CN102506936A - Coal load sensor - Google Patents
Coal load sensor Download PDFInfo
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- CN102506936A CN102506936A CN2011103412387A CN201110341238A CN102506936A CN 102506936 A CN102506936 A CN 102506936A CN 2011103412387 A CN2011103412387 A CN 2011103412387A CN 201110341238 A CN201110341238 A CN 201110341238A CN 102506936 A CN102506936 A CN 102506936A
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Abstract
The invention provides a coal load sensor, which comprises an acceleration sensor module, a signal conditioning module, an analog-to-digital conversion module, a digital signal processor, and a digital-to-analog conversion and signal conditioning module which are sequentially connected through signals, and a power module, wherein the power module provides power for the acceleration sensor module, the signal conditioning module, the analog-to-digital conversion module, the digital signal processor, the digital-to-analog conversion and signal conditioning module; and the acceleration sensor module is connected to a supporting shaft of a coal mill. The invention also provides a coal load detection method. The novel sensor for acquiring the coal load by measuring the vibrating acceleration of a bearing continuously analyzes and processes vibration signals in real time, namely the so-called parallel working mode is greatly different from the serial working mode of previous programs, so that objective characteristic signals can be really reflected.
Description
Technical field
The present invention relates to sensor technical field, especially relate to a kind of coal load quantity sensor that is used for fuel-burning power plant bowl mill pulverized coal preparation system.
Background technology
At present, the automatic control problem of fuel-burning power plant bowl mill pulverized coal preparation system is failed fine solution for a long time always, and one of it is crucial is the measurement difficulty relatively of the coal load quantity in the balling drum.For many years, the detection of coal load quantity is a difficult problem always in the bowl mill, and the principal element that constitutes this difficult problem has three: ⒈ does not have a kind of direct measurement means; ⒉ can not find a believable process variable as the foundation of demarcating; Modulation and these modulation factors itself that each possible indirect measurement method of ⒊ all receives a lot of other factorses still have uncertainty.Reflect that with the useful cylinder of the method for usual employing gateway differential pressure signal coal load quantity changes, but this method dynamic response is slow, and this signal also receives the influence of the factors such as air quantity, blast and temperature that flow through cylinder, poor reliability.
Publication number is the Chinese invention patent of CN1836784; Open day is on September 27th, 2006; Invention and created name is " a kind of internal memory coal quantity measuring method of heat engine plant canister type steel ball coal pulverizer "; This disclosure of the Invention a kind of method of utilizing sound transducer to detect coal load quantity in the bowl mill, it adopts two sound transducers to measure ball mill barrel noise and ground unrest simultaneously, to eliminate influence of background noise; Take to extract the method for characteristic spectra self-energy, will with the irrelevant noise filtering of interior coal load quantity information.The measurement sensitivity and the accuracy of this method all have much room for improvement.
Summary of the invention
In view of this, be necessary to be directed against the problem that background technology is mentioned, a kind of coal load quantity sensor that can detect the coal load quantity in the balling drum more accurately is provided.
The present invention realizes through following technical scheme:
A kind of coal load quantity sensor; It comprises an acceleration sensor module, a signal condition module, an analog-to-digital conversion module, a digital signal processor and a digital-to-analog conversion and signal condition module that sequential signal connects; Also comprise a power module; It is said acceleration sensor module, signal condition module, analog-to-digital conversion module, digital signal processor, digital-to-analog conversion and signal condition module for power supply, and said acceleration transducer is connected on the coal pulverizer bolster.
Said acceleration transducer adopts direct current 24V power supply, and it exports the mV magnitude voltage signals, and this voltage signal is transferred to said signal condition module.
After said signal condition module is received said voltage signal, carry out signal filtering, carry out voltage signal then and amplify, and the voltage signal after will amplifying transfers to said analog-to-digital conversion module.
Said analog-to-digital conversion module adopts the voltage signal after 16 high-precision AD chips amplify signal to gather, and converts this voltage signal to digital signal, again with this digital data transmission to said digital signal processor.
The digital signal of said digital signal processor after to analog to digital conversion done FFT, and the power in the selected frequency band is carried out integration, averages after repeatedly handling, and obtains the mean value of coal load quantity data-signal.
Said digital-to-analog conversion and signal condition convert the coal load quantity data-signal of digital signal processor gained to voltage signal through the DA chip, change current circuit output 4-20mA current signal through a voltage again.
Said acceleration transducer is connected with a viewing lamp circuit with a toggle switch, to realize that acceleration transducer is carried out parameter correction and adjustment.
A kind of coal load quantity detection method, it may further comprise the steps:
Survey coal pulverizer bearing vibration acceleration, and output mV magnitude voltage signals;
Said voltage signal is carried out signal filtering, carry out voltage signal then and amplify;
Voltage signal to after the signal amplification is gathered, and converts this voltage signal to digital signal;
Said digital signal is done FFT, and the power in the selected frequency band is carried out integration, average after repeatedly handling, obtain the mean value of coal load quantity data-signal;
Convert the coal load quantity data-signal of gained to voltage signal, change the current signal of current circuit output through a voltage again as the coal load quantity signal.
8, a kind of coal load quantity detection method is characterized in that it may further comprise the steps:
Survey coal pulverizer bearing vibration acceleration, and output mV magnitude voltage signals;
Said voltage signal is carried out signal filtering, carry out voltage signal then and amplify;
Voltage signal to after the signal amplification is gathered, and converts this voltage signal to digital signal;
Said digital signal is done FFT, and the power in the selected frequency band is carried out integration, average after repeatedly handling, obtain the mean value of coal load quantity data-signal;
Convert the coal load quantity data-signal of gained to voltage signal, change the current signal of current circuit output through a voltage again as the coal load quantity signal.
The scope of said current signal as the coal load quantity signal is 4-20mA.
Compared with prior art; The present invention possesses following advantage: the present invention is through measuring the novel sensor that the bearing vibration acceleration obtains coal load quantity; Analysis and processing have been realized to the continuous real-time of vibration signal; Promptly so-called " walking abreast " working method, and " serial " working method of big different and former program so can reflect the clarification of objective signal more realistically.
Description of drawings
Fig. 1 is the modular structure synoptic diagram of the embodiment of the invention.
Embodiment
As shown in Figure 1, the coal load quantity sensor of the embodiment of the invention comprises a power supply, an acceleration transducer, a signal condition module, an analog-to-digital conversion module, a digital signal processor, a digital-to-analog conversion and signal condition module.Said power supply is electrically connected with said acceleration sensor module, signal condition module, analog-to-digital conversion module, digital signal processor, digital-to-analog conversion and signal condition module, is these module for power supply.Acceleration sensor module, signal condition module, analog-to-digital conversion module, digital signal processor, digital-to-analog conversion and signal condition sequence of modules signal connect.
Said acceleration transducer is installed on the coal pulverizer back shaft; Said acceleration transducer adopts the 24DCV power supply; It exports the mV magnitude voltage signals, and this voltage signal is transferred to said signal condition module, and this mV magnitude voltage signals is the vibration acceleration signal of coal pulverizer bolster.
Said signal condition module is a voltage amplifier circuit, after it receives the voltage signal of acceleration transducer, carries out signal filtering, carries out voltage amplification then.
Said analog-to-digital conversion module is an AD sample circuit, and it adopts the voltage signal after 16 high-precision AD chips amplify signal to gather, and converts this voltage signal to digital signal.
Said digital signal processor (Digital Signal Processing; DSP) digital signal after the analog to digital conversion is done fast Fourier transform (FFT); And the power in the selected frequency band carried out integration, and average after repeatedly handling, obtain the mean value of coal load quantity data-signal.In the present embodiment, said digital signal processor adopts DSP (Digital Signal Processing, digital signal processing) chip.
Said digital-to-analog conversion and signal condition module are DA change-over circuits; Its coal load quantity data-signal with the digital signal processor gained converts voltage signal to through the DA chip; Change current circuit output 4-20mA current signal through a voltage again, this current signal is the coal load quantity signal.
Experiment shows with analysis, and the method that the bear vibration acceleration of the bolster through measuring coal pulverizer obtains coal load quantity is a kind of indirect measurement method feasible under the present circumstances.The interference that this measuring method can not also can receive other factors exceptionally as: the vibration that the vibration that the coal-grinding motor is introduced, gearbox gear engagement are introduced, the vibration that blower fan is introduced, through coal chute and wind powder pipe introducing from the vibration of other subsystem etc.; Even come the vibration in the autogenous grinding bucket also to comprise collision, the collision between the steel ball, coal and the steel ball of steel ball and liner plate and the collision of coal and liner plate etc.; But than rejecting other process variable that is coupled; Collecting under the prerequisite of abundant data, these additional vibratory still are relatively easy filtering.
With the coal load quantity correlativity maximum be steel ball and the energy of liner plate collision, analysis test of many times result can assert that these energy mainly are distributed in the scope of 2KHz ± 1KHz.Fortunately, the vibration energy of coal-grinding motor, Powder discharging fan, wheel box is basically at this beyond frequency range.That is to say: if can in 2KHz ± 1KHz scope, limit the zone of a factor affecting such as the dynamic compensate for wear of ability, give filtering preferably again, then should be able to reach the measuring accuracy that can be used for controlling.The sensing range of acceleration transducer surpasses 2KHz ± 1KHz, is in detected vibration data, to analyze data in 1KHz～3KHz scope.
Coal load quantity characteristic signal sensor will be done fast Fourier transform (FFT) by dsp chip from the characteristic signal that the coal pulverizer back shaft is gathered; And the power in the selected frequency band carried out integration; Average after handling for more than 100 time, at last through electric current loop output averaged result.
This coal load quantity sensor has also been made great change on program architecture; Analysis and processing have been realized to the continuous real-time of vibration signal; Promptly so-called " walking abreast " working method; And " serial " working method of big different and former program so can reflect the clarification of objective signal more realistically.
This coal load quantity sensor just can satisfy most application basically under the default setting that dispatches from the factory, as long as it is excessive to guarantee that the signal of acceleration probe output is unlikely to difference on amplitude and aspect the undesired signal, can reach the effect of " plug and play " basically.In order to reach optimum efficiency, can be at the scene through correction and the adjustment that toggle switch and viewing lamp carry out parameter be set, attempt convertible probe mounting position.Suggestion is debugged when promptly signal is near maximum under the situation near empty mill.
Claims (9)
1. coal load quantity sensor; It is characterized in that: it comprises: an acceleration sensor module, a signal condition module, an analog-to-digital conversion module, a digital signal processor and a digital-to-analog conversion and signal condition module that sequential signal connects; Also comprise a power module; It is said acceleration sensor module, signal condition module, analog-to-digital conversion module, digital signal processor, digital-to-analog conversion and signal condition module for power supply, and said acceleration transducer is connected on the coal pulverizer bolster.
2. coal load quantity sensor according to claim 1 is characterized in that: said acceleration transducer adopts direct current 24V power supply, and it exports the mV magnitude voltage signals, and this voltage signal is transferred to said signal condition module.
3. coal load quantity sensor according to claim 2 is characterized in that: after said signal condition module is received said voltage signal, carry out signal filtering, carry out voltage signal then and amplify, and the voltage signal after will amplifying transfers to said analog-to-digital conversion module.
4. coal load quantity sensor according to claim 3; It is characterized in that: said analog-to-digital conversion module adopts the voltage signal after 16 high-precision AD chips amplify signal to gather; And convert this voltage signal to digital signal, again with this digital data transmission to said digital signal processor.
5. coal load quantity sensor according to claim 4; It is characterized in that: the digital signal of said digital signal processor after to analog to digital conversion done FFT; And the power in the selected frequency band carried out integration, and average after repeatedly handling, obtain the mean value of coal load quantity data-signal.
6. coal load quantity sensor according to claim 5; It is characterized in that: said digital-to-analog conversion and signal condition convert digital signal processor to voltage signal with the coal load quantity data-signal of gained through the DA chip, change current circuit output 4-20mA current signal through a voltage again.
7. according to the arbitrary described coal load quantity sensor of claim 1 to 6, it is characterized in that: said acceleration transducer is connected with a viewing lamp circuit with a toggle switch, to realize that acceleration transducer is carried out parameter correction and adjustment.
8. coal load quantity detection method is characterized in that it may further comprise the steps:
Survey coal pulverizer bearing vibration acceleration, and output mV magnitude voltage signals;
Said voltage signal is carried out signal filtering, carry out voltage signal then and amplify;
Voltage signal to after the signal amplification is gathered, and converts this voltage signal to digital signal;
Said digital signal is done FFT, and the power in the selected frequency band is carried out integration, average after repeatedly handling, obtain the mean value of coal load quantity data-signal;
Convert the coal load quantity data-signal of gained to voltage signal, change the current signal of current circuit output through a voltage again as the coal load quantity signal.
9. coal load quantity detection method according to claim 8 is characterized in that, the scope of said current signal as the coal load quantity signal is 4-20mA.
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| CN201110341238.7A CN102506936B (en) | 2011-11-02 | 2011-11-02 | Coal load sensor |
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| CN201110341238.7A CN102506936B (en) | 2011-11-02 | 2011-11-02 | Coal load sensor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308989A (en) * | 2000-02-12 | 2001-08-22 | 长春锅炉仪表总厂 | Load monitoring sensor for steel ball coal grinder in steam-electric power plant |
| CN201279480Y (en) * | 2008-09-09 | 2009-07-29 | 王昕� | Steel-ball milling state detection system |
| WO2009152810A1 (en) * | 2008-06-20 | 2009-12-23 | Schaeffler Kg | Monitoring system for an assembly that is subject to vibrations |
| CN201575861U (en) * | 2009-02-18 | 2010-09-08 | 长沙全程数字机电科技有限公司 | Integral vibration monitor |
| CN202304883U (en) * | 2011-11-02 | 2012-07-04 | 广东亚仿科技股份有限公司 | Coal load sensor |
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- 2011-11-02 CN CN201110341238.7A patent/CN102506936B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308989A (en) * | 2000-02-12 | 2001-08-22 | 长春锅炉仪表总厂 | Load monitoring sensor for steel ball coal grinder in steam-electric power plant |
| WO2009152810A1 (en) * | 2008-06-20 | 2009-12-23 | Schaeffler Kg | Monitoring system for an assembly that is subject to vibrations |
| CN201279480Y (en) * | 2008-09-09 | 2009-07-29 | 王昕� | Steel-ball milling state detection system |
| CN201575861U (en) * | 2009-02-18 | 2010-09-08 | 长沙全程数字机电科技有限公司 | Integral vibration monitor |
| CN202304883U (en) * | 2011-11-02 | 2012-07-04 | 广东亚仿科技股份有限公司 | Coal load sensor |
Non-Patent Citations (2)
| Title |
|---|
| 徐晶 等: "基于FFT算法的振动信号分析", 《工业控制计算机》, vol. 18, no. 12, 25 December 2005 (2005-12-25) * |
| 苏杰 等: "球磨机内存煤量在线监测的实验研究", 《华北电力》, no. 8, 24 August 1999 (1999-08-24) * |
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