CN109828032B - Prestress rotary wetting acoustic wave sensitivity monitor - Google Patents
Prestress rotary wetting acoustic wave sensitivity monitor Download PDFInfo
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- CN109828032B CN109828032B CN201910135094.6A CN201910135094A CN109828032B CN 109828032 B CN109828032 B CN 109828032B CN 201910135094 A CN201910135094 A CN 201910135094A CN 109828032 B CN109828032 B CN 109828032B
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Abstract
The invention discloses a prestress rotation wetting acoustic wave sensitivity monitor, and particularly relates to the technical field of monitoring of a coal bed wetting interface. The prestress rotary wetting acoustic wave sensitivity monitor comprises an acoustic wave measuring device, an acoustic wave probe clamping device, a sample clamping device, an angle adjusting device and a wetting supply device; the acoustic wave measuring device comprises a wave speed instrument and an acoustic wave probe which are connected, and the acoustic wave probe is used for transmitting acoustic waves to the sample and receiving the acoustic waves; the sample clamping device comprises a sample clamping plate, a prestress probe and a centering clamping slide rail, and the sample is fixed through the sample clamping plate and the prestress probe; the angle adjusting device realizes the deflection of the sample and the sample clamping device through the angle rotating shaft, the rail groove and the fastener; the relation between the change condition of the wetting interface and the change of the wave speed can be accurately determined by the monitor, the clamping force of a sample is adjustable, the clamping stress is the same when multiple times of measurement are guaranteed, and therefore interference to an experimental result when a probe acquires data is eliminated.
Description
Technical Field
The invention relates to the technical field of monitoring of coal bed wetting interfaces, in particular to a prestress rotation wetting acoustic wave sensitivity monitor.
Background
A new acoustic wave envelope monitoring method is developed in the technical field of coal seam water injection laboratory monitoring, and the acoustic wave envelope method is a method for judging a wetting interface by monitoring the wave speed change of acoustic waves of different paths so as to envelope the wetting interface. Since it can be judged by monitoring the wave velocity change that the wetted interface reaches the monitoring path, it is unclear whether the wetted interface passes through the monitoring path or not, and how much distance the wetted interface passes through the monitoring path. Therefore, the wrapped wetting interface data is inaccurate, and the relation between the sensitivity of the wetting wave speed needs to be researched so as to correct the wetting interface data. Since the wetting in coal rock has directional anisotropy and is easily affected by size, it is very necessary to conduct related research. However, the existing experimental equipment applicable to the research is few, and when the acoustic wave monitoring is adopted, the clamping force of the probe has certain influence on the experimental result.
Disclosure of Invention
The invention aims to overcome the defects and provides a stress rotation wetting acoustic wave sensitivity monitor which can monitor wave speed sensitivity of test pieces with multiple sizes and multiple wetting directions and eliminate interference of clamping force on experimental results through prestress clamping.
The invention specifically adopts the following technical scheme:
the prestress rotary wetting acoustic wave sensitivity monitor comprises an acoustic wave measuring device, an acoustic wave probe clamping device, a sample clamping device, an angle adjusting device and a wetting supply device;
the acoustic wave measuring device comprises a wave velocity instrument and an acoustic wave probe which are connected, and the acoustic wave probe is used for transmitting acoustic waves to the sample and receiving the acoustic waves;
the acoustic wave probe clamping device comprises a cylindrical bracket, the acoustic wave probe is placed in the cylindrical bracket, and the tail of the acoustic wave probe is connected with the cylindrical bracket through a spring;
the sample clamping device comprises a sample clamping plate, a prestress probe and a centering clamping slide rail, and the sample is fixed through the sample clamping plate and the prestress probe;
the angle adjusting device comprises an angle rotating shaft, a rail groove and a fastener, and deflection of the sample and the sample clamping device is realized through the angle rotating shaft, the rail groove and the fastener;
the wetting supply device comprises a measuring flask, a heat shrinkable tube and water guide fibers, wherein the heat shrinkable tube fixedly seals the bottom of the sample, the water guide fibers are filled in a cavity formed by the sample and the heat shrinkable tube, the end surface of the sample connected with the heat shrinkable tube is used as a wetting surface, and the water guide fibers guide the water in the measuring flask into the bottom of the sample in a self-absorption manner.
Preferably, the sound wave probe clamping device further comprises a sound absorption sponge and a horizontal centering position adjusting device, wherein the sound absorption sponge is padded between the sound wave probe and the cylindrical bracket and is used for preventing the sound wave probe from being interfered by the outside.
Preferably, the bottom of the cylindrical bracket is connected with the probe centering slide rail, the probe horizontal slide rail and the measuring platform through the probe bracket, and the probe centering slide rail and the probe horizontal slide rail are used for clamping the sound wave probe at the sample.
Preferably, the sample clamping plate is connected with a centering clamping slide rail for adjusting and clamping the sample, and the centering clamping slide rail is connected with a fastener.
Preferably, the sample is aligned in a plane reference center, and the alignment of the multi-size sample and the center of the acoustic wave probe can be realized.
Preferably, the angle adjusting device further comprises a single-shaft bracket for realizing deflection adjustment of the sample and the sample clamping device.
Preferably, the device also comprises a frame body, and the acoustic wave measuring device, the acoustic wave probe clamping device, the sample clamping device and the angle adjusting device are fixed on the frame body.
Preferably, the first and second electrodes are formed of a metal,
placing a test piece at a sample clamping plate, placing water guide fibers at the lower part of the test piece, sealing the test piece by using a heat shrinkable tube, adjusting a centering clamping slide rail to clamp the test piece, placing the water guide fibers into a measuring flask, and placing the measuring flask and the test piece at the same horizontal position;
adjusting a probe centering slide rail and a probe horizontal slide rail to clamp the acoustic probe on the sample, adjusting the centering clamping slide rail to enable a sample clamping plate to clamp the sample, then adjusting the angle of the measuring platform, and fastening by a fastener;
measuring data through an acoustic wave measuring device, calculating the measured data to obtain the wetting distance of a single position, and finally connecting the wetting distances of a plurality of groups of single positions into a curve, namely a theoretical calculation inversion wetting profile surface; and cutting the test piece, obtaining a real wetting profile surface through thermal imaging scanning, comparing the theoretically-calculated and inverted wetting profile surface with the real wetting profile surface, and judging whether the wetting profile surface calculated by the acoustic emission inversion method is accurate or not.
The invention has the following beneficial effects:
the monitor determines the wave velocity change of the hydrous coal rock test piece by adopting a sound wave method, thereby determining the relation between the change condition of a wetting interface and the wave velocity change, the clamping force can be adjusted by clamping a prestress probe, and the clamping stress can also be ensured to be the same when measuring for many times, thereby eliminating the interference to the experimental result when the probe acquires data, the wetting sensitivity in different directions can be researched by adjusting the wetting directions in multiple angles, the test pieces with various shapes and sizes can be researched by clamping the test pieces with various sizes, the sensor is always positioned at the central position of the test piece by centering the surface center, and the measured data is more representative.
Drawings
FIG. 1 is a front view of a pre-stressed rotary wetting acoustic wave sensitivity monitor, particularly illustrating the front view internal structure of the monitor;
FIG. 2 is a side view of the structure of a prestressed rotary wetting acoustic wave sensitivity monitor, particularly illustrating the side view internal structure of the monitor;
FIG. 3 is a side view of a pre-stressed rotational wetting acoustic sensitivity monitor configuration showing in particular the monitor's side view outer profile.
Wherein, 1 is the support body, 2 is the angle rotation axle, 3 is the rail groove, 4 is probe horizontal slide rail, 5 is measuring platform, 6 is probe centering slide rail, 7 is probe bracket support groove, 8 is inhales the sound sponge, 9 is the sound wave probe, 10 is cylindrical support groove, 11 is the sample, 12 is the sample splint, 13 is the graduated flask, 14 is the pyrocondensation pipe, 15 is the water guide fibre, 16 is the tight slide rail of heart clamp, 17 is the binding.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1-3, the monitor for sensitivity of acoustic wave by prestress rotation wetting comprises a frame body 1, an acoustic wave measuring device, an acoustic wave probe clamping device, a sample clamping device, an angle adjusting device and a wetting supply device, wherein the acoustic wave measuring device, the acoustic wave probe clamping device, the sample clamping device and the angle adjusting device are fixed on the frame body, and the wetting device conveys water to a test piece through water guide fibers to wet the test piece;
the acoustic wave measuring device comprises a wave speed instrument and an acoustic wave probe 9 which are connected, wherein the acoustic wave probe 9 is used for transmitting acoustic waves to the sample and receiving the acoustic waves;
the acoustic wave probe clamping device comprises a cylindrical bracket 10, an acoustic wave probe 9 is placed in the cylindrical bracket 10, and the tail of the acoustic wave probe 9 is connected with the cylindrical bracket 10 through a spring; the sound wave probe clamping device further comprises a sound absorption sponge 8 and a horizontal centering position adjusting device, the sound absorption sponge 8 is padded between the sound wave probe 9 and the cylindrical bracket 10, and the sound absorption sponge is used for preventing the sound wave probe from being interfered by the outside.
The sample clamping device comprises a sample clamping plate 12, a prestress probe and a centering clamping slide rail 16, and the sample is fixed through the sample clamping plate and the prestress probe;
the angle adjusting device comprises an angle rotating shaft 2, a rail groove 3 and a fastener 17, and deflection of the sample and the sample clamping device is realized through the angle rotating shaft 2, the rail groove 3 and the fastener 17;
the wetting supply device comprises a measuring flask 13, a heat shrinkable tube 14 and water guide fibers 15, wherein the heat shrinkable tube 14 fixes and seals the bottom of the sample, the water guide fibers 15 are fully filled in a cavity formed by the sample and the heat shrinkable tube 14, the end face of the sample connected with the heat shrinkable tube is used as a wetting surface, and the water guide fibers guide water in the measuring flask into the bottom of the sample by self absorption.
The bottom of the cylindrical bracket 10 is connected with a probe centering slide rail 6, a probe horizontal slide rail 4 and a measuring platform 5 through a probe bracket 7, and the probe centering slide rail 6 and the probe horizontal slide rail 4 are used for clamping the sound wave probe 9 at a sample.
The sample clamping plate 12 is connected with a centering clamping slide rail 16 for adjusting and clamping a sample, and the centering clamping slide rail 16 is connected with a fastener 17.
The sample 11 adopts plane reference centering alignment, and can realize the centering alignment of the multi-size sample and the acoustic wave probe.
The angle adjusting device also comprises a single-shaft support for realizing deflection adjustment of the sample and the sample clamping device.
Placing a test piece 11 at a sample clamping plate 12, placing water guide fibers 15 at the lower part of the sample, sealing the sample by using a heat shrinkable tube 14, adjusting a centering clamping slide rail 16 to clamp the sample, placing the water guide fibers into a measuring flask, and placing the measuring flask and the sample at the same horizontal position;
adjusting a probe centering slide rail 6 and a probe horizontal slide rail 4 to clamp the acoustic probe 9 on the sample, adjusting a centering clamping slide rail 16 to enable a sample clamping plate to clamp the sample, then adjusting the angle of the measuring platform, and fastening by a fastener;
measuring data through an acoustic wave measuring device, calculating the measured data to obtain the wetting distance of a single position, and finally connecting the wetting distances of a plurality of groups of single positions into a curve, namely a theoretical calculation inversion wetting profile surface; and cutting the test piece, obtaining a real wetting profile surface through thermal imaging scanning, comparing the theoretically-calculated and inverted wetting profile surface with the real wetting profile surface, and judging whether the wetting profile surface calculated by the acoustic emission inversion method is accurate or not.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (8)
1. The prestress rotation wetting acoustic wave sensitivity monitor is characterized by comprising an acoustic wave measuring device, an acoustic wave probe clamping device, a sample clamping device, an angle adjusting device and a wetting supply device;
the acoustic wave measuring device comprises a wave velocity instrument and an acoustic wave probe which are connected, and the acoustic wave probe is used for transmitting acoustic waves to the sample and receiving the acoustic waves;
the acoustic wave probe clamping device comprises a cylindrical bracket, the acoustic wave probe is placed in the cylindrical bracket, and the tail of the acoustic wave probe is connected with the cylindrical bracket through a spring;
the sample clamping device comprises a sample clamping plate, a prestress probe and a centering clamping slide rail, and the sample is fixed through the sample clamping plate and the prestress probe;
the angle adjusting device comprises an angle rotating shaft, a rail groove and a fastener, and deflection of the sample and the sample clamping device is realized through the angle rotating shaft, the rail groove and the fastener;
the wetting supply device comprises a measuring flask, a heat shrinkable tube and water guide fibers, wherein the heat shrinkable tube fixedly seals the bottom of the sample, the water guide fibers are filled in a cavity formed by the sample and the heat shrinkable tube, the end surface of the sample connected with the heat shrinkable tube is used as a wetting surface, and the water guide fibers guide the water in the measuring flask into the bottom of the sample in a self-absorption manner.
2. The monitor of claim 1, wherein the sonic probe holder further comprises a sound absorbing sponge and a horizontal centering position adjustment device, the sound absorbing sponge is padded between the sonic probe and the cylindrical bracket, and the sound absorbing sponge is used to prevent the sonic probe from being interfered by the outside.
3. The monitor of claim 1, wherein the bottom of the cylindrical bracket is connected to the probe centering rail, the probe horizontal rail and the measuring platform through the probe bracket, and the probe centering rail and the probe horizontal rail are used for clamping the sonic probe at the sample.
4. The monitor of claim 1 wherein the sample clamping plate is coupled to a centering clamping rail for adjusting clamping of the sample, the centering clamping rail being coupled to a fastener.
5. The monitor of claim 1 wherein the alignment of the sample using a planar datum alignment enables centering of the multi-sized sample with the acoustic probe.
6. The monitor of claim 1, wherein the angle adjustment means further comprises a single axis mount for effecting deflection adjustment of the sample and the sample holder.
7. The monitor of claim 1, further comprising a frame, the sonic measuring device, the sonic probe holder, the sample holder, and the angle adjuster being secured to the frame.
8. The monitor according to any one of claims 1-7, wherein,
placing a test piece at a sample clamping plate, placing water guide fibers at the lower part of the test piece, sealing the test piece by using a heat shrinkable tube, adjusting a centering clamping slide rail to clamp the test piece, placing the water guide fibers into a measuring flask, and placing the measuring flask and the test piece at the same horizontal position;
adjusting a probe centering slide rail and a probe horizontal slide rail to clamp the acoustic probe on the sample, adjusting the centering clamping slide rail to enable a sample clamping plate to clamp the sample, then adjusting the angle of the measuring platform, and fastening by a fastener;
measuring data through an acoustic wave measuring device, calculating the measured data to obtain the wetting distance of a single position, and finally connecting the wetting distances of a plurality of groups of single positions into a curve, namely a theoretical calculation inversion wetting profile surface; and cutting the test piece, obtaining a real wetting profile surface through thermal imaging scanning, comparing the theoretically-calculated and inverted wetting profile surface with the real wetting profile surface, and judging whether the wetting profile surface calculated by the acoustic emission inversion method is accurate or not.
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