CN1050439A - Electronic belt scale proportion batching method and device - Google Patents
Electronic belt scale proportion batching method and device Download PDFInfo
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- CN1050439A CN1050439A CN 89107099 CN89107099A CN1050439A CN 1050439 A CN1050439 A CN 1050439A CN 89107099 CN89107099 CN 89107099 CN 89107099 A CN89107099 A CN 89107099A CN 1050439 A CN1050439 A CN 1050439A
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Abstract
A proportional batching method and a proportional batching device of an electronic belt scale for a batching process in cement production. In order to improve the proportioning precision of materials, an electronic control system is adopted to continuously weigh in sections and alternately weigh in sections according to a preset time sequence for each belt scale conveying materials with different components. The disadvantage that the proportioning error is increased because materials with greatly different weights are measured by the same metering device is overcome. The electronic control system adopts a digital circuit or a microcomputer. In order to simplify the structure, a scale body with a mechanical platform scale structure is adopted, so that the weight of a single platform is not more than 150 kg. The device can ensure that the proportioning precision of the materials is better than 1 percent. It is also suitable for compounding in chemical and metallurgical industries.
Description
The present invention relates to a kind of belted electronic balance ratio distribution and device thereof that is applied to proportioning process in the manufacture of cement.
In commercial production such as cement, proportioning accuracy is most important to product quality, thus developed the belted electronic balance of various ways, in the hope of improving distributing precision.
At present comparatively advanced in the world speed governing roller-type electronic belt scale (consult " cement " 1987 the 5th phase the 24th page), be characterized in, by the carrying roller and the frame of weighing, utilize load sensor to gather the instantaneous weight of material on the belt, stablize its flow to regulate belt speed.The structure of this scale is huge, costs an arm and a leg, and the factor that influences measuring accuracy is more, and therefore middle-size and small-size cement mill is difficult to adopt.
At home, comparatively advanced constant speed single swing arm type belted electronic balance.It is fit to the production scale of middle-size and small-size cement mill.JE-3G type cantilevered belt scale (consulting its technical specification) as the production of Hangzhou building materials Electronic Equipment Factory.Be characterized in adopting the structure of single-cantilever scale body and the method for continuous measurement,, rely on load sensor to gather the online weight of streams when bracketed part, come regime flow with the size of regulating feeding coal promptly by the cross reed, and constant belt travelling speed.But this scale in operational process often because the material skewness so that cause that material centre-of gravity shift changes lever ratio, thereby causes error in dipping.
This problem is particularly serious in manufacture of cement, because material is granular, grain size is very inhomogeneous.In order to overcome above-mentioned deficiency, China's number of patent application is that a patented claim of CN86207515U discloses a kind of system controlled by computer double-cantilever belt weigher, and it adopts double-cantilever structure, and weight of material is affacted on two or four sensors simultaneously.Though this scale has been eliminated the error in dipping that the material skewness causes, owing to set up sensor, so the error that sensor is introduced will increase.
Yet, above-mentioned various forms of belted electronic balance also exists some common shortcomings: 1. the weight of material is not directly to be added on the load sensor, but the transmission by the cross reed, therefore in fact the weight of material and the induction amount of sensor are a kind of indirect relations, though the elasticity of cross reed can play the effect that absorbs vibration to a certain extent, this transmission also can be introduced error in dipping; 2. though these belt conveyer scales all adopt microcomputer control, the inreal precision problem that effectively solves material proportion is because they adopt same measuring apparatus to remove the different component materials that claim that proportioning weight differs greatly.
The objective of the invention is to each belted electronic balance of carrying different component materials is carried out the method that contiguous segmentation is weighed and weighed with alternatively, sectionally, and adopt scale structure simple in structure and electronic control system to finish the task of improving the material proportion precision
Technical conceive of the present invention: in manufacture of cement, the basic reason that can not really effectively solve the material proportion precision is to adopt same measuring apparatus, the material of the different components that differ greatly of going to weigh.This point has been ignored by people always.Like this, even the measuring accuracy of separate unit belted electronic balance is very high, but differ greatly so that the material of different components weighs under the situation about also differing greatly at material proportion, the measuring accuracy of main component material can be better than one of percentage, and the error in dipping of group's part material can be very big.Therefore, whole mixing ratio error is also just very big.Bigger material particles can cause feed inaccurate simultaneously, also can introduce very big error to group's part material, and can directly be added on the mixing ratio error.
Now being respectively 75%, 12%, 7%, 4.5% and 1.5% with a, b, c, d and five kinds of material proportions of e is that example illustrates this problem.Its weight ratio is respectively: a: b=6.25, a: c=10.7, a: d=16.7, a: e=50, it is ubiquitous in the batching of manufacture of cement that the weight of different material differs great disparity like this.If the online weight of a material is 20kg, and the online weight of b, c, d and e is respectively 3.2kg, 1.9kg, 1.2kg and 0.4kg.If the error in dipping of device is ± 50g, though the error in dipping of material a is ± 0.25%, and the error in dipping of Materialien reaches ± 12.5%, therefore, the mixing ratio error of material, i.e. R '=e/a or R=e/(a+b+c+d+e) error also be about ± 12.5%.As seen the measuring apparatus of same precision under the situation that online weight differs greatly, can cause very big error to weighing of group's part material, thereby cause very big mixing ratio error.
Except the error in dipping of belt conveyer scale, feed can not stop also can to cause the error of material metering in real time when sectional-weighing.Even can stop feed in real time, the minority bulky grain in group's part material brings very big relative error also can for weighing of group's part material.The grain size of material is general many below 20g, but a few granules can reach 60g or higher.Even thereby accomplish and stop feed in real time, but if run into big bulky grain to 50g, so much one or few weighting error that will cause pact ± 50g.This a small amount of to group's part material is weighed and also will be caused very big relative error, thereby causes very big mixing ratio error.And this almost is unavoidable in manufacture of cement.As seen, in this case, improving the measuring accuracy of belt conveyer scale merely, is nonsensical to the raising of distributing precision.
The method that the present invention adopts contiguous segmentation to weigh and weigh and combine with alternatively, sectionally, the online weight of raising group part material, the relative error that reduces to measure, thus reduce mixing ratio error.
So-called contiguous segmentation is weighed and alternatively, sectionally is weighed, and is exactly under given proportioning, the belt conveyer scale of carrying different component materials is carried out the segmentation feed, respectively to every section material metage.Promptly use same measuring apparatus, claim close weight, every section of different component materials is weighed reach close precision, and its proportion relation how much realizing by feed and weigh number of times (dutycycle of segmentation).The sectional-weighing of main component material is continuous, the hocketing according to the order of sequence of the sectional-weighing of group's part material.
In view of the above, press the load-carrying ability of belt conveyer scale and the ratio requirement of different material, make the approaching as far as possible principle of online weight of various materials, set up contiguous segmentation and weighed and the alternatively, sectionally weighing technology.
For implementing above-mentioned technical conceive, will carry the belted electronic balance of different component materials to be connected with electronic control system.Its belted electronic balance is made up of band conveyor, scale body, electric vibrating feeder and election weighing system, and its electronic control system is made up of digital circuit or microcomputer.
The present invention adopts mechanical platform scale structure for simplifying scale structure, and band conveyor directly is hung on the scale body underframe by four square rings and suspension ring.The lever construction of mechanical platform scale is adopted in metering, is made up of scale and counterweight.For realizing the real-time control of feed, constitute zero-crossing detecting device by the double hook extension spring with near switch.One end of described extension spring is connected with scale, and the other end is fixed on the underframe, and extension spring is stressed generation elastic force when material does not reach given weight, and extension spring resetted and loses elastic force when material reached given weight.This moment, near the switch duty of overturning immediately.
So-called detection at zero point is exactly the mechanical zero of scale when measuring the equilibrium of couples at mechanical lever two ends.Owing to adopted the extension spring structure, aimed at and determine measuring key effect.In electric vibrating feeder fed in raw material process to band conveyor, when the weight at line material reached given weight, because the inertia effect scale can not move immediately, then electric vibrating feeder can not stop feed immediately.Therefore, this hysteresis phenomenon will cause quantitatively inaccurate.So,, give the initial velocity of scale slowly to make progress by extension spring when the online weight of material during near given weight.When the online weight of material reached given weight, the scale collimation line just can arrive the mechanical zero position immediately exactly.At this moment also close electric vibrating feeder immediately near switch motion.After scale arrived the mechanical zero position, the essential acting force that breaks away from extension spring became the state that freely swings.For this reason, in the extension spring positive stop hook, set up stop, with extension spring to the effect travel limits of scale in the following scope of mechanical zero.
Advantage of the present invention and effect: ratio distribution that is provided and device thereof can make the distributing precision of material be better than 1%.The raising of material proportion precision in manufacture of cement will bring a series of benign cycles: improve the burn-ability of material, make thermal regulation stable, improve the quality of burning till; The belt conveyer scale scale structure that is adopted is simple, has reduced complete machine weight, helps improving the sensitivity of belt conveyer scale, makes the cheap of whole device again.This device is particularly suitable for the production scale of Small and Middle Scale Cement Plants, also is suitable for the batching of industries such as chemical industry and metallurgy.
Accompanying drawing 1 is the structural drawing of numerical control series electronic belt conveyer scale ratio batching set-up.
Accompanying drawing 2 is the synoptic diagram of microcomputer series electronic belt conveyer scale ratio batching set-up.
Accompanying drawing 3 is the belted electronic balance structural drawing.
Accompanying drawing 4 is the zero-crossing detecting device structural drawing.
Accompanying drawing 5 is the load sensor installation diagram.
Accompanying drawing 6 is belt conveyer scale motion graphics display principles figure.
Accompanying drawing 7 is the work schedule arrangement plan.
Most preferred embodiment: in conjunction with the accompanying drawings device is further described.
1. (with five kinds of materials is example to numerical control series electronic belt conveyer scale ratio batching set-up, see accompanying drawing 1) by erasable read-only memory (EPROM) 26, Combinational Logic Control circuit 1,2,3,4 and 5, photoelectrical coupler 6,7,8,9,10,11,12,13,14 and 15, electric vibrating feeder thyristor gating circuit 16,17,18,19 and 20, zero- crossing detecting device 21,22,23,24 and 25, belted electronic balance A, B, C, D and E, belt conveyer scale motion graphics display 27 and audible-visual annunciator 28 are formed.
In EPROM26 internal memory such as the accompanying drawing 7 68 provide be applied to five kinds of materials the time work schedule configuration, Combinational Logic Control circuit 1,2,3,4 and 5 through the thyristor gating circuit 16,17,18,19 and 20 of photoelectrical coupler 6,8,10,12 and 14 control electric vibrating feeders, makes electric vibrating feeder work respectively.When the material on each belt conveyer scale reaches given weight (given put by counterweight), their zero-crossing detecting devices 21,22,23,24 and 25 are separately closed its electric vibrating feeder respectively through photoelectrical coupler 7,9,11,13 and 15 by Combinational Logic Control circuit separately.Here adopt the photoelectricity coupling can strengthen interference free performance.
Belted electronic balance A carries main component material, its contiguous segmentation feed and weighing.Other belted electronic balances B, C, D and E be alternatively, sectionally feed and weighing then.Combinational Logic Control circuit 1,2,3,4 and 5 control belt conveyer scale dynamic displays 27 are dynamic to show the operation of material on belt simultaneously.When work schedule sends pick-off signal, and when not reaching given weight, differentiate, make audible-visual annunciator 28 send warning through the Combinational Logic Control circuit.
Zero- crossing detecting device 21,22,23,24 and 25 structure are made of near switch 57 and stop 70 double hook extension spring 56 as shown in Figure 4.Double hook extension spring 56 is connected with scale 48 with a end near switch 57, and the other end and stop 70 are fixed on the scale body underframe.Double hook extension spring 56 comprises main hook 561, positive stop hook 562 and adjusting screw 563.Whole zero-crossing detecting device is in a protective cover 49.
The structure of belt conveyer scale motion graphics display 27 as shown in Figure 6.Form an endless-belt figure and the row's simulation material operation dynamic graphics that is positioned at its upper end by light emitting diode.When electric vibrating feeder when belt conveyer scale is reinforced, reinforced signal and clock signal be by entering counter 63 timing with door 62, made by 4-10 code translator 64 and R-S trigger 65 to show that material moves dynamic row's light emitting diode and jumps bright from left end successively to right-hand member.When stopping to feed in raw material, the light emitting diode that has lighted is just latched in random state by R-S trigger 65, to show the position of material on belt.When the work schedule of EPROM sends pick-off signal, by removing end 66 latch mode is removed, enter original state of following one-period.Because of the operation of clock signal and belt synchronously, so that graphic alphanumeric display simulates the operation of material on belt conveyer scale intuitively is dynamic.
2. (with five kinds of materials is example to microcomputer series electronic belt conveyer scale ratio batching set-up, see accompanying drawing 2) by single card microcomputer 30, keyboard 29, photoelectrical coupler 6,8,10,12 and 14, the thyristor gating circuit 16,17,18,19 and 20 of electric vibrating feeder, belted electronic balance A, B, C, D and E, load sensor 41,42,43,44 and 45, discharge circuit 36,37,38,39 and 40, mould/number conversion 31,32,33,34 and 35, belt conveyer scale motion graphics display 27 and audible-visual annunciator 28 are formed.
Output and proportioning data that single card microcomputer 30 is keyed in by (by keyboard 29), automatically calculate the given weight of various each sections of material, by 68 work schedules when being used for five kinds of materials in the accompanying drawing 7, through photoelectricity Coupling Control electric vibrating feeder thyristor gating circuit 16,17,18,19 and 20, make electric vibrating feeder work.Load sensor 41,42,43,44 and the 45 online weight of gathering material on the belt conveyer scale, after discharge circuit 36,37,38,39 and 40 amplifications and mould/number conversion 31,32,33,34 and 35 conversions, the given weight numeric ratio that calculates with single card microcomputer 30, when reaching given weight, single card microcomputer 30 sends instruction, closes electric vibrating feeder through the photoelectricity coupling.
The installation position of load sensor is shown in Fig. 5, and middle hook 59 is connected with scale 48, is pressed on the load sensor 60.Load sensor 60 is screwed on support 61.Add protective cover 49.Here keeping scale is for load sensor is demarcated.
The structure of belted electronic balance A, B, C, D and E is made up of band conveyor, scale body and election weighing system as shown in Figure 3.Band conveyor comprises light-weight electric cylinder 46, belt 50 and driven cylinder 51.Here avoid using chain drive,, improve sensitivity to alleviate conveyor weight.The scale body adopts mechanical platform scale structure, is made up of scale 48, counterweight 47, lever construction 55 and scale body underframe 54.Election weighing system is made up of zero-crossing detecting device or load sensor, is installed in the protective cover 49.Band conveyor directly is hung on the scale body underframe 54 by four square rings 52 and suspension ring 53.Whole belted electronic balance is simple and compact for structure, and separate unit weight is no more than 150kg.
Accompanying drawing 7 has provided three kinds of work schedule arrangement plans that adapt to the different plant species batching.67 is sequential charts of four kinds of material proportions among the figure, four belted electronic balance A, B, C and D, per hour feed is weighed and is respectively 450 times, 80 times 80 times and 40 times, and the belted electronic balance A that carries main component material is that contiguous segmentation is weighed, and the cycle (being each feed time) is 8 seconds.Belted electronic balance B, the C of conveying group part material and D are that alternatively, sectionally is weighed, and the cycle is 18 seconds.68 is sequential charts of five kinds of material proportions among the figure, five belted electronic balance A, B, C, D and E, per hour feed is weighed and is respectively 450 times, 80 times, 80 times, 40 times and 40 times, and the belted electronic balance A that carries main component material is that contiguous segmentation is weighed, and the cycle is 8 seconds.Belted electronic balance B, C, D and the E of conveying group part material is that alternatively, sectionally is weighed, and the cycle is 15 seconds.69 also is the sequential chart of five kinds of material proportions among the figure.Different is, and main component material is carried by two belted electronic balance A1 and A2, its per hour feed weigh and be 300 times.Their contiguous segmentations are weighed, and the cycle is 12 seconds.Group's part material is carried by four belted electronic balance B, C, D and E, its per hour feed weigh and be respectively 80 times, 80 times, 40 times and 40 times, their alternatively, sectionallies are weighed, the cycle is 12 seconds.
Mixing ratio error when now being applied to five kinds of proportioning materials is listed as follows (by 15 tons/hour, the error in dipping of ± 50g calculates):
The batch ingredients online weight kg error in dipping of the number of times % mixing ratio error % that per hour weighs
a 75 450 25 0.20 0.25
d 4.5 40 16.875 0.30 0.34
e 1.5 40 5.625 0.89 0.90
[notes] wherein the mixing ratio error of a are Ra=a/(a+b+c+d+e) error, the rest may be inferred by analogy.
This device is applied to the actual effect in the manufacture of cement: weigh and the alternatively, sectionally weighing technology because of adopting contiguous segmentation, effectively reduced mixing ratio error.Practical application shows, under the stable situation of materials quality, the qualification rate of every controlling index all can reach more than 90%.
Claims (9)
1, a kind of belted electronic balance ratio distribution, it is included under the given proportioning, the belt conveyer scale of carrying different component materials is carried out the segmentation feed, respectively to every section material weighing, it is characterized in that claiming close weight, every section of different component materials is weighed reach close precision, and how many its proportion relations is by feed and realizing of weighing with same measuring apparatus, the sectional-weighing of main component material is continuous, and the sectional-weighing of group's part material is to hocket according to the order of sequence.
2, ratio distribution according to claim 1, it is characterized in that under four kinds of material proportions, four belted electronic balance A, B, C and D, per hour feed is weighed and is respectively 450 times, 80 times, 80 times and 40 times, the belted electronic balance A that carries main component material is that contiguous segmentation is weighed, cycle is 8 seconds, and carrying belted electronic balance B, the C of three kinds of group's part materials and D respectively is that alternatively, sectionally is weighed, and the cycle is 18 seconds.
3, ratio distribution according to claim 1, it is characterized in that under five kinds of material proportions, five belted electronic balance A, B, C, D and E, per hour feed is weighed and is respectively 450 times, 80 times, 80 times, 40 times and 40 times, the belted electronic balance A that carries main component material is that contiguous segmentation is weighed, cycle is 8 seconds, and belted electronic balance B, C, D and the E that carries four kinds of group's part materials respectively is that alternatively, sectionally is weighed, and the cycle is 15 seconds.
4, ratio distribution according to claim 1, it is characterized in that under five kinds of material proportions, carrying two the belted electronic balance A1 and the A2 of main component material is that contiguous segmentation is weighed, cycle is 12 seconds, per hour feed is weighed and is 300 times, belted electronic balance B, C, D and the E that carries four kinds of group's part materials respectively is that alternatively, sectionally is weighed, and the cycle is 12 seconds, and per hour feed is weighed and is respectively 80 times, 80 times, 40 times and 40 times.
5, a kind of belted electronic balance ratio batching set-up, comprise the belted electronic balance of forming by band conveyor, scale body and election weighing system, and electric vibrating feeder, the belted electronic balance that it is characterized in that the different component materials of each conveying is connected with electronic control system, control carries the belted electronic balance of main component material that its contiguous segmentation is weighed and the belted electronic balance of controlling conveying group part material makes its alternatively, sectionally weighing electronic control system, is made up of digital circuit or microcomputer.
6, ratio batching set-up according to claim 5, it is characterized in that described digital circuit is made up of the thyristor gating circuit and the zero-crossing detecting device of the Combinational Logic Control circuit of erasable read-only memory and Ge Lu, photoelectrical coupler, electric vibrating feeder, zero-crossing detecting device is by the double hook extension spring, constitute near switch and stop.
7, according to claim 5 or 6 described ratio batching set-ups, it is characterized in that described electronic control system also comprises a belt conveyer scale motion graphics display and an audible-visual annunciator, belt conveyer scale motion graphics display is by forming with door, counter, 4-10 line code translator, R-S trigger and light emitting diode.
8, ratio batching set-up according to claim 5, the scale body that it is characterized in that described belted electronic balance adopts mechanical platform scale structure, it is made up of the lever construction and the scale body underframe of scale, counterweight, mechanical platform scale, and band conveyor directly is hung on the scale body underframe by four square rings and suspension ring.
9, ratio batching set-up according to claim 5 is characterized in that described belted electronic balance can adopt the roller-type structure, or the single-cantilever structure or double-cantilever structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89107099 CN1050439A (en) | 1989-09-19 | 1989-09-19 | Electronic belt scale proportion batching method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89107099 CN1050439A (en) | 1989-09-19 | 1989-09-19 | Electronic belt scale proportion batching method and device |
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| CN1050439A true CN1050439A (en) | 1991-04-03 |
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| CN 89107099 Pending CN1050439A (en) | 1989-09-19 | 1989-09-19 | Electronic belt scale proportion batching method and device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839758A (en) * | 2010-04-08 | 2010-09-22 | 马建伟 | Quantitative weighing predictor of scale |
| CN102527486A (en) * | 2010-12-17 | 2012-07-04 | 江苏科行环境工程技术有限公司 | Balance control system for grinding quantity of horomill |
| CN103844341A (en) * | 2012-12-04 | 2014-06-11 | 山东中烟工业有限责任公司青岛卷烟厂 | High-precision material blending equipment and blending method |
| CN109591174A (en) * | 2018-11-12 | 2019-04-09 | 中国水利水电科学研究院 | A kind of aggregate batching method of civil material |
| CN110806252A (en) * | 2018-08-06 | 2020-02-18 | 江苏友和工具有限公司 | Intelligent weighing method for manufacturing diamond saw blade |
-
1989
- 1989-09-19 CN CN 89107099 patent/CN1050439A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839758A (en) * | 2010-04-08 | 2010-09-22 | 马建伟 | Quantitative weighing predictor of scale |
| CN102527486A (en) * | 2010-12-17 | 2012-07-04 | 江苏科行环境工程技术有限公司 | Balance control system for grinding quantity of horomill |
| CN103844341A (en) * | 2012-12-04 | 2014-06-11 | 山东中烟工业有限责任公司青岛卷烟厂 | High-precision material blending equipment and blending method |
| CN103844341B (en) * | 2012-12-04 | 2016-02-10 | 山东中烟工业有限责任公司青岛卷烟厂 | High-precision material is mixed and is arranged standby and blending |
| CN110806252A (en) * | 2018-08-06 | 2020-02-18 | 江苏友和工具有限公司 | Intelligent weighing method for manufacturing diamond saw blade |
| CN109591174A (en) * | 2018-11-12 | 2019-04-09 | 中国水利水电科学研究院 | A kind of aggregate batching method of civil material |
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