CN1281930C - Intellectualized channel flowmeter possessing servo tracking system and measuring method thereof - Google Patents
Intellectualized channel flowmeter possessing servo tracking system and measuring method thereof Download PDFInfo
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- CN1281930C CN1281930C CN 200410037415 CN200410037415A CN1281930C CN 1281930 C CN1281930 C CN 1281930C CN 200410037415 CN200410037415 CN 200410037415 CN 200410037415 A CN200410037415 A CN 200410037415A CN 1281930 C CN1281930 C CN 1281930C
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Abstract
The present invention relates to an intelligent channel flow meter with a servo tracking system and a measurement method thereof. A displacement detector is connected with a position which is near a velocimeter, and the velocimeter and the displacement detector are fixed to the front end of a servo tracking actuating mechanism; the servo tracking actuating mechanism is composed of a connecting push rod and a driving mechanism controlled by the servo tracking system, and the driving mechanism, a converter and a water-level meter of the servo tracking actuating mechanism are all fixed to an installation bridge frame. The converter can measure the velocity of a point position by means of the servo tracking actuating mechanism which is used for regulating a specified value from the velocimeter and a water level to be measured according to an actual water level measured by the water-level meter; then, measured signals are fed back to the converter, and channel flow is calculated by the converter. The present invention solves the problem that a flow meter in a channel can not be in a stable work state for long because of floater accumulation and floater winding in the channel, and the intelligent channel flow meter is suitable for the flow measurement of rectangular channels and trapezoidal channels for reservoirs, water conservancy projects on river channels, urban water supply, farmland irrigation, etc.
Description
Technical field
The present invention relates to a kind of canal water gauging facility and measuring method thereof, particularly a kind of canal capacity is taken into account its measuring method.
Background technology
The existing facility that is used for canal water gauging roughly can be divided into three classes: weir, flume, water-meter.
One, weir and flume: in canal capacity measured, weir commonly used had triangle weir, rectangular weir, overall with weir and Cipolletti weir etc., and flume commonly used has Bashel flume, no larynx section flume, hydraulic jump formula weight tank and parabola shaped flume; Trapezoidal flume and channel section flume etc. are abroad arranged.Water body in the channel when flowing through weir or flume, because of the resistance of weir, groove make water level in the channel on the weir, the front and back of groove produce a water level variable, according to this variable quantity, calculate corresponding flow numerical value by the relevant flow formula of hydraulics.Though above-mentioned two class canal water gauging facilities are simple in structure, cheap, exist the defective that much can't overcome:
A. dwindle effective water-carrying section of channel, reduced the diversion ability of channel.
B. convection cell produces resistance, causes the loss of flood peak.
C. before the weir, shoal materials easily behind the groove.
D. measuring accuracy is low, and the flow measurement scope is little, can't be used for big flow channel flow measurement.
Two, water-meter:
1, the water-meter that can be directly used in the channel flow measurement separately only has diving electromagnetic flowmeter a kind of, diving electromagnetic flowmeter is made cutting magnetic line movement by conductive fluid in magnetic field, with magnetic line of force direction, fluid flow direction mutually perpendicular direction on the electrode of a pair of contact liq on have electromotive force and induct.According to Faraday's electromagnetic induction law, induction electromotive force is directly proportional with the fluid mean velocity in section.Diving electromagnetic flowmeter and the electromagnetic current meter mentioned later are all according to this principle work.Diving electromagnetic flowmeter is applicable to the channel flow measurement of different shape, and the maximum nominal of making is stimulated the menstrual flow and is DN800mm at present, adopts emulation sensor (shunting model) but the range extension scope.The measuring accuracy of diving electromagnetic flowmeter is higher, single table ± 1.5%; Be ± 2.5% when share with the emulation sensor.When using the diving electromagnetic flowmeter flow measurement, should be chosen in that canal cross section is even, current are steady, straight length is provided with flashboard on the position of channel width more than five times.Flow sensor is installed on the flashboard, will guarantee during installation that sensor all slips into the underwater.According to the mounting means of diving electromagnetic flowmeter we just can be clear and definite cognition, compare with flume with weir, it is higher that diving electromagnetic flowmeter removes measuring accuracy.But other defective of weir, groove does not improve, because the bore of diving electromagnetic flowmeter is less, the probability that is stopped up by the water float thing during flow measurement is on the contrary than the increase of weir, groove.Therefore, diving electromagnetic flowmeter does not have too big advantage in the big flow flow measurement of channel.
2, flow velocity-water level operation method flowmeter: in channel flow velocity-area-method flow measurement, extensively adopt multi-thread multipoint method, promptly on canal cross section, arrange many vertical surveys line from left to right, on every survey line, arrange a plurality of measuring points again, then, calculate the partial discharge of channel according to the measurement data of individual measuring point, partial discharge is added up calculate the total flow of channel again.Measure and use rotary propeller type knotmeter measurement flow rate, with water level tape measure water level.This method flow measurement precision only can satisfy the needs of real work, but still has many defectives:
A. survey the flow longer duration one time, the flow measurement workload is big.
B. can't measure continuously.
C. data recording, amount of calculation are big.
D. each speed measuring point tests the speed and can not carry out simultaneously, and the flow velocity of each point is again in continuous variation, and measuring error is difficult to control.
3, ultrasonic velocity meter: be a pair of ultrasonic emitting, receiving transducer to be set in channel two sides upstream and downstream, their line becomes certain incident angle with current, the mistiming of measuring the emission of ultrasound wave following current and adverse current just can calculate mean flow rate on the line by funtcional relationship.Because ultrasonic velocity meter is subjected to suspension, silt, aeration bigger when channel tests the speed, installation difficulty in addition costs an arm and a leg and promotes the use of comparatively difficulty.
4, intelligent flow velocity one water level operation method flowmeter: the knotmeter with continuous coverage function is placed in fixedly speed measuring point y
0On the position, by it and limnimeter flow velocity, water level value are converted in the converter that electric signal is transferred to built-in micro computer, micro computer carries out just can calculating accurately after the computing flow of channel to above-mentioned data and canal cross section physical dimension that we have imported.If a mud level sensor is installed on channel again, measure the deposition thickness of channel bottom, just can further improve the flow measurement precision.But after the operation through one period, exposed some new insoluble technical matterss:
Need when A. electromagnetic current meter is installed fix, be fixed on the alluvial that can cause silt at the bottom of the canal, can be piled up, twine the operate as normal that all can influence sensor by floating thing again when being fixed on the channel erection bridge with support bar.When larger object is arranged in the canal with water sports, also can be because of clashing into direct damage sensor.
B. it is constant for a long time that the water level in the channel is difficult to assurance, and the relational expression of speed measuring point and water level changes when water level changes, although use correction factor to revise the increase that still can cause measuring error.As h≤y
0Flowmeter can't be worked.
Summary of the invention
The purpose of this invention is to provide a kind of intelligent canal capacity and take into account its measuring method with servo tracking system, solve the knotmeter fixed installation make the channel flow measurement because of the channel floating thing is piled up, is twined, the inconvenience cleaning, can not long-term stable operation problem; Solve the flow measurement precision that improves the canal capacity meter, make automatic, the long-term technical matters of measuring of the big flow of channel; The straight-line segment of solve to require measuring channel is short, flow measurement range is big, be not subjected to the influence that floating thing in the water body, silt, bubble and water level change significantly, flow sensor does not produce resistance to channel technical barrier when measuring.
Technical scheme of the present invention: this intelligent canal capacity meter with servo tracking system, comprise the limnimeter and the knotmeter that connect converter by outgoing cable respectively, it is characterized in that: connect displacement detector near the position of knotmeter, knotmeter and displacement detector are fixed on the dynamic push rod front end of servo tracking topworks, its servo tracking topworks is made up of the driving mechanism connection push rod of servo tracking system control, and the driving mechanism of its servo tracking topworks and converter, limnimeter all are fixed on the erection bridge.
Above-mentioned push rod is flexible push rod, and the driving mechanism of its servo tracking topworks is threaded with flexible push rod.
Above-mentioned push rod is the cantilever push rod, and the driving mechanism of its servo tracking topworks is connected with the contact of cantilever push rod pushing tow.
Above-mentioned cantilever push rod by fixed bar, main boom, pay cantilever and erection bridge is formed an articulated parallelogram based jointly, main boom contacts with driving mechanism pushing tow on being fixed on erection bridge and is connected.
Above-mentioned displacement detector is displacement switch, displacement transducer, level switch, liquid level sensor or level electrode.
Above-mentioned converter also is connected with mud position instrument.
The driving mechanism of above-mentioned servo tracking topworks is an electric driving mechanism, driving mechanism or pneumatic drive mechanism surge.
This measuring method with intelligent canal capacity meter of servo tracking system, it is characterized in that: with limnimeter, the driving mechanism of converter and servo tracking topworks places on the erection bridge, knotmeter and displacement detector are installed in the push rod front end of servo tracking topworks, and they are connected with converter by outgoing cable, the actual water level of measuring according to limnimeter by the micro computer of converter, servo tracking topworks adjusting knotmeter by servo tracking system tests the speed to the set-point point position under the measured water level, and measuring-signal fed back to converter, calculate the flow of channel then by the micro computer of converter.
The basic functional principle of flowmeter is: the actual water level that the micro computer in the flowmeter converter is measured according to water level gauge, the output control signal removes to drive servo tracking topworks drive knotmeter and displacement detector is done upper and lower moving in channel, after displacement detector detects knotmeter and has arrived the set point position, displacement transducer is to knotmeter of converter feedback signal that puts in place, micro computer in the converter is according to this signal at stop drive control signal, servo tracking topworks quits work, and knotmeter begins to test the speed.Micro computer in the converter is according to water level, the instantaneous velocity value of actual measurement and the channel physical dimension of having inserted, and flow vertical, average correction factor go out the flow of channel according to predetermined calculated with mathematical model.When measuring the flow of large channel,, also can adopt many current meters, multimetering method for guaranteeing measuring accuracy.
Beneficial effect: the present invention is in the river course, during canal capacity is measured, knotmeter and limnimeter are adopted on-fixed point position mounting means, be arranged on the lever arm front end of servo tracking system control servo tracking topworks, the servo tracking topworks that is driven by driving mechanism moves, the actual water level of measuring according to limnimeter by the micro computer of converter, servo tracking topworks adjusting knotmeter and displacement detector by servo tracking system test the speed to the set-point point position under the measured water level, are gone out the flow of channel then according to the waterpower calculated with mathematical model by the micro computer of converter.The present invention has that to measure flow range big; Knotmeter, mud position instrument do not produce resistance to channel; Be not subjected to the tributary backwater effect during measurement; Require the straight-line segment of flow measurement channel short; Simple in structure, volume is little, in light weight, easy for installation; Characteristics such as equipment and executive cost are cheap.The demonstration of this kind flowmeter, output, printing function are complete.Can show data such as water level, mud position, flow velocity, instantaneous delivery and integrated flow, have RS-232 interface to host computer transmit data and regularly, print data function immediately.Improved the flow measurement precision, make measuring automatically, for a long time of the big flow of channel become reality, overcome knotmeter and fixedly mounted the significant deficiency of bringing to the channel flow measurement, solved flowmeter because of the channel floating thing is piled up, is twined, the inconvenience cleaning, can not long-term stable operation problem.Be applicable to the flow measurement of rectangles such as reservoir, river course hydraulic engineering, urban water supply, field irrigation, trapezoidal channel.
Description of drawings
Fig. 1 is the synoptic diagram of telescopic intelligent canal capacity meter with servo tracking system when being used for the channel flow measurement;
Fig. 2 is the enlarged drawing of A place servo tracking topworks and knotmeter connecting portion among Fig. 1.
Fig. 3 is intelligent canal capacity meter that cantilevered has the servo tracking system synoptic diagram when being used for the channel flow measurement.
Fig. 4 is a structural principle block diagram of the present invention.
Embodiment
Embodiment one: the intelligent canal capacity meter that the present invention is telescopic to have a servo tracking system is referring to Fig. 1,2:
Connect converter 4 by outgoing cable 7 limnimeters 1, connect displacement detector 5 near the position of its knotmeter 2, knotmeter 2 and displacement detector 5 are fixed on the front end of the dynamic flexible push rod 8 of servo tracking topworks 3, its servo tracking topworks is made up of the flexible push rod 8 of driving mechanism connection of servo tracking system control, and the driving mechanism of its servo tracking topworks and converter, limnimeter all are fixed on the erection bridge 6.
Servo tracking topworks 3 is telescopic, is made up of parts such as motor, speed change gear, flexible push rod, the outputs of travel position feedback signal.Push rod is flexible push rod, and the driving mechanism of its servo tracking topworks is threaded with flexible push rod, and flexible push rod is a screw shaped, can drive the push rod that stretches during the forward and reverse rotation of motor and make stretching motion.Because knotmeter 2 and displacement detector 5 are installed in the front end of flexible push rod, servo tracking topworks is vertically mounted on the channel, so knotmeter is followed flexible push rod and moved up and down in water in a canal.According to the position feed back signal of servo tracking topworks, the flexible push rod of may command accurately is positioned certain a bit.The servo tracking topworks that the present invention uses is the HDG type electric pushrod that Wuxi City south and hydropneumatic company limited produce, 1000 kilograms of thrusts, 2 meters of strokes.
Embodiment two, and the intelligent canal capacity meter that cantilevered has a servo tracking system is referring to Fig. 3:
The function of limnimeter 1, knotmeter 2, converter 4, displacement detector 5, erection bridge 6 is all identical with embodiment one, and only variation has taken place the structure of servo tracking topworks.
Servo tracking topworks 3 is cantilevereds, the cantilever push rod of servo tracking topworks 3 is formed an articulated parallelogram based jointly by two fulcrums on fixed bar 9, main boom 10, pair cantilever 11 and the erection bridge 12,13, main boom 10 is connected by the driving mechanism pushing tow of servo tracking topworks, two fulcrums of the driving mechanism of servo tracking topworks, one on main boom, one on erection bridge.When driving mechanism moved, the fixed bar that will promote hinged parallelogram drive moved up and down, and fixed bar 9 can remain a constant angle with the water surface, thereby made the stable work of knotmeter 2 energy.What the cantilevered servo tracking topworks of present embodiment two used is the HDG type electric pushrod that Wuxi City south and hydropneumatic company limited produce, 1000 kilograms of thrusts, 0.5 meter of stroke.Obviously, the push rod of servo tracking topworks 3 can also have many forms, as long as can follow the motion of servo tracking topworks, knotmeter 2 remains a constant angle with the water surface and gets final product.
Converter 4 in the embodiment of the invention two also is the motor start-up according to SEA LEVEL VARIATION signal and timing working signal output drive signal control servo tracking topworks 3, the push rod of motor drives servo tracking topworks dangles, fixed bar is moved up and down drive knotmeter 2 upper and lower displacements, when the position feed back signal of servo tracking topworks 3 indication knotmeter arrives new given position, servo tracking topworks 3 quits work, and knotmeter 2 begins to test the speed.In figure: when the channel water level is H, knotmeter 2 is at the y point, when SEA LEVEL VARIATION arrives h1, servo tracking topworks 3 will be according to the instruction cantilever pushrod movement of converter 4, make knotmeter 2 displacements, when servo tracking topworks 3 position feed back signals indication knotmeter 2 arrived the y1 point, servo tracking topworks 3 quit work, and knotmeter 2 begins to test the speed.Moving of the position, working point of knotmeter 2, except the position feed back signal of available servo tracking topworks 3 is determined, also can be by level switch, liquid level sensor, level electrode being installed simultaneously in knotmeter 2 positions, its detected water signal is transferred to converter 4 controls knotmeter 2 and be displaced to the y1 point.
The driving mechanism of above-mentioned servo tracking topworks can be an electric driving mechanism, driving mechanism or pneumatic drive mechanism surge.
Structural principle of the present invention is referring to Fig. 4: limnimeter 1 is connected converter 4 respectively with mud position instrument 12, converter 4 built-in micro computers, preset width of the channel, the operational mathematics model, the flow velocity correction factor, converter 4 links to each other with displacement detector 5 with knotmeter 2 through servo tracking topworks 3, the actual water level of measuring according to limnimeter by the micro computer of converter, servo tracking topworks adjusting knotmeter by servo tracking system tests the speed to the set-point point position under the measured water level, and measuring-signal fed back to converter, calculate the flow of channel then by the micro computer of converter, flow velocity, liquid level shows signal and output comes.Wherein mud position instrument can add or remove as required.
Claims (8)
1, a kind of intelligent canal capacity meter with servo tracking system, comprise the limnimeter and the knotmeter that connect converter by outgoing cable respectively, it is characterized in that: connect displacement detector near the position of knotmeter, knotmeter and displacement detector are fixed on the dynamic push rod front end of servo tracking topworks, the servo tracking topworks of servo tracking system is made up of the driving mechanism connection push rod of servo tracking system control, the driving mechanism and the converter of the servo tracking topworks of servo tracking system, limnimeter all is fixed on the erection bridge, the actual water level of measuring according to limnimeter by the micro computer of converter, servo tracking topworks adjusting knotmeter by servo tracking system tests the speed to the set-point point position under the measured water level, and measuring-signal fed back to converter, calculate the flow of channel then by the micro computer of converter.
2, the intelligent canal capacity meter with servo tracking system according to claim 1 is characterized in that: described push rod is flexible push rod, and the driving mechanism of the servo tracking topworks of servo tracking system is threaded with flexible push rod.
3, the intelligent canal capacity meter with servo tracking system according to claim 1, it is characterized in that: described push rod is the cantilever push rod, the driving mechanism of the servo tracking topworks of servo tracking system is connected with the contact of cantilever push rod pushing tow.
4, the intelligent canal capacity meter with servo tracking system according to claim 3, it is characterized in that: described cantilever push rod by fixed bar, main boom, pay cantilever and erection bridge is formed an articulated parallelogram based jointly, main boom contacts with driving mechanism pushing tow on being fixed on erection bridge and is connected.
5, according to claim 1 or 2 or 3 described intelligent canal capacity meters with servo tracking system, it is characterized in that: described displacement detector is displacement switch, displacement transducer, level switch, liquid level sensor or level electrode.
6, according to claim 1 or 2 or 3 described intelligent canal capacity meters with servo tracking system, it is characterized in that: described converter also is connected with mud position instrument.
7, according to claim 1 or 2 or 3 described intelligent canal capacity meters with servo tracking system, it is characterized in that: the driving mechanism of described servo tracking topworks is an electric driving mechanism, driving mechanism or pneumatic drive mechanism surge.
8, a kind of measuring method with intelligent canal capacity meter of servo tracking system, it is characterized in that: with limnimeter, the driving mechanism of converter and servo tracking topworks places on the erection bridge, knotmeter and displacement detector are installed in the push rod front end of servo tracking topworks, and they are connected with converter by outgoing cable, the actual water level of measuring according to limnimeter by the micro computer of converter, servo tracking topworks adjusting knotmeter by servo tracking system tests the speed to the set-point point position under the measured water level, and measuring-signal fed back to converter, calculate the flow of channel then by the micro computer of converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410037415 CN1281930C (en) | 2004-04-30 | 2004-04-30 | Intellectualized channel flowmeter possessing servo tracking system and measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410037415 CN1281930C (en) | 2004-04-30 | 2004-04-30 | Intellectualized channel flowmeter possessing servo tracking system and measuring method thereof |
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| Publication Number | Publication Date |
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| CN1570573A CN1570573A (en) | 2005-01-26 |
| CN1281930C true CN1281930C (en) | 2006-10-25 |
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| CN 200410037415 Expired - Fee Related CN1281930C (en) | 2004-04-30 | 2004-04-30 | Intellectualized channel flowmeter possessing servo tracking system and measuring method thereof |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102207440A (en) * | 2010-03-31 | 2011-10-05 | 北京西山新干线环保设备有限公司 | Apparatus and method for measuring density of solid-containing liquid |
| CN103245385A (en) * | 2013-05-16 | 2013-08-14 | 济南鲁纺仪佳自控技术有限公司 | Flow-rate self-correcting open channel flow measuring device |
| CN105823526A (en) * | 2016-06-16 | 2016-08-03 | 唐山现代工控技术有限公司 | Deposition and water level monitor and application method thereof |
| CN108107234A (en) * | 2018-01-19 | 2018-06-01 | 昆明理工大学 | Water surface flow rate detection system and its detection method under a kind of high water condition |
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Inventor after: Wang Ping Inventor after: Zhang Fan Inventor before: Wang Ping |
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Granted publication date: 20061025 Termination date: 20100430 |