CN104308991A - Foam concrete density automatic control system and method based on PLC technology - Google Patents
Foam concrete density automatic control system and method based on PLC technology Download PDFInfo
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- CN104308991A CN104308991A CN201410443549.8A CN201410443549A CN104308991A CN 104308991 A CN104308991 A CN 104308991A CN 201410443549 A CN201410443549 A CN 201410443549A CN 104308991 A CN104308991 A CN 104308991A
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- 239000011381 foam concrete Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005516 engineering process Methods 0.000 title claims abstract description 26
- 239000006260 foam Substances 0.000 claims abstract description 95
- 238000005187 foaming Methods 0.000 claims abstract description 58
- 239000002002 slurry Substances 0.000 claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 238000000892 gravimetry Methods 0.000 claims description 22
- 230000009471 action Effects 0.000 claims description 8
- 230000003993 interaction Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract 2
- 230000008569 process Effects 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 8
- 238000005259 measurement Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 239000004567 concrete Substances 0.000 description 4
- 239000004088 foaming agent Substances 0.000 description 4
- 235000014676 Phragmites communis Nutrition 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/02—Controlling the operation of the mixing
- B28C7/022—Controlling the operation of the mixing by measuring the consistency or composition of the mixture, e.g. with supply of a missing component
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention discloses a foam concrete density automatic control system and method based on a PLC technology. The control system is connected to foam concrete foaming production equipment, and comprises a control facility, an execution facility, and a display facility; wherein the control facility comprises a center controller and an online density determinator, the execution facility comprises a foam maker, a compressed air supplier, and a foaming liquid supplier, and the compressed air supplier and the foaming liquid supplier are connected to the foam maker. The foam concrete slurry wet-density in a pipe can be measured in real time, then the measured value is compared with an artificially-set theoretical wet-density value, then the air content of the foam concrete slurry is self-adaptively adjusted and controlled so as to reach the artificially-set theoretical wet-density value, and the online density is displayed in real time on a display. The provided system and method have the advantages of simple structure, automatic adjustment, high efficiency, and convenient operation.
Description
Technical field
The present invention relates to foam concrete foaming production equipment technical field, particularly relate to the foam concrete Density Automatic Control System based on PLC technology and method.
Background technology
At present, in field of civil engineering, the construction materials such as foam concrete, lightweight foam soil, air bubble mix light-textured soil, Foam lightweight soil are adopted in a large number, so the foaming production equipment of foam concrete, also serves more and more important effect, it is as the construction machinery in architectural engineering and municipal works field, in roadbase backfill engineering, cavity, foundation ditch infilling work, the foam concrete heat-preserving of building energy saving field, look in the engineerings such as slope, bed course, filling obtaining and apply more and more widely.
The patent of invention that application number is 201310232973.3 provides a kind of foam concrete foaming machine and foaming method thereof, belongs to technical field of concrete preparation.This foaming machine comprises foaming chamber, plenum chamber, bubble cutting stirring system, air compressor machine, air accumulator, pressure-air air distribution system, makes bubble gas pipeline, blows foam gas pipeline, foaming agent solution reservoir, foam blow pipeline and foaming agent solution delivery line.The aperture of the foam that foaming machine of the present invention generates is tiny, even, and bubble diameter is controlled, and therefore obtained foam concrete has the gap structure of fine uniform, has than the better mechanics of other foaming machine foamed concretes and thermal property.
Application number be 201020163509.5 utility model patent provide a kind of foam concrete Special agitating, foaming, mixing, conveying integrated machine, by body frame, mixer and giving out a contract for a project, mixing, conveying integrated machine and axis of traction are formed, it is characterized in that: at body frame 1 equipment two time frame 2-1 side by side, 2-2, body frame welds with time frame, secondary frame 2-1 installs mixer A, secondary frame 2-2 installs and stirs, foaming, mixing, conveying integrated machine B, 2 wheels 31 are had at mainframe, wheel by wheel shaft and body frame 1 hinged, axis of traction 30 welds with body frame 1, it is even that this machinery can accomplish to produce cement based slurry in inorganic foamed porous light-weight material, transport continuously, product match ratio accurately and stable performance, can accomplish to ensure product quality, and it is easy to operate, automaticity is high, operating efficiency is high, energy consumption is low, dependable performance, building trade can be widely used in.
Application number be 201120261039.0 practical information patent relate to a kind of air blast foaming machine of light foam concrete, it is characterized in that: in case, side dress end face has the fluid reservoir of the foaming agent solution entering pipe, in case, opposite side mounting height is not etc., multiple foaming storehouses that external diameter is different, the general export pipe of case internal upper part dress foam, the top mouth in its each foaming storehouse is connected with foam outlet arm bottom, this top is connected on general export pipe, feed tube is filled between its each foaming storehouse and fluid reservoir, air inlet pipe dress magnetic valve at the bottom of each foaming storehouse, by this air compressor machine, the compressed air with 0.25MPa ~ 0.40MPa pressure is sent in foaming storehouse, the foaming agent solution applied pressure in foaming storehouse realizes pneumatic flushing foaming.The utility model is not only reasonable in design; compact conformation; both the foaming quality of bubble had been improved; the different bubble diameter that can foam out again realizes a tractor serves several purposes; both be applicable to scale continuous seepage, high performance foam concrete can be produced again, and automaticity be high; favorable reproducibility, the advantages such as energy-conservation and use is very convenient.
Said method or device, its object is all the improvement to foam concrete foaming machine and foaming technique, but due to differences such as equipment, raw material, proportionings, in foam concrete preparation process, often occur compound skewness, the situation that density variation is larger, density stability directly affects the unit weight intensity in material later stage, thermal conductivity factor and elastic modelling quantity, so in foaming process, need a kind of foam concrete density control system that can realize automatically regulating.
Summary of the invention
The object of the invention is to provide the foam concrete Density Automatic Control System based on PLC technology and method, what mainly solve is that conventional foam concrete foaming production equipment is being prepared in foam concrete process, interior air containing ratio cannot be starched by real-time adaptive control bubble, cause the technical problem that foam concrete density is inaccurate, discharging is unstable.
For achieving the above object, the technical solution used in the present invention is: based on the foam concrete Density Automatic Control System of PLC technology, be connected with foam concrete foaming production equipment, comprise control appliance, actuating equipment and display device, described control appliance comprises central controller and online gravimetry instrument, the compressed air supply that described actuating equipment comprises foam maker and is connected with described foam maker respectively, expanding foam solution supply, described central controller respectively with described display device, described online gravimetry instrument, described compressed air supply, described expanding foam solution supply connects, described foam maker is connected with the discharge pipe of described foam concrete foaming production equipment respectively with described online gravimetry instrument.
Described compressed air supply comprises interconnective compressed air draft machine and compressed air frequency-variable controller, and described compressed air draft machine connects described foam maker, and described compressed air frequency-variable controller connects described central controller.
Described expanding foam solution supply comprises interconnective expanding foam solution draft machine and expanding foam solution frequency-variable controller, and described expanding foam solution draft machine connects described foam maker, and described expanding foam solution frequency-variable controller connects described central controller.
Described central controller is PLC arithmetic and control unit, and described display device is the touch screen displays with human-computer interaction function.
Described online gravimetry instrument gathers the slurry wet density value in the discharge pipe of described foam concrete foaming production equipment, and passes to PLC arithmetic and control unit in real time.
Described PLC arithmetic and control unit is inputted density or the parameter such as match ratio of setting by touch screen displays by operating personnel, and via controller computing, adjust difference to compare with real-time density in pipeline, shows online real-time density on a touch-screen display.
Described central controller contrast pipeline, after line density with setting density, is assigned instruction to compressed air frequency-variable controller, is accelerated frequency or the frequency that slows down, and then control the gas output of compressed air draft machine.
Described central controller contrast pipeline, after line density with setting density, is assigned instruction to expanding foam solution frequency-variable controller, is accelerated frequency or the frequency that slows down, and then control the expanding foam solution supply of expanding foam solution draft machine.
Based on the foam concrete density autocontrol method of PLC technology, core is PLC arithmetic and control unit, comprise the steps: that online gravimetry instrument collects sensor tube slurry wet density value, be designated as X, and the theoretical slurry wet density value R set by PLC arithmetic and control unit contrasts, compare R and X size and calculated difference, in comparison procedure, set with the foaming frequency values under normal operating condition as initial frequency value;
When the absolute difference of X and R is less than/equals 25Kg/m
3time, PLC arithmetic and control unit does not carry out output action;
When X is larger than R, and difference is greater than 25Kg/m
3, be less than/equal 50Kg/m
3time, foaming frequency increases by 1 times than original frequency;
When X is larger than R, and difference is greater than 50Kg/m
3time, foaming frequency increases 3-5 doubly than original frequency;
When R is larger than X, and difference is greater than 25Kg/m
3, be less than/equal 50Kg/m
3time, foaming frequency reduces by 1 times than original frequency;
When R is larger than X, and difference is greater than 50Kg/m
3time, foaming frequency reduces 3-5 doubly than original frequency;
After each relatively also adjustment, all return initial comparison program, until regulable control completes.
Control core of the present invention is to control the foam charge in foam concrete slurry, the air containing ratio in regulable control foam concrete slurry is carried out with this, thus reed time controll makes the density of foam concrete reach setting value, its concrete operations are: by PLC arithmetic and control unit, by controlling the frequency of compressed air frequency-variable controller and expanding foam solution frequency-variable controller, and then control the output quantity of compressed air draft machine, expanding foam solution draft machine, by co-ordination, increase or reduce the generation of foam in foam maker.
Due to the present invention design in logical relation and uncomplicated, in order to more adapt to suitability for industrialized production, PLC is as a kind of digital electronic device with microprocessor function, compare single-chip microcomputer or the DSP control system of price on year-on-year basis, there are better anti-interference and stability, during digital logical operation in particular for Automated condtrol, control instruction can be loaded at any time in internal memory and store and perform.PLC arithmetic and control unit is generally by innernal CPU, and instruction and data internal memory, input-output unit, power supply module, digital simulation unit are formed by combining.
The display of human-computer interaction function, be to provide between staff and PLC and transmit, the medium of exchange information and dialog interface, between system and user, carry out medium that is mutual and information exchange, it realizes the conversion that the internal form of information and the mankind can accept between form, on the one hand to the real-time sampling value in online gravimetry instrument and and the comparative result of setting value show, on the other hand, interactive interface can realize the controllability of parameter, for staff in chief commander's theoretical value input PLC arithmetic and control unit, avoid parameter in PLC non-adjustable and cause the scope of application narrow, the problems such as function singleness, increase its intelligent and adaptability, simultaneously, touch design makes setting convenient, operate Simple visual more.
The invention discloses a kind of foam concrete Density Automatic Control System based on PLC technology and method, by foam concrete slurry wet density in the pipeline of the real time measure, contrast with the theoretical wet density manually set, air containing ratio in adaptivity regulable control foam concrete slurry, the wet density carrying out reed time controll foam concrete reaches artificial setting value, and be presented at line density in real time by display, there is the advantages such as structure regulates simply, automatically, efficiency is high and easy to operate.
Accompanying drawing explanation
Fig. 1 is system construction drawing of the present invention.
Fig. 2 is the control principle drawing of central controller of the present invention.
Detailed description of the invention
As Fig. 1, shown in Fig. 2, based on the foam concrete Density Automatic Control System of PLC technology, be connected with foam concrete foaming production equipment, comprise control appliance, actuating equipment 4 and display device 2, control appliance comprises central controller 1 and online gravimetry instrument 3, the compressed air supply that actuating equipment 4 comprises foam maker 9 and is connected with foam maker 9 respectively, expanding foam solution supply, central controller 1 respectively with display device 2, online gravimetry instrument 3, compressed air supply, expanding foam solution supply connects, foam maker 9 is connected with the discharge pipe 10 of foam concrete foaming production equipment respectively with online gravimetry instrument 3.
Compressed air supply comprises interconnective compressed air draft machine 8 and compressed air frequency-variable controller 7, and compressed air draft machine 8 connects foam maker 9, and compressed air frequency-variable controller 7 connects central controller 1; Expanding foam solution supply comprises interconnective expanding foam solution draft machine 6 and expanding foam solution frequency-variable controller 5, and expanding foam solution draft machine 6 connects foam maker 9, and expanding foam solution frequency-variable controller 5 connects central controller 1; Central controller 1 is PLC arithmetic and control unit, and display device 2 is for having the touch screen displays of human-computer interaction function; Online gravimetry instrument 3 gathers the slurry wet density value in the discharge pipe 10 of foam concrete foaming production equipment, and passes to PLC arithmetic and control unit in real time.
PLC arithmetic and control unit is inputted density or the parameter such as match ratio of setting by touch screen displays by operating personnel, and via controller computing, adjust difference to compare with real-time density in pipeline, shows online real-time density on a touch-screen display; Central controller 1 contrasts pipeline after line density with setting density, assigns instruction, accelerates frequency or the frequency that slows down, and then control the gas output of compressed air draft machine 8 to compressed air frequency-variable controller 7; Central controller 1 contrasts pipeline after line density with setting density, assigns instruction, accelerates frequency or the frequency that slows down, and then control the expanding foam solution supply of expanding foam solution draft machine 6 to expanding foam solution frequency-variable controller 5.
Control core of the present invention is to control the foam charge in foam concrete slurry, the air containing ratio in regulable control foam concrete slurry is carried out with this, thus reed time controll makes the density of foam concrete reach setting value, its concrete operations are: by PLC arithmetic and control unit, by controlling the frequency of compressed air frequency-variable controller 7 and expanding foam solution frequency-variable controller 5, and then control the output quantity of compressed air draft machine 8, expanding foam solution draft machine 6, by co-ordination, increase or reduce the generation of foam in foam maker 9.Foam concrete Density Automatic Control System based on PLC technology provided by the present invention, the core of its control method is PLC arithmetic and control unit, online gravimetry instrument 3 collects sensor tube slurry wet density value, and the theoretical slurry wet density value set by PLC arithmetic and control unit contrasts, size relatively calculated difference, in comparison procedure, set with the foaming frequency values under normal operating condition as initial frequency value; Concrete adjustment process is embodied by following examples.
Embodiment one
Based on the foam concrete Density Automatic Control System of PLC technology, system starts runs, online gravimetry instrument 3 collects sensor tube slurry wet density value, be designated as X, and by PLC arithmetic and control unit, theoretical slurry wet density value R set by contrast, compare R and X size and calculated difference, PLC arithmetic and control unit, by controlling the frequency of compressed air frequency-variable controller 7 and expanding foam solution frequency-variable controller 5, and then control compressed air draft machine 8, the output quantity of expanding foam solution draft machine 6, pass through co-ordination, increase or reduce the generation of foam in foam maker 9, in comparison procedure, set with the foaming frequency values under normal operating condition as initial frequency value.
In the present embodiment, the theoretical slurry wet density value R of setting is 600Kg/m
3, and in testing result, actual measurement slurry wet density value X is 680Kg/m
3, now, X is larger than R, and difference is greater than 50Kg/m
3time, PLC arithmetic and control unit, just according to setting, controls compressed air supply and expanding foam solution supply, makes foaming frequency increase 3-5 doubly than original frequency, and returns initial comparison program continuation monitoring; When actual measurement slurry wet density value X reduces to 650Kg/m
3time, X is still large than R, but its difference is greater than 25Kg/m
3, be less than/equal 50Kg/m
3, PLC arithmetic and control unit, just according to setting, controls compressed air supply and expanding foam solution supply, makes foaming frequency increase by 1 times than original frequency, and returns initial comparison program continuation monitoring; When the absolute difference of X and R is less than/equals 25Kg/m
3time, PLC arithmetic and control unit does not carry out output action, and so far, adjustment process terminates, and system is in the monitor and detection stage.
Embodiment two
Based on the foam concrete Density Automatic Control System of PLC technology, system starts runs, online gravimetry instrument 3 collects sensor tube slurry wet density value, be designated as X, and by PLC arithmetic and control unit, theoretical slurry wet density value R set by contrast, compare R and X size and calculated difference, PLC arithmetic and control unit, by controlling the frequency of compressed air frequency-variable controller 7 and expanding foam solution frequency-variable controller 5, and then control compressed air draft machine 8, the output quantity of expanding foam solution draft machine 6, pass through co-ordination, increase or reduce the generation of foam in foam maker 9, in comparison procedure, set with the foaming frequency values under normal operating condition as initial frequency value.
In the present embodiment, the theoretical slurry wet density value R of setting is 600Kg/m
3, and in testing result, actual measurement slurry wet density value X is 510Kg/m
3, now, R is larger than X, and difference is greater than 50Kg/m
3time, PLC arithmetic and control unit, just according to setting, controls compressed air supply and expanding foam solution supply, makes foaming frequency reduce 3-5 doubly than original frequency, and returns initial comparison program continuation monitoring; When actual measurement slurry wet density value X is upgraded to 550Kg/m
3time, R is still large than X, but its difference is greater than 25Kg/m
3, be less than/equal 50Kg/m
3, PLC arithmetic and control unit, just according to setting, controls compressed air supply and expanding foam solution supply, makes foaming frequency reduce by 1 times than original frequency, and returns initial comparison program continuation monitoring; When the absolute difference of X and R is less than/equals 25Kg/m
3time, PLC arithmetic and control unit does not carry out output action, and so far, adjustment process terminates, and system is in the monitor and detection stage.
Embodiment three
Based on the foam concrete Density Automatic Control System of PLC technology, system starts runs, online gravimetry instrument 3 collects sensor tube slurry wet density value, be designated as X, and by PLC arithmetic and control unit, theoretical slurry wet density value R set by contrast, compare R and X size and calculated difference, PLC arithmetic and control unit, by controlling the frequency of compressed air frequency-variable controller 7 and expanding foam solution frequency-variable controller 5, and then control compressed air draft machine 8, the output quantity of expanding foam solution draft machine 6, pass through co-ordination, increase or reduce the generation of foam in foam maker 9, in comparison procedure, set with the foaming frequency values under normal operating condition as initial frequency value.
In the present embodiment, the theoretical slurry wet density value R of setting is 600Kg/m
3, and in testing result, actual measurement slurry wet density value X is 640Kg/m
3, now, X is larger than R, and its difference is greater than 25Kg/m
3, be less than/equal 50Kg/m
3, PLC arithmetic and control unit, just according to setting, controls compressed air supply and expanding foam solution supply, makes foaming frequency increase by 1 times than original frequency, and returns initial comparison program continuation monitoring; When the absolute difference of X and R is less than/equals 25Kg/m
3time, PLC arithmetic and control unit does not carry out output action, and so far, adjustment process terminates, and system is in the monitor and detection stage.
Embodiment four
Based on the foam concrete Density Automatic Control System of PLC technology, system starts runs, online gravimetry instrument 3 collects sensor tube slurry wet density value, be designated as X, and by PLC arithmetic and control unit, theoretical slurry wet density value R set by contrast, compare R and X size and calculated difference, PLC arithmetic and control unit, by controlling the frequency of compressed air frequency-variable controller 7 and expanding foam solution frequency-variable controller 5, and then control compressed air draft machine 8, the output quantity of expanding foam solution draft machine 6, pass through co-ordination, increase or reduce the generation of foam in foam maker 9, in comparison procedure, set with the foaming frequency values under normal operating condition as initial frequency value.
In the present embodiment, the theoretical slurry wet density value R of setting is 600Kg/m
3, and in testing result, actual measurement slurry wet density value X is 570Kg/m
3, now, R is larger than X, and its difference is greater than 25Kg/m
3, be less than/equal 50Kg/m
3, PLC arithmetic and control unit, just according to setting, controls compressed air supply and expanding foam solution supply, makes foaming frequency reduce by 1 times than original frequency, and returns initial comparison program continuation monitoring; When the absolute difference of X and R is less than/equals 25Kg/m
3time, PLC arithmetic and control unit does not carry out output action, and so far, adjustment process terminates, and system is in the monitor and detection stage.
Embodiment five
Based on the foam concrete Density Automatic Control System of PLC technology, system starts runs, online gravimetry instrument 3 collects sensor tube slurry wet density value, be designated as X, and by PLC arithmetic and control unit, theoretical slurry wet density value R set by contrast, compare R and X size and calculated difference, PLC arithmetic and control unit, by controlling the frequency of compressed air frequency-variable controller 7 and expanding foam solution frequency-variable controller 5, and then control compressed air draft machine 8, the output quantity of expanding foam solution draft machine 6, pass through co-ordination, increase or reduce the generation of foam in foam maker 9, in comparison procedure, set with the foaming frequency values under normal operating condition as initial frequency value.
In the present embodiment, the theoretical slurry wet density value R of setting is 600Kg/m
3, and in testing result, actual measurement slurry wet density value X is 580Kg/m
3, now, R is larger than X, and its difference is less than 25Kg/m
3, PLC arithmetic and control unit do not carry out output action, so far, adjustment process does not occur, system is still in the monitor and detection stage.
Embodiment six
Based on the foam concrete Density Automatic Control System of PLC technology, system starts runs, online gravimetry instrument 3 collects sensor tube slurry wet density value, be designated as X, and by PLC arithmetic and control unit, theoretical slurry wet density value R set by contrast, compare R and X size and calculated difference, PLC arithmetic and control unit, by controlling the frequency of compressed air frequency-variable controller 7 and expanding foam solution frequency-variable controller 5, and then control compressed air draft machine 8, the output quantity of expanding foam solution draft machine 6, pass through co-ordination, increase or reduce the generation of foam in foam maker 9, in comparison procedure, set with the foaming frequency values under normal operating condition as initial frequency value.
In the present embodiment, the theoretical slurry wet density value R of setting is 600Kg/m
3, and in testing result, actual measurement slurry wet density value X is 620Kg/m
3, now, X is larger than R, and its difference is less than 25Kg/m
3, PLC arithmetic and control unit do not carry out output action, so far, adjustment process does not occur, system is still in the monitor and detection stage.
Claims (9)
1. based on the foam concrete Density Automatic Control System of PLC technology, be connected with foam concrete foaming production equipment, it is characterized in that: comprise control appliance, actuating equipment and display device, described control appliance comprises central controller and online gravimetry instrument, the compressed air supply that described actuating equipment comprises foam maker and is connected with described foam maker respectively, expanding foam solution supply, described central controller respectively with described display device, described online gravimetry instrument, described compressed air supply, described expanding foam solution supply connects, described foam maker is connected with the discharge pipe 10 of described foam concrete foaming production equipment respectively with described online gravimetry instrument.
2. as claimed in claim 1 based on the foam concrete Density Automatic Control System of PLC technology, it is characterized in that: described compressed air supply comprises interconnective compressed air draft machine and compressed air frequency-variable controller, described compressed air draft machine connects described foam maker, and described compressed air frequency-variable controller connects described central controller.
3. as claimed in claim 1 based on the foam concrete Density Automatic Control System of PLC technology, it is characterized in that: described expanding foam solution supply comprises interconnective expanding foam solution draft machine and expanding foam solution frequency-variable controller, described expanding foam solution draft machine connects described foam maker, and described expanding foam solution frequency-variable controller connects described central controller.
4., as claimed in claim 1 based on the foam concrete Density Automatic Control System of PLC technology, it is characterized in that: described central controller is PLC arithmetic and control unit, described display device is the touch screen displays with human-computer interaction function.
5. as claimed in claim 4 based on the foam concrete Density Automatic Control System of PLC technology, it is characterized in that: described online gravimetry instrument gathers the slurry wet density value in the discharge pipe of described foam concrete foaming production equipment, and passes to PLC arithmetic and control unit in real time.
6. as claimed in claim 4 based on the foam concrete Density Automatic Control System of PLC technology, it is characterized in that: described PLC arithmetic and control unit is inputted density or the parameter such as match ratio of setting by touch screen displays by operating personnel, and in via controller computing, tune difference and pipeline, real-time density is compared, and shows online real-time density on a touch-screen display.
7. as claimed in claim 2 based on the foam concrete Density Automatic Control System of PLC technology, it is characterized in that: described central controller contrast pipeline is after line density with setting density, instruction is assigned to compressed air frequency-variable controller, accelerate frequency or the frequency that slows down, and then control the gas output of compressed air draft machine.
8. as claimed in claim 3 based on the foam concrete Density Automatic Control System of PLC technology, it is characterized in that: described central controller contrast pipeline is after line density with setting density, instruction is assigned to expanding foam solution frequency-variable controller, accelerate frequency or the frequency that slows down, and then control the expanding foam solution supply of expanding foam solution draft machine.
9. based on the foam concrete density autocontrol method of PLC technology, core is PLC arithmetic and control unit, comprise the steps: that online gravimetry instrument collects sensor tube slurry wet density value, be designated as X, and the theoretical slurry wet density value R set by PLC arithmetic and control unit contrasts, compare R and X size and calculated difference, in comparison procedure, set with the foaming frequency values under normal operating condition as initial frequency value;
When the absolute difference of X and R is less than/equals 25Kg/m
3time, PLC arithmetic and control unit does not carry out output action;
When X is larger than R, and difference is greater than 25Kg/m
3, be less than/equal 50Kg/m
3time, foaming frequency increases by 1 times than original frequency;
When X is larger than R, and difference is greater than 50Kg/m
3time, foaming frequency increases 3-5 doubly than original frequency;
When R is larger than X, and difference is greater than 25Kg/m
3, be less than/equal 50Kg/m
3time, foaming frequency reduces by 1 times than original frequency;
When R is larger than X, and difference is greater than 50Kg/m
3time, foaming frequency reduces 3-5 doubly than original frequency;
After each relatively also adjustment, all return initial comparison program, until regulable control completes.
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| CN201410443549.8A CN104308991A (en) | 2014-09-03 | 2014-09-03 | Foam concrete density automatic control system and method based on PLC technology |
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| CN201410443549.8A CN104308991A (en) | 2014-09-03 | 2014-09-03 | Foam concrete density automatic control system and method based on PLC technology |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991578A (en) * | 2015-06-30 | 2015-10-21 | 南阳中衡智能科技有限公司 | Far-end outlet foam concrete density remoter real-time monitoring system and method |
| CN107362742A (en) * | 2017-07-28 | 2017-11-21 | 阳信诺瑞织品有限公司 | A kind of carpet three proofings foaming machine |
| CN108501216A (en) * | 2018-03-01 | 2018-09-07 | 镇江北新建材有限公司 | Plasterboard foaming mixing equipment and method for mixing |
| CN113504151A (en) * | 2021-06-10 | 2021-10-15 | 中国核电工程有限公司 | Device and method for measuring foam mixing ratio of foam fire-fighting system based on density method |
| CN113927743A (en) * | 2021-10-27 | 2022-01-14 | 厦门理工学院 | Method and system for preparing foamed concrete |
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| CN113927743A (en) * | 2021-10-27 | 2022-01-14 | 厦门理工学院 | Method and system for preparing foamed concrete |
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