Hohai University

Lijun Hou

Baodong Lou

Da Chen

Feng Ouyang

Shuitao Gu

Yazhou Zhao

Xingguo Feng

Ning Zhuang

Yingdi Liao

A gate detection robot based on a giant magnetoresistance element includes a support, a guide wheel, and two driving wheels are provided at the bottom of the support. The support is provided with a controller, a range-based localization module, and a magnetic flaw detection sensor based on the giant magnetoresistance element. The magnetic flaw detection sensor includes an excitation mechanism, a giant magnetic sensor, and two magnetic concentrators. During detection, the excitation mechanism magnetizes a gate with a magnetic field as a medium. When the surface of the gate has a defect, the magnetic conductivity of the local area is reduced and the magnetic resistance is increased so that magnetic lines are distorted and diffused outside the gate to form a detectable leakage magnetic field signal, the signal is transmitted to the controller, so that the controller obtains a specific location of the detection robot.

Gate detection robot based on giant magnetoresistance element and detection method

The present invention discloses a damage detection apparatus for a lock gate sill, including a support, a water storage tank, a water inlet barrel, a filter device, a water pump, and a control device, wherein a barrier is vertically disposed at the bottom of the water storage tank, multiple water discharge pipes are vertically disposed in the barrier, upper ends of the water discharge pipes are communicated with the water storage tank, the water discharge pipes have different heights, lower ports of the water discharge pipes together compose a truncated conical cavity, a camera is disposed at the bottom of the water storage tank in a sealed manner, and a lens of the camera is located in an upper part of the truncated conical cavity. When it is desired to perform damage detection for the lock gate sill, muddy water is filtered by the filter device into clear water, and the clear water is pressurized by the water pump and then discharged from the water discharge pipes, such that the muddy water in the barrier is continuously diluted by clear water, the camera is in a shooting environment of clear water, and the lock gate sill is shot for detection at this time, whereby it is ensured that the taken picture has good definition, and thus the position of abrasion and the amount of abrasion of the lock gate sill can be clearly determined.

Damage detection apparatus for lock gate sill

The present invention discloses a ship draught detection apparatus and its detection method. The ship draught detection apparatus includes two servo motors, a guide rail, a sonar detection device, a traction device, a locating device, and a control device. Compared with the provision of a series of sonar detection devices in the prior art, the provision of one sonar detection device reduces the cost and there is no mutual interference between adjacent sonars. Meanwhile, because a lock gate width of a ship lock is greater than a width of the ship, in order to improve the detection precision, the locating device is configured to predict in advance an accurate position of the ship when passing the ship lock according to the position of the ship and the orientation of a ship bow, and the control device controls the rotation speed and the direction of the two servo motors, and makes the sonar detection device move along the guide rail through the ropes, so that the sonar detection device is located just below the ship when the ship passes the ship lock, thereby improving the detection precision.

Ship draught detection apparatus and its detection method

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Jiangsu, China

Lijun Hou