CN201867419U - Rotating speed measuring device based on three-point tangential speed method - Google Patents
Rotating speed measuring device based on three-point tangential speed method Download PDFInfo
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- CN201867419U CN201867419U CN2010205921842U CN201020592184U CN201867419U CN 201867419 U CN201867419 U CN 201867419U CN 2010205921842 U CN2010205921842 U CN 2010205921842U CN 201020592184 U CN201020592184 U CN 201020592184U CN 201867419 U CN201867419 U CN 201867419U
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Abstract
The utility model relates to a rotating speed measuring device based on a three-point tangential speed method, comprising three tangential displacement measuring modules, an embedded system with an ARM processor as the core and an LCD (liquid crystal display) device. The non-contact tangential displacement measuring modules can obtain the displacement of an object relative to the tangential movement within a certain period. A measuring structure is designed accordingly. Through a plane geometric structure of a right-angled isosceles triangle formed by the three tangential displacement measuring modules which are distributed perpendicular to the cross section of a rotating shaft, a mathematical model of rotating speed measuring is established. A rotating speed value is obtained through the mathematical calculation of an embedded processor, and is output and displayed. Therefore, the non-contact and mark-free measuring of the rotating speed of a rotating body is realized and a real-time rotating speed measuring curve is displayed through the method of measuring the tangential speed of any three points of the cross section of the rotating body.
Description
Technical field
The utility model relates to a kind of rotation-speed measuring device of measuring the rotating object rotating speed, especially can carry out the hand revolution counter that non-contact measurement and transient speed are measured and shown.
Background technology
The method that detects the speeds of mainshaft such as motor, engine is divided into contact and contactless, and contact is that tachometer gage is installed on the testee, increase the load and the rotation that influences measured object of measured object.And contactless tachometer gage does not increase the load of measured object and do not influence the rotation of measured object, therefore, measures small-sized and rotating speed micromachine should adopt contactless.At present; the non-contact type tachometric table has electrometer numerical expression, stroboscopic formula, electromagnetic type etc.; they all need countershaft that aids such as reflective marker or increase gear are installed before measurement; but often be not suitable for mounting auxiliary sometimes under certain conditions; for example the bad cleaning of greasy dirt can't be pasted on the rotating shaft cross section, electric machine main shaft is sealed by cloche or because rotating machinery can not be shut down mounting auxiliary etc. in particular cases, these tachometer gages just can't be implemented to have measured.Though some stroboscopic formula tachometer gage does not need to paste reflective mark, need people's eyes to discern after, the manual adjustment flashing rate obtains rotating speed, intellectuality is very low, it is bigger to introduce error ratio.
Find by prior art documents, Chinese patent Granted publication CN201069443Y, patent name is: based on the rotation-speed measuring device of image recognition location, warp is referring to the description in its instructions, discovery has 2 problem values to inquire into: the firstth, need know measured diameter in advance, measure after the input diameters, under the situation of technical information deficiency, be difficult to carry out like this.The secondth, under the bigger situation of rotating shaft diameter, need to install the prolongation measuring section and provide diameter, utilize the measuring method that loads aid like this, embodiment is more loaded down with trivial details, and also occurs accident easily in the rotation process.
Summary of the invention
In order to overcome existing noncontact tachometric survey mode the loaded down with trivial details of aid such as reflecting marking need be installed, and can not carry out the demonstration of real-time speed curves, the utility model has designed a kind of bikini measurement structure of isosceles right triangle, by the turn method of any 3 tangential velocities of xsect of measurement, the unmarked measurement of noncontact of rotating speed and the demonstration of tachometric survey curve in real time realize turning.
The technical scheme that its technical matters that solves the utility model adopts is: rotation-speed measuring device comprises: three tangential displacement measurement modules, arm processor are the embedded system of core, liquid crystal indicator; The primary optical axis of the lens in three tangential displacement measurement modules is parallel to each other and perpendicular to the rotating shaft xsect, the intersection point in lens primary optical axis and cross section is arranged in the planar geometry of isosceles right triangle simultaneously, it is used to measure the tangential displacement of the corresponding measured point of rotating shaft xsect, and be electrically connected with the embedded system that is used to resolve 3 tangential velocity method mathematical models respectively, embedded system is electrically connected with the liquid crystal indicator that is used to export demonstration; Wherein the tangential displacement measurement module comprises: the optical lens of a certain curvature radius, a LASER Light Source, a photoinduction device, a controller; Lens are formed image capturing system in the place ahead of photoinduction device, and the photoinduction device is electrically connected with controller, fixes for making measuring distance, and the beam direction of LASER Light Source is electrically connected with the angled placement of lens primary optical axis direction and with the photoinduction device.
By the tangential displacement measurement module, can obtain the displacement of object relative measurement module tangential motion within a certain period of time.Measure the tangential displacement of the corresponding measured point of rotating shaft xsect with three tangential displacement measurement modules, the digital signal that obtains is transferred to controller through interface circuit and makes accumulation process, then by the flush bonding processor value, processor carries out mathematics by the mathematical model of 3 tangential velocity method measuring principles and resolves and obtain tachometer value, rotate all measured in one-period tachometer values with turning as a frame that shows output, the LCD drive unit drives liquid crystal display by flush bonding processor inside carries out the demonstration of real-time curve.Rotating speed mean value in this one-period shows as the tachometer value of turning.
3 tangential velocity method measuring principles: referring to Fig. 4 and Fig. 5, they are respectively the xsect of two rotating shafts of size, and respectively around separately center of rotation
ORotation,
A, B, C3 is three measurement points above the tested rotating shaft xsect, any 3 points that it is shone by the LASER Light Source in the tangential displacement measurement module, because measurement module is perpendicular to the rotating shaft xsect, so these three measurement points also constitute the isosceles right triangle structure.By the position relation of this triangle and center of rotation, can set up the mathematical model that concerns between these 3 tangential velocities and the rotating shaft rotational angular velocity.If
A, B, C3 tangential velocity is respectively
v 1 , v 2 , v 3 , the radius of gyration is
r 1 , r 2 , r 3 , the triangle right-angle side length of side is
l(being that known conditions is determined by the measurement module mounting distance), the rotating shaft rotational angular velocity is
ω, make boost line
BNPerpendicular to
AO,
CMPerpendicular to
AO, establish ∠
BAN=
α, and provable ∠
ACM=
αTherefore,
AN=lcos α,
BN=lsin α, can obtain equation by Pythagorean theorem:
（1）
Should use the same method and can obtain another equation:
（2）
Relation according to linear velocity and the angular velocity and the radius of gyration can obtain equation:
Formula (3), (4), (5) substitution formula (1), (2) and abbreviation are obtained a binary quadratic equation group:
（6）
Be the mathematical model that we will obtain.In the formula
ωWith
αBe variable, the group of solving an equation can obtain
ω, pass through formula at last
R=ω60/2
π, radian/per second is converted into commentaries on classics/per minute.
The beneficial effects of the utility model are, can directly carry out non-contact type tachometric under the situation of aid that does not need other and technical information measures, booster action has been played in the analysis that obtains real-time tachometric survey curve countershaft dynamic property simultaneously, the calculating of rotating speed and demonstration are finished by embedded system fully, and degree simple in structure, intelligent is than higher.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the connection diagram of system described in the utility model.
Fig. 2, Fig. 3 are respectively the relative installation synoptic diagram and the inner structure synoptic diagram of tangential displacement measurement module.
Fig. 4, Fig. 5 are measuring principle figure of the present utility model.
1. tested rotating shafts among the figure, 2. the tangential velocity measurement module 1, and 3. the tangential velocity measurement module 2, and 4. the tangential velocity measurement module 3,5. embedded system, 6. liquid crystal indicator, 7. optical lens, 8. LASER Light Source, 9. housing, 10. photoinduction device, 11. controllers.
Embodiment
In Fig. 1, Fig. 2, Fig. 3
, rotation-speed measuring device comprises: three tangential displacement measurement modules 2,3,4, arm processor are the embedded system 5 of core, liquid crystal indicator 6; Three tangential displacement measurement modules 2,3,4 are electrically connected with embedded system 5 by internal controller 11, and liquid crystal indicator 6 is electrically connected with embedded system 5; Wherein tangential displacement measurement module 2,3,4 comprises respectively: optical lens 7, LASER Light Source 8, photoinduction device 10, controller 11; Close position between them: lens 7 are formed image capturing system in the dead ahead of photoinduction device 10, photoinduction device 10 is electrically connected with controller 11, LASER Light Source 8 is electrically connected with photoinduction device 10, the installation site of light source should be satisfied: when lens primary optical axis and light beam intersect on the rotating shaft cross section, the angle angle of its light beam and lens 7 primary optical axis, equal distance between light source 8 and lens 7 primary optical axis divided by the arc-tangent value apart from the gained result of 1 of lens 7 and measured surface, obtained fixing measuring distance like this, this fixing measuring distance should be in the imaging scope of lens.
By Fig. 1, Fig. 2, shown in Figure 3, the primary optical axis of the lens 7 on three tangential displacement measurement modules 2,3,4 is parallel to each other and perpendicular to rotating shaft xsect 1, the intersection point in lens 7 primary optical axis and cross section 1 is arranged in the planar geometry of isosceles right triangle simultaneously, wherein module 2 is the summit of two footing for summit, the module 3,4 that forms the right angle, with the tangential displacement that three tangential displacement measurement modules 2,3,4 come synchro measure rotating shaft xsect 1 corresponding measured point, measuring process is as follows:
At first, the coherent light that is produced by LASER Light Source 8, it be radiated at the interference fringe that body surface produces and the hot spot point reflection that forms to photoinduction device 10, formed image electric signal is transferred to the signal processing system DSP of photoinduction device inside, DSP compared the image in a last sampling period of this signal of video signal and storage, resultant displacement information is transferred to controller 11 through interface circuit and makes accumulation process, then by flush bonding processor 5 values, processor 5 carries out mathematics by the mathematical model of 3 tangential velocity method measuring principles and resolves and obtain tachometer value, to turn at last and rotate tachometer value measured in the one-period as a frame that shows output, the LCD drive unit drives liquid crystal display 6 by flush bonding processor 5 inside carries out the demonstration of real-time curve.Rotating speed mean value in this one-period shows as the tachometer value of turning.
For satisfying higher sample frequency and resolution, adopt Agilent ADNS-6090 cake core as the photoinduction device, the main control chip of selecting the A2611 type for use is as controller, and it adopts ps2 agreement and embedded system to carry out data communication.Selecting for use with the S3C2410 processor is the embedded system of core, and it embeds (SuSE) Linux OS, and under this system, the interface development of display screen adopts the design of QT language development, can satisfy request for utilization.
Fig. 4, two kinds of metering systems when Figure 5 shows that use, shown in Figure 4 is to turn center of rotation outside constructed triangle; Shown in Figure 5 is to turn center of rotation within constructed triangle; The method of proof of dual mode is identical, and it is similar to draw mathematical model, can select metering system by switching mode during use, and the latter is more suitable for the smaller rotating shaft of diameter and measures.
Claims (4)
1. based on the rotation-speed measuring device of 3 tangential velocity methods, comprise three tangential displacement measurement modules, arm processor is the embedded system of core, liquid crystal indicator, it is characterized in that: the primary optical axis of the lens in three tangential displacement measurement modules is parallel to each other and perpendicular to the rotating shaft xsect, the intersection point in lens primary optical axis and cross section is arranged in the planar geometry of isosceles right triangle simultaneously, it is used to measure the tangential displacement of the corresponding measured point of rotating shaft xsect, and be electrically connected with the embedded system that is used to resolve 3 tangential velocity method mathematical models respectively, embedded system is electrically connected with the liquid crystal indicator that is used to export demonstration.
2. the rotation-speed measuring device based on 3 tangential velocity methods according to claim 1 is characterized in that: the tangential displacement measurement module comprises optical lens, LASER Light Source, photoinduction device, controller; Lens are formed image capturing system in the dead ahead of photoinduction device, and the photoinduction device is electrically connected with controller, and LASER Light Source is electrically connected with the photoinduction device.
3. the rotation-speed measuring device based on 3 tangential velocity methods according to claim 1 and 2 is characterized in that: embedded system is carried out communication according to the controller in ps2 agreement and the tangential displacement measurement module.
4. the rotation-speed measuring device based on 3 tangential velocity methods according to claim 2, it is characterized in that: the installation site of the LASER Light Source in the tangential displacement measurement module should be satisfied: when lens primary optical axis and light beam intersect on the rotating shaft cross section, the angle angle of its light beam and lens primary optical axis equals distance between light source and the lens primary optical axis divided by the arc-tangent value apart from the gained result between lens and measured surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010205921842U CN201867419U (en) | 2010-11-04 | 2010-11-04 | Rotating speed measuring device based on three-point tangential speed method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205921842U CN201867419U (en) | 2010-11-04 | 2010-11-04 | Rotating speed measuring device based on three-point tangential speed method |
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| CN201867419U true CN201867419U (en) | 2011-06-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105393123A (en) * | 2013-07-23 | 2016-03-09 | 京都电子工业株式会社 | Rotational speed detection device, viscosity measurement device using said device, rotational speed detection method, and rotating body used in said method |
| CN105606840A (en) * | 2014-11-18 | 2016-05-25 | 埃斯普罗光电股份公司 | Rotation angle sensor system |
| CN107121078A (en) * | 2017-05-12 | 2017-09-01 | 新疆维吾尔自治区计量测试研究院 | A kind of piston special comprehensive measuring system based on temperature, difference in height and rotating speed |
-
2010
- 2010-11-04 CN CN2010205921842U patent/CN201867419U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105393123A (en) * | 2013-07-23 | 2016-03-09 | 京都电子工业株式会社 | Rotational speed detection device, viscosity measurement device using said device, rotational speed detection method, and rotating body used in said method |
| CN105606840A (en) * | 2014-11-18 | 2016-05-25 | 埃斯普罗光电股份公司 | Rotation angle sensor system |
| CN105606840B (en) * | 2014-11-18 | 2020-02-18 | 埃斯普罗光电股份公司 | Rotation angle sensor system |
| CN107121078A (en) * | 2017-05-12 | 2017-09-01 | 新疆维吾尔自治区计量测试研究院 | A kind of piston special comprehensive measuring system based on temperature, difference in height and rotating speed |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110615 Termination date: 20121104 |