CN-216691176-U - Full-face tunnel boring machine scraper abrasion detection device

CN216691176UCN 216691176 UCN216691176 UCN 216691176UCN-216691176-U

Abstract

A full-face tunnel boring machine scraper abrasion detection device comprises a probe, a relay, a wireless signal transmitter, a wireless signal receiver and an alarm device; the probe comprises a thin-wall metal pipe installed in a scraper in a threaded connection mode, the front end of the metal pipe is located at the abrasion limit position of the scraper, a U-shaped insulated wire with two ends extending out of the opening end of the metal pipe is embedded in the metal pipe through insulating resin, the bent end of the insulated wire is attached to the inner wall of the blind end of the metal pipe, the insulated wire controls an alarm device through a relay, a wireless signal transmitter and a receiver, and the insulated wire is disconnected and the alarm device is connected to send an alarm signal. The detection device is used for detecting the abrasion of the scraper, so that the influence of the external environment can be better avoided, and the detection accuracy is ensured; the device has simple structure and simple and convenient operation, can detect under the dynamic condition, does not need to open a cabin for inspection, and can accurately judge the scraper which is worn to the limit and needs to be replaced through the alarm device in the control room.

Inventors

WANG HE
WANG YANXIANG
WEI JUNKUN
WEN KAIXIANG
JIN YIFAN

Assignees

SHENYANG BUILDING UNIV

Dates

Publication Date: 20220607
Application Date: 20220125
Priority Date: 20220125

Claims (4)

1. A full-face tunnel boring machine scraper abrasion detection device is characterized by comprising a probe, a relay, a wireless signal transmitter, a wireless signal receiver and an alarm device; the probe comprises a thin-wall metal pipe which is installed in the scraper in a threaded connection mode, the front end of the metal pipe is located at the abrasion limit position of the scraper, a U-shaped insulated conducting wire with two ends extending out of the opening end of the metal pipe is buried in the metal pipe through an insulated filler, the bent end of the insulated conducting wire is attached to the inner wall of the blind end of the metal pipe, and the insulated conducting wire is connected with an input end interface of the relay; the relay output end interface is connected with the wireless signal transmitter; the wireless signal receiver is connected with the alarm device; when the insulated conductor is disconnected, the relay acts, the wireless signal emitter emits signals, the wireless signal receiver receives the signals and then switches on the alarm device, and the alarm device sends out alarm signals.
2. The full face tunnel boring machine scraper abrasion detecting device according to claim 1, wherein the metal pipe is a steel pipe having a thickness of 2mm and an external thread on an outer surface; the insulated wire is an enameled wire with the diameter of 0.56mm, and two tail ends of the enameled wire are respectively connected with the probe contact; the insulation filler is insulation resin; the probe contact is exposed from the open end of the steel pipe and fixed by the solidified insulating resin.
3. The full-face tunnel boring machine scraper abrasion detection device according to claim 1 or 2, characterized IN that the relay is an SRD-12DVC-SL-C relay, the DC + and DC-terminals of the relay are respectively connected with the positive and negative electrodes of a power supply through an optical coupling isolation relay driving module, the DC + and IN terminals are respectively connected with two probe contacts, and the COM and NC terminals are connected with a wireless signal transmitter.
4. The full face tunnel boring machine scraper wear detection device of claim 1, wherein the alarm device is a light alarm device.

Description

Full-face tunnel boring machine scraper abrasion detection device Technical Field The utility model relates to wear detection of a cutter of a tunnel boring machine, in particular to a wear detection device of a cutter of a full-face tunnel boring machine. Background The full-face tunnel boring machine is generally applied to construction engineering of various large tunnels at present, and abrasion of a scraper of the full-face tunnel boring machine is an important factor influencing a construction process in muddy water mixing and river and sea tunnel construction. In the shield construction process, the consumption of the scraper is large in the whole construction stage, and the inspection and maintenance of the scraper and the replacement of the scraper are very complicated. The abrasion of the scraper is judged by the experience of workers alone and the scraper is opened for tool changing, and two situations often occur because of inaccurate judgment: firstly, the scraper can be changed in advance before being worn to the limit, so that waste is caused; secondly, the scraper is worn and abraded beyond the limit and is not changed in time, so that the whole construction effect is influenced. Therefore, the scraper abrasion detection accuracy is of great significance for saving construction cost and improving construction efficiency. The current scraper abrasion detection methods mainly comprise a hydraulic loop detection method, a peculiar smell inert gas detection method, an ultrasonic abrasion detection method, a parameter analysis method and the like. The hydraulic circuit detection method is mainly characterized in that a hydraulic circuit is arranged in the scraper for detection, when the scraper is worn to the limit, the hydraulic circuit changes, the pressure in the scraper cavity changes, and therefore the wear degree of the scraper is judged. The method is influenced by pipelines and circuit arrangement inside the cutter head and the rotation of the center of the cutter head, and cannot realize simultaneous detection of a plurality of scrapers. The peculiar smell inert gas detection method is to detect that the scraper is worn to the limit by a sensor to release peculiar smell gas so as to judge the abrasion of the scraper, and is difficult to realize especially under the working conditions of mud-water mixing and mainly soil layers due to the complex working environment of the full-face tunnel boring machine scraper. The ultrasonic abrasion detection method can realize real-time monitoring of the abrasion of the scraper, but is affected by the interference of the assembly form of the scraper and other parts when the scraper works, and the detection precision is difficult to guarantee. The parameter analysis method is to analyze the force and moment applied to the scraper according to the existing theoretical basis, or determine a related action relational expression in the tunneling process of the full-face tunnel boring machine by integrating parameters such as the rotating speed and the tunneling speed of a cutter head in the tunneling process of the scraper, and establish a wear prediction model of the scraper of the full-face tunnel boring machine. The parameter analysis method has a large deviation between theory and actual application, and cannot accurately judge whether the abrasion of the scraper reaches the abrasion limit in time. SUMMERY OF THE UTILITY MODEL In order to overcome the defects of the existing scraper abrasion detection method, the utility model provides a scraper abrasion detection device of a full-face tunnel boring machine. The utility model provides a full-face tunnel boring machine scraper abrasion detection device, which comprises a probe, a relay, a wireless signal transmitter, a wireless signal receiver and an alarm device, wherein the probe is connected with the relay; the probe comprises a thin-walled (1-2 mm in wall thickness) metal pipe which is installed in a scraper in a threaded connection mode, the front end of the metal pipe is located at the abrasion limit position of the scraper, a U-shaped insulated wire with two ends extending out of the opening end of the metal pipe is embedded in the metal pipe through an insulated filler, the bent end of the insulated wire is attached to the inner wall of the blind end of the metal pipe, and the insulated wire is connected with an input end interface of the relay; the relay output end interface is connected with the wireless signal transmitter; the wireless signal receiver is connected with the alarm device; when the insulated conductor is disconnected, the relay acts, the wireless signal emitter emits signals, the wireless signal receiver receives the signals and then switches on the alarm device, and the alarm device sends out alarm signals. Further, the metal pipe is a steel pipe with the thickness of 2mm and external threads on the outer surface; the insulated wire is an enameled wire with the diameter of 0.56