Online real-time shield scraper wear monitoring system

Abstract

The invention discloses an online real-time shield scraper wear monitoring system, which comprises a shield scraper, a wear sensing device, a data acquisition circuit and a data processing module, wherein the wear sensing device comprises a metal box shell, the metal box shell is internally provided with multiple vertical and horizontal equidistantly-arranged steel sheets and spring trigger modules, the metal box shell is fixedly arranged on the back surface of the shield scraper, the horizontal steel sheets are shortened step by step from top to bottom, the lower ends of the spring trigger modules are fixedly connected with the lower end of the metal box shell, and the upper ends of the spring trigger modules abut against the horizontal steel sheets; the data acquisition circuit is formed by multiple parallel resistors, a power supply and a switch in serial connection via wires and each resistor is connected with a movable block in a corresponding spring trigger module via a wire; and the data processing module comprises a single chip microcomputer processor and a wireless transmitting module. Thus, real-time monitoring can be carried out on the wear amount of the shield scraper, the sensitivity and the range are adjustable, intrusion of water and rock slag can be prevented, and the system can be applied to a harsh shield tunneling environment.

Description

technical field [0001] The invention belongs to the field of mechanized construction and mechanical intelligent monitoring of underground tunnel engineering, and relates to the application of novel sensors, in particular to an online real-time monitoring system for shield scraper wear. Background technique [0002] The shield method construction has been widely used in the construction of urban underground rails. The excavation of the shield scraper in the soil causes wear. If the wear exceeds 20mm, the excavation efficiency will be seriously reduced, causing delays in the construction period or even machine jams. The wear of the scraper is sensed in real time and carried out. Replacement is important. [0003] The shield cutter head and the tunnel face work under pressure, and the method of measuring the wear of the scraper by the staff entering the inside of the cutter head is relatively dangerous; it is also dangerous to estimate the wear of the scraper through theoretica...

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Problems solved by technology

There have been researches in this area at home and abroad. For example, the Chinese invention patent (publication number CN201540105U) proposes a method of using an ultrasonic thickness measuring device to obtain the wear amount of the shield tool. Device; Chinese invention patent (publication number CN102288099A) discloses an online monitoring device for scraper wear of a resistance row type shield machine. The resistors arranged at fixed intervals are placed in the scraper, and the wear of the scraper causes a change in resistance, thereby calculating the wear amount, this method still needs to change the structure of the scraper, and the shield machine works in muddy water, and muddy water conduction will also have a certain impact on the monitoring results; Chinese utility model patent (public number CN203432558U) proposes a shield tunneling machine using a pressure sensor A scraper wear monitoring device, but this method can only alarm when the scraper wears to a certain value, and cannot realize online real-time monitoring of the scraper

[0004] In summary, the current monitoring methods for shield scraper wear have certain deficiencies. The indirect measurement method has too much error, and the direct measurement method needs to change the internal structure of the scraper, which is difficult to achieve. Therefore, it is necessary to propose a new shield scraper. On-line real-time monitoring method of wear

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