CN1086900A - Method and device for monitoring powder level in vibrating powder bin - Google Patents
Method and device for monitoring powder level in vibrating powder bin Download PDFInfo
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- CN1086900A CN1086900A CN 92112936 CN92112936A CN1086900A CN 1086900 A CN1086900 A CN 1086900A CN 92112936 CN92112936 CN 92112936 CN 92112936 A CN92112936 A CN 92112936A CN 1086900 A CN1086900 A CN 1086900A
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Abstract
本发明公开了一种振动式粉仓粉位的监测方法 及装置，它采用激振信号发生电路发送一定功率的与 振片的固有频率基本相同的共振频率，由于粉位上下 对振片的阻尼不同，引起振片振动强弱的差异，通过 振片上贴有拾振的压电陶瓷，把振动转换成电信号， 并将信号送到声频信号接收处理电路，根据阻尼影响 接收信号减小的阈值以确定粉仓粉位。本发明结构 简单，操作方便。
The invention discloses a method and device for monitoring the powder level of a vibrating powder silo. It uses an excitation signal generating circuit to send a resonant frequency with a certain power that is basically the same as the natural frequency of the vibrating plate. Different, cause the difference in the strength of vibration of the vibrating piece, through the vibration-picking piezoelectric ceramics attached to the vibrating piece, the vibration is converted into an electrical signal, and the signal is sent to the audio signal receiving and processing circuit, and the threshold value of the received signal is reduced according to the damping effect To determine the powder level of the powder bin. The invention has simple structure and convenient operation.
Description
The present invention relates to powder storehouse powder position monitoring method and device, especially relate to vibrative powder storehouse powder position monitoring method and device.
In process of production owing to need some solid materials of interim storage all to have the feed bin that varies in size, as the bunker of the Pulverized Coal Bin of power plant, cement mill and various storage ash buckets etc.How much that will monitor storage capacity at any time must carry out the monitoring of online in real time to material level.Present level-sensing device in use can be divided into following several according to its application principle, they all exist intrinsic problem.
1. body surface contact.As Weight type, the float-type level-sensing device.The latter is applicable to the liquid level level gauging, and the former not only easily buries the hammer phenomenon during operating cost but also when continuous feed.Do not note also cable breaks taking place.
2. wave reflection detection type.As the ultrasound wave level-sensing device, the millimetre-wave radar level-sensing device.Because material level out-of-flatness during continuous feed, the interference that flying upward of granular material caused and the influence of feed bin wall reflection wave make it measure correctness and greatly reduce especially.
3. sensing formula.As condenser type, differential, photo-electric sensing formula level-sensing device.For the abominable granular material of site environment, not that sensor easily pollutes, damages, be exactly sensitivity is not high, correctness is poor, and the influence factor that is subjected to other is more.
For this reason, above-mentioned several level-sensing device is not applied in the powder storehouse powder position of continuous feed is measured basically.The audio instrument for measuring material level that uses adopts acoustic resonant cavity principle and spectrum estimating method to determine controlling level at present.Though this method has certain advance, also have some shortcomings and problem.At first can't be general in the powder storehouse of different size different geometries.Secondly signal processing analysis is very complicated, must the expense costliness, reliability is not good.
The purpose of this invention is to provide a kind of vibrative powder storehouse powder position monitoring method and device.
In order to achieve the above object, the present invention takes following measures, adopt accumulation signal generation circuit to send the essentially identical resonant frequency of the natural frequency with the sheet that shakes of certain power, because the powder position is up and down to the damping difference of the sheet that shakes, cause the difference of the sheet vibration strong or weak that shakes, by the piezoelectric ceramics that posts pick-up on the sheet that shakes vibration is converted to electric signal, and signal is delivered to the audio signal receiving processing circuit, influence threshold value that received signal reduces to determine the monitoring method of powder storehouse powder position according to damping.According to the powder storehouse powder position monitoring device of this method design, it has the vibrating arm in direct insertion powder storehouse, is provided with a plurality of sheets that shake that are arranged in order on vibrating arm, posts the piezoelectric ceramics of pick-up on the sheet that shakes; Multiply signal feed one end respectively with the sheet that shakes on piezoelectric ceramics join, the other end and accumulation signal generation circuit, the audio signal treatment circuit joins, audio signal treatment circuit and powder position display circuit join.
Advantage of the present invention is the monitoring that is applicable to all solid, powdery materials.Vibrating arm is inserted as a complete assemblies at Cang Ding, is convenient to safeguard and maintenance.Signal adopts long-distance transmissions, and is easy to operate.The monitor of control desk adopts integrated circuit, and volume is little, the life-span is high, simple in structure.Compare with the audio instrument for measuring material level of present use, because whole feed bin need only be vibrated the small pieces sheet that shakes as resonator cavity, so the vibration signal transmitted power can reduce greatly.
Be described in further detail below in conjunction with accompanying drawing.
Fig. 1 is a vibrative powder storehouse powder position monitoring device block diagram;
Fig. 2 is the frequency response curve of forced vibration under the effect of simple harmonic quantity power.
The resonant frequency that equates substantially with sheet 2 natural frequencys of shaking that accumulation signal generation circuit 5 sends certain power.This signal is delivered to piezoelectric ceramics on a plurality of sheets 2 that shake on the vibrating arm 1 by signal feed, and the sheet that shakes is vibrated.Vibrating arm 1 directly inserts in the powder storehouse 4.The sheet that shakes on the bar have more than the powder position and have below the powder position.The sheet that shakes more than the powder position is not subjected to the damping of powder pressure, and the sheet that shakes below the powder position has been subjected to the damping of powder pressure.According to vibration characteristics, about the resonant frequency scope, vibration is subjected to damping will make amplitude reduce greatly.Fig. 2 has represented the frequency response curve of forced vibration under the effect of simple harmonic quantity power.Horizontal ordinate u is the perturbed force frequencies omega among the figure
eRatio with natural frequency ω.During u=1, be the perturbed force frequencies omega
eEqual natural frequency ω, resonate.Ordinate β
dBe dynamic coefficient, it is dynamic amplitude A and static displacement X
StRatio.Among the figure on the curve family D be damping.As can be seen from Figure 2, when object resonates under external force, there is then significant reduction in vibration as damping.The piezoelectric ceramics that around this principle posts pick-up on the sheet 2 that shakes simultaneously is converted to electric signal to vibration.This signal is delivered to audio signal receiving processing circuit 6 by multiply signal wire 3.This signal processing circuit influences threshold value that received signal reduces to determine that each sheet position that shakes has powder and still do not have powder according to damping.Show by powder position display circuit 7 at last.The benefit of this instrument also is and can puts up a bridge too greatly and monitor owing to humidity in the storehouse powder.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92112936 CN1086900A (en) | 1992-11-07 | 1992-11-07 | Method and device for monitoring powder level in vibrating powder bin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92112936 CN1086900A (en) | 1992-11-07 | 1992-11-07 | Method and device for monitoring powder level in vibrating powder bin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1086900A true CN1086900A (en) | 1994-05-18 |
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ID=4946164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92112936 Pending CN1086900A (en) | 1992-11-07 | 1992-11-07 | Method and device for monitoring powder level in vibrating powder bin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1086900A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439877C (en) * | 2005-06-03 | 2008-12-03 | 都灵无线基金会 | Method and device for detecting parameters of liquid metal in a container |
| CN101331388B (en) * | 2005-12-27 | 2011-02-16 | Vega格里沙贝两合公司 | Level measuring arrangement with a safety cut-out at high temperatures |
| CN109211357A (en) * | 2013-05-15 | 2019-01-15 | 弗萨姆材料美国有限责任公司 | Ultrasonic Level Sensing System |
| CN109374086A (en) * | 2018-10-18 | 2019-02-22 | 新奥科技发展有限公司 | A material level measuring device and material conveying system |
| US11112450B2 (en) * | 2018-09-11 | 2021-09-07 | Changxin Memory Technologies, Inc. | Method and apparatus for controlling tester, medium and electronic device |
-
1992
- 1992-11-07 CN CN 92112936 patent/CN1086900A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439877C (en) * | 2005-06-03 | 2008-12-03 | 都灵无线基金会 | Method and device for detecting parameters of liquid metal in a container |
| CN101331388B (en) * | 2005-12-27 | 2011-02-16 | Vega格里沙贝两合公司 | Level measuring arrangement with a safety cut-out at high temperatures |
| CN109211357A (en) * | 2013-05-15 | 2019-01-15 | 弗萨姆材料美国有限责任公司 | Ultrasonic Level Sensing System |
| US11112450B2 (en) * | 2018-09-11 | 2021-09-07 | Changxin Memory Technologies, Inc. | Method and apparatus for controlling tester, medium and electronic device |
| CN109374086A (en) * | 2018-10-18 | 2019-02-22 | 新奥科技发展有限公司 | A material level measuring device and material conveying system |
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