CN100339677C - Displacement detector - Google Patents
Displacement detector Download PDFInfo
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- CN100339677C CN100339677C CNB2005100738261A CN200510073826A CN100339677C CN 100339677 C CN100339677 C CN 100339677C CN B2005100738261 A CNB2005100738261 A CN B2005100738261A CN 200510073826 A CN200510073826 A CN 200510073826A CN 100339677 C CN100339677 C CN 100339677C
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Abstract
This invention provides a displacement detector capable of precisely detecting displacement at a low cost. A driving signal for driving a differential transformer 2 is fed back as a reference signal via an amplifier 11 and an AC/DC converter 12 and regulated by means of an amplitude regulating means 16 so that amplitude of the driving signal value is kept constant. In this way, the stable driving signal can be outputted to the differential transformer 2 by means of a simple structure without requiring any expensive oscillator 6 or amplifier 7, and the stable reference signal is applied to a differential amplifier 10 by processing the driving signal.
Description
The application number that is entitled as " displacement detector and displacement detector " that the application submits to Patent Office of the People's Republic of China on May 31st, 2002 for Omron Corp is dividing an application of 02122152.9 Chinese patent application.
Technical field
The present invention relates to be fit to the displacement pick-up units such as displacement that micrometric measurement for example causes in the size of the parts of factory and assembling part etc., shape or because of pressure, be particularly related to the formation of the noncontact displacement testing circuit that utilizes differential transformer and utilize the structure of the noncontact displacement detecting device of differential transformer.
Background technology
Fig. 8 is the pie graph of the displacement detector of prior art.
1 is the detecting device with differential transformer 2 and sensitivity adjusting resistance 3 in Fig. 8, and differential transformer 2 has unshowned movable core, be configured in two coils 4 and 5 around this movable core.
Two coils, 4,5 coupled in series of this differential transformer 2 are used as from the alternating voltage driving of oscillator by the drive signal of amplifier 7 supplies, provide output signal from its middle tie point.
This displacement detector is the transducer of semibridge system, the inductance value of two coils 4,5 that driven by alternating voltage is functions of movable core position, when the centre position of movable core at two coils 4,5, the induced voltage that causes on two coils 4,5 is equal to each other, when movable core when this centre position is removed, coil 4 or 5 induced voltage increase, and another coil 5 or 4 induced voltage reduce.The contact shoe that contact with determination object such as parts for example is installed on this movable core, can be detected the displacement of this contact shoe, the size and dimension of determination object etc. is carried out in utilization on parts etc.
From the output signal of the intermediate connection point of two coils 4,5 of this differential transformer 2 is interchange output after response movable core displacement amplitude changes, be exaggerated that device 8 amplifies after after 9 full-wave rectifications of AC/DC transducer for the non-inverting input of differential amplifier 10.The alternating voltage that is given differential transformer 2 by amplifier 7 is supplied with the reverse input end of this differential amplifier 10 as reference signal by amplifier 11 and AC/DC transducer 12.
After the output signal of differential amplifier 10 differential amplification reference signals and differential transformer 2, provide and the corresponding output of movable core displacement.
In the example of the prior art, for the detecting device 1 different with measurement range (stroke) is that diverse detecting device is corresponding, and specially sensitivity adjusting resistance 3 is set on one's body in the basis of detecting device 1, gain convert resistance 13 is set, so that according to the gain of the kind switched amplifier 8 of detecting device 1 on the amplifier 8 of the output signal of amplifying differential transformer 2.
In the example of the prior art, pull-down resistor 14 is connected on the output signal line of differential transformer 2 specially, has the comparer 15 that output and limiting proportion from AC/DC transducer 9 are provided broken string output.When the broken strings such as detecting device cable of connection detector 1, for example when detector drive signal A cuts off at least, when perhaps detector output signal line A2 cuts off at least, do not transmit the AC signal of sensor output, become 0V by pull-down resistor 14, can detect broken string by comparer.And when the GND of a detecting device 1 side breaks, because of the detector drive signal not by coil 4, coil 5 dividing potential drops, export same as before and become the detector drive signal, surpass detector-range, can detect the detector drive signals by comparer 15.
In such prior art example, make in order to carry out high-precision dimension measurement etc. small output signal from differential transformer 2 with high SN than output stably, when driving differential transformer 2, must stablize as the output of the amplifier 7 of the reference signal in the differential amplifier 10.Therefore amplifiers such as the oscillator of essential high precision high stability and operational amplifier with under the situation that contains special-purpose IC such as computing circuit that temperature compensation uses, can make the cost increase in order to obtain high SN and high stability.
In addition, detecting device 1 because of sensitivity along with its kind is different, so to every kind of detecting device 1 will be in advance according to the gain of gain convert resistance 13 switched amplifiers, so in the low detecting device 1 of sensitivity, can descend because of the gain SN that rises.In addition, preferably make the reference signal of supplying with differential amplifier 10 have identical characteristic with the disposal system of the output signal of differential transformer 2, but because of the output signal disposal system of differential transformer 2 is constituting by the handoff gain different with the reference signal disposal system, so that the consistent difficulty of the temperature characterisitic of parts, with component configuration difficulty on the good position of thermal equilibrium, this is the main cause that hinders high stableization.
In addition, for according to broken string from the alternating current output signal detection streamer of differential transformer 2 etc., for example in purpose with the sensitivity that improves detecting device 2 etc., when making the high inductance of differential transformer 2, when generations such as the detecting device cable takes place are broken, because the capacitive coupling that produces between the signal wire at the two ends of coil 4 or coil 5 makes the alternating current output signal from differential transformer 2 become unstable, thereby can not detect broken string reliably.Though at this moment in order not to be subjected to capacity coupled the influence, and consider to make the resistance value of pull-down resistor 14 to reduce,, cause the poor linearity of differential transformer again in case the resistance value of pull-down resistor is diminished.There are the problems referred to above when replacing pull-down resistor with pull-up resistor in addition too.
As this displacement detector of prior art, make diameter from for example φ 8 reduce to φ 6 the time, when being installed to displacement transducer mechanically, make to install to become more accurate, can make the more miniaturization of machinery that displacement detector is installed.And because have to make the weight of the movable part of displacement detector to reduce, thus the load of displacement detector can be reduced, thus can use on so far because of the big parts that can not correctly measure of loading.
At the diameter that makes displacement detector when for example φ 8 for example reduces to φ 6, certainly just do not make size reduce to 3/4 (0.75) simply, section reduces to 0.56 times and has just finished the work, also must guarantee to make the intrinsic function and the performances such as twist-lock of the movable part of iron core member action, and must prevent, and must add the movable part of forcing iron core member action and the water resistance between the case side because of the parts miniaturization causes the assembleability variation.
As the displacement detector of prior art, displacement detector for example shown in Figure 24 is arranged.This displacement detector has following formation: the coil housing that wire sleeve 81 and differential transformer 95 are set in housing 80, in housing 80, be provided with and have movable axis 91 and be connected the movable part 101 that is arranged on the iron core member 89 on this movable axis 92 by what wire sleeve 94 can move along the axis direction of housing 80, constitute differential transformer 95 in the coil housing with iron core member 89 insertion differential transformers 95, by be arranged in the housing 80 spring members for example the indeclinable parallel volute spring (not shown) of loop diameter suppress movable part 101 and make the leading section of movable axis 91 outstanding to the outside of housing 80, contact shoe 93 is set on the teat of movable axis 91, wire sleeve 94 has the spherical guide 84 that circumferential part is maintained a plurality of balls 83 and is inserted in the part and has formation in the outer cylinder body 81 of slotted hole 88, by inserting the rotation that locks movable part 101 in the slotted hole 88 of urceolus 81 being arranged on rotation lock rationed marketing 92 on the axle 91.
In addition, the displacement detector as prior art has the detecting device shown in Figure 25 (1).This displacement detector has following formation, the coil housing of wire sleeve 94 and differential transformer 95 is set in housing 80, in housing 80, setting has movable axis 91 and is connected the movable part 101 that is arranged on the iron core member 89 on this movable axis 91 by what wire sleeve 94 can move along the axis direction of housing 80, constitute differential transformer 95 in the coil housing with iron core member 89 insertion differential transformers 95, by be arranged in the housing 80 spring members for example the indeclinable parallel volute spring (not shown) of loop diameter suppress movable part 101 and make the leading section of movable axis 91 outstanding to the outside of housing 80, contact shoe 93 is set on the teat of movable axis 91; On the twist-lock parts 102 that are arranged on the movable axis 91, be arranged on the long slot part 102A of axis direction of housing 80, the pin that metal twist-lock pilot pin 103 is pressed into housing 80 is pressed among the 80a of hole portion, makes this twist-lock pilot pin 103 be inserted in the rotation that locks movable part 101 among the slot part 102A like that shown in Figure 25 (2).
Make cable 96 pass cable inserting hole portion 109 with cable Lock Part 110 like that as shown in figure 26 fixing the and hermetically-sealed construction of cable lead division on housing 80 with resin fill portion 108 and cable inserting hole portion 109, configuration O shape ring 111 between resin fill portion 108 and cable inserting hole portion 109, packing ring epoxy resins 112 in resin fill portion 108 is pressed into cable Lock Part 110 on the rearward end of housing 80.
; displacement detector according to above-mentioned prior art shown in Figure 24; formation as the rotation that locks movable part 101; to be arranged in the slotted hole 88 of outer cylinder body 81 that rotation lock rationed marketing 92 on the movable axis 91 is inserted in wire sleeve 94; therefore must on outer cylinder body 81, form slotted hole 88; form the overlap that produces when slotted hole 88 forms because of on the inner face of the outer cylinder body 81 of ball 83 sliding contacts, existing, and must remove the processing etc. of this overlap.The formation of such wire sleeve, processing is complicated, such movable part rotary locking mechanism makes this work of displacement detector that adapts to more miniaturization have the significantly such problem of decline of assembling operation in the same old way, particularly under the situation of this displacement detector, the length of the movable direction of cause is elongated, the outer cylinder body 81 and differential transformer 95 adjacency of wire sleeve 94, and the magnetic of outer cylinder body 81 has harmful effect to the characteristic of differential transformer 95, thereby has unstable properties, the unstable such problem of temperature characterisitic.
Shown in Figure 25 in addition, formation as 101 rotations of locking movable part, though the formation in the slot part 102 that makes the metal twist-lock directing pin that is arranged in the housing 80 be inserted in twist-lock parts 102 is arranged, but at this moment, when movable part 101 motions, twist-lock directing pin 103 is slided in slot part 120A, produce friction between the metal, sliding resistance is increased, thereby the difficult problem that exists operating physical force to reduce, particularly because of the portion that is pressed into 80 of rotation lock rationed marketing 103 is arranged in housing 80, and can not guarantee water resistance, being pressed at the pin of housing 80 needs certain wall thickness among the 80a of hole portion and makes the minor diameter difficulty, and the processing cost of the long housing 80 of the length of movable direction can increase.
Because on the back-moving spring of movable axis 91, use the indeclinable volute spring of loop diameter (parallel spring), so when the detecting device miniaturization, because of volute spring and parts interference on every side produce friction, make displacement detector miniaturization and operating physical force savingization become difficulty simultaneously.
In addition, because when being fixed on the lead division of cable on the housing 80, by cable 89 being passed the cable inserting hole portion 109 of cable Lock Part 110, configuration O shape ring 111 between resin fill portion 108 and cable inserting hole 109, packing ring epoxy resins in resin fill portion 108, then cable Lock Part 110 is pressed into the rearward end of housing 80, so it is big that the deviation of intensity becomes, make the flexibility (cable flexibility) of guaranteeing the cable lead division become difficulty, make position detector miniaturization and tensile strength become big both double depositing and become difficulty.
In addition, as other displacement detector of the prior art displacement detector shown in Figure 27 is arranged, under the situation of this displacement detector, on housing 80-1, form female screw portion 120, on the outer cylinder body 81-1 of wire sleeve 94-1, form outer screw section 121,, carry out waterproof by clamping flat liner by this pin thread 121 is screwed under the situation in the female screw portion 120, but the threaded top of outer screw section 121 must have certain height, thereby makes the displacement detector miniaturization become difficulty.Though the formation of not leaning on the fitting piece combination of screw thread combination is also arranged in addition, at this moment has the problem of guaranteeing stable sealing difficulty.
In addition, displacement detector shown in Figure 28 is arranged, under the situation of this displacement detector, when assembling, gum sleeve 123 is embedded on the movable axis 125 from measuring sub 124 sides as the another displacement detector of prior art.Because be combined in the outer screw section of measuring on the son 124 126 being provided for spiral on the movable axis 125, so the inner face (sealing surface) of sealing 123 that has rubber blanket 123 is guaranteed stable sealing difficulty by the problem of outer screw section 126 sliding injuries thereby make.
Summary of the invention
The present invention is conceived to the problems referred to above and proposes, its objective is to solve above-mentioned the problems of the prior art, and provide and can the high Precision Detection displacement not only can detect the low-cost displacement detector of broken string and can guarantee original function and but also displacement detector that must miniaturization.
According to displacement detector of the present invention, have following formation for achieving the above object:
That is to say that displacement detecting apparatus of the present invention has: to differential transformer supply with drive signal driver element, handle above-mentioned drive signal as the reference signal processing unit of reference signal output, handle from the output signal processing unit of the output signal of differential transformer, differential amplification differential motion amplifying unit from the output signal of the reference signal of said reference signal processing unit and above-mentioned output signal processing unit; Also has the amplitude adjustment unit that a reference signal from the said reference signal processing unit feeds back to above-mentioned driver element and the amplitude of above-mentioned drive signal is adjusted into certain value.
According to displacement detecting apparatus of the present invention, because have the amplitude adjustment unit that a reference signal from the said reference signal processing apparatus feeds back to above-mentioned drive unit and the amplitude of drive signal adjusted to certain value, so can handle as open loop is the prior art example, do not need amplifiers such as the oscillator of accurate and high stable and operational amplifier, just can obtain stable drive signal drives differential transformer specially with simple circuit formation, and can supply with stable reference signal to differential motion amplifying unit.
According in another embodiment of the present invention, supply with above-mentioned amplitude adjustment unit according to the reference value of differential transformer kind, this amplitude adjustment apparatus is adjusted to the above-mentioned certain value corresponding with the said reference value with amplitude.
According to displacement detecting apparatus of the present invention, because according to the differential transformer kind, promptly drive the amplitude of the drive signal of differential transformer according to the sensitivity adjustment of differential transformer, do not make SN than descending so do not resemble the prior art example of handoff gain.And because be not the formation that resembles handoff gain the prior art example,, can make the temperature characterisitic unanimity of parts, and make component configuration on thermal equilibrium position well so reference signal processing unit and output signal processing unit can carry out same processing.
In an embodiment of displacement detecting apparatus of the present invention, replacing supplying with above-mentioned differential multiplying arrangement from the reference signal of said reference signal processing unit from the said reference value of above-mentioned amplitude adjustment unit, this reference value of differential amplification and from the output signal of above-mentioned output signal processing unit.
According to displacement detecting apparatus of the present invention, because the amplitude that above-mentioned amplitude adjustment unit is adjusted drive signal according to the reference signal and the reference value of feedback, so that it becomes the amplitude corresponding with the said reference value, institute is so that reference signal and reference value about equally, also can produce same action effect even replace reference signal to supply with differential motion amplifying unit to reference value.
In the another embodiment of displacement detecting apparatus of the present invention, the said reference signal processing unit has amplifying circuit that amplifies the above-mentioned drive signal that exchanges and the translation circuit that the output of this amplifying circuit is become direct current; Above-mentioned output signal processing unit has amplification and becomes DC transfer circuit from the amplifying circuit of the output signal of differential transformer with output transform this amplifying circuit; At least make at least one side's thermal coupling of above-mentioned two amplifying circuits and above-mentioned two translation circuits.
At this, so-called thermal coupling is meant the thermal coupling that for example encapsulates sharing and realize by configuration of components.
According to displacement detecting apparatus of the present invention, because make the reference signal feedback, so temperature drift in the special revisal reference signal processing unit automatically, because make reference signal processing unit and the output means thermal coupling of carrying out so-called amplification and conversion same treatment, so that the temperature drifts in two processing units etc. are identical, its drift part offsets in the differential motion amplifying unit of back level, thereby can detect displacement accurately.
In another embodiment of displacement detecting apparatus of the present invention, the drive signal of above-mentioned driver element output stack Dc bias, and have according to the unusual detecting unit of the detection of the DC biased level on the output signal that is superimposed upon above-mentioned differential transformer.
According to displacement detecting apparatus of the present invention, because detect unusual according to the DC biased level that is superimposed upon on the differential transformer output signal, so when broken strings such as detecting device cable, the DC biased level that is superimposed upon on the output signal of differential transformer departs from the scope of regulation, thereby can detect broken string.Even and when making the broken string of the high inductance situation of differential transformer, can not be subjected to capacity coupled the influence yet, and can detect broken string really, there is no need to make pull-down resistor or pull-up resistor to reduce.And be driver element when breaking down, because the DC biased level that is superimposed upon on the output signal of differential transformer departs from the scope of regulation, so still can detect this fault.
In order to achieve the above object, displacement detector of the present invention has following formation: the wire sleeve that the movable part support that has outer cylinder body and can move along the axis direction of this outer cylinder body is set in housing, and be provided with by above-mentioned wire sleeve the movable axis with the iron core member that keeps differential transformer can be set movably along the axis direction of above-mentioned housing, front at above-mentioned movable axis is provided with contact shoe, outwards suppress above-mentioned movable part by the back-moving spring spring members, and utilize the rotary locking mechanism of movable part to lock the rotation of above-mentioned movable part; This detecting device also has following formation: on the above-mentioned outer cylinder body of above-mentioned wire sleeve and above-mentioned movable part support twist-lock hole portion is set respectively, the insertion fitting portion that inserts the twist-lock parts is set on above-mentioned movable axis, make these twist-lock parts can insert above-mentioned insertion fitting portion movably, constitute above-mentioned movable part rotary locking mechanism whereby along the moving direction of above-mentioned movable part.
At this, the outer cylinder body of so-called wire sleeve is to be equivalent to the cylindrical shell that contacts with inner face in this housing when for example the chimeric contact of wire sleeve is on housing, so-called movable part support is equivalent to for example keep the spherical guide of a plurality of balls, and twist-lock is equivalent to urceolus side twist-lock hole portion and spherical guide side twist-lock hole portion with the hole.And so-called twist-lock parts are equivalent to the rotation lock rationed marketing, and the so-called fitting portion that inserts is equivalent to pin embedded hole portion.
According to the formation of this displacement detector, can make to be contained in the displacement detector body interior in the movable part rotary locking mechanism, can suppress radial play, make the displacement detector pathization.And body is shortened, can also guarantee the intensity of movable axis, make the handling ease of movable axis.
In the displacement detector of above-mentioned displacement detector of the present invention, the twist-lock separately of above-mentioned outer cylinder body and above-mentioned movable part support is along the long rectangle of the moving direction of above-mentioned movable part with hole portion.
According to the formation of this displacement detector,, and moving of movable part successfully carried out because of the twist-lock parts can not block twist-lock hole portion.
In above-mentioned displacement detector of the present invention, seal the twist-lock hole portion of outer cylinder body with heat-shrinkable tube.
The rotation that what is called is sealed outer cylinder body with heat-shrinkable tube is meant with hole portion, coats the pipe of heat-shrinkable film of synthetic resin on the pipe installation portion that is provided with on the peripheral part of outer cylinder body, seals twist-lock hole portion by making this pipe thermal shrinkage.
According to the formation of this displacement detector, can prevent the wire sleeve is entrenched in the housing back with bonding agent when bonding bonding agent enter in the twist-lock usefulness hole.
Displacement detector of the present invention has following formation: the protuberance of going into to pleurapophysis wherein is set in above-mentioned housing, forms the par on this protuberance, form the docking section of direction of the axis quadrature of this and above-mentioned housing on the par; In above-mentioned housing, rotation-preventing member is set, the docking section of the direction of the axis quadrature of formation and above-mentioned housing on the external of this rotation-preventing member; On above-mentioned par, make raised part location and make above-mentioned docking section carry out above-mentioned rotation and prevent that the location of portion and rotation from preventing fetching mutually.
Formation according to this displacement detector, can be under the state that twist-lock is inserted in parts in the housing, make after making protuberance be positioned on the par portion is docked mutually, again the twist-lock parts are fixed on the housing, stop thereby in the location of carrying out rotatable parts, realizing rotating.
And, form raised part by the above-mentioned housing of punch process, by the peripheral part of the above-mentioned housing of centerless grinder grinding grinding, make the thickness of shell attenuation, thereby guarantee that the outstanding size of raised part reaches the size of regulation.
According to the formation of this displacement detector, even on the housing of thin thickness, also can guarantee the size that size reaches regulation of charging into of protuberance, and can make the thickness attenuation of housing, thereby can help the minor diameterization of displacement detector.
In addition, displacement detector of the present invention is an additional following formation in above-mentioned displacement detector of the present invention:
In above-mentioned case side above-mentioned first, second fixation side stopper portions is set, first, second movable side stopper portions is set on above-mentioned movable part; Hold the state in gap under at above-mentioned rotation stop member and above-mentioned twist-lock between the leading section with hole portion in the stretching gauge that makes the above-mentioned movable part that produces by above-mentioned back-moving spring, make the above-mentioned first movable limit block portion dock formation with the above-mentioned first fixed stop portion, in that the gauge that is pressed into that is pressed into by above-mentioned movable part is held under the state in gap between the rearward end with hole portion at above-mentioned twist-lock parts and above-mentioned rotation, make the above-mentioned second movable side stopper portions dock formation with the above-mentioned second fixation side stopper portions.
And preferably, the first fixation side stopper portions is set on the above-mentioned outer cylinder body of above-mentioned wire sleeve, the above-mentioned second fixed stop portion is set on above-mentioned rotation-preventing member, on above-mentioned movable axis, iron mandrel is set, above-mentioned first, second movable limit block portion is set in this iron mandrel.
Formation according to this displacement detector, even because head into going up separately of the limit in the limit of stretch of the movable part that produces by the Flexible Reset parts with by what heading into of movable part caused, rotatable parts do not dock with the end (end, front and back) of hole portion with twist-lock yet, so can prevent the distortion of rotatable parts, and because the twist-lock parts are indeformable, so can make the iron core position bias free on differential transformer.
In addition, displacement detector of the present invention is in above-mentioned displacement detector of the present invention, additional following formation: on above-mentioned iron mandrel and above-mentioned rotation-preventing member, spring-loaded portion is set respectively, make above-mentioned back-moving spring parts between these two spring-loaded portions, constitute this back-moving spring by conical helical spring, the tapered portion that prevents that above-mentioned two conical helical springs from disturbing is set in this iron mandrel.
According to this formation of displacement detector, even because the displacement detector miniaturization, this conical helical spring also seldom disturbs with parts on every side, thus can reduce the operating physical force of movable part, and help the miniaturization of displacement detector.
In addition, displacement detector of the present invention is an additional following formation in above-mentioned displacement detector of the present invention: above-mentioned movable axis and the sub-holding member of mensuration that keeps said determination as other parts, end cap with the chimeric maintaining part of rear side sleeve pipe is set on the above-mentioned urceolus of above-mentioned wire sleeve, sleeve pipe chimeric maintaining part in front side is set on the sub-keeper of said determination, be installed on the gum sleeve by the front side portion of above-mentioned gum sleeve being entrenched on the chimeric maintaining part of above-mentioned front side sleeve pipe and the sub-holding member of said determination, the sub-holding member of said determination is combined on the above-mentioned movable axis front end, the rear lateral portion of above-mentioned gum sleeve is entrenched on the chimeric maintaining part of above-mentioned rear side sleeve pipe.
According to the formation of this displacement detector, can prevent the internal injury of gum sleeve, and because by the magnitude of interference that end cap can be guaranteed rubber heat is set on the outer cylinder body of wire sleeve, thereby can guarantee stable water resistance.
In addition, displacement detector of the present invention is in above-mentioned displacement detector of the present invention, additional following formation: the peripheral part at above-mentioned end opening is provided with the chimeric slot part of using of waterproof ring, at the chimeric slot part of above-mentioned waterproof ring waterproof ring is set, in that the above-mentioned outer cylinder body of above-mentioned wire sleeve is chimeric when being fixed on the above-mentioned housing, make above-mentioned waterproof ring contact on the inner peripheral surface of upper shell.
Formation according to this displacement detector can be guaranteed stable water resistance.
In addition, displacement detector of the present invention is in above-mentioned displacement detector of the present invention, additional following formation: on cable,, draw so that above-mentioned cable lead division is entrenched on the rear end side of above-mentioned housing and from the rear end side of above-mentioned housing with the integrally formed cable lead division of synthetic resin.
At this, so-called is to adopt and polyester elastomer that cable is same is integrally formed in the cable lead division with the integrally formed cable lead division of synthetic resin on the cable of the coil sides that is connected above-mentioned differential transformer.
According to the formation of this displacement detector, because the parts that the cable maintaining part need not be other so can reduce part count, can reduce cost, and can obtain firm and stable cable and draw precision, cable warp resistance performance is improved.
In addition, displacement detector of the present invention is in above-mentioned displacement detector of the present invention, has following formation: at the peripheral part of above-mentioned cable lead division bonding agent is set and accumulates and use slot part, use jut at this bonding agent with forming in the slot part to seal simultaneously, accumulate with slot part filling bonding agent at above-mentioned bonding agent, in that above-mentioned cable lead division is chimeric when being fixed on the upper shell, above-mentioned sealing is contacted with the inner peripheral surface of above-mentioned housing with jut, and above-mentioned bonding agent is encapsulated in above-mentioned bonding agent and accumulates with on the slot part.
According to the formation of this displacement detector, can guarantee stable water resistance.
Description of drawings
Fig. 1 is the pie graph of displacement detector one embodiment of the present invention.
Fig. 2 is the pie graph of another embodiment of displacement detector of the present invention.
Fig. 3 is the pie graph of the another embodiment of displacement detector of the present invention.
Fig. 4 is the pie graph of another embodiment of displacement detector of the present invention.
Fig. 5 is the circuit diagram of the AC/DC transducer major part of Fig. 4.
Fig. 6 is the figure that is used to illustrate the operational amplifier of thermal coupling.
Fig. 7 is the figure that is used to illustrate the diode array of thermal coupling.
Fig. 8 is the pie graph of prior art example displacement detector.
Fig. 9 is the decomposing state skeleton view of displacement detector of the present invention.
Figure 10 is the longitudinal diagram of this displacement detector.
Figure 11 is the sectional view of the previous section of this displacement detector.
Figure 12 is the sectional view of this displacement detector center section.
Figure 13 is the outboard profile of the iron mandrel of this displacement detector.
Figure 14 is the sectional view of the aft section of this displacement detector.
Figure 15 is the oblique view of decomposing state of the movable part rotation lock mechanism of this displacement detector.
Figure 16 is the skeleton view that is used to illustrate the gum sleeve assembling of this displacement detector.
Figure 17 is the sectional view of the housing turn lock part of this displacement detector.
Figure 18 is the sectional view as the housing turn lock part of prior art.
Figure 19 is the planimetric map of the turn lock part of displacement detector of the present invention.
Figure 20 (1) is a planimetric map of using hole portion as the twist-lock of prior art.
Figure 20 (2) is a planimetric map of using hole portion as another routine twist-lock of prior art.
Figure 21 is the sectional view of assembling that is used for the gum sleeve sealing of displacement detector of the present invention.
Figure 22 is the key diagram as the gum sleeve sealing assembling of prior art.
Figure 23 (1) is the key diagram of limit of stretch of the movable part of displacement detector of the present invention.
Figure 23 (2) is the key diagram that is pressed into the limit of the movable part of displacement detector of the present invention.
Figure 24 is the decomposing state skeleton view of the displacement detector of prior art.
Figure 25 (1) is the decomposing state skeleton view of another displacement detector of prior art.
Figure 25 (2) is the longitudinal diagram of this displacement detector.
Figure 26 is the sectional view of the displacement detector cable section hermetically-sealed construction of prior art.
Figure 27 is the skeleton view of hermetically-sealed construction of the bound fraction of the housing of displacement detector of prior art and wire sleeve.
Figure 28 is the oblique view of gum sleeve assembling that is used to illustrate the displacement detector of prior art.
Embodiment
Below the embodiment that present invention will be described in detail with reference to the accompanying
Fig. 1 is the pie graph of displacement detector 17 of the displacement detector embodiment of an embodiment of the present invention, uses same reference number in the part of the above-mentioned prior art example of correspondence.
Detecting device 1 is to link to each other with displacement detecting position 17 by the detecting device cable, and is the same with the example of prior art, has differential transformer 2 and sensitivity adjustment resistance 3.Differential transformer 2 has unshowned movable core and is configured in this movable core two coils 4,5 on every side.
Two coils 4,5 of differential transformer are connected in series, and are used as the drive signal alternating voltage driving that oscillator is supplied with by amplifier 7.In the present embodiment, constitute the driver element that drives differential transformer 2 by oscillator 6 and amplifier 7.
From the signal of the intermediate connection point output of two coils 4,5 of differential transformer is the interchange output that changes according to the movable core displacement amplitude, supplies with non-inverting input by transducer 9 full-wave rectifications supply differential amplifier 10 amplifying the back through amplifier 8.In the present embodiment, constitute the output signal processing unit of the output signal of handling differential transformer 2 by amplifier 8 and AC/DC transducer 9.
Supply with the alternating voltage of differential transformer 2 from differential amplifier 7 and supply with the reverse input end of differential amplifier 10 as reference signal by amplifier 11AC/DC transducer 12, in the present embodiment, constitute by handle the reference signal processing unit of drive signal by amplifier 11AC/DC transducer 12 as reference signal output.
In the present embodiment, in order the detecting device 1 different to be diverse detecting device 1 with measurement range (stroke), and sensitivity adjusting resistance 3 is set specially on one's body 1 of detecting device, gain convert resistance 13 is set, with gain according to the kind switched amplifier of detecting device 1 on the amplifier 8 of the output signal of amplifying differential transformer 2.
In the present embodiment, link to each other specially at the output signal line of pull-down resistor 14 with differential transformer 14, and have comparer 15, this comparer 15 will be confessed broken string output after relatively from the output of AC/DC transducer 9 and gauge.
More than constitute identical with above-mentioned prior art example.
In the present embodiment, for expensive oscillator 6 that need not be special-purpose and amplifier 7 or special-purpose IC etc. also can carry out high-precision displacement detecting, and has amplitude adjustment unit 16, this amplitude adjustment unit drives differential amplifier and highly stable and by the reference signal from the AC/DC transducer 12 that constitutes the reference signal processing unit is fed back to driver element, the amplitude that drives the alternating voltage of differential transformer 2 is adjusted to certain value as the output of the amplifier 7 of the reference signal of amplifier 10 in order to make.
This amplitude adjustment unit 16 has reference value in inside, and has amplitude adjusting circuit, and this amplitude adjusting circuit is adjusted amplitude from the alternating voltage of oscillator 6 for reference signal from AC/DC transducer 12 is become to this reference value.
Like this, because pass through FEEDBACK CONTROL, make the amplitude of the drive signal of supplying with differential transformer remain certain value, can drive differential transformer specially by stable signal, also make reference signal stable by handling this drive signal supply differential amplifier, thereby do not need as carrying out the prior art that open loop is handled, with precision and amplifiers such as the oscillator of high stable and operational amplifiers, the low cost of carrying out and the displacement detecting of high stability.
Adjust on the electronic reference value owing to also only be summarised in amplitude, and temperature compensation need not be set with computing circuit etc., and can realize high stableization with the influence of temperature change.
Fig. 2 is the pie graph of the displacement detector 17a of another embodiment of the present invention, and the corresponding part of all and above-mentioned embodiment is with identical reference marks.
In the above-described embodiment, same as the prior art, according to the kind of detecting device 1, and by gain convert resistance 13, it is corresponding to change Amplifier Gain, in this embodiment, according to the kind of detecting device 1A, switches the reference voltage of adjusting amplitude means 16a.
That is to say, in the present embodiment, detecting device 1a is except that having differential transformer 2, also has sensitivity adjusting resistance 3a, the voltage of this sensitivity adjusting resistance 3a and resistance 18 dividing potential drops is supplied with amplitude adjustment unit 16a as reference voltage, amplitude adjustment unit 16a by operational amplifier 19 with reference voltage with compare from the reference signal of AC/DC transducer 12, adjust the amplitude of drive signals by amplitude adjusting circuit 20, so that said reference voltage becomes zero with difference from the reference signal of AC/DC transducer 12.
According to present embodiment, because the kind according to detecting device 1a is the amplitude that the drive signal of differential transformer is supplied with in detecting device 1a sensitivity adjustment, so compare with the formation of the gain 8 of switched amplifier, even little to the variation of SN ratio, the low detecting device of sensitivity also can be guaranteed high SN ratio.
In addition, because do not setover convert resistance 13, become identical by the processing in amplifier 8 and the output signal processing unit that AC/DC transducer 9 is formed with processing in the reference signal processing unit of forming by amplifier 11 and AC/DC transducer 12 and make, thereby make the temperature characterisitic unanimity of parts, or adopt thermally equilibrated component configuration, in addition by carrying out following thermal coupling, can in differential amplifier 10, offset because of the drift in two processing units is identical, detect thereby can carry out high precision displacement.In addition, sensitivity adjusting resistance 3 and dividing potential drop also can be arranged on connector and the position detecting device 17a that is used for connection detector with resistance 18 etc.
Other formation is identical with above-mentioned embodiment with effect.
As mentioned above, because amplitude adjustment unit 16a adjusts the amplitude of drive signal so that reference signal becomes zero with difference from the reference signal of AC/DC transducer 12,, reference voltage equates so becoming with reference signal from AC/DC transducer 12.
At this,, as shown in Figure 3, can the reference signal from AC/DC transducer 12 not inputed to differential amplifier 10 yet, but reference voltage is inputed to differential amplifier 10 as other embodiment.In addition, in the embodiment of Fig. 1, can the reference signal from AC/DC transducer 12 not inputed to differential amplifier 10 equally yet, and the reference voltages in the amplitude adjustment unit 16 of Fig. 1 are inputed to differential amplifier.
Fig. 4 is the pie graph of the displacement detector 17b of another embodiment of the present invention, corresponding partly with identical reference marks with above-mentioned embodiment.
In each above-mentioned embodiment, identical with the prior art example, according to the result who the broken string of detecting device cable etc. is detected from the alternating current output signal of differential transformer 2, in the present embodiment, be superimposed upon Dc bias on the alternating voltage of the oscillator 6 that becomes drive signal specially by direct current biasing supercircuit 21, by low-pass filter 22 dc offset voltage on the output point that is superimposed upon the differential transformer 2 that provides from amplifier 8 is separated, level according to this direct current biasing, with the broken string that detects detecting device cable etc. by comparer 15a or the fault of driver element, the detecting unit of abnormality detection is made of low-pass filter 22 and comparer 15a in the present embodiment.
According to present embodiment, in case the detecting device cable break, then because be superimposed upon the scope of the level overshoot of the direct current biasing on the output signal of differential transformer 2, so can detect electric wire by comparer 15a.That is to say that when detector drive data side A1 at least cut off, perhaps when detector output signal A2 cuts off, the detecting device that is superimposed with DC level was exported and do not transmitted, and becomes 0V by pull-down resistor 14, thereby can detect broken string by comparer 15.In addition, when only the GND side A3 of detecting device broke, because detect drive signal not by coil 4, coil 5 dividing potential drops, so the detector drive signal is exported by its former state, dc offset voltage surpassed the level of stipulating, this can be detected by comparer 15a.
In the present embodiment, when driver element has fault, owing to be superimposed upon the scope of the level overshoot of the direct current biasing on the output signal of differential transformer 2, and also can detect this fault.
Because carry out FEEDBACK CONTROL equally with the respective embodiments described above, so when unusual back its output of driver element generation changes, owing to controlling in order to compensate this change, so though the unusual detection of driver element is difficult, but in the present embodiment, because monitor the DC biased level of stack by driver element, this is unusual so also can go out as fault detect.
In addition, in the prior art example, under the situation that makes differential transformer 2 high inductanceization, when broken strings such as detecting device cable, make alternating current output signal become unstable owing between the signal wire at the two ends of coil of representing with imaginary line 4 or coil 5, producing coupling capacitance C from differential transformer 2, thereby can not detect broken string reliably, but in the present embodiment, because detect broken string according to DC biased level, so can not be subjected to this coupling capacitance to detect broken string reliably with influencing, do not need to make the pull-down resistor value to reduce, can not make the poor linearity of differential transformer 2 yet.
Under with the situation that promotes resistance replacement pull-down resistor, be suitable for too in addition.
In addition, in the present embodiment, identical with above-mentioned embodiment 2, make the temperature characterisitic of the output signal processing unit that amplifier 8 and AC/DC transducer form and the element of the reference signal processing unit of forming by amplifier 11 and AC/DC transducer 12 consistent or adopt thermally equilibrated arrangements of components, make the drift in these two processing units identical by carrying out thermal coupling in addition, in differential amplifier 10, they are offseted.
The following describes thermal coupling.Fig. 5 is the circuit diagram of detailed formation of representing to constitute respectively the AC/ DC transducer 12,9 of reference signal processing unit and output signal processing unit.
The AC/DC transducer 12 of reference signal processing unit also has two two utmost point ripples 25,26 that rectification is used except that having two operational amplifiers 23,24.The AC/DC transducer 9 of output signal processing unit except that having two operational amplifiers 27,28, also has rectification diode 29,30 equally.
In the present embodiment, constitute above-mentioned amplifier 23,24,27,28 by four operational amplifiers 31 of putting into shown in Figure 6, and constitute two diodes 25,29 respectively with diode array shown in Figure 7 32; 26,30.That is to say, realize hot couplingization by making the encapsulation sharing.
Other formation is identical with above-mentioned embodiment with effect.
In the above-described embodiment, show the formation of thermal coupling AC/ DC transducer 9,12, can certainly make amplifier 8,11 thermal couplings.
In the above-described embodiment, the size and dimension that is suitable for determination objects such as components of assays etc. has been described, the present invention is also applicable to the purposes of pressing by the displacement detecting that detects diaphragm etc. certainly.
According to above-mentioned displacement detector of the present invention, because pass through FEEDBACK CONTROL, make the amplitude of the drive signal that drives differential transformer be controlled to certain value, so do not need to resemble the prior art example of open loop handling like that with amplifiers such as accurate and expensive oscillator and operational amplifiers, constitute the stable drive signal of acquisition by simple circuit and just can drive differential transformer, can carry out high-precision displacement detecting to constitute cheaply.
Fig. 9 is the oblique view of the decomposing state of displacement detector of the present invention, Figure 10 is the longitudinal diagram of this displacement detector, Figure 11 is the sectional view of the previous section of this displacement detector, Figure 12 is the sectional view of displacement detector center section, Figure 13 is the outboard profile of the iron mandrel of this displacement detector, and Figure 14 is the sectional view of the rear section of this displacement detector.
Have by the tubular shell 1 of stainless steel, along the circumferential direction form a plurality of pars intermedia of cylinder and shell-side turn lock parts of giving prominence to the central side of housing 12 of being located at the interval of stipulating on the face of cylinder of this housing 1 at displacement detector of the present invention (embodiment), these case side turn lock parts are by constituting to the outstanding protuberance 3 of the central side of housing 1 as shown in Figure 17.
The formation of these protuberances 3 goes into protuberance 3 by utilizing drift and punch die (all not shown among the figure) punch process as shown in Figure 18 to the middle pleurapophysis of housing 1, protuberance 3 charge into size X, when the thickness of establishing housing 1 is t, as not satisfying
X＜t/2，
Then can on housing 1, crack C.
Therefore, as shown in Figure 17, by on the housing thicker 1, carrying out punch process than t, formation is charged into after the protuberance 3 of size X, peripheral part by centerless grinder grinding grinding housing 1 makes the thickness of housing 1 become t, and that guarantees these protuberances 3 whereby charges into size X.At this moment can eliminate the recess 3-1 of the peripheral part of housing 1 by the centerless grinder grinding, thereby can make the goodlooking of displacement detector, and make the front face of protuberance 3 be processed into docking section 3A.
So as Figure 10 and shown in Figure 14 being integrally formed on the chimeric rearward end that is fixed on housing 1 of cable lead division 74 on the cable 46.That is to say, on cable lead division 74, adopt polyester elastomer, on the integrally formed cable 46.At this moment form along the circumferential direction at the peripheral part of cable lead division 74 that bonding agent accumulates with slot part 76, accumulate with along the circumferential direction forming sealing on the bottom of groove 76 with lug boss 77 at this bonding agent.
In addition, as shown in Figure 10, anterior until the rear portion order is provided with coil case 6A (coil former assembly), cable liner 42 and the coil former support spring 44 of wire sleeve 4, rotation-preventing member (block) 5, differential transformer 6 in housing 1 from it.
Above-mentioned wire sleeve 4, as Figure 10 and shown in Figure 15, having the maintenance of accommodating in outer cylinder body 7, to make the movable part support of the tubular that a plurality of balls 8 rotate be the formation of spherical guide 9.So outer cylinder body 7 has the hardware body 7A of tubular, form a cylindrical section installation portion 10 lower than other parts at the pars intermedia of the peripheral part of this hardware body 7A.Make central portion that is positioned at cylinder installation portion 10 and the twist-lock usefulness hole 11, urceolus side of using hole portion as twist-lock so on hardware body 7A, form.
This urceolus side twist-lock is rectangles at the axis direction イ of outer cylinder body 7 with hole portion 11 as shown in Figure 19, urceolus side twist-lock meets at right angles with the relative axis direction イ of forward and backward end 11a, 11b of hole portion 11, and urceolus side twist-lock is diminished with the radius R of four corner parts of hole portion.
Rotating forward and backward end with hole portion 11 when the urceolus side is semicircle or when being half elliptic like that shown in Figure 20 (2) like that shown in Figure 20 (1), be stuck in the front and back end such improper part of urceolus side twist-lock though exist rotation lock rationed marketing 51 described later to nip, can eliminate this improper part with hole portion 11.
On the rear portion of the interior perimembranous of outer cylinder body 7, the urceolus side block 7B that the first fixation side stopper portions is a ring-type is set in addition.And end cap 12 forms embeded slot 13 by being pressed on the front side that is fixed on outer cylinder body 7 on this end cap 12, and forms the chimeric maintaining part 14 of rear side sleeve pipe in the front side of end cap 12.
As rotating with hole portion 15 with the spherical guide side of hole portion with the corresponding twist-lock of hole portion 11 with the urceolus side twist-lock of urceolus 7, this spherical guide locking has identical formation with urceolus side twist-lock with hole portion 11 with hole 15 when being formed on assembling wire sleeve 4 in addition on spherical guide 9.
In addition, rotation-preventing member 5 is as Figure 10 and have cartridge body 5A as shown in Figure 12, on the rear portion of this hardware body 5A, form diameter the be pressed into portion 16 littler than hardware body 5A, hardware body 5A forms spring-loaded portion 18 with the inner face side that is pressed into the transition part 17 of portion 16, and it is stopper portions 18A that the first fixation side stopper portions is set in this spring-loaded portion 18.On the peripheral part of hardware body 5A, be positioned at its rear portion and predetermined distance spaced apart in the circumferential direction and form a plurality of smooth facial 19.Form the docking section 20 of erecting the wall shape, component parts side turn lock part 21 at these smooth front ends of facial 19.
So under the state that rotation-preventing member 5 inserts in the housing 1, the protuberance 3 of case side turn lock part 2 is positioned on the par 19 of component side turn lock part 21, docking section 3A, 20 butt joints mutually when the position of rotation-preventing member 5 is determined, can prevent its rotation.
The coil sides 6A of differential transformer 6 has coil former 24, front side sleeve pipe fitting portion 25 is entrenched on the front of this coil former 24, on rear end side, form back side seal fitting portion 26 and diameter and bump the portion of connecing 27, bump 28 2 of the winding wire leading-out portions of formation groove shape in the portion of connecing 27 at this rear side sleeve pipe fitting portion 26 and housing than its rear side sleeve pipe fitting portion 26 big housings.Spacer portion 29 is set, and setting is across first, second coil 30,31 of the mutual line in front and back of the spacer portion 29 of coil former 24 on the pars intermedia of coil former 24.
The bobbin 33 of heat-shrinkable film of synthetic resin (for example Kapton) system is enclosed within on the seal member 32 in addition.And rearward give prominence on the rearward end of coil former 24 with first, second, third terminal pins 38,39,40 that the wire connecting portion of first, second coil 30,31 is connected with the terminal at coil-end end (all not shown).
Like this, on coil former 24, set first, second coil 30,31, on coil former 24, put tubular seal member 32, so that encase the 1st, the 2nd coil 30,31, in addition, on seal member 32, put the bobbin 33 of heat-shrinkable film of synthetic resin system, constitute the coil housing 6A of differential transformer 6, coil housing 6A at the differential transformer 6 that constitutes like this takes under the state that is fixed in the housing, can guarantee the coil housing 6A and housing 1 alignment of this differential transformer 6.
Then, take under the state that is fixed in the housing at the coil housing 6A of differential transformer 6, the portion that is pressed into 16 of rotation-preventing member is pressed in the front seal fitting portion 25 of coil former 24, the leading section of cable liner 42 is docked on the back of housing contact site 41 of rearward end of coil former 24, the coil former of packing under compressive state between the spring-loaded portion 43 of the leading section of the rearward end cable lead division 74 of this cable liner 42 is supported spring, and this coil former supports the elastic force of spring 44 by cable liner 42 coil former 4 to be pressed against on the rotation-preventing member 5.
Therefore, the size of the internal part (rotation-preventing member 5, coil former 24, cable liner 42) that causes because of temperature variation is flexible is supported spring 44 to absorb by coil former, do not have the gap between the internal part thereby make,, but still repeatable accuracy is improved though therefore temperature coefficient increases.
So, be connected on the cable 46 at first, second coil 30,31 that sets on the coil former 24 and seal member 32 wiring graph by flexible base, board 45.So flexible base, board 45 is positioned in the cable liner 42.
Have in addition as the conical helical spring 48 of back-moving spring and the movable part 50 of iron core member 53 and be inserted in the housing 1.That is to say that this movable part 50 is as Figure 10 and have movable axis 51 as shown in Figure 12, iron core member 53 is installed by the iron mandrel 52 that combines with the rearward end screw thread of this movable axis 51 on the rear portion of iron mandrel 52.
On the leading section of movable axis 51, form outer screw section 60, on the rear end, form female screw portion 78, in fitting portion is inserted in the pars intermedia formation conduct of movable axis 51 along radial direction pin embedded hole portion 79.
In addition, measure sub-holding member 61 and as shown in Figure 16, on hardware body 61A, rearward form and measure son and threaded portion 62 is installed, measures that son is fixing to be constituted with threaded portion 65 with stopper portions 63, the chimeric maintaining part 64 of front side sleeve pipe and combination to its front side as Figure 10.
The assembling of wire sleeve 4 is carried out as follows: accommodate in outer cylinder body 7 and can rotate the spherical guide 9 that remains on a plurality of balls 8 of circumferential part, to be entrenched in the pin embedded hole portion 79 of movable axis 51 as the rotation lock rationed marketing 51A insertion of twist-lock parts with hole portion 15 by spherical guide side twist-lock with hole portion 11 sides to the outer cylinder body twist-lock, the coil former pipe 10A of heat-shrinkable film of synthetic resin system is enclosed within on the pipe installation portion 10 of urceolus 7, by making its thermal shrinkage, block urceolus side twist-lock and use hole 11.
When wire sleeve 4 has been entrenched in the housing 1, make its outer cylinder body 7 bonding with housing 1 with bonding agent.Constitute movable part rotary locking mechanism with hole portion 11, spherical guide side lock with hole portion, rotation lock rationed marketing 51 and pin embedded hole portion 79 with urceolus side twist-lock then.In addition, the assembling of movable part 50 is undertaken by the female screw portion 78 of the pin thread of iron mandrel 52 and movable axis 51 rearward end is screwed togather.
Place waterproof ring (O shape ring) 13A in slot part 13 in that the waterproof ring of the peripheral part of end cap 12 is chimeric, wire sleeve 4 is embedded in the housing 1 fixing, at this moment contact with the inner peripheral surface of housing 1, guarantee stable water resistance by waterproof ring 13A.Movable axis 51 can move along its axis maintenance by wire sleeve 4 relative housings 1.In addition, the rear portion of iron mandrel 52 connects the rearward end (being pressed into portion 16) of rotation-preventing member 5, the iron core member 53 that is configured in the iron mandrel 52 is inserted in the coil former 24, constitutes differential transformer 6 by the coil case 6A of this iron core member 53 and above-mentioned differential transformer.
In addition, dock with the docking section of component side turn lock part 21 by the docking section 3A that makes case side turn lock part 2, make rotation-preventing member 5 relative housings 1 location, the protuberance 3 of housing 1 is positioned on the par 19 of perimembranous of rotation-preventing member 5, thereby can stops the rotation of this rotation-preventing member 5.
The leading section of conical helical spring 48 is linked to each other with spring-loaded portion 56 on being arranged on iron mandrel 52, making thereafter, the end links to each other with spring 5 supports 18 of rotation-preventing member 5, elastic force by this conical helical spring 48 is pressed to the place ahead with movable part 50, makes the front portion of movable axis 51 outstanding forward from the front end of housing 1.
The action of the displacement detector of above-mentioned formation then is described.
Displacement detector is contained in assigned position, make the moving body (not shown) unshift, be under the state (limit of stretch position) that the contact shoe 71 with displacement detector do not disturb at this moving body, such shown in Figure 23 (1), movable part 50 extrudes forward by the elastic force of conical helical spring 48, and the stopper portions 55 that is arranged in the iron mandrel 52 is docked with urceolus side stopper portions 7B on the interior perimembranous that is arranged on outer cylinder body 7.At this moment rotation lock rationed marketing 51A does not bump with the exterior region 15a of hole portion 15 with the exterior region 11a of hole portion 11 and spherical guide side twist-lock with urceolus side twist-lock and connects.
Therefore, owing to can prevent rotation lock rationed marketing 51A distortion, prevent that shotpin 51A is indeformable because this rotates, and the position deviation of the iron core member 53 of differential transformer 6 is eliminated, thereby can improve accuracy of detection.
When displacement detector is supplied with alternating current, just flow through electric current in first, second coil 30,31 because of electromagnetic induction.When iron core member 53 made first, second iron- core coil 30,31 equate to stride in the center, the absolute value of the voltage that produces in first, second coil 30,31 equated.
Make the moving body displacement, disturb the contact shoe 71 of displacement detector, shown in Figure 23 (2), when making movable part 50 opposings head into conical helical spring, the iron core member 53 that remains on the movable part 50 moves in the coil former 24 of differential transformer 6 from mind-set rear wherein, and major part is inserted in second coil, 31 sides.The voltage of second coil, 31 inductions is increased, and the amount of movement of output voltage and iron core member 53 changes pro rata.By the variation of this output voltage, detect the displacement of moving body.
At this moment, heading on the extreme position, the stopper portions 58 that is arranged in the iron mandrel 52 is docked with stopper portions 18A in the spring-loaded portion 18 that is arranged on rotation-preventing member 5.At this moment rotation lock rationed marketing 51A does not collide with the hinder marginal part of hole portion 15 with the hinder marginal part 11b of hole portion 11 and spherical guide side twist-lock with urceolus side twist-lock and connects.
Therefore can prevent the distortion of rotational pin 51, because this rotation lock rationed marketing 51A is indeformable, and the position deviation of the iron core member 53 of differential transformer 6 is eliminated, thereby be improved accuracy of detection.
According to above-mentioned embodiments of the present invention, twist-lock is set respectively on the outer cylinder body 7 of wire sleeve 4 and billowing pearl guide rail 9, and (urceolus side twist-lock is with hole portion 11 with hole portion, spherical guide side twist-lock hole portion 15), the pin embedded hole portion 79 of the chimeric usefulness of rotation lock rationed marketing 51A is set on movable axis 15, this twist-lock can be inserted (urceolus side twist-lock hole portion 11 of twist-lock hole portion along the moving direction of movable part 50 movably with pin 51A, spherical guide side twist-lock hole portion 15) in, and rotation lock rationed marketing 51 is inserted in the pin embedded hole portion 79, to constitute the movable part rotary locking mechanism, therefore can make the body interior that is contained in displacement detector in the movable part rotary locking mechanism, can make the displacement detector minor diameterization by the gap of restriction radial direction, and short bodyization, can guarantee the intensity of movable axis 51, make the handling ease of movable axis 51.
Because the twist-lock in wire sleeve 4 is along the long oblong-shaped of the moving direction of movable part 50 with hole portion (urceolus side twist-lock with hole portion 11, spherical guide side twist-lock with hole portion 15), so rotation lock rationed marketing 51A can not be stuck in rotation with in the locking hole portion (urceolus side twist-lock hole portion 11, spherical guide side twist-lock hole portion 15), thereby moving of movable part 50 carried out smoothly.
Owing to seal outer cylinder body twist-lock hole portion 11 with heat-shrinkable tube 10A, and can make wire sleeve 4 be entrenched in the housing back with bonding agent when bonding, can prevent that bonding agent from entering twist-lock with in the hole portion (urceolus side twist-lock with hole portion 11, spherical guide side twist-lock with hole portion 15).
In addition, according to above-mentioned embodiment of the present invention, even being pressed on the limit of causing that be pressed at the limit of stretch of the movable part 50 that causes by conical helical spring 48 and movable part 50, owing to do not dock with hole portion (urceolus side twist-lock with hole portion 11, spherical guide side twist-lock with hole portion 15) with forward and backward end 11a, 15a, 11b, 15b at rotation lock rationed marketing 51A and twist-lock, and can prevent the distortion of rotation lock rationed marketing 15A, and, and the position deviation of the iron core member 53 in the differential transformer 6 is eliminated because rotation lock rationed marketing 51A is indeformable.
In addition, according to above-mentioned embodiment of the present invention, on iron mandrel 52 and rotation-preventing member 5, spring-loaded portion 56 and 18 are set respectively, between described spring-loaded portion 56,18, place conical helical spring 48, the tapered portion of avoiding with conical helical spring 48 interference 57 is set in iron mandrel 52, even displacement detector miniaturization whereby, also because this conical helical spring 48 diminishes with the interference of parts on every side, so both can reduce the operating physical force of movable part 50, help the miniaturization of displacement detector again.
According to above-mentioned embodiments of the present invention, make movable axis 51 and measure sub-holding member difference to some extent, the end cap 12 of the long maintaining part 14 of rear side rubber is set on the outer cylinder body 7 of wire sleeve 4, on the sub-holding member 6 of mensuration, front side gum sleeve fitting portion 64 is set, to measure sub-holding member 61 on the front side gum sleeve maintaining part 64 and be installed on the gum sleeve 66 by the front side portion of gum sleeve 66 is entrenched in, the sub-holding member 61 of mensuration is combined with the leading section of movable axis 5, and the rear lateral portion that makes gum sleeve 66 is entrenched on the chimeric maintaining part 14 of rear side gum sleeve, can prevent the internal injury of rubber blanket whereby.
So displacement detector of the prior art as shown in figure 28, when when assembling is entrenched in gum sleeve 123 on the movable axis 125 from measuring sub 124 sides, the inner face (sealing surface) of the sealing 123a of gum sleeve 123 is scratched by the outer screw section of this movable axis 125, and can eliminate the improper like this part of guaranteeing stable sealing difficulty of the prior art according to the present invention.
In addition, as shown in figure 21, because end cap 12 at wire sleeve 4, and the chimeric maintaining part 14 of rear side gum sleeve can be set on this end cap mouth 12, can make the rear side of the rear lateral portion of gum sleeve 66 be kept chimeric by the chimeric maintaining part 14 of this rear side gum sleeve, thereby can guarantee that this rear side is by the thickness of fitting portion (sealing) 68 by fitting portion (sealing) 68.Owing to can guarantee the magnitude of interference of sealing 66a of the rear lateral portion of gum sleeve 66, thereby can guarantee stable water resistance.
Therefore in the prior art, as shown in figure 22, the chimeric maintaining part 14-1 of rear side gum sleeve is set on housing 1, the rear side of gum sleeve 66 is diminished by the magnitude of interference of fitting portion 66a, and abundant waterproof.
In addition, according to above-mentioned embodiments of the present invention, it is chimeric with groove 13 that waterproof ring is set on the periphery of end cap 12, waterproof ring 13A is set on groove 13 in that waterproof ring is chimeric, with wire sleeve 4 is chimeric when being fixed in the housing 1, make waterproof ring 13 make the inner peripheral surface contact of housing 1, can guarantee stable water proofing property.
In addition, according to above-mentioned embodiments of the present invention, with synthetic resin cable lead division 74 is integrally formed on the cable 46, and draw cable 46 from the rear end side of housing 1 in the rear end side that cable lead division 74 is entrenched in housing 1 time, whereby, because cable lead division 74 need not used another parts, so can reduce number of components, thereby both can reduce cost, and can obtain firm and stable cable again and draw precision, and the anti-flexion performance of cable is improved.
In addition, according to above-mentioned embodiments of the present invention, bonding agent is set on the peripheral part of cable lead division 74 to be accumulated with slot part 76, sealing is set with jut 77 in slot part 76 at this bonding agent, accumulate with filling bonding agent F in the slot part 76 at bonding agent,, sealing is contacted with projection 77 with the inner peripheral surface of housing 1 in that cable lead division 74 is chimeric when being fixed in the housing 1, accumulate with encapsulation bonding agent F in the slot part 76 at bonding agent, can guarantee stable water resistance whereby.
In addition, according to above-mentioned the present invention, by the docking section 3A formation case side turn lock part 2 of formation on the protuberance of giving prominence to the central side of housing 13 with the direction of the axis normal of housing 1, by on the external of rotation-preventing member 5, forming par 19, and on the end of this par 19, form docking section 20 component parts side turn lock parts 21 with the direction of the axis normal of housing 1, after under the state that twist-lock parts 5 are inserted in the housing 1, making protuberance 3 be positioned on the par 19, make docking section 3A, 20 dock the location of carrying out rotation-preventing member 5 mutually, can prevent to rotate.
As mentioned above, according to displacement detector of the present invention, can make the inside that is contained in displacement inspection device in the movable part rotary locking mechanism, the gap that both can suppress a radial direction, just can make the minor diameterization of displacement detector, and can make short bodyization, can also guarantee the intensity of movable axis, make the handling ease of movable axis.
Claims (13)
1. displacement detector, this detecting device has following formation: the wire sleeve with outer cylinder body and movable part support is set in housing, described movable part support can move along the axis direction of this outer cylinder body, and the movable part that can move along the axis direction of above-mentioned housing by above-mentioned wire sleeve is set, this movable part has the movable axis of the iron core member that keeps differential transformer, front at above-mentioned movable axis is provided with contact shoe, outwards suppress above-mentioned movable part by the back-moving spring parts, and utilize the rotary locking mechanism of movable part to lock the rotation of above-mentioned movable part; It is characterized in that this detecting device has following formation:
On the above-mentioned outer cylinder body of above-mentioned wire sleeve and above-mentioned movable part support, twist-lock hole portion is set respectively, the insertion fitting portion that inserts the twist-lock parts is set on above-mentioned movable axis, make these twist-lock parts can insert above-mentioned twist-lock hole portion movably along the moving direction of above-mentioned movable part, and above-mentioned twist-lock parts are inserted and be entrenched in above-mentioned insertion fitting portion, constitute above-mentioned movable part rotary locking mechanism whereby.
2 displacement detectors as claimed in claim 1 is characterized in that: the above-mentioned twist-lock separately of above-mentioned outer cylinder body and above-mentioned movable part support is to serve as the rectangle on long limit with the moving direction along above-mentioned movable part with hole portion.
3 displacement detectors as claimed in claim 2 is characterized in that: with the above-mentioned twist-lock hole portion of the above-mentioned outer cylinder body in heat-shrinkable tube envelope position.
4. displacement detector as claimed in claim 3 is characterized in that:
The protuberance of going into to its center pleurapophysis is set in above-mentioned housing, is forming the docking section on the direction with respect to the axis quadrature of above-mentioned housing on this protuberance;
In above-mentioned housing, rotation-preventing member is set, on the external of this rotation-preventing member, forms the par, in the docking section of the end of this par formation with the direction of the axis quadrature of above-mentioned housing;
On above-mentioned par, make the raised part location and above-mentioned docking section is prevented fetching location and the rotation of carrying out above-mentioned rotation-preventing member mutually.
5. displacement detector as claimed in claim 4, it is characterized in that: form raised part by the above-mentioned housing of punch process, by the peripheral part of the above-mentioned housing of centerless grinder grinding, make the thickness of shell attenuation, thereby guarantee that the outstanding size of raised part reaches the size of regulation.
6. displacement detector as claimed in claim 1 is characterized in that: have following formation:
First, second fixation side stopper portions is set on above-mentioned housing, first, second movable side stopper portions is set on above-mentioned movable part;
The stretching gauge of the above-mentioned movable part that is produced by above-mentioned back-moving spring parts is by the above-mentioned first movable side stopper portions being docked with the above-mentioned first fixation side stopper portions constitute holding between above-mentioned twist-lock parts and the leading section of above-mentioned twist-lock with hole portion;
The gauge that is pressed into that is pressed into generation by above-mentioned movable part is to constitute by under the state of holding the gap between above-mentioned twist-lock parts and the rearward end of above-mentioned twist-lock with hole portion the above-mentioned second movable side stopper portions is docked with the above-mentioned second fixation side stopper portions.
7. displacement detector as claimed in claim 4 is characterized in that: have following formation:
First, second fixation side stopper portions is set on above-mentioned housing, first, second movable side stopper portions is set on above-mentioned movable part;
The stretching gauge of the above-mentioned movable part that is produced by above-mentioned back-moving spring parts is by the above-mentioned first movable side stopper portions being docked with the above-mentioned first fixation side stopper portions constitute holding between above-mentioned twist-lock parts and the leading section of above-mentioned twist-lock with hole portion;
The gauge that is pressed into that is pressed into generation by above-mentioned movable part is to constitute by under the state of holding the gap between above-mentioned twist-lock parts and the rearward end of above-mentioned twist-lock with hole portion the above-mentioned second movable side stopper portions is docked with the above-mentioned second fixation side stopper portions.
8. displacement detector as claimed in claim 7 is characterized in that:
The first fixation side stopper portions is set on the above-mentioned outer cylinder body of above-mentioned wire sleeve, the above-mentioned second fixation side stopper portions is set on above-mentioned rotation-preventing member, on above-mentioned movable axis, iron mandrel is set, above-mentioned first, second movable side stopper portions is set in this iron mandrel.
9. displacement detector as claimed in claim 8, it is characterized in that: on above-mentioned iron mandrel and above-mentioned rotation-preventing member, spring-loaded portion is set respectively, make above-mentioned back-moving spring parts between this spring-loaded portion, constitute this back-moving spring parts by conical helical spring, the tapered portion of avoiding with above-mentioned conical helical spring interference is set in this iron mandrel.
10. displacement detector as claimed in claim 1, it is characterized in that: above-mentioned movable axis and maintenance are measured the sub-holding member of mensuration of son as other parts, end cap with the chimeric maintaining part of rear side sleeve pipe is set on the above-mentioned outer cylinder body of above-mentioned wire sleeve, sleeve pipe chimeric maintaining part in front side is set on the sub-holding member of said determination, be installed on the above-mentioned gum sleeve by the front side portion of gum sleeve being entrenched on the chimeric maintaining part of above-mentioned front side sleeve pipe and the sub-holding member of said determination, the sub-holding member of said determination is combined on the above-mentioned movable axis front end, the rear lateral portion of above-mentioned gum sleeve is entrenched on the chimeric maintaining part of above-mentioned rear side sleeve pipe.
11. displacement detector as claimed in claim 10, it is characterized in that: the peripheral part at above-mentioned end cap is provided with the chimeric slot part of using of waterproof ring, with slot part waterproof ring is set in that above-mentioned waterproof ring is chimeric, in that the above-mentioned outer cylinder body of above-mentioned wire sleeve is chimeric when being fixed on the above-mentioned housing, make above-mentioned waterproof ring contact on the inner peripheral surface of above-mentioned housing.
12. displacement detector as claimed in claim 1 is characterized in that: be connected above-mentioned differential
Use the integrally formed cable lead division of synthetic resin on the cable of the coil sides of transformer, so that above-mentioned cable
Lead division is entrenched on the rear end side of above-mentioned housing and from the rear end side of above-mentioned housing and draws.
13. displacement detector as claimed in claim 12, it is characterized in that: at the peripheral part of above-mentioned cable lead division bonding agent is set and accumulates and use slot part, accumulate with forming the sealing jut in the slot part at this bonding agent simultaneously, accumulate with slot part filling bonding agent at above-mentioned bonding agent, so that in that above-mentioned cable lead division is chimeric when being fixed on the above-mentioned housing, above-mentioned sealing is contacted with the inner peripheral surface of above-mentioned housing with jut, and above-mentioned bonding agent is encapsulated in above-mentioned bonding agent and accumulates with on the slot part.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001166053A JP3548752B2 (en) | 2001-06-01 | 2001-06-01 | Displacement detector |
| JP166053/01 | 2001-06-01 | ||
| JP166692/01 | 2001-06-01 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021221529A Division CN1213278C (en) | 2001-06-01 | 2002-05-31 | Displacement detecting device and displacement detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1690646A CN1690646A (en) | 2005-11-02 |
| CN100339677C true CN100339677C (en) | 2007-09-26 |
Family
ID=19008640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100738261A Expired - Fee Related CN100339677C (en) | 2001-06-01 | 2002-05-31 | Displacement detector |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3548752B2 (en) |
| CN (1) | CN100339677C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005006806A1 (en) * | 2004-09-01 | 2006-03-30 | Priamus System Technologies Ag | Method and apparatus for measuring physical quantities with piezoelectric sensors |
| CN102395867B (en) * | 2009-04-16 | 2014-01-29 | 株式会社阿米泰克 | Torque sensor |
| CN103353273A (en) * | 2013-07-10 | 2013-10-16 | 中国科学院理化技术研究所 | Portable displacement meter for measuring 0.1 to 2000 micrometer |
| KR101477725B1 (en) * | 2014-03-10 | 2014-12-30 | 성균관대학교산학협력단 | Apparatus for driving coils in inductive search sensor and inductive search sensor system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4141148A (en) * | 1976-10-08 | 1979-02-27 | Mitutoyo Mfg. Co., Ltd. | Contour measuring apparatus |
| US5726350A (en) * | 1996-02-22 | 1998-03-10 | Mitutoyo Corporation | Contour measuring apparatus with a stylus |
| JP2001133205A (en) * | 1999-11-04 | 2001-05-18 | Omron Corp | Displacement sensor |
-
2001
- 2001-06-01 JP JP2001166053A patent/JP3548752B2/en not_active Expired - Fee Related
-
2002
- 2002-05-31 CN CNB2005100738261A patent/CN100339677C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4141148A (en) * | 1976-10-08 | 1979-02-27 | Mitutoyo Mfg. Co., Ltd. | Contour measuring apparatus |
| US5726350A (en) * | 1996-02-22 | 1998-03-10 | Mitutoyo Corporation | Contour measuring apparatus with a stylus |
| JP2001133205A (en) * | 1999-11-04 | 2001-05-18 | Omron Corp | Displacement sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3548752B2 (en) | 2004-07-28 |
| JP2002357453A (en) | 2002-12-13 |
| CN1690646A (en) | 2005-11-02 |
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