CN104849003A - Electromagnetic excitation device and method for detecting anchoring state of mining anchor rod - Google Patents
Electromagnetic excitation device and method for detecting anchoring state of mining anchor rod Download PDFInfo
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- CN104849003A CN104849003A CN201410781271.5A CN201410781271A CN104849003A CN 104849003 A CN104849003 A CN 104849003A CN 201410781271 A CN201410781271 A CN 201410781271A CN 104849003 A CN104849003 A CN 104849003A
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Abstract
The invention provides an electromagnetic excitation device and method for detecting an anchoring state of a mining anchor rod. The electromagnetic excitation device includes a sensor, a magnetic base, an electromagnetic exciter and a detector. One end face of the magnetic base is connected with the sensor while the other end face is in suction connection with an end tip of the to-be-detected anchor rod. The electromagnetic exciter is an iron winding shaft connected to the detector via an electric wire. The diameter of a central through hole of the electromagnetic exciter is greater than that of the to-be-detected anchor rod and can move on the end tip of the anchor rod freely in a sleeving manner. The detector is connected with the sensor through a coaxial cable. The detector is a multifunctional device and is equipped with anchor rod detection software, and can control pulses of the electromagnetic exciter as well as collect and process waveform signals sent from the sensor at the same time. The electromagnetic excitation device is simple in structure, convenient to operate and good in excitation and detection effect. The detection method is adjustable and controllable and can guarantee the consistence of waveform energy and frequency in each excitation process.
Description
Technical field
The present invention relates to a kind of exciting device and the lossless detection method that run anchor rod anchored state-detection, be especially applicable to the electromagnetic exciting apparatus and method that underground coal mine runs anchor rod anchored state Non-Destructive Testing.
Background technology
Anchor rod anchored technology at home and abroad develops rapidly in Geotechnical Engineering, and is widely used, and has particularly become the main support form of coal mine roadway.Therefore for ensureing quality anchor rod anchored in engineering construction, the research about Detection of Bolt Bonding Integrity lossless detection method more and more comes into one's own.Due to coal mine roadway engineering feature, complicated geology, the factor impact such as to adopt, Engineering Quality Control is more difficult, and qualitative problems of construction often occurs.Facts have proved, bolt supporting quality be ensured, to anchoring status, as rock-bolt length, freedom length, anchoring depth and constructional deficiency etc. detection, evaluate be indispensable.Current coal mine roadway bolt supporting quality testing mainly contains two classes: drawing experiment and sonic method.It is a kind of destructive detection method that the drawings such as anchor ergometer, drawing meter detect, and produces stronger disturbance, reduce the reinforcement effect of anchor pole to country rock, be only limitted to indivedual selective examination, and can not measure rock-bolt length and reflect anchoring quality comprehensively tunnel.Therefore, in order to improve run anchor pole and detect accuracy, security and ageing, sonic method Dynamic Non-Destruction Measurement will be the Main Means that detects of mine bolt supporting quality and developing direction.
Sonic method is the Detection of Bolt Bonding Integrity lossless detection method that engineering circles generally adopts at present.Anchor pole is regarded as one dimension elastic rod founding mathematical models, consider that the compressional wave wavelength ratio anchor pole radius that exciting force produces is much bigger, thus ignore the transversal displacement of system.Its specific practice lays an acceleration transducer at anchor pole exposed end portion, then in top excite sound waves, sound wave is propagated to surrounding through anchor pole, reflection and transmission is there is at each wave impedance differential boundary of anchoring body, the excitation wave received by analyte sensors and reflection wave signal determine the anchoring status of anchor pole, wherein rock-bolt length gets according to calculating the time of arrival of anchor pole bottom reflection signal, sandstone-slurry saturation is then utilize reflected signal to determine with the energy Ratios transmitted, and evaluates the anchoring quality of anchor pole.Research shows, when low frequency, 40KHz frequency should be adopted to detect; When high-frequency, 2MHz is a more satisfactory excited frequency, and frequency is higher, and the accuracy rate of detection is higher.Low-frequency vibration mainly adopts at present and manually knocks, and cannot produce the effective vibration signal propagated along anchor rod body when the out-of-flatness of anchor pole end face, and manually knocks and cannot control energy and excited frequency.Special and the condition of complexity for colliery, we have researched and developed the generation equipment of high-frequency vibration, and adopt high speed ARM chip accurately to capture echoed signal clearly.
Summary of the invention
Run the exciting uncontrollability of anchor pole detection without damage to solve underground coal mine, the invention provides the apparatus and method that a kind of electromagnetic method exciting detects mine anchor rod anchoring status, this apparatus structure is simple, and easy to operate, Detection results is good.Described method is adjustable, controlled, can ensure each excitation energy and firing time consistance.
The present invention's adopted technical scheme of dealing with problems is: a kind of electromagnetic method exciting detects the device of mine anchor rod anchoring status, and this device comprises sensor, magnetic base, electromagnetic exciter, detector; Described sensor is acceleration transducer; Described magnetic base is ferromagnetism right cylinder, and an end face is connected with sensor by tommy, and surface of contact connects with powerful AB is gluing, and other end and tested anchor pole expose end face magnetic absorption and connect; Described electromagnetic exciter is that irony roll inside is wound with multiturn copper coil, and draw two taps of copper coil, in outside, iron sheet seals, and then pour into fluid sealant with waterproof, profile is circle ring column; Electromagnetic exciter intermediate throughholes diameter is greater than tested bolt diameter, freely can be enclosed within anchor pole and expose activity on termination; Described detector is connected by concentric cable with sensor; Described detector connects with electromagnetic exciter electric wire; Detector is multifunctional equipment, the analysis acquisition software that anchor pole detects is installed, software has " signals collecting " button, clicks " signals collecting " button, detector applies a pulse to electromagnetic exciter, produces the elastic wave of longitudinal propagation in tested anchor rod body; Detector starts elastic wave collection, analysis and processing program simultaneously, namely completes an exciting and signal acquisition process.
A kind of electromagnetic method exciting detects the method for mine anchor rod anchoring status:
(1) hammer vibration energy, frequency required for detection, suitable electromagnetic exciter is selected to be enclosed within the exposed junction of tested anchor pole, the edge, outer face of electromagnetic exciter exposes end face 2-3cm apart from tested anchor pole, connects electromagnetic exciter cable " transmitting " seat to detector, as shown in Figure 1;
(2) what sensor and magnetic base are adsorbed on tested anchor pole exposes end face, and as far as possible point-blank, connecting sensor cable is to " passage 1 " seat of detector in the axle center of sensor, magnetic base, tested anchor pole;
(3) detector start, start anchor pole inspection software, test item correlation parameter is set, as detection site, date, sample frequency etc., arranging sample frequency is in this example 1.25MHz, click " signals collecting " button on anchor pole inspection software, detector applies a pulse to electromagnetic exciter, and electromagnetic exciter produces the elastic wave of longitudinal propagation in tested anchor rod body; In detector, anchor pole inspection software starts elastic wave collection, analysis and processing program simultaneously, by the elastic wave analysis of information collection process that sensor detects, namely completes an exciting and signal acquisition process; ,
(4) repeat step (3) and carry out multiple signal collection.
Beneficial effect of the present invention: this electromagnetic method exciting detects the apparatus and method of mine anchor rod anchoring status, electromagnetic method exciting is adopted to produce compressional wave in tested anchor pole, and according to the different requirements detected, select copper coil circle line and quality in electromagnetic exciter, make the elastic wave inspiring different frequency in anchor rod body; Can be different according to tested anchor pole, regulate detector to electromagnetic exciter discharge and recharge pulse energy size and exciting time, to produce the elastic wave of different-energy and different frequency.Namely excited elastic wave energy is controllable, ensures the elastic wave consistance at every turn excited, decreases stochastic error.Eliminate employing when manually knocking, because the out-of-flatness of anchor pole end face cannot produce the effective vibration signal propagated along anchor rod body, and manually knock and cannot control energy and excited frequency; After avoiding excitation head in the past to impact anchor pole end face, secondary vibration shows picture simultaneously.The device of this electromagnetic method exciting detection mine anchor rod anchoring status can meet the requirement of underground coal mine anchor pole detection completely; And this method is adjustable, controlled, ensure each excitation energy and firing time consistance, the present invention is that the anchor rod anchored state-detection under the special environment condition of colliery provides a kind of simple, effective method.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Accompanying drawing 1 is the structural representation that this electromagnetic method exciting detects the device of mine anchor rod anchoring status.
In figure, 1. sensor, 2. magnetic base, 3. electromagnetic exciter, 4. anchor pole, 5. cement cartridge bag, 6. rock, 7. detector.
Embodiment
As shown in Figure 1, a kind of electromagnetic method exciting detects the device of mine anchor rod anchoring status, and this device comprises 1. sensors, 2. magnetic base, 3. electromagnetic exciter, 7. detector; This device has a columniform magnetic base 2; This magnetic base 2 one end face is connected by tommy with sensor 1, connects with powerful AB is gluing at contact end face; One end of this magnetic base 2 is connected with tested anchor pole end 4 magnetic absorption; Described sensor 1 is connected by concentric cable with detector 7; Described electromagnetic exciter 3 is wound with multiturn copper coil for irony roll inside, and behind coil two tap pull-out roll edges, in outside, iron sheet seals, and sealing place perfusion silica gel is with waterproof; Described electromagnetic exciter 3 profile is hollow circular cylinder; The diameter of intermediate throughholes is greater than the diameter of tested anchor pole 4, can be freely movable on anchor pole; Described electromagnetic exciter 3 cable connects with detector 7.
A kind of electromagnetic method exciting detects the method for mine anchor rod anchoring status: electromagnetic exciter 3 is enclosed within tested anchor pole 4 exposed junction, apart from termination 2-3cm, sensor 1 and magnetic base 2 are adsorbed on tested anchor pole 4 to be exposed on end face, and sensor 1, magnetic base 2, tested anchor pole 4 axle center are point-blank; The concentric cable of sensor 1 is connected with detection " passage 1 " seat of detector 7, the cable of electromagnetic exciter 3 is connected with pulse " transmitting " seat of detector 7.Detector 7 is started shooting, start anchor pole inspection software, the correlation parameter of tested anchor pole is set, as detected date, place, sample frequency etc., it is 1.25MHz that the present embodiment arranges sample frequency, click " information acquisition " button on software interface, apply a pulse in detector 7 pairs of electromagnetic exciters 3, in the body of rod of tested anchor pole 4, produce the elastic wave of longitudinal propagation; Inspection software starts elastic wave collection simultaneously, analysis and processing program, is collected by the pulsating wave that sensor 1 detects in detector 7, namely completes an exciting and gatherer process.
This example example is only and general using method of the present invention is described, will select different electromagnetic exciters 3 as required and arrange electromagnetic exciting energy and time, obtain the vibration wave of different frequency, energy during concrete use.
Claims (6)
1. electromagnetic method exciting detects a device for mine anchor rod anchoring status, comprises sensor (1), magnetic base (2), electromagnetic exciter (3), detector (7); This electromagnetic exciter (3) is irony roll, and inside is wound with multiturn copper coil, and in outside, iron sheet seals; What this electromagnetic exciter (3) was enclosed within tested anchor pole (4) exposes termination, apart from tested anchor pole (4) outer face 2-3cm; Described electromagnetic exciter (3) and detector (7) cable connection; Sensor (1) and magnetic base (2) adopt tommy to connect, then connect with powerful AB is gluing, be adsorbed on the outer face of tested anchor pole (4), sensor (1), magnetic base (2) and anchor pole (4) axle center are point-blank; Described sensor (1) is connected with detector (7) cable; It is characterized in that: the shape of described electromagnetic exciter (3) is a circle ring column, and its middle through-hole diameter is greater than the diameter of tested anchor pole (4).
2. a kind of electromagnetic method exciting according to claim 1 detects the device of mine anchor rod anchoring status, it is characterized in that: described electromagnetic exciter (3), according to testing requirement, selects the number of turn of inner institute coiling.
3. a kind of electromagnetic method exciting according to claim 1 detects the device of mine anchor rod anchoring status, it is characterized in that: described sensor (1) is acceleration transducer.
4. a kind of electromagnetic method exciting according to claim 1 detects the device of mine anchor rod anchoring status, it is characterized in that: electromagnetic exciter (3) exciting elastic wave and sensor (1) signals collecting, by detector integrative control, ensure that the consistent of each exciting and signals collecting.
5. a kind of electromagnetic method exciting according to claim 1 detects the device of mine anchor rod anchoring status, it is characterized in that: electromagnetic exciter (3) and detector (7) cable connection, by controlling detector (7) to the pulse energy of electromagnetic exciter (3) and burst length, the elastic wave energy that control excites and frequency, ensure the consistance of the signal at every turn excited, reduce stochastic error, after effectively avoiding mechanical type to hit shaking, secondary pulse produces interference elastic wave in tested anchor pole (4) body of rod, ensure that the consistance of detector (7) signal sampling.
6. electromagnetic method exciting detects a method for mine anchor rod anchoring status, it is characterized in that, comprises the following steps:
6.1 according to detect required for hammer vibration energy, frequency, select suitable electromagnetic exciter (3) to be enclosed within the exposed junction of tested anchor pole (4), the cable of electromagnetic exciter (3) is connected with " transmitting " seat of detector (7);
Sensor (1) and magnetic base (2) are adsorbed on the outer face of tested anchor pole (4) by 6.2, are connected by the cable of sensor (1) with " passage 1 " seat of detector (7);
6.3 detectors (7) are started shooting, start anchor pole inspection software, test item correlation parameter is set, comprise detection site, detect the date, sample frequency, and sample frequency is set to 1.25MHz, click " signals collecting " button of the upper software of detector (7), detector (7) applies a pulse to electromagnetic exciter (3), the elastic wave of longitudinal propagation is produced in tested anchor pole (4) body of rod, detector (7) gathers simultaneously, analyzing and processing elastic wave information, completes an exciting and signal acquisition process;
6.4 repeat step 6.3 carries out multiple signal collection.
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| CN201410781271.5A CN104849003A (en) | 2014-12-18 | 2014-12-18 | Electromagnetic excitation device and method for detecting anchoring state of mining anchor rod |
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| CN201410781271.5A CN104849003A (en) | 2014-12-18 | 2014-12-18 | Electromagnetic excitation device and method for detecting anchoring state of mining anchor rod |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911146A (en) * | 2016-04-27 | 2016-08-31 | 湖南科技大学 | Apparatus and method for monitoring surrounding rock state of anchorage zone |
| CN106442110A (en) * | 2016-10-14 | 2017-02-22 | 安徽理工大学 | Secondary impact bullet for Hopkinson bar |
| CN105911146B (en) * | 2016-04-27 | 2019-07-16 | 湖南科技大学 | A kind of monitoring device and method of anchorage zone state of surrounding rock |
| CN111766298A (en) * | 2020-06-30 | 2020-10-13 | 武汉市工程科学技术研究院 | Novel anchor rod nondestructive testing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911146A (en) * | 2016-04-27 | 2016-08-31 | 湖南科技大学 | Apparatus and method for monitoring surrounding rock state of anchorage zone |
| CN105911146B (en) * | 2016-04-27 | 2019-07-16 | 湖南科技大学 | A kind of monitoring device and method of anchorage zone state of surrounding rock |
| CN106442110A (en) * | 2016-10-14 | 2017-02-22 | 安徽理工大学 | Secondary impact bullet for Hopkinson bar |
| CN111766298A (en) * | 2020-06-30 | 2020-10-13 | 武汉市工程科学技术研究院 | Novel anchor rod nondestructive testing method |
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