阅读说明：本技术 一种斜拉索超声波探伤装置及方法 (Ultrasonic flaw detection device and method for stay cable ) 是由 孙建渊 商志诚 王致皓 于 2019-09-29 设计创作，主要内容包括：本发明涉及一种斜拉索超声波探伤装置及方法,装置包括伸缩式框架系统、分别设于伸缩式框架系统上的爬升系统、超声波探测系统,以及分别与爬升系统、超声波探测系统电连接的控制系统；方法包括：1)将伸缩式框架系统安装于斜拉索外,使爬升系统与斜拉索相贴合；2)通过爬升系统使装置沿斜拉索爬升,并对斜拉索进行超声波探伤；3)当检测结果异常时,控制爬升系统使装置在异常处反复检测,确定结果异常后,记录位置,并继续爬升检测；4)待装置爬升至顶点处,检测结束,下降装置。与现有技术相比,本发明装置结构简单、轻便易携、成本较低、灵敏度高、结果准确、操作安全,可适用于不同直径的斜拉索,具有一定程度的可推广性。(The invention relates to an ultrasonic flaw detection device and method for a stay cable, wherein the device comprises a telescopic frame system, a climbing system and an ultrasonic detection system which are respectively arranged on the telescopic frame system, and a control system which is respectively and electrically connected with the climbing system and the ultrasonic detection system; the method comprises the following steps: 1) mounting the telescopic frame system outside the stay cable to make the climbing system fit with the stay cable; 2) enabling the device to climb along the stay cable through a climbing system, and carrying out ultrasonic flaw detection on the stay cable; 3) when the detection result is abnormal, controlling the climbing system to repeatedly detect the device at the abnormal position, recording the position after determining that the result is abnormal, and continuing climbing detection; 4) and after the device climbs to the vertex, finishing detection and descending the device. Compared with the prior art, the device has the advantages of simple structure, portability, low cost, high sensitivity, accurate result and safe operation, is suitable for stay cables with different diameters, and has certain popularization.)

1. The ultrasonic stay cable flaw detection device is characterized by comprising a telescopic frame system, a climbing system and an ultrasonic detection system which are respectively arranged on the frame system, and a control system which is respectively and electrically connected with the climbing system and the ultrasonic detection system.

2. The ultrasonic stay cable flaw detection device according to claim 1, wherein the telescopic frame system comprises 2 bottom frames (1) arranged in parallel, 2 side frames (2) respectively arranged on the 2 bottom frames (1), 2 top frames (3) respectively arranged above the 2 bottom frames (1), and telescopic connection assemblies respectively arranged between the 2 bottom frames (1) and between the side frames (2) and the corresponding top frames (3).

3. The ultrasonic stay cable flaw detection device according to claim 2, wherein the telescopic connection assembly comprises a connection rod (4) and a connection slot (5) matched with the connection rod (4), and the connection rod (4) and the connection slot (5) are respectively and oppositely arranged on 2 bottom frames (1) or side frames (2) and a top frame (3).

4. The ultrasonic flaw detection device for the stay cable according to claim 3, wherein at least 1 elastic protrusion (6) is arranged on a side wall of one end of the connecting rod (4), and the connecting clamp groove (5) is axially provided with a plurality of bayonets (7) matched with the elastic protrusions (6).

5. The ultrasonic flaw detection device for the stay cable according to claim 4, wherein a blind hole is formed in a side wall of one end of the connecting rod (4), and the elastic protrusion (6) comprises a convex block (601) slidably arranged in the blind hole and a spring (602) arranged between the bottom of the blind hole and the convex block (601).

6. The ultrasonic stay cable flaw detection apparatus according to claim 2, wherein the climbing system comprises 2 driving wheel assemblies respectively provided on 2 top frames (3) and 2 driven wheel assemblies oppositely provided on 2 side frames (2).

7. The ultrasonic stay cable flaw detection device according to claim 6, wherein the driving wheel assembly comprises a motor (8) arranged at the top of the top frame (3) and a driving wheel (10) arranged at the bottom of the top frame (3) and in transmission connection with the motor (8);

the driven wheel assembly comprises a plurality of driven wheels (11) which are axially arranged on the side frame (2) along the stay cable (9).

8. The ultrasonic stay cable inspection apparatus according to claim 2, wherein the ultrasonic inspection system comprises an ultrasonic transmitter (12) and an ultrasonic receiver (13) provided on the bottom frame (1).

9. The ultrasonic stay cable flaw detection apparatus according to claim 2, wherein the control system comprises a transducer (14) electrically connected to the ultrasonic flaw detection system, an electromagnetic wave transceiver (15) electrically connected to the transducer (14) and the climbing system, respectively, a controller (16) electrically connected to the electromagnetic wave transceiver (15), and an oscilloscope (17) electrically connected to the controller (16).

10. An ultrasonic flaw detection method for a stay cable based on the apparatus of any one of claims 1 to 9, comprising the steps of:

1) the telescopic frame system is arranged outside the stay cable (9) and the telescopic amount of the telescopic frame system is adjusted, so that the climbing system is attached to the stay cable (9);

2) starting the climbing system to enable the device to climb along the stay cable (9), and detecting the stay cable (9) through an ultrasonic detection system;

3) when the detection result is abnormal, controlling the climbing system to repeatedly detect the device at the abnormal position, recording the position after determining that the result is abnormal, and continuing climbing detection;

4) and after the device climbs to the vertex, finishing detection and descending the device.

Technical Field

The invention belongs to the technical field of bridge detection, and relates to an ultrasonic flaw detection device and method for a stay cable.

Background

The inclined cable is also called as stay cable, and is the main bearing member for directly transmitting the weight of main beam and bridge deck of cable-stayed bridge to tower. The material of the stay cable of the cable-stayed bridge is usually a steel cable, the form of which differs according to the method of its composition and can be composed of parallel steel wires, parallel steel cables, single steel cables, closed steel cables or solid steel bars. The stay cable is inclined, so it is called as inclined cable.

The stay cable is an important stressed member of the cable-stayed bridge, but is very vulnerable to corrosion damage because the stay cable is exposed to wind, rain and humid air for a long time. This will directly affect the safe use of the cable-stayed bridge. The stay cable is made of steel, so that the stay cable has the characteristic of easy corrosion. In addition, the stay cable can be fatigued under the repeated action of vehicle load, and the vibration phenomena of buffeting and flutter caused by wind load, rain vibration and the like formed by rainwater flowing along the cable increase the influence of the fatigue action of the stay cable, so that the protection system of the stay cable can be damaged, and the corrosion process of the stay cable is accelerated. Therefore, the stay cable detection is an important bridge detection item.

At present, two methods for detecting the stay cable are mainly used. One is to detect the health condition of the stay cable by eye observation using a telescope. This method has difficulty in obtaining accurate results because of the long observation distance. There is also a method of transporting an inspector by a cradle and observing a stay cable at a close distance by using an observation device with higher accuracy. Although the result of this method is relatively accurate, the operation is troublesome and it is difficult to detect the damage inside the stay cable.

Therefore, the ultrasonic flaw detection device is accurate in result, portable, low in cost, convenient to use, safe to use, capable of being used for multiple times and wide in application range.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an ultrasonic flaw detection device and method for a stay cable, in particular to a stay cable flaw detection device which is safe to operate, accurate in result, portable in equipment and wide in application range, and can realize accurate flaw detection of the stay cable by a detection method based on the device.

The purpose of the invention can be realized by the following technical scheme:

an ultrasonic stay cable flaw detection device comprises a telescopic frame system, a climbing system and an ultrasonic detection system which are respectively arranged on the telescopic frame system, and a control system which is respectively electrically connected with the climbing system and the ultrasonic detection system.

And starting the climbing system through the control system to enable the device to climb along the stay cable, carrying out flaw detection on the stay cable through the ultrasonic detection system, and feeding back a detection result to the control system.

Furthermore, the telescopic frame system comprises 2 bottom frames arranged in parallel, 2 side frames arranged on the 2 bottom frames respectively, 2 top frames arranged above the 2 bottom frames respectively, and telescopic connecting assemblies arranged between the 2 bottom frames and between the side frames and the top frames respectively.

The telescopic frame system is used for supporting the climbing system and the ultrasonic detection system, the telescopic connecting assembly can adjust the distance between the 2 bottom frames and the distance between the side frame and the top frame according to the diameter of the stay cable, so that the climbing system is fully attached to the stay cable, the device cannot slide off the stay cable, and the device cannot be moved due to the fact that the climbing system is attached to the stay cable too tightly.

Further, flexible coupling assembling include the connecting rod and with the connecting groove of connecting rod looks adaptation, connecting rod and connecting groove set up relatively respectively on 2 bottom frames, or on side frame and the top frame.

Furthermore, one end lateral wall of the connecting rod is provided with at least 1 elastic bulge, and the connecting clamping groove is axially provided with a plurality of bayonets matched with the elastic bulges.

Furthermore, a blind hole is formed in the side wall of one end of the connecting rod, and the elastic bulge comprises a convex block arranged in the blind hole in a sliding manner and a spring arranged between the bottom of the blind hole and the convex block.

When the telescopic connecting assembly is used, the connecting rod is inserted into the connecting clamping groove, and the elastic bulge is embedded in the corresponding clamping groove as required.

Further, the climbing system comprises 2 driving wheel assemblies respectively arranged on 2 top frames and 2 driven wheel assemblies oppositely arranged on 2 side frames.

Furthermore, the driving wheel assembly comprises a motor arranged at the top of the top frame and a driving wheel arranged at the bottom of the top frame and in transmission connection with the motor;

the driven wheel assembly comprises a plurality of driven wheels which are axially arranged on the side frame along the stay cable.

A plurality of driving wheels can be axially distributed along the stay cable so as to realize the stable operation of the device along the stay cable; each driving wheel can be in transmission connection with a corresponding motor respectively or with the same motor.

The motor drives the driving wheel to rotate, so that the device can ascend and descend along the stay cable, and the driven wheel is mainly used for being matched with the driving wheel to fix the relative position of the device and the stay cable, so that the device can run smoothly on the stay cable.

Furthermore, the ultrasonic flaw detection system comprises an ultrasonic transmitter and an ultrasonic receiver which are arranged on the bottom frame.

Furthermore, the control system comprises a transducer electrically connected with the ultrasonic flaw detection system, an electromagnetic wave transceiver electrically connected with the transducer and the climbing system respectively, a controller electrically connected with the electromagnetic wave transceiver, and an oscilloscope electrically connected with the controller.

When the detection is carried out, the ultrasonic transmitter transmits ultrasonic waves, the ultrasonic waves are received by the ultrasonic receiver after passing through the stay cable and being reflected, the transducer converts received ultrasonic signals into electric signals, the electric signals are transmitted to the controller in an electromagnetic wave mode by the electromagnetic wave transceiver and are displayed on the oscilloscope, and ground staff can judge the health condition of the cross section of the stay cable according to the waveform of the ultrasonic waves.

An ultrasonic flaw detection method for a stay cable based on the device comprises the following steps:

1) installing the bottom frame, the side frames and the top frame outside the stay cable, and adjusting the distance between the 2 bottom frames and the distance between the side frames and the top frame through the telescopic connecting assembly to ensure that the driving wheel and the driven wheel are respectively attached to the stay cable;

2) starting the ultrasonic detection system and the control system, testing the working condition of the ultrasonic detection system, then starting the motor, enabling the device to climb along the stay cable, and detecting the stay cable through the ultrasonic detection system;

3) when the detection result is abnormal, controlling the motor to repeatedly detect the device at the abnormal position, recording the position after the result is abnormal, and continuing climbing detection;

4) and after the device climbs to the vertex, finishing detection and descending the device.

The working principle is as follows: the device detects the flaw of the stay cable based on the ultrasonic flaw detection technology, the stay cable is attached to the climbing system through the telescopic amount of the detachable adjustable telescopic frame system, the device slowly moves along the stay cable through the climbing system, meanwhile, the ultrasonic flaw detection system detects the flaw of the stay cable, the detection result is transmitted to the controller in an electromagnetic wave mode and is displayed through the oscilloscope, and ground workers judge the health condition of the corresponding stay cable based on the waveform displayed by the oscilloscope.

Compared with the prior art, the invention has the following characteristics:

1) the invention adopts the ultrasonic flaw detection technology to carry out flaw detection on the stay cable, and has the advantages of large detection depth, high sensitivity, accurate and quick result, safe operation and the like;

2) the ultrasonic flaw detection system and the climbing system are carried by the telescopic frame system with a simple structure, so that the device has the advantages of light weight, portability, low cost and the like;

3) the invention connects each part of the telescopic frame system through the buckle structure, and realizes the telescopic function of the telescopic frame system based on the structure, thereby adapting to stay cables with different diameters and leading the device to have certain popularization.

Drawings

FIG. 1 is a schematic front view of an ultrasonic testing apparatus for a stay cable according to the present invention;

FIG. 2 is a schematic top view of an ultrasonic testing apparatus for a stay cable according to the present invention;

FIG. 3 is a schematic front view of the connecting rod;

FIG. 4 is a left side cross-sectional view of the connecting rod;

FIG. 5 is a schematic front view of the connecting slot;

FIG. 6 is a left side cross-sectional view of the connector card slot;

FIG. 7 is a schematic diagram of a controller and an oscilloscope;

FIG. 8 is a schematic view showing the inside structure of an equipment box in embodiment 1;

the notation in the figure is:

1-bottom frame, 2-side frame, 3-top frame, 4-connecting rod, 5-connecting clamping groove, 6-elastic protrusion, 601-bump, 602-spring, 7-bayonet, 8-motor, 9-stay cable, 10-driving wheel, 11-driven wheel, 12-ultrasonic transmitter, 13-ultrasonic receiver, 14-transducer, 15-electromagnetic wave transceiver, 16-controller, 17-oscilloscope, 18-power supply and 19-equipment box.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.