Tunnel boring machine hob abrasion type judgment and abrasion loss monitoring system and method

Abstract

The invention discloses a tunnel boring machine hob abrasion type judgment and abrasion loss monitoring system and method. The method comprises the steps that the rotating frequency and frequency distribution of a hob in tunneling unit time or unit distance of a tunnel boring machine are obtained; according to the influence of different abrasion types of the hobbing cutter on the rotating interval time of the hobbing cutter, qualitative judgment of the abrasion types of the hobbing cutter is completed through the abrasion frequency distribution characteristics of the hobbing cutter; and the average abrasion loss is quantitatively calculated by using the rotation frequency of the hob. According to the method, hob abrasion type judgment and abrasion average value calculation can be completed at the same time, and the method is simple, reliable and suitable for monitoring all hob abrasion types of the tunnel boring machine; meanwhile, the device is easy to operate, low in price and high in applicability, and has important significance in on-site hob abrasion monitoring and cost control.

Description

technical field [0001] The invention relates to the technical field of hob wear monitoring of a full-section tunnel boring machine, in particular to a system and method for discriminating wear types and monitoring wear amount of a tunnel boring machine hob. Background technique [0002] The full-face tunnel boring machine has become the main tool for tunnel construction due to its high degree of mechanization, fast excavation speed, strong stratum adaptability, safety and high efficiency. As the main tool for the tunnel boring machine to excavate the ground, the hob will wear out due to the abrasive effect of the ground during the tunneling process. When the wear reaches a certain limit, it needs to be replaced and repaired in time, otherwise the tunnel boring machine will be damaged. The thrust increases, the torque increases, the penetration decreases, and the tunneling speed decreases. At the same time, excessive wear will increase the probability of the hob being scrappe...

AI Technical Summary

Problems solved by technology

The open warehouse inspection method is the most common method, but it needs to stop and enter the soil warehouse for manual inspection, which is time-consuming, laborious, expensive, and needs to bear safety risks such as water gushing and collapse on the working surface

The odor additive method is to add irritating substances to the lubricating oil of the hob, and judge whether the hob is worn by the smell of muck. However, it is limited by the soil conditioner and formation conditions, and the accuracy and practicability of this method are poor.

The pressure line monitoring method monitors the oil pressure inside the hob or the on-off of the line by adding lines. When the oil pressure is lost or the line is disconnected, it means that the hob is excessively worn. However, this method has high requirements for hob processing, and additional lines Complex layout, difficult to use in engineering

[0004] Scholars at home and abroad have developed a variety of hob wear real-time monitoring devices and methods based on the principles of acousto-optics, electromagnetics and wireless transmission. sex

The main difficulties faced by the existing methods mainly include the following two points: First, the hob cutting working environment is often filled with conductors such as muddy water and rock and soil, and the wear value of the hob is often within 30mm. Surveying, magnetic induction sensors, etc. to monitor the contour of the hob blade cannot overcome the "contradiction between the harsh working environment and accurate measurement requirements"; The hob is idling or stalled, so the instantaneous quantities such as the angular velocity and linear velocity of the hob of the tunnel boring machine have strong fluctuations and inaccuracies, and the measurement method based on the instantaneous quantity cannot accurately determine the actual wear state of the hob. Judgment, on the contrary, for hob wear type identification and wear value measurement means should be based on the results of a period of monitoring through statistical processing to eliminate instantaneous fluctuation characteristics

[0005] In addition, the existing tool wear monitoring methods are complicated and can only monitor a small number of tools with high wear risk, and cannot realize real-time and accurate monitoring of all tools

[0006] In view of the above-mentioned defects in the existing tunnel boring machine hob wear monitoring device and method, it is difficult to realize accurate and comprehensive identification and evaluation of tunnel boring machine hob wear information. Monitoring system and method

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