CN112378268A - Heating furnace online furnace temperature control system and control method - Google Patents
Heating furnace online furnace temperature control system and control method Download PDFInfo
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- CN112378268A CN112378268A CN202011270118.8A CN202011270118A CN112378268A CN 112378268 A CN112378268 A CN 112378268A CN 202011270118 A CN202011270118 A CN 202011270118A CN 112378268 A CN112378268 A CN 112378268A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses an online furnace temperature control system of a heating furnace, which comprises a fixed temperature acquisition device, a movable temperature acquisition device, a controller and an adjusting valve arranged on a heating element, wherein the fixed temperature acquisition device is uniformly distributed on the wall of the inner side of a heating furnace body and is used for acquiring the furnace temperature at the corresponding position in a hearth. The movable temperature acquisition device moves together with the workpiece in the heating furnace and is used for acquiring the temperature of the workpiece. The fixed temperature acquisition device and the movable temperature acquisition device are in communication connection with the input end of the controller, and the acquired temperature data are sent to the controller. The output end of the controller is in communication connection with the regulating valve and used for controlling the regulating valve to regulate the heating power of the heating element according to the real-time temperature field. The invention also discloses an online furnace temperature control method of the heating furnace. The temperature in the heating furnace body is corrected in real time, and the precision is high.
Description
Technical Field
The invention relates to the technical field of intelligent control of heating furnaces, in particular to an online furnace temperature control system and a control method for a heating furnace.
Background
The heating furnace is an important device for drying and curing the workpiece, and generally comprises a rapid heating area, a temperature control area and a constant temperature area from an inlet to an outlet in sequence. The furnace temperature curve in the heating furnace is the temperature change curve of the surface of the workpiece under the action of a heating element in the heating furnace when the workpiece passes through the heating furnace on the transmission track. The furnace temperature curve is an important parameter of a process link such as drying, the quality of the surface curing quality of the workpiece is directly influenced, the furnace temperature curve is influenced by the transmission speed of the transmission track and the temperature control of each area, different workpieces are influenced by the size and the material of the workpiece, and the power of a heating element in the heating furnace is required to be adjusted according to the workpieces.
The existing furnace temperature adjusting mode adopts an off-line mode, a furnace temperature detector is arranged on a workpiece and moves along with the workpiece, and a data storage card is arranged in the furnace temperature detector and records the furnace temperature of a heating furnace. And after the workpiece leaves the heating furnace, taking down the furnace temperature detector, drawing a furnace temperature curve by using data in the data storage card everywhere through a computer and other terminals, and adjusting the heating element according to the furnace temperature curve until the furnace temperature curve meets the process requirements. The whole furnace temperature control method is long in time consumption, low in efficiency and too dependent on manual experience, and cannot meet the requirement of efficient production.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide an online furnace temperature control system for a heating furnace, which adopts an online method to monitor the furnace temperature, forms a real-time temperature field by combining a fixed temperature acquisition device and a movable temperature acquisition device and corrects the real-time temperature field in real time. The temperature control to the work piece is more accurate, and the furnace temperature curve debugging to heating furnace equipment is more convenient, and is high-efficient, can also reduce the energy consumption simultaneously.
In order to achieve the above purposes, the invention adopts the technical scheme that: the utility model provides an online furnace temperature control system of heating furnace which characterized in that: the heating furnace comprises a fixed temperature acquisition device, a movable temperature acquisition device, a controller and an adjusting valve arranged on a heating element, wherein the fixed temperature acquisition device is uniformly distributed on the furnace wall on the inner side of a heating furnace body and is used for acquiring the furnace temperature at a corresponding position in a furnace chamber; the movable temperature acquisition device and the workpiece in the heating furnace body move together and are used for acquiring the temperature of the workpiece; the fixed temperature acquisition device and the movable temperature acquisition device are in communication connection with the input end of the controller, and transmit acquired temperature data to the controller, and the controller establishes a real-time temperature field according to the temperature data; and the output end of the controller is in communication connection with the regulating valve and is used for controlling the regulating valve to regulate the heating power of the heating element according to the real-time temperature field.
The invention has the beneficial effects that: the furnace temperature is monitored on line, the controller can obtain the temperature of the position of the fixed temperature acquisition device in real time, a real-time temperature field is obtained by combining the temperature data acquired by the fixed temperature acquisition device, the layout of heating elements in the heating furnace preset according to the process is compared, the heating power of the heating elements is reasonable, and the accurate control of the furnace temperature is realized. The accurate heating of workpieces with different drying requirements is realized, the control precision of the target temperature of the workpieces can be improved, the energy consumption is reduced, and the workpiece heating quality is stable and reliable.
Further, the mobile temperature acquisition device comprises an online furnace temperature tester, and the online furnace temperature tester is wirelessly or wiredly connected with the controller.
Furthermore, the movable temperature acquisition device is fixed on the workpiece or is positioned on one side of the workpiece and fixed on a guide rail for conveying the workpiece, and the temperature acquisition device and the workpiece are synchronously driven.
Further, the mobile temperature acquisition device also comprises a position sensor used for tracking the position of the workpiece in the heating furnace, and the position of the workpiece in the heating furnace body is acquired in real time.
Further, the fixed temperature acquisition device comprises a temperature acquisition sensor and an online preprocessing unit in communication connection with the temperature sensor, the temperature sensor is fixed on the furnace wall on the inner side of the heating furnace body and transmits acquired real-time temperature data to the preprocessing unit, and the preprocessing unit stores and screens the real-time temperature data transmitted by the temperature sensor and transmits the real-time temperature data to the controller.
Further, the temperature acquisition sensor is a thermocouple sensor or an infrared sensor.
Further, the preprocessing unit is connected with the controller in a wireless mode or in a wired mode.
The invention also discloses an online furnace temperature control method, which is characterized by comprising the following steps: comprises the following steps
and 3, dynamically controlling the heating power of the heating element by comparing the real-time temperature field with the process file specification.
According to the deviation of the temperature set value and the actual temperature value, after the deviation is calculated by the feedback controller, the regulating valve of the heating element is controlled to finally act on the heating element, and the accurate control of the furnace temperature of the heating furnace body is realized.
Further, the step 2 includes:
step 21, acquiring the furnace temperature of each position in the heating furnace through a fixed temperature acquisition device fixed in the heating furnace, and transmitting the acquisition result to a controller;
step 22, acquiring the furnace temperature of the position of the workpiece through a movable temperature acquisition device synchronously driven with the workpiece, tracking the position of the workpiece in the heating furnace body, and transmitting an acquisition result to a controller;
and 23, calculating a real-time temperature field in the heating furnace body by the controller according to the furnace temperature of each position, the furnace temperature of the position of the workpiece and the position of the workpiece.
Further, the controller comprises a monitoring computer and a programmable logic controller which are communicated with each other, the editable logic controller comprises a comparator and a control feedback device, the comparator compares a given temperature value with a temperature value of a real-time temperature field and transmits a comparison result to the control feedback device, and the control feedback device is in communication connection with the regulating valve of the heating element and controls the opening and closing size of the regulating valve.
Drawings
FIG. 1 is a block diagram showing the structure of embodiment 1 of the present invention;
FIG. 2 is a plan view of a heating furnace body in embodiment 1 of the present invention;
FIG. 3 is a side view of a heating furnace body in embodiment 1 of the present invention;
fig. 4 is a flowchart in embodiment 2 of the present invention.
In the figure:
1-a heating furnace body, 2-a guide rail, 3-a workpiece, 4-a fixed temperature acquisition device, 5-a movable temperature acquisition device, 6-a controller, 7-a heating element and 8-a regulating valve.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Example 1
The heating furnace comprises a heating furnace body 1 and a guide rail 2 penetrating through the heating furnace body 1, a workpiece 3 to be processed is placed on the guide rail 2, the heating furnace body 1 is sequentially provided with a rapid heating area, a temperature control area and a constant temperature area from an inlet to an outlet, heating is carried out through a heating element 7 in the heating furnace body 1, and the temperature of each area in the heating furnace body 1 can be changed by controlling the heating power of the heating element 7.
Referring to the attached drawings 1-3, the online furnace temperature control system for the heating furnace comprises a fixed temperature acquisition device 4, a movable temperature acquisition device 5, a controller 6 and a regulating valve 8 arranged on a heating element 7. The fixed temperature acquisition devices 4 are uniformly distributed on the furnace wall on the inner side of the heating furnace body 1 and are used for acquiring the furnace temperature of the corresponding position in the hearth. The movable temperature acquisition device 5 moves together with the workpiece 3 in the heating furnace body 1 and is used for acquiring the temperature of the workpiece 3. The fixed temperature acquisition device 4 and the movable temperature acquisition device 5 are in communication connection with the input end of the controller 6, acquired temperature data are sent to the controller 6, and the controller 6 establishes a real-time temperature field according to the temperature data. The output end of the controller 6 is in communication connection with the regulating valve 8 and is used for controlling the regulating valve 8 to regulate the heating power of the heating element 7 according to the real-time temperature field.
A feedback controller is arranged in the controller 6, the accurate control of the controller 6 adopts a closed-loop feedback control technology, and the control valve 8 of the heating element 7 is controlled by the feedback controller after calculation according to the deviation of a temperature set value and a real-time temperature value, and finally acts on the heating element 7.
The furnace temperature is monitored on line, the controller 6 can obtain the temperature of the position of the fixed temperature acquisition device 4 in real time, and the real-time temperature field is obtained by combining the temperature data acquired by the fixed temperature acquisition device 4, the heating power of the heating elements 7 is reasonable by comparing the layout of the heating elements 7 in the heating furnace preset according to the process, and the accurate control of the furnace temperature is realized. The accurate heating of the workpieces 3 with different drying requirements is realized, the control precision of the target temperature of the workpieces 3 can be improved, the energy consumption is reduced, and the heating quality of the workpieces 3 is stable and reliable.
The mobile temperature acquisition device 5 comprises an online furnace temperature tester, and the online furnace temperature tester is in wireless connection or wired connection with the controller 6. The movable temperature acquisition device 5 is fixed on the workpiece 3 or on the guide rail 2 used for conveying the workpiece 3 and is positioned on one side of the workpiece 3, and the temperature acquisition device and the workpiece 3 are in synchronous transmission. The mobile temperature acquisition device 5 further comprises a position sensor for tracking the position of the workpiece 3 in the heating furnace, the position of the workpiece 3 in the heating furnace is acquired in real time, and the temperature data is combined with the position data to form a real-time temperature field.
The fixed temperature acquisition device 4 comprises a temperature acquisition sensor and an online preprocessing unit in communication connection with the temperature sensor, the temperature sensor is fixed on the furnace wall on the inner side of the heating furnace body 1, acquired real-time temperature data are transmitted to the preprocessing unit, and the preprocessing unit stores and screens the real-time temperature data transmitted by the temperature sensor and transmits the real-time temperature data to the controller 6. The temperature acquisition sensor is a thermocouple sensor or an infrared sensor. The preprocessing unit is in wireless connection or wired connection with the controller 6, and wireless connection can be 4G, 5G or wifi.
The furnace temperature is monitored by adopting an online method, a real-time temperature field is formed by combining the fixed temperature acquisition device 4 and the movable temperature acquisition device 5, and real-time correction is carried out through the real-time temperature field. The temperature control to the work piece 3 is more accurate, and the furnace temperature curve debugging to heating furnace equipment is more convenient, high-efficient, can also reduce the energy consumption simultaneously.
Example 2
Referring to the attached figure 4, the invention also discloses an online furnace temperature control method, which comprises the following steps
And 2, detecting the acquired data based on the fixed temperature acquisition device 4 and the movable temperature acquisition device 5 to form a real-time temperature field in the heating furnace body 1.
The step 2 comprises the following steps:
step 21, acquiring the furnace temperature of each position in the heating furnace body 1 through a fixed temperature acquisition device 4 fixed in the heating furnace body 1, and transmitting an acquisition result to a controller 6;
step 22, acquiring the furnace temperature of the position of the workpiece 3 through the movable temperature acquisition device 5 synchronously driven with the workpiece 3, tracking the position of the workpiece 3 in the heating furnace, and transmitting the acquisition result to the controller 6;
and 23, calculating a real-time temperature field in the hot furnace by the controller 6 according to the furnace temperature of each position, the furnace temperature of the position of the workpiece 3 and the position of the workpiece 3.
And 3, dynamically controlling the heating power of the heating element 7 by comparing the real-time temperature field with the specification of the process file.
The controller 6 comprises a monitoring computer and a programmable logic controller which are communicated with each other, and the monitoring computer can record a control result and burn and record logic operation to the programmable logic controller. The editable logic controller comprises a comparator and a control feedback device, the comparator compares a given temperature value with a temperature value of a real-time temperature field, and transmits a comparison structure to the control feedback device, and the control feedback device is in communication connection with the regulating valve 8 of the heating element 7 and controls the opening and closing size of the regulating valve 8. When the comparator detects that the given temperature value is larger than the temperature value of the real-time temperature field, the comparator outputs O, the control feedback device receives a signal, the control regulating valve 8 is controlled to act, and the heating power of the heating element 7 at the corresponding position is increased; when the comparator detects that the given temperature value is smaller than the temperature value of the real-time temperature field, the given temperature value is output, the control feedback device receives the signal, the control regulating valve 8 acts, and the heating power of the heating element 7 at the corresponding position is reduced. And the on-line dynamic adjustment of the furnace temperature in the heating furnace is realized.
According to the deviation between the temperature set value and the actual temperature value, after the deviation is calculated by the feedback controller, the regulating valve 8 of the heating element 7 is controlled to finally act on the heating element 7, and the accurate control of the furnace temperature of the heating furnace is realized.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides an online furnace temperature control system of heating furnace which characterized in that: the heating furnace comprises a fixed temperature acquisition device, a movable temperature acquisition device, a controller and an adjusting valve arranged on a heating element, wherein the fixed temperature acquisition device is uniformly distributed on the furnace wall on the inner side of a heating furnace body and is used for acquiring the furnace temperature at a corresponding position in a furnace chamber; the movable temperature acquisition device moves together with the workpiece in the heating furnace and is used for acquiring the temperature of the workpiece; the fixed temperature acquisition device and the movable temperature acquisition device are in communication connection with the input end of the controller, and transmit acquired temperature data to the controller, and the controller establishes a real-time temperature field according to the temperature data; and the output end of the controller is in communication connection with the regulating valve and is used for controlling the regulating valve to regulate the heating power of the heating element according to the real-time temperature field.
2. The on-line furnace temperature control system of the heating furnace according to claim 1, wherein: the mobile temperature acquisition device comprises an online furnace temperature tester, and the online furnace temperature tester is in wireless connection or wired connection with the controller.
3. The on-line furnace temperature control system of the heating furnace according to claim 2, wherein: the movable temperature acquisition device is fixed on the workpiece or is positioned on one side of the workpiece and fixed on a guide rail for conveying the workpiece, and the temperature acquisition device and the workpiece are in synchronous transmission.
4. The on-line furnace temperature control system of the heating furnace according to claim 1, wherein: the fixed temperature acquisition device comprises a temperature acquisition sensor and an online preprocessing unit in communication connection with the temperature sensor, the temperature sensor is fixed on the furnace wall on the inner side of the heating furnace body and transmits acquired real-time temperature data to the preprocessing unit, and the preprocessing unit stores and screens the real-time temperature data transmitted by the temperature sensor and transmits the real-time temperature data to the controller.
5. The on-line furnace temperature control system of the heating furnace of claim 4, wherein: the temperature acquisition sensor is a thermocouple sensor or an infrared sensor.
6. The on-line furnace temperature control system of the heating furnace of claim 4, wherein: the preprocessing unit is in wireless connection or wired connection with the controller.
7. An online furnace temperature control method for a heating furnace is characterized by comprising the following steps: comprises the following steps
Step 1, calculating and determining the heating power of each heating element according to the process file specification of a workpiece and a given temperature value;
step 2, forming a real-time temperature field in the heating furnace body based on the acquired data of the fixed temperature acquisition device and the movable temperature acquisition device;
and 3, dynamically controlling the heating power of the heating element by comparing the real-time temperature field with the process file specification.
8. The on-line furnace temperature control method of the heating furnace according to claim 7, characterized in that: the step 2 comprises
Step 21, acquiring the temperature in the heating furnace at each position in the heating furnace body through a fixed temperature acquisition device fixed in the heating furnace body, and transmitting an acquisition result to a controller;
step 22, acquiring the furnace temperature of the position of the workpiece through a movable temperature acquisition device synchronously driven with the workpiece, tracking the position of the workpiece in the heating furnace, and transmitting the acquisition result to a controller;
and 23, calculating a real-time temperature field in the heating furnace body by the controller according to the furnace temperature of each position, the furnace temperature of the position of the workpiece and the position of the workpiece.
9. The on-line furnace temperature control method of the heating furnace according to claim 8, characterized in that: the controller comprises a monitoring computer and a programmable logic controller which are communicated with each other, the editable logic controller comprises a comparator and a control feedback device, the comparator compares a given temperature value with a temperature value of a real-time temperature field and transmits a comparison result to the control feedback device, and the control feedback device is in communication connection with the regulating valve of the heating element and controls the opening and closing size of the regulating valve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115094228A (en) * | 2022-05-13 | 2022-09-23 | 燕山大学 | Portable black box full-furnace-condition synchronous temperature measurement array for heating furnace |
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