Fixing device for in-hole acoustic emission sensor

Abstract

The utility model relates to an in-hole acoustic emission sensor fixing device which comprises an acoustic emission sensor, an acoustic emission sensor coupling device, an air bag, a positioning pipe, a fixing nut and a telescopic rod, the telescopic rod is installed on the lower side of the positioning pipe, the air bag is installed on the upper side of the positioning pipe, and the acoustic emission sensor is installed on the air bag. The acoustic emission sensor is fixedly connected with the acoustic emission sensor coupling device based on the fixing nut, and the acoustic emission sensor coupling device is provided with a plurality of through threaded holes. According to the in-hole acoustic emission sensor fixing device provided by the invention, the acoustic emission sensors are fixed at positions with different depths in the hole, and by adjusting the fixing positions of the acoustic emission sensors, the signal propagation distance is reduced, and part of environmental noise signals are reduced; the signal propagation distance is effectively reduced, the adverse effect of the attenuation effect in the propagation process on waveform recognition is reduced, and the accuracy of waveform recognition is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering monitoring, and particularly relates to a hole acoustic emission sensor fixing device. BACKGROUND

[0002] Rock burst is a sudden disaster frequently occurring in the process of deep underground tunnel excavation, which has extremely strong destructive power and can not only seriously damage the excavation operation surface, but also pose a major threat to the safety of on-site workers. Nowadays, how to effectively prevent the occurrence of rock burst and ensure the safety of construction personnel has become a global challenge that needs to be overcome in the field of rock engineering. Therefore, it is particularly important to monitor the state of the surrounding rock mass of the tunnel in real time and accurately, which not only provides key information for predicting rock burst, but also provides necessary support for protecting the safety of workers.

[0003] According to Kaiser effect and related researches in rock mechanics, a large amount of acoustic emission signals will be released when the rock mass is damaged, and the continuous change of the acoustic emission signals is closely related to the rock mass damage process. The law can be used to predict possible geological disasters. In the actual use of acoustic emission monitoring, researchers have found that the on-site acoustic emission signals are mixed with a large amount of environmental noise signals, and the waveform signal noise reduction and identification are difficult. At the same time, the attenuation effect in the propagation process of the acoustic emission signals brings adverse effects on the waveform identification.

[0004] The in-hole acoustic emission can eliminate a part of the environmental noise signals and reduce the difficulty of waveform signal noise reduction. However, the current in-hole acoustic emission sensor adopts a positioning installation mode, and the installation depth in the hole is fixed. When the signal propagation distance is too large, the attenuation effect in the propagation process brings adverse effects on the waveform identification. CONTENT OF THE UTILITY MODEL

[0005] In order to solve or partially solve the problems in the related art, the present application provides an in-hole acoustic emission sensor fixing device, which adjusts the fixed position of the acoustic emission sensor, reduces the signal propagation distance, and reduces the adverse effects of the attenuation effect in the propagation process on the waveform identification.

[0006] The first aspect of the present application provides an in-hole acoustic emission sensor fixing device, which comprises an acoustic emission sensor, an acoustic emission sensor coupling device, an air bag, a positioning pipe, a fixing nut and an extension rod. The extension rod is installed on the lower side of the positioning pipe, and the air bag is installed on the upper side of the positioning pipe. The acoustic emission sensor is installed on the air bag. The acoustic emission sensor is fixedly connected with the acoustic emission sensor coupling device based on the fixing nut. The acoustic emission sensor coupling device is provided with a plurality of through screw holes.

[0007] Among them, the acoustic emission sensor coupling device is provided with four through screw holes, which are perpendicular to the axial direction of the acoustic emission sensor.

[0008] The acoustic emission sensor is connected with an acoustic emission host through a data transmission line.

[0009] Two through screw holes are arranged on the positioning pipe, and the positioning pipe is connected with the telescopic rod through a fixing nut.

[0010] The air bag surface is provided with an anti-abrasion layer.

[0011] The surface of the acoustic emission sensor coupling device is coated with a coupling agent.

[0012] The technical scheme provided in the application can have the following beneficial effects:

[0013] The application provides a hole acoustic emission sensor fixing device, which can fix the acoustic emission sensor at different depths in the hole, adjust the fixing position of the acoustic emission sensor, reduce the signal propagation distance, reduce part of the environmental noise signals, effectively reduce the signal propagation distance, and reduce the adverse effects of the attenuation effect in the propagation process on the waveform identification, thereby effectively improving the accuracy of the waveform identification.

[0014] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and other objects, features and advantages of the application will become more apparent from the following detailed description of exemplary embodiments of the application taken in conjunction with the accompanying drawings, in which like reference characters refer to the like parts throughout the different views.

[0016] Figure 1 is a structural schematic diagram of the device shown in the embodiments of the application;

[0017] Figure 2 is a schematic diagram of the acoustic emission sensor and the host shown in the embodiments of the application;

[0018] Figure 3 is a schematic diagram of the connection between the positioning pipe and the telescopic rod shown in the embodiments of the application;

[0019] Figure 4 is a schematic diagram of the acoustic emission sensor coupling device shown in the embodiments of the application;

[0020] Reference signs:

[0021] In the figure, 1 is an acoustic emission sensor coupling device, 2 is an acoustic emission sensor, 3 is a data transmission line, 4 is an air pipe, 5 is a telescopic rod, 6 is a positioning pipe, 7 is an air bag, 8 is a fixing nut, and 9 is an acoustic emission host. DETAILED DESCRIPTION

[0022] Embodiments of the present application will be described in more detail with reference to the drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0023] It should be understood that, although the terms "first", "second", "third", etc. can be used in this application to describe various information, these information should not be limited by these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the present application. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0024] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0025] Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] The technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings.

[0027] As Figure 1The illustrated fixing device for an in-hole acoustic emission sensor 2 includes: an acoustic emission sensor 2, an acoustic emission sensor coupling device 1, an airbag 7, a positioning tube 6, a fixing nut 8, and a telescopic rod 5. The positioning tube 6 is a semi-circular PVC pipe with two through-threaded holes at its bottom. The telescopic rod 5 is installed on the lower side of the positioning tube 6 using the fixing nut 8. The telescopic rod 5 allows for flexible adjustment of the monitoring position according to different measurement point requirements, fixing the acoustic emission sensor 2 at different depths within the hole. (Reference) Figure 3 Both the positioning tube 6 and the telescopic rod 5 are provided with through threaded holes, and the fixing nut 8 passes through the through threaded holes to fix the two together.

[0028] An airbag 7 is mounted on the upper side of the positioning tube 6, and is fixed to the positioning tube 6 by adhesive or other connection methods. An air tube 4 is embedded in the tail end of the airbag 7. The distance between the acoustic emission sensor 2 and the borehole wall is controlled by the degree of inflation of the airbag 7. The airbag 7 is a one-way air intake system; air entering through the air tube 4 cannot be expelled from the airbag 7 through the air tube 4. The surface of the airbag 7 is treated with abrasion-resistant rubber to prevent it from being punctured by sharp rocks inside the borehole.

[0029] An acoustic emission sensor 2 is installed on the airbag 7. The acoustic emission sensor 2 is fixedly connected to the acoustic emission sensor coupling device 1 based on the fixing nut 8. The acoustic emission sensor coupling device 1 has four through threaded holes, which are perpendicular to the axial direction of the acoustic emission sensor 2. Figure 4 As shown, the surface of the acoustic emission sensor coupling device 1 is also coated with a coupling agent. The acoustic emission sensor 2 is connected to the acoustic emission host 9 via the data transmission line 3.

[0030] The mounting device for the acoustic emission sensor 2 inside the borehole extends into the measuring point position via a telescopic rod 5. An air pump is used to inflate the air tube 4, and the gas flows through the air tube 4 into the airbag 7, ensuring the acoustic emission sensor 2 is firmly attached to the borehole wall. (Reference) Figure 2 The acoustic emission sensor 2 is connected to the host via the data transmission line 3. The host has multiple acoustic emission sensor 2 interfaces. The host has built-in post-processing software that can filter the frequency of sound waves transmitted from inside the rock by adjusting the audio threshold, filtering out noise outside the threshold. The host's built-in system can store audio within the threshold and can be remotely controlled to copy audio data in the system.

[0031] Finally, it should be noted that in this document, relationships such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "include," "contain," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0032] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0033] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A device for fixing an in-hole acoustic emission sensor, characterized in that, include: The device comprises an acoustic emission sensor, an acoustic emission sensor coupling device, an airbag, a positioning tube, a fixing nut, and a telescopic rod. The telescopic rod is installed on the lower side of the positioning tube, and the airbag is installed on the upper side. The acoustic emission sensor is installed on the airbag. The acoustic emission sensor is fixedly connected to the acoustic emission sensor coupling device based on the fixing nut. The acoustic emission sensor coupling device has multiple through threaded holes.

2. The in-hole acoustic emission sensor fixing device according to claim 1, characterized in that, The acoustic emission sensor coupling device is provided with four through threaded holes, which are perpendicular to the axial direction of the acoustic emission sensor.

3. The in-hole acoustic emission sensor fixing device according to claim 1, characterized in that, The acoustic emission sensor is connected to the acoustic emission host via a data transmission line.

4. The in-hole acoustic emission sensor fixing device according to claim 1, characterized in that, The positioning tube has two through threaded holes, and the positioning tube is connected to the telescopic rod by the fixing nut.

5. The in-hole acoustic emission sensor fixing device according to claim 1, characterized in that, The surface of the airbag is provided with an anti-wear layer.

6. The in-hole acoustic emission sensor fixing device according to claim 1, characterized in that, The surface of the acoustic emission sensor coupling device is coated with a coupling agent.

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