CN204854948U - Multistage vibrations detector based on electromagnetic induction - Google Patents
Multistage vibrations detector based on electromagnetic induction Download PDFInfo
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- CN204854948U CN204854948U CN201520574583.9U CN201520574583U CN204854948U CN 204854948 U CN204854948 U CN 204854948U CN 201520574583 U CN201520574583 U CN 201520574583U CN 204854948 U CN204854948 U CN 204854948U
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Abstract
The utility model relates to a multistage vibrations detector based on electromagnetic induction, this detector of its characterized in that includes first order vibrations detection device and second level vibrations detection device, second level vibrations detection device is located first order vibrations detection device's top, and first order vibrations detection device passes through fixing bolt with second level vibrations detection device and is connected, first order vibrations detection device includes first order vibrations detection device shell, first order vibrations pilot lamp, magnet stand, magnet, coil support frame, coil, switching -over module and rechargeable battery, first order vibrations detection device shell is square shell, installs rotary switch, first order vibrations pilot lamp demonstration mouth, rechargeable battery shell and first order vibrations detection device safety lock on the first order vibrations detection device shell, rotary switch includes first order vibrations detection device control switch and second level vibrations detection device control switch, and first order vibrations detection device control switch one end is connected with the switching -over module.
Description
Technical field
The utility model relates to viberation detector technical field, specifically relates to a kind of multistage vibration detector based on electromagnetic induction.
Background technology
Vibrations are one of inherent characteristics of plant equipment, but the strenuous vibration of plant equipment may cause device damage, or require the vibration amplitude of opertaing device under some running environment, so the shock detection of plant equipment is the procedure that industrial normal need carry out.Further, mechanical shock, as a kind of mechanical motion, contains huge energy, if can be used, will be a great wealth concerning the mankind.The direct utilization factor of vibration energy is relatively low, can consider to be translated into electric energy to use.
Vibration detector, as the term suggests the device being just used to checkout equipment vibrations.Utility model patent CN203929349U discloses a kind of circuit board viberation detector, give out a kind of apparatus structure being specifically designed to circuit board shock detection, this device with strong points, the shock detection of circuit board can only be used for, corresponding explanation is not provided for the miscellaneous equipment beyond circuit board, so be not suitable for widespread use.Utility model patent CN203798446U discloses a kind of shock detection circuit, propose a kind of for detecting the circuit structure that vibrations exist, the use prerequisite of this circuit structure needs extraneous power supply to power, there is no self-powered circuit design, battery discarded in shock detection circuit can cause the waste of resource and the pollution of environment, does not meet the theory of green, environmental protection.As can be seen here, existing vibration detector also also exists the narrow shortcomings with effectively utilizing mechanical energy of range of applicability.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of multistage vibration detector based on electromagnetic induction.This detecting device, based on electromagnetic induction principle, is made in conjunction with photoelectric effect and conductive electrolyte solution principle simultaneously, reasonable in design, detect accurately and the mechanical energy that vibrations produce can be converted to electric energy, and the scope of application of shock detection is wider.
The utility model solve the technical problem the technical scheme taked: provide a kind of multistage vibration detector based on electromagnetic induction, it is characterized in that this detecting device comprises first order viberation detector and second level viberation detector; Second level viberation detector is positioned at the top of first order viberation detector, and first order viberation detector is connected by set bolt with second level viberation detector;
Described first order viberation detector comprises first order viberation detector shell, the first order vibrations pilot lamp, magnet support, magnet, coil support frame, coil, inverting module and rechargeable battery; Described first order viberation detector shell is square shell, first order viberation detector shell is provided with rotary switch, the display of the first order vibrations pilot lamp mouth, rechargeable battery shell and first order viberation detector safety lock; Described rotary switch comprises first order viberation detector gauge tap and second level viberation detector gauge tap, and first order viberation detector gauge tap one end is connected with inverting module, and the other end and the first order shake pilot lamp and be connected; Viberation detector gauge tap one end, the second level is connected with the positive pole of rechargeable battery, and the other end is connected with second level viberation detector; Described first order vibrations pilot lamp display mouth is that glass is made, and is provided with rechargeable battery in described rechargeable battery shell; Described first order viberation detector safety lock is arranged on the left side of first order viberation detector outer casing frontispiece;
Described inverting module is made up of commutator, signal amplifier and photoresistance; Described first order vibrations pilot lamp comprises first order vibrations electromagnetism pilot lamp and first order vibrations photoelectricity pilot lamp; First order vibrations electromagnetism pilot lamp one end ground connection, the other end is connected on coil by inverting module; First order vibrations photoelectricity pilot lamp one end ground connection, the other end is connected on rechargeable battery positive pole through photoresistance; First order vibrations electromagnetism pilot lamp and first order vibrations photoelectricity pilot lamp are all fixed in first order viberation detector shell, and user can pass through the instruction result that first order vibrations pilot lamp display mouth observes first order vibrations electromagnetism pilot lamp and first order vibrations photoelectricity pilot lamp;
Six faces of the inside of described first order viberation detector shell are all fixed with a magnet support, the inner side of magnet support be one can be freely movable bracket buckle, be connected and fixed a magnet by this bracket buckle, have six magnet, described coil support frame is made up of six springs, square carbon fiber line coil support and four light barriers, and one end of each spring is fixed on a magnet, and the other end is connected with a side of carbon fiber line coil support, before carbon fiber line coil support, after, left, right four sides are equipped with a light barrier, and the light barrier on leading flank and trailing flank respectively has a light hole, two light hole height are equal, carbon fiber line coil support overhung has light emitting diode, the positive pole of this light emitting diode is connected with the positive pole of rechargeable battery, negative pole is connected with first order viberation detector gauge tap, the magnet of leading flank is provided with a photoresistance, and photoresistance and described light hole contour, light emitting diode can be irradiated in photoresistance when carbon fiber line coil support does not move, described coil comprises three groups of coils altogether, and three groups of coils are mutually perpendicular to be respectively wrapped on carbon fiber line coil support, wherein often organizes coil and is 100-200 circles, the single-turn circular coil often organizing coil is made up of two symmetrical half square coils, the two ends of two and half square coils are vertically connected on a wire respectively, then the two ends of all half square coils of one group of coil are connected on corresponding wire respectively, totally two wires, one end of every bar wire is as terminals, article two, wire totally two terminals, these two terminals are connected with two input ends of commutator respectively, coil is in the magnetic field that six magnet are formed, described commutator is made up of the diode of three groups of reverse parallel connections, the diode often organizing reverse parallel connection comprises four diodes, in four diodes, one end of the diode of two different directions connects, form a commutator input end, the diode often organizing reverse parallel connection comprises two input ends, these two input ends are connected with one group of coil, in the individual diode of the diode of three groups of reverse parallel connections, equidirectional diode is connected, form the output terminal of two commutators, two output terminals of this commutator are connected with two input ends of signal amplifier, two output terminals of signal amplifier shake electromagnetism pilot lamp, rechargeable battery with the first order simultaneously and shake photoelectricity pilot lamp through photoresistance and the first order in parallel, and rechargeable battery and the first order shake to install between electromagnetism pilot lamp and do not allow electric current to flow to by rechargeable battery the diode that the first order shakes electromagnetism pilot lamp, the minus earth of rechargeable battery, the power end of signal amplifier is directly connected with the both positive and negative polarity of rechargeable battery,
Described second level viberation detector comprises second level viberation detector hemispherical shell, electrode, alarm, domed vessel, electrolyte solution and second level vibrations pilot lamp; Described second level viberation detector hemispherical shell is directly buckled in above domed vessel, fixed by the upper surface of set bolt by second level viberation detector hemispherical shell and first order viberation detector shell, second level viberation detector hemispherical shell outside surface be provided with alarm amplify mouth and the second level vibrations pilot lamp display mouth, and have the shock levels of each pilot lamp luminescence representative at the other mark of second level vibrations pilot lamp display mouth, described second level vibrations pilot lamp display mouth is that glass is made; Described domed vessel inside has arc space, and electrolyte solution is contained in this arc space, and the top of arc space is provided with solution inlet; Described electrode comprises a positive electrode and three negative electrodes, positive electrode is arranged on the bottom in domed vessel arc space, and all the time with electrolyte solution contacts, three negative electrodes are arranged on the differing heights of domed vessel respectively, each negative electrode fixes a circle along the inwall of domed vessel on sustained height, and is connected to exterior negative electrode pole interface by lead-in wire; Electrolyte solution contacts with positive electrode all the time under not vibrating state, but does not contact any negative electrode; Described alarm is arranged in the space between second level viberation detector hemispherical shell and domed vessel, and it is adjacent with the alarm mouth that amplifies, alarm is the connecting circuit of hummer and triode, the positive pole of alarm is an alarm plug, this alarm plug requires to be connected on different negative electrode interface according to the warning of user, and the negative pole of alarm is connected with the negative pole of rechargeable battery; Described second level vibrations pilot lamp has 3 light emitting diodes, and the positive pole of 3 light emitting diodes is connected on three negative electrodes respectively, and the negative pole of 3 light emitting diodes is all connected with the negative pole of rechargeable battery.
The beneficial effects of the utility model are:
1, the utility model detects the vibrations of measured device according to two kinds of shock detection principles based on the multistage vibration detector of electromagnetic induction.Wherein based on based on electromagnetic induction principle simultaneously in conjunction with the first order viberation detector of photoelectric effect principle, be auxiliary to adopt the second level viberation detector of conductive electrolyte solution principle, and two-stage viberation detector combines and makes the shock detection of this device wider, testing result is more accurate.
2, mechanical shock can be converted into electric energy based on the multistage vibration detector of electromagnetic induction and use by the utility model, and environmental protection, utilization of mechanical energy rate are high, solve the frequent puzzlement changing battery.
3, the utility model can detect the shock levels of measured device based on second level viberation detector in the multistage vibration detector of electromagnetic induction, and relies on this function setting to shake warning function, greatly facilitates the examination and repair of staff.
4, the utility model can effectively solve induction electromotive force alternation and less unserviceable problem based on the inverting module of first order viberation detector in the multistage vibration detector of electromagnetic induction.
5, the utility model is very common in life based on all elements of the multistage vibration detector of electromagnetic induction, and staff also can utilize the easy pick-up unit of Cleaning Principle manufacture of the present utility model.
The multistage vibration detector based on electromagnetic induction of the utility model design has two-stage viberation detector, and second level viberation detector can be divided into 3 grades by the large young pathbreaker's vibrations of vibration amplitude.First order viberation detector is based on electromagnetic induction and realize shock detection in conjunction with photoelectric effect principle.Second level viberation detector realizes shock detection according to conductive electrolyte solution principle, and is divided into 3 grades according to the vibrations of large young pathbreaker's measured device of vibration amplitude.And, the multistage vibration detector based on electromagnetic induction of the utility model design relies on second level viberation detector can detect the Functional Design of shock levels vibrations warning function, user can arrange the highest shock levels of measured device according to the condition of work of measured device, when reaching this grade, device sends warning.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Fig. 1 is the perspective view of the utility model based on the multistage vibration detector of electromagnetic induction.
The sectional view of Fig. 2 when to be the utility model static based on the multistage vibration detector of electromagnetic induction.
Fig. 3 is the utility model based on the multistage vibration detector coil support frame of electromagnetic induction and coil winding figure.
Fig. 4 is the circuit loop of the utility model based on the multistage vibration detector first order viberation detector of electromagnetic induction.
Fig. 5 is the circuit loop of the utility model based on the multistage vibration detector second level viberation detector of electromagnetic induction.
Sectional view when Fig. 6 is the utility model many vibrations of the multistage vibration detector based on electromagnetic induction.
In figure, I, first order viberation detector; II, second level viberation detector; 1, rotary switch; 1-1, first order viberation detector gauge tap; 1-2, second level viberation detector gauge tap; 2, first order vibrations pilot lamp display mouth; 2-1, first order vibrations electromagnetism pilot lamp display mouth; 2-2, first order vibrations photoelectricity pilot lamp display mouth; 3, rechargeable battery shell; 4, second level vibrations pilot lamp display mouth; 5, alarm amplifies mouth; 6, set bolt; 7, first order viberation detector shell; 8, rechargeable battery; 9, first order vibrations pilot lamp; 9-1, first order vibrations electromagnetism pilot lamp; 9-2, first order vibrations photoelectricity pilot lamp; 10, inverting module; 10-1, commutator; 10-2, signal amplifier; 10-3, photoresistance; 11, magnet; 12, magnet support; 13, coil; 14, coil support frame; 14-1, spring; 14-2, carbon fiber line coil support; 14-3, light barrier; 14-3-A, light hole; 15, alarm; 15-1, hummer; 15-2, alarm plug; 16, second level vibrations pilot lamp; 17, electrode; 17-1,3 grades of negative electrodes; 17-2,2 grades of negative electrodes; 17-3,1 grade of positive and negative electrode; 17-4 positive electrode; 18, electrolyte solution; 19, domed vessel; 20, solution inlet; 21, second level viberation detector hemispherical shell; 22, first order viberation detector safety lock.
Embodiment
The utility model comprises first order viberation detector I and second level viberation detector II based on the multistage vibration detector (being called for short detecting device, see Fig. 1-5) of electromagnetic induction; Second level viberation detector II is positioned at the top of first order viberation detector I, and first order viberation detector I is connected by set bolt 6 with second level viberation detector II;
Described first order viberation detector I comprises first order viberation detector shell 7, the first order vibrations pilot lamp 9, magnet support 12, magnet 11, coil support frame 14, coil 13, inverting module 10 and rechargeable battery 8; Described first order viberation detector shell 7 is square aluminium shell, first order viberation detector shell 7 is provided with rotary switch 1, the display of the first order vibrations pilot lamp mouth 2, rechargeable battery shell 3 and first order viberation detector safety lock 22; Described rotary switch 1 comprises first order viberation detector gauge tap 1-1 and second level viberation detector gauge tap 1-2, first order viberation detector gauge tap 1-1 one end is connected with inverting module 10, and the other end and the first order shake pilot lamp 9 and be connected; Viberation detector gauge tap 1-2 one end, the second level is connected with the positive pole of rechargeable battery 8, and the other end is connected with second level viberation detector II; Described first order vibrations pilot lamp display mouth 2 is made for glass, is provided with rechargeable battery 8 in described rechargeable battery shell 3; Described first order viberation detector safety lock 22 is arranged on the left side in first order viberation detector shell 7 front;
Described inverting module 10 is made up of commutator 10-1, a signal amplifier 10-2 and photoresistance 10-3, and described first order vibrations pilot lamp 9 comprises first order vibrations electromagnetism pilot lamp 9-1 and first order vibrations photoelectricity pilot lamp 9-2.First order vibrations electromagnetism pilot lamp 9-1 one end ground connection, the other end is connected on coil 13 by inverting module 10; First order vibrations photoelectricity pilot lamp 9-2 one end ground connection, the other end is connected on the positive pole of rechargeable battery 8 through photoresistance; First order vibrations electromagnetism pilot lamp 9-1 and first order vibrations photoelectricity pilot lamp 9-2 is all fixed in first order viberation detector shell 7, and user can pass through the instruction result that first order vibrations pilot lamp display mouth 2 observes first order vibrations electromagnetism pilot lamp 9-1 and first order vibrations photoelectricity pilot lamp 9-2;
Six faces of the inside of described first order viberation detector shell 7 are all fixed with a magnet support 12, the inner side of magnet support 12 be one can be freely movable bracket buckle, be connected and fixed a magnet 11 by this bracket buckle, have six magnet 11; Described coil support frame 14 is made up of six spring 14-1, a square carbon fiber line coil support 14-2 and four light barrier 14-3, and one end of each spring 14-1 is fixed on a magnet 13, and the other end is connected with a side of carbon fiber line coil support 14-2; The side, four, front, rear, left and right of carbon fiber line coil support 14-2 is equipped with a light barrier 14-3, and light barrier 14-3 on leading flank and trailing flank respectively has a light hole 14-3-A, two light hole height are equal, carbon fiber line coil support 14-2 overhung has light emitting diode, the positive pole of this light emitting diode is connected with the positive pole of rechargeable battery 8, and negative pole is connected with first order viberation detector gauge tap 1-1; The magnet of leading flank is provided with a photoresistance 10-3, and photoresistance 10-3 and described light hole 14-3-A is contour, light emitting diode can be irradiated on photoresistance 10-3 when carbon fiber line coil support 14-2 does not move; Described coil 13 comprises three groups of coils altogether, and three groups of coils are mutually perpendicular to be respectively wrapped on carbon fiber line coil support 14-2, wherein often organizes coil and is 100-200 circles; The single-turn circular coil often organizing coil is made up of two symmetrical half square coils, the two ends of two and half square coils are vertically connected on a wire respectively, then the two ends of all half square coils of one group of coil are connected on corresponding wire respectively, totally two wires, one end of every bar wire is as terminals, article two, wire totally two terminals, these two terminals are connected with two input ends of commutator 10-1 respectively; Coil 13 is in the magnetic field that six magnet are formed; Described commutator 10-1 is made up of the diode of three groups of reverse parallel connections, the diode often organizing reverse parallel connection comprises four diodes, in four diodes, one end of the diode of two different directions connects, form a commutator input end, the diode often organizing reverse parallel connection comprises two input ends, these two input ends are connected with one group of coil 13, in 12 diodes of the diode of three groups of reverse parallel connections, equidirectional diode is connected, form the output terminal of two commutators, two output terminals of this commutator 10-1 are connected with two input ends of signal amplifier 10-2; Two output terminals of signal amplifier 10-2 shake electromagnetism pilot lamp 9-1, rechargeable battery 8 simultaneously and shake photoelectricity pilot lamp 9-2 through photoresistance 10-3 and the first order in parallel with the first order, and rechargeable battery 8 and the first order shake to install between electromagnetism pilot lamp 9-1 and do not allow electric current to flow to by rechargeable battery 8 diode that the first order shakes electromagnetism pilot lamp 9-1, the minus earth of rechargeable battery 8; The power end of signal amplifier 10-2 is directly connected with the both positive and negative polarity of rechargeable battery 8;
Described second level viberation detector II comprises second level viberation detector hemispherical shell 21, electrode 17, alarm 15, domed vessel 19, electrolyte solution 18 and second level vibrations pilot lamp 16; Described second level viberation detector hemispherical shell 21 is directly buckled in above domed vessel 19, by set bolt 6, the upper surface of second level viberation detector hemispherical shell 21 with first order viberation detector shell 7 is fixed, second level viberation detector hemispherical shell 21 outside surface be provided with alarm amplify mouth 5 and the second level vibrations pilot lamp display mouth 4, and have the shock levels of each pilot lamp luminescence representative at the other mark of second level vibrations pilot lamp display mouth 4, described second level vibrations pilot lamp display mouth 4 is made for glass; Described domed vessel 19 inside has arc space, and electrolyte solution 18 is contained in this arc space, and the top of arc space is provided with solution inlet 20; Described electrode 17 comprises positive electrode 17-4 and three negative electrode, positive electrode 17-4 is arranged on the bottom in domed vessel 19 arc space, and contact with electrolyte solution 18 all the time, three negative electrodes are arranged on the differing heights of domed vessel 19 respectively, each negative electrode fixes a circle along the inwall of domed vessel 19 on sustained height, and is connected to exterior negative electrode pole interface by lead-in wire; Electrolyte solution 18 contacts with positive electrode all the time under not vibrating state, but does not contact any negative electrode; Described alarm 15 is arranged in the space between second level viberation detector hemispherical shell 21 and domed vessel 19, and it is adjacent with the alarm mouth 5 that amplifies, alarm 15 is the connecting circuit of hummer and triode, the positive pole of alarm 15 is alarm plugs, this alarm plug requires to be connected on different negative electrode interface according to the warning of user, and the negative pole of alarm 15 is connected with the negative pole of rechargeable battery 8; Described second level vibrations pilot lamp 16 has 3 light emitting diodes, and the positive pole of 3 light emitting diodes is connected on three negative electrodes respectively, and the negative pole of 3 light emitting diodes is all connected with the negative pole of rechargeable battery 8.
Embodiment shows as shown in Figure 1, and the utility model comprises first order viberation detector I and second level viberation detector II based on the multistage vibration detector of electromagnetic induction.First order viberation detector I is positioned at the below of second level viberation detector II, first order viberation detector I is connected by set bolt 6 with second level viberation detector II, and the upper surface of second level viberation detector hemispherical shell 21 with first order viberation detector shell 7 is fixed by set bolt 6.First order viberation detector shell 7 is square aluminium shell, is provided with rotary switch 1, the display of the first order vibrations pilot lamp mouth 2, rechargeable battery shell 3 and first order viberation detector safety lock 22 on the surface.Rotary switch 1 comprises first order viberation detector gauge tap 1-1 and second level viberation detector gauge tap 1-2.First order viberation detector gauge tap 1-1 one end is connected with inverting module 10, and the other end and the first order shake pilot lamp 9 and be connected.First order viberation detector gauge tap 1-1 rotates to " ON " shelves, rechargeable battery 8 and two first order shake pilot lamp 9 (comprise the first order shake electromagnetism pilot lamp 9-1 and the first order shakes photoelectricity pilot lamp 9-2) loop can conducting, and is energized as the light emitting diode of photoresistance 10-3 illumination source.Viberation detector gauge tap 1-2 one end, the second level is connected with the positive pole of rechargeable battery 8, and the other end is connected with the positive electrode 17-4 bottom electrolyte solution 18.Second level viberation detector gauge tap 1-2 rotates to " ON " shelves, and the voltage of rechargeable battery 8 is added in the positive and negative electrode both sides of second level viberation detector II, and second level vibrations pilot lamp 16 and alarm 15 can work.First order vibrations pilot lamp display mouth 2 is made for glass, comprises first order vibrations electromagnetism pilot lamp display mouth 2-1 and first order vibrations photoelectricity pilot lamp shows mouth 2-2, observes the testing result of first order viberation detector I for user.Rechargeable battery shell 3 is for the protection of rechargeable battery 8.Rechargeable battery 8 is placed in rechargeable battery shell 3, if rechargeable battery fault, can open rechargeable battery shell 3 and carry out changing or keeping in repair.Second level viberation detector hemispherical shell 21 is provided with second level vibrations pilot lamp display mouth 4 and alarm amplifies mouth 5, and the other shock levels indicating each representative of second level vibrations pilot lamp 16 of second level vibrations pilot lamp display mouth 4, be divided into 1 grade, 2 grades and 3 grades.Second level vibrations pilot lamp display mouth 2 is made for glass, and user can pass through second level vibrations pilot lamp and shows the testing result that mouth 2 observes second level viberation detector II.The alarm mouth 5 that amplifies is some apertures in second level viberation detector hemispherical shell 21.When the shock levels of measured device reaches the alarm level of user's setting, alarm 15 sends the sound, and user can check or inactive measured device.
Embodiment shows as shown in Figure 2, and the utility model comprises the first order viberation detector shell 7 of first order viberation detector I, rechargeable battery 8, the domed vessel 19 of the first order vibrations pilot lamp 9, inverting module 10, magnet 11, magnet support 12, coil 13, coil support frame 14 and second level viberation detector, solution inlet 20, shell 21, the second level vibrations pilot lamp 16, alarm 15, electrode 17, electrolyte solution 18 based on the multistage vibration detector of electromagnetic induction.In first order viberation detector I, magnet 11 is fixed on first order viberation detector shell 7 by magnet support 12.Magnet support 12 is screwed on first order viberation detector shell 7, inner side be one can be freely movable bracket buckle, be fixed by bracket buckle after magnet 11 installation.The magnet 11 that the magnet support 12 be connected with first order viberation detector shell 7 upper surface, left surface and rear surface is installed is N pole towards coil, and the N pole of the magnet namely upper surface, left surface and rear surface are connected is towards the center of first order viberation detector shell 7; The magnet 11 that the magnet support 12 be connected with first order viberation detector shell 7 lower surface, right surface, front surface is installed is S pole towards coil, the S pole of the magnet namely lower surface, right surface, front surface connected is towards the center of first order viberation detector shell 7, and these six magnet 11 form the magnetic field that first order viberation detector needs.Coil 13 is wrapped on carbon fiber line coil support 14-2.Carbon fiber line coil support 14-2 selects carbon fibre material to be because carbon fiber line coil support lighter weight on the one hand, can not affect the vibrations of measured device because of the weight of carbon fiber line coil support; Be because carbon fiber line coil support is non-conductive on the other hand, the induction electromotive force that coil produces can not form loop on coil brace and carbon fiber line coil support can not produce induction electromotive force by cutting magnetic induction line.Concrete coil connected mode embodiment as shown in Figure 3.Carbon fiber line coil support 14-2 is connected by spring 14-1 with magnet 11, the restoring force that spring 14-1 can provide coil 13 to move, and ensure measured device microseism, coil 13 can produce induction electromotive force.The induction electromotive force that coil 13 produces charges to rechargeable battery 8 through inverting module 10, and powers to first order vibrations electromagnetism pilot lamp 9-1.Spring 14-1 one end is fixed on magnet 11, and the other end is connected with carbon fiber line coil support 14-2.Light barrier 14-3 is plastics light barrier, selects plastics light barrier to be that it does not produce induction electromotive force in addition because plastic material light weight and light tight.Carbon fiber line coil support 14-2 tetra-sides are provided with light barrier 14-3, light barrier 14-3 on leading flank and trailing flank is respectively provided with a light hole 14-3-A, two light hole height are equal, when coil support frame 14 does not move, the light transmission light hole of the light emitting diode in coil support frame 14 impinges upon in photoresistance, and now photoresistance resistance is very large.If coil support frame 14 shakes, the light of light emitting diode can not through light hole, and photoresistance resistance now diminishes, loop conducting, and 9-2 is luminous for first order vibrations photoelectricity pilot lamp.Photoresistance selects incident light weak, and resistance reduces, incident intensity, the photoresistance of resistance increase type.Coil 13 is wrapped in the outside of light barrier 14-3.
Second level viberation detector shell 21 is square aluminium shell, and lighter weight and toughness are strong, can available protecting internal components.Domed vessel 19 is semisphere, and arc bottom base is arranged at bottom, and form arc space on domed vessel 19 top, in this arc space, hold electrolyte solution 18, arc space top is provided with solution inlet 20.Solution inlet 20 conveniently can add and topple over electrolyte solution 18.Electrolyte solution 18 uses for a long time, needs to be changed by solution inlet 20.Electrode 17 comprises 3 grades of negative electrode 17-1,2 grades of negative electrode 17-2,1 grade of negative electrode 17-3 and positive electrode 17-4.Three negative electrodes are arranged on the differing heights of domed vessel 19 inwall respectively with shock detection grade size, and three negative electricity very sheet, fix a circle along domed vessel 19 inwall, ensure the vibrations in any one direction, pick-up unit can detect.Positive electrode 17-4 is arranged on the bottom in the arc space of domed vessel 19, effectively contacts with electrolyte solution 18.Second level vibrations pilot lamp 16 is made up of three light emitting diodes, and the positive pole of three light emitting diodes is connected on three negative electrodes respectively, and the negative pole of three light emitting diodes is connected with the negative pole of rechargeable battery 8.When device vibrations make solution contact with negative electrode, loop conducting, second level vibrations pilot lamp 16 is luminous.The positive pole of alarm 15 is alarm plug 15-2, is selected to be connected from different negative electrode by user, reports to the police, be then connected with 2 grades of negative electrode 17-2 by alarm plug 15-2 if user selects shock levels to reach 2 grades of timers.The other end of alarm 15 is connected with the negative pole of rechargeable battery 8 all the time.When shock levels reaches set alarm level, alarm 15 is reported to the police.
When vibrations do not occur first order viberation detector I, coil is in just position by its deadweight and the pulling force of spring, and the magnetic field in coil and any direction does not have relative motion, does not produce induction electromotive force.Further, the light that light emitting diode sends is mapped in photoresistance by light hole, and photoresistance resistance is very large.Electrolyte solution in the viberation detector II of the second level does not contact with arbitrary negative electrode, and second level vibrations pilot lamp extinguishes.
Embodiment shows as shown in Figure 3, and carbon fiber line coil support 14-2 is the square support be made up of 12 carbon fiber cylindrical bars, three groups of coils 13 between two mutually vertical wrap on carbon fiber line coil support 14-2.Carbon fiber line coil support 14-2 tetra-sides are provided with light barrier 14-3, and the light barrier 14-3 on leading flank is provided with a light hole 14-3-A.In the coil connecting structure of the utility model design, the coil 13 that each plane is wound around can detect the vibrations of measured device both direction, and namely one group of coil can cut the magnetic induction line in two vibrations directions and produce induction electromotive force.The coil that XY axial plane is wound around can detect the vibrations of measured device vertical direction and fore-and-aft direction.When measured device vertically shake by (front and back) direction, coil side cutting N pole, the left surface magnet not installing commutator, to the magnetic field of right surperficial S pole magnet (upper surface N pole magnet is to lower surface S pole magnet), produces induction electromotive force.Be wrapped in coil on YZ axial plane and can detect the vibrations of measured device fore-and-aft direction and left and right directions.Before and after measured device during the vibrations of (left and right) direction, what be wrapped in YZ axial plane coil does not install commutator coil side cutting N pole, left surface magnet to the magnetic field of right surperficial S pole magnet (N pole, rear surface magnet is to front surface S pole magnet), produces induction electromotive force.The coil that XZ axial plane is wound around can detect the vibrations of measured device vertical direction and left and right directions.When measured device vertically shake by (left and right) direction, coil side cutting N pole, the left surface magnet not installing commutator in the coil that XZ axial plane is wound around, to the magnetic field of right surperficial S pole magnet (upper surface N pole magnet is to lower surface S pole magnet), produces induction electromotive force.Due to to-and-fro movement during vibrations, the induction electromotive force that coil produces is alternation, and an innovative point of the present utility model is that to introduce commutator in detecting device alternating electromotive force rectification be direct electromotive force..
Embodiment shows as shown in Figure 4, and coil 13 produces induction electromotive force and powers to first order vibrations electromagnetism pilot lamp 9-1 through inverting module 10, and charges to rechargeable battery 8.Inverting module 10 comprises commutator 10-1 and signal amplifier 10-2 and photoresistance 10-3.Vibrations due to coil are to-and-fro movement, the induction electromotive force that coil produces is alternating electromotive force, and first order vibrations pilot lamp 9 and rechargeable battery 8 all need direct current, so the utility model design commutator 10-1 carries out rectification to the alternation induction electromotive force produced.The commutator 10-1 often organizing coil 13 comprises the diode of one group of reverse parallel connection, the diode often organizing reverse parallel connection comprises four diodes, in four diodes, one end of the diode of two different directions connects, form a commutator input end, the diode often organizing reverse parallel connection comprises two input ends, these two input ends are connected with one group of coil 13, in 12 diodes of the diode of three groups of reverse parallel connections, equidirectional diode is connected, form the output terminal of two commutators, two output terminals of this commutator 10-1 are connected with two input ends of signal amplifier 10-2, the induction electromotive force that coil 13 cutting magnetic induction line produces is less, and the utility model modelled signal amplifier 10-2 amplifies induction electromotive force.Signal amplifier 10-2 is transistor amplifier common on market, and amplification stage can require to change transistor parameter according to measurement.The output of signal amplifier 10-2 is connected on the two ends of first order vibrations electromagnetism pilot lamp 9-1.If coil produces induction electromotive force, be first direct current by commutator 10-1 rectification, after after signal amplifier 10-2 amplifies, be connected on first order vibrations electromagnetism pilot lamp 9-1 two ends, 9-1 is luminous for first order vibrations electromagnetism pilot lamp.9-1 is in parallel with rechargeable battery 8 for first order vibrations electromagnetism pilot lamp, while first order vibrations electromagnetism pilot lamp 9-1 luminescence, rechargeable battery 8 charges, for preventing rechargeable battery 8 couples of first order vibrations electromagnetism pilot lamp 9-1 electric discharge, rechargeable battery 8 and the first order shake between electromagnetism pilot lamp 9-1 and design the diode preventing current reflux.The power end of signal amplifier 10-2 is directly connected with the both positive and negative polarity of rechargeable battery 8 (not drawing in figure), and needed for signal amplifier 10-2, power supply is provided by rechargeable battery 8.First order vibrations photoelectricity pilot lamp 9-2 loop provides power supply by rechargeable battery 8, the minus earth of rechargeable battery 8.When photoresistance 10-3 detects illumination source, the resistance value of photoresistance 10-3 is very big, does not almost have electric current to flow through in loop, and 9-2 is not luminous for first order vibrations photoelectricity pilot lamp.If measured device shakes, light barrier 14-3 blocks the illumination of light emitting diode, and the resistance value of photoresistance 10-3 diminishes, and electric current flows through first order vibrations photoelectricity pilot lamp 9-2, and 9-2 is luminous for first order vibrations photoelectricity pilot lamp, detects that vibrations occur.
Embodiment shows as shown in Figure 5, and the second level vibrations pilot lamp 16 of second level viberation detector and alarm 15 power supply are provided by rechargeable battery 8.During device debugging, the alarm level of first selector vibrations, by alarm plug 15-2 and respective negative Electrode connection.Between the device operating period, second level viberation detector gauge tap 1-2 rotates to " ON " shelves, and the voltage of rechargeable battery 8 is added in positive electrode and negative electrode both sides.If due to measured device vibrations, make electrolyte solution connect between positive electrode and negative electrode, loop conducting, corresponding second level vibrations pilot lamp is luminous.If the vibrations of measured device reach alarm level, alarm 15 sends warning.
Embodiment shows as shown in Figure 6, when the utility model detects that measured device shakes to the right based on the multistage vibration detector of electromagnetic induction, the coil 13 in first order viberation detector and the electrolyte solution 18 in the viberation detector of the second level are because inertia effect is to left movement.The motion of first order viberation detector coil 13 makes spring 14-1 that deformation occur.Due to left movement, embodiment illustrates as shown in Figure 3, the coil 13 being wrapped in YZ axial plane does not pacify coil side cutting N pole, the rear surface magnet of commutator 10-1 to the magnetic field of front surface S pole magnet, produces induction electromotive force.The coil side cutting upper surface N pole magnet not installing commutator 10-1 in the coil 13 that XZ axial plane is wound around, to the magnetic field of lower surface S pole magnet, produces induction electromotive force.The induction electromotive force superposition that two coils produce, is powered to first order vibrations electromagnetism pilot lamp 9-1 by signal amplifier 10-2, and 9-1 is luminous for first order vibrations electromagnetism pilot lamp, illustrates that measured device shakes.Further, signal amplifier 10-2 is charged to rechargeable battery 8 by commutator 10-1, is electric energy, for this device the changes mechanical energy of measured device vibrations.The illumination of light emitting diode is blocked in light barrier 14-3 motion, and the resistance value of photoresistance 10-3 diminishes, and rechargeable battery 8 is powered to first order vibrations photoelectricity pilot lamp 9-2, and 9-2 is luminous for first order vibrations photoelectricity pilot lamp, illustrates that measured device shakes.In the viberation detector of the second level, electrolyte solution 18 contacts to left movement with 2 grades of negative electrode 17-2,1 grade of negative electrode 17-3,1 grade of pilot lamp of second level vibrations pilot lamp and 2 grades of pilot lamp loop conductings, 1 grade, 2 grades pilot lamp luminescences, the vibrations representing measured device reach 2 grades of shock levels of this device detection.If the alarm level of user's setting is 2 grades, then alarm circuit conducting, alarm 15 sends warning.
Whether the utility model occurs for the vibrations detecting measured device based on the multistage vibration detector of electromagnetic induction, and judges the size of measured device shock levels.The result of the vibrations of the multistage vibration detector based on electromagnetic induction of the utility model design is divided into following several situation: 1. two first order vibrations pilot lamp 9 of first order viberation detector and the second level vibrations pilot lamp 16 of second level viberation detector all not luminous, the shockproof generation of measured device is described; 2. two first order vibrations pilot lamp 9 of first order viberation detector are luminous, the second level vibrations pilot lamp 16 of second level viberation detector is not luminous, illustrate that measured device has microseism, but be not enough to second level viberation detector electrolyte solution 18 is contacted with arbitrary negative electrode; 3. two first order vibrations pilot lamp 9 of first order viberation detector are luminous, and 1,2 or 3 grade of vibrations pilot lamp of the second level vibrations pilot lamp 16 of second level viberation detector is luminous, illustrate that measured device shakes, and shock levels is 1,2 or 3 grade.
The utility model based on the specific works flow process of the multistage vibration detector of electromagnetic induction is: before measured device detects, and user needs the alarm level arranging viberation detector according to the working condition of measured device.When this viberation detector uses, need first first order viberation detector gauge tap 1-1 and second level viberation detector gauge tap 1-2 to be rotated to " ON " shelves.When vibrations occur measured device, detecting device shakes together with measured device, and coil 13, light barrier 14-3 and electrolyte solution 18 move round about due to inertia effect.When even measured device is to left movement, coil does relative motion to the right, extruding right side spring, and YZ axial plane coil cutting N pole, rear surface magnet, to the magnetic field of front surface S pole magnet, produces induction current from top to bottom.XZ axial plane coil cutting upper surface N pole magnet, to the magnetic field of lower surface S pole magnet, produces induction current from outside to inside.The commutator 10-1 rectification of alternation induction electromotive force in inverting module 10 of two groups of coil generations is DC voltage, after signal amplifier 10-2 in inverting module 10 DC voltage is amplified, DC voltage after amplification can be first order vibrations electromagnetism pilot lamp 9-1 and powers, and can charge to rechargeable battery 8.9-1 is luminous for first order vibrations electromagnetism pilot lamp, and instruction measured device shakes.Light barrier 14-3 does relative motion to the right, blocks the illumination of light emitting diode directive photoresistance, and photoresistance 10-3 resistance reduces, and 9-2 is luminous for first order vibrations photoelectricity pilot lamp, and instruction measured device shakes.
Second level viberation detector also shakes with measured device.If measured device is to left movement, second level viberation detector follows measured device to left movement, domed vessel 19 internal electrolyte solution 18 moves right due to inertia, moves right the vibrations size according to measured device in process, and electrolyte solution 18 may contact with 1,2,3 grade of negative electrode.First electrolyte solution 18 contacts with 1 grade of negative electrode 17-3,1 grade of galvanic circle conducting, the electric current of rechargeable battery 8 flows through 1 grade of vibrations pilot lamp in second level vibrations pilot lamp 16, and 1 grade of vibrations pilot lamp is luminous, and user can see that measured device shock levels reaches 1 grade.If measured device vibrations continue aggravation, electrolyte solution 18 contacts with 2 grades of negative electrode 17-2,2 grades of galvanic circle conductings, and 2 grades of vibrations pilot lamp are luminous, and rechargeable battery 8 electric current flows through alarm 15, and alarm 15 sends warning.Whether the work that user can detect measured device is normal.
After the detection of measured device terminates, for saves energy, first order viberation detector gauge tap 1-1 and second level viberation detector gauge tap 1-1 is rotated to " OFF " shelves, at this moment, even if measured device shakes, in viberation detector, pilot lamp also can not be luminous.
Embodiment 1
The present embodiment adopts above-mentioned connected mode, and in first order viberation detector, magnet 11 selects 6 Nd-Fe-B permanent magnets, and its magnetic induction density is 0.7T.Carbon fiber line coil support 14-2 is square support, and monolateral length is 10cm, then the effective length of the single-turn circular coil of coil 13 in magnetic field is 10cm.Coil 13 selects copper wire wire to be wrapped on carbon fiber line coil support 14-2, often organizes coil totally 100 circles.During the vibrations of measured device either direction, there are two groups of coil cutting magnetic induction lines, produce induction electromotive force, both comprehensive, when calculating induction electromotive force, turn number N=100 × 2=200 circle.During measured device vibrations, coil velocity of vibration is very fast, and average velocity calculates according to 1cm/s, then the induction electromotive force E=NBLV=200 × 0.7 × 0.1 × 0.01=0.14V of measured device vibrations coil generation.
Signal amplifier parameter can according to the adjustment of measurement actual state, and the present embodiment adopts enlargement factor to be the signal amplifier of 100, and output signal can be made to be 100 times of input signal.Then output voltage U
0=100 × E=14V.Output voltage is added in first order vibrations electromagnetism pilot lamp 9-1 both sides, and 9-1 is luminous for first order vibrations electromagnetism pilot lamp, shows vibrations and occurs, reach the object of shock detection to user.Output voltage is added in rechargeable battery 8 both sides, charges to rechargeable battery 8, and rechargeable battery 8 can be powered to second level viberation detector II.
In the viberation detector of the second level, electrolyte solution 18 selects concentration to be the NaCl solution (NaCl solution conducts electricity very well and cost of manufacture is low) of 0.1mol/L.When the vibration amplitude of measured device reaches 1 grade, electrolyte NaCl solution contacts with 1 grade of negative electrode 17-1, Na
+ion dissociates to positive electrode by 1 grade of negative electrode, Cl
-ion dissociates to negative electrode by positive electrode, and 1 grade of vibrations pilot lamp loop conducting in second level vibrations pilot lamp 16, in second level vibrations pilot lamp 16,1 grade of vibrations pilot lamp is luminous.When measured device vibration amplitude reaches 2 grades, electrolyte NaCl solution all contacts with 1,2 grade of negative electrode, the Na near 1 grade and 2 grades of negative electrodes
+ion dissociates to positive electrode, Cl
-ion dissociates to negative electrode by positive electrode, 1 grade of vibrations pilot lamp and the equal conducting of 2 grades of vibrations pilot lamp loops in second level vibrations pilot lamp 16, two pilot lamp luminescences.If alarm level is set to 2 grades, now alarm circuit also conducting simultaneously.When the vibration amplitude of measured device reaches 3 grades, electrolyte NaCl solution all contacts with 1,2,3 grade of negative electrode, the Na near 1 grade, 2 grades, 3 grades negative electrodes
+ion dissociates to positive electrode, Cl
-ion dissociates to 3 negative electrodes by positive electrode, and 1 grade of vibrations pilot lamp, 2 grades of vibrations pilot lamp and the equal conducting of 3 grades of vibrations pilot lamp loops in second level vibrations pilot lamp 16, in second level vibrations pilot lamp 16,3 pilot lamp are all luminous.
In above-described embodiment, involved parts are by commercially available, and light emitting diode, resistance, signal amplifier, electrolyte solution, switch is known technology product.
Claims (1)
1., based on a multistage vibration detector for electromagnetic induction, it is characterized in that this detecting device comprises first order viberation detector and second level viberation detector; Second level viberation detector is positioned at the top of first order viberation detector, and first order viberation detector is connected by set bolt with second level viberation detector;
Described first order viberation detector comprises first order viberation detector shell, the first order vibrations pilot lamp, magnet support, magnet, coil support frame, coil, inverting module and rechargeable battery; Described first order viberation detector shell is square shell, first order viberation detector shell is provided with rotary switch, the display of the first order vibrations pilot lamp mouth, rechargeable battery shell and first order viberation detector safety lock; Described rotary switch comprises first order viberation detector gauge tap and second level viberation detector gauge tap, and first order viberation detector gauge tap one end is connected with inverting module, and the other end and the first order shake pilot lamp and be connected; Viberation detector gauge tap one end, the second level is connected with the positive pole of rechargeable battery, and the other end is connected with second level viberation detector; Described first order vibrations pilot lamp display mouth is that glass is made, and is provided with rechargeable battery in described rechargeable battery shell; Described first order viberation detector safety lock is arranged on the left side of first order viberation detector outer casing frontispiece;
Described inverting module is made up of commutator, signal amplifier and photoresistance; Described first order vibrations pilot lamp comprises first order vibrations electromagnetism pilot lamp and first order vibrations photoelectricity pilot lamp; First order vibrations electromagnetism pilot lamp one end ground connection, the other end is connected on coil by inverting module; First order vibrations photoelectricity pilot lamp one end ground connection, the other end is connected on rechargeable battery positive pole through photoresistance; First order vibrations electromagnetism pilot lamp and first order vibrations photoelectricity pilot lamp are all fixed in first order viberation detector shell, and user can pass through the instruction result that first order vibrations pilot lamp display mouth observes first order vibrations electromagnetism pilot lamp and first order vibrations photoelectricity pilot lamp;
Six faces of the inside of described first order viberation detector shell are all fixed with a magnet support, the inner side of magnet support be one can be freely movable bracket buckle, be connected and fixed a magnet by this bracket buckle, have six magnet, described coil support frame is made up of six springs, square carbon fiber line coil support and four light barriers, and one end of each spring is fixed on a magnet, and the other end is connected with a side of carbon fiber line coil support, before carbon fiber line coil support, after, left, right four sides are equipped with a light barrier, and the light barrier on leading flank and trailing flank respectively has a light hole, two light hole height are equal, carbon fiber line coil support overhung has light emitting diode, the positive pole of this light emitting diode is connected with the positive pole of rechargeable battery, negative pole is connected with first order viberation detector gauge tap, the magnet of leading flank is provided with a photoresistance, and photoresistance and described light hole contour, light emitting diode can be irradiated in photoresistance when carbon fiber line coil support does not move, described coil comprises three groups of coils altogether, and three groups of coils are mutually perpendicular to be respectively wrapped on carbon fiber line coil support, wherein often organizes coil and is 100-200 circles, the single-turn circular coil often organizing coil is made up of two symmetrical half square coils, the two ends of two and half square coils are vertically connected on a wire respectively, then the two ends of all half square coils of one group of coil are connected on corresponding wire respectively, totally two wires, one end of every bar wire is as terminals, article two, wire totally two terminals, these two terminals are connected with two input ends of commutator respectively, coil is in the magnetic field that six magnet are formed, described commutator is made up of the diode of three groups of reverse parallel connections, the diode often organizing reverse parallel connection comprises four diodes, in four diodes, one end of the diode of two different directions connects, form a commutator input end, the diode often organizing reverse parallel connection comprises two input ends, these two input ends are connected with one group of coil, in the individual diode of the diode of three groups of reverse parallel connections, equidirectional diode is connected, form the output terminal of two commutators, two output terminals of this commutator are connected with two input ends of signal amplifier, two output terminals of signal amplifier shake electromagnetism pilot lamp, rechargeable battery with the first order simultaneously and shake photoelectricity pilot lamp through photoresistance and the first order in parallel, and rechargeable battery and the first order shake to install between electromagnetism pilot lamp and do not allow electric current to flow to by rechargeable battery the diode that the first order shakes electromagnetism pilot lamp, the minus earth of rechargeable battery, the power end of signal amplifier is directly connected with the both positive and negative polarity of rechargeable battery,
Described second level viberation detector comprises second level viberation detector hemispherical shell, electrode, alarm, domed vessel, electrolyte solution and second level vibrations pilot lamp; Described second level viberation detector hemispherical shell is directly buckled in above domed vessel, fixed by the upper surface of set bolt by second level viberation detector hemispherical shell and first order viberation detector shell, second level viberation detector hemispherical shell outside surface be provided with alarm amplify mouth and the second level vibrations pilot lamp display mouth, and have the shock levels of each pilot lamp luminescence representative at the other mark of second level vibrations pilot lamp display mouth, described second level vibrations pilot lamp display mouth is that glass is made; Described domed vessel inside has arc space, and electrolyte solution is contained in this arc space, and the top of arc space is provided with solution inlet; Described electrode comprises a positive electrode and three negative electrodes, positive electrode is arranged on the bottom in domed vessel arc space, and all the time with electrolyte solution contacts, three negative electrodes are arranged on the differing heights of domed vessel respectively, each negative electrode fixes a circle along the inwall of domed vessel on sustained height, and is connected to exterior negative electrode pole interface by lead-in wire; Electrolyte solution contacts with positive electrode all the time under not vibrating state, but does not contact any negative electrode; Described alarm is arranged in the space between second level viberation detector hemispherical shell and domed vessel, and it is adjacent with the alarm mouth that amplifies, alarm is the connecting circuit of hummer and triode, the positive pole of alarm is an alarm plug, this alarm plug requires to be connected on different negative electrode interface according to the warning of user, and the negative pole of alarm is connected with the negative pole of rechargeable battery; Described second level vibrations pilot lamp has 3 light emitting diodes, and the positive pole of 3 light emitting diodes is connected on three negative electrodes respectively, and the negative pole of 3 light emitting diodes is all connected with the negative pole of rechargeable battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520574583.9U CN204854948U (en) | 2015-07-31 | 2015-07-31 | Multistage vibrations detector based on electromagnetic induction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520574583.9U CN204854948U (en) | 2015-07-31 | 2015-07-31 | Multistage vibrations detector based on electromagnetic induction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990622A (en) * | 2015-07-31 | 2015-10-21 | 河北工业大学 | Multi-level vibration detector based on electromagnetic induction |
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2015
- 2015-07-31 CN CN201520574583.9U patent/CN204854948U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990622A (en) * | 2015-07-31 | 2015-10-21 | 河北工业大学 | Multi-level vibration detector based on electromagnetic induction |
| CN104990622B (en) * | 2015-07-31 | 2017-09-26 | 河北工业大学 | Multistage vibration detector based on electromagnetic induction |
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Granted publication date: 20151209 Effective date of abandoning: 20170926 |
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