CN205262424U - Volumetric detection mechanism in partial rank in circular cross section gas flow standard device - Google Patents
Volumetric detection mechanism in partial rank in circular cross section gas flow standard device Download PDFInfo
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- CN205262424U CN205262424U CN201520857917.3U CN201520857917U CN205262424U CN 205262424 U CN205262424 U CN 205262424U CN 201520857917 U CN201520857917 U CN 201520857917U CN 205262424 U CN205262424 U CN 205262424U
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Abstract
The utility model relates to a volumetric detection mechanism in partial rank in circular cross section gas flow standard device, including the support, the vertical movement mechanism that reciprocates can be carried out in fixed setting on the support, and vertical movement mechanism upper portion is equipped with rotary mechanism, and rotary mechanism provides drive power by rotatory servo motor, drives the rotation measurement arm and rotates, and rotation measurement arm both ends are equipped with a pneumatic contact length gauge respectively, the gauge head of length gauge pops out, the internal wall of contact cover to measure the chord length in cover body cross -section, the rotation measurement arm rotates the X angle, and contact length gauge gauge head pops out once more, and another chord length in cover body cross -section is measured to the internal wall of contact cover, until rotating a week, measures a 360X chord length, control system calculates cover body cross sectional area in view of the above, the distance that the vertical removal of vertical movement mechanism was set for to according to difference cover body cross sectional area and vertical movement mechanism's displacement, calculate the effectively branch rank volume of the section of measurement of bell jar formula gas flow standard device.
Description
Technical field
A kind of detection machine to the inner sublevel volume of circular cross-section gas flow standard device of the utility modelStructure, belongs to bell jar volume accuracy detection technical field.
Background technology
Bell-jar gas flow standard equipment is the capital equipment of marked gas flowmeter, is also low pressure modelEnclose the disjunction mark standard apparatus of interior gas flow, the original mark by measurement technology mechanism of various countries as flow measurementAccurate. As the primary standard being achieved according to flow basic definition, can value accurately be traceable to lengthThe fundamental quantities such as degree, time, can key depends on measure bell jar volume exactly. Because bell jar is by upperTo under the gas of discharge section volume step by step, thereby the key of calibrating bell jar volume is that it is effectively measuredThe volumetric measurement of Duan Jinhang sublevel.
Existing measuring method mainly contains volumetric method and dimensional metrology. Volumetric method is by putting with gas drainingThe method of changing is measured the volume of bell jar inside, because water constantly evaporates, is difficult to control water temperature and temperature and reachesTo consistent, thereby this method is difficult to obtain desirable result. For bell jar more than 500L, sizeMensuration directly and accurately, by many measurement technologies mechanism is in the world recommended.
China National Measuring Science Research Inst. will develop the 1000L that uncertainty is less than 0.1% end of the year 2006Bell-jar gas flow standard equipment. The application such as Wang Chi π chi method, laser tracing and outside micrometerMethod, measures the external diameter on bell jar different cross section respectively. Cui Li water analysis these three kinds of methodsProduce the reason of difference, use method and the displacement method of ultrasonic thickness measurement to test, on this basis,Use length measuring instrument directly to measure the internal capacity of cover body.
Because the accuracy of form and position of cover body itself is high, the internal capacity of bell jar Exhaust Gas volume and cover body is straightConnect association, thereby between the outside diameter measuring method such as π chi method, laser tracing and outside micrometer method belongs toConnect measurement, must be in conjunction with wall thickness measuring, thereby can introduce larger uncertainty of measurement (0.02% left and right);Consider the work characteristics of bell-jar gas flow standard equipment, what need acquisition is that cover body is through anyThe normal air volume that the whole story, discharged position, is subject to axially and radial dimension limits, and general length is surveyedMeasuring appratus is difficult to record sublevel volume by the working method of cover body, and the cross section of bell jar can not be oneProper circle, introduces uncertainty of measurement with circle for the computational methods of face; Even if the circle in cross sectionSpend finely, the rotary main shaft of length-measuring appliance also cannot be placed in cover body center exactly.
To sum up, it is larger that existing dimensional metrology is measured difficulty, and uncertainty of measurement is higher, how to carryFor a kind of high precision measuring instrument and survey of measuring the inner sublevel volume of bell-jar gas flow standard equipmentMetering method is a technical barrier of this area.
Utility model content
The utility model technical issues that need to address are: prior art adopts dimensional metrology to measure clockThe difficulty of the internal capacity of bell-type gas flow standard device is larger, and uncertainty of measurement is higher howA kind of high precision measuring instrument and measurement of measuring the inner sublevel volume of bell-jar gas flow standard is providedMethod is a technical barrier of this area.
The utility model is taked following technical scheme:
A measurement mechanism for the inner sublevel volume of high accuracy bell-jar gas flow standard equipment, comprisesSupport 2, is fixedly installed the longitudinal moving mechanism that can move up and down on described support 2, described longitudinalTravel mechanism top is provided with rotating mechanism, and described rotating mechanism provides driving force by rotating servo motor 8,Driven rotary gage beam 4 rotates, and wheel measuring arm 4 two ends are respectively equipped with a Pneumatic contact type lengthMeter 5; Bell jar cover body fixed cover to be measured is located at the outside of described measurement mechanism, make contact length gauge 5 withThe height correspondence in cover body region to be measured; The gauge head that compressed air promotes contact length gauge 5 ejects, and connectsTouch cover body inwall, measure the chord length in cover body cross section, rotating servo motor 8 rotates X angle, contactThe gauge head of length gauge 5 ejects again, and contact cover body inwall, measures another chord length in cover body cross section, straightTo rotating one week, measure 360/X chord length; Control system calculates cover body area of section accordingly; VerticalTo the vertically mobile distance of setting of travel mechanism, again measure 360/X the chord length in another cover body cross section,Control system calculates this area of section accordingly; Control system is according to different cover body areas of section and longitudinalThe displacement of travel mechanism, calculates the sublevel of the effective metering section of bell-jar gas flow standard equipmentVolume.
By contact length gauge, (degree of accuracy ± 1 μ m) forms chord length with wheel measuring arm and surveys the utility modelMeasuring mechanism, utilizes relative measurement method and demarcates through initializing, and linear measure longimetry scope is widened to 1m left and right,Length value is traceable to national length standard; Without determining the accurate of gage beam pivot and length gaugePosition, can obtain the space coordinates of length gauge and cover body contact point, thereby determines the profile of each layer cross section;Application new algorithm (area scanning method, and combine some advantage of deviation from circular from method) calculates area of section,Grating scale and linear encoder are measured the spacing in each cover body cross section; A sublevel volume data of final formationTable. Bell-jar gas flow standard equipment according to this table interpolation, is tried to achieve the clock of decline in real workThe cover process air body accumulated amount that any whole story, discharged position.
Further, described longitudinal moving mechanism comprises ball-screw 3, linear servo-actuator 1, guide rod7, linear servo-actuator 1 drives ball-screw 3 to rotate, and ball-screw 3 drives guide rod 7 vertically to move,And then driven rotary gage beam 4 vertically moves.
Further, also comprise rotating servo control system, control turning arm by given angle rotation.
Further, also comprise stepping servo control system, control the axial equidistant step of ball-screw 3Enter.
Further, also comprise grating scale and linear encoder, accurately measure the axial of the each cross section of cover bodySpacing.
Further, also comprise the supporting seat 9 for fixing bell jar cover body.
Further, also comprise level(l)ing mechanism, described level(l)ing mechanism is positioned at supporting seat 9 and pushes upPortion, is equipped with X-Y to level(l)ing device by cover body top, and in conjunction with the guiding mechanism of boom hoisting,Cover body is laid to level, make it all the time in vertical state.
The beneficial effects of the utility model are:
1) certainty of measurement improves greatly, and bell jar uncertainty of measurement can reach below 0.06%.
2) measurement, easy to use.
3) by indirect method, in conjunction with existing mathematical tool, solved actual technical barrier,Design ingenious.
4) automatic acquisition measurement data, automaticity is high.
Brief description of the drawings
Fig. 1 is the survey of the inner sublevel volume of the utility model high accuracy bell-jar gas flow standard equipmentThe schematic diagram of amount device.
Fig. 2 is the survey of the inner sublevel volume of the utility model high accuracy bell-jar gas flow standard equipmentThe contour structures schematic diagram of amount device.
Fig. 3 is the survey of the inner sublevel volume of the utility model high accuracy bell-jar gas flow standard equipmentAmount device part-structure schematic diagram.
Fig. 4 is the partial enlarged drawing of Fig. 3.
Fig. 5 is the partial enlarged drawing of Fig. 3.
Fig. 6 is the schematic diagram that longitudinal moving mechanism vertically moves.
Fig. 7 is the schematic diagram of rotating mechanism rotation.
Fig. 8 is control system hardware block diagram.
Fig. 9 measures chord length schematic diagram.
Figure 10 is the profile point coordinate schematic diagram in a certain cross section.
Figure 11 is the measurement result of each area of section.
In figure, 1. linear servo-actuator, 2. support, 3. ball-screw, 4. wheel measuring arm, 5. gasMoving contact length gauge, 6. cylinder, 7. guide rod, 8. rotating servo motor.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is further illustrated.
Referring to Fig. 1-Fig. 7, measurement mechanism basic functional principle: cover body is divided into some cross sections verticallyLayer, measures respectively area of section and each cross section spacing, forms some elementary volume, volume elements, arranges and calculates rear shapeBecome a sublevel volume data table. Because cover body cross section is not a proper circle, measuring pieceRotary main shaft be difficult to be placed in exactly cover body center, so by measuring chord length, and bonded area is sweptRetouch method and deviation from circular from method and calculate area of section.
Measurement mechanism mainly comprises following eight parts:
Contact length gauge 5: major length measuring instrument; Wheel measuring arm 4: as contact lengthThe supporting body of meter; Rotating servo control system: control turning arm by given angle rotation; Stepping is watchedTake control system: control the axial equidistant stepping of ball-screw; Ball-screw 3: the axially driving of steppingMechanism; Grating scale and linear encoder: the axial spacing of accurately measuring the each cross section of cover body; Support 2 andSupport seat 9: load carrier; Balance and level(l)ing mechanism.
Wheel measuring arm 4 and two contact length gauges 5 form chord length measuring mechanism, are placed on rotating disk,Drive oscilaltion by ball-screw 3. As shown in Figure 3, adopt two cover servo drive systems to realize respectively:(1) gage beam equal angles rotates to obtain the multiple spot chord length in cross section, (2) gage beam successively equidistantRise, with grating scale and linear encoder (precision ± 10 μ m, read head resolution ratio is 1 μ m, range is1600mm) measure the spacing in each cross section.
The hardware of control system comprise host computer, Programmable Logic Controller (PLC), servo-driver,Servomotor, AD module, grating scale, PLC pulse converter, actuating equipment, human-computer interaction device etc.,Power-supply device and other anti-tampering xegregating units. Major Systems hardware forms as shown in Figure 8. Upper the nextMachine carries out communication by RS485 serial ports. When Hardware Design, using PLC is directly controlled servomotorTechnology, completes the control that gage beam is moved axially and rotated along cover body. Servo control system byThe compositions such as PLC, motor servo driver, servomotor, encoder. Only need send fortune by host computerThe instruction such as go, stop, returning, motion that can control survey arm.
Host computer adopts C# high level language control program, and PLC programming is used S7-200 specialSTEP7-MicroWIN programming, and between PLC, communication adopts Siemens PCAccess as OPCCommunication server, host computer procedure, passes through by real time access server then as OPC clientThe indirect control PLC of the S7-200 special PPI agreement of series.
The initialization of chord length measuring mechanism is demarcated: utilize standard calliper to carry out initially chord length measuring mechanismChange and demarcate, as shown in Figure 9, the result of demarcation is that two length gauges are at initial stroke l0,white，l0,blackUnder, the pivot of gage beam initially stretches to put apart from length gauge and is respectively L1And L2. Measurement mechanism realityIn work, what record is that length gauge is based on initial stroke (l0,whiteAnd l0,black) relative strokeΔli,whiteWith Δ li,black, L so1+Δli,whiteAnd L2+Δli,blackRespectively that gauge head and cover body contact point arriveThe distance of pivot, i.e. so-called half chord length. Can determine each cover body contact according to anglec of rotation θThe coordinate of point in plane (taking pivot as initial point), as shown in figure 10.
Calculate area of section, measure axial cross section spacing, finally form a sublevel volume data table.
When concrete enforcement:
1, first, bell jar cover body is fixed on boom hoisting to two by the steel construction arm at cover body topEnd is fixed on the straight line optical axis of two φ 40, and whole cover body can vertically be moved up and down;
2, lifting bell body, wait reaching predetermined altitude (> 1.2m) after, measurement mechanism to the greatest extent canCan be placed in the center of cover body, and fixed position. After cover body is stable, regulate the level of bell jar cover body as Fig. 2Shown in;
3, be equipped with X-Y to level(l)ing device by cover body top, and in conjunction with the reconditioner of boom hoistingStructure, lays level by cover body, makes it all the time in vertical state.
4, attempt lifting and measure cantilever, and rotation can not to guarantee measurement mechanism to be placed in the center of cover bodyTouching cover body, and height stroke > 1.2m;
5, select arbitrarily the cross section of a cover body inside, attempt measuring the chord length at this place, then will measureDevice keeps distance of same rectilinear direction fine motion, reattempts the chord length of measuring this place, and repetition is manyInferior, it is to move forward and backward in same rectilinear direction that holding device is all wanted in each fine motion, until find stringThat position that long value is the longest, this position can be similar to the diametrical position of thinking cover body cross section;
6, gage beam oscilaltion, and rotating operation, observe two length gauges do not touch cover body inWall, if there is touching, it is far away that the pivot that gage beam is described departs from cover body center, repeatedly adjust,Until step 5 and 6 meets the demands.
7, opening control power supply is logined software systems after system normal initialization, " confirms alsoEnter ".
8, connect S7-200OPC server, confirm motor, grating scale, length gauge unlatching, and justNormal response.
9, click " obtaining length gauge " and send contact order, set the anglec of rotation, number of revolutions, onWhether lift is from, motor rising number of times, then clicks " parameter monitoring ", observe various functions and just turn roundOften. Whether the lifting of gage beam is steady, and whether length gauge can touch the inwall of cover body.
10, parameters comprises: full-length, length gauge zero clearing. The anglec of rotation, number of revolutions,Climb and rising number of times, by length gauge zero clearing.
11, determine also token-based locating tab assembly face, arrange the interference of wire and eliminating apparatus, click and " openBegin to measure ", device starts to measure from bottom to top.
12, after the every rotation certain predetermined of rotating servo motor SM1 angle, suspend the scalable survey of length gaugeA, B is ejected by compressed air, contacts respectively with the inwall of cover body, record be length gauge based onThe relative stroke that it initially stretches, discharges air pressure, and scalable gauge head is retracted; Rotating servo motor SM1Rotate again equal angular, repeat above-mentioned measuring process, until complete number of revolutions (360/ default rotationAngle);
13, the linear servo-actuator SM2 segment distance (default 5mm) that rises, climb by with risingGrating scale and linear encoder that part support is rigidly connected are read, and send to after signal conversionPLC, is preserved by PC record then, after rising, and repeating step 12;
14,, according to climb and the rising number of times set, repeating step 12 and 13 completes once and surveysAmount process.
15, during measurement, can click " parameter monitoring ", data acquisition in Real Time Observation measuring processSituation.
16, " stop measuring " button and end measuring process, adjust after parameters, can continue to surveyAmount.
17, after ending to measure, can " write " necessary parameter and timestamp, " preservation " buttonMeasurement data is saved in SQL database;
18, SQL data can derive measurement initial data, comprise that two length gauges are respectively based on initial flexibleAmount l0,whiteAnd l0,blackRelative stroke Δ li,whiteWith Δ li,black, the anglec of rotation, grating scale and linearityThe step distance of encoder record etc. Form data file and treat post-processed.
19, click after " stopping measuring " button, exit software systems, after system stops action, closeClosed system power supply.
20, promote cover body, withdraw from measurement mechanism, finish this measurement.
Data processing and generation result:
1, according to initializing the datum length of demarcating, obtain two length gauges and cover body contact point formationTwo and half chord lengths, by the anglec of rotation, calculate the contact point coordinate taking gage beam pivot as initial point(Figure 10);
2, application new algorithm (area scanning method, and combine some advantage of deviation from circular from method) calculates and appointsThe anticipate area of a layer cross section;
3, according to the step height of 5mm, calculate sublevel volume, form sublevel volume data table
Sublevel volume data table
4, by each cover body area of section and be depicted as scatter diagram with the variation of axial height, as Figure 11Shown in.
Claims (7)
1. a testing agency for the inner sublevel volume of circular cross-section gas flow standard device, is characterized in that:
Comprise support (2), described support is fixedly installed the longitudinal moving mechanism that can move up and down on (2), described longitudinal moving mechanism top is provided with rotating mechanism, described rotating mechanism provides driving force by rotating servo motor (8), driven rotary gage beam (4) rotates, and wheel measuring arm (4) two ends are respectively equipped with a Pneumatic contact type length gauge (5);
Bell jar cover body fixed cover to be measured is located at the outside of measurement mechanism, makes contact length gauge (5) corresponding with the height in cover body region to be measured;
The gauge head that compressed air promotes contact length gauge (5) ejects, contact cover body inwall, measure the chord length in cover body cross section, rotating servo motor (8) rotates X angle, the gauge head of contact length gauge (5) ejects again, and contact cover body inwall, measures another chord length in cover body cross section, until rotate one week, measure 360/X chord length; Control system calculates cover body area of section accordingly; Longitudinal moving mechanism is the mobile distance of setting vertically, again measures 360/X the chord length in another cover body cross section, and control system calculates this area of section accordingly; Control system, according to the displacement of different cover body areas of section and longitudinal moving mechanism, calculates the sublevel volume of the effective metering section of bell-jar gas flow standard equipment.
2. testing agency as claimed in claim 1, it is characterized in that: described longitudinal moving mechanism comprises ball-screw (3), linear servo-actuator (1), guide rod (7), linear servo-actuator (1) drives ball-screw (3) to rotate, leading screw drives guide rod (7) vertically to move, and then driven rotary gage beam (4) vertically moves.
3. testing agency as claimed in claim 1, is characterized in that: also comprise rotating servo control system, control turning arm by given angle rotation.
4. testing agency as claimed in claim 1, is characterized in that: also comprise stepping servo control system, control the axial equidistant stepping of ball-screw (3).
5. testing agency as claimed in claim 1, is characterized in that: also comprise grating scale and linear encoder, accurately measure the axial spacing in the each cross section of cover body.
6. testing agency as claimed in claim 1, is characterized in that: also comprise the supporting seat (9) for fixing bell jar cover body.
7. testing agency as claimed in claim 6, it is characterized in that: also comprise level(l)ing mechanism, described level(l)ing mechanism is positioned at supporting seat (9) top, be equipped with X-Y to level(l)ing device by cover body top, and in conjunction with the guiding mechanism of boom hoisting, cover body is laid to level, make it all the time in vertical state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520857917.3U CN205262424U (en) | 2015-10-29 | 2015-10-29 | Volumetric detection mechanism in partial rank in circular cross section gas flow standard device |
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| CN201520857917.3U CN205262424U (en) | 2015-10-29 | 2015-10-29 | Volumetric detection mechanism in partial rank in circular cross section gas flow standard device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105387828A (en) * | 2015-10-29 | 2016-03-09 | 上海市计量测试技术研究院 | High-precision bell-type gas flow standard device inner order volume measurement device |
| CN107167053A (en) * | 2017-06-15 | 2017-09-15 | 内蒙古智牧溯源技术开发有限公司 | A kind of livestock encloses class rolling measuring device |
-
2015
- 2015-10-29 CN CN201520857917.3U patent/CN205262424U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105387828A (en) * | 2015-10-29 | 2016-03-09 | 上海市计量测试技术研究院 | High-precision bell-type gas flow standard device inner order volume measurement device |
| CN105387828B (en) * | 2015-10-29 | 2017-11-21 | 上海市计量测试技术研究院 | The measurement apparatus of sublevel volume inside high-precision bell-jar gas flow standard equipment |
| CN107167053A (en) * | 2017-06-15 | 2017-09-15 | 内蒙古智牧溯源技术开发有限公司 | A kind of livestock encloses class rolling measuring device |
| CN107167053B (en) * | 2017-06-15 | 2024-01-12 | 内蒙古智牧溯源技术开发有限公司 | Livestock enclosure rolling measurement device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160525 Termination date: 20171029 |