CN103471684A - Flotation liquid level reflection-type ultrasonic test instrument and test method - Google Patents
Flotation liquid level reflection-type ultrasonic test instrument and test method Download PDFInfo
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- CN103471684A CN103471684A CN2013104224717A CN201310422471A CN103471684A CN 103471684 A CN103471684 A CN 103471684A CN 2013104224717 A CN2013104224717 A CN 2013104224717A CN 201310422471 A CN201310422471 A CN 201310422471A CN 103471684 A CN103471684 A CN 103471684A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
- B03D1/028—Control and monitoring of flotation processes; computer models therefor
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Abstract
The invention relates to a flotation liquid level reflection-type ultrasonic test instrument and a test method. The flotation liquid level reflection-type ultrasonic test instrument comprises a test support, a circular slideway, a reflection disc, a floater, an ultrasonic probe, sensors, and a DSP (Digital Signal Processor), wherein the circular slideway is fixed at the lower part of the test support; the ultrasonic probe, the temperature sensor and the humidity sensor are fixed at a top part; a connecting rod is moved in the circular slideway up and down; the top end of the connecting rod is fixedly connected with the reflection disc; the bottom end of the connecting rod is fixedly connected with the floater; test information received by the DSP is subjected to operation processing, and the processed information is displayed through a display panel on the DSP, and is output through a signal interface. The flotation liquid level reflection-type ultrasonic test instrument and the test method have the advantages that the test instrument is high in operational stability, and has prolonged service life of equipment; the phenomenon of jam caused by fluctuation of ore pulp is avoided; environmental parameters can be tested, and errors of ultrasonic waves produced by environmental temperature, and especially humidity change can be compensated; random errors are eliminated through a smoothing algorithm, and display and networking teletransmission can be realized.
Description
Technical field
The present invention relates to a kind of Level meter and detection method, particularly relate to a kind of flotation liquid level reflection type ultrasonic detector and detection method for using on the flotation machine of ore dressing plant.
Background technology
Flotation is that iron ore beneficiation divides a kind of beneficiation method of choosing most widely used effect best.The flotation liquid level is to control an important indicator of flotation production operation, and whether what the flotation liquid level was controlled stablizes, and directly the dressing product index is exerted an influence.The flotation fluid level measuring arrangement is the important component part of flotation liquid level automatic checkout system.The accurate operation of existing flotation operation is more and more higher to scope and the accuracy requirement of flotation level gauging, require liquid level emasuring device to possess the characteristics wear-resistant, that reliability is high simultaneously, can eliminate level fluctuation and froth bed and change the pseudo-liquid level signal brought, and eliminate the harmful effects such as trueness error that the ball float because coming sticking of ore pulp sinks to producing.It is several that flotation liquid level gauge commonly used mainly contains floating type liquid level indicating, laser liquid level gauge, static pressure liquid level meter, ultrasonic level gage etc.
At present, the ultrasonic level gage often used in use measure portion does not contact with ore pulp, but continuous coverage and one-point measurement; Its shortcoming is that hyperacoustic reflection angle is excessive, affected by peripheral barrier, often occur without measuring or the wrong phenomenon of measuring, and hyperacoustic velocity of wave depends on characteristic, temperature, pressure and the density of propagation medium, affected by environment larger, produce larger error, the froth bed that the ore pulp surface changes in addition also can exert an influence to measuring.
Therefore, but need especially a kind of stable operation flotation liquid level reflection type ultrasonic detector, improve practicality, reliability and comprehensive cost performance.
Summary of the invention
For overcoming the deficiencies in the prior art, the purpose of this invention is to provide flotation liquid level reflection type ultrasonic detector and detection method that a kind of operational reliability is high, reduce environmental factor to measuring the error produced, reduce the random perturbation error.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of flotation liquid level reflection type ultrasonic detector, comprise Bracket for Inspection, circular slideway, reflecting disc, connecting rod, float, ultrasonic probe, temperature sensor, humidity sensor, dsp processor, signal connector, the fixing circular slideway in the Bracket for Inspection bottom, top is ultrasonic probe, temperature sensor, humidity sensor fixedly, connecting rod moves up and down in circular slideway, circular slideway play the guiding role, the connecting rod top is fixedly connected with reflecting disc, bottom is fixedly connected with float, and described reflecting disc is the ultrasonic reflections parts; Dsp processor is connected with ultrasonic probe, temperature sensor, humidity sensor by signal connector, is ultrasonic probe, temperature sensor, humidity sensor power supply and transmission of information; The core parts of described ultrasonic probe for surveying, be used for detecting the distance between ultrasonic probe and reflecting disc; Described temperature sensor testing environment temperature, use as the liquid level signal temperature compensation; Described humidity sensor testing environment humidity, use as the liquid level signal air density compensation.
Described float is and the direct contact component of measuring media, and the float profile is the two terminal circle pyramidal structure, and centre is cylindrical structural.
Described signal connector is the integrated cable bundle for temperature sensor, humidity sensor and ultrasonic probe power supply and signal transmission.
A kind of flotation liquid level reflection type ultrasonic detection method, described ultrasonic probe sends ultrasound wave, and through the reflecting disc reflection, ultrasonic probe sends to range information on dsp processor; Temperature sensor, humidity sensor are delivered to the temperature of detection, humidity information on dsp processor respectively;
The detection information that dsp processor receives is carried out calculation process, the display panel on dsp processor that passes through of handling information is shown, and export by signaling interface.
When described dsp processor carries out calculation process to detection information, adopt backoff algorithm and smoothing algorithm to solve the random perturbation problem, concrete calculation procedure is:
1) measured value and velocity of sound backoff algorithm:
Detecting principle based on ultrasonic distance can draw:
l=(V×τ)/2 ①
Wherein: l is measured value, and v is the velocity of sound, and τ is the echo time;
Draw the relation of the velocity of sound and temperature impact according to detecting data:
Vt=331.4+0.6×t ②
Wherein: Vt is the velocity of sound when temperature t, and t is Current Temperatures, velocity of sound constant during 331.4 relative humidity 0% while being 0 ℃ of temperature, and the 0.6th, temperature becomes again returns coefficient;
Draw the relation of the velocity of sound and humidity effect according to the detection data:
f(Vt)=Vt+Cn×10
-2 ③
n=0,5,10,15,20,25,30,35,40,45,50
Wherein: f (Vt) is temperature t, velocity of sound during relative humidity Cn; Vt is the velocity of sound when temperature t; Cn is the humidity compensate coefficient when temperature t; N is the Temperature Scaling point;
According to 1., 2., 3. formula can draw:
Ultrasonic measurement temperature and humidity compensation computational algorithm:
l=((331.4+0.6×t+Cn×10
-2)×τ)/2 ④
n=0,5,10,15,20,25,30,35,40,45,50；
2) smoothing processing algorithm:
The N that step 1) an is drawn data compare, and remove maximal value, second largest value and minimum value, sub-minimum wherein, then calculate the arithmetic mean of a remaining N-4 data.That is:
Wherein: L (1)≤L (2)≤L (3)≤L (4) ... ≤ L (N-2)≤L (N-1), N >=12.
Compared with prior art, the invention has the beneficial effects as follows:
1), owing to using circular slideway and biconial float, make that this flotation liquid level reflection type ultrasonic detector operation stability is high, service life of equipment extends, and be not subject to the ore pulp fluctuation and produce stuck phenomenon.
2) due to serviceability temperature, humidity sensor, can the testing environment parameter, can compensate ultrasound wave by environment temperature, the error that especially humidity change to produce, solve that air humidity varies in the winter and summer factory building of flotation workshop is huge and ultrasonic velocity that cause changes the measuring error produced.
3) using dsp processor to be processed computing, can automatically solve the impact that environmental change brings, by smoothing algorithm, eliminate stochastic error, can show, the teletransmission of networking, is intelligent instrument.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: the circular slideway 3-of 1-Bracket for Inspection 2-reflecting disc 4-connecting rod 5-float 6-ultrasonic probe 7-temperature sensor 8-humidity sensor 9-DSP processor 10-signal connector.
Embodiment
Below in conjunction with Figure of description, the present invention is described in detail, but should be noted that enforcement of the present invention is not limited to following embodiment.
See Fig. 1, a kind of flotation liquid level reflection type ultrasonic detector, comprise Bracket for Inspection 1, circular slideway 2, reflecting disc 3, connecting rod 4, float 5, ultrasonic probe 6, temperature sensor 7, humidity sensor 8, dsp processor 9, signal connector 10, the fixing circular slideway 2 in Bracket for Inspection 1 bottom, top is ultrasonic probe 6 fixedly, temperature sensor 7, humidity sensor 8, connecting rod 4 moves up and down in circular slideway 2, circular slideway 2 play the guiding role, connecting rod 4 tops are fixedly connected with reflecting disc 3, bottom is fixedly connected with float 5, described reflecting disc 3 is the ultrasonic reflections parts, dsp processor 9 is connected with ultrasonic probe 6, temperature sensor 7, humidity sensor 8 by signal connector 10, is ultrasonic probe 6, temperature sensor 7, humidity sensor 8 power supply and transmission of informations, the core parts of described ultrasonic probe 6 for surveying, be used for detecting the distance between ultrasonic probe 6 and reflecting disc 3, described temperature sensor 7 testing environment temperature, use as the liquid level signal temperature compensation, described humidity sensor 8 testing environment humidity, use as the liquid level signal air density compensation.
Described float 5 is and the direct contact component of measuring media, and float 5 profiles are the two terminal circle pyramidal structure, and centre is cylindrical structural.
Described signal connector 10 is the integrated cable bundles for temperature sensor 7, humidity sensor 8 and ultrasonic probe 6 power supplies and signal transmission.
Course of work when flotation liquid level reflection type ultrasonic detects: described ultrasonic probe 6 sends ultrasound wave, and through reflecting disc 3 reflections, ultrasonic probe 6 sends to range information on dsp processor 9; Temperature sensor 7, humidity sensor 8 are delivered to the temperature of detection, humidity information on dsp processor 9 respectively;
The detection information that dsp processor 9 receives is carried out calculation process, the display panel on dsp processor 9 that passes through of handling information is shown, and export by signaling interface.
When 9 pairs of detection information of described dsp processor are carried out calculation process, adopt backoff algorithm and smoothing algorithm to solve the random perturbation problem, concrete calculation procedure is:
1) measured value and velocity of sound backoff algorithm:
Detecting principle based on ultrasonic distance can draw:
l=(V×τ)/2 ①
Wherein: l is measured value, and v is the velocity of sound, and τ is the echo time;
Draw the relation of the velocity of sound and temperature impact according to detecting data (seeing instructions subordinate list 1):
Vt=331.4+0.6×t ②
Wherein: Vt is the velocity of sound when temperature t, and t is Current Temperatures, velocity of sound constant during 331.4 relative humidity 0% while being 0 ℃ of temperature, and the 0.6th, temperature becomes again returns coefficient;
Draw the relation of the velocity of sound and humidity effect according to detection data (seeing instructions subordinate list 1):
f(Vt)=Vt+Cn×10
-2 ③
n=0,5,10,15,20,25,30,35,40,45,50
Wherein: f (Vt) is temperature t, velocity of sound during relative humidity Cn; Vt is the velocity of sound when temperature t; Cn is the humidity compensate coefficient when temperature t; N is the Temperature Scaling point;
According to 1., 2., 3. formula can draw:
Ultrasonic measurement temperature and humidity compensation computational algorithm:
l=((331.4+0.6×t+Cn×10
-2)×τ)/2 ④
n=0,5,10,15,20,25,30,35,40,45,50；
2) smoothing processing algorithm:
The N that step 1) an is drawn data compare, and remove maximal value, second largest value and minimum value, sub-minimum wherein, then calculate the arithmetic mean of a remaining N-4 data.That is:
Wherein: L (1)≤L (2)≤L (3)≤L (4) ... ≤ L (N-2)≤L (N-1), N >=12.
In actual applications, the desirable any value of N, but, in order to accelerate to measure computing velocity, N generally can not be too large, we are taken as 12, are 12 and get 8 value-taking mean value process again.
Embodiment:
Bracket for Inspection 1 adopts the cold rolling slab of Q235 of thickness 2.0mm by bending and molding, and assembly is welded to form the structure-steel framing of height 1800mm, length 500mm, width 400mm, in integral body, does antirust processing, the outside corrosion protection coating that is coated with.Bracket for Inspection 1 is used for fixing circular slideway 2, ultrasonic probe 6, temperature sensor 7, humidity sensor 8.Bracket for Inspection 1 is connected with the installation of flotation machine to adopt and is welded and fixed or bolt is fixed two kinds of modes.
Reflecting disc 3 adopts the manufacture of 2.0mm corrosion resistant plate, and profile is circular, and radius 150mm～180mm, be threaded with connecting rod 4 use, and polishing is done on reflecting disc 3 surfaces.Reflecting disc 3 is as hyperacoustic reflection part.
5 liang of end topers of float are identical, adopt the manufacture of 1.0mm corrosion resistant plate, and cone footpath 180mm, bore high 180mm, and the high 160mm of middle cylinder, be welded to connect with connecting rod 4.Float 5 is the parts that directly contact with ore pulp.
The thermistor (temperature) sensor that when temperature sensor 7 adopts 25 ℃, resistance is 2252 Ω, ± 0.2 ℃ of interchangeable error, measurement range-80 ℃～120 ℃.Resistance signal enters dsp processor 9 by signal connector 10.
The course of work of the present invention is:
Flotation liquid level reflection type ultrasonic detector is comprised of Bracket for Inspection 1, circular slideway 2, reflecting disc 3, connecting rod 4, float 5, ultrasonic probe 6, temperature sensor 7, humidity sensor 8, dsp processor 9, signal connector 10.At first Bracket for Inspection 1 is fixed on and needs to detect on the flotation machine sidewall of liquid level, during installation, will avoid froth paddle and stirring apparatus, circular slideway 2, ultrasonic probe 6, temperature sensor 7, humidity sensor 8 are installed afterwards on Bracket for Inspection 1; By connecting rod 4 from centre through circular slideway 2, and float 5, reflecting disc 3 are combined and are arranged on circular slideway 2; Dsp processor 9 is connected with ultrasonic probe 6, temperature sensor 7, humidity sensor 8 by signal connector 10; Dsp processor 9 is arranged near the position of flotation machine, makes signal connector 10 wiring paths be less than 20m, and signal connector 10 is wanted the added metal protective casing, prevents electromagnetic interference (EMI).Like this, when the flotation machine liquid level changes, ore pulp drives float 5 and fluctuates, and simultaneously, ultrasonic probe 6 also changes with the relative distance of reflecting disc 3, ultrasonic probe 6 converts variable in distance to electric signal input dsp processor 9,9 pairs of electric signal computings of dsp processor, add the ambient compensation of temperature, moisture signal, finally draws the level value of now, demonstration screen display reading at dsp processor 9 enters other system by the data-interface teletransmission simultaneously.
Be below instructions subordinate list 1: the velocity of sound and temperature, humidity corresponding relation tables of data.
The velocity of sound and temperature, humidity corresponding relation tables of data
In table: walk crosswise and mean the impact of temperature on the air velocity of sound, the impact of perpendicular line display humidity on the air velocity of sound.
Claims (5)
1. a flotation liquid level reflection type ultrasonic detector, it is characterized in that, comprise Bracket for Inspection, circular slideway, reflecting disc, connecting rod, float, ultrasonic probe, temperature sensor, humidity sensor, dsp processor, signal connector, the fixing circular slideway in the Bracket for Inspection bottom, top is ultrasonic probe, temperature sensor, humidity sensor fixedly, connecting rod moves up and down in circular slideway, circular slideway play the guiding role, the connecting rod top is fixedly connected with reflecting disc, bottom is fixedly connected with float, and described reflecting disc is the ultrasonic reflections parts; Dsp processor is connected with ultrasonic probe, temperature sensor, humidity sensor by signal connector, is ultrasonic probe, temperature sensor, humidity sensor power supply and transmission of information; The core parts of described ultrasonic probe for surveying, be used for detecting the distance between ultrasonic probe and reflecting disc; Described temperature sensor testing environment temperature, use as the liquid level signal temperature compensation; Described humidity sensor testing environment humidity, use as the liquid level signal air density compensation.
2. a kind of flotation liquid level reflection type ultrasonic detector according to claim 1, is characterized in that, described float is and the direct contact component of measuring media, and the float profile is the two terminal circle pyramidal structure, and centre is cylindrical structural.
3. a kind of flotation liquid level reflection type ultrasonic detector according to claim 1, is characterized in that, described signal connector is the integrated cable bundle for temperature sensor, humidity sensor and ultrasonic probe power supply and signal transmission.
4. the detection method of a kind of flotation liquid level reflection type ultrasonic detector according to claim 1, is characterized in that, described ultrasonic probe sends ultrasound wave, and through the reflecting disc reflection, ultrasonic probe sends to range information on dsp processor; Temperature sensor, humidity sensor are delivered to the temperature of detection, humidity information on dsp processor respectively;
The detection information that dsp processor receives is carried out calculation process, the display panel on dsp processor that passes through of handling information is shown, and export by signaling interface.
5. the detection method of a kind of flotation liquid level reflection type ultrasonic detector according to claim 4, it is characterized in that, when described dsp processor carries out calculation process to detection information, adopt backoff algorithm and smoothing algorithm to solve the random perturbation problem, concrete calculation procedure is:
1) measured value and velocity of sound backoff algorithm:
Detecting principle based on ultrasonic distance can draw:
l=(V×τ)/2 ①
Wherein: l is measured value, and v is the velocity of sound, and τ is the echo time;
Draw the relation of the velocity of sound and temperature impact according to detecting data:
Vt=331.4+0.6×t ②
Wherein: Vt is the velocity of sound when temperature t, and t is Current Temperatures, velocity of sound constant during 331.4 relative humidity 0% while being 0 ℃ of temperature, and the 0.6th, temperature becomes again returns coefficient;
Draw the relation of the velocity of sound and humidity effect according to the detection data:
f(Vt)=Vt+Cn×10
-2 ③
n=0,5,10,15,20,25,30,35,40,45,50
Wherein: f (Vt) is temperature t, velocity of sound during relative humidity Cn; Vt is the velocity of sound when temperature t; Cn is the humidity compensate coefficient when temperature t; N is the Temperature Scaling point;
According to 1., 2., 3. formula can draw:
Ultrasonic measurement temperature and humidity compensation computational algorithm:
l=((331.4+0.6×t+Cn×10
-2)×τ)/2 ④
n=0,5,10,15,20,25,30,35,40,45,50；
2) smoothing processing algorithm:
The N that step 1) an is drawn data compare, and remove maximal value, second largest value and minimum value, sub-minimum wherein, then calculate the arithmetic mean of a remaining N-4 data.That is:
Wherein: L (1)≤L (2)≤L (3)≤L (4) ... ≤ L (N-2)≤L (N-1), N >=12.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897245A (en) * | 2015-06-04 | 2015-09-09 | 华北水利水电大学 | Zigbee-based multi-point acquisition self-correction water level detector and measuring method |
| CN104949737A (en) * | 2015-05-28 | 2015-09-30 | 上海云鱼智能科技有限公司 | Non-contact heavy-hammer level gauge |
| CN105547418A (en) * | 2015-12-07 | 2016-05-04 | 中国电力科学研究院 | Detection device and detection method for optical fiber oil level sensor performance used for transformer |
| CN105736121A (en) * | 2014-12-26 | 2016-07-06 | 福特环球技术公司 | Method And System For Engine Cooling System Control |
| CN104923411B (en) * | 2015-07-06 | 2018-08-10 | 中国黄金集团内蒙古矿业有限公司 | Bulk flotation yield control system and control method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105736121A (en) * | 2014-12-26 | 2016-07-06 | 福特环球技术公司 | Method And System For Engine Cooling System Control |
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| CN104923411B (en) * | 2015-07-06 | 2018-08-10 | 中国黄金集团内蒙古矿业有限公司 | Bulk flotation yield control system and control method |
| CN105547418A (en) * | 2015-12-07 | 2016-05-04 | 中国电力科学研究院 | Detection device and detection method for optical fiber oil level sensor performance used for transformer |
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Application publication date: 20131225 |