CN103331264A - Method for realizing cascade lifting periodical change of rotating speed of dynamic powder concentrator - Google Patents
Method for realizing cascade lifting periodical change of rotating speed of dynamic powder concentrator Download PDFInfo
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- CN103331264A CN103331264A CN2013102530402A CN201310253040A CN103331264A CN 103331264 A CN103331264 A CN 103331264A CN 2013102530402 A CN2013102530402 A CN 2013102530402A CN 201310253040 A CN201310253040 A CN 201310253040A CN 103331264 A CN103331264 A CN 103331264A
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- rotating speed
- powder concentrator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention discloses a method for realizing cascade lifting periodical change of the rotating speed of a dynamic powder concentrator. The method is characterized in that a PLC (Programmable Logic Controller) is arranged in a control circuit of a driving device of a traditional dynamic powder concentrator, a control command can be sent to a frequency converter through the PLC, the cascade lifting periodical change can be generated in a way that the output rotating speed of a variable frequency motor is controlled by the frequency converter, and thus the purpose of synchronously generating the cascade lifting periodical change of the rotating speed of rotors of the dynamic powder concentrator can be reached. According to the method disclosed by the invention, the rotating speed of the rotors of the dynamic powder concentrator can be freely set into a plurality of rotating speed stages, the rotating speed and the corresponding running time in each stage can be freely controlled, the cascade lifting periodical change of the rotating speed of the rotors can be automatically realized, and thus the technical difficulty that the a size distribution range of a cement product which is selected by winnowing by the traditional dynamic powder concentrator under a constant rotating speed state is narrower can be overcome.
Description
Technical field
The present invention relates to powder concentrator method for controlling number of revolution field, be specially a kind of method of the dynamic powder concentrator rotating speed of the realization step heave period variation for the dynamic rotor of powder separator of vertical flour mill.
Background technology
At present, known vertical flour mill (including but not limited to vertical roll grinder, Raymond mill, column mill and the vertical grinding machine or the equipment that similarly contain classification mechanism) all designs and selects powder classification mechanism (also being called dynamic powder concentrator or separator or grader), and its function is that selection by winnowing goes out the fine powder that product fineness meets the requirements.
The operation principle of vertical flour mill, as shown in Figure 1.Main motor 1 drives vertical type speed reducer (change gear) 2, drive mill 3 rotations, material on feeding elephant trunk 7 feeding mills 3 enters the grinding roller-way between grinding roller 4 and the mill 3 under action of centrifugal force, grinding roller 4 is under the effect of hydraulic jack 5, exert pressure to material, material behind the grinding is brought into dynamic powder concentrator 8 via the high speed ascending air of vane 6, controls the rotating speed of dynamic powder concentrator 8 rotors, and meal can not pass through rotor, fall mill 3 back again by grinding, so circulation.Have only the qualified fine powder of fineness 9 could pass through rotor, take grinding machine out of by wind-force, captured by follow-up equipment-all kinds of dust-precipitators again and get off to become finished product.
The operation principle of conventional dynamic powder concentrator drive unit, as shown in Figure 2.Frequency converter is exported the electric current of a certain frequency, and under the driving of the electric current of this frequency, variable-frequency motor through the deceleration of reductor, drives dynamic powder concentrator with certain constant rotating speed rotation with certain constant rotating speed rotation.
The common ground of conventional dynamic powder concentrator is that in the ordinary production stage, dynamically the rotating speed of rotor of powder separator is constant.No matter whether drive unit adopts variable-frequency motor, and by grinding material, dynamically the rotating speed of rotor of powder separator is the mode by manual intervention for specifically, is adjusted in some fixing values, such as 700rpm, and 900rpm, 1200rpm etc.Rotor speed changes during the production run of conventional dynamic powder concentrator, as shown in Figure 3.
Known conclusion is in the industry, the cement that traditional ball mill grinds, and its RRSB size distribution curve is wideer, as shown in Figure 4.Every performance indications of cement meet the use habit of national standard and concrete industry.The cement that vertical flour mill grinds, the characteristic feature that the particle size distribution that has is narrow, its RRSB size distribution curve is more sharp-pointed, as shown in Figure 5.This feature causes the grain composition of cement not have the reasonable of ball mill, the too late ball mill of the overall performance of cement.So the application of vertical flour mill aspect cement grinding is universal far away from the raw material grinding.But vertical flour mill have mill efficiency height, energy consume low, do not have grinding, floor space is little, construction investment is low, technological process is simple, transform kind fast, easily be automated the advantage that control etc. is given prominence to, be that ball mill is incomparable, so as the cement end milling equipment, be developing direction from now on vertical flour mill.Therefore, how fundamentally to solve the grain composition problem of the cement that vertical flour mill grinds, become the key problem in technology of applying the whole pulverizing cement of vertical flour mill.
In the rational cement granules grating of generally acknowledging, the granule content of＜1 μ m is 0 substantially, the granule content of 1-3 μ m should reach about 10%, the granule content of 3-32 μ m should reach about 70%, the granule content of＞65 μ m is 0 substantially, could take into account the normal performance of cement early strength and later strength and other physical property so all sidedly.
The cement that vertical flour mill grinds is compared with ball mill, though intensity was identical in 28 days, but because the grain composition scope is narrow, 1～3 μ m granule content only is 6%, 3-32 μ m granule content is up to 82%, cause the water requirement of cement big, setting time is long, early strength is low, concrete workability is bad, is difficult to be accepted by the concrete industry always.
Summary of the invention
The purpose of this invention is to provide a kind of method that realizes the variation of dynamic powder concentrator rotating speed step heave period, make the rotating speed of this dynamic rotor of powder separator can realize automatically that the synchronism of step lifting changes, to overcome the narrower problem of cement products particle size distribution that traditional dynamic powder concentrator is elected in permanent rotating speed state leeward.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of method that realizes the variation of dynamic powder concentrator rotating speed step heave period, it is characterized in that: in the control loop of traditional dynamic powder concentrator drive unit, be provided with the PLC Programmable Logic Controller, by the PLC Programmable Logic Controller frequency converter is sent control instruction, make the frequency of the electric current of frequency converter output be the variation of step heave period, according to motor speed formula n=60f/p, in the formula: the n motor speed, the f power frequency, p motor number of pole-pairs, produce step heave period ground synchronously with the variation of the frequency of the electric current of step heave period variation by the output speed of the variable-frequency motor of Frequency Converter Control and change, thereby the synchronization that reaches dynamic rotor of powder separator produces the purpose of step heave period variation.
Described a kind of method that realizes the variation of dynamic powder concentrator rotating speed step heave period, it is characterized in that: in the PLC Programmable Logic Controller, set the frequency of several electric currents and the time of keeping accordingly with this frequency, the rotating speed of the corresponding corresponding dynamically rotor of powder concentrator of each frequency and time and with this rotating speed corresponding running time, the PLC Programmable Logic Controller sends control instruction according to the frequency in several stages of setting and the running time of each stage correspondence to frequency converter.
The invention enables the rotating speed of dynamic rotor of powder separator can freely set several rotating speeds stage, the rotating speed in each stage and corresponding running time can freely be controlled, as long as import corresponding parameter once, the rotating speed of rotor can realize automatically that the synchronism of step lifting changes, and has solved the narrower problem of cement products particle size distribution that traditional dynamic powder concentrator is elected in permanent rotating speed state leeward.
Description of drawings
Fig. 1 is the fundamental diagram of vertical flour mill.
Fig. 2 is conventional dynamic powder concentrator drive unit fundamental diagram.
Fig. 3 is conventional dynamic rotor of powder separator rotation speed change figure.
The RRSB particle size distribution figure of the cement that Fig. 4 grinds for traditional ball mill.
The RRSB particle size distribution figure of the cement that Fig. 5 grinds for the traditional vertical flour mill.
Fig. 6 is the dynamic powder concentrator drive unit fundamental diagram of the present invention's control.
Fig. 7 is the control sequence figure of PLC programmable controller of the present invention.
Fig. 8 is the dynamic rotor of powder separator rotation speed change figure of the present invention's control.
Fig. 9 is the RRSB particle size distribution figure of the cement of the dynamic powder concentrator selection by winnowing of the present invention's control.
The specific embodiment
The dynamic powder concentrator drive unit driving principle of the present invention's control, as shown in Figure 6.In the control loop of traditional dynamic powder concentrator drive unit, design has the PLC programmable controller, frequency converter is sent the signal instruction, the frequency of the electric current of control frequency converter output is the variation of step heave period, therefore the output speed of variable-frequency motor produces the variation of step heave period ground synchronously, thereby the synchronization that reaches dynamic rotor of powder separator produces the variation of step heave period, realizes on purpose controlling the target of cement granules grating.
In the inventive method, the rotating speed of setting each stage rotor of dynamic powder concentrator is S
1, S
2, S
3..., S
N, the frequency of corresponding electric current is F
1, F
2, F
3..., F
N, be T the running time of each rotating speed stage correspondence
1, T
2, T
3..., T
N, parameter F and parameter T can be imported according to the requirement input of cement production process once by the Central Control Room operator, and can revise at any time.After instruction is sent, dynamically the rotating speed of rotor of powder separator will enter the cyclically-varying of step lifting automatically.Among the present invention, the control sequence principle of PLC programmable controller, as shown in Figure 7.
Rotor speed changes during the dynamic powder concentrator production run of the present invention's control, as shown in Figure 8.The present invention has changed the constant relatively control method of conventional dynamic powder concentrator rotating speed.Under the ordinary production state, dynamically the rotating speed of rotor of powder separator mediates the step lifting cycle stage, change again and again (N=natural number), and the rotor that can control dynamic powder concentrator with a definite target in view is in the rotating speed in each rotating speed stage and the time of each stage operation.
The RRSB size distribution curve of the cement that the dynamic powder concentrator selection by winnowing of the present invention's control is come out, as shown in Figure 9.The rotor of dynamic powder concentrator, the time of operation is longer relatively in the high rotating speed stage, increase the fine grain content of 1-3 μ m in the cement granularity distribution, the time of operation is moderate relatively in the medium speed stage, stablize the content of 3-32 μ m particles, the time of operation is shorter relatively in the slow-speed of revolution stage, the coarse grained content of restriction＞65 μ m, widen the cement granularity distribution curve thereby reach, make the size distribution of the cement of vertical flour mill grinding be tending towards generally acknowledging in the reasonable grit grading scope, the quality that had both guaranteed the cement of vertical flour mill grinding is up to state standards, and simultaneously, other physical property of cement also meets the instructions for use of concrete industry.
Claims (2)
1. method that realizes the variation of dynamic powder concentrator rotating speed step heave period, it is characterized in that: in the control loop of traditional dynamic powder concentrator drive unit, be provided with the PLC Programmable Logic Controller, by the PLC Programmable Logic Controller frequency converter is sent control instruction, make the frequency of the electric current of frequency converter output be the variation of step heave period, according to motor speed formula n=60f/p, in the formula: the n motor speed, the f power frequency, p motor number of pole-pairs, produce step heave period ground synchronously with the variation of the frequency of the electric current of step heave period variation by the output speed of the variable-frequency motor of Frequency Converter Control and change, thereby the synchronization that reaches dynamic rotor of powder separator produces the purpose of step heave period variation.
2. a kind of method that realizes the variation of dynamic powder concentrator rotating speed step heave period according to claim 1, it is characterized in that: in the PLC Programmable Logic Controller, set the frequency of several electric currents and the time of keeping accordingly with this frequency, the rotating speed of the corresponding corresponding dynamically rotor of powder concentrator of each frequency and time and with this rotating speed corresponding running time, the PLC Programmable Logic Controller sends control instruction according to the frequency in several stages of setting and the running time of each stage correspondence to frequency converter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104615074A (en) * | 2015-02-02 | 2015-05-13 | 响水中联水泥有限公司 | Intelligent control system and method for cement grinding |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201493159U (en) * | 2009-08-10 | 2010-06-02 | 彭光正 | Frequency-change feeding unit of electric-control pulverizing mill control system |
| CN201669137U (en) * | 2009-12-29 | 2010-12-15 | 洛阳宇航重工机械有限公司 | Alumina crust block crushing production line |
| CN102009041A (en) * | 2010-10-13 | 2011-04-13 | 天津精华石化有限公司 | Wind powder-selecting system for column mill |
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- 2013-06-24 CN CN2013102530402A patent/CN103331264A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201493159U (en) * | 2009-08-10 | 2010-06-02 | 彭光正 | Frequency-change feeding unit of electric-control pulverizing mill control system |
| CN201669137U (en) * | 2009-12-29 | 2010-12-15 | 洛阳宇航重工机械有限公司 | Alumina crust block crushing production line |
| CN102009041A (en) * | 2010-10-13 | 2011-04-13 | 天津精华石化有限公司 | Wind powder-selecting system for column mill |
Non-Patent Citations (1)
| Title |
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| 李立君: "高压变频器在炼钢转炉节能减排中的应用", 《科技信息(学术研究)》, no. 20, 31 December 2008 (2008-12-31) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104615074A (en) * | 2015-02-02 | 2015-05-13 | 响水中联水泥有限公司 | Intelligent control system and method for cement grinding |
| CN104615074B (en) * | 2015-02-02 | 2017-03-22 | 响水中联水泥有限公司 | Intelligent control system and method for cement grinding |
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