CN1432809A - Instant slump measuring system for freshly produced concrete - Google Patents
Instant slump measuring system for freshly produced concrete Download PDFInfo
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- CN1432809A CN1432809A CN 02100704 CN02100704A CN1432809A CN 1432809 A CN1432809 A CN 1432809A CN 02100704 CN02100704 CN 02100704 CN 02100704 A CN02100704 A CN 02100704A CN 1432809 A CN1432809 A CN 1432809A
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Abstract
An instant slump measuring system for freshly produced concrete includes a sensor to detect the current and voltage change of motor for concrete stirrer, and an industrial PC to calculate and display change curve, which is compared with ideal curve set in advance to obtain slump value of freshly produced concrete. By means of monitoring and analyzing the load current to obtain slump value while eliminating the effect of voltage chnage, concrete kind and stirred concrete amount, the slump value of freshly produced concrete can be real-time measured and this can avoid loss.
Description
Technical field
Instant slump measuring system when the present invention relates to a kind of fresh concrete and produces, referring in particular to a kind ofly can influence the mixer load current by degree of collapsing variation on the coagulation in mixing and stirring and change to make and can make the instant slump measurement system that fresh concrete can its degree of collapsing value of instant playback when the production.
Background technology
With regard to the concrete premixing industry, it is considerable how effectively controlling the fresh concrete degree of collapsing that produces, and degree of collapsing is not enough and will have a strong impact on the intensity of finished product in the future too much.Wherein as shown in figure 16, it is degree of the collapsing awl 7 of degree of collapsing test, this degree of collapsing awl 7 is a up-small and down-big frustum of a cone, both sides are provided with carrying handle 71, and degree of collapsing awl 7 is placed on the plane, insert concrete and layering tamping at top round mouth 72 again and fill up whole degree of collapsing awl 7, utilizing carrying handle 71 that the whole awl 7 that collapses is up carried (as shown in figure 17) again, to be placed on coagulation mound 73 other, getting a mark post 74 is placed on the round mouth 72 horizontal, directly measure and the difference in height h (as shown in figure 18) on concrete top with gage 75, this difference in height is " degree of collapsing " again.The method of utilizing this kind degree of collapsing to measure can't be learnt the concrete degree of collapsing in mixing and stirring immediately.
Summary of the invention
Instant slump measuring system when the object of the present invention is to provide a kind of fresh concrete to produce, load current value (or performance number) by the monitoring analysis mixer is judged degree of collapsing value, and overcome variation in voltage, concrete material is other, after mixing and stirring the influence that the difference of quantity causes, form and be recorded as the current value of ideal degree of collapsing reference curve and standard, become a cover and can learn the measuring system that whether meets desirable degree of collapsing value immediately, whether fresh concrete just can be learnt when manufacturing is ideal degree of collapsing value, do not causing damage and can not resemble in the past afterwards.
The object of the present invention is achieved like this:
Instant slump measuring system when a kind of fresh concrete is produced, by the electric current of sensor cement mixer motor and the variation of voltage, on computer screen, show the curve map that changes by the computing of technical grade PC again, and contrast with the ideal curve figure that has set up in advance, just can learn immediately that this fresh concrete mixes and stirs degree of the collapsing value in the process.
This measuring system is to utilize current transformer (C.T), voltage transformer (VT) (P.T) and electric current, voltage transmitter (Voltage/Current Transducer), with the current conversion of mixer load is the DC4-20mA signal, insert the analog-to-digital converting module (A/D Module) of the programmable controller (PLC) of automatic production control system, numerical value after the conversion is sent to technical grade PC (IPC) by communication module (Communication Module) again, then PC just can obtain the current value and the magnitude of voltage of mixer load at any time: utilize one of them screen to show that as the screen window of instant slump measuring system mixing time and mixer load current value formation " ideal degree of collapsing reference curve " contrast when supplying to mix and stir each time, monitoring instant slump value, show that continuously present degree of collapsing value supplies operating personnel to promote and takes corresponding measure to revise degree of collapsing, to avoid influencing production efficiency and quality.
The variation of the bearing power of the desirable mixer of this measuring system is as the foundation of measuring system simultaneously.
In fact, with degree of the collapsing value of fresh concrete in mixer relation the closest be the load current value (or performance number) of mixer, so the present invention judges degree of collapsing value by analyzing the variation of mixer load current value.But learn in the explanation by the front, except concrete degree of collapsing, also have other multinomial factors also can influence the variation of mixer load current value, the present invention just is and will gets rid of other factor one by one, makes that the variation of mixer load current value is as follows with the factor of the variation of degree of collapsing value:
The quantity of 1, mixing and stirring: mix and stir capacity and set according to the maximum of mixer, every batch the amount of mixing and stirring can not be mixed and stirred capacity greater than the maximum of mixer; It is 0.5M normally
3Multiple (1M
3The total and about 2300-2400kgs of its raw material of concrete)
2, the concrete material that mixes and stirs is other: various material is (proportioning code name) representative various material formula of using, i.e. ratio of sand, stone, cement, flying dust, hearthstone powder water and other adjuvants not.
The water yield of 3, mixing and stirring: the water cut and the actual water yield that adds that comprise various aggregates.Fixedly the time, the water yield of mixing and stirring is exactly the principal element that influences concrete degree of collapsing at other material usage.
4, the resistance of mechanical conductive change: the element loss of mechanical conductive or the wearing and tearing of stirring blade and bottom lining plate, cause friction to change, it is gradual usually.In test of the present invention, do not list this factor in consideration; Because consumables easy to wear such as the stirring blade of mixer and bottom lining plates, the maintenance personal just should make regular check on, adjust originally, upgraded in case of necessity.If because of the factor of machinery, the accuracy that causes influence " instant slump measurement " that degree of collapsing is judged, therefore this can present the problem that machinery itself lacks maintenance, maintenance on the contrary.
5, the change of supply voltage: if the not change of the mechanical load of three-phase induction motor, then its load current (Current) is directly proportional with supply voltage (Voltage).
Starting current when 6, motor has just started: this is can be uncared-for in the present invention, because normal production operation program is to start the mixer motor before various raw materials drop into mixer earlier, back just can feed intake (blowing) that starting is finished gone into mixer and gone to stir: and in producing continuously, the mixer motor is non-stop.
Therefore, for realizing that the present invention must overcome following influence:
1, the influence that overcomes variation in voltage and caused:
Because the motor load electric current is directly proportional with supply voltage, so the present invention will detect supply voltage value, according to the change of magnitude of voltage, at any time the correcting current value supposes that original voltage is V1, and former incoming current is A1, afterwards because of voltage becomes V2, and the influenced A2 that becomes of electric current, then: V2/V1=A2/A1.
Because the commercial power of Taiwan low pressure often is AC 220V or 380V, so the present invention just is made as V1 general load voltage value, i.e. AC 220V.If present magnitude of voltage V2, present current value are A2, then learn the current value A1=A2 * V2/220 of mixer when rated voltage (being AC 220V) by above formula.
So as long as can get up till now magnitude of voltage and current value, just formula is adjusted into current value when the AC 220V with current value according to this.Therefore overcome variation in voltage to influence that electric current caused.
2, overcome other influence of concrete material of mixing and stirring:
Because different material is other, representing different material mix proportions; Or be called " proportioning code name ", or be " item number ".If different item numbers all independently gives data bank and writes down its " ideal degree of collapsing reference curve ", reach degree of a collapsing operation coefficient independently is set, just do not have the not different influence of material feeding, be not required to be yet and will be how the pattern of mixing and stirring respectively divided into different " groups of mixing " and bothered.
3, overcome the influence that difference caused of mixing and stirring quantity:
Even mix and stir identical item number, different quantity is mixed and stirred by regular meeting in the time of also.Mixing and stirring the difference of quantity, is sizable to the influence of mixer load current.Because general concrete premixing factory, the inferior quantity of mixing and stirring of every dish all is 0.5M when producing concrete
3Integral multiple is with the maximum amount of mixing and stirring 4.5M
3Mixer is example, i.e. 0.5M
3, 1.0M
3, 1.5M
3, 2.0M
3, 2.5M
3, 3.0M
3, 3.5M
3, 4.0M
3, 4.5M
3Deng; So the present invention not only gives independently data bank of different item numbers, each data bank is divided into several information data areas again simultaneously, and corresponding one of each information data area mixes and stirs quantity, is used for writing down its " ideal degree of collapsing reference curve " and standard current value.
The present invention mainly can influence the load current of mixer based on its degree of collapsing variation of the concrete in mixing and stirring, utilize the whole bag of tricks to go to get rid of the factor that other can influence the mixer load current, concrete degree of collapsing value in making mixer load current change and mixing and stirring changes into one and directly concerns, so as to produce a cover " instant slump measuring system " and compared in the past, have following advantage, as:
1, the present invention just can demonstrate " ideal degree of collapsing reference curve " that this mixes and stirs pattern, and just can show present degree of collapsing value continuously after uniform mixing in that every dish is less important when beginning to mix and stir; And the accuracy of its measurement has practical value very much.
2, the present invention has got rid of the influence of power supply voltage variation to the mixer load current earlier, segment again each mix and stir material not and each mix and stir quantity and one " ideal degree of collapsing reference curve " independently be set, and degree of a collapsing operation coefficient is set independently.
3, the accuracy of degree of collapsing measurement has improved.
4,, can find out that degree of collapsing is higher or on the low side on the curve by screen, and must not wait until complete uniform mixing at the mid-term stage that mixes and stirs; Operating personnel can take counter-measure ahead of time, revise degree of collapsing, and do not influence production efficiency.
5, running program has been simplified, and has not been required to be the pattern of mixing and stirring respectively to be divided into different " groups of mixing " and to bother.
6, the present invention can accomplish to measure automatically also in mixer but concrete degree of the collapsing value of uniform mixing, judge according to this for operating personnel whether the concrete degree of collapsing of this production batch qualified? need take correction measure?
7, when mix is finished the computer of control system also according to this measured degree of the collapsing value of slump measuring system judge whether the concrete degree of collapsing of this production batch qualified? if the defective discharge action that then produces caution and automatic system mixer removes to take correction measure by operating personnel again.
8, production control system, degree of the collapsing value that " instant slump instrument " every dish can be measured is listed in the record of production of computer, traces with convenient QC afterwards.
If the concrete degree of collapsing 9, in mixer is too little, as long as add suitable water again, continue uniform mixing, just can revise its degree of collapsing.
Description of drawings
Fig. 1 is an integrated stand composition of the present invention;
Fig. 2 is one of screen of production control system of the present invention;
Fig. 3 be production control system of the present invention screen two;
Fig. 4 is that instant slump of the present invention is measured screen window;
Fig. 5 is a mixer load curve of the present invention;
One of data bank that Fig. 6 uses for the present invention;
Two of the data bank that Fig. 7 uses for the present invention;
Fig. 8 is ideal degree of a collapsing reference curve of the present invention;
Fig. 9 is the curve performance figure of standard degree of collapsing of the present invention;
Figure 10 is the curve performance figure of degree of collapsing of the present invention when higher;
Figure 11 is the curve performance figure of degree of collapsing of the present invention when on the low side;
Figure 12 is a proportioning shelves picture of the present invention;
Figure 13 is one of Slump Test table of the present invention;
Figure 14 is two of a Slump Test table of the present invention;
Figure 15 is three of a Slump Test table of the present invention;
Figure 16 is existing degree of collapsing awl three-dimensional structure diagram;
Figure 17 is existing degree of collapsing awl operation chart;
Figure 18 is existing degree of collapsing instrumentation plan.Reference number number among the figure:
1 current transformer, 2 voltage transformer (VT)
3 current transducers, 31 voltage transmitters
4 mixers, 5 programmable controllers
51A/D converter 52 communication module brief description of drawingsfig
6 PC, 61 screens
62 screens, 7 degree of collapsing awl
71 carrying handles, 72 round mouths
73 concrete are bored 74 mark posts
75 gages
Embodiment
The present invention will be described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, be system architecture diagram of the present invention, utilize current transformer (C.T) (1), voltage transformer (VT) (P.T) 2 and voltage, current sensor 3,31 (Voltage/Current Transducer), with the current conversion of mixer 4 loads is DC 420mA signal, insert the analog-to-digital converting module 51 (A/D Module) of the programmable controller 5 (PLC) of automatic production control system, numerical value after the conversion is sent to technical grade PC 6 (IPC) by communication module 52 (Communication Module) again, and then PC 6 just can obtain the current value and the magnitude of voltage of mixer 4 loads at any time
The computer 6 of production control system has two screens 61,62 (shown in Fig. 2,3), and screen 61 wherein is as the screen window (as shown in Figure 4) of instant slump measuring system, and horizontal base parameter (X-axis) is mixing time (by 0 to 100 second); Vertical base parameter (Y-axis) is the mixer load current value, and in order to obtain best degree of collapsing reference pattern resolution, its upper limit makes scale value and lower limit is made scale value for adjusting, and capping is 400A as scale value, and lower limit is 150A as scale value.The process of at every turn mixing and stirring, at any time the mixer load current value is signed on degree of the collapsing monitoring image with darker curve, if this mixes and stirs pattern and does not also write down " ideal degree of collapsing reference curve ", then as shown in Figure 5, have only load curve in the hard disk drive of computer, to arrange a sub-directory, deposit the data bank of " ideal degree of collapsing reference curve " specially, each different item number just corresponding one independently data bank (as Fig. 6, shown in 7), each data bank is divided into nine row, corresponding respectively nine kinds of different amounts of mixing and stirring are (by 0.5,1.0,1.5-4.5 cubic meter), every row is divided into 101 fields again, 100 fields of front are used for depositing the current value of " ideal degree of collapsing reference curve ", and the 101st field is used for depositing " standard current value ".
If this mixes and stirs pattern and does not also write down " ideal degree of collapsing reference curve ", and the QC personnel find that by test findings this concrete degree of collapsing that mixes and stirs is a standard very, then click " record " key, computer just will be drawn in the load curve current value on degree of the collapsing monitoring image just now, average p.s. once, again that this is average current value was stored by 1 to 100 second mixing time in regular turn and enters corresponding field 1 to 100, the load current value that will " mix and stir setting-up time " in addition by the first five second on average obtains " standard current value ", again this " standard current value " is deposited field 101.
If this pattern of mixing and stirring has had record " ideal degree of collapsing reference curve ", then before beginning to mix and stir, computer is just gone to read by data bank, and demonstrates " ideal degree of collapsing reference curve " (as shown in Figure 8) on degree of collapsing monitoring image, and wherein the width of reference curve can be set.
When " mixing and stirring setting-up time " began by preceding 20 seconds, till beginning discharge to mixer continuously always, computer will degree of collapsing monitoring image the upper right corner show degree of the collapsing value of measuring (shown in Fig. 9,10,11), wherein as shown in Figure 9, the load curve that mixes and stirs is consistent with ideal degree of collapsing reference curve, represents very standard of this degree of collapsing that mixes and stirs.As shown in figure 10, load curve is on the low side in ideal degree of collapsing reference curve, represents that this degree of collapsing is higher.Load curve is higher than ideal degree of collapsing reference curve as shown in figure 11, represents that this degree of collapsing is on the low side.And the computing formula of this degree of collapsing value is:
Measurement degree of collapsing value=standard degree of collapsing value-degree of collapsing coefficient * (estimated current value-standard current value) * 100
Estimated current value: the present actual loading current value of mixer (correction of superpotential change is presented at the upper left corner of degree of collapsing monitoring image)
Standard current value: be stored in corresponding to this and mix and stir in the pattern data bank numerical value of the 101st field
Standard degree of collapsing value: originally mix and stir in the item number (proportioning code name) standard degree of the collapsing value of design (proportioning shelves picture as shown in figure 12)
Degree of collapsing coefficient: follow degree of the collapsing coefficient value (proportioning shelves picture as shown in figure 12) in each item number (proportioning code name)
When the QC personnel find that prediction degree of the collapsing value that shows is incorrect on degree of collapsing monitoring image, then can click " degree of collapsing " key, import actual correct degree of collapsing value, computer then removes to calculate correct " degree of collapsing coefficient value " automatically, and deposit in this proportioning data bank, if when mixing and stirring identical item number more later, the prediction of degree of collapsing will be correct.The computing formula of degree of collapsing coefficient value is:
Degree of collapsing coefficient=[(standard degree of collapsing value-actual degree of collapsing value) * (this dish primary current value standard-current value)] * 100.
" instant slump measuring system " of the present invention, meeting demonstrate the tolerance of collapsing of measurement after the material in mixer stirred on the picture form.Write down this degree of collapsing value, and then by mixing and stirring the fresh concrete sampling of finishing, do the finished product Slump Test of four parts of reality, obtain four trial values according to the concrete Slump Test method (Method of slump test for concrete) of CNS1176 when dish.For lowering the error of artificial measurement, these four trial values are in addition average, reject a trial value with the mean value disparity then, three remaining trial values are average again, come again to compare, list its error amount with " instant slump measuring system " measured degree of collapsing value.Mix and stir the test more than the repetition in the dish time different, its result is made into the test form.
The result who gets according to above method is shown in Figure 13,14,15 table, and its result is as follows by analysis:
1. its design degree of collapsing scope of Shi Yan sample is by 5cm to 20cm, and this has comprised degree of the collapsing scope of the general commerical ready-mixed concrete of using always
2. the error range of " instant slump measuring system " measured degree of collapsing value and actual degree of collapsing is all in ± 0.5cm.
3. this accuracy of representing its measurement has practical value very much.Even because by artificial concrete Slump Test method test findings according to CNS1176, error range ± more than the 0.5cm, also be common thing, so the present invention gets the test of many times value when artificial test average, accurate to make every effort to it.
Claims (3)
1. the instant slump measuring system a when fresh concrete is produced, it is characterized in that: by the electric current of sensor cement mixer motor and the variation of voltage, on computer screen, show the curve map that changes by the computing of technical grade PC again, and contrast with the ideal curve figure that has set up in advance, just can learn immediately that this fresh concrete mixes and stirs degree of the collapsing value in the process.
2. the instant slump measuring system when producing according to the described fresh concrete of claim 1, it is characterized in that: this measuring system is to utilize current transformer (C.T), voltage transformer (VT) (P.T) and electric current, voltage transmitter, with the current conversion of mixer load is the DC4-20mA signal, insert the analog-to-digital converting module (A/D Module) of the programmable controller (PLC) of automatic production control system, numerical value after the conversion is sent to technical grade PC (IPC) by communication module again, then PC just can obtain the current value and the magnitude of voltage of mixer load at any time: utilize the screen window of one of them screen as instant slump measuring system, show mixing time and mixer load current value, form ideal degree of collapsing reference curve, contrast when supplying to mix and stir each time, monitoring instant slump value, show that continuously present degree of collapsing value supplies operating personnel to promote and takes corresponding measure to revise degree of collapsing, to avoid influencing production efficiency and quality.
3. the instant slump measuring system when producing according to the described fresh concrete of claim 1, it is characterized in that: the variation of desirable mixer bearing power is as the foundation of measuring system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100704 CN1432809A (en) | 2002-01-18 | 2002-01-18 | Instant slump measuring system for freshly produced concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100704 CN1432809A (en) | 2002-01-18 | 2002-01-18 | Instant slump measuring system for freshly produced concrete |
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|---|---|
| CN1432809A true CN1432809A (en) | 2003-07-30 |
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| CN 02100704 Pending CN1432809A (en) | 2002-01-18 | 2002-01-18 | Instant slump measuring system for freshly produced concrete |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615709A (en) * | 2012-03-30 | 2012-08-01 | 三一重工股份有限公司 | Concrete slump monitoring device and method |
| CN103983760A (en) * | 2014-05-30 | 2014-08-13 | 福建南方路面机械有限公司 | Concrete mixing performance prediction method based on least squares support vector machine |
| CN104062205A (en) * | 2014-07-10 | 2014-09-24 | 国家电网公司 | Photoelectric concrete slump tester |
| CN104569360A (en) * | 2014-12-26 | 2015-04-29 | 湖南万物工业软件有限公司 | Concrete slump controlling method and system of mixing station |
| CN107643322A (en) * | 2017-09-15 | 2018-01-30 | 重庆交通大学 | Quality determining method and device |
| CN108107931A (en) * | 2017-12-14 | 2018-06-01 | 长安大学 | A kind of mixture mixes and stirs method of quality control and system |
| CN110202697A (en) * | 2019-06-27 | 2019-09-06 | 三一汽车制造有限公司 | Concrete central mix plant and its control method |
| CN111257170A (en) * | 2020-03-12 | 2020-06-09 | 王立伍 | Indirect observation method for solving slump change in concrete production process |
| CN113758572A (en) * | 2021-08-19 | 2021-12-07 | 葛洲坝集团试验检测有限公司 | Real-time monitoring system and method for temperature of outlet of concrete mixture |
-
2002
- 2002-01-18 CN CN 02100704 patent/CN1432809A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615709B (en) * | 2012-03-30 | 2014-09-10 | 三一重工股份有限公司 | Concrete slump monitoring device and method |
| CN102615709A (en) * | 2012-03-30 | 2012-08-01 | 三一重工股份有限公司 | Concrete slump monitoring device and method |
| CN103983760B (en) * | 2014-05-30 | 2016-04-13 | 福建南方路面机械有限公司 | Based on the concrete-agitating performance prediction method of least square method supporting vector machine |
| CN103983760A (en) * | 2014-05-30 | 2014-08-13 | 福建南方路面机械有限公司 | Concrete mixing performance prediction method based on least squares support vector machine |
| CN104062205B (en) * | 2014-07-10 | 2016-06-01 | 国家电网公司 | Photoelectric type concrete slump tester |
| CN104062205A (en) * | 2014-07-10 | 2014-09-24 | 国家电网公司 | Photoelectric concrete slump tester |
| CN104569360A (en) * | 2014-12-26 | 2015-04-29 | 湖南万物工业软件有限公司 | Concrete slump controlling method and system of mixing station |
| CN107643322A (en) * | 2017-09-15 | 2018-01-30 | 重庆交通大学 | Quality determining method and device |
| CN108107931A (en) * | 2017-12-14 | 2018-06-01 | 长安大学 | A kind of mixture mixes and stirs method of quality control and system |
| CN108107931B (en) * | 2017-12-14 | 2021-05-28 | 长安大学 | Method and system for controlling mixing quality of mixture |
| CN110202697A (en) * | 2019-06-27 | 2019-09-06 | 三一汽车制造有限公司 | Concrete central mix plant and its control method |
| CN111257170A (en) * | 2020-03-12 | 2020-06-09 | 王立伍 | Indirect observation method for solving slump change in concrete production process |
| CN113758572A (en) * | 2021-08-19 | 2021-12-07 | 葛洲坝集团试验检测有限公司 | Real-time monitoring system and method for temperature of outlet of concrete mixture |
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