CN210426413U - Multipoint displacement measuring system based on magnetic displacement sensor - Google Patents
Multipoint displacement measuring system based on magnetic displacement sensor Download PDFInfo
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- CN210426413U CN210426413U CN201921295308.8U CN201921295308U CN210426413U CN 210426413 U CN210426413 U CN 210426413U CN 201921295308 U CN201921295308 U CN 201921295308U CN 210426413 U CN210426413 U CN 210426413U
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Abstract
The utility model relates to a multiple spot displacement measurement system based on magnetic displacement sensor uses the displacement sensor based on the magnetic displacement principle, can realize the displacement change measurement of a plurality of measurement stations in drilling through the mode of an arbitrary required quantity magnet of probe rod collocation, has solved the problem that prior art single sensor can only measure single measurement station displacement, has advantages such as the range is big, measurement accuracy is high, simple structure, easy installation, exempt from the debugging.
Description
Technical Field
The utility model relates to a ground safety monitoring technical field especially relates to a multiple spot displacement measurement system based on magnetic displacement sensor.
Background
The traditional multipoint displacement measuring device (namely a multipoint displacement meter) for soil body layered displacement (or layered settlement) generally adopts a displacement sensor (such as a vibrating wire type, an inductance type, a potentiometer type, a differential resistance type and a differential transformer type), in order to measure the displacement of a plurality of measuring points in a drill hole, a combination of a plurality of groups of displacement sensors, transmission rods and anchoring heads is needed, and the displacement measurement of the measuring points at different depths is realized by installing the anchoring heads at different depths in the drill hole and fixing the anchoring heads in the drill hole. The structure of the conventional multipoint displacement meter is shown in figure 1 and comprises 3-6 displacement sensors, a sensor mounting base and a protector, a displacement transmission rod and a protection pipe thereof, an anchoring head and the like. The method is generally buried in structures such as earth and rockfill dams, side slopes and tunnels, and deformation such as relative displacement, layered settlement and slippage of multiple deep-layer positions of the structures is measured. A plurality of anchoring heads (an anchoring head 1, an anchoring head 2 and an anchoring head 3) are arranged at different depths in the borehole, and the anchoring heads comprise grouting type, hydraulic type, elastic relaxation type and the like and are anchored in the borehole by different methods. Each anchoring head is respectively connected with a transfer rod (a displacement transfer rod 1, a displacement transfer rod 2 and a displacement transfer rod 3) and a protection tube thereof and is connected with a displacement sensor positioned at the hole opening, the displacement sensor is fixed on a sensor mounting base, and the sensor mounting base is fixed at the hole opening. When displacement change is generated between rock soil at any anchoring point and the orifice, the displacement change at the anchoring point is transmitted to the orifice through the transmission rod and is sensed by the displacement sensor, and finally the displacement change is converted into an electric signal to be output. When the displacement sensor is used for soil body layered displacement (or layered settlement), one or more displacement sensors are generally adopted, and the displacement sensor is connected in a drill hole by installing an anchor head in the drill hole, so that the displacement sensor is suitable for a water pipe type settlement gauge embedded and installed and a static level gauge suitable for surface installation, but the devices can not work in an underwater environment or are not suitable for installation in a narrow space due to large size.
The existing multipoint displacement meter is limited by the working principle and has the following defects: 1) the number of the measuring points is limited, at most 6 measuring points can be arranged in one drilling hole, and the drilling hole diameter is required to be larger when the number of the measuring points is larger; 2) when a plurality of measuring points exist, a plurality of displacement sensors are needed, and the number of the displacement sensors is needed for the number of the measuring points arranged in the drill hole; 3) the installation is complicated. Arranging anchoring heads, transfer rods and protection pipes corresponding to the number of the measuring points in one drilling hole; 4) limited by using conditions and working principles, the displacement sensor used for the conventional multipoint displacement meter has a limited measuring range which is only 50-300 mm, and the larger the measuring range of the sensor is, the lower the relative precision is, and the small change cannot be sensitively sensed; 5) the displacement sensor has poor capacity of adapting to the over-range, and when the displacement changes beyond the range of the displacement sensor, the displacement sensor needs to be readjusted or replaced, but most of practical engineering projects show that the adjustment or the replacement is difficult to implement or is impossible.
SUMMERY OF THE UTILITY MODEL
For solving prior art's not enough, the utility model provides a multiple spot displacement measurement system based on magnetic displacement sensor uses the displacement sensor based on the magnetic displacement principle, realizes arranging a plurality of measurement stations under the prerequisite that single feeler lever and do not increase the drilling aperture, and displacement sensor measurement accuracy is high, convenient adjustment and change.
In order to achieve the above object, the utility model discloses the technical scheme who adopts includes:
a multipoint displacement measuring system based on a magnetic displacement sensor is characterized by comprising the magnetic displacement sensor, a plurality of magnets, a protection tube, an orifice base, a protection cover and data acquisition equipment;
the magneto-displacement sensor comprises a measuring circuit, a detecting rod with a built-in waveguide wire and a detecting rod fixing disc; the measuring circuit is connected with the waveguide wire and can send excitation pulse signals to the waveguide wire; the excitation pulse signal propagating along the waveguide wire forms a torsional wave under the action of magnetic force, and the torsional wave is transmitted back to the measuring circuit along the waveguide wire; the length of the probe rod is matched with the drilling depth of the measuring position or matched with the requirement of the measuring depth; one surface of the detection rod fixing disc is fixedly connected with the detection rod, the other surface of the detection rod fixing disc is fixedly connected with the measurement circuit, and the diameter of the detection rod fixing disc is larger than the outer diameter of the detection rod;
the magnet is a magnetic ring structural component made of a magnetic material; the magnets are respectively arranged at the positions of points to be measured in the drill hole, the outer diameter of the magnetic ring structure is smaller than the inner diameter of the drill hole at the measuring position, and the inner diameter of the magnetic ring structure is matched with the outer diameter of the protection tube so that the magnets are sleeved on the protection tube and simultaneously generate displacement along the axial direction of the protection tube;
the protective tube is a nonmagnetic hollow tube with an opening at the top and an opening at the bottom; the outer diameter of the protection tube is matched with the inner diameter of a magnet ring structure of the magnet, so that the magnet is sleeved on the protection tube, the inner diameter of the protection tube is larger than the outer diameter of the detection rod, and the length of the hollow part in the protection tube is larger than or equal to the length of the detection rod, so that the detection rod is inserted into the hollow part of the protection tube;
the orifice base is a thin sheet part with the outer diameter larger than the diameter of the drilled hole at the measuring position, and is provided with a plurality of orifice fixing bolt holes, a plurality of detecting rod fixing plate fixing bolt holes, a magnetic displacement sensor fixing hole and a protective cover mounting position; the orifice fixing bolt hole is positioned on the orifice base, is close to the extension and is larger than the diameter of a drilled hole at the measuring position; the fixed hole of the magneto displacement sensor is positioned in the center of the orifice base, and the size of the hole is matched with the outer diameter of the detection rod and is smaller than the diameter of the fixed disc of the detection rod, so that the detection rod is inserted into the fixed disc of the detection rod and stably bears the fixed disc of the detection rod;
the protective cover is detachably arranged on the protective cover mounting position of the orifice base and covers the detection rod fixing disc and the measuring circuit; the top of the protective cover is also provided with an opening through which a power line and a signal transmission cable pass;
the data acquisition equipment is connected with the measuring circuit through a signal transmission cable, and the position change of the magnet relative to the detecting rod is measured and calculated by the measuring circuit to obtain magnet displacement measurement data, and then the magnet displacement measurement data is output to the data acquisition equipment through the signal transmission cable.
Further, the magnet is in a circular magnetic ring structure or a polygonal magnetic ring structure or an irregular special-shaped magnetic ring structure customized according to measurement requirements.
Furthermore, the protection tube also comprises a magnet positioning point arranged on the outer wall of the tube and used for positioning the position of the magnet sleeved on the protection tube; the magnet positioning points are corresponding points of measuring positions in the drill hole on the protective pipe, wherein the corresponding points are made according to measuring requirements and/or measuring experience.
Furthermore, the detection rod fixing disc is fixedly connected with the orifice base through bolts.
Furthermore, the data acquisition equipment comprises a data recording and storing circuit and a data display and output circuit which are connected with each other, wherein the data recording and storing circuit is used for storing and recording displacement measurement data of the magnets, and the data display and output circuit outputs and displays displacement directions and displacement distances of the magnets.
The utility model has the advantages that:
the multi-point displacement measuring system based on the magneto-induced displacement sensors implements displacement change measurement on a target position, can realize displacement change measurement of a plurality of measuring points in a drill hole in a mode of matching one detecting rod with any required number of magnets, and solves the problem that a single sensor in the prior art can only measure single position displacement, so that a conventional multi-point displacement meter needs a plurality of displacement sensors, anchoring parts with the same number and transmission rods with the same number; meanwhile, the limitation that only 6 measuring points can be measured simultaneously in the same drilling hole in the prior art is broken through, the number of magnets is increased according to actual measurement needs, and measurement support for more than 10 measuring points in a single drilling hole can be easily realized. All components in the system of the utility model are hardware devices, all the hardware devices work cooperatively, and the torsional wave generated by the magnet displacement is adopted to measure the displacement, so that the system has the advantages of large measuring range and high measuring precision compared with the prior art; because the magnet is not directly contacted or connected with the detection rod, the magnet can freely move according to the displacement of the soil body, and the measuring range is not limited by the structure of the detection rod; the torsional wave return time is used for calculating the displacement, the measurement resolution is close to infinity, and the displacement measurement requirements of various precisions can be met. Compared with the prior art, the system need not to use complicated probing meter structure of reaching, simple structure has, easy installation, exempt from the characteristics of debugging, installation magnet after the drilling is accomplished, the protection tube, drill way base and backfill grout, push magnetic displacement sensor at last fixed can, effectively shorten installation time and reduce the installation degree of difficulty, the simplification of structure makes the more conventional multiple spot displacement meter of volume reduce greatly simultaneously, also easily later stage use maintenance and maintenance, even magnetic displacement sensor breaks down, only need with magnetic displacement sensor wholly take out the change can, use cost is reduced, applicable scene is more extensive. The device is not only suitable for drilling installation in various directions, but also can be used for filling installation to measure the settlement of soil.
Drawings
FIG. 1 is a prior art schematic diagram of multi-point displacement measurement.
Fig. 2 is the utility model discloses a multiple spot displacement measurement system schematic diagram based on magnetic displacement sensor.
Fig. 3 is a schematic view of an embodiment of the orifice base of the present invention.
Description of the figure numbering: the device comprises a 1-magnetic displacement sensor, a 11-measuring circuit, a 12-waveguide wire, a 13-detection rod, a 14-detection rod fixing disc, a 2-magnet, a 3-protection tube, a 4-orifice base, a 41-orifice fixing bolt hole, a 42-detection rod fixing disc fixing bolt hole, a 43-magnetic displacement sensor fixing hole, a 44-protective cover installation position, a 5-protective cover, a 6-data acquisition device, a 61-signal transmission cable and a 7-fixing material.
Detailed Description
For a clearer understanding of the present invention, reference will be made to the following detailed description of the embodiments with reference to the accompanying drawings.
Fig. 2 shows the utility model discloses a multiple spot displacement measurement system schematic diagram based on magnetic displacement sensor, including magnetic displacement sensor 1, a plurality of magnet 2, protection tube 3, drill way base 4, safety cover 5 and data acquisition equipment 6, wherein magnetic displacement sensor 1 (also can be called the magnetic induced shrinkage or elongation displacement sensor) has the characteristics that the range is big, measurement accuracy is high and infinite resolution, including measuring circuit 11, the probe rod 13 (the probe rod also can be called the waveguide pipe) and the probe rod fixed disk 14 of built-in waveguide wire 12. The measuring circuit 11 is connected with the waveguide wire 12 and can send out an excitation pulse signal to the waveguide wire 12, the excitation pulse signal transmitted along the waveguide wire 12 forms a torsional wave under the action of magnetic force, the torsional wave is transmitted back to the measuring circuit 11 along the waveguide wire 12, and the position of the magnet is determined by measuring the return time from the excitation pulse to the torsional wave; the length of the detection rod 13 is matched with the drilling depth of the measurement position or matched with the requirement of the measurement depth; one surface of the detection rod fixing disc 14 is fixedly connected with the detection rod 13, the other surface of the detection rod fixing disc 14 is fixedly connected with the measuring circuit 11, and the diameter of the detection rod fixing disc 14 is larger than the outer diameter of the detection rod 13. The magnet 2 is a magnetic ring structural component made of a magnetic material, and specifically can be a circular magnetic ring structure (such as a ring magnet) or a polygonal magnetic ring structure (such as a square magnet with holes) or an irregular special-shaped magnetic ring structure (such as a special-shaped magnet without holes) customized according to measurement needs; the magnets 2 are respectively arranged at the positions of the points to be measured in the drill hole (the number of the magnets in the drill hole or the magnets embedded in the soil body is not limited), the outer diameter of the magnetic ring structure is smaller than the inner diameter of the drill hole at the measuring position, and the inner diameter of the magnetic ring structure is matched with the outer diameter of the protection tube 3, so that the magnets 2 can be sleeved on the protection tube 3 and can simultaneously generate displacement along the axial direction of the protection tube. By using the principle that the detection rod 13 of one magnetodisplacement sensor 1 allows a plurality of magnets 2 to be arranged at regular intervals to form a plurality of position detection points, two or more magnets 2 are arranged on one fixed-length detection rod 13, thereby forming a multipoint displacement detection device. The protection tube 3 is a non-magnetic hollow tube with an opening at the top and an opening at the bottom, the outer diameter of the protection tube 3 is matched with the structural inner diameter of the magnetic ring of the magnet 2 to enable the magnet 2 to be sleeved on the protection tube 3, the inner diameter of the protection tube 3 is larger than the outer diameter of the detection rod 13, and the length of the hollow part inside the protection tube 3 is not smaller than the length of the detection rod 13, so that the detection rod 13 can be inserted into. Because the inner diameter of the protection tube 3 is larger than the outer diameter of the detection rod 13, the magnetic displacement sensor 1 can be conveniently pushed into the protection tube 3 after the cement slurry is completely cured until all the cement slurry is pushed in, and finally, the tail end of the magnetic displacement sensor 1 is fixed on the orifice base 4 through a bolt. Or the magnet 2 is fixed on the upper side of the protection pipe 3 by using a sedimentation disc and is filled and installed along with the earth and stone body, the magnet is nested and sleeved on the protection pipe 3 according to a preset interval, and the magnet is fixed in the soil body through backfilling the sand and stone material according to the preset interval. The protective tube 3 is a metal or non-metal tube of non-magnetic material for isolating the probe rod 13 so that the probe rod 13 is free in the protective tube 3, i.e. the probe rod 13 is not elongated or compressed by the position change of the magnets at each station. Further preferably, the protection tube 5 may further include a magnet positioning point arranged on the outer wall of the tube for positioning the position where the magnet 2 is sleeved on the protection tube 3; the magnet positioning points are corresponding points on the protective tube 3 at the measuring positions in the borehole established according to the measuring requirements or according to the measuring experience.
The orifice base 4 is used for fixing the magnetic displacement sensor 1 in a detachable manner, the orifice base 4 is a thin plate member having an outer diameter larger than the diameter of the drilled hole at the measurement position, and is provided with a plurality of orifice fixing bolt holes 41, a plurality of probe rod fixing plate fixing bolt holes 42, a magnetic displacement sensor fixing hole 43, and a protective cover mounting position 44 as shown in fig. 3 (sectional view and front view); the orifice fixing bolt hole 41 is located near the outer extension of the orifice base 4 and is larger than the diameter of the hole drilled at the measuring position, and the magnetic displacement sensor fixing hole 43 is located at the central position of the orifice base 4 and has an opening size matched with the outer diameter of the detection rod 13 and smaller than the diameter of the detection rod fixing disk 14, so that the detection rod 13 can be inserted without obstruction and can stably bear the detection rod fixing disk 14. The protective cover 5 is detachably arranged on the protective cover mounting position 44 of the orifice base 4 and can completely cover the detection rod fixing disc 14 and the measuring circuit 11; the top of the protective cover 5 is also provided with an opening for passing through a power line and a signal transmission cable. The data acquisition equipment 6 is connected with the measuring circuit 11 through the signal transmission cable 61, when any magnet 2 in the hole, namely a measuring point, generates axial displacement relative to the direction of the hole opening, the position of the magnet 2 relative to the detecting rod 13 changes, the position transformation quantity of the magnet 2 is measured and calculated by the measuring circuit 11 arranged in the magneto-displacement sensor 1 to obtain magnet displacement measurement data, and the magnet displacement measurement data is output to the data acquisition equipment 6 through the signal transmission cable 61 to complete data recording and display.
Further, the data acquisition equipment preferably comprises a data recording and storing circuit and a data display and output circuit which are connected with each other, wherein the data recording and storing circuit is used for storing and recording the displacement measurement data of the magnets, and the data display and output circuit outputs and displays the displacement direction and the displacement distance of each magnet.
In the process of installing the system, firstly, according to the installation position of a magnet 2 which is determined in advance, each magnet 2 is respectively arranged at the position of each point to be measured in a drill hole, the required magnet 2 is sleeved on a protection pipe 3 according to the installation position, the protection pipe 3 provided with the magnet 3 is installed in the drill hole, or the magnet is fixed in the drill hole by using a hydraulic expansion ring/expansion clamp, or the magnet 2 is fixed on the protection pipe 3 in advance according to the installation position by using a non-magnetic settling plate, and the protection pipe 3 provided with the magnet 2 is installed in the drill hole; backfilling and fixing the gap between the protection tube 3 and the drilled hole by using a fixing material 7, wherein the used fixing material can be cement mortar, sand and stone materials, sand and soil and the like; fixedly mounting the orifice base 4 shown in fig. 3 to the drilling orifice through the orifice fixing bolt hole 41 using a bolt and ensuring that the magnetic displacement sensor fixing hole 43 on the orifice base 4 is aligned with the protection tube top opening; inserting the detection rod 13 into the protection tube 3 from the magnetic displacement sensor fixing hole 43 until the detection rod fixing disk 14 contacts with the orifice base 4, and fixing the detection rod fixing disk 14 to the detection rod fixing disk fixing bolt hole 42 on the orifice base 4 by using bolts; the power line is connected with a power supply, the data acquisition equipment 6 is connected with the measuring circuit 11 through a signal transmission cable 61, and the protective cover 5 is correspondingly arranged on the orifice base protective cover installation position 44.
The utility model discloses multiple spot displacement measurement system based on magnetic induced shrinkage or elongation principle's magnetic induced shrinkage or elongation displacement sensor 1 combines a plurality of magnets 2 to measure the displacement change of the inside a plurality of positions of earth and stone body, can regard as ground, the layered displacement of earth and stone body or subside change measuring device, subside the measurement that changes with the layering like the deep displacement change that is used for side slope, tunnel, underground chamber, earth and stone dam body etc.. On the premise of not increasing the requirements of the hole diameter of a drill hole and the like, more than 7 measuring points can be arranged in the system, and the maximum number of the measuring points can reach 20 or more. And the multipoint displacement measuring system has the advantages of simple structure, higher relative precision, convenience in replacement and the like.
Use the utility model discloses a system carries out the concrete method of multiple spot displacement measurement and preferably includes following step:
A. installing a multi-point displacement measuring system based on a magnetic displacement sensor in a drill hole to be measured; this step may be particularly preferably the following steps A1-A6:
a1, determining the number n of magnets to be used according to the measurement requirement, namely determining the number n of measurement points in the drill hole, and simultaneously determining the positions of the n measurement points to determine the installation positions of the magnets;
a2, arranging and fixing n magnets and protective tubes in the drill hole to be measured according to the predetermined number n of the magnets and the installation positions of the magnets; the step further concretely comprises sleeving n magnets on the protection tube in advance according to installation positions and installing the protection tube provided with the magnets into the drill hole, or fixing the magnets in the drill hole by using a hydraulic expansion ring/expansion clamp, or fixing the n magnets on the protection tube in advance according to the installation positions by using a non-magnetic settling plate and installing the protection tube provided with the magnets into the drill hole; the hydraulic expansion ring/expansion clamp is a fixing part directly installed in a hard rock drill hole, the hydraulic expansion ring/expansion clamp is formed by combining a magnet with a hydraulic expansion part ring/expansion clamp, the hydraulic expansion ring/expansion clamp is connected with a hydraulic pipe to be pressurized during installation so that the expansion ring expands to generate permanent deformation or the expansion clamp is released by using a special tool, and the magnet can be fixed in the drill hole.
A3, backfilling and fixing a gap between the protection tube and the drill hole by using a fixing material; the adopted fixing materials can be cement mortar, sand and stone materials, sand and soil and the like;
a4, fixedly mounting the orifice base on the drilling orifice by using a bolt and ensuring that the magnetic displacement sensor fixing hole on the orifice base is aligned with the top opening of the protection tube;
a5, inserting a detection rod into the protective tube from the magnetic displacement sensor fixing hole until the detection rod fixing disk is contacted with the orifice base, and fixing the detection rod fixing disk on the orifice base by using bolts;
and A6, connecting the power line with a power supply, and correspondingly installing the protective cover on the installation position of the protective cover of the orifice base.
B. Respectively setting the reference torsional wave return time of each magnet and the corresponding magnet reference position; this step may be particularly preferably the following steps B1-B4:
b1, after the system is set in place, the measuring circuit sends an excitation pulse signal to the waveguide wire;
b2, the excitation pulse signal is influenced by the magnet to generate torsional wave in the process of propagating in the waveguide wire at a fixed speed, and the torsional wave is transmitted back to the measuring circuit at the fixed speed; the distance between the n magnets in the system and the measuring circuit is different, so that the time required by the torsional wave generated by each magnet to be transmitted back to the measuring circuit is different;
b3, the measuring circuit records the time required by the torsional wave generated by each magnet to be transmitted back to the measuring circuit and corresponds the required time to the installation position of each magnet, namely the back transmission time of the torsional wave of the position of each measuring point in the drill hole is obtained;
b4, repeatedly executing the substeps B1 to B3 for a plurality of times, and taking the average value of effective records as the reference torsional wave return time of each magnet; the valid records are the set of all return times with relative deviation less than plus or minus 5% in each record.
C. The measuring circuit continuously sends excitation pulse signals to the waveguide wire and continuously receives feedback torsional waves corresponding to the magnets.
D. The measuring circuit compares the received relative error between the feedback torsional wave return time of each magnet and the reference torsional wave return time of the magnet, and calculates the displacement direction and the displacement distance of each magnet according to the relative error; the feedback torsional wave return time is longer than the reference torsional wave return time of the magnet, namely the magnet is displaced along the axial direction of the protection tube/the detection rod away from or close to the measuring circuit; the feedback torsional wave return time is less than the reference torsional wave return time of the magnet, namely the magnet is displaced towards the direction close to the measuring circuit along the axial direction of the protection tube/the detection rod; the displacement is proportional to the absolute value of the relative error between the feedback torsional wave return time and the reference torsional wave return time.
E. And the measuring circuit sends the calculated displacement direction and displacement distance of each magnet to the data acquisition equipment, and the data acquisition equipment stores, records and outputs and displays the displacement direction and displacement distance of each magnet.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A multipoint displacement measuring system based on a magnetic displacement sensor is characterized by comprising the magnetic displacement sensor, a plurality of magnets, a protection tube, an orifice base, a protection cover and data acquisition equipment;
the magneto-displacement sensor comprises a measuring circuit, a detecting rod with a built-in waveguide wire and a detecting rod fixing disc; the measuring circuit is connected with the waveguide wire; the length of the probe rod is matched with the drilling depth of the measuring position or matched with the requirement of the measuring depth; one surface of the detection rod fixing disc is fixedly connected with the detection rod, the other surface of the detection rod fixing disc is fixedly connected with the measurement circuit, and the diameter of the detection rod fixing disc is larger than the outer diameter of the detection rod;
the magnet is a magnetic ring structural component made of a magnetic material; the magnets are respectively arranged at the positions of points to be measured in the drill holes, the outer diameter of the magnetic ring structure is smaller than the inner diameter of the drill hole at the measuring position, and the inner diameter of the magnetic ring structure is matched with the outer diameter of the protection pipe;
the protective tube is a nonmagnetic hollow tube with an opening at the top and an opening at the bottom; the outer diameter of the protection tube is matched with the inner diameter of the magnet ring structure, the inner diameter of the protection tube is larger than the outer diameter of the detection rod, and the length of the hollow part in the protection tube is larger than or equal to the length of the detection rod, so that the detection rod is inserted into the hollow part of the protection tube;
the orifice base is a thin sheet part with the outer diameter larger than the diameter of the drilled hole at the measuring position, and is provided with a plurality of orifice fixing bolt holes, a plurality of detecting rod fixing plate fixing bolt holes, a magnetic displacement sensor fixing hole and a protective cover mounting position; the orifice fixing bolt hole is positioned on the orifice base, is close to the extension and is larger than the diameter of a drilled hole at the measuring position; the fixed hole of the magneto displacement sensor is positioned in the center of the orifice base, and the size of the opening of the fixed hole is matched with the outer diameter of the detection rod and is smaller than the diameter of the fixed disc of the detection rod;
the protective cover is detachably arranged on the protective cover mounting position of the orifice base and covers the detection rod fixing disc and the measuring circuit; the top of the protective cover is also provided with an opening through which a power line and a signal transmission cable pass;
the data acquisition equipment is connected with the measuring circuit through a signal transmission cable.
2. The system as claimed in claim 1, wherein the magnet is a circular magnetic ring structure or a polygonal magnetic ring structure or an irregular shaped magnetic ring structure customized according to measurement needs.
3. The system of claim 1, wherein the protective tube further comprises a magnet anchor point disposed on an outer wall of the tube; the magnet positioning points are corresponding points of measuring positions in the drill hole on the protective pipe, wherein the corresponding points are made according to measuring requirements and/or measuring experience.
4. The system of claim 1, wherein the probe rod retaining disk is bolted to the port base.
5. The system of any one of claims 1 to 4, wherein the data acquisition device comprises a data record storage circuit and a data display output circuit connected to each other.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110375631A (en) * | 2019-08-09 | 2019-10-25 | 基康仪器股份有限公司 | A kind of multi-point displacement measurement system and method based on mangneto displacement sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110375631A (en) * | 2019-08-09 | 2019-10-25 | 基康仪器股份有限公司 | A kind of multi-point displacement measurement system and method based on mangneto displacement sensor |
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