CN101968373B - Negative pressure monitoring system and negative pressure monitoring method for powder measurement - Google Patents

Negative pressure monitoring system and negative pressure monitoring method for powder measurement Download PDF

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Publication number
CN101968373B
CN101968373B CN2010102818609A CN201010281860A CN101968373B CN 101968373 B CN101968373 B CN 101968373B CN 2010102818609 A CN2010102818609 A CN 2010102818609A CN 201010281860 A CN201010281860 A CN 201010281860A CN 101968373 B CN101968373 B CN 101968373B
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negative pressure
powder
metering
pressure
weighing hopper
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CN101968373A (en
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彭佳华
刘璟
徐宏胜
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Sany Heavy Industry Co Ltd
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Sany Heavy Industry Co Ltd
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Abstract

The invention discloses a negative pressure monitoring system and a negative pressure monitoring method for powder measurement, used for measuring powder with a powder measuring device in a concrete stirring station. The negative pressure monitoring method comprises the following steps of: giving a negative pressure tolerance value of a powder measuring hopper; acquiring the intensity of pressure in the powder measuring hopper and the intensity of pressure in a stirring main machine and calculating the negative pressure of the powder measuring hopper according to the acquired intensities of pressure in the powder measuring hopper and the stirring main machine; and judging whether the negative pressure is in the negative pressure tolerance value range or not, permitting to measure when the negative pressure is in the negative pressure tolerance value range or else adopting a corresponding measuring solution. According to the method of the invention, online monitoring is carried out on abnormal conditions of the negative pressure during powder measurement, and the tolerance value of the negative pressure is limited so that powder is smartly measured in selected time on the basis to avoid a negative pressure peak, and the influence of the negative pressure on the powder measurement is lessened. In addition, the invention also provides the data in the full process for plants and users to refer.

Description

The negative pressure supervisory system and the negative pressure method for supervising of powder metering
Technical field
The present invention relates to the negative pressure supervisory system that a kind of powder that is used for the powder WT-MSR of concrete mixing plant measures, the invention still further relates to a kind of negative pressure method for supervising that is used for the powder metering of concrete mixing plant.
Background technology
At present; Concrete mixing plant powder WT-MSR generally includes the powder weighing hopper that is supported by weighing device; Powder weighing hopper lower end is provided with a Pneumatic butterfly valve; Powder connects the entering stirring host through the switch of Pneumatic butterfly valve through cloth bag, and powder weighing hopper upper end then links to each other with the worm conveyor blanking port through rubber hose.When powder weighing hopper during in powder metering and powder discharging, can produce negative pressure, influence the accuracy that powder measures, all there is potential influence in the accuracy and the quality of concrete of enterprise's powder consumption.
When mixing plant adopts bag-type dust or box dust pelletizing system; Can with powder weighing hopper upper end directly and cloth bag or the case that gathers dust couple together; Realize the release and the supplementary functions of pressure through the space of the cloth bag or the case that gathers dust; But because the volume of cloth bag or dust cleaning case is limited, the short time inner air pressure can't discharge rapidly and replenish, and still there is bigger measurement deviation in the powder metering.
In addition; Can adopt connecting pipe that the powder weighing bucket is communicated with stirring host; Reach the effect of balance stirring host and powder weighing bucket internal pressure, but because interior stirring host of short time and powder weighing bucket inner air pressure are difficult to balance, the stressed cross-sectional area in upper end and lower end is different; And connecting pipe blocks easily, therefore still can have bigger measurement deviation.
At present, concrete mixing plant manufacturer and concrete production enterprise are all less than enough paying attention to the influence problem of negative pressure to the powder metering.
Summary of the invention
The object of the present invention is to provide a kind of negative pressure supervisory system of powder metering, be used for the powder WT-MSR of concrete mixing plant, to reduce the influence of negative pressure the metering result.The present invention also aims to provide a kind of negative pressure method for supervising of powder metering.
For this reason, the invention provides the negative pressure supervisory system of a kind of powder metering, be used for concrete mixing plant powder WT-MSR, it comprises: first detecting unit that is used to gather the atmospheric pressure in the powder weighing hopper of powder WT-MSR; Be used to gather second detecting unit of the atmospheric pressure in the stirring host of powder WT-MSR; And control module; The detection signal that is used for providing according to first detecting unit and second detecting unit calculates the suffered negative pressure of powder weighing hopper; Judge that negative pressure is whether in given negative pressure License Value scope; And allow the powder weighing hopper to carry out metrological operation in the time of in negative pressure is in negative pressure License Value scope, otherwise take to measure counter-measure.
Further, the negative pressure supervisory system of above-mentioned powder metering also comprises the alarm unit of when negative pressure surpasses negative pressure License Value scope, reporting to the police that is electrically connected with control module.
Further, above-mentioned control module also is used for the suffered negative pressure of real time record powder weighing hopper.
Further, above-mentioned first detecting unit is a pressure transducer, and second detecting unit is a pressure transducer, and control module is an industrial computer.
Further, the metering counter-measure taked of above-mentioned control module comprises that the time-delay metering is to avoid negative pressure peak or dosage compensation to correct measurement deviation.
On the other hand, the present invention also provides a kind of negative pressure method for supervising of powder metering, is used for the powder metering of the powder WT-MSR of concrete mixing plant, and it may further comprise the steps: the negative pressure License Value of the powder weighing hopper of given powder WT-MSR; Atmospheric pressure in the powder weighing hopper and the atmospheric pressure in the stirring host are gathered, calculated the suffered negative pressure of powder weighing hopper according to pressure in the powder weighing hopper of gathering and the pressure in the stirring host; And judge that negative pressure in the powder weighing hopper whether in given negative pressure License Value scope, allows in the time of in negative pressure is in negative pressure License Value scope to continue metering, otherwise takes to measure counter-measure.
Further, above-mentioned metering counter-measure comprises that metering is to avoid the negative pressure peak when selecting.
Further, above-mentioned metering counter-measure comprises that dosage compensation is to correct measurement deviation.
Further, above-mentioned metering counter-measure comprises the negative pressure warning.
Further, the negative pressure method for supervising of above-mentioned powder metering also comprises the step that the pressure and/or the negative pressure in the powder weighing hopper of collection are carried out real time record.
According to the present invention; The negative pressure permissible value of powder weighing hopper has been made restriction and the negative pressure abnormal conditions in the powder metering have been made on-line monitoring; But smart timing is simultaneously carried out the powder metering to avoid the negative pressure peak; So reduced the influence of negative pressure, also can provide the overall process data to supply producer and user's reference in addition the powder metering.
Except top described purpose, characteristic and advantage, other purpose, characteristic and advantage that the present invention has are with combining accompanying drawing to do further detailed explanation.
Description of drawings
Constitute this instructions a part, be used for further understanding accompanying drawing of the present invention and show the preferred embodiments of the present invention, and be used for explaining principle of the present invention with instructions.Among the figure:
Fig. 1 shows the structural representation according to powder WT-MSR of the present invention;
Fig. 2 shows the structured flowchart according to the negative pressure supervisory system of powder metering of the present invention; And
Fig. 3 shows the process flow diagram of the negative pressure method for supervising of powder metering according to the preferred embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
In the present invention, the size of the negative pressure of powder WT-MSR has been carried out real-time monitoring, the negative pressure License Value has been carried out clear and definite defining, and the concrete data of negative pressure to powder metering influence are provided.
Technical term of the present invention " negative pressure " is construed as pressure, the numerical value of this pressure might be on the occasion of, also might be negative value, the unit of this pressure is a kilogram, i.e. kgf, this kgf is the basic unit of power in the engineering system of units, 1kgf ≈ 9.8N.
Fig. 1 shows the structural representation according to powder WT-MSR of the present invention.As shown in Figure 1; Powder weighing hopper 1 and stirring host 2 are connected through the rubber hose 6 grades body that is flexible coupling; The screw machine (not shown) at powder weighing hopper 1 and the upper reaches is connected through the cloth bag 5 grades body that is flexible coupling; On the top of powder weighing hopper 1 first detecting unit 3 that is used to gather pressure P1 in the powder weighing hopper 1 is installed, second detecting unit 4 that is used to gather pressure P2 in the stirring host 2 is installed covering of stirring host 2.
Fig. 2 shows the structured flowchart according to the negative pressure supervisory system of the powder metering that is used for the powder WT-MSR according to the present invention.As shown in Figure 2, first detecting unit 3 and second detecting unit 4 are preferably pressure transducer, and control module is preferably industrial computer, is used to control alarm unit and powder WT-MSR.First detecting unit and second detecting unit offer control module with the signal of gathering; Control module online calculates the size of the suffered negative pressure F of powder weighing hopper; Whether in negative pressure License Value scope, judge negative pressure condition according to it; Allow said powder weighing hopper to carry out metrological operation in the time of in negative pressure is in negative pressure License Value scope, otherwise take to measure counter-measure.
In a preferred embodiment, above-mentioned metering counter-measure is that negative pressure is reported to the police and metering (time-delay metering) when selecting, thereby reduces the influence of negative pressure to the powder metering.
In another preferred embodiment, the metering countermeasure is that negative pressure is reported to the police and the metering of permission powder, carries out dosage compensation simultaneously to correct measurement deviation.
In other embodiments, the metering counter-measure can only select that negative pressure is reported to the police, a kind of when selecting in metering and the dosage compensation.
Fig. 3 shows the process flow diagram of the negative pressure method for supervising of powder metering according to the preferred embodiment of the invention.Combine Fig. 3 that the negative pressure method for supervising of this preferred embodiment is described, this negative pressure method for supervising may further comprise the steps at present:
Step S11: the negative pressure License Value a of the powder weighing hopper of given powder WT-MSR.Find that according to repeatedly field observation experience and test testing result powder metering negative pressure value is generally all about 6~15Kgf, and is even bigger, so negative pressure License Value a suggested range is 0~10Kgf, this value can be revised as the case may be;
Step S13: first detecting unit 3 and second detecting unit 4 are installed on powder weighing hopper upper end, stirring host upper end respectively; Gather the pressure signal in powder weighing hopper and the stirring host in real time; Convert electric signal into and be sent to the PLC analog module; Real-time pressure data through pressure P2 in pressure P1, the stirring host in the conversion acquisition powder weighing hopper is stored in the control module;
Step S15: control module online calculates the suffered vacuum magnitude F of powder weighing hopper according to the detection signal that first detecting unit and second detecting unit provide, the absolute value of judging F promptly | whether F|<a sets up;
Negative pressure F is the function of pressure P1 and P2, promptly F=f (P1, P2).In concrete mixing plant metering occasion, the suffered negative pressure of powder weighing hopper can by under attach formula and generally express: F=(P1*S1)/9.8-(P2*S2)/9.8 ... (1).
In above-mentioned formula (1), the unit of negative pressure F is kgf, and P1 is the pressure in the powder weighing hopper; P2 is the pressure in the stirring host; The value of S1 and S2 is definite by the structural design of powder WT-MSR, for example, and in powder WT-MSR shown in Figure 1; S1 is the flow area of the body that is flexible coupling between the screw machine at the weighing hopper and the upper reaches, and S2 is the flow area of the body that is flexible coupling between stirring host and the weighing hopper.
Next, according to comparative result the powder metering of powder WT-MSR is controlled:
If | F|<a sets up, and then execution in step S17 allows the powder metering, and finishing, get into next circulation up to this powder metering is step S19;
If | F|<a is false, and then execution in step S16 provides the negative pressure alarm by host computer monitoring software, and real time record;
Next execution in step S18; Powder metering this moment suspends to be waited for, Intelligence Selection high negative pressure period of staggering measures, and takes multiple measure to make the system pressure balance fast simultaneously; Time-delay 3S returns back to step S13, and so circulation is satisfied until pressure equilibrium | F|<a next circulation metering of being allowed for access.
The system pressure balanced measure can take mode to comprise negative pressure valve at present, and the negative pressure Free up Memory of powder weighing hopper is communicated with stirring host and powder weighing hopper, increases system pressure equilibration time etc.
In other embodiment, when the absolute value of negative pressure falls into the negative pressure License Value promptly according to the inventive method | during F|<a, allow to continue metrological operation, carry out dosage compensation to correct measurement deviation according to the size of negative pressure simultaneously.
In other embodiment according to the inventive method, the negative pressure License Value can be an interval for example-a is to+a, when negative pressure F falls into this interval, thinks that then negative pressure falls in the negative pressure License Value scope.
Can find out through foregoing description; The present invention has made restriction to the negative pressure permissible value, and the negative pressure abnormal conditions are made on-line fault diagnosis and alarm, and powder metering negative pressure is carried out real time record; Provide the overall process data to supply producer and user's reference; And smart timing carries out powder metering, effectively avoids the negative pressure peak, greatly reduced the influence of negative pressure to the powder metering.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. the negative pressure supervisory system of a powder metering is used for concrete mixing plant powder WT-MSR, it is characterized in that, comprising:
Be used to gather first detecting unit of the atmospheric pressure in the powder weighing hopper of said powder WT-MSR;
Be used to gather second detecting unit of the atmospheric pressure in the stirring host of said powder WT-MSR; And
Control module; Be used for calculating the suffered negative pressure of said powder weighing hopper according to the detection signal that said first detecting unit and second detecting unit provide; Judge that said negative pressure is whether in given negative pressure License Value scope; And allow said powder weighing hopper to carry out metrological operation in the time of in said negative pressure is in negative pressure License Value scope, otherwise take to measure counter-measure.
2. negative pressure supervisory system according to claim 1 is characterized in that, also comprises the alarm unit of when said negative pressure surpasses said negative pressure License Value scope, reporting to the police that is electrically connected with said control module.
3. negative pressure supervisory system according to claim 1 is characterized in that, said control module comprises and is used for the pressure that real time record gathers and/or the logging modle of the suffered negative pressure of said powder weighing hopper.
4. negative pressure supervisory system according to claim 1 is characterized in that, said first detecting unit is a pressure transducer, and said second detecting unit is a pressure transducer, and said control module is an industrial computer.
5. negative pressure supervisory system according to claim 1 is characterized in that, the metering counter-measure that said control module is taked comprises that the time-delay metering is to avoid negative pressure peak or dosage compensation to correct measurement deviation.
6. the negative pressure method for supervising of a powder metering is used for the powder metering of the powder WT-MSR of concrete mixing plant, it is characterized in that, may further comprise the steps:
The negative pressure License Value of the powder weighing hopper of given said powder WT-MSR;
Pressure in the powder weighing hopper and the atmospheric pressure in the stirring host are gathered, calculated the suffered negative pressure of said powder weighing hopper according to pressure and the atmospheric pressure in the stirring host in the powder weighing hopper of gathering; And
Judge that negative pressure in the said powder weighing hopper whether in given negative pressure License Value scope, allows in the time of in said negative pressure is in negative pressure License Value scope to continue metering, otherwise takes to measure counter-measure.
7. the negative pressure method for supervising of powder metering according to claim 6 is characterized in that, said metering counter-measure comprises that metering is to avoid the negative pressure peak when selecting.
8. the negative pressure method for supervising of powder metering according to claim 6 is characterized in that, said metering counter-measure comprises that dosage compensation is to correct measurement deviation.
9. the negative pressure method for supervising of powder metering according to claim 6 is characterized in that, said metering counter-measure comprises that carrying out negative pressure reports to the police.
10. the negative pressure method for supervising of powder metering according to claim 6 is characterized in that, also comprises the step that the pressure and/or the negative pressure in the said powder weighing hopper of collection are carried out real time record.
CN2010102818609A 2010-09-15 2010-09-15 Negative pressure monitoring system and negative pressure monitoring method for powder measurement Active CN101968373B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102494527B (en) * 2011-11-16 2013-12-11 中联重科股份有限公司 Negative pressure control process, negative pressure controller, negative pressure control system for drying drum and mixing equipment
CN103009483B (en) * 2012-12-17 2015-06-17 中联重科股份有限公司 Powder metering control system, method and device
CN109496266B (en) * 2016-07-27 2021-03-09 布勒股份公司 Dosing and weighing device and method for determining the weight of a product in a dosing and weighing device
CN116145500A (en) * 2023-03-31 2023-05-23 徐州徐工养护机械有限公司 Compensation system for rapidly balancing negative pressure

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002013973A (en) * 2000-06-29 2002-01-18 Mitsubishi Heavy Ind Ltd Powder weighting device
JP2002323365A (en) * 2001-04-27 2002-11-08 Bridgestone Corp Weighing device for powder and control method
CN2581955Y (en) * 2002-12-10 2003-10-22 方圆集团有限公司 Weighing meter for continuously reducing powder material
WO2005090163A1 (en) * 2004-03-23 2005-09-29 Technopak Limited Filling apparatus having bulk and make-up delivery
CN1719359A (en) * 2005-04-30 2006-01-11 江苏南大紫金科技集团有限公司 Intelligent pneumatic transfer metering dosage device
CN2915450Y (en) * 2006-06-19 2007-06-27 镇江华晨华通路面机械有限公司 Positive and negative pressure control concrete-stirring main machine
CN101464184B (en) * 2007-12-19 2011-01-26 软控股份有限公司 Negative-pressure pneumatic conveying and measuring system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002013973A (en) * 2000-06-29 2002-01-18 Mitsubishi Heavy Ind Ltd Powder weighting device
JP2002323365A (en) * 2001-04-27 2002-11-08 Bridgestone Corp Weighing device for powder and control method
CN2581955Y (en) * 2002-12-10 2003-10-22 方圆集团有限公司 Weighing meter for continuously reducing powder material
WO2005090163A1 (en) * 2004-03-23 2005-09-29 Technopak Limited Filling apparatus having bulk and make-up delivery
CN1719359A (en) * 2005-04-30 2006-01-11 江苏南大紫金科技集团有限公司 Intelligent pneumatic transfer metering dosage device
CN2915450Y (en) * 2006-06-19 2007-06-27 镇江华晨华通路面机械有限公司 Positive and negative pressure control concrete-stirring main machine
CN101464184B (en) * 2007-12-19 2011-01-26 软控股份有限公司 Negative-pressure pneumatic conveying and measuring system

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