmission belt; 26. a bearing support seat; 27. a motor fixing seat; 28. a coupling; 29. a connecting plate; 210. a connecting portion; 211. a limiting structure; 31. a third support arm; 32. a fourth support arm; 33. a fifth support arm; 34. a third motor; 35. a steering transmission mechanism; 36. a fourth motor; 37. a first reel; 38. a fifth motor; 39. a second reel; 310. a sixth motor; 311. a third reel; 312. a seventh motor; 313. a fourth reel; 314. a motor mounting seat; 315. a wire rope; 316. a rotating shaft; 317. a lifting lug at the rear end of the fifth support arm; 318. a lifting lug at the rear end of the fourth support arm; 41. a steering device; 42. a first detection support arm; 43. a second detection support arm; 44. detecting a camera; 45. an infrared two-way range finder; 46. a folding device.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The utility model provides a collapsible truss-like bridge inspect vehicle, as shown in figure 1, 2, including portable support 1, horizontal flexible arm 2, vertical flexible arm 3 and detection arm 4, the rear end of detection arm 4 is articulated with the front end of vertical flexible arm 3 to can turn over when detection arm 4 receipts are closed and roll over in the vertical flexible arm 3 of income, the rear end of vertical flexible arm 3 is articulated with the front end of horizontal flexible arm 2, in can turning over when vertical flexible arm 3 receipts are closed and roll over in the horizontal flexible arm 2 of income, the rear end of horizontal flexible arm 2 rotates with portable support 1 and is connected to carry out the rotation of horizontal direction.

As shown in fig. 3, the movable support 1 includes an AGV cart 11, an elevating mechanism 12, a first motor 13, a support plate 14 and a steering shaft 15, the support plate 14 is installed on the AGV cart 11 through the elevating mechanism 12, the steering shaft 15 is installed on the support plate 14 and is connected with the support plate 14 through a bearing in a rotating manner, the first motor 13 is installed under the support plate 14, and the output end thereof is connected with the steering shaft 15 to drive the rotation thereof, and the rear end of the transverse telescopic arm 2 is installed on the steering shaft 15 to rotate horizontally therewith.

As shown in fig. 4 and 5, in this embodiment, the transverse telescopic arm 2 includes a first arm 21, a second arm 22, a second motor 23 and a transverse transmission mechanism, the second arm 22 is nested in the first arm 21, the second motor 23 is installed on the first arm 21, and drives the second arm 22 to slide back and forth along the first arm 21 through the transverse transmission mechanism, so that the second arm 22 extends out of or retracts into the first arm 21, the second arm 22 is a hollow structure with an inner space larger than that of the longitudinal telescopic arm 3, and the rear end of the longitudinal telescopic arm 3 is hinged to the front end of the second arm 22, so that the longitudinal telescopic arm 3 can be folded into the second arm 22 when being folded.

Specifically, transverse transmission mechanism mainly comprises drive belt axle 24 and drive belt 25, both ends are equipped with drive belt axle 24 respectively around the first support arm 21 lateral wall, drive belt axle 24 is fixed in on the first support arm 21 lateral wall through bearing support seat 26 respectively, drive belt 25 warp two drive belt axles 24 are around locating on the lateral wall to drive the operation by drive belt axle 24, second motor 23 is fixed in on first support arm 21 through motor fixing base 27, and second motor 23 output shaft is connected with one of them transmission belt axle 24 through shaft coupling 28, in order to drive belt axle 24 rotatory. The rear end of the second arm 22 has a connecting plate 29, the structure of which is shown in fig. 6, a connecting portion 210 is arranged at a position of the connecting plate 29 facing the conveyor belt, and the connecting portion 210 is fixedly connected with the inner side section of the conveyor belt 25 facing the first arm 21 through a fastener, so as to drive the second arm 22 to slide back and forth along the first arm 21 through the operation of the conveyor belt 25. In this embodiment, the connecting portion 210 is a lug-shaped structure having a through hole, the belt 25 is correspondingly provided with a through hole, and the connecting portion 210 and the belt 25 are fixedly connected by a threaded fastener. The rear end of the second arm 22 is provided with a limiting structure 211 to block the first arm 21 for limiting when the second arm 22 moves backwards to the limit position.

As shown in fig. 7 and 8, in this embodiment, the longitudinal telescopic arm 3 includes a plurality of support arms, each support arm is nested in another support arm in sequence, and is driven by a corresponding motor and transmission mechanism to slide back and forth along the support arm outside the longitudinal telescopic arm, so as to perform telescopic movement, the rear end of the support arm on the outermost side is hinged to the front end of the transverse telescopic arm 2, and is driven by a corresponding motor and transmission mechanism to turn over, so as to be folded into the transverse telescopic arm, and the front end of the support arm on the innermost side is hinged to the rear end of the detection arm 4.

Specifically, the longitudinally-extending and retracting arm 3 includes a third arm 31, a fourth arm 32, a fifth arm 33, a third motor 34, a steering transmission mechanism 35, a fourth motor 36, a first reel 37, a fifth motor 38, a second reel 39, a sixth motor 310, a third reel 311, a seventh motor 312, a fourth reel 313, a motor mount 314, and cables 315 wound on the first, second, third, and fourth reels, respectively. The fifth arm 33 is nested in the fourth arm 32, and the fourth arm 32 is nested in the third arm 31. The motor mount pad 314 and the 2 front ends of horizontal flexible arm, second support arm 22 front end fixed connection promptly, motor mount pad 314 is three layer construction, third motor 34 with turn to drive mechanism 35 and install on first layer, in this embodiment, the rear end of third support arm 31 is equipped with pivot 316, third motor 34 through turn to drive mechanism 35 with pivot 316 transmission is connected, turns to drive mechanism 35 and is belt drive mechanism to through pivot 316 drive third support arm 31 overturns. The fourth motor 36, the first reel 37, the fifth motor 38 and the second reel 39 are installed on the second layer, the steel cables on the first reel and the second reel are connected with the lifting lug 317 at the rear end of the fifth support arm 33, and the fourth motor and the fifth motor are respectively connected with the first reel and the second reel so as to drive the fifth support arm 33 to slide back and forth along the fourth support arm 32 through the steel cables on the first reel and the second reel when the first reel and the second reel are driven to rotate, so as to perform telescopic motion. The sixth motor 310, the third winding drum 311, the seventh motor 312 and the fourth winding drum 313 are installed on the third layer, the steel cables on the third winding drum and the fourth winding drum are connected with the lifting lug 318 at the rear end of the fourth support arm 32, and the sixth motor and the seventh motor are respectively connected with the third winding drum and the fourth winding drum so as to drive the fourth support arm 32 to slide back and forth along the third support arm 31 through the steel cables on the third winding drum and the fourth winding drum when the third winding drum and the fourth winding drum are driven to rotate, so as to perform telescopic movement. The fifth support arm 33 is a hollow structure with an internal space larger than that of the detection arm 4, and the rear end of the detection arm 4 is hinged to the front end of the fifth support arm 33 so as to be folded into the fifth support arm when the detection arm 4 is folded.

As shown in fig. 9, the detecting arm 4 includes a steering device 41, a first detecting arm 42, a second detecting arm 43, a detecting camera 44 and a distance meter 45, the steering device is installed on the longitudinal telescopic arm 3, i.e. the front end of the fifth arm 33, the output end of the steering device 41 is in transmission connection with the rear end of the first detecting arm 42 to drive the first detecting arm 42 to turn, the second detecting arm 43 is embedded in the first detecting arm 42, the front end of the first detecting arm 42 is in rotation connection with the rear end of the second detecting arm 43, and drives the second detecting arm 43 to turn along the side of the first detecting arm 42 through a folding device 46 installed on the second detecting arm, and the detecting camera 44 and the distance meter 45 are installed at the front end of the second detecting arm 43.

The utility model discloses an operation flow as follows: when the foldable truss type bridge detection vehicle reaches a specified bridge to prepare for operation, firstly, the movable support 1 raises the height of the whole bridge detection arm through the lifting mechanism 12, so as to fulfill the aim that the whole bridge detection arm is higher than a bridge guardrail. Then, the stepping motor 13 drives the steering shaft 15 to rotate the entire bridge inspection arm by 90 degrees, so that the transverse telescopic arm 2 faces the outer edge of the guardrail of the bridge. The transverse transmission mechanism is then powered by the stepping motor 23 to rotate the belt 25 clockwise to advance the first arm 21 by the connecting plate 29. When the first arm 21 is pushed to the limit position, the limit mechanism 211 limits the position and stops the operation. Then, the steering operation is started, and the power is transmitted to the rotating shaft 316 through the steering transmission mechanism 35 by the servo motor 34, so as to complete the operation that the longitudinal telescopic arm 3 rotates clockwise by 90 degrees downward from the transverse telescopic arm 2. Then, the

servo motors

36, 38, 310, 312 output power to the

reels

37, 39, 311, 313 respectively to drive the corresponding cables to pay out, the fourth arm 32 is lowered from the third arm 31, and the fifth arm 33 is lowered from the fourth arm 32. When the fifth arm 33 is completely lowered, the steering device 41 rotates clockwise by 90 degrees, and the detection arm 4 is released from the fifth arm 33 by rotating 90 degrees. Then the second detection arm 43 is driven by the folding device 46 to fully extend for 180 degrees, so as to complete the full extension mode of the foldable truss type bridge detection vehicle based on the AGV. During operation, the infrared bidirectional detector 45 is used for detecting the distance between the detection arm 4 and the bottom of the bridge and each obstacle, and the position of the detection arm 4 detected on the back of the bridge is adjusted through the transverse telescopic arm 2 and the longitudinal telescopic arm 3.

Above is the utility model discloses a preferred embodiment, all rely on the utility model discloses the change that technical scheme made, produced functional action does not surpass the utility model discloses during technical scheme's scope, all belong to the utility model discloses a protection scope.

Claims

1. The utility model provides a collapsible truss-like bridge inspect vehicle, its characterized in that, includes mobile support, horizontal flexible arm, vertical flexible arm and detection arm, the rear end of detection arm is articulated with the front end of vertical flexible arm to can turn over when detection arm receipts are closed and roll over in the vertical flexible arm of income, the rear end of vertical flexible arm is articulated with the front end of horizontal flexible arm, in order can turn over when vertical flexible arm receipts are closed and roll over the horizontal flexible arm of income, the rear end and the mobile support of horizontal flexible arm rotate and be connected to carry out the rotation of horizontal direction.

2. The foldable truss type bridge inspection vehicle of claim 1, wherein the movable support comprises an AGV trolley, an elevating mechanism, a first motor, a support plate and a steering shaft, the support plate is mounted on the AGV trolley through the elevating mechanism, the steering shaft is arranged on the support plate and is rotatably connected with the support plate through a bearing, the first motor is mounted under the support plate, the output end of the first motor is connected with the steering shaft to drive the first motor to rotate, and the rear end of the transverse telescopic arm is mounted on the steering shaft to rotate horizontally along with the first motor.

3. The foldable truss bridge inspection vehicle of claim 1, wherein the transverse telescopic arm comprises a first arm, a second motor and a transverse transmission mechanism, the second arm is nested in the first arm, the second motor is mounted on the first arm and drives the second arm to slide back and forth along the first arm via the transverse transmission mechanism, so that the second arm extends out of or retracts into the first arm, the second arm is a hollow structure with an inner space larger than that of the longitudinal telescopic arm, and the rear end of the longitudinal telescopic arm is hinged to the front end of the second arm so as to fold back into the second arm when the longitudinal telescopic arm is folded.

4. The foldable truss bridge inspection vehicle of claim 3, wherein the transverse transmission mechanism is mainly composed of a transmission belt shaft and a transmission belt, the front end and the rear end of one side wall of the first support arm are respectively provided with a transmission belt shaft, the transmission belt shafts are respectively fixed on the side wall of the first support arm through bearing supporting seats, the transmission belt is wound on the side wall through the two transmission belt shafts, driven by a transmission belt shaft to operate, the second motor is fixed on the first support arm through a motor fixing seat, an output shaft of the second motor is connected with one transmission belt shaft through a coupling, the rear end of the second support arm is provided with a connecting plate, a connecting part is arranged on the position of the connecting plate facing the conveyor belt, the connecting part is fixedly connected with the inner side section of the transmission belt facing the first support arm through a fastener so as to drive the second support arm to slide back and forth along the first support arm through the operation of the transmission belt; and the rear end of the second support arm is provided with a limiting structure so as to clamp the first support arm for limiting when the second support arm moves backwards to a limit position.

5. The foldable truss bridge inspection vehicle of claim 1, wherein the longitudinally-extending arm includes a plurality of arms, each arm is nested in another arm, and is driven by a corresponding motor and transmission mechanism to slide back and forth along the outer arm for extending and retracting movement, the rear end of the outermost arm is hinged to the front end of the transversely-extending arm, and is driven by a corresponding motor and transmission mechanism to turn over for being folded into the transversely-extending arm, and the front end of the innermost arm is hinged to the rear end of the inspection arm.

6. The foldable truss bridge inspection vehicle of claim 5, wherein the longitudinal telescopic arm comprises a third arm, a fourth arm, a fifth arm, a third motor, a steering transmission mechanism, a fourth motor, a first drum, a fifth motor, a second drum, a sixth motor, a third drum, a seventh motor, a fourth drum, a motor mounting seat and steel cables wound on the first drum, the second drum, the third drum and the fourth drum respectively, the fifth arm is nested in the fourth arm, and the fourth arm is nested in the third arm; the motor mounting seat is fixedly connected with the front end of the transverse telescopic arm, the motor mounting seat is of a three-layer structure, the third motor and the steering transmission mechanism are mounted on the first layer, a rotating shaft is arranged at the rear end of the third supporting arm, and the third motor is in transmission connection with the rotating shaft through the steering transmission mechanism so as to drive the third supporting arm to turn over through the rotating shaft; the fourth motor, the first winding drum, the fifth motor and the second winding drum are arranged on the second layer, the steel cables on the first winding drum and the second winding drum are connected with the rear end of the fifth support arm, and the fourth motor and the fifth motor are respectively connected with the first winding drum and the second winding drum so that when the first winding drum and the second winding drum are driven to rotate, the fifth support arm is driven to slide back and forth along the fourth support arm through the steel cables on the first winding drum and the second winding drum so as to perform telescopic motion; the sixth motor, the third winding drum, the seventh motor and the fourth winding drum are arranged on a third layer, steel cables on the third winding drum and the fourth winding drum are connected with the rear end of the fourth support arm, and the sixth motor and the seventh motor are respectively connected with the third winding drum and the fourth winding drum so that when the third winding drum and the fourth winding drum are driven to rotate, the fourth support arm is driven to slide back and forth along the third support arm through the steel cables on the third winding drum and the fourth winding drum so as to perform telescopic motion; the fifth support arm is of a hollow structure, the inner space of the fifth support arm is larger than that of the detection arm, and the rear end of the detection arm is hinged to the front end of the fifth support arm so that the detection arm can be folded into the fifth support arm when being folded.

7. The foldable truss bridge inspection vehicle of claim 1, wherein the inspection arm comprises a steering device, a first inspection arm, a second inspection arm, an inspection camera and a distance meter, the steering device is mounted at the front end of the longitudinal telescopic arm, the output end of the steering device is in transmission connection with the rear end of the first inspection arm to drive the first inspection arm to turn over, the second inspection arm is embedded in the first inspection arm, the front end of the first inspection arm is in rotation connection with the rear end of the second inspection arm, and drives the second inspection arm to turn over along the side portion of the first inspection arm through the inspection steering device mounted on the second inspection arm, and the inspection camera and the distance meter are mounted at the front end of the second inspection arm.