CN104267752A - Detecting and controlling method for liquid level of high-temperature solution - Google Patents
Detecting and controlling method for liquid level of high-temperature solution Download PDFInfo
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- CN104267752A CN104267752A CN201410582538.8A CN201410582538A CN104267752A CN 104267752 A CN104267752 A CN 104267752A CN 201410582538 A CN201410582538 A CN 201410582538A CN 104267752 A CN104267752 A CN 104267752A
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Abstract
The invention discloses a detecting and controlling method for the liquid level of a high-temperature solution. The detecting and controlling method is characterized in that an electric conduction baseboard used for transmitting electric wave signals is arranged at the bottom of a high-temperature solution kiln; an exploring electrode used for sampling the electric wave signals is arranged above the high-temperature solution and controlled to move close to the surface of the high-temperature solution until the exploring electrode is in contact with the high-temperature solution, and the exploring electrode starts to sample to obtain contact signals; the exploring electrode is controlled to move far away from the surface of the high-temperature solution until the exploring electrode is separated from the high-temperature solution, and the exploring electrode starts to sample to obtain falling-off signals; a liquid level detector receives the contact signals and the falling-off signals generated from the above steps and transmits the signals to a PLC (Programmable Logic Controller); the liquid level height is obtained through PLC treatment; based on the liquid level height obtained from the above step, and the feeding frequency is obtained through the formula shown in the specification. According to the invention, the detecting and controlling method has the benefits that the liquid level can be kept stable continuously, the technical index in the kiln can be guaranteed to reach technological requirements, the yield and the qualified rate of products can be improved, and the rejection rate is low.
Description
Technical field
The present invention relates to pyrosol technical field of liquid level measurement, be specifically related to a kind of pyrosol level detection and control method.
Background technology
Basalt continuous fiber take basalt ore as raw material, after 1450 degree of-1500 degree high-temperature fusion, by the continuous fiber of platinum-rhodium alloy bushing high speed pulling, this fiber is except having the feature such as high strength, high-modulus, also there is resistance to high/low warm nature, acid and alkali-resistance, anti-oxidant, the excellent properties such as radioresistance, thermal acoustic insulation, fire protection flame retarding, therefore, basalt fibre can be widely used in the fields such as fire-fighting, environmental protection, Aero-Space, military project, automobile shipbuilding, engineering plastics and building.
The ore producing basalt continuous fiber needs high temperature melting in kiln, solution flows into bushing, in wire-drawing operation process, need in kiln momentarily to supplement ore, and the reinforced speed of ore directly affects the liquid level of the Irish touchstone solution in kiln, the liquid level of Irish touchstone solution directly affects again the stability of wire-drawing operation and the quality of basalt fibre, therefore the stability of liquid level, accuracy and controllability are one of key process parameters ensureing administration measure, because basalt ore needs just can be fused into liquid at very high temperatures, therefore the level gauging of Irish touchstone liquid just can not adopt conventional method.
At present, most of Irish touchstone manufacturer mainly adopts the liquid level of following three kinds of methods to Irish touchstone solution to measure, the first relies on the method for artificial cruising to judge Irish touchstone liquid, rely on artificial experience to control charging rate, thus reach the object controlling liquid level, the method produces different results because the personnel of cruising personnel are different, be very difficult to promote and control very extensive, and need the moment to patrol and examine, hysteresis quality is very serious, needs the manpower and materials of at substantial; Second method carries out Survey control with liquid level controller on platinum probe, it is using switching signal as detection means, on the reinforced motor of adjustment, the on-off times of magnet takes control charging rate to, thus reach the object controlling liquid level, be mainly used in glass fibre crucible pot fiber to produce, because basalt fibre is produced in composition, furnace atmosphere, environment, temperature etc. many different from glass fibre, basalt fibre kiln furnace atmosphere is complicated, Irish touchstone liquid component is changeable, environment temperature is also high than glass fibre, institute is unstable in this way, can not large-scale popularization use; The third method is that the equipment based on nucleon technology is measured, this kind equipment because of expensive, there is radiation pollution problem, radiation source is difficult to the reasons such as disposal and causes and only could use at large high-temperature smelting furnace, progressively eliminate now.
Based on the shortcoming of above three kinds of methods, be necessary to do for existing level gauging and control method further study and improve.
Summary of the invention
Instant invention overcomes that liquid level that the Measurement & Control method adopted in prior art exists pyrosol is difficult to measure, measuring accuracy is low, liquid level is difficult to control thus affects the subsequent techniques such as wire drawing stablize, product yield, the more high deficiency of rejection rate, there is provided a kind of technical indicator guaranteed in high-temperature smelting pot to reach technological requirement, and the output of product and the pyrosol level detection of qualification rate and control method can be improved.
For achieving the above object, the present invention is by the following technical solutions:
The detection of pyrosol liquid level and a control method, described detection and control method realize based on liquid level detection system, and it is characterized in that, it comprises:
A, bottom pyrosol kiln, be provided with conductive soleplate for emitting radio waves signal, above high-temp liquid, be provided with the exploring electrode for sampling to electric wave signal;
B, control exploring electrode are mobile near high-temp liquid surface, until when exploring electrode touches high-temp liquid, exploring electrode starts sampling and obtains activation signal;
C, control exploring electrode are mobile away from high-temp liquid surface, until when exploring electrode leaves high-temp liquid, exploring electrode starts sampling and obtains the signal that comes off;
Activation signal in d, Level meter receiving step b and the separating signal in step c, and transfer signals to PLC;
E, PLC process obtains liquid level;
F, based on the liquid level obtained in step e, to pass through
obtain reinforced frequency, wherein f1 is the reinforced frequency of current time, ρ is the density of high temperature Irish touchstone solution, the area that the liquid level that s is high temperature kiln can cover, hset is the setting value of liquid level, h1 is current liquid level, h0 was the liquid level in a upper moment, Q1 is that the last detection moment is to the current calculating flow in moment and the function of time, Q0 detected the moment supreme flow in one-time detection moment and the function of time upper last time, f0 is last reinforced frequency, and k is correction factor;
G, PLC feed in raw material based on the reinforced frequency control charger obtained in step f.
Detection method first by liquid level in the technical program obtains the height of liquid level, then the height based on liquid level obtains reinforced frequency by liquid level controlling method again, the number of being fed in raw material by reinforced frequency control charger thus the continual and steady of liquid level can be kept, guarantee that in kiln, technical indicator reaches technological requirement, improve output and the qualification rate of product.
Level detection method in the technical program is theoretical theoretical with sonic transmissions based on electricity, employing transmission and reception pattern works, namely bottom pyrosol kiln, be provided with the conductive soleplate for emitting radio waves signal, the exploring electrode for sampling to electric wave signal is provided with above high-temp liquid, on-load voltage waveform and the controlled electric wave signal of frequency on conductive soleplate, electric wave signal is propagated in the Irish touchstone liquid of high temperature, then moveable exploring electrode carries out sampling analysis to the electric wave signal sent from conductive soleplate, thus obtain the relative position of exploring electrode and liquid level.Due in high-temperature smelting pot, fluid molecule and gas molecule all can ionize, and liquids and gases can change along with the difference of liquid component and gas componant, therefore be worthless by the analytic signal height directly obtaining liquid level of decaying, and be difficult to computational analysis in high-temperature smelting pot environment miscellaneous, mobile near high-temp liquid surface based on adopting control exploring electrode in above-mentioned principle this method, until when exploring electrode touches high-temp liquid, exploring electrode starts sampling and obtains activation signal, control exploring electrode mobile away from high-temp liquid surface, until when exploring electrode leaves high-temp liquid, exploring electrode starts sampling and obtains the signal that comes off, by only needing in above-mentioned steps this method to detect two states, one is exploring electrode and liquid comes into contact, another kind is that exploring electrode and liquid depart from, said method obtains liquid level height relative to analyzing decay is more prone to, also reliability is considerably increased from the making angle of circuit board, this programme adopts moveable exploring electrode to detect in addition, exploring electrode is controlled by high-precision exploring electrode auxiliary body, accomplish the controlled of stroke distances and monitoring, the thorough like this level detection that compensate for only detects two states and lost precision, whole system carries out cooperation control by PLC simultaneously.
Liquid level controlling method in the technical program is the liquid level according to obtaining in step a-e, then passes through
calculate reinforced frequency, then by control that charger feeds in raw material number ensure that the continual and steady of liquid level, improve the output of product and qualification rate, rejection rate is low.
Further technical scheme is, described liquid level detection system is made up of Level meter, exploring electrode, conductive soleplate, PLC, charger and step actuator and exploring electrode auxiliary body, described PLC is electrically connected with Level meter, step actuator and charger respectively, institute's Level meter is electrically connected with exploring electrode and conductive soleplate respectively, described exploring electrode auxiliary body respectively with exploring electrode and step actuator.
First exploring electrode auxiliary body is made to drive exploring electrode to move toward liquid level direction from PLC control step driver in the technical program, the simultaneously signal sent back by Level meter of PLC Real-time Collection, complete the measurement of liquid level, then PLC adds the speed of basalt ore raw material according to the Altitude control charger of liquid level, thus make the liquid level in Irish touchstone smelting furnace keep stable, thus make wire-drawing operation stable raising product yield and reduce rejection rate.
Further technical scheme is, described exploring electrode auxiliary body is made up of bracing frame, straight line module, proximity switch, stepper motor, cantilever, described straight line module is arranged on the upper end of bracing frame, described stepper motor is arranged on the top of straight line module, described cantilever is arranged on straight line module, the end that described cantilever is connected with straight line module at it is provided with proximity switch, the described cantilever other end is provided with exploring electrode, and described stepper motor is electrically connected by common insulated conductor with step actuator.
Pass through by bracing frame in the technical program, straight line module, stepper motor, the exploring electrode auxiliary body of proximity switch and cantilever composition, moved by driving stepper motor straight line module, thus have straight line module to drive cantilever motion, exploring electrode is driven to move by cantilever again, the precision problem that Level meter can only measure two states is made up by the motion of exploring electrode, the height of precision is made to control to transfer movable exploring electrode to from Level meter, and the control accuracy increasing exploring electrode is easier than the accuracy of detection increasing Level meter realizes, this device adopts intermittent measurement, greatly reduce the duration of contact of exploring electrode and liquid level, decrease the corrosion of liquid level to exploring electrode, extend the serviceable life of exploring electrode, described stepper motor adopts 57 formula stepper motors of two-phase, this motor has can provide enough moments of torsion, and wiring is few, only have 4 lines, reduce the advantage of cable core number.
Further technical scheme is, described straight line module is made up of dust cover, polished rod and screw mandrel, and described screw mandrel is arranged on polished rod, and described dust cover is arranged on the lower end of polished rod, and described screw mandrel is connected with described stepper motor.
By the lifting apparatus adopting screw mandrel, polished rod forms cantilever jointly in the technical program, can allow level and smooth the moving up and down of cantilever, powerful torsion can be provided, prevent cantilever from shaking, from but exploring electrode steadily movement ensure that the precision of measurement, effectively prevented the dust pollution of site environment by dust cover, and can lubricate it by coating butter on screw mandrel.
Further technical scheme is, is switched between described stepper motor and step actuator by auxiliary reclay, and described auxiliary reclay is electrically connected with PLC.
Achieve between step actuator and stepper motor adopt again auxiliary reclay to carry out break-make by arranging auxiliary reclay in the technical program, just can realize PLC by the indirect control step motor of control step driver.
Further technical scheme is, described stepper motor is servomotor.
In the technical program, by stepper motor is replaced with servomotor, had feedback that PLC can be allowed to understand the distance of on-the-spot screw mandrel motion state and motion more accurately, the reliability of system increases greatly.
Further technical scheme is, described cantilever is made up of aluminium alloy extrusions, and described cantilever two ends are respectively equipped with pagoda mouth, and described cantilever is connected with exploring electrode by fixed connecting plate.
In the technical program, cantilever is made up of aluminium alloy extrusions, and cantilever two ends are provided with four pagoda mouths, for water-cooled, thus protects other devices in high temperature environments.
Further technical scheme is, described PLC is electrically connected with touch-screen and DCS control system respectively.
In the technical program, DCS control system is scattered control system, there is the advantages such as decentralised control, centralized operation, differentiated control, flexible configuration and configuration convenience, the data acquisition of PLC control system can be entered pulpit, and good interactive interface and historical record are provided, by touch-screen can with PLC control system real-time, interactive, good picture can be provided for operator, and show duty and the running parameter of present system.
Pyrosol level detection of the present invention and control method, be especially suitable for being applied in basalt continuous fiber production, also can be used as pyrosol level detection and the control of other ore smeltings, range of application is wide.
The present invention not only may be used for measurement to the liquid level in Irish touchstone pyrosol smelting furnace and control, can also measure and control the liquid level in other pyrosol smelting furnace.
Compared with prior art, the invention has the beneficial effects as follows:
Level sensing instrument only detects the contact of exploring electrode and liquid level or departs from two states, and effectively prevent furnace environment change and the impact that causes, substantially increase the accuracy of Level meter, stability is high; The motion of exploring electrode is driven by exploring electrode auxiliary body, and calculate distance in real time by PLC, the motion realizing exploring electrode is visual controlled, effectively avoid passive wait liquid level to change and carry out the defect measured, and contact and disengaged position are converted to the height value of liquid level, controllability is high, guarantees the real-time detection that liquid level changes; By the integration of flow, the value of the change of effective calculated flow rate in sense cycle, and by correction factor update the system error, the balance of smelting furnace turnover amount to greatest extent, keep the continual and steady of liquid level, guarantee in smelting furnace technical indicator reach technological requirement, improve the output of product and qualification rate, rejection rate is low.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of liquid level detection system in the present invention.
As shown in Figure 1, wherein corresponding Reference numeral name is called:
1 Level meter, 2 exploring electrodes, 3 conductive soleplates, 4 touch-screens, 5DSC control system, 6PLC, 7 chargers, 8 step actuators, 9 exploring electrode auxiliary bodies.
Fig. 2 is the structural representation of exploring electrode auxiliary body in liquid level detection system in the present invention.
As shown in Figure 2, wherein corresponding Reference numeral name is called:
11 bracing frames, 12 dust cover, 13 polished rods, 14 screw mandrels, 15 proximity switches, 16 stepper motors, 17 cantilevers.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated.
The detection of pyrosol liquid level and a control method, described detection and control method realize based on liquid level detection system, and it comprises:
A, bottom pyrosol kiln, be provided with conductive soleplate 3 for emitting radio waves signal, above high-temp liquid, be provided with the exploring electrode 2 for sampling to electric wave signal;
B, control exploring electrode 2 are mobile near high-temp liquid surface, until when exploring electrode 2 touches high-temp liquid, exploring electrode 2 starts sampling and obtains activation signal;
C, control exploring electrode 2 are mobile away from high-temp liquid surface, until when exploring electrode 2 leaves high-temp liquid, exploring electrode 2 starts sampling and obtains the signal that comes off;
Activation signal in d, Level meter 1 receiving step b and the separating signal in step c, and transfer signals to PLC 6;
E, PLC 6 processes and obtains liquid level;
F, based on the liquid level obtained in step e, to pass through
obtain reinforced frequency, wherein f1 is the reinforced frequency of current time, ρ is the density of high temperature Irish touchstone solution, the area that the liquid level that s is high temperature kiln can cover, hset is the setting value of liquid level, h1 is current liquid level, h0 was the liquid level in a upper moment, Q1 is that the last detection moment is to the current calculating flow in moment and the function of time, Q0 detected the moment supreme flow in one-time detection moment and the function of time upper last time, f0 is last reinforced frequency, k is correction factor, described correction factor is specially the slope of the feeding quantity of unit interval, the numerical range of k is that 0.1-2 is (preferred, the numerical value of k can select 1, 1.5 etc.) acting as by setting revisory coefficient, along with the wearing and tearing of charger can cause the change of feeding quantity in later stage use procedure, now can revise k to reach the object of the reinforced frequency of adjustment,
G, PLC 6 feeds in raw material based on the reinforced frequency control charger obtained in step f.
Liquid level detection system is as illustrated in fig. 1 and 2 by Level meter 1, exploring electrode 2, conductive soleplate 3, PLC 6, charger 7 and step actuator 8 and exploring electrode auxiliary body 9 form, described PLC 6 respectively with Level meter 1, step actuator 8 and charger 7 are electrically connected, institute's Level meter 1 is electrically connected with exploring electrode 2 and conductive soleplate 3 respectively, described exploring electrode auxiliary body 9 respectively with exploring electrode 2 and step actuator 8, described exploring electrode auxiliary body 9 is by bracing frame 11, straight line module, proximity switch 15, stepper motor 16, cantilever 17 forms, described straight line module is arranged on the upper end of bracing frame 11, described stepper motor 16 is arranged on the top of straight line module, described cantilever 17 is arranged on straight line module, the end that described cantilever 17 is connected with straight line module at it is provided with proximity switch 15, described cantilever 17 other end is provided with exploring electrode 2, described stepper motor 16 is electrically connected by common insulated conductor with step actuator 8, described straight line module is by dust cover 12, polished rod 13 and screw mandrel 14 form, described screw mandrel 14 is arranged on polished rod 13, described dust cover 12 is arranged on the lower end of polished rod 14, described screw mandrel 14 is connected with described stepper motor 16, switched by auxiliary reclay between described stepper motor 16 and step actuator 8, described auxiliary reclay is electrically connected with PLC 3, described stepper motor 16 is servomotor, described cantilever 17 is made up of aluminium alloy extrusions, described cantilever 17 two ends are respectively equipped with pagoda mouth, described cantilever 17 is connected with exploring electrode 2 by fixed connecting plate, described PLC 3 is electrically connected with touch-screen 4 and DCS control system 5 respectively.
The principle of work of native system is as follows:
System install after first time detection need exploring electrode 2 to return initial point (seeking initial point), correct search out initial point after then can start formal detection mission.After detection mission starts, PLC 6 control step driver 8, step actuator 8 control step motor 16, stepper motor 16 controls screw mandrel 14, and screw mandrel 14 drives cantilever 17 to move, and cantilever 17 connects exploring electrode 2 and moves toward liquid level direction; The simultaneously contact separating signal sent back by Level meter 1 of PLC6 Real-time Collection, when liquid level activation signal arrives, exploring electrode 2 is allowed to move toward the direction away from liquid level at once, until get back to initial point, after getting back to initial point, whether PLC6 calculates whole detection process normal, and calculate and display liquid level, whole detection mission terminates, and System recover, to armed state, waits detection mission next time to be launched.
Above embodiment is described in detail to essence of the present invention; but can not limit protection scope of the present invention; apparently; under enlightenment of the present invention; the art those of ordinary skill can also carry out many improvement and modification; it should be noted that these improve and modify all to drop within claims of the present invention.
Claims (8)
1. the detection of pyrosol liquid level and a control method, described detection and control method realize based on liquid level detection system, and it is characterized in that, it comprises:
A, bottom pyrosol kiln, be provided with conductive soleplate (3) for emitting radio waves signal, above high-temp liquid, be provided with the exploring electrode (2) for sampling to electric wave signal;
B, control exploring electrode (2) are moved near high-temp liquid surface, until when exploring electrode (2) touches high-temp liquid, exploring electrode (2) starts sampling and obtains activation signal;
C, control exploring electrode (2) are moved away from high-temp liquid surface, until when exploring electrode (2) leaves high-temp liquid, exploring electrode (2) starts sampling and obtains the signal that comes off;
Activation signal in d, Level meter (1) receiving step b and the separating signal in step c, and transfer signals to PLC (6);
E, PLC (6) process obtains liquid level;
F, based on the liquid level obtained in step e, to pass through
obtain reinforced frequency, wherein f1 is the reinforced frequency of current time, ρ is the density of high temperature Irish touchstone solution, the area that the liquid level that s is high temperature kiln can cover, hset is the setting value of liquid level, h1 is current liquid level, h0 was the liquid level in a upper moment, Q1 is that the last detection moment is to the current calculating flow in moment and the function of time, Q0 detected the moment supreme flow in one-time detection moment and the function of time upper last time, f0 is last reinforced frequency, and k is correction factor;
G, PLC (6) feed in raw material based on the reinforced frequency control charger obtained in step f.
2. the detection of pyrosol liquid level according to claim 1 and control method, it is characterized in that described liquid level detection system is by Level meter (1), exploring electrode (2), conductive soleplate (3), PLC (6), charger (7) and step actuator (8) and exploring electrode auxiliary body (9) composition, described PLC (6) respectively with Level meter (1), step actuator (8) and charger (7) electrical connection, institute's Level meter (1) is electrically connected with exploring electrode (2) and conductive soleplate (3) respectively, described exploring electrode auxiliary body (9) respectively with exploring electrode (2) and step actuator (8).
3. the detection of pyrosol liquid level according to claim 2 and control method, it is characterized in that described exploring electrode auxiliary body (9) is by bracing frame (11), straight line module, proximity switch (15), stepper motor (16), cantilever (17) forms, described straight line module is arranged on the upper end of bracing frame (11), described stepper motor (16) is arranged on the top of straight line module, described cantilever (17) is arranged on straight line module, described cantilever (17) is provided with proximity switch (15) in the end that it is connected with straight line module, described cantilever (17) other end is provided with exploring electrode (2), described stepper motor (16) is electrically connected by common insulated conductor with step actuator (8).
4. the detection of pyrosol liquid level according to claim 3 and control method, it is characterized in that described straight line module is made up of dust cover (12), polished rod (13) and screw mandrel (14), described screw mandrel (14) is arranged on polished rod (13), described dust cover (12) is arranged on the lower end of polished rod (14), and described screw mandrel (14) is connected with described stepper motor (16).
5. the detection of pyrosol liquid level according to claim 3 and control method, it is characterized in that being switched by auxiliary reclay between described stepper motor (16) and step actuator (8), described auxiliary reclay is electrically connected with PLC (3).
6. the detection of the pyrosol liquid level according to any one of claim 3-4 claim and control method, is characterized in that described stepper motor (16) is servomotor.
7. the detection of pyrosol liquid level according to claim 2 and control method, it is characterized in that described cantilever (17) is made up of aluminium alloy extrusions, described cantilever (17) two ends are respectively equipped with pagoda mouth, and described cantilever (17) is connected with exploring electrode (2) by fixed connecting plate.
8. the detection of pyrosol liquid level according to claim 2 and control method, is characterized in that described PLC (3) is electrically connected with touch-screen (4) and DCS control system (5) respectively.
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| CN109164840A (en) * | 2018-04-25 | 2019-01-08 | 西安麦特沃金液控技术有限公司 | A kind of tank level control system and method |
| CN109099988A (en) * | 2018-06-21 | 2018-12-28 | 张丰麒 | A kind of level sensing charger |
| CN112683361A (en) * | 2019-10-19 | 2021-04-20 | 南京晨全机械制造有限公司 | Be applied to liquid level detection device's a lot of measuring mechanism |
| CN112683361B (en) * | 2019-10-19 | 2024-04-12 | 南京晨全机械制造有限公司 | Multi-time measuring mechanism applied to liquid level detection device |
| CN111256779A (en) * | 2020-01-19 | 2020-06-09 | 太原理工大学 | System and method for detecting interface position of melt in melting furnace based on thermal radiation theory |
| CN111256779B (en) * | 2020-01-19 | 2022-02-11 | 太原理工大学 | System and method for detecting interface position of melt in melting furnace based on thermal radiation theory |
| CN112304393B (en) * | 2020-10-28 | 2023-08-08 | 浙江传媒学院 | Liquid level measuring device and method, oiling machine verification system and method |
| CN112304393A (en) * | 2020-10-28 | 2021-02-02 | 浙江传媒学院 | Liquid level measuring device and method and oiling machine verification system and method |
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