CN205373624U - Servo calibration system of miniature displacement meter - Google Patents
Servo calibration system of miniature displacement meter Download PDFInfo
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- CN205373624U CN205373624U CN201620147776.0U CN201620147776U CN205373624U CN 205373624 U CN205373624 U CN 205373624U CN 201620147776 U CN201620147776 U CN 201620147776U CN 205373624 U CN205373624 U CN 205373624U
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Abstract
The utility model relates to a servo calibration system of miniature displacement meter, wherein servo motor (20) promote adjustable shelf (40) removal through control installation in lead screw (30) of mount (10) left end, raster displacement sensor (50) can perception adjustable shelf (40) the displacement, and its signal output part connects the match arithmetic unit, install touch multitouch (401) on adjustable shelf (40), the free end of setting in displacement meter (60) of mount (10) right -hand member can be guaranteed to touch by the mounting height of touch multitouch (401), the free end of displacement meter (60) posts the paster of meeting an emergency to be connected through wire and match arithmetic unit. The utility model discloses accurately the calibration coefficient relation between value and the displacement value of meeting an emergency of miniature displacement meter is made to the rate, and light and handy nimble in addition, easy and simple to handle, the calibration is efficient, and adaptability is good, has higher practical value in geomechanical model test.
Description
Technical field
This utility model relates to instrument field, especially relates to a kind of miniature displacement meter servo calibration system.
Background technology
Geomechanical model test can the feature of model engineering structure, again can the geologic(al) factor impact on engineering stability such as approximate simulation rock mass tomography, it has extremely important effect in the engineerings such as water conservancy, mining, tunnel and is widely used, and the big-and-middle-sized arch dam of China substantially all did geomechanical model test.
In geomechanical model test, under load action, body structure surface and the basis misalignment within rock mass is one of main detection limit, the ess-strain situation of structure and basis rock mass and the safety at each position can be reflected by the displacement within the rock mass of basis, and then obtain the final Security analysis result of engineering.
Due to geomechanical model test, displacement measuring device must size is little, light weight, good stability, highly sensitive, and can inside model, outside install flexibly.For this, a kind of plain type resistance-type displacement meter based on full-bridge electrical measuring method of Department of Water Conservancy of Tsing-Hua University utility model, although it can be well adapted for the demand of geomechanical model test, but by this plain type resistance-type displacement meter based on full-bridge electrical measuring method, it is merely able to record strain data, it is impossible to directly obtain corresponding shift value.
Utility model content
The purpose of this utility model is for the problem that presently, there are, a kind of miniature displacement meter servo calibration system is provided, it rate can make the Relationship of Coefficients between strain value and the shift value of miniature displacement meter exactly, and this utility model is lightly flexible, easy and simple to handle, calibration efficiency is high, and adaptability is good, has higher practical value in geomechanical model test.
The purpose of this utility model is achieved through the following technical solutions:
This utility model provides a kind of miniature displacement meter servo calibration system, comprising:
Servomotor, leading screw, adjustable shelf, grating displacement sensor, displacement meter and fitting operation device；
Described servomotor is by controlling the rectilinear movement of leading screw rotation forces adjustable shelf；
Described grating displacement sensor can the displacement of adjustable shelf described in perception；And its signal output part connects the input of fitting operation device by wire；
Described adjustable shelf is provided with contact block；The setting height(from bottom) of described contact block ensure that the free end touching the displacement meter being arranged on fixed mount right-hand member；
The free end of described displacement meter posts strain paster, and is connected with the input of fitting operation device by wire.
Further, described strain paster is four, and symmetry is affixed on the tow sides of described displacement meter, and described strain paster is connected by full-bridge method.
Further, described fitting operation device utilizes equation below calculating to obtain calibration coefficient:
U=α εds
Wherein parameter u is the shift value of the adjustable shelf of NI output, and α is calibration coefficient, εdsRepresent the strain value from the NI displacement meter exported.
Further, the free end of described displacement meter is fixed with steel ball, and the setting height(from bottom) of described steel ball is lower than the peak of contact block on described adjustable shelf.
Further, described miniature displacement meter servo calibration system also includes:
It is arranged on the displacement meter installing rack of fixed mount right-hand member；
The left end of described displacement meter installing rack has mounting groove, and the lower end of described displacement meter is inserted in this mounting groove, and withstands displacement meter with jackscrew through this mounting groove.
Further, described mounting groove leaves circular hole, for interting for connecting the wire straining paster on displacement meter.
Further, the driving axle of described servomotor connects with leading screw, and the control end of described servomotor passes through connection programmable logic controller (PLC) PLC.
Be can be seen that by above-mentioned the technical solution of the utility model, this utility model touches the free end of displacement meter by adjustable shelf, and by the displacement of grating displacement sensor perception adjustable shelf and by posting the strain value of strain paster perception displacement meter at the free end of displacement meter, and then rate can make the Relationship of Coefficients between strain value and the shift value of miniature displacement meter exactly by fitting operation, and this utility model is lightly flexible, easy and simple to handle, calibration efficiency is high, adaptability is good, has higher practical value in geomechanical model test.
Accompanying drawing explanation
Fig. 1 is the front view of a kind of miniature displacement meter servo calibration system of the present utility model；
Fig. 2 is the top view of a kind of miniature displacement meter servo calibration system of the present utility model；
Fig. 3 is the left view of a kind of miniature displacement meter servo calibration system of the present utility model；
Fig. 4 is the connection circuit diagram straining paster in a kind of miniature displacement meter servo calibration system of the present utility model.
In accompanying drawing:
Fixed mount 10, first member plate 101, right end plate 102, first connecting rod 103, second connecting rod 104；Servomotor 20；Leading screw 30；Adjustable shelf 40, contact block 401；Grating displacement sensor 50；Displacement meter 60, steel ball 601；Displacement meter installing rack 70.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that the technical scheme of the application, below with reference to accompanying drawing, this utility model is described in further details.
The orientation terms such as upper and lower, left and right in present specification, front and rear are based on position relationship shown in the drawings and set up.Accompanying drawing is different, then corresponding position relationship is also possible to change therewith, therefore can not be interpreted as the restriction to protection domain with this.
This utility model provide a kind of miniature displacement meter servo calibration system, its structure as shown in Figure 1-Figure 3, including:
Fixed mount 10, servomotor 20, leading screw 30, adjustable shelf 40, grating displacement sensor 50, displacement meter 60, displacement meter installing rack 70, NI (not shown) and fitting operation device (not shown).
Fixed mount 10 is made by steel, and it includes first member plate 101, right end plate 102 and for connecting first connecting rod 103 and the second connecting rod 104 of first member plate and right end plate.Wherein first member plate 101 has axis hole, in this axis hole, bearing is installed, the feed rod part contact of the inner ring of this bearing and leading screw 30.
The axle that drives of servomotor 20 connects with the feed rod part of leading screw 30, specifically can be connected by flange, it is also possible to be socketed in axle sleeve by key and connect, it is also possible to connect otherwise.The control end of servomotor 20 passes through connection PLC (ProgrammLogicController, programmable logic controller (PLC)).
Adjustable shelf 40 can move left and right along the first connecting rod 103 of fixed mount 10 and second connecting rod 104.The left substrate of adjustable shelf 40 is socketed with screw, the threaded portion of this screw and leading screw 30 with the use of；The right substrate of adjustable shelf 40 is provided with contact block 401.This contact block 401 can be steel plate strip, it is also possible to be hard rubber block.
Grating displacement sensor 50 is used for the displacement that perception adjustable shelf 40 produces, it is two, it is separately positioned on the first connecting rod 103 of fixed mount and second connecting rod 104 above or inner side, installs especially by the pedestal being fixed on first connecting rod 103 and second connecting rod 104, and tighten screw and be fixed.This grating displacement sensor 50 is by circuit and NI (NationalInstruments, National Instruments, this NI is the product of National Instruments) it is attached, this grating displacement sensor 50 perceives adjustable shelf 40 and produces displacement, perceptual signal is passed to the first input end of NI, and NI reads out the shift value of this adjustable shelf 40.
Displacement meter 60 is arranged on displacement meter installing rack 70.Specifically having mounting groove at the left end of displacement meter installing rack 70, the lower end of this displacement meter 60 is inserted in this mounting groove, and withstands displacement meter 60 with jackscrew through this mounting groove；The upper end of displacement meter 60 is exposed (being referred to herein as free end), and the upper end of this displacement meter 60 is fixed with steel ball 601, and the setting height(from bottom) of this steel ball will lower than the peak of contact block 401 on the above-mentioned right substrate of adjustable shelf 40.This mounting groove leaves circular hole, for interting four wires of displacement meter 60.The tow sides of displacement meter 60 post two strain pasters respectively, use full-bridge type method as shown in Figure 4 to connect four wires, and are wired to second input of NI.In this Fig. 4, R1、R2、R3、R4The resistance of corresponding four strain pasters respectively.
Displacement meter installing rack 70 is arranged in the right end plate 102 of fixed mount 10, specifically has installing hole in right end plate 102, and the right-hand member of this displacement meter installing rack 70 is fixed in this installing hole.
The shift value of the input termination NI of fitting operation device and two data output ends of strain value, the outfan output calibration coefficient of fitting operation device.This fitting operation device can be independently arranged, it is also possible to integrated in a computer.
Operation principle of the present utility model is as follows:
Being rotated by PLC programming Control servomotor, along with the rotation of servomotor, power is by driving axle to pass to leading screw 30, and then drives leading screw 30 to rotate；Owing to the feed rod part of leading screw 30 is fixed on fixed mount 10, so the rotation of leading screw 30 can drive adjustable shelf 40 to move right, the contact block 401 being arranged on the right substrate of adjustable shelf 40 moves right also with adjustable shelf 40, movement along with adjustable shelf 40, the movable signal perceived is transferred to NI by grating displacement sensor 50, and displacement data is presented to user by this NI.When contact block 401 touches the little steel ball of displacement meter 60 upper end (free end), extrude the free end of miniature displacement meter 60, displacement meter 60 is made to bend, produce strain signal, this strain signal passes to NI by straining paster and the circuit that is connected with this strain paster, and this strain signal is changed into strain value by this NI.Finally utilize fitting operation device to adopt method of least square that shift value and strain value are carried out linear fit, obtain shift value and strain value conversion coefficient therebetween, i.e. calibration coefficient.
The concrete processing procedure of fitting operation device is as follows:
1) input shift value, this shift value is from the NI shift value exported.
2) input strain value, this strain value is from the NI strain value exported, and this strain value is obtained by following approach:
Displacement meter 60 bending is when deforming, and is attached to double-edged four the strain pasters of displacement meter 60 and produces that strain values are equal and contrary sign:
ε1=ε2=-ε3=-ε4=ε ... ... ... ... ... ... ... formula 1
In formula 1:
ε1、ε2、ε3、ε4Represent the strain value of four strain pasters respectively；ε represents strain value.
Relation between resistance and the strain value of strain paster meets equation below 2:
In formula 2:
Δ R represents increased resistance value；R represents resistance；K represents sensitivity of strain gauge；ε represents strain value；
For after the strain paster measurement that bridge circuit connects, the related measurement data obtained meets equation below 3:
In formula 3, Δ U represents voltage change；U represents the primary voltage accessing bridge circuit；ΔR1、ΔR2、ΔR3、ΔR4Represent the resistance R that four strain pasters are corresponding respectively1、R2、R3、R4Changing value；All the other parameters are identical with the implication of the relevant parameter in formula 1 and formula 2, are not detailed herein.
Equation below 4 can be developed into by formula 3:
In formula 4:
εdsRepresent from the NI strain value read, the i.e. strain value of displacement meter 60；All the other parameters are identical with the implication of the relevant parameter in formula 1, formula 2 and formula 3, are not detailed herein.
By formula 4 it can be seen that the strain value ε of displacement meter 60dsThe strain value ε of the strain paster being connected with by full-bridge type method is linear.
Because the shift value of the horizontal direction of the displacement meter 60 measured in model test is much smaller than the height of displacement meter 60, so the shift value of the horizontal direction of displacement meter 60 is approximate linear with the strain value of strain paster, say, that the strain value ε of the displacement meter 60 that the shift value of the horizontal direction of displacement meter 60 and NI readdsLinear；Again because the shift value of adjustable shelf 40 is approximate with the horizontal direction shift value of displacement meter 60, so the strain value ε of the shift value of the adjustable shelf 40 recorded and displacement meter 60dsLinear.
There is different shift values by controlling adjustable shelf 40, obtain many group its corresponding strain values of shift value, take its meansigma methods.Adopt method of least square that strain value and corresponding shift value are carried out linear fit, utilize formula 5 to obtain calibration coefficient:
U=α εds... ... ... ... ... ... ... ... formula 5
In formula 5, u is the shift value of adjustable shelf 40, and α is calibration coefficient, εdsRepresent the strain value from the NI displacement meter 60 read.
By above-mentioned detailed description of the invention of the present utility model it can be seen that this utility model carries out data acquisition by NI, it is possible to directly obtain strain data；Grating displacement sensor and NI are attached, and also can be read out the meansigma methods of adjustable shelf 40 change in displacement by NI.Controlled the rotation of servomotor by PLC system coding, and adopt above-mentioned way to read multiple different displacements and strain data, finally adopt method of least square to carry out linear fit, obtain shift value and strain value conversion coefficient therebetween.
At present, this cover system obtains application in the model tests such as Yang Fanggou arch dam, Da Gang Mountain arch dam, rock salt underground chamber, and achieves good effect.
Although this utility model is with preferred embodiment openly as above, but embodiment does not limit this utility model.Without departing from the spirit and scope of this utility model, any equivalence done changes or retouching, also belongs to the protection domain of this utility model.Therefore the content that protection domain of the present utility model should define with claims hereof is for standard.
Claims (7)
1. a miniature displacement meter servo calibration system, it is characterised in that described miniature displacement meter servo calibration system includes:
Servomotor (20), leading screw (30), adjustable shelf (40), grating displacement sensor (50), displacement meter (60) and fitting operation device；
Described servomotor (20) is by controlling leading screw (30) rotation forces adjustable shelf (40) rectilinear movement；
Described grating displacement sensor (50) can the displacement of adjustable shelf (40) described in perception；And its signal output part connects the input of fitting operation device by wire；
Described adjustable shelf (40) is provided with contact block (401)；The setting height(from bottom) of described contact block (401) ensure that the free end touching the displacement meter (60) being arranged on fixed mount (10) right-hand member；
The free end of described displacement meter (60) posts strain paster, and is connected with the input of fitting operation device by wire.
2. a kind of miniature displacement meter servo calibration system according to claim 1, it is characterised in that described strain paster is four, and symmetry is affixed on the tow sides of described displacement meter (60), and described strain paster is connected by full-bridge method.
3. one according to claim 2 miniature displacement meter servo calibration system, it is characterised in that described fitting operation device utilizes equation below calculating to obtain calibration coefficient:
U=α εds
Wherein parameter u is the shift value of the adjustable shelf (40) of NI output, and α is calibration coefficient, εdsRepresent the strain value from the NI displacement meter (60) exported.
4. a kind of miniature displacement meter servo calibration system according to claims 1 to 3 any one, it is characterized in that, the free end of described displacement meter (60) is fixed with steel ball (601), and the setting height(from bottom) of described steel ball (601) is lower than the peak of the upper contact block (401) of described adjustable shelf (40).
5. a kind of miniature displacement meter servo calibration system according to claim 4, it is characterised in that described miniature displacement meter servo calibration system also includes:
It is arranged on the displacement meter installing rack (70) of fixed mount (10) right-hand member；
The left end of described displacement meter installing rack (70) has mounting groove, and the lower end of described displacement meter (60) is inserted in this mounting groove, and withstands displacement meter (60) with jackscrew through this mounting groove.
6. one according to claim 5 miniature displacement meter servo calibration system, it is characterised in that leave circular hole in described mounting groove, is used for interting for connecting the upper wire straining paster of displacement meter (60).
7. one according to claim 6 miniature displacement meter servo calibration system, it is characterized in that, the driving axle of described servomotor (20) connects with leading screw (30), and the control end of described servomotor (20) passes through connection programmable logic controller (PLC) PLC.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620147776.0U CN205373624U (en) | 2016-02-26 | 2016-02-26 | Servo calibration system of miniature displacement meter |
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| CN201620147776.0U CN205373624U (en) | 2016-02-26 | 2016-02-26 | Servo calibration system of miniature displacement meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854593A (en) * | 2020-06-22 | 2020-10-30 | 同济大学 | Digital sensor based on multistage deformation surmounts early warning |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854593A (en) * | 2020-06-22 | 2020-10-30 | 同济大学 | Digital sensor based on multistage deformation surmounts early warning |
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