CN108955550A - Air preheater arc panel and rotor clearance visual measuring device and its measurement method - Google Patents
Air preheater arc panel and rotor clearance visual measuring device and its measurement method Download PDFInfo
- Publication number
- CN108955550A CN108955550A CN201810563009.1A CN201810563009A CN108955550A CN 108955550 A CN108955550 A CN 108955550A CN 201810563009 A CN201810563009 A CN 201810563009A CN 108955550 A CN108955550 A CN 108955550A
- Authority
- CN
- China
- Prior art keywords
- rotor
- arc panel
- measuring device
- laser
- visual measuring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses air preheater arc panel and rotor clearance visual measuring device and its measurement method, visual measuring devices, including the video acquisition unit and light filling mechanism being arranged in mounting body；Visualization measurement method is determined using preceding each advanced rower of visual measuring device, finds the corresponding relationship between displacement increment and pixel increment；Visual measuring device is installed well when use, the dual laser image of target area is obtained by video camera, it is conveyed to image processor, the gap width that processing obtains is fed back to video-frequency monitor by image processor, gap size is seen in real time, when gap size exceeds normal range (NR), system automatic alarm prompt, so that operator carries out arc Board position adjustment according to monitoring screen in time；The present invention can observe gap picture and gap size information in real time, greatly facilitate accurate adjustment of the operator to air preheater arc panel and rotor side surface gap, improve the operational efficiency of unit, and maintenance, replacement are convenient.
Description
Technical field
The invention belongs to video monitorings and technical field of visual measurement, for the object gap under parallel lines laser irradiation
Vision measurement.More particularly to air preheater arc panel and rotor clearance visual measuring device and its measurement method.
Background technique
" rotary regenerative air preheater " is one of the major pant item of large scale industry boiler in fired power generating unit, referred to as " empty pre-
Device ".Air preheater at work, " mushroom " deformation can be generated since upper and lower uneven heating is even, and with boiler workload
Different distortion amount is constantly changing, i.e., the gap between the arc panel and rotor of air preheater is a variable quantity.The presence in gap will
So that a large amount of hot-air is leaked to flue, increases blower power consumption；Hot-air takes away a large amount of thermal energy simultaneously, directly results in boiler
The thermal efficiency reduces.Therefore the arc panel of preheater should be as small as possible with rotor clearance, but with the reduction in gap, rotor operating
Resistance increases, and it is stuck to occur rotor when too small, and such accident generation then needs hot adjusting preheater arc in order to prevent
Gap between plate and rotor.But since the internal temperature of air preheater reaches 350~450 DEG C, and containing a large amount of dust and
Corrosive substance brings challenges to the design and installation of sensor, causes to generally use the reserved mode of design in current engineering,
I.e. cold conditions when technical staff according to design preset clearance, arc panel is adjusted to certain position, it is hot no longer to adjust.This scheme is led
It causes often to occur due to preset clearance deficiency, in hot high load capacity, rotor resistance is excessive, leads to air preheater driving overload, even
Rotor is stuck.If can not only be detected, and can in the form of images real-time display air preheater arc panel with
Rotor clearance necessarily can be convenient the hot adjustment arc panel of operator to suitable position, avoid the stuck problem of rotor, improve machine
The operational safety and efficiency of group.
Summary of the invention
The purpose of the present invention is to provide air preheater arc panels and rotor clearance visual measuring device and its measurement
Method, solving adjusting arc panel in the prior art can not survey with rotor clearance, is invisible, relies on experience merely, causes gap big
Since the rotor mushroom deformation that is heated causes fanning strip that cannot transfer in place when small bad or even hot, cause to leak out bigger than normal, greatly
Big reduction unit working efficiency or rotor and arc panel are stuck, and air preheater driving motor overload, unit chaser seriously affects
The problem of unit safety working efficiency.Visualizing monitor scheme is provided reliably to adjust air preheater arc Board position.
To achieve the above object the invention adopts the following technical scheme:
Air preheater arc panel and rotor clearance visual measuring device, the video including being arranged in mounting body are adopted
Collect unit and light filling mechanism；Video acquisition unit and light filling mechanism include the video camera and two-wire being mounted on the outside of equipment mounting base
Laser light source, and it is mounted on lengthening camera lens on the inside of equipment mounting base and dual laser pipeline and a word laser head；Video camera
It is correspondingly arranged and is connected to lengthening camera lens, dual laser light source, dual laser pipeline and a word laser head are correspondingly arranged connection；Two-wire
The three hole pipeline configurations of one that laser pipeline and lengthening camera lens are made as axis parallel are triple channel；While equipment mounting base
Outside is equipped with equipment protection shell, and video camera and dual laser light source are enclosed in equipment protection shell chamber；Equipment protection shell simultaneously
It is provided with fine tuning jackscrew and positioning ring is correspondingly connected with video camera and dual laser light source respectively, finely tune jackscrew and positioning ring difference
Position for correcting camera and dual laser light source；Cable interface, video camera and two-wire are equipped on equipment protection shell simultaneously
The cable of laser light source is connect by cable interface with image processor, for video camera and line laser light source power supply and carrying out
Communication；
The structure of mounting body includes high temperature dwell protective case, and high temperature dwell protective case is equipped with ball valve close to external port, close to ball valve
Peripheral circumferential on be provided with mounting flange, mounting flange is used to connect with the flange of equipment mounting base installation side counterpart；High temperature
Protective shell end is equipped with external screw thread, there is the air blowing of input compressed gas on the high temperature dwell protective case shell between ball valve and mounting flange
Mouthful, periodically for reducing the temperature for lengthening camera lens and dual laser pipeline and soot blowing is carried out from inflatable mouth input compressed gas.
Preferably, lengthening camera lens, dual laser pipeline and a word laser head is heat-resisting material, is able to bear 800 DEG C
High temperature.
A kind of assembly and disassembly methods of air preheater arc panel and rotor clearance visual measuring device, include the following steps:
When installing apparatus of the present invention on air preheater, the corresponding arc panel center position on the upper side of rotor below fanning strip,
Visual measuring device is installed in aperture, is about 300mm apart from fanning strip lower edge, the end of visual measuring device cannot exceed
Arc panel curved surface, away from cambered surface surface 5mm；Arc panel is connect with furnace wall by expansion tube simultaneously, and connection type is flanged joint, root
It is scalable according to furnace wall, arc panel hot shaping expansion tube；There are internal screw thread, high temperature in the mounting flange end that expansion tube is connect with arc panel
Protective shell is inserted into across expansion tube, is inserted into bottom end and is screwed high temperature dwell protective case, so that external screw thread and expansion on high temperature dwell protective case
The connection of pipe end mounting flange internal screw thread, high temperature dwell protective case is reliably fixed, according to the installation of visual measuring device and rotor
Distance is screwed in or is screwed out；The end of triple channel is towards between the detection between the corresponding rotor in furnace wall and arc panel
Gap；At this time by adjusting fine tuning jackscrew, the field range of video camera is set to cover dual laser, then double by positioning ring adjusting
Linear laser source position makes laser rays perpendicular to rotor side surface；After the completion of to be regulated, equipment mounting base is connect with mounting flange, is made
It obtains video acquisition mechanism and the installation of light filling mechanism is reliable, start to detect work；
When needing to carry out dual laser pipeline and camera apparatus maintenance or cleaning, equipment mounting base and fixation are dismantled
Blue connection, equipment mounting base and triple channel are transferred to from high temperature dwell protective case inner cavity together, when leaving ball valve wait extract part,
Need manually to close ball valve, so that it is guaranteed that furnace high-temperature gas does not overflow, open protective shell carry out maintenance of equipment or
Person's cleaning；
When installing again after the completion of dual laser pipeline or camera apparatus maintenance, ball valve is first opened manually, by three
Channel is slowly advanced in high temperature dwell protective case, shifts bottom onto always, and mounting base and mounting flange are reliably locked installation at this time, i.e., complete
At cleaning or replacement；
It is measured, is specifically comprised the following steps: using visual measuring device described in right
Step 1, each visual measuring device find displacement increment and pixel increment using preceding needing advanced rower fixed
Corresponding relationship；Specific calibration process is: placing the plate vertical with laser rays before visual measuring device, selects different
Position, record position hmmWith laser rays pel spacing hpix, so that the corresponding relationship of the two is obtained, by the multiple of positive revesal
Experiment, acquires the average value k of coefficient k as calibration coefficient；
Step 2 installs visual measuring device well, passes through video camera and obtains target area dual laser image, protects
Two parallel laser camber lines are demonstrate,proved within the scope of whole visual field, n slab region is divided the image into according to rotor epipleural distributing position
Domain, each region extracts two parallel laser bank lines in the region using Hough transformation, and calculates camber line spacing, chooses n
The maximum laser line spacing in a region, is converted to actual distance value according to calibrating parameters, as arc panel and rotor clearance value；
Step 3, video acquisition system are conveyed to image processor under the cooperation of light compensating lamp, by the picture signal of target,
The gap width that processing obtains is fed back to video-frequency monitor by image processor, and to see gap size in real time, gap changes, when
When gap size exceeds normal range (NR), system automatic alarm prompt, so that operator carries out arc according to monitoring screen in time
Board position adjustment.
It is preferred: in the step 1, video camera being demarcated, displacement increment and pixel increment are obtained according to formula (1)
Corresponding relationship:
According to formula (2) coefficient k average value:
It is preferred: step 2 detailed process:
2.1) camera pose adjustment
When visual measuring device is installed, by positioning ring adjust setting angle, make as far as possible laser rays perpendicular to turn
Sub- side, and locking positioning ring is fixed；By image procossing, detect two laser rays whether horizontal parallel, if there is inclination angle,
Carrying out image rotation correction keeps two laser rays horizontal in the picture；
2.2) air preheater arc panel and rotor side surface gap are calculated
Region of interest regional partition is carried out to image first, takes picture centre lower regions, two laser rays are covered, then
Piecemeal processing is carried out according to rotor epipleural distributing position, extracts two from image in parallel using Hough transformation to each piece
Laser rays camber line, and calculate camber line spacing h in all piecespix, compare to obtain maximum spacing hmax, according to the transformation of step 1 calibration
The available practical spacing h of coefficient；
After visual measuring device installation fixes, the h of storage record at this time, as initial zero position Hzero；In when
H when rotor rotation, thermal deformation or adjustment arc panelmaxChange therewith, actual gap h also changes simultaneously, and then is calculated opposite
The increments of change △ h of initial zero position, convenient for monitoring the variation of rotor and arc sheet separation.
It is preferred: actual gap is calculated according to formula (3) in the step 2.2):
The increments of change △ h of opposite initial zero position, calculation formula are calculated according to formula (4) are as follows:
△ h=h-Hzero (4)。
Compared with prior art, the invention has the following advantages that projecting two parallel laser rays to sky by light compensating lamp
Pre- device rotor side surface forms two parallel camber lines in side, using the video of camera acquisition corresponding position, according to rotor epipleural
Distributing position carries out piecemeal processing, and the arc installed on furnace wall below air preheater rotor side surface and fanning strip is obtained using Hough transformation
The distance between shape plate, Real-time Feedback are simultaneously shown in monitored picture, realize the real-time measurement and monitoring warning function in gap, specifically
Including following aspect:
1) present invention firstly provides air preheater arc panels and rotor clearance visual measuring device and method, using view
Frequency processing technique can observe gap picture and gap size information in real time, greatly facilitate operator to air preheater arc
The accurate adjustment of plate and rotor side surface gap, improves the operational efficiency of unit.
2) measurement method of the present invention and device are non-contact measurement, mechanical wear problem are not present, measurement effect can
Stable for extended periods of time.
3) all detection electronic components are mounted on outside air preheater, hot can be replaced, and are safeguarded, are replaced conveniently.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of visual measuring device of the present invention；
Fig. 2 is visual measuring device of the present invention schematic view of the mounting position on air preheater；
Fig. 3 is the gap detection flow chart of visual measuring device measurement method of the present invention；
Fig. 4 is interesting image regions and piecemeal schematic diagram.
In figure, 1. image processors；2. cable interface；3. video camera；4. dual laser light source；5. finely tuning jackscrew；6. fixed
Position ring；7. equipment protection shell；8. equipment mounting base；9. ball valve；10. inflatable mouth；11. line double excitation pipeline；12. mounting flange；
13. lengthening camera lens；14. laser optical path；15. a word laser head；16. high temperature dwell protective case；17. external screw thread；18. triple channel；19. can
Depending on changing measuring device；20. rotor；21. arc panel；22. furnace wall；23. detector gap；24. expansion tube；25. fanning strip；26. side
Plate；27. parallel laser camber line.
Specific embodiment
The present invention is further elaborated in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, air preheater arc panel and rotor clearance visual measuring device, including be arranged in mounting body
On video acquisition unit and light filling mechanism；Video acquisition unit and light filling mechanism include being mounted on 8 outside of equipment mounting base
Video camera 3 and dual laser light source 4, and it is mounted on the lengthening camera lens 13 and dual laser pipeline 11 of 8 inside of equipment mounting base
An and word laser head 15；Video camera 3 is correspondingly arranged and is connected to camera lens 13 is lengthened, dual laser light source 4, dual laser pipeline 11 and
One word laser head 15 is correspondingly arranged connection；The inner cavity of dual laser pipeline 11 be laser optical path 14, dual laser pipeline 11 with plus
The three hole pipeline configurations of one that full length shot 13 is made as axis parallel are triple channel 18；The outside peace of equipment mounting base 8 simultaneously
Equipped with equipment protection shell 7, video camera 3 and dual laser light source 4 are enclosed in 7 chamber of equipment protection shell；Equipment protection shell 7 is set simultaneously
It is equipped with fine tuning jackscrew 5 and positioning ring 6 is correspondingly connected with video camera 3 and dual laser light source 4 respectively, finely tune jackscrew 5 and positioning ring 6
It is respectively used to the position of correcting camera 3 Yu dual laser light source 4；Cable interface 2, camera shooting are equipped on equipment protection shell 7 simultaneously
The cable of machine 3 and dual laser light source 4 is connect by cable interface 2 with image processor 1, for video camera 3 and line laser
Light source 4 is powered and is communicated；Lengthening camera lens 13, dual laser pipeline 11 and a word laser head 15 is heat-resisting material, energy
Enough bear 800 DEG C of high temperature.
The structure of mounting body includes high temperature dwell protective case 16, and high temperature dwell protective case 16 is equipped with ball valve 9 close to external port, is approached
Mounting flange 12 is provided in the peripheral circumferential of ball valve 9, mounting flange 12 is used to install side counterpart with the flange of equipment mounting base 8
Connection；16 end of high temperature dwell protective case is equipped with external screw thread 17 for connecting with 24 end flange internal screw thread of expansion tube；Ball valve 9 and fixation
There is the inflatable mouth 10 of input compressed gas on 16 shell of high temperature dwell protective case between flange 12, periodically inputs compressed gas from inflatable mouth 10
Body is for reducing the temperature for lengthening camera lens 13 and dual laser pipeline 11 and carries out soot blowing.
Above structure of the present invention is collectively referred to as visual measuring device 19.
As shown in Fig. 2, a kind of assembly and disassembly methods of air preheater arc panel and rotor clearance visual measuring device, including
Following steps:
When installing apparatus of the present invention on air preheater, corresponding 21 center of arc panel of rotor 20 is on the upper side below fanning strip 25
Visual measuring device 19 is installed in position, aperture, is about 300mm or so, visual measuring device apart from 25 lower edge of fanning strip
19 end cannot exceed 21 curved surface of arc panel, away from cambered surface surface 5mm or so；Arc panel 21 and furnace wall 22 pass through expansion tube simultaneously
24 connections, connection type is flanged joint, can be stretched according to furnace wall 22,21 hot shaping expansion tube 24 of arc panel；Expansion tube
There is internal screw thread at the 24 mounting flange ends connecting with arc panel 21, and high temperature dwell protective case 16 is inserted into across expansion tube 24, are inserted into bottom end
High temperature dwell protective case 16 is screwed, so that the external screw thread 17 on high temperature dwell protective case 16 and 24 end mounting flange internal screw thread of expansion tube connect
It connects, high temperature dwell protective case is reliably fixed, can be revolved according to visual measuring device 19 and the mounting distance of rotor 20
Enter or screws out；The end of triple channel 18 is towards the detector gap 23 between the corresponding rotor 20 in furnace wall 22 and arc panel 21；This
When by adjusting fine tuning jackscrew 5, so that the field range of video camera 3 is covered dual laser, then adjust two-wire by positioning ring 6
4 position of laser source makes laser rays perpendicular to 20 side of rotor；After the completion of to be regulated, equipment mounting base 8 and mounting flange 12 are connected
It connects, so that video acquisition mechanism and the installation of light filling mechanism are reliable, can start to detect work.
When needing to carry out dual laser pipeline 11 and 3 maintenance of equipment of video camera or cleaning, dismantles equipment mounting base 8 and consolidate
The connection for determining flange 12 is transferred to equipment mounting base 8 and triple channel 18, part to be extracted from 16 inner cavity of high temperature dwell protective case together
It when leaving ball valve 9, needs manually to close ball valve, so that it is guaranteed that furnace high-temperature gas does not overflow, guarantee in disassembly process absolutely
To safety；It can carry out opening the progress maintenance of equipment of protective shell 7 or cleaning at this time；
When installing again after the completion of dual laser pipeline 11 or 3 maintenance of equipment of video camera, ball valve 9 is first opened manually,
Triple channel 18 is slowly advanced in high temperature dwell protective case 16, shifts bottom onto always, at this time reliably locks mounting base 8 and mounting flange 12
Cleaning or replacement are completed in tight installation；
The method measured using the visual measuring device, is specifically comprised the following steps:
Step 1, each visual measuring device find displacement increment and pixel increment using preceding needing advanced rower fixed
Corresponding relationship；Specific calibration process is: placing the plate vertical with laser rays before visual measuring device, selects different
Position (such as interval 5mm-150mm 5mm takes a point), record position hmmWith laser rays pel spacing hpixBoth, thus obtain
Corresponding relationship acquires the average value k of coefficient k as calibration coefficient by many experiments of positive revesal；
Displacement increment and pixel increment corresponding relationship are obtained according to formula (1):
According to formula (2) coefficient k average value:
Step 2 installs visual measuring device well, passes through video camera 3 and obtains target area dual laser image, protects
Two parallel laser camber lines 27 are demonstrate,proved within the scope of whole visual field, divide the image into n according to 20 epipleural of rotor, 26 distributing position
Bar-shaped zone, each region extract two parallel laser bank lines 27 in the region using Hough transformation, and calculate between camber line
Away from the maximum laser line spacing in n region of selection is converted to actual distance value according to calibrating parameters, as arc panel and turns
Sub- gap width；Calculation process is as shown in Figure 3；
Step 2 detailed process:
2.1) camera pose adjustment
When visual measuring device is installed, by positioning ring 6 adjust setting angle, make as far as possible laser rays perpendicular to turn
Sub- side, and locking positioning ring is fixed；By image procossing, detect two laser rays whether horizontal parallel, if there is inclination angle,
Carrying out image rotation correction keeps two laser rays horizontal in the picture；
2.2) air preheater arc panel and rotor side surface gap are calculated
Region of interest regional partition is carried out to image first, takes picture centre lower regions, two laser rays are covered, then
Piecemeal processing is carried out according to 20 epipleural of rotor, 26 distributing position, such as Fig. 4 extracts each piece using Hough transformation from image
Two parallel laser bank lines 27 out, and calculate camber line spacing h in all piecespix, compare to obtain maximum spacing hmax, according to step
The available practical spacing h of transformation coefficient of 1 calibration；Calculation formula such as following formula (3):
After visual measuring device installation fixes, the h of storage record at this time, as initial zero position Hzero；In when
H when rotor rotation, thermal deformation or adjustment arc panelmaxChange therewith, actual gap h also changes simultaneously, and then is calculated opposite
The increments of change △ h of initial zero position, convenient for monitoring the variation of rotor and arc sheet separation.It is calculated relatively according to formula (4)
The increments of change △ h of initial zero position, calculation formula are as follows:
△ h=h-Hzero (4)。
Step 3, video acquisition system are conveyed to image processor under the cooperation of light compensating lamp, by the picture signal of target,
The gap width that processing obtains is fed back to video-frequency monitor by image processor, and to see gap size in real time, gap changes, when
When gap size exceeds normal range (NR), system automatic alarm prompt, so that operator carries out arc according to monitoring screen in time
Board position adjustment.
Present invention firstly provides air preheater arc panels and rotor clearance visual measuring device and method, including to taking the photograph
Camera 3 and the design and dual laser light source 4, dual laser pipeline 11 and " word " laser head 15 for lengthening camera lens 13
Design；Visual measuring device 19 is using the preceding corresponding relationship for carrying out calibration first and obtaining displacement increment and pixel increment；Make
Used time obtains target area parallel laser camber line image by video camera 3, according to 20 epipleural of rotor, 26 distributing position by image
It is divided into n bar-shaped zone, two laser rays camber lines in each region are extracted by Hough transformation and calculates camber line spacing, compares
To maximum spacing, it is converted to gap between arc panel and rotor according to calibrating parameters, and calculate increments of change, greatly reduces detection
Error；Compared with existing gap approaches, the cost easy for installation greatly reduced observes gap picture and gap size in real time
Information, actual gap range in time alarm to gap abnormality in 0~150mm or more.
The above is present pre-ferred embodiments, for the ordinary skill in the art, according to the present invention
Introduction, in the case where not departing from the principle of the present invention and spirit, changes, modifications, replacement and change that embodiment is carried out
Type is still fallen within protection scope of the present invention.
Claims (7)
1. air preheater arc panel and rotor clearance visual measuring device, which is characterized in that including being arranged in mounting body
On video acquisition unit and light filling mechanism；Video acquisition unit and light filling mechanism include being mounted on taking the photograph on the outside of equipment mounting base
Camera and dual laser light source, and it is mounted on lengthening camera lens on the inside of equipment mounting base and dual laser pipeline and a word laser
Head；Video camera is correspondingly arranged with lengthening camera lens and is connected to, and dual laser light source, dual laser pipeline and a word laser head are correspondingly arranged
Connection；The three hole pipeline configurations of one that dual laser pipeline and lengthening camera lens are made as axis parallel are triple channel；It sets simultaneously
Equipment protection shell is installed, video camera and dual laser light source are enclosed in equipment protection shell chamber on the outside of standby mounting base；Simultaneously
Equipment protection shell be provided with fine tuning jackscrew and positioning ring be correspondingly connected with respectively with video camera and dual laser light source, fine tuning jackscrew and
Positioning ring is respectively used to the position of correcting camera Yu dual laser light source；Cable interface is equipped on equipment protection shell simultaneously, is taken the photograph
The cable of camera and dual laser light source is connect by cable interface with image processor, for video camera and line laser light source
It powers and is communicated；
The structure of mounting body includes high temperature dwell protective case, and high temperature dwell protective case is equipped with ball valve close to external port, close to the outer of ball valve
Enclose it is provided circumferentially about have a mounting flange, mounting flange is used to connect with the flange of equipment mounting base installation side counterpart；High temperature protection
Shell end is equipped with external screw thread, there is the inflatable mouth of input compressed gas on the high temperature dwell protective case shell between ball valve and mounting flange, fixed
Phase for reducing the temperature for lengthening camera lens and dual laser pipeline and carries out soot blowing from inflatable mouth input compressed gas.
2. air preheater arc panel according to claim 1 and rotor clearance visual measuring device, which is characterized in that
Lengthening camera lens, dual laser pipeline and a word laser head is heat-resisting material, is able to bear 800 DEG C of high temperature.
3. a kind of assembly and disassembly methods of air preheater arc panel and rotor clearance visual measuring device, which is characterized in that including
Following steps:
When installing apparatus of the present invention on air preheater, the corresponding arc panel center position on the upper side of rotor, aperture below fanning strip
Visual measuring device is installed, is about 300mm apart from fanning strip lower edge, the end of visual measuring device cannot exceed arc
Plate curved surface, away from cambered surface surface 5mm；Arc panel is connect with furnace wall by expansion tube simultaneously, and connection type is flanged joint, according to furnace
Wall, arc panel hot shaping expansion tube are scalable；There are internal screw thread, high temperature protection in the mounting flange end that expansion tube is connect with arc panel
Shell is inserted into across expansion tube, is inserted into bottom end and is screwed high temperature dwell protective case, so that the external screw thread on high temperature dwell protective case and expansion tube end
The connection of mounting flange internal screw thread is held, high temperature dwell protective case is reliably fixed, according to the mounting distance of visual measuring device and rotor
It is screwed in or is screwed out；The end of triple channel is towards the detector gap between the corresponding rotor in furnace wall and arc panel；This
When by adjusting fine tuning jackscrew, so that the field range of video camera is covered dual laser, then by positioning ring to adjust two-wire sharp
Light source position makes laser rays perpendicular to rotor side surface；After the completion of to be regulated, equipment mounting base is connect with mounting flange, so that view
Frequency collecting mechanism and the installation of light filling mechanism are reliable, start to detect work；
When needing to carry out dual laser pipeline and camera apparatus maintenance or cleaning, equipment mounting base and mounting flange are dismantled
Connection, equipment mounting base and triple channel are transferred to from high temperature dwell protective case inner cavity together, when leaving ball valve wait extract part, are needed
Ball valve is closed manually, so that it is guaranteed that furnace high-temperature gas does not overflow, carries out opening protective shell progress maintenance of equipment or clear
It is clean；
When installing again after the completion of dual laser pipeline or camera apparatus maintenance, ball valve is first opened manually, by triple channel
It is slowly advanced in high temperature dwell protective case, shifts bottom onto always, mounting base and mounting flange are reliably locked into installation at this time, that is, complete clear
Clean or replacement.
4. a kind of air preheater arc panel and rotor clearance visualization measurement method, which is characterized in that utilize claim 1-2
Any visual measuring device measures, and specifically comprises the following steps:
Step 1, each visual measuring device find pair of displacement increment and pixel increment using preceding needing advanced rower fixed
It should be related to；Specific calibration process is: placing the plate vertical with laser rays before visual measuring device, selects different positions
It sets, record position hmmWith laser rays pel spacing hpix, so that the corresponding relationship of the two is obtained, by the multiple reality of positive revesal
It tests, acquires the average value k of coefficient k as calibration coefficient；
Step 2 installs visual measuring device well, passes through video camera and obtains target area dual laser image, guarantees two
Parallel laser camber line divides the image into n bar-shaped zone according to rotor epipleural distributing position, often within the scope of whole visual field
A region extracts two parallel laser bank lines in the region using Hough transformation, and calculates camber line spacing, chooses n region
Maximum laser line spacing, actual distance value is converted to according to calibrating parameters, as arc panel and rotor clearance value；
Step 3, video acquisition system are conveyed to image processor, image under the cooperation of light compensating lamp, by the picture signal of target
The gap width that processing obtains is fed back to video-frequency monitor by processor, and to see gap size in real time, gap is worked as in gap variation
When size exceeds normal range (NR), system automatic alarm prompt, so that operator carries out arc panel position according to monitoring screen in time
Set adjustment.
5. air preheater arc panel according to claim 4 and rotor clearance visualization measurement method, it is characterised in that:
In the step 1, video camera is demarcated, displacement increment and pixel increment corresponding relationship are obtained according to formula (1):
According to formula (2) coefficient k average value:
6. air preheater arc panel according to claim 4 and rotor clearance visualization measurement method, it is characterised in that:
Step 2 detailed process:
2.1) camera pose adjustment
When visual measuring device is installed, setting angle is adjusted by positioning ring, makes laser rays perpendicular to rotor-side as far as possible
Face, and locking positioning ring is fixed；By image procossing, detecting two laser rays, whether horizontal parallel is carried out if there is inclination angle
Image rotation correction keeps two laser rays horizontal in the picture；
2.2) air preheater arc panel and rotor side surface gap are calculated
Region of interest regional partition is carried out to image first, takes picture centre lower regions, two laser rays are covered, then basis
Rotor epipleural distributing position carries out piecemeal processing, and two parallel lasers are extracted from image using Hough transformation to each piece
Bank line, and calculate camber line spacing h in all piecespix, compare to obtain maximum spacing hmax, according to the transformation coefficient of step 1 calibration
Available practical spacing h；
After visual measuring device installation fixes, the h of storage record at this time, as initial zero position Hzero；When rotor turns in
H when dynamic, thermal deformation or adjustment arc panelmaxChange therewith, actual gap h also changes simultaneously, and then is calculated relatively initial zero
The increments of change Δ h of position, convenient for monitoring the variation of rotor and arc sheet separation.
7. air preheater arc panel according to claim 6 and rotor clearance visualization measurement method, it is characterised in that:
Actual gap is calculated according to formula (3) in the step 2.2):
The increments of change Δ h of opposite initial zero position, calculation formula are calculated according to formula (4) are as follows:
Δ h=h-Hzero (4)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810563009.1A CN108955550A (en) | 2018-06-04 | 2018-06-04 | Air preheater arc panel and rotor clearance visual measuring device and its measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810563009.1A CN108955550A (en) | 2018-06-04 | 2018-06-04 | Air preheater arc panel and rotor clearance visual measuring device and its measurement method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108955550A true CN108955550A (en) | 2018-12-07 |
Family
ID=64492722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810563009.1A Pending CN108955550A (en) | 2018-06-04 | 2018-06-04 | Air preheater arc panel and rotor clearance visual measuring device and its measurement method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108955550A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916357A (en) * | 2019-02-21 | 2019-06-21 | 西安理工大学 | Power station boiler air pre-heater gap detection method based on Multi-sensor Fusion |
| CN110375652A (en) * | 2019-08-28 | 2019-10-25 | 合肥工业大学 | The long range multiple degrees of freedom laser measurement system of beam stability can be improved |
| CN111336939A (en) * | 2020-03-13 | 2020-06-26 | 安标国家矿用产品安全标志中心有限公司 | Machine vision-based online detection method and device for gap between explosion-proof joint surfaces |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3532644B2 (en) * | 1995-02-03 | 2004-05-31 | 株式会社モリテックス | Distance measuring device |
| KR101178253B1 (en) * | 2012-02-08 | 2012-08-29 | 하나에버텍 주식회사 | Displacement measuring apparatus for air preheater |
| CN203929032U (en) * | 2014-06-30 | 2014-11-05 | 深圳东方锅炉控制有限公司 | A kind of displacement transducer of monitoring power station air preheater rotor deformation |
| CN104655039A (en) * | 2015-03-16 | 2015-05-27 | 赵佑民 | Laser image detection device and method of air pre-heater rotor deformation |
| CN104668738A (en) * | 2015-02-02 | 2015-06-03 | 南昌大学 | Cross type double-line laser vision sensing welding gun height real-time identification system and method |
| CN105091768A (en) * | 2015-06-01 | 2015-11-25 | 深圳东方锅炉控制有限公司 | Measurement apparatus and method for monitoring clearance generated by air preheater by using double laser |
| CN106871804A (en) * | 2017-01-19 | 2017-06-20 | 西安理工大学 | Air-heater leakage gap vision measurement and visualization device and method |
| CN107328368A (en) * | 2017-06-30 | 2017-11-07 | 中机国际工程设计研究院有限责任公司 | Gap measurement device and method, the production line using this device between stator and rotor |
-
2018
- 2018-06-04 CN CN201810563009.1A patent/CN108955550A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3532644B2 (en) * | 1995-02-03 | 2004-05-31 | 株式会社モリテックス | Distance measuring device |
| KR101178253B1 (en) * | 2012-02-08 | 2012-08-29 | 하나에버텍 주식회사 | Displacement measuring apparatus for air preheater |
| CN203929032U (en) * | 2014-06-30 | 2014-11-05 | 深圳东方锅炉控制有限公司 | A kind of displacement transducer of monitoring power station air preheater rotor deformation |
| CN104668738A (en) * | 2015-02-02 | 2015-06-03 | 南昌大学 | Cross type double-line laser vision sensing welding gun height real-time identification system and method |
| CN104655039A (en) * | 2015-03-16 | 2015-05-27 | 赵佑民 | Laser image detection device and method of air pre-heater rotor deformation |
| CN105091768A (en) * | 2015-06-01 | 2015-11-25 | 深圳东方锅炉控制有限公司 | Measurement apparatus and method for monitoring clearance generated by air preheater by using double laser |
| CN106871804A (en) * | 2017-01-19 | 2017-06-20 | 西安理工大学 | Air-heater leakage gap vision measurement and visualization device and method |
| CN107328368A (en) * | 2017-06-30 | 2017-11-07 | 中机国际工程设计研究院有限责任公司 | Gap measurement device and method, the production line using this device between stator and rotor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916357A (en) * | 2019-02-21 | 2019-06-21 | 西安理工大学 | Power station boiler air pre-heater gap detection method based on Multi-sensor Fusion |
| CN109916357B (en) * | 2019-02-21 | 2020-10-27 | 西安理工大学 | Power station boiler air preheater gap detection method based on multi-sensor fusion |
| CN110375652A (en) * | 2019-08-28 | 2019-10-25 | 合肥工业大学 | The long range multiple degrees of freedom laser measurement system of beam stability can be improved |
| CN111336939A (en) * | 2020-03-13 | 2020-06-26 | 安标国家矿用产品安全标志中心有限公司 | Machine vision-based online detection method and device for gap between explosion-proof joint surfaces |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108955550A (en) | Air preheater arc panel and rotor clearance visual measuring device and its measurement method | |
| CN109632103B (en) | High-altitude building temperature distribution and surface crack remote monitoring system and monitoring method | |
| CN106247308B (en) | Boiler scaling condition monitoring based on furnace exit temperature and control method | |
| CN108917205B (en) | System and method for thermal-mechanical monitoring of solar receivers | |
| KR102148437B1 (en) | A Health monitoring system for inner of wind turbine blade | |
| WO2015109857A1 (en) | Temperature detection system for molten steel in converter | |
| CN110345992A (en) | A kind of burning power plant dust stratification monitoring method and device based on high-temperature infrared imaging | |
| CN106871804B (en) | Air-heater leakage gap vision measurement and visualization device and method | |
| CN110640297B (en) | Online control system and method for transient temperature of friction stir welding | |
| CN109506583A (en) | Flexible structure whole field deformation real-time measurement system | |
| CN112161989A (en) | Online monitoring and detecting system and method for LNG (liquefied Natural gas) sealed storage device | |
| US20130197855A1 (en) | Method and apparatus to determine temperature of a gas turbine engine | |
| CN104990610B (en) | A kind of mould liquid level measuring system and measuring method | |
| CN206362311U (en) | The laser detector of rotary regenerative air preheater rotor deformation | |
| CN107356200B (en) | Method and system for measuring slag falling in pulverized coal boiler based on slag block track | |
| JP2003130752A (en) | Gas leakage detector | |
| CN207007745U (en) | Visual detection equipment | |
| JPH095246A (en) | Apparatus for monitoring bonded state of rubber of tire-molding machine | |
| JP2011163594A (en) | Operation control system and operation control method of solar heat receiver | |
| CN207642452U (en) | A kind of real-time thermal imaging infrared reflow weldering system | |
| CN116294664A (en) | Industrial furnace body data monitoring device | |
| CN106017693B (en) | The On-line Measuring Method of flying dust image collecting device and Spectrum attenuation coefficient and scattering albedo in station boiler flue | |
| CN108168475A (en) | The measuring method of transporter burner inner liner shaped air film hole Special angle | |
| CN110966984A (en) | Furnace nose level monitoring system and method based on visual images | |
| CN217586172U (en) | Quick leak detection device for water-cooled wall in soot blower area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181207 |
|
| RJ01 | Rejection of invention patent application after publication |