CN210596908U - Hot aggregate temperature control device of bituminous mixture stirring station - Google Patents
Hot aggregate temperature control device of bituminous mixture stirring station Download PDFInfo
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- CN210596908U CN210596908U CN201921143266.6U CN201921143266U CN210596908U CN 210596908 U CN210596908 U CN 210596908U CN 201921143266 U CN201921143266 U CN 201921143266U CN 210596908 U CN210596908 U CN 210596908U
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Abstract
The utility model belongs to production process control field, concretely relates to hot aggregate temperature control device at bituminous mixture stirring station. The hot aggregate temperature control device consists of a combustion chamber temperature auxiliary control loop, a large hysteresis compensation control branch, a flow compensation control branch, a cold aggregate conveying branch and a hot aggregate temperature main control loop. The flow compensation control branch compensates the influence of the cold aggregate flow change on the hot aggregate temperature; the large hysteresis compensation control branch overcomes the influence of the large hysteresis characteristic of the drying roller on the temperature of the hot aggregate; the combustion chamber temperature auxiliary control loop accelerates the heating response speed of the combustor and reduces the influence on the temperature of hot aggregate; the hot aggregate temperature main control loop further improves the precision of the control of the hot aggregate temperature. The utility model discloses use big lag control, compensation control and cascade control to improve the stability of hot aggregate temperature.
Description
Technical Field
The utility model belongs to production process control field, in particular to hot aggregate temperature control device at bituminous mixture stirring station.
Background
The temperature control of hot aggregate in an asphalt mixing plant is one of the key factors for producing high-quality asphalt mixture, and the control requirement of the whole asphalt mixing process on the temperature of the hot aggregate is very strict.
In the process of stirring the asphalt mixture, the temperature of the hot aggregate affects the quality of the asphalt mixture: the temperature of the hot aggregate is too low, and the temperature of the final asphalt mixture is also reduced, so that the paving and rolling quality is affected, and the conditions of uneven stirring and difficult rolling are caused; when the temperature of the hot aggregate is too high, the asphalt mixture can be overheated and aged, the binding power is reduced, and the segregation phenomenon after paving is serious.
According to a single-loop hot aggregate temperature control device of a traditional asphalt mixture mixing station, the large hysteresis characteristic of a drying roller is not considered, so that the system is subjected to overshoot or oscillation; the influence of the cold aggregate feeding amount on the temperature stability of the hot aggregate is not considered, so that the temperature of the hot aggregate fluctuates; the slow response speed of the burner heating is not considered, so that the heating efficiency of the burner is low.
SUMMERY OF THE UTILITY MODEL
The utility model provides a hot aggregate temperature control device of bituminous mixture stirring station to the problem that exists among the prior art for the hot aggregate temperature control of bituminous mixture stirring station is in 180 degrees centigrade +/-3 ℃ within range.
The utility model adopts the technical proposal that:
a hot aggregate temperature control device of an asphalt mixture mixing station is composed of a combustion chamber temperature auxiliary control loop, a large hysteresis compensation control branch, a flow compensation control branch, a cold aggregate conveying branch and a hot aggregate temperature main control loop;
the combustion chamber temperature auxiliary control loop is a loop formed by sequentially connecting an auxiliary controller, a D/A converter, a frequency converter, an oil pump, a combustion chamber temperature detection sensor, an A/D converter 1 and a comparator 1; the large lag compensation control branch is composed of a large lag compensation controller and a comparator 4; the flow compensation control branch consists of a cold aggregate flow detection sensor, an A/D converter 3 and a flow compensation controller; the main control loop of the hot aggregate temperature mainly comprises a main controller, a hot air pipe, a drying roller, a hot aggregate temperature detection sensor, an A/D converter 2 and a comparator 2 which are connected in sequence; the cold aggregate conveying branch consists of a conveying belt and a comparator 3;
the thermal aggregate temperature detection sensor is used for measuring the temperature of the thermal aggregate, and the output end of the thermal aggregate temperature detection sensor is connected with the input end of the A/D converter 2;
the combustion chamber temperature detection sensor is used for measuring the temperature of the combustion chamber, the output end of the combustion chamber temperature detection sensor is connected with the input end of the A/D converter 1, and the output end of the A/D converter 1 is connected with the input end of the comparator 1 and the input end of the large hysteresis compensation controller;
the cold aggregate flow detection sensor is used for measuring the flow of cold aggregates, the output end of the cold aggregate flow detection sensor is connected with the input end of the A/D converter 3, and the output end of the A/D converter 3 is connected with the input end of the flow compensation controller;
the comparator 4 is respectively connected with the A/D converter 2, the large hysteresis compensation controller and the comparator 2; the comparator 4 adds the measured value of the temperature of the hot aggregate output by the A/D converter 2 with the large hysteresis compensation value output by the large hysteresis compensation controller to obtain a main feedback signal; the main feedback signal is input to the input of the comparator 2; the output of the comparator 2 is connected with the input end of the main controller, and the comparator 2 subtracts the set value of the temperature of the hot aggregate from the main feedback signal to obtain a main deviation value; the main deviation value is input to the input end of the main controller, and the main control quantity output by the main controller is input to the input end of the comparator 1; the output of the comparator 1 is connected with the input end of the flow compensation controller, the comparator 1 adds the main control quantity output by the main controller and the flow compensation value output by the flow compensation controller, and then subtracts the combustion chamber temperature measured value output by the A/D converter 1 to obtain an offset value;
the auxiliary deviation value is input to the input end of an auxiliary controller, the auxiliary control quantity output by the auxiliary controller is input to the input end of a D/A converter, the output quantity of the D/A converter is transmitted to the input end of a frequency converter, the output of the frequency converter is transmitted to the input end of an oil pump, the rotating speed of the oil pump is controlled to change the oil inlet quantity entering a combustion chamber, and fuel oil enters the combustion chamber to be combusted; the hot-blast input of pipe is carried to the hot-blast air that the combustion chamber produced, and hot-blast pipe connection comparator 3, comparator 3 reconnection drying drum's input, and the output of hot-blast pipe mixes with the cold aggregate that the conveyer belt sent into to mix the heating in drying drum, the hot aggregate that reaches the settlement temperature is exported to drying drum at last.
The flow compensation control branch compensates the influence of the cold aggregate flow change on the hot aggregate temperature; the large hysteresis compensation control branch overcomes the influence of the large hysteresis characteristic of the drying roller on the temperature of the hot aggregate; the combustion chamber temperature auxiliary control loop accelerates the heating response speed of the combustor and reduces the influence on the temperature of hot aggregate; the hot aggregate temperature main control loop further improves the precision of the control of the hot aggregate temperature.
The utility model has the advantages that: the large-lag compensation control branch is used for compensating pure lag in a main loop control object, and control overshoot or oscillation caused by pure lag characteristics is reduced; the flow compensation control branch is used for eliminating the influence of cold aggregate quantity disturbance; and cascade control is used, the oil output quantity of the oil pump is controlled through quick response of the auxiliary control loop, and the stability of the temperature of the hot aggregate is improved.
Drawings
FIG. 1 is a block diagram of a hot aggregate temperature control device of an asphalt mixing plant.
Detailed Description
The following describes the present invention with reference to fig. 1.
The use process of the hot aggregate temperature control device of the asphalt mixture mixing station comprises the following steps:
(1) setting a temperature set value of the hot aggregate;
(2) detecting the feeding amount of cold aggregate by a cold aggregate flow detection sensor, converting the detected analog quantity through an A/D converter 3 to obtain a corresponding digital quantity, inputting the digital quantity into a flow compensation controller, calculating a flow compensation value, and outputting the flow compensation value to a comparator 1;
(3) the temperature of the hot aggregate at the outlet of the drying roller is detected by a hot aggregate temperature detection sensor, the detected analog quantity is converted by an A/D converter 2 to obtain a corresponding digital quantity, and the digital quantity is input into a comparator 2;
(4) detecting the temperature of the combustion chamber by a combustion chamber temperature detection sensor, converting the detected analog quantity by an A/D converter 1 to obtain a corresponding digital quantity, and inputting the digital quantity into a comparator 1;
(5) the main control quantity output by the main controller is output to the input end of the large hysteresis compensation controller, and a large hysteresis compensation value output by the large hysteresis compensation controller is calculated;
(6) the comparator 2 subtracts the temperature set value of the thermal aggregate from the large hysteresis compensation value output by the large hysteresis compensation controller, and then subtracts the temperature measured value of the thermal aggregate output by the A/D converter 2 to obtain the input value of the main controller;
(7) calculating a main control quantity output by the main controller, adding the main control quantity output by the main controller and a large hysteresis compensation value output by the large hysteresis compensation controller by the comparator 1, and subtracting a combustion chamber temperature measured value output by the A/D converter 1 to obtain an input value of the auxiliary controller;
(8) calculating the auxiliary control quantity output by the auxiliary controller, outputting the auxiliary control quantity output by the auxiliary controller to the input end of a D/A converter, outputting the output analog quantity of the D/A converter to the input end of a frequency converter, controlling the rotating speed of an oil pump by the output of the frequency converter so as to change the oil inlet quantity entering a combustion chamber, obtaining an oil pump frequency converter instruction output by the auxiliary controller, and further controlling the oil inlet quantity of the combustion chamber by controlling the oil pump frequency converter;
(9) the hot air generated by the combustion chamber is sent to the drying roller through the hot air pipe to heat the cold aggregate sent by the conveyor belt, and the drying roller finally outputs the hot aggregate reaching the set temperature.
What has been described above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and scope of the present invention are to be considered as included within the scope of the present invention.
Claims (1)
1. A hot aggregate temperature control device of an asphalt mixture mixing station is characterized in that the hot aggregate temperature control device consists of a combustion chamber temperature auxiliary control loop, a large hysteresis compensation control branch, a flow compensation control branch, a cold aggregate conveying branch and a hot aggregate temperature main control loop;
the combustion chamber temperature auxiliary control loop is a loop formed by sequentially connecting an auxiliary controller, a D/A converter, a frequency converter, an oil pump, a combustion chamber temperature detection sensor, an A/D converter 1 and a comparator 1; the large lag compensation control branch is composed of a large lag compensation controller and a comparator 4; the flow compensation control branch consists of a cold aggregate flow detection sensor, an A/D converter 3 and a flow compensation controller; the main control loop of the hot aggregate temperature mainly comprises a main controller, a hot air pipe, a drying roller, a hot aggregate temperature detection sensor, an A/D converter 2 and a comparator 2 which are connected in sequence; the cold aggregate conveying branch consists of a conveying belt and a comparator 3;
the thermal aggregate temperature detection sensor is used for measuring the temperature of the thermal aggregate, and the output end of the thermal aggregate temperature detection sensor is connected with the input end of the A/D converter 2;
the combustion chamber temperature detection sensor is used for measuring the temperature of the combustion chamber, the output end of the combustion chamber temperature detection sensor is connected with the input end of the A/D converter 1, and the output end of the A/D converter 1 is connected with the input end of the comparator 1 and the input end of the large hysteresis compensation controller;
the cold aggregate flow detection sensor is used for measuring the flow of cold aggregates, the output end of the cold aggregate flow detection sensor is connected with the input end of the A/D converter 3, and the output end of the A/D converter 3 is connected with the input end of the flow compensation controller;
the comparator 4 is respectively connected with the A/D converter 2, the large hysteresis compensation controller and the comparator 2; the comparator 4 adds the measured value of the temperature of the hot aggregate output by the A/D converter 2 with the large hysteresis compensation value output by the large hysteresis compensation controller to obtain a main feedback signal; the main feedback signal is input to the input of the comparator 2; the output of the comparator 2 is connected with the input end of the main controller, and the comparator 2 subtracts the set value of the temperature of the hot aggregate from the main feedback signal to obtain a main deviation value; the main deviation value is input to the input end of the main controller, and the main control quantity output by the main controller is input to the input end of the comparator 1; the output of the comparator 1 is connected with the input end of the flow compensation controller, the comparator 1 adds the main control quantity output by the main controller and the flow compensation value output by the flow compensation controller, and then subtracts the combustion chamber temperature measured value output by the A/D converter 1 to obtain an offset value;
the auxiliary deviation value is input to the input end of an auxiliary controller, the auxiliary control quantity output by the auxiliary controller is input to the input end of a D/A converter, the output quantity of the D/A converter is transmitted to the input end of a frequency converter, the output of the frequency converter is transmitted to the input end of an oil pump, the rotating speed of the oil pump is controlled to change the oil inlet quantity entering a combustion chamber, and fuel oil enters the combustion chamber to be combusted; the hot-blast input of pipe is carried to the hot-blast air that the combustion chamber produced, and hot-blast pipe connection comparator 3, comparator 3 reconnection drying drum's input, and the output of hot-blast pipe mixes with the cold aggregate that the conveyer belt sent into to mix the heating in drying drum, the hot aggregate that reaches the settlement temperature is exported to drying drum at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921143266.6U CN210596908U (en) | 2019-07-20 | 2019-07-20 | Hot aggregate temperature control device of bituminous mixture stirring station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921143266.6U CN210596908U (en) | 2019-07-20 | 2019-07-20 | Hot aggregate temperature control device of bituminous mixture stirring station |
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| CN210596908U true CN210596908U (en) | 2020-05-22 |
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| CN201921143266.6U Expired - Fee Related CN210596908U (en) | 2019-07-20 | 2019-07-20 | Hot aggregate temperature control device of bituminous mixture stirring station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258251A (en) * | 2019-07-20 | 2019-09-20 | 江南大学 | A kind of hot aggregate temperature control device and method of asphalt mixing plant |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258251A (en) * | 2019-07-20 | 2019-09-20 | 江南大学 | A kind of hot aggregate temperature control device and method of asphalt mixing plant |
| CN110258251B (en) * | 2019-07-20 | 2024-04-05 | 江南大学 | Hot aggregate temperature control device and method for asphalt mixture stirring station |
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Granted publication date: 20200522 Termination date: 20210720 |