CN204405605U - Damage of rock test acoustic emission test sensor monoblock type locating device - Google Patents

Abstract

The utility model discloses an integral positioning device for an acoustic emission test sensor for rock damage testing, which comprises a positioning device frame, an acoustic emission test sensor mounting seat, a fixing component for fixing the acoustic emission test sensor in the mounting seat, and mounting the mounting seat The installation mechanism on the frame of the positioning device, the frame of the positioning device is an integral ring frame; the mounting seat is a cylinder structure whose inner cavity matches the outer edge of the acoustic emission test sensor, and the sensor wiring lead-out gap is designed on the cylinder wall The installation mechanism is an installation mechanism that can automatically adjust the position of the mounting seat in the axial direction, and there are four sets in total, which are located in the same section plane of the positioning device frame. The utility model overcomes the problem that the existing fixing device cannot guarantee that the center of the sensor end plane is tangent to the cylindrical surface, and the axial direction of the sensor end plane center does not coincide with the diameter of the cylindrical test piece, and improves the test efficiency, accuracy and authenticity .

Description

Integral positioning device for acoustic emission testing sensor for rock damage testing

technical field

The utility model relates to the technical field of mechanical testing of rock, concrete and other material test pieces, in particular to an acoustic emission test sensor fixing device used in the damage test of rock, concrete and other material test pieces.

Background technique

In the rock mechanics test, when testing the acoustic emission characteristics in the rock damage process, there is no special fixing device for the acoustic emission testing sensor used. At present, the test generally adopts two fixing methods of tape winding or rubber band binding. The diameter of the acoustic emission test sensor is usually between 5mm-15mm. During the test, in order to better couple the acoustic emission test sensor with the tested object, it is usually necessary to use butter or vaseline as a coupling agent and apply it to the end of the acoustic emission test sensor between the plane and the test piece. However, these measures cannot guarantee the parallelism between the end plane of the acoustic emission test sensor and the coupling surface of the test piece and the good coupling with the test piece, especially the irregular shape of the test piece is difficult to fix. Furthermore, couplants such as butter or vaseline can easily lead to a decrease in adhesiveness or failure of the adhesive tape, and during the radial expansion and deformation of the test specimen, the adhesive tape is likely to form a large constraint on the acoustic emission test sensor, increasing the force on it, and even Make it cause some damage; although the rubber band binding is stretched during the radial expansion deformation of the sample, it can be deformed to a certain extent, but this fixing method can easily cause the acoustic emission test sensor to roll over, and it is difficult to ensure that the acoustic emission test sensor is consistent with the tested sensor. good contact with the parts. In addition, the above two fixing methods need to be carried out before the test preload, and cannot be adjusted during the test, and it is extremely difficult to accurately align the acoustic emission test sensor. The above two fixing methods also have the following problems: (1) It is difficult to ensure the consistency of the force of the acoustic emission test sensor in the test of the same batch of test pieces, and it is easy to form more false signals during the test, which is difficult for the analysis of the test results. , Judgment caused great difficulties. (2) It is extremely inconvenient to install other deformation test sensors.

In order to overcome the above problems, the inventor has successively researched and developed an acoustic emission test sensor fixture (ZL200910059594.2) and a universal acoustic emission test sensor fixture (ZL200910059593.8). The basic structures of the two fixtures are: The two bases for installing the acoustic emission test sensors are respectively installed on the free ends of the cantilever rods fixedly connected to the two ends of the connecting rod, and the end surfaces of the two acoustic emission test sensors installed on the free ends of the cantilever rods are parallel to each other. In the use of these two kinds of acoustic emission test sensor fixing devices, the inventor finds that they cannot well solve the problem proposed by the invention. The reason is that the deformation of the specimen has been changing from the beginning of loading to the failure of the entire test process during the test, and the acoustic emission test sensor at the free ends of the two arms where the sensor is installed, due to the fact that the two ends of the connecting rod The connection length of the fixed connection cantilever rod is fixed during the whole test of the specimen, which will cause the end face of the sensor to change from the initial parallel state to the non-parallel "eight sub" state, which will cause the sensor end plane The effectiveness of the coupling between the center and the center of the specimen is reduced, which affects the accuracy of the test. For cylindrical sample specimens, it is difficult to ensure that the position of the sensor is just right so that the center of the sensor end plane passes through the diameter of the specimen, that is, the contact part between the sensor end plane and the cylinder surface of the cylindrical specimen is difficult to ensure that it is the exact center of the sensor end plane , and the center of the end plane of the sensor is the effective part of signal monitoring. Since the center of the end plane of the sensor fails to be in effective contact with the test piece, the measurement signal is inaccurate, and even the signal cannot be measured. Although the universal acoustic emission test sensor fixture disclosed in ZL200910059593.8 can adjust the direction of the sensor end plane, it is still difficult for the test personnel to ensure that the center of the adjusted sensor end plane is in effective contact with the surface of the test piece in actual operation, let alone Ensure that the line connecting the plane centers of the two symmetrical sensor ends after adjustment passes through the diameter of the specimen or the center of the section, and will cause inconsistencies with the setting positions in the control software, so the success of the test and the reliability of the results cannot be fully guaranteed. Since the position of the sensor is set in the control software, the cylindrical test piece just passes through the diameter of the test piece, and the square test piece just passes through the center of the cross section. The settings are consistent, which leads to inaccurate measured results, which are quite different from the actual ones.

Contents of the invention

Aiming at the deficiencies of the existing acoustic emission test sensor fixing device, the purpose of this utility model is to provide a new structure of an acoustic emission test sensor integral positioning device for rock damage testing, so as to ensure the placement position of the acoustic emission test sensor Make the center direction of the sensor end plane just pass through the diameter of the circular test piece or the center of the rectangular test piece, and ensure that it is consistent with the position set in the control software, so as to improve the test efficiency, test accuracy and authenticity.

The utility model provides an integral positioning device for an acoustic emission test sensor for rock damage testing, which mainly includes a positioning device frame, a mounting seat for installing the acoustic emission testing sensor, a fixing assembly for fixing the acoustic emission testing sensor in the mounting seat, and an installation The seat is installed on the mounting mechanism of the positioning device frame; the positioning device frame is an integral ring structure frame; the mounting seat is a cylinder structure whose inner cavity matches the outer edge of the acoustic emission test sensor, and the wall of the cylinder is designed for The gap leading out from the sensor wiring; the installation mechanism is an installation mechanism that can automatically adjust the position of the mounting seat in the axial direction. There are four sets in total, located in the same section plane of the positioning device frame, and the two are arranged facing each other. The two installation positions are perpendicular to each other. Make the line connecting the plane centers of the two opposite transmitting sensor ends installed on the frame of the positioning device through the mounting seat and the mounting frame pass through the diameter of the test piece or the center of the cross section of the test piece.

In the above technical solution of the present utility model, the frame of the positioning device can be a whole circular ring frame or a rectangular ring frame, and for a cylindrical test piece, the frame of the positioning device can be a circular ring frame or a Rectangular ring frame. For rectangular specimens, the positioning device frame generally adopts a rectangular ring frame.

In the above-mentioned technical solution of the utility model, the fixing assembly can be designed to be composed of an open ring spring piece that hoops the acoustic emission test sensor on the mounting seat and a locking structure that locks the opening of the open ring spring piece , can also be designed into other structural forms. The locking structure may adopt a buckle locking structure, a bolt and nut locking structure or other locking structures.

In the above-mentioned technical solution of the present utility model, as the said cylindrical body of mounting seat, the notch designed on the wall of the cylindrical body is not only used as a notch for sensor wiring to lead out, but also for fixing the acoustic emission test sensor on the The structure in the mounting seat, the notch of the cylinder is also a part of the fixed structure. The notch of the cylinder should not be too large, and the notch angle is generally not greater than 120 degrees.

In the above-mentioned technical solution of the present utility model, the installation mechanism can preferably be designed as follows: comprising a sliding rod fixedly connected with the mounting seat, sleeved outside the sliding rod, one end acts on the mounting seat, and the other end acts on the positioning device frame The spring on the inner wall and the support fixed on the outer wall surface of the positioning device frame, the support is a guide cylinder structure support, fixedly arranged perpendicular to the outer wall surface of the positioning device frame, the inner diameter cooperates with the outer diameter of the sliding rod to form a sliding pair, The sliding rod is axially slidably installed in the guide cylinder through the installation hole on the frame of the positioning device, and the sliding rod protruding outside the guide cylinder is designed with a limit structure for restricting the axial sliding of the sliding rod.

In the above-mentioned installation mechanism, the limit structure that limits the inward sliding position of the slide rod can be designed as a screw nut limit structure composed of threads on the slide rod and matching nuts, or can be designed as a screw nut limit structure composed of threads on the slide rod. The pin hole and the matching pin constitute the pin hole pin limit structure, or other structural forms; the guide cylinder used as the mounting support, and the fixing of the frame wall of the positioning device can be fixed by welding or threaded pairs. Fixed; the way of fixed connection between the sliding rod and the mounting seat of the acoustic emission test sensor can be welded connection or threaded pair connection.

In the above-mentioned technical solution of the present utility model, in order to facilitate the layout of the wiring of the acoustic emission testing sensor, slots for leading the wiring of the acoustic emission testing sensor can be designed on the frame of the positioning device.

The integral positioning device of the acoustic emission test sensor for rock damage testing provided by the utility model is the acoustic emission test sensor fixing device (ZL200910059594.2) and the universal acoustic emission test sensor fixing device (ZL200910059593.8) previously proposed by the inventor. ) in the actual use process, it is found that for cylindrical sample specimens, it is not only difficult to ensure that the fitting part of the sensor and the specimen is the center of the sensor end plane, but also difficult to ensure that the placement position is just so that the center of the sensor end plane passes through the diameter of the specimen, while The position of the sensor is set in the control software to have an accurate position, that is, for a cylindrical test piece, it just passes through the diameter of the test piece, and for a square test piece, it just passes through the center of the cross section. Since it is difficult to ensure that the fixture is installed, the center position of the plane of the transmitter sensor end It is consistent with the position set in the control program, which leads to inaccurate measured results and large differences from the actual situation.

The utility model provides an integral positioning device for acoustic emission testing sensors for rock damage testing, by installing four sets of mounting mechanisms that can automatically adjust the position of the mounting seat axially in two directions perpendicular to each other on the same sectional plane of the frame of the integral annular positioning device , not only ensures that the joint between the acoustic emission test sensor installed in the mounting seat and the cylinder surface of the cylindrical specimen is always the center of the sensor end plane, but also ensures that the sensor installation position is consistent with the position set in the control program, that is, two by two The center of the end plane of the four acoustic emission test sensors installed symmetrically just passes through the diameter of the cylindrical specimen or the center of the section of the rectangular specimen, which not only can obtain as much measurement information as possible during the test of the same specimen, but also ensures that the test When installing and testing components, the center position of the launch sensor end plane is consistent with the position set in the control program, thus ensuring test efficiency, test accuracy and authenticity. The fixing device provided by the utility model can not only ensure that the sensor installation position is consistent with the program setting position, but also ensure that the sensor position is always at a predetermined position during the application of the coupling agent, and ensure that the center of the sensor end plane is in a good coupling state with the test piece. No. ZL200910059594.2 fixing device and ZL200910059593.8 fixing device previously disclosed by the inventor, although the coupling agent can be applied before or after the acoustic emission test sensor is installed on the test piece, it is possible to make the center of the emission sensor end plane and the test piece In a good coupling state, get accurate and true test information, but whether you apply it before installation or after installation, you can't do it well. Applying before installation can neither ensure that the center line of the two installed sensor emission planes passes through the diameter of the cylindrical test piece or the center of the rectangular test piece section, nor can it ensure that the position of the sensor and the cylindrical surface of the cylindrical test piece is the sensor The center of the sensor; coating after installation will cause the installation position of the sensor to change during the coating process, which will not only make the contact between the sensor and the test piece not the center of the sensor, but also make the two sensors deviate from the predetermined position, which is different from the setting in the control program. Inconsistent. Both methods of smearing will lead to inaccurate test results or ineffective testing.

The installation mechanism specially designed in this utility model is a kind of installation mechanism that can automatically adjust the position of the installation seat in the axial direction. Keeping close contact with the surface of the test piece also ensures that when the test piece expands radially during the test, the force on the acoustic emission test sensor will not be increased, and at the same time it can ensure that the acoustic emission test sensor is under pressure during the test of the same batch of test specimens. Consistency of force. This not only reduces the impact of false signals on test results, but also improves the service life of the acoustic emission test sensor. In the fixing device previously disclosed by the inventor, since the two parallel cantilever bars that fix the two acoustic emission test sensors are connected together by a connecting rod, when the two acoustic emission testing sensors are installed on the test piece, the connecting rod is located at On one side of the specimen, when the specimen is suddenly broken during the test, the whole composed of the fixture and the two acoustic emission test sensors will swing to the side where the connecting rod is located, and this side may hit the loading frame of the testing machine, causing the sensor to damage or loss of test accuracy. Because the utility model has an integral structure, it is placed outside the test piece during the test. When the test piece breaks suddenly, the fixing device will be suspended in the mid-air of the test, which can avoid hitting the testing machine, thereby protecting the sensor more effectively.

During the testing process of the test piece, the deformation of the test piece has been changing from the beginning of loading to the whole test process of failure. The fixing device disclosed by the inventor, due to the installation of the two arms of the sensor, will change from the initial parallel state , changing to a non-parallel "eight sub" state, resulting in a decrease in the effectiveness of the coupling between the center of the transmitting sensor end plane and the center of the specimen, affecting the accuracy of the test. The sensor of the utility model is installed on the positioning device frame of the overall rigid ring structure through the mounting seat and the mounting mechanism. During the deformation process of the test piece, the sliding rod fixedly connected with the sensor can be freely expanded and contracted in the guide cylinder as the mounting support. , due to the action of the spring sleeved outside the sliding rod, the test sensor and the tested object are always in the optimal coupling state, which overcomes the above-mentioned defects in the prior art fixing device. The fixing device of the utility model also has the advantages of the fixing device previously disclosed by the inventor (except any adjustment of the universal type).

Use the acoustic emission test sensor integrated positioning device for rock damage testing provided by the utility model to test the test piece, which can ensure that the center of the end plane of the acoustic emission test emission sensor passes through the diameter of the test piece or the center of the test piece in the axial direction, and the sensor emission plane is in line with the test piece center. The coupling part of the cylindrical surface of the test piece is always the center of the emission sensor end plane, and the four sensors on the same section are always at the same height, which overcomes the fact that the center of the acoustic emission test sensor plane is tangent to the cylindrical surface during the artificial installation of the test piece, and Acoustic emission test The problem that the central axis of the end plane of the emission sensor does not coincide with the diameter of the cylindrical specimen to be tested. At the same time, the utility model can always ensure that the emission planes of the two acoustic emission test sensors are parallel, and their axial directions are completely coincident.

Description of drawings

Fig. 1 is a top view structural diagram of an embodiment of the utility model.

FIG. 2 is a schematic cross-sectional structural schematic diagram of the front view of the fixing device shown in FIG. 1 .

Fig. 3 is a schematic top view of an embodiment of the utility model.

Fig. 4 is a structural schematic diagram of the connection relationship between the sensor mount and the sliding rod.

FIG. 5 is a schematic top view of the structure of FIG. 4 .

Fig. 6 is a structural schematic diagram of a fixing method for fixing the sensor on the mounting base.

Fig. 7 is a structural schematic diagram of another fixing method for fixing the sensor on the mounting base.

The objects identified by the labels in the above drawings are: 1-positioning device frame; 2-installation support; 3-sliding rod; 4-limit nut; 5-spring; 6-sensor mounting seat; 8-bayonet; 9-sensor wiring; 10-sensor wiring external lead groove; 11-acoustic emission test sensor; 12-tested piece, 13-locking bolt.

Detailed ways

The integrated positioning device for the acoustic emission test sensor used in the rock damage test of the present invention will be further described through the examples below in conjunction with the accompanying drawings. It should be pointed out that the specific implementation of the present invention is not limited to the form described in the examples. .

Example 1

The integral positioning device for the acoustic emission testing sensor for rock damage testing in this embodiment has a structure as shown in accompanying drawings 1, 2, 4, 5 and 6, the test piece is a cylindrical rock specimen, and the positioning device consists of An annular positioning device frame 1, a mounting seat 6 for installing the acoustic emission test sensor 11, a fixing assembly for fixing the acoustic emission testing sensor in the mounting seat 6, and a mounting mechanism for installing the mounting seat 6 on the positioning device frame. The mounting seat is a cylinder whose inner cavity matches the outer edge of the acoustic emission test sensor and one end is closed. The wall of the cylinder body is designed with a sensor wiring lead-out gap, and the angle of the gap is 90 degrees; the acoustic emission test sensor is fixed in the mounting seat 6 The fixing assembly is composed of an open annular spring piece 7 that hoops the acoustic emission test sensor on the mounting seat and a locking structure 8 that locks the opening of the open annular spring piece, and the locking structure is a buckle locking Structure; the installation mechanism is an installation mechanism that can automatically adjust the position of the mounting seat in the axial direction, including a sliding rod 3 fixedly connected to the bottom end of the cylinder as the acoustic emission test sensor mounting seat 6, sleeved outside the sliding rod, and one end acts The spring 5 acting on the inner wall of the positioning device frame at the bottom end of the cylinder and the other end and the mounting support 2 fixedly arranged on the outer wall surface of the positioning device frame, the mounting support is a guide cylinder support, and is vertically installed and fixed by a thread Outside the frame wall of the positioning device, its inner diameter cooperates with the outer diameter of the sliding rod to form an axial sliding pair. The rod protruding outside the guide cylinder of the mounting support is designed with a limit structure that limits the axial sliding of the slide rod. The limit structure is composed of threads on the slide rod and a limit nut 4 that matches it. Limit the axial sliding position of the sliding rod. There are four installation mechanisms, which are located in the same sectional plane of the positioning device frame, and are arranged in pairs opposite to each other, and the connecting lines of the two installation positions formed by the arrangement of the installation mechanisms in pairs facing each other are perpendicular to each other.

The method of using the integrated positioning device for the acoustic emission test sensor for rock damage testing provided by the utility model to test the rock specimen:

1. According to the diameter (or side length) of the rock test piece to be tested, and the diameter of the rock test piece to be tested and the amount of deformation that may occur when it is damaged, select an appropriate length of the spring 5 . The four acoustic emission test sensors 11 are respectively fixedly installed in the cylinder as the mounting seat in the fixing device. Adjust the upper limit nut of the sliding rod of the installation mechanism, so that the spring 5 sleeved on the sliding rod 3 of the installation mechanism is always in a compressed state during the whole test process of the rock specimen, so as to ensure that the center of the end plane of the acoustic emission sensor is in line with the tested rock test. Effective contact with the surface of the part. When adjusting the limit nut 4, it should be noted that the springs on the sliding rods should be compressed in the same amount by the relative installation mechanisms respectively fixing the mounting seats of the acoustic emission test sensors. In addition, when the acoustic emission test sensor after adjusting the position of the limit nut 4 is placed on the tested piece, the limit nut 4 should be between the free end of the sliding screw 3 and the free end of the guide cylinder as the installation support 2 , and cannot be close to the free end of the guide cylinder, this setting is to ensure that during the deformation of the rock specimen, when the rock decreases laterally, that is, when the rock diameter (or side length) decreases, the acoustic emission test The sensors can move toward each other under the action of the spring force; when the rock increases laterally, that is, the diameter (or side length) of the rock increases, the two opposite acoustic emission test sensors will compress the spring under the deformation of the rock and deviate from each other. sports.

2. Fix the lead wires of the acoustic emission test sensor with the adjusted distance and the position of the limit nut respectively in the external lead grooves 10 of the acoustic emission test sensor wiring adjacent to the sensor.

3. Install other test sensors according to the test situation, and then fix the acoustic emission test sensor near the end of the test piece.

4. Place the test piece with the acoustic emission test sensor installed on the testing machine for testing.

After being installed according to the above method, when the test piece expands laterally, the distance between the two oppositely arranged test sensor end planes in the device can change slightly by relying on the spring 5, and it is close to the surface of the test piece, and is always maintained. The initial parallel state ensures the accuracy and authenticity of the measurement signal.

Example 2

The structure of the integrated positioning device for acoustic emission testing sensors for rock damage testing in this embodiment is shown in Figures 2, 3, 4, 5 and 7, and the test piece is a rectangular rock test piece. The structure of the positioning device of this embodiment is basically the same as that of the positioning device described in Embodiment 1. The difference is that the frame of the positioning device in the positioning device of this embodiment is an integral ring structure frame; The acoustic emission test sensor is fixed to the fixing assembly in the mounting seat 6, wherein the locking structure for locking the opening of the open ring spring piece 7 is a bolt and nut locking structure.

Claims (10)

1. a damage of rock test acoustic emission test sensor monoblock type locating device, the installing mechanism comprising locating device framework (1), install the mount pad (6) of acoustic emission test sensor (11), acoustic emission test sensor be fixed on the fixation kit in mount pad and be installed on by mount pad on locating device framework, is characterized in that: described locating device framework is integral ring-shaped structural framing; Described mount pad is the tube structure that inner chamber and acoustic emission test sensor outer rim match, and barrel wall is designed with sensor wiring and draws breach; Described installing mechanism be can automatic axial adjustment mount pad position installing mechanism, total fourth officer, be positioned at the same cutting plane of locating device framework, arrange in opposite directions between two, article two, installation site line is mutually vertical, makes the line at two the emission sensor transverse plane centers be oppositely arranged be installed on locating device framework by mount pad, erecting frame by test specimen diameter or test specimen kernel of section.

2. damage of rock test acoustic emission test sensor monoblock type locating device according to claim 1, is characterized in that: described locating device framework is unitary circular ring-shaped frame or rectangular ring framework.

3. damage of rock test acoustic emission test sensor monoblock type locating device according to claim 1, it is characterized in that: as the described cylindrical shell of mount pad, the Notch angle of cylindrical shell is not more than 120 degree.

4. damage of rock test acoustic emission test sensor monoblock type locating device according to claim 1, is characterized in that: described fixation kit is formed by the open annular spring leaf (7) put by acoustic emission test sensor hoop on mount pad with by the locking mechanism (8) that open annular spring leaf opening is locked.

5. damage of rock test acoustic emission test sensor monoblock type locating device according to claim 4, is characterized in that: described locking mechanism is snap lock structure.

6. damage of rock test acoustic emission test sensor monoblock type locating device according to claim 4, is characterized in that: described locking mechanism is bolt and nut locking mechanism.

7. according to the acoustic emission test sensor monoblock type locating device of the damage of rock test one of claim 1 to 6 Suo Shu, it is characterized in that: described installing mechanism comprises the sliding bar (3) be fixedly connected with mount pad (6), be nested with outside sliding bar, one end acts on mount pad, the spring (5) that the other end acts on locating device frame inner wall and the bearing (2) be fixedly installed in locating device framework outside wall surface, described bearing is guide cylinder structural bearings, be fixedly installed perpendicular to locating device framework outside wall surface, the major diameter fit of internal diameter and sliding bar forms sliding pair, sliding bar can be arranged in the guide cylinder as bearing through the mounting hole on locating device framework axially slidably, stretch in outside sliding bar and the body of rod outside guide cylinder is designed with limit slippage bar and slides axially position limiting structure.

8. damage of rock test acoustic emission test sensor monoblock type locating device according to claim 7, is characterized in that: limit slippage bar in axial sliding position limiting structure is the bolt and nut position limiting structure be made up of the screw thread on sliding bar and the nut that matches with it.

9. damage of rock test acoustic emission test sensor monoblock type locating device according to claim 7, is characterized in that: limit slippage bar in axial sliding position limiting structure is the pin-and-hole pin position limiting structure be made up of the pin-and-hole on sliding bar and the pin that matches with it.

10. according to the acoustic emission test sensor monoblock type locating device of the damage of rock test one of claim 1 to 6 Suo Shu, it is characterized in that: locating device framework is designed with the outer approaching channel hole (10) of acoustic emission test sensor wiring.