CN201189701Y - Frequency converting controller of drier roll negative-pressure air induction for asphalt-stirring station - Google Patents
Frequency converting controller of drier roll negative-pressure air induction for asphalt-stirring station Download PDFInfo
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- CN201189701Y CN201189701Y CNU2008200052472U CN200820005247U CN201189701Y CN 201189701 Y CN201189701 Y CN 201189701Y CN U2008200052472 U CNU2008200052472 U CN U2008200052472U CN 200820005247 U CN200820005247 U CN 200820005247U CN 201189701 Y CN201189701 Y CN 201189701Y
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Abstract
The utility model discloses a device for the frequency-conversion control to negative-pressure induced air in a drying roller of an asphalt mixing plant, and relates to asphalt mixture stirring equipment. The device adopts a frequency-conversion control technology for controlling the rotational speed of a draught fan so as to realize the stable and reliable control; the device comprises the draught fan, a detection unit for negative pressure in the roller, a negative-pressure transmitter, a comparison unit and a transducer, wherein the detection unit for negative pressure in the roller acquires information of the negative pressure in the drying roller, the negative-pressure transmitter receives the information of the negative pressure and converts the information into an electric signal for detection information; the comparison unit receives the electric signal for the detection information, compares the electric signal with a control preset value and outputs an instruction signal for speed regulation; and the transducer receives the instruction signal for speed regulation and outputs an alternating current signal with corresponding frequency to control the rotational speed of the draught fan. Compared with the prior art, the device can achieve the aims of smooth and stable startup, dynamic following, timely regulation, energy conservation and consumption reduction and avoid the problems that the device controls an air door of the draught fan manually and has low control precision and large energy consumption.
Description
Technical field
The utility model relates to the asphalt mixing apparatus, is specifically related to a kind of bituminous mixing plant drying drum negative pressure induced wind frequency-converting control device.
Background technology
Bituminous mixing plant has obtained using widely in highway construction project, and wherein drying drum is the important component part of bituminous mixing plant.In the work,, require the interior negative pressure of drying drum on certain certain value, to keep substantially constant for guaranteeing the dust removing effects of hot aggregate; If negative pressure is too low, the dust removing effects of hot aggregate is poor, if negative pressure is too high, has increased the burden of dust pelletizing system on the one hand, increases energy consumption, on the other hand, influences the fines grating of hot aggregate, and then influences the quality that pitch stirs the finished product material.Therefore, the control of negative pressure value is the important indicator of weighing the complete machine performance in the drying drum.
Negative pressure control is by the running parameter decision of dedusting air-introduced machine and combustor blast machine in the drying drum.In the course of work, on burner wind oil ratio basis of constant, for keeping the substantially constant of hot aggregate temperature, need to adjust the fuel oil aperture of burner, and the air blast aperture of burner is adjusted dynamically thereupon also; At this moment, negative pressure is corresponding in the drying drum changes.Therefore, be negative pressure substantially constant in the cylinder that keeps dry, need correspondingly adjust the air quantity of dedusting air-introduced machine.
In the existing cylinder negative pressure control, the adjustment of air-introduced machine air quantity is manually to be controlled by the operator, after promptly the operator observes cylinder detection of negative pressure value, manually controls the air-introduced machine air door.Need to increase the cylinder negative pressure, then increase the air-introduced machine air door; Otherwise then reduce the air-introduced machine air door, to keep cylinder negative pressure substantially constant.But, adopt manually control air-introduced machine air door, exist the shortcoming that control accuracy is not high, energy consumption is big; In addition,, adopt soft initiator or star triangle start in the existing cylinder negative pressure control, all exist startup and impact big problem because air-introduced machine power is bigger.
The utility model content
At above-mentioned defective, the technical problem that the utility model solves is, a kind of bituminous mixing plant drying drum negative pressure induced wind frequency-converting control device is provided, and adopts the rotating speed of frequency conversion control technique control air-introduced machine, to realize reliable and stable control.
The bituminous mixing plant drying drum negative pressure induced wind frequency-converting control device that the utility model provides comprises:
Air-introduced machine;
Lnp information in the drying drum is gathered in cylinder detection of negative pressure unit;
The negative pressure transmitter receives described lnp information and is converted to the detection information signal of telecommunication;
Comparing unit receives the described detection information signal of telecommunication and compares and export the speed-regulating instruction signal with the control preset value;
Frequency converter receives described speed-regulating instruction signal and exports the ac current signal control air-introduced machine rotating speed of respective frequencies.
Preferably, described comparing unit adopts a programmable logic controller (PLC) to realize.
Preferably, described programmable logic controller (PLC) comprises: the analog quantity input module receives the described detection information signal of telecommunication; Primary module compares signal and preset value; Analog output module is exported described speed-regulating instruction signal according to the control information of primary module.
Described programmable logic controller (PLC) also comprises power module, and the power supply of control negative pressure transmitter is supplied with.
Described programmable logic controller (PLC) also comprises gauge tap amount module, exports the start and stop of switching value signal controlling frequency converter according to the control information of primary module.
Preferably, also comprise relay, relay coil is serially connected between the output of the output of described gauge tap amount module and described power module; Relay contact switch is as the switch of described frequency converter Enable Pin.
Preferably, also comprise host computer, output control preset value is to the primary module of programmable logic controller (PLC).
Adopt the MPI communications protocol between described host computer and the programmable logic controller (PLC).
The device that the utility model provides compared with prior art can reach to start smoothly and stablize, and dynamic following is in time adjusted, energy saving purposes; Avoided adopting manually control air-introduced machine air door, the problem that the control accuracy of existence is not high, energy consumption is big.
The bituminous mixing plant drying drum negative pressure induced wind frequency-converting control device that the utility model provides is specially adapted to the bituminous mixing plant drying drum.
Description of drawings
Fig. 1 is the unit block diagram of bituminous mixing plant drying drum negative pressure induced wind frequency-converting control device described in the utility model;
Fig. 2 is the physical circuit figure of the utility model embodiment 2.
The specific embodiment
Specify present embodiment below in conjunction with Figure of description.
Design philosophy of the present utility model is to adopt the rotating speed of frequency conversion control technique control air-introduced machine, and then negative pressure in the reliable and stable control bituminous mixing plant drying drum.
Embodiment 1:
See also Fig. 1, this figure is the unit block diagram of bituminous mixing plant drying drum negative pressure induced wind frequency-converting control device described in the utility model.
As shown in Figure 1, the utility model comprises air-introduced machine, cylinder detection of negative pressure unit, negative pressure transmitter, comparing unit and frequency converter; Wherein, lnp information in the drying drum is gathered in cylinder detection of negative pressure unit; The negative pressure transmitter receives described lnp information and is converted to the detection information signal of telecommunication; Comparing unit receives the described detection information signal of telecommunication and compares and export the speed-regulating instruction signal with the control preset value; Frequency converter receives described speed-regulating instruction signal and exports the ac current signal control air-introduced machine rotating speed of respective frequencies.
In the course of work, open burner, the startup of combustor blast machine has reduced negative pressure in the cylinder, and the negative pressure transmitter becomes true negative pressure value in the cylinder delivers to comparing unit, comparing unit increases the analog quantity output quantity, then the frequency converter output frequency increases, the blower motor faster rotational speed, and air inducing increases, the cylinder negative pressure will increase thereupon, when reaching cylinder negative pressure setting value, the frequency converter output frequency no longer increases, and it is constant to keep output frequency.
Compared with prior art, the utility model can reach and start level and smooth stablizing, and dynamic following is in time adjusted, energy saving purposes; Avoided adopting manually control air-introduced machine air door, the problem that the control accuracy of existence is not high, energy consumption is big.
Embodiment 2:
As preferred plan of the present utility model, the difference of present embodiment and embodiment 1 is that described comparing unit selects for use programmable logic controller (PLC) to realize.
Elaborate below in conjunction with Fig. 2, this figure is the physical circuit figure of the utility model embodiment 2.
As shown in Figure 2, described programmable logic controller (PLC) PLC comprises: power module PS307, analog quantity input module SM331, primary module CPU313C, gauge tap amount module SM322 and analog output module SM332.Wherein, the power supply of described power module control negative pressure transmitter is supplied with; Described analog quantity input module is used to receive the described detection information signal of telecommunication; Described primary module is used for this detection information signal of telecommunication and preset value are compared; Described gauge tap amount module is according to the start and stop of the control information output switching value signal controlling frequency converter of primary module; Described analog output module is according to the control information output analog signals control rotation speed of fan of primary module.
Cylinder detection of negative pressure unit detects in the cylinder after the negative pressure, with this information conveyance to the negative pressure transmitter; At this moment, direct current signal of the Line 1 of negative pressure transmitter output is delivered to PLC analog quantity input module SM331, be, the signal of telecommunication output detection information that the negative pressure transmitter can other form, such as: voltage signal; with being appreciated that Whether this negative pressure value of PLC primary module CPU313C analysis and judgement is different with preset value, if different, then controls the work of analog output module SM332; The output frequency of output analog signals control frequency converter is realized the purpose of control air-introduced machine rotating speed, and then is controlled the size of air inducing, regulates negative pressure in the cylinder negative pressure cylinder of pitch station.
Concrete control procedure is: the power module PS307 of PLC supplies with negative pressure transmitter 24V dc source, and described cylinder detection of negative pressure unit is used to gather negative pressure value (scope 0.0～100.0mmH in the drying drum
2O), and with this negative pressure value export the negative pressure transmitter to; Outputting standard current signal (scope 0～20mA is sent in described negative pressure transmitter change; Wherein, 0.0mmH
2O is corresponding to 0mA standard direct current signal, 100.0mmH
2O is corresponding to 20mA standard direct current signal, and linear the change sent) to programmable logic controller (PLC), the true negative pressure value in the treated data represented cylinder; Programmable logic controller (PLC) compares this true negative pressure value and the negative pressure value of presetting, and linear on the original basis increasing or minimizing analog quantity output control data; This analog quantity output control data is set a maximum, and this maximum is corresponding to the required control data of analog output module output 20mA DC current; This analog quantity output control data is controlled DC current analog signals (scope 0～20MA of described analog output module output; Wherein control data 0 is corresponding to the 0MA average anode current, the control data maximum is corresponding to the 20MA average anode current, be linear corresponding relation) with control fan type frequency converter, frequency converter output respective frequencies alternating current (export corresponding to frequency converter 0Hz by 0MA DC current analog signals, 20MA DC current analog signals is linear corresponding relation corresponding to frequency converter peak frequency output) drive air-introduced machine and turn round.
Further, bituminous mixing plant drying drum negative pressure induced wind frequency-converting control device described in the utility model also comprises host computer, adopt the MPI communications protocol between described host computer and the programmable logic controller (PLC), output control preset value is realized information interaction between host computer and the programmable logic controller (PLC) to the primary module of programmable logic controller (PLC).Because the MPI communications protocol is the multipoint interface communication, its communication port is integrated on the host computer, can connect and control programmable logic controller (PLC) and other peripheral hardwares (as burner) simultaneously.
In addition, present embodiment also comprises relay, and relay coil is serially connected between the output of the output of described gauge tap amount module and described power module; Relay contact switch is as the switch of described frequency converter Enable Pin.Described relay adopts auxiliary reclay; When starting frequency converter, the gauge tap amount module of PCL output switching value signal, coil electricity utilizes electromagnetic force that moving iron is pulled down, and top normally-closed contact is separated, below the normally opened contact closure; Otherwise in like manner, so control frequency converter start and stop.In addition, described auxiliary reclay also plays the effect of insulation blocking PLC.
Particularly, when host computer sends the order of startup blower motor, CPU313C control SM322 output, auxiliary reclay 1KM gets electric, and frequency converter start-up control terminal gets electric, and the control frequency converter starts.Output frequency is by the dc current signal decision of analog quantity control terminal AIN1+ and AIN1-input, CPU313C is according to the analog quantity processing costs of analog quantity input module SM331 and the comparative result of host computer setting value, the increase and the minimizing of control analog output module control word, by the increase and decrease of output module control word, the DC simulation of controlling a 0-20MA of output module SM332 output controls signal on frequency converter analog quantity control terminal AIN1+ and the AIN1-.What of frequency converter output frequency are this analog quantity determine; The blower motor change in rotational speed is controlled in the variation of frequency converter output frequency, thereby causes the variation of negative pressure in the cylinder.
In sum, when work, on host computer, provide and start the air-introduced machine signal, PLC exports the action of control auxiliary reclay with switching value on the one hand, with the start and stop of auxiliary reclay control frequency converter, exports with the frequency of analog output module output DC current control frequency converter on the one hand, driving blower motor smoothly starts, during to setting cylinder negative pressure, the frequency converter output frequency keeps definite value, guarantees the air inducing constant magnitude.After burner is opened, the startup of combustor blast machine will reduce negative pressure in the cylinder, become through detection of negative pressure and deliver to PLC, and PLC controls analog output module, increase the analog quantity output quantity, then the frequency converter output frequency increases, the blower motor faster rotational speed, and air inducing increases, the cylinder negative pressure will increase thereupon, when reaching cylinder negative pressure setting value, the frequency converter output frequency no longer increases, and it is constant to keep output frequency.Otherwise the cylinder negative pressure is higher, and then PLC reduces simulation control output quantity, and the frequency converter output frequency reduces, and negative pressure also will decrease in the cylinder, keeps when setting the cylinder negative pressure value stable.When ordinary production, for keeping the substantially constant of hot aggregate temperature, burner will dynamically be adjusted the fuel oil aperture of burner on wind oil ratio basis of constant, then the air blast aperture of burner also will be followed dynamic adjustment, the cylinder negative pressure also can correspondingly be made variation, judge through the PLC check and analysis, export corresponding change modeling amount control frequency converter, the frequency converter output frequency is with corresponding change, then the big young pathbreaker of air inducing follows combustor blast machine aperture and dynamically adjusts, and the cylinder negative pressure then can be kept steady relatively.
The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (8)
1, bituminous mixing plant drying drum negative pressure induced wind frequency-converting control device comprises air-introduced machine, it is characterized in that, also comprises:
Lnp information in the drying drum is gathered in cylinder detection of negative pressure unit;
The negative pressure transmitter receives described lnp information and is converted to the detection information signal of telecommunication;
Comparing unit receives the described detection information signal of telecommunication and compares and export the speed-regulating instruction signal with the control preset value;
Frequency converter receives described speed-regulating instruction signal and exports the ac current signal control air-introduced machine rotating speed of respective frequencies.
2, control device according to claim 1 is characterized in that, described comparing unit adopts a programmable logic controller (PLC) to realize.
3, control device according to claim 2 is characterized in that, described programmable logic controller (PLC) comprises: the analog quantity input module receives the described detection information signal of telecommunication; Primary module compares signal and preset value; Analog output module is exported described speed-regulating instruction signal according to the control information of primary module.
4, control device according to claim 3 is characterized in that, described programmable logic controller (PLC) also comprises power module, and the power supply of control negative pressure transmitter is supplied with.
According to claim 3 or 4 described control device, it is characterized in that 5, described programmable logic controller (PLC) also comprises gauge tap amount module, export the start and stop of switching value signal controlling frequency converter according to the control information of primary module.
6, control device according to claim 5 is characterized in that, comprises that also relay, relay coil are serially connected between the output of the output of described gauge tap amount module and described power module; Relay contact switch is as the switch of described frequency converter Enable Pin.
7, control device according to claim 1 is characterized in that, also comprises host computer, and output control preset value is to the primary module of programmable logic controller (PLC).
8, control device according to claim 7 is characterized in that, adopts the MPI communications protocol between described host computer and the programmable logic controller (PLC).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200052472U CN201189701Y (en) | 2008-03-25 | 2008-03-25 | Frequency converting controller of drier roll negative-pressure air induction for asphalt-stirring station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200052472U CN201189701Y (en) | 2008-03-25 | 2008-03-25 | Frequency converting controller of drier roll negative-pressure air induction for asphalt-stirring station |
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| Publication Number | Publication Date |
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| CN201189701Y true CN201189701Y (en) | 2009-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200052472U Expired - Lifetime CN201189701Y (en) | 2008-03-25 | 2008-03-25 | Frequency converting controller of drier roll negative-pressure air induction for asphalt-stirring station |
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| CN (1) | CN201189701Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102680A (en) * | 2010-12-21 | 2011-06-22 | 三一重工股份有限公司 | Control method and device for draught fan damper opening and engineering machinery comprising device |
| CN102494527A (en) * | 2011-11-16 | 2012-06-13 | 中联重科股份有限公司 | Negative pressure control process, negative pressure controller, negative pressure control system for drying drum and mixing equipment |
| CN108797272A (en) * | 2018-05-03 | 2018-11-13 | 南京同力建设集团股份有限公司 | A kind of burner and its control method of twin-roll heat regeneration asphalt concrete mixing machine |
| CN114953189A (en) * | 2022-05-31 | 2022-08-30 | 三一电动车科技有限公司 | Method and device for controlling rotation speed of mixing drum, mixing drum and operation machine |
-
2008
- 2008-03-25 CN CNU2008200052472U patent/CN201189701Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102680A (en) * | 2010-12-21 | 2011-06-22 | 三一重工股份有限公司 | Control method and device for draught fan damper opening and engineering machinery comprising device |
| CN102494527A (en) * | 2011-11-16 | 2012-06-13 | 中联重科股份有限公司 | Negative pressure control process, negative pressure controller, negative pressure control system for drying drum and mixing equipment |
| CN102494527B (en) * | 2011-11-16 | 2013-12-11 | 中联重科股份有限公司 | Negative pressure control process, negative pressure controller, negative pressure control system for drying drum and mixing equipment |
| CN108797272A (en) * | 2018-05-03 | 2018-11-13 | 南京同力建设集团股份有限公司 | A kind of burner and its control method of twin-roll heat regeneration asphalt concrete mixing machine |
| CN114953189A (en) * | 2022-05-31 | 2022-08-30 | 三一电动车科技有限公司 | Method and device for controlling rotation speed of mixing drum, mixing drum and operation machine |
| CN114953189B (en) * | 2022-05-31 | 2023-09-15 | 三一电动车科技有限公司 | Rotation speed control method and device of stirring cylinder, stirring cylinder and operation machine |
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| GR01 | Patent grant | ||
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Granted publication date: 20090204 |