CN207991999U - High precision two line system industrial dust detection device - Google Patents
High precision two line system industrial dust detection device Download PDFInfo
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- CN207991999U CN207991999U CN201720818075.XU CN201720818075U CN207991999U CN 207991999 U CN207991999 U CN 207991999U CN 201720818075 U CN201720818075 U CN 201720818075U CN 207991999 U CN207991999 U CN 207991999U
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Abstract
The utility model discloses a kind of high precision two line system industrial dust detection devices, including：Analog signal input module, the analog signal transmitted for receiving dust sensor；AD conversion module, for the analog signal to be converted to digital signal；Digital signal processing module, for carrying out calculation process to the digital signal；D/A conversion module, for will treated that digital signal is converted to analog signal and is output to rear end peripheral hardware；Power supply module, for powering to analog signal input module, AD conversion module, digital signal processing module and D/A conversion module；The analog signal input module, AD conversion module, digital signal processing module and D/A conversion module are sequentially connected.The utility model is controlled using two-wire system, is realized communication and function of supplying power, is reduced the power consumption of equipment；It is handled using mixed signal, improves the accuracy and sensitivity of equipment, by the embedded program commissioning device of digital signal processing module, effectively increase the accuracy of Dust data measuring on Coal Faces.
Description
Technical field
The utility model is related to field of environment protection equipment, more particularly to a kind of high precision two line system industrial dust detection device.
Background technology
Currently, instrument used in industrial dust detection is generally divided into two-wire system and four-wire system, two-wire system by the mode of connection
Instrument is simple, low in energy consumption using cable economy, wiring relative to four-wire system instrument, but load capacity is poor.No matter which kind of controlling party
Formula, sensitivity is to determine the key factor of dust detector device working efficiency, if sensitivity is relatively low, can not ensure that dust is examined
The accuracy and reliability of measured data, to which the truth of dust concentration can not be objectively responded.
The principal element for influencing dust detector device sensitivity has following two points：
One, adjustment accuracy is poor：Current dust detector device is by potentiometer manual adjustment, and there are all for manual adjustment
More uncertain factors can not ensure that every instrument reaches perfect condition, thus stability, consistency are poor, finally influence number
According to accuracy.
Two, Analog control drawback is more：Current two-wire system dust detector device is analog quantity equipment, i.e., is transported by OP
Amplifier is calculated to realize that process control, response signal are restricted, measurement range is limited, and anti-interference ability is weak；Even if in four lines
Digital Signal Processing is used in control equipment, used AD conversion chip precision highest is only to 12.
Utility model content
In order to solve the above technical problems, the utility model discloses a kind of high precision two line system industrial dust detection device,
Including：
Analog signal input module, the analog signal transmitted for receiving dust sensor；
AD conversion module, for the analog signal to be converted to digital signal；
Digital signal processing module, for carrying out calculation process to the digital signal；
D/A conversion module, for will treated that digital signal is converted to analog signal and is output to rear end peripheral hardware；
Power supply module, for analog signal input module, AD conversion module, digital signal processing module and D/A conversion module
Power supply；
The analog signal input module, AD conversion module, digital signal processing module and D/A conversion module are sequentially connected.
As a further improvement of the above technical scheme, the analog signal input module includes that acquisition keeps amplification electricity
Road, the acquisition holding amplifying circuit include：Input terminal buffer amplifier, output port buffer amplifier, the first holding capacitor,
Two holding capacitors, sampling resistor, feedback resistance, the first balance resistance, the second balance resistance, the first analog switch and the second mould
Quasi- switch；
The sampling resistor and the first analog switch are connected on the negative input end of input buffer amplifier；
First balance resistance and the first holding capacitor are connected in parallel on the positive input terminal and output end of input buffer amplifier；
Second balance resistance both ends are separately connected the positive input terminal and simulation ground terminal of input buffer amplifier；
The feedback resistance both ends are separately connected the output end of the first analog switch and output buffer amplifier；
Second holding capacitor both ends are separately connected the negative input end and output end of output buffer amplifier；
Second analog switch both ends are separately connected the output end and output buffer amplifier of input buffer amplifier
Negative input end.
As a further improvement of the above technical scheme, the analog signal input module further includes current rectifying and wave filtering circuit,
The current rectifying and wave filtering circuit includes：Rectifier transformer, rectifier bridge, filter capacitor and load resistance；
The rectifier transformer both ends are separately connected the first input end and the second input terminal of rectifier bridge；
The filter capacitor and load resistance are connected in parallel on the cathode output end and cathode output end of rectifier bridge.
As a further improvement of the above technical scheme, the AD conversion module is 24 sigma-delta type ADC analog-to-digital conversion cores
Piece.
As a further improvement of the above technical scheme, the digital signal processing module is using ARM Cortex M3 kernels
Processor.
The utility model has the beneficial effects that：
1, it is controlled using two-wire system, supply lines and signal wire are combined into one, both threads by one end input, other end output
Realize communication and function of supplying power, the lower power consumption of equipment；
2, using 24 sigma-delta type ADC modulus conversion chips and digital signal processing module, traditional Analog control is converted
It is handled for analog- and digital- mixed signal, substantially increases the accuracy and sensitivity of equipment, Dust data measuring on Coal Faces is more accurate；
3, by the embedded program of digital signal processing module, debugging and calibrator (-ter) unit, precision and consistency are far above manually automatically
Debugging, to further improve the accuracy of Dust data measuring on Coal Faces.
Description of the drawings
In order to illustrate more clearly of the technical scheme in the embodiment of the utility model, will make below to required in embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the utility model,
For those of ordinary skill in the art, without having to pay creative labor, it can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the principles of the present invention schematic diagram；
Fig. 2 is that the acquisition of analog signal input module keeps amplifying circuit principle schematic；
Fig. 3 is the current rectifying and wave filtering circuit principle schematic of analog signal input module.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.
As shown in Figure 1, the high precision two line system industrial dust detection device of the present embodiment, including：Analog signal inputs mould
Block 1, the analog signal transmitted for receiving dust sensor 6；AD conversion module 2, for the analog signal to be converted to number
Word signal；Digital signal processing module 3, for carrying out calculation process to the digital signal；D/A conversion module 4, for after handling
Digital signal be converted to analog signal and be output to rear end peripheral hardware 7；Power supply module 5, for analog signal input module 1,
AD conversion module 2, digital signal processing module 3 and D/A conversion module 4 are powered；Analog signal input module 1, AD conversion module 2, number
Word processing module 3 and D/A conversion module 4 are sequentially connected.
The utility model is controlled using two-wire system, and analog signal inputs, from analog signal input module 1 from D/A conversion module
4 outputs, supply lines and signal wire are combined into one, and both threads realize communication and function of supplying power, reduce the power consumption of equipment.
AD conversion module 2 is 24 sigma-delta type ADC modulus conversion chips, has high-precision, low-power consumption, anti-interference ability
The analog signal that dust sensor 6 transmits accurately can be converted into digital signal by strong advantage, reduced signal as far as possible and lost
Very；Existing four-wire system equipment can only accomplish the A/D conversion accuracy of highest 12 at present, and effect is far away from the utility model
24 ADC modulus conversion chips.
Digital signal processing module 3 is using the processor of ARM Cortex M3 kernels, such as the production of ADI (Ya De promise) company
Super low-power consumption series processors.The processor uses ARM Cortex M3 kernels, configurable a variety of by Direct Programming control
Low power mode of operation.
Due to digital signal processing module 3 using program control, realize substantially exempt from debugging, it is non-maintaining, precision, consistency,
Stability is far above manual debugging, effectively increases the accuracy of Dust data measuring on Coal Faces.
Amplifying circuit, the acquisition is kept to keep amplifying circuit as shown in Fig. 2, analog signal input module 1 includes acquisition
Including：Input terminal buffer amplifier A1, output port buffer amplifier A2, the first holding capacitor C1, the second holding capacitor C2, sampling
Resistance R1, feedback resistance R2, the first balance resistance R3, the second balance resistance R4, the simulations of the first analog switch K1 and second are opened
Close K2.
Sampling resistor R1 and the first analog switch K1 is connected on the negative input end of input buffer amplifier A1；First balance electricity
Resistance R3 and the first holding capacitor C1 is connected in parallel on the positive input terminal and output end of input buffer amplifier A1；Second balance resistance R4 two
End is separately connected the positive input terminal and simulation ground terminal of input buffer amplifier A1；The both ends feedback resistance R2 are separately connected the first simulation
The output end of switch K1 and output buffer amplifier A2；Second both ends holding capacitor C2 are separately connected output buffer amplifier A2's
Negative input end and output end；Second both ends analog switch K2 are separately connected the output end of input buffer amplifier A1 and output buffers
The negative input end of amplifier A2.
Acquisition of the analog electrical signal that dust sensor 6 transmits through analog signal input module 1 keeps amplifying circuit processing
Afterwards, the level value that can track or keep analog electrical signal, to ensure subsequent AD conversion precision.
Input buffer amplifier A1 and output buffer amplifier A2 can be such that the first holding capacitor C1 and second keeps respectively
Charge and discharge are rapidly completed in capacitance C2, reduce the distortion of analog electrical signal to the greatest extent.
The effect of sampling resistor R1 is that analog current signal is converted to analog voltage signal, for subsequent sampling and is surveyed
Amount.
Feedback resistance R2 can avoid the limitation of fixed gain bandwidth, and the resistance value by reducing feedback resistance R2 can
To keep circuit high-gain while improving gain.
First balance resistance R3 is used for balancing the offset current of input buffer amplifier A1 positive input terminals and output end so that
The balance of voltage of two terminals.
Second balance resistance R4 is used for balancing the size of input buffer amplifier A1 positive input terminal input currents, prevents electric current
Excessive damage equipment.
As shown in figure 3, analog signal input module 1 further includes current rectifying and wave filtering circuit, the current rectifying and wave filtering circuit includes：It is whole
Convertor transformer U, rectifier bridge V, filter capacitor C and load resistance R.The both ends rectifier transformer U are separately connected the first of rectifier bridge V
Input terminal V1 and the second input terminal V2；Filter capacitor C and load resistance R is connected in parallel on the cathode output end V3 and cathode of rectifier bridge V
Output end V4.
Rectifier bridge V utilizes the one-way conduction principle of diode, alternating current is converted to direct current, and pass through filter capacitor C
Both end voltage cannot be mutated can only the characteristics of charge and discharge carried for subsequent analog-to-digital conversion to obtain smooth pulse voltage signal
For ensureing.
The operation principle of the utility model is as follows：
It is defeated that dust sensor 6 sends the dust concentration information detected to analog signal in the form of analog current signal
Enter module 1, analog current signal is converted to analog voltage signal by analog signal input module 1, and by amplification, rectification, filter
After wave processing, then send analog voltage signal to AD conversion module 2.
Analog voltage signal is converted into digital signal by AD conversion module 2, and sends the digital signal to digital processing
Module 3, after a series of working process such as the detection of digital signal processing module 3, filtering, noise reduction, spectrum analysis, identification, then will
Digital signal sends D/A conversion module 4 to.
D/A conversion module 4 converts digital signals into analog signal, and sends rear end peripheral hardware 7 to and carry out corresponding operating.Example
Such as, control instruction can be converted digital signals into, control rear end PLC is operated accordingly；Digital signal can also be turned
Corresponding dust concentration data are changed to, are presented on the display of rear end, important parameter is provided for staff.
The utility model combines Digital Signal Processing and analog signal processing, is a kind of mixed signal tupe,
Still belong to the first time application in industrial dust detection field, and not only conversion speed is fast, precision is high, and power consumption and at low cost, carries
While dusty accuracy of detection, cost is saved for enterprise.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection domain within.
Claims (4)
1. a kind of high precision two line system industrial dust detection device, which is characterized in that including：
Analog signal input module, the analog signal transmitted for receiving dust sensor；
AD conversion module, for the analog signal to be converted to digital signal；
Digital signal processing module, for carrying out calculation process to the digital signal；
D/A conversion module, for will treated that digital signal is converted to analog signal and is output to rear end peripheral hardware；
Power supply module, for being supplied to analog signal input module, AD conversion module, digital signal processing module and D/A conversion module
Electricity；
The analog signal input module, AD conversion module, digital signal processing module and D/A conversion module are sequentially connected；
The analog signal input module includes acquisition holding amplifying circuit, and the acquisition holding amplifying circuit includes：Input terminal
Buffer amplifier, output port buffer amplifier, the first holding capacitor, the second holding capacitor, sampling resistor, feedback resistance, first
Balance resistance, the second balance resistance, the first analog switch and the second analog switch；
The sampling resistor and the first analog switch are connected on the negative input end of input buffer amplifier；
First balance resistance and the first holding capacitor are connected in parallel on the positive input terminal and output end of input buffer amplifier；
Second balance resistance both ends are separately connected the positive input terminal and simulation ground terminal of input buffer amplifier；
The feedback resistance both ends are separately connected the output end of the first analog switch and output buffer amplifier；
Second holding capacitor both ends are separately connected the negative input end and output end of output buffer amplifier；
Second analog switch both ends be separately connected input buffer amplifier output end and output buffer amplifier it is negative defeated
Enter end.
2. high precision two line system industrial dust detection device according to claim 1, which is characterized in that the analog signal
Input module further includes current rectifying and wave filtering circuit, and the current rectifying and wave filtering circuit includes：Rectifier transformer, rectifier bridge, filter capacitor with
And load resistance；
The rectifier transformer both ends are separately connected the first input end and the second input terminal of rectifier bridge；
The filter capacitor and load resistance are connected in parallel on the cathode output end and cathode output end of rectifier bridge.
3. high precision two line system industrial dust detection device according to claim 1, which is characterized in that the AD conversion mould
Block is 24 sigma-delta type ADC modulus conversion chips.
4. high precision two line system industrial dust detection device according to claim 1, which is characterized in that the digital processing
Module is the processor using ARM Cortex M3 kernels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720818075.XU CN207991999U (en) | 2017-07-07 | 2017-07-07 | High precision two line system industrial dust detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720818075.XU CN207991999U (en) | 2017-07-07 | 2017-07-07 | High precision two line system industrial dust detection device |
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| CN207991999U true CN207991999U (en) | 2018-10-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132167A (en) * | 2017-07-07 | 2017-09-05 | 青岛环瑞自动化科技有限公司 | High precision two line system industrial dust detection means |
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2017
- 2017-07-07 CN CN201720818075.XU patent/CN207991999U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132167A (en) * | 2017-07-07 | 2017-09-05 | 青岛环瑞自动化科技有限公司 | High precision two line system industrial dust detection means |
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