CN104655039A - Laser image detection device and method of air pre-heater rotor deformation - Google Patents

Laser image detection device and method of air pre-heater rotor deformation Download PDF

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CN104655039A
CN104655039A CN201510115348.XA CN201510115348A CN104655039A CN 104655039 A CN104655039 A CN 104655039A CN 201510115348 A CN201510115348 A CN 201510115348A CN 104655039 A CN104655039 A CN 104655039A
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air preheater
laser
rotor
preheater rotor
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CN104655039B (en
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赵佑民
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赵佑民
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Abstract

The invention discloses a laser image detection device of air pre-heater rotor deformation. The detection device comprises a laser emitter, an image acquirer and two light path channels, wherein the laser emitter is used for emitting a laser beam, one path of the light path channel is used for projecting the laser beam emitted by the laser emitter to the measurement base level of an air pre-heater rotor, and representing light spot positions; the other light path channel is used for transmitting the light spots of the laser beam, represented on the measurement base level of the air pre-heater rotor, to the image acquirer; the image acquirer is used for acquiring the light spot positions on the measurement base level and acquiring the variation of the light spot positions according to the different light spot positions, and outputting rotor deformation information after mathematical transformation of the deformation of the light spot positions is performed. The invention further discloses a laser image detection method of the air pre-heater rotor deformation. Through the adoption of the device and the method disclosed by the invention, measurement information is provided for the closed-loop control of a sealing clearance.

Description

The laser image pick-up unit of air preheater rotor deflection and detection method thereof
Technical field
The invention belongs to rotary regenerative air preheater inner rotator deflection field of measuring technique, be specifically related to a kind of laser image pick-up unit and detection method thereof of air preheater rotor deflection.
Background technology
" rotary regenerative air preheater ", also referred to as " Ljungstrom air heater ", hereinafter referred to as " air preheater ", is one of critical piece of large scale industry boiler, is the important energy-saving and cost-reducing equipment of boiler.It is a kind of heat exchanger in principle, and major function is the combustion air that the useless smoke pre-heating utilizing boiler combustion to discharge is about to enter boiler combustion, thus improves the thermal efficiency of boiler.
The primary structure of air preheater is a huge column type rotor, and the fan cylinder that this rotor is divided into dozens of to communicate up and down by the multiple seal diaphragms along radial direction, specialty is referred to as " gas-tight silo lattice ".Not connected between gas-tight silo lattice, wherein fill corrugated iron plate, be called for short " corrugated plate ", corrugated plate is packaged into integration module of certain scale by iron frame, and this module is called as " heat accumulating element ".
During rotary regenerative air heater work, the rotor of carrying heat accumulating element constantly rotates, the flue gas red-hot when heat accumulating element rotates to fume side transfers heat to heat accumulating element through the gap of corrugated plate, and the heat in heat accumulating element is taken away again by the cold air when heat accumulating element is rotated to air side through corrugated plate gap.By the continuous rotation of primary heater rotor, heat accumulating element is made to complete the exchange heat of flue gas and air alternately through flue and air channel.
In order to realize flue and the mutual separation between air channel and different blast air channel, each division surface devising upper and lower two pieces of fan-shaped seal cover boards, being called for short " fanning strip ", for separating different primary heater perform regions.
Inner at air preheater, red-hot flue gas enters air preheater from top, and cold air enters air preheater from bottom, so the Temperature Distribution of air preheater entirety is that upper end temperature height lower temperature is low; When producing from fume side, temperature is high, and when entering fume side from air side, temperature is low.Because air preheater rotor entirety is heated uneven, under the effect of the complicated thermal expansion in inside, during air preheater work, rotor can create the distortion of one " mushroom " shape.Because rotor center swell increment large lateral expansion amount is little, cause the relative primary heater one-piece construction in rotor outer to be sunk, and the size of this sunk type distortion also change with the change of boiler working load and duty.Overall rule is that more aximal deformation value is larger for production load.Because the size of deflection can change, so the seal clearance between the rotor rotated and fixing fanning strip is a mechanical quantity changed.Along with the type of furnace is different, its maximum changing range can from 0mm to 40mm more than.If do not process the seal clearance of this change, then a large amount of combustion airs does not enter furnace operation and is directly leaked to flue, causes blower fan short circuit power consumption to increase.Simultaneously because hot-air has taken away a large amount of effective heat energy by flue leakage, the decline of the boiler combustion thermal efficiency will be caused.
For this problem, current industrial widely used a kind of technical method is the seal clearance variable quantity adopting sensor measurement to cause because of thermal deformation, and adopt mechanical hook-up dynamic conditioning fanning strip position according to measurement result, for making up the seal clearance change that thermal deformation causes, thus maintenance seal clearance is an optimum constant values preset.By closed-loop control, this seal clearance roughly can be stabilized in about 1mm, can reach the object obviously suppressing air preheater air leakage.What reveal due to primary heater bottom is cold air without preheating, and the hot-air being through preheating that top is revealed, and therefore usually preferentially in industrial practice installs this automatic control system at primary heater hot junction fanning strip.
Due to the temperatures as high 350 DEG C to 450 DEG C in the inner hot junction of primary heater, and containing a large amount of dusts and corrosive substance in flue gas, the how heat distortion amount of the primary heater rotor that stable detection is rotated in such rugged environment realizes the key problem in technology that above-mentioned closed loop seal clearance controls.
Wherein a kind of conventional detection method is probe rod type seal clearance detection technique, the method stretches into a mechanical feeler lever from primary heater externally to primary heater inside, the detector switch action when the termination of feeler lever touches the primary heater rotor of rotation, detection system can according to the deflection of the built-in length determination air preheater rotor of feeler lever during switch motion.
Because rotor when primary heater works rotates, rotating speed is about 1rpm, and because diameter is comparatively large, outside primary heater rotor, the linear velocity of deflection maximum can reach several metre per second (m/s), when feeler lever stretches into primary heater and rotor contact, stronger friction can occur.Effectively cannot lubricate because primary heater internal temperature is higher, cause occurring between feeler lever termination and rotor measurement reference field 11 significantly to wear and tear.Therefore this technology cannot the deflection of continuous coverage primary heater, and detection can only intermittently be carried out.During actual industrial uses, the failure rate of this technical method is higher, and plant maintenance workload is also larger.
Another kind of conventional detection method is high temperature modification eddy current displacement measurement technology, the method is based on current vortex range measurement principle, on the top of primary heater internal rotor measurement datum 11, a resistant to elevated temperatures test coil of eddy current is installed, noncontact between the measurement datum 11 of coil and rotation.Test coil of eddy current is interconnected by the metering circuit of high temperature resistant wire and primary heater outside, outer detecting circuit drives the measuring coil of primary heater inside, based on current vortex range measurement principle, can distance between non-contacting detection eddy current probe and metal reference field, thus realize the measurement of air preheater rotor deformation.
The advantage of this technology is that non-cpntact measurement does not have wear problem, therefore can carry out continuous print measurement.This technical method mainly contains the problem of three aspects:
1, the finding range of current vortex is less, and usual maximum range only has about 15mm.Measuring for realizing large-scale deflection, needing probe to be arranged on fanning strip to move up and down with fanning strip in actual use, realize controlling by the method measuring relative deformation.This working method causes mounting structure in the stove of eddy current probe to need mechanical displacement means, installs and uses cumbersome.
2, the corrosive substance of primary heater inside can corrode eddy current measurement coil and be connected wire, and dust stratification can cause electric parameter to change, and these factors all can cause measurement result to be drifted about, and have a strong impact on Air leakage control effect.Also directly can damage measurement mechanism during seriously corroded, system cannot be worked completely.Therefore the Reliability comparotive of this detection method is poor.
3, hold flimsy electronic unit due to part to be arranged in stove, cannot carry out keeping in repair and changing in boiler running process again once damage, cause primary heater to leak out and cannot effectively control for a long time, cause the comprehensive Air leakage control Be very effective of primary heater to decline.
Summary of the invention
In view of this, fundamental purpose of the present invention is the laser image pick-up unit and the detection method thereof that provide a kind of air preheater rotor deflection.
For achieving the above object, the technical scheme that the present invention takes is:
The embodiment of the present invention provides a kind of laser image pick-up unit of air preheater rotor deflection, and this pick-up unit comprises generating laser, image acquisition device, two-way path channels;
Described generating laser, for Emission Lasers bundle;
A wherein road path channels, for the laser beam projects launched by generating laser (3) measurement datum to air preheater rotor, and presents facula position;
Another road path channels, is transferred to image acquisition device for facula position laser beam presented on the measurement datum of air preheater rotor;
Described image acquisition device, for gathering the facula position on measurement datum, and obtains the variable quantity of facula position, by the variable quantity of facula position output rotor deflection information after mathematic(al) manipulation according to different facula positions.
In such scheme, this device comprises: the first L-type passage 1, second L-type passage, generating laser, image acquisition device, described first L-type passage 1 superposition is arranged on above the second L-type passage, and both are horizontally disposed with, the inwall of described first L-type passage vertical component is relatively set with minute surface, the corner of described first L-type passage 1 and the second L-type passage is provided with glass reflector, the exit of described first L-type passage is provided with seal glass in first of angle, the porch of described second L-type passage has been horizontally disposed with seal glass in second, described first L-type passage 1 and the second L-type passage are arranged on above air preheater rotor.
In such scheme, this device comprises: the first L-type passage, the second L-type passage, generating laser, image acquisition device, described first L-type passage superposition is arranged on above the second L-type passage, and both are horizontally disposed with, the inwall of described first L-type passage vertical component is relatively set with minute surface, the corner of described first L-type passage and the second L-type passage is provided with glass reflector, the exit of described first L-type passage is provided with seal glass in first of angle, and the porch of described second L-type passage has been horizontally disposed with seal glass in second; Fanning strip above described primary heater rotor measurement reference field is provided with the outstanding label with fanning strip action; Above the outstanding label that the fanning strip side that described first L-type passage and the second L-type passage are arranged on air preheater top is given prominence to.
The embodiment of the present invention also provides a kind of laser image detection method of air preheater rotor deflection, the method is: by laser transmitter projects laser beam, and laser beam is angularly projected on the measurement datum of air preheater rotor through a road path channels; When air preheater rotor distortion causes measurement datum change in location, the facula position of described laser beam projects on measurement datum also will change;
Image acquisition device gathers facula position through another road path channels, and the variable quantity of facula position is obtained according to different facula positions, and after numerical transformation delivery air primary heater rotor deformation information, regulate the position of fanning strip according to air preheater rotor deflection information.
In such scheme, the method is: the mirror-reflection that the minute surface of point-like laser bundle corner in the first L-type passage of described laser transmitter projects and the inwall of described first L-type passage vertical component are oppositely arranged, make the angled measurement datum projecting air preheater rotor of point-like laser bundle presents light spot image, image acquisition device by the mirror-reflection of corner in the second L-type passage collect the measurement datum of air preheater rotor be in diverse location time light spot image, the absolute change amount of air preheater rotor is obtained according to described light spot image.
In such scheme, the method is: the mirror-reflection that the minute surface of wordline laser beam corner in the first L-type passage of described laser transmitter projects and the inwall of described first L-type passage vertical component are oppositely arranged, make the angled measurement datum projecting air preheater rotor of a wordline laser beam presents row's light spot image, image acquisition device by the mirror-reflection of corner in the second L-type passage collect the measurement datum of air preheater rotor be in diverse location time row's light spot image, the absolute change amount of air preheater rotor is obtained according to described row's light spot image.
In such scheme, the method is: the mirror-reflection that the minute surface of wordline laser beam corner in the first L-type passage of described laser transmitter projects and the inwall of described first L-type passage vertical component are oppositely arranged, make a wordline laser beam angled project air preheater rotor measurement datum and the outstanding label given prominence to of fanning strip on present two rankings and put different wire light spot images, image acquisition device gathers described two rankings by the mirror-reflection of corner in the second L-type passage and puts different wire light spot images, according to the absolute position of described two winding displacement shaped laser spot images, and alternate position spike between the two, obtain the seal clearance that fanning strip is relative with air preheater rotor.
In such scheme, described generating laser is a word line laser device, and described imageing sensor adopts array image sensor.
In such scheme, measurement result is transferred to computer for controlling, the height of fanning strip is regulated by the computer for controlling motor action processed by analysis in rear control topworks, make described fanning strip follow the tracks of the deflection of air preheater rotor, control seal clearance and maintain all the time in the range of allowable error near setting value.
Compared with prior art, beneficial effect of the present invention:
1) technical scheme of the present invention and probe rod type technology are in a ratio of non-contact measurement, do not have mechanical wear problem in use procedure, and measurement effect can stable for extended periods of time.
2) technical scheme of the present invention large linearity of measurement range compared with current vortex technology is good, and measurement mechanism detects without the need to moving the gamut that can realize air preheater rotor deformation with fanning strip, and therefore the installation and maintenance of equipment are easier;
3) technical scheme of the present invention can measure rotor deformation and seal clearance two parameters simultaneously, can provide more fully primary heater work state information for the controlled quentity controlled variable of seal clearance control system calculates.
4) generating laser of the present invention, image acquisition device are installed in air preheater outside, and therefore electronic equipment does not directly contact with high temperature corrosion environment, do not exist in long-time running because of parameter drift problem that component corrosion causes.
5) after the electronic unit such as laser instrument and image acquisition device that the present invention is arranged on primary heater outside breaks down, just online maintenance and replacing be can carry out to trouble unit without the need to shutdown of boiler maintenance by the time, effective run time and the reliability of equipment therefore can be improved.
6) the present invention is arranged on the closed optical path that the parts in air preheater inside are just made up of housing, seal glass and high temperature resistant catoptron, avoid air preheater internal water to rinse and high pressure steam blows the grey impact on deflection measurement mechanism, the longer service life stability of equipment is better.
Accompanying drawing explanation
A kind of structure of the detecting device schematic diagram detecting air preheater rotor deformation that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the schematic diagram that position installed and used by measurement mechanism of the present invention on primary heater.
Fig. 3 is ultimate principle and the light channel structure that the present invention realizes primary heater rotor deformation;
Fig. 4 is the schematic diagram of laser facula of the present invention in the image measuring apparatus visual field;
Fig. 5 is the schematic diagram that a kind of employing provided by the invention one word line laser device measures two parameters simultaneously;
Fig. 6 is the schematic diagram of laser facula in the image measuring apparatus visual field that two parameter of the present invention is measured.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The embodiment of the present invention provides a kind of laser image pick-up unit of air preheater rotor deflection, and this pick-up unit comprises generating laser 3, image acquisition device 4, two-way path channels;
Described generating laser 3, for Emission Lasers bundle;
A wherein road path channels, for the laser beam projects launched by generating laser 3 measurement datum 11 to air preheater rotor, and presents facula position;
Another road path channels, is transferred to image acquisition device 4 for facula position laser beam presented on the measurement datum 11 of air preheater rotor;
Described image acquisition device 4, for gathering the facula position on measurement datum 11, and obtains the variable quantity of facula position, by the variable quantity of facula position output rotor deflection information after mathematic(al) manipulation according to different facula positions.
Embodiment 1:
The embodiment of the present invention provides a kind of laser image pick-up unit of air preheater rotor deflection, as shown in Figure 1, this device comprises: the first L-type passage 1, second L-type passage 2, generating laser 3, image acquisition device 4, described first L-type passage 1 superposition is arranged on above the second L-type passage 2, and both are horizontally disposed with, the inwall of described first L-type passage 1 vertical component is relatively set with minute surface 9, the corner of described first L-type passage 1 and the second L-type passage 2 is provided with glass reflector 10, the exit of described first L-type passage 1 is provided with seal glass 12 in first of angle, the porch of described second L-type passage 2 has been horizontally disposed with seal glass 13 in second, described first L-type passage 1 and the second L-type passage 2 are arranged on above air preheater rotor.
Described first L-type passage 1, second L-type passage 2 is respectively arranged with stove external seal glass 7 near one end of generating laser 3, image acquisition device 4, and described generating laser 3, image acquisition device 4 are arranged on the outside of air preheater furnace wall 8.
Embodiment 2:
The embodiment of the present invention provides a kind of laser image pick-up unit of air preheater rotor deflection, as Fig. 1, shown in 2, this device comprises: the first L-type passage 1, second L-type passage 2, generating laser 3, image acquisition device 4, described first L-type passage 1 superposition is arranged on above the second L-type passage 2, and both are horizontally disposed with, the inwall of described first L-type passage 1 vertical component is relatively set with minute surface 9, the corner of described first L-type passage 1 and the second L-type passage 2 is provided with glass reflector 10, the exit of described first L-type passage 1 is provided with seal glass 12 in first of angle, the porch of described second L-type passage 2 has been horizontally disposed with seal glass 13 in second, fanning strip 5 above air preheater rotor measurement datum 11 is provided with the outstanding label 6 with fanning strip 5 action, above the outstanding label 6 that fanning strip 5 side that described first L-type passage 1 and the second L-type passage 2 are arranged on air preheater top is given prominence to.
Described first L-type passage 1, second L-type passage 2 is respectively arranged with stove external seal glass 7 near one end of generating laser 3, image acquisition device 4, and described generating laser 3, image acquisition device 4 are arranged on the outside of air preheater furnace wall 8.
For solving the installation environment problem of generating laser and image measuring apparatus, as shown in Figure 3, the present invention is in a closed L-type light path, adopt glass reflector 1 laser beam entered through stove external seal glass horizontal in low temperature environment oliquely downward to be reflected, make it enter the vertical cavity part of L-type light path.The glass reflector that can adapt to hot environment is housed in vertical cavity both sides, laser beam reflects through several between glass reflector 3 and glass reflector 4, enter high temperature measurement environment in primary heater through seal glass in stove 1 at a certain angle again, and project at a certain angle on the reference field to be measured of air preheater rotor.Laser facula is incident upon image that rotor measurement reference field is formed through seal glass in stove 13, reflect through pyroceram catoptron 10, then through stove external seal glass, imaging on the intelligent camera outside stove, according to the principle described in inventive point 1, realize the measurement of rotor deformation.
The embodiment of the present invention provides a kind of pick-up unit for detecting Junker formula air preheater rotor deformation and seal clearance, as shown in Figure 1, this device comprises: the first L-type passage 1, second L-type passage 2, generating laser 3, image acquisition device 4, described first L-type passage 1 superposition is arranged on above the second L-type passage 2, and both are horizontally disposed with, two opposed inner walls of described first L-type passage vertical portion install mirror surface, the corner of described first L-type passage 1 and the second L-type passage 2 is all angularly provided with minute surface, the exit of described first L-type passage 1 is provided with the seal glass vertical with laser beam, above light path arrives air preheater inside for guiding laser beam, and be incident upon on the protrusion label of air preheater rotor measurement reference field and fanning strip 5 with incident angle 45 °, the width of measurement datum 11 and outstanding label 6 is all greater than 80mm, and under 45 ° of incident angle conditions, the limit range of measurement mechanism is 80mm.The instrument measurement scope that this embodiment sets is as-60 ~ 10mm; range 70mm leaves 10mm surplus; the object of setting forward measurement range is the measurement for realizing the reversible deformation of primary heater stopping process rotor; described first L-type passage 1 and the second L-type passage 2 are arranged on above the label 6 of air preheater top sector plate 5 side protrusion; because outstanding label 6 is different from the height of rotor on fanning strip 5, so the position that laser plays imaging after rotor with label 6 surface is different.
Described imageing sensor 4 gathers laser facula image on two planar by the minute surface of corner in the second L-type passage 2.Observe vertically downward because this example is equivalent to, so β=0 °, equivalent observation angle.Described imageing sensor 4 is a smart camera, intelligent camera can gather image to go forward side by side the computer installation of row relax.In this embodiment, the respective pixel scope of 70mm range on video camera is 1400pix (pixel), and the pixel resolution of measurement is about 0.05mm/pix.
The two ends of described first L-type passage 1 and the second L-type passage 2 are adopted transparent glass and are sealed, and like this, described first L-type passage 1 and the second L-type passage 2 are not affected by the external environment.
After described image processing system calculates seal clearance and rotor deformation, this example also comprises measurement result is transferred to computer for controlling, the motor action processed by analysis in rear control topworks by computer for controlling regulates to the height carrying out fanning strip 5, make fanning strip 5 follow the tracks of the deflection of rotor, control seal clearance and maintain all the time in the scope of a setting value.
The embodiment of the present invention also provides a kind of laser image detection method of air preheater rotor deflection, the method is: by generating laser 3 Emission Lasers bundle, and angularly project on the measurement datum 11 of air preheater rotor by laser beam through a road path channels; When air preheater rotor distortion causes measurement datum 11 change in location, the facula position of described laser beam projects on measurement datum 11 also will change;
Image acquisition device 4 gathers facula position through another road path channels, and the variable quantity of facula position is obtained according to different facula positions, and after numerical transformation delivery air primary heater rotor deformation information, regulate the position of fanning strip 5 according to air preheater rotor deflection information.
At a certain angle to rotor measurement reference field projecting laser bundle above air preheater rotor, this laser beam irradiation is on measurement datum, and measurement datum has certain width.As shown in Figure 3, P1, P2, P3 are the diverse location of rotor measurement reference field, and laser beam V is incident upon on rotor measurement reference field at a certain angle, and the angle α between definition laser beam and measurement datum normal is " incident angle ".In another angle formed an angle with incident ray, the imageing sensor of mounting strap camera lens, gathers the image of laser beam projects on rotor measurement reference field.Angle β between definition measurement datum normal and image sensor lens optical axis is " view angle ".According to optical principle, when measurement datum position is respectively at P1, P2, P3, laser projection point is respectively A, Z, B.That is when measurement datum position changes, the position of representation of laser facula on measurement datum also can change.
As shown in Figure 3, the laser projection point on measurement datum by lens imaging in the picture planar S of imageing sensor.A and b is being respectively as the imaging point in plane according to optical principle A, B 2.Z is the joint of image sensor lens optical axis and incoming laser beam, and its image position on the image sensor, in the center of image, is the reference point of survey calculation.
According to the optical principle of laser triangulation, take Z as zero point, rotor deformation H 2with coordinate offset amount H ' on imaging plane 2between relation meet following formula 1 and formula 2:
H 2 = DH 2 ′ cos α f sin ( α + β ) - H 2 ′ cos ( α + β ) Formula 1
H 1 = DH 1 ′ cos α f sin ( α + β ) + H 1 ′ cos ( α + β ) Formula 2
Wherein D is the distance that camera lens center o to Z puts, and f is lens focus α is laser incident angle, and β is view angle.
When alpha+beta=90 °, the movement locus of laser spots is parallel with picture plane, and transformation relation is now.
H 2 = D f H 2 ′ cos α Formula 3
Under incident angle α controlled condition, H 2with H ' 2be converted to linear relationship.
When view angle β=0 °, when namely imageing sensor is installed vertically downward, transformation relation is:
H 2 = DH 2 ′ cos α f sin ( α ) - H 2 ′ cos ( α ) Formula 4
H 1 = DH 1 ′ cos α f sin ( α ) + H 1 ′ cos ( α ) Formula 5
According to different service conditions, after carrying out coordinate conversion according to above-mentioned formula, laser facula coordinate in the picture can react the deflection of air preheater rotor.
After image conversion, laser spot position and air preheater rotor deformation set up corresponding relation, and the display mode on display interface as shown in Figure 4.After distortion occurs air preheater rotor, the position of light spot image in camera coverage moves down.Can be calculated the heat distortion amount of primary heater rotor by the relation comparing hot spot and scale, wherein the position of hot spot can adopt its barycentric coordinates to express.
Embodiment 3
The embodiment of the present invention provides the laser image detection method of an air preheater rotor deflection, the method is: the minute surface of point-like laser bundle corner in the first L-type passage 1 that described generating laser 3 is launched and the mirror-reflection that the inwall of described first L-type passage 1 vertical component is oppositely arranged, make the angled measurement datum 11 projecting air preheater rotor of point-like laser bundle presents light spot image, image acquisition device 4 by the mirror-reflection of corner in the second L-type passage 2 collect the measurement datum 11 of air preheater rotor be in diverse location time light spot image, the absolute change amount of air preheater rotor is obtained according to described light spot image.
Embodiment 4
The embodiment of the present invention provides a kind of laser image detection method of air preheater rotor deflection, the method is: the minute surface of wordline laser beam corner in the first L-type passage 1 that described generating laser 3 is launched and the mirror-reflection that the inwall of described first L-type passage 1 vertical component is oppositely arranged, make the angled measurement datum 11 projecting air preheater rotor of a wordline laser beam presents row's light spot image, image acquisition device 4 by the mirror-reflection of corner in the second L-type passage 2 collect the measurement datum 11 of air preheater rotor be in diverse location time row's light spot image, the absolute change amount of air preheater rotor is obtained according to described row's light spot image.
In embodiment 3,4, described generating laser 3 is a word line laser device, and described imageing sensor 4 adopts array image sensor.
For improving the applicability of measurement mechanism, as shown in Figure 4, laser instrument of the present invention also can adopt " wordline " laser instrument with certain line length except a laser, x-axis (transverse axis) keeping parallelism of the laser rays that word line laser instrument sends and camera coverage.Point shaped laser spot after adopting a word line laser device on measurement datum becomes the wire hot spot with certain length, coordinates to adopt array image sensor can shape measurement point in a row, constructs redundancy structure.When rotor flange face deforms, wire hot spot angle in the visual field is constant, and position moves up and down.The advantage adopting linear laser mating surface array image sensor is that Measurement reliability is high, and because the foreign matters such as dust stratification block light path, when causing hot spot defect as shown in Figure 4, system still normally can complete measurement function.
Embodiment 5
The embodiment of the present invention provides a kind of laser image detection method of air preheater rotor deflection, the method is: the minute surface of wordline laser beam corner in the first L-type passage 1 that described generating laser 3 is launched and the mirror-reflection that the inwall of described first L-type passage 1 vertical component is oppositely arranged, make a wordline laser beam angled project air preheater rotor measurement datum 11 and the outstanding outstanding label 6 of fanning strip 5 on present two rankings and put different wire light spot images, image acquisition device 4 gathers described two rankings by the mirror-reflection of corner in the second L-type passage 2 and puts different wire light spot images, according to the absolute position of described two winding displacement shaped laser spot images, and alternate position spike between the two, obtain the seal clearance that fanning strip 5 is relative with air preheater rotor.
Embodiment 5 is in order to realize two-parameter measurement, as shown in Figure 5, the present invention arranges a rising mark thing 6 on the fanning strip 5 of movement, a wordline laser beam is incident upon on outstanding label 6 and measurement datum 11 two objects under test simultaneously, and unified collection and technology of carrying out image.The image of laser facula in the imageing sensor visual field as shown in Figure 6.Because the position of fanning strip 5 is all the time higher than measurement datum 11, so the laser rays on the outstanding label 6 of fanning strip 5 is all the time higher than the laser rays on measurement datum 11, article two, laser rays alternate position spike deducts mark thickness on fanning strip, be the size of seal clearance, adopt this scheme to achieve the measurement in rotor absolute deformation amount and fanning strip and rotor opposing seal gap simultaneously, make sensor of the present invention for two-parameter measurement ability.
Finally, measurement result is transferred to computer for controlling, the height of fanning strip 5 is regulated by the computer for controlling motor action processed by analysis in rear control topworks, make described fanning strip 5 follow the tracks of the deflection of air preheater rotor, control seal clearance and maintain all the time in the range of allowable error near setting value.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.

Claims (9)

1. a laser image pick-up unit for air preheater rotor deflection, is characterized in that, this pick-up unit comprises generating laser (3), image acquisition device (4), two-way path channels;
Described generating laser (3), for Emission Lasers bundle;
A wherein road path channels, for the laser beam projects launched by generating laser (3) measurement datum (11) to air preheater rotor, and presents facula position;
Another road path channels, is transferred to image acquisition device (4) for facula position laser beam presented on the measurement datum (11) of air preheater rotor;
Described image acquisition device (4), for gathering the facula position on measurement datum (11), and obtain the variable quantity of facula position according to different facula positions, by the variable quantity of facula position output rotor deflection information after mathematic(al) manipulation.
2. the laser image pick-up unit of air preheater rotor deflection according to claim 1, it is characterized in that, this device comprises: the first L-type passage 1, second L-type passage (2), generating laser (3), image acquisition device (4), described first L-type passage 1 superposition is arranged on the second L-type passage (2) top, and both are horizontally disposed with, the inwall of described first L-type passage (1) vertical component is relatively set with minute surface (9), the corner of described first L-type passage 1 and the second L-type passage (2) is provided with glass reflector (10), the exit of described first L-type passage (1) is provided with seal glass (12) in first of angle, the porch of described second L-type passage (2) has been horizontally disposed with seal glass in second (13), described first L-type passage 1 and the second L-type passage (2) are arranged on above air preheater rotor.
3. the laser image pick-up unit of air preheater rotor deflection according to claim 1, it is characterized in that, this device comprises: the first L-type passage (1), second L-type passage (2), generating laser (3), image acquisition device (4), described first L-type passage (1) superposition is arranged on the second L-type passage (2) top, and both are horizontally disposed with, the inwall of described first L-type passage (1) vertical component is relatively set with minute surface (9), described first L-type passage (1 and second the corner of L-type passage (2) be provided with glass reflector (10), the exit of described first L-type passage (1) is provided with seal glass (12) in first of angle, the porch of described second L-type passage (2) has been horizontally disposed with seal glass in second (13), the fanning strip (5) of described primary heater rotor measurement reference field (11) top is provided with the outstanding label (6) with fanning strip (5) action, outstanding label (6) top that fanning strip (5) side that described first L-type passage (1) and the second L-type passage (2) are arranged on air preheater top is given prominence to.
4. the laser image detection method of an air preheater rotor deflection, it is characterized in that, the method is: by generating laser (3) Emission Lasers bundle, and angularly projects on the measurement datum (11) of air preheater rotor by laser beam through a road path channels; When air preheater rotor distortion causes measurement datum (11) change in location, the facula position of described laser beam projects on measurement datum (11) also will change;
Image acquisition device (4) gathers facula position through another road path channels, and the variable quantity of facula position is obtained according to different facula positions, and after numerical transformation delivery air primary heater rotor deformation information, according to air preheater rotor deflection information regulate fanning strip (5) position.
5. the laser image detection method of air preheater rotor deflection according to claim 4, it is characterized in that, the method is: the minute surface of point-like laser bundle corner in the first L-type passage (1) that described generating laser (3) is launched and the mirror-reflection that the inwall of described first L-type passage (1) vertical component is oppositely arranged, make the angled measurement datum (11) projecting air preheater rotor of point-like laser bundle presents light spot image, image acquisition device (4) collected by the mirror-reflection of the second L-type passage (2) interior corner the measurement datum (11) of air preheater rotor be in diverse location time light spot image, the absolute change amount of air preheater rotor is obtained according to described light spot image.
6. the laser image detection method of air preheater rotor deflection according to claim 4, it is characterized in that, the method is: the minute surface of wordline laser beam corner in the first L-type passage (1) that described generating laser (3) is launched and the mirror-reflection that the inwall of described first L-type passage (1) vertical component is oppositely arranged, make the angled measurement datum (11) projecting air preheater rotor of a wordline laser beam presents row's light spot image, image acquisition device (4) collected by the mirror-reflection of the second L-type passage (2) interior corner the measurement datum (11) of air preheater rotor be in diverse location time row's light spot image, the absolute change amount of air preheater rotor is obtained according to described row's light spot image.
7. the laser image detection method of air preheater rotor deflection according to claim 4, it is characterized in that, the method is: the minute surface of wordline laser beam corner in the first L-type passage (1) that described generating laser (3) is launched and the mirror-reflection that the inwall of described first L-type passage (1) vertical component is oppositely arranged, make a wordline laser beam angled project air preheater rotor measurement datum (11) and the outstanding outstanding label (6) of fanning strip (5) on present two rankings and put different wire light spot images, image acquisition device (4) gathers described two rankings by the mirror-reflection of the second L-type passage (2) interior corner and puts different wire light spot images, according to the absolute position of described two winding displacement shaped laser spot images, and alternate position spike between the two, obtain the seal clearance that fanning strip (5) is relative with air preheater rotor.
8. the laser image detection method of the air preheater rotor deflection according to claim 6 or 7, it is characterized in that: described generating laser (3) is a word line laser device, described imageing sensor (4) adopts array image sensor.
9. the laser image detection method of the air preheater rotor deflection according to claim 5 or 6 or 7, it is characterized in that: measurement result is transferred to computer for controlling, the height of fanning strip (5) is regulated by the computer for controlling motor action processed by analysis in rear control topworks, make described fanning strip (5) follow the tracks of the deflection of air preheater rotor, control seal clearance and maintain all the time in the range of allowable error near setting value.
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