CN111551045B - Control method for heating temperature of cylindrical workpiece - Google Patents

Control method for heating temperature of cylindrical workpiece Download PDF

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Publication number
CN111551045B
CN111551045B CN202010327174.4A CN202010327174A CN111551045B CN 111551045 B CN111551045 B CN 111551045B CN 202010327174 A CN202010327174 A CN 202010327174A CN 111551045 B CN111551045 B CN 111551045B
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heated
temperature
workpiece
burner
heating
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CN111551045A (en
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高新亮
任善银
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Huizhou Nanotec Alloy Technology Co ltd
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Yanshan University
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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
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/02—Observation or illuminating devices
    • 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
    • F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
    • 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
    • F27D2019/0087—Automatisation of the whole plant or activity
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/02—Observation or illuminating devices
    • F27D2021/026—Observation or illuminating devices using a video installation
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/0014—Devices for monitoring temperature

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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Abstract

The invention discloses a control device for the heating temperature of a cylindrical workpiece, which comprises a control device body, the control device body is provided with a bracket for supporting a plurality of workpieces to be heated, the workpieces to be heated are uniformly and symmetrically distributed in the heating furnace, temperature thermocouples are arranged at the positions where the bracket is contacted with a plurality of workpieces to be heated, a temperature measuring camera is arranged on the inner furnace surface of the heating furnace, a left burner and a right burner are respectively arranged on the furnace surfaces at the two sides, the heating furnace is electrically connected with a computer for acquiring, processing and heating regulation and control of heating temperature signals of a plurality of workpieces to be heated, the traditional control method taking the temperature in the furnace as an object is abandoned, the workpieces to be heated are directly taken as targets for temperature regulation and control, and the heating control precision, the effective heating rate of the workpieces to be heated and the heating quality are greatly improved.

Description

Control method for heating temperature of cylindrical workpiece
Technical Field
The invention relates to the technical field of heat treatment, in particular to a control device and a control method for the heating temperature of a cylindrical workpiece.
Background
The regenerative heating furnace can preheat fuel by using the waste heat of the flue gas in the heating process, has the advantages of low fuel consumption, relatively uniform temperature in the furnace, high heating quality, environmental protection and the like, and is widely applied to the heating process of various workpieces. Because the regenerative heating furnace relates to a dynamic continuous reversing process in the combustion process, the temperature of the upper part of the furnace has the fluctuation characteristic; a viscous turbulent layer is formed at the bottom of the workpiece to be heated, which is not beneficial to heat exchange around the workpiece to be heated; the mutual interference of the burner gas flow and the furnace tail flue backflow gas causes different flow velocity directions at different positions; the temperature of the upper part and the lower part of the workpiece to be heated is layered.
At present, in order to overcome the above problems and fully exert the advantages of the regenerative heating furnace, many enterprises and researchers mostly adopt a field experience or numerical simulation method to study the heating process in the heating furnace, so as to optimize the heating process. But still have the following disadvantages: the effectiveness of field experience is limited only to specific plants and products and the heating process is poorly repeatable. The numerical simulation method has the advantages of complex process, overlong consumed time, properly simplified calculation model during simulation, low simulation result accuracy, reduced production efficiency and increased production cost. In addition, the method of field experience or numerical simulation is mainly used for researching the environment condition in the furnace, and the real-time adjustment of the heating process is not performed according to the heating condition of the workpiece to be heated, so that the effective heating rate and the heating quality are reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a control device and a control method for the heating temperature of a cylindrical workpiece, starting from the realization of taking the workpiece to be heated as a target control object, regulating and controlling the heating working condition by using machine vision temperature measurement, and improving the heating efficiency and the heating quality of the workpiece to be heated.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a controlling means of cylindrical work piece heating temperature, includes the controlling means body, the controlling means body is provided with the bracket that supports a plurality of work pieces of waiting to heat, and is a plurality of the even, symmetrical distribution of work piece of waiting to heat is in the heating furnace, the bracket all is provided with the temperature thermocouple with the position of a plurality of work piece contacts of waiting to heat, be provided with temperature measurement camera on the interior furnace face of heating furnace, be provided with left side nozzle and right side nozzle on the furnace face of both sides respectively, heating furnace electric connection has carries out the computer of collection processing and heating regulation and control to a plurality of work pieces of waiting to heat temperature signal.
The technical scheme of the invention is further improved as follows: a plurality of workpieces to be heated are equally divided into four temperature measuring cameras for temperature monitoring, and the four temperature measuring cameras are uniformly distributed at four top points of the external square of the end face of the corresponding workpiece to be heated.
The technical scheme of the invention is further improved as follows: the injection angles of the left burner and the right burner can be adjusted.
The technical scheme of the invention is further improved as follows: a control method of a cylindrical workpiece heating temperature control device comprises the following steps:
numbering workpieces to be heated from right to left as follows: 1, 2, · n; dividing the heating temperature of the workpiece to be heated into heating stages: t isr＝T1、T2、T3、…、TmWhich isWhere r is 1 … m, and T1＜T2＜T3＜…＜Tm；
Secondly, dividing the injection angle of the left burner into: thetaL0、θL1、θL2、...、θLj、...、θLnAnd the injection angle of the right burner is divided into: thetaR0、θR1、θR2、...、θRk、...θRn，
Wherein: l represents a left burner, and R represents a right burner;
θL0: an included angle is formed between a horizontal ray which is made by taking the left burner as a starting point and a tangent position at the right side of the workpiece to be heated with the number i being 1;
θLj: an included angle between a ray which is made by taking the left burner as a starting point and a tangential position on the right side of the workpiece to be heated with the serial number of i-j and a ray which is made by taking the left burner as a starting point and a tangential position on the right side of the workpiece to be heated with the serial number of i-j +1 is formed, wherein j is more than or equal to 1 and is less than N, and j belongs to N;
θLn: an included angle between a ray which is made by taking the left burner as a starting point and a tangential position on the right side of the workpiece to be heated with the serial number of i-n and a ray which is made by taking the left burner as a starting point and a tangential position on the left side of the workpiece to be heated with the serial number of i-n;
θR1: an included angle between a ray which is made by taking the right burner as a starting point and a tangential position on the left side of the workpiece to be heated with the serial number i being 1 and a ray which is made by taking the right burner as a starting point and a tangential position on the right side of the workpiece to be heated with the serial number i being 1;
θRk(ii) a An included angle between a ray taken by taking the right burner as a starting point and a tangential position on the left side of the workpiece to be heated with the serial number of i-k-1 and a ray taken by taking the right burner as a starting point and a tangential position on the left side of the workpiece to be heated with the serial number of i-k is larger than 1 and smaller than or equal to N, and k belongs to N;
θR0an included angle is formed between a horizontal ray which is made by taking the right burner as a starting point and a tangent position at the left side of the workpiece to be heated with the serial number of i-n;
thirdly, numbering according to the horizontal symmetry axis and the vertical symmetry axis asi to-be-heated workpiece is uniformly divided into A, B, C, D four areas, and four corresponding temperature measuring cameras MiA、MiB、MiC、MiDCarry out temperature monitoring, temperature measurement camera M to A, B, C, D four regions respectivelyiA、MiB、MiC、MiDWithin the range of working angle beta, the working period is 2 delta t1The uniform-speed reciprocating scanning monitoring can finish the temperature image shooting of a monitoring area twice in one period, wherein: the working angle beta is the maximum included angle between the temperature measuring camera and two end faces of the monitoring area;
fourthly, assigning an initial value: r is 1;
assigning an initial value: when i is 1, the left burner starts to burn;
sixthly, adjusting the injection angle of the left burner to thetaLiPosition, heating the left part of the workpiece to be heated with the serial number i, and simultaneously two temperature measuring cameras MiA、MiCMonitoring the temperature of the left side of the workpiece to be heated with the serial number i;
seventhly, every Δ t for computer1Time-pair temperature-measuring camera MiA、MiCThe shot temperature image is collected, and the temperature is calculated to reach TrSum of image areas Se；
The effective heating rate was calculated as:
Figure GDA0003101598910000041
wherein: s is temperature measuring camera MiA、MiCThe total area of the photographed temperature image;
judging that the effective heating rate sigma is more than or equal to sigmaeIf yes, switching to a step (b), and if not, switching to a step (c), wherein: sigmaeIs the standard effective heating rate;
judging that i is larger than or equal to n, if the i is not equal to i +1, turning to the step (sixthly), and if the i is equal to i +1, stopping combustion of the left burner;
ninthly, if the value i is equal to n, the right burner starts to burn;
adjusting injection angle of right burner to thetaRiPosition, heating the right part of the workpiece to be heated with the serial number i, and simultaneously carrying out two temperature measurement camerasImage head MiB、MiDMonitoring the temperature of the right side of the workpiece to be heated with the serial number i;
Figure GDA0003101598910000042
every delta t of the computer1Time-pair temperature-measuring camera MiB、MiDThe shot temperature image is collected, and the temperature is counted to reach TrSum of image areas Se；
The effective heating rate was calculated as:
Figure GDA0003101598910000043
wherein: s is temperature measuring camera MiB、MiDThe total area of the photographed temperature image;
judging that the effective heating rate sigma is more than or equal to sigmaeIf not, go to step R, if yes, go to step R
Figure GDA0003101598910000045
Wherein sigmaeIs the standard effective heating rate;
Figure GDA0003101598910000046
judging that i is less than or equal to 1, if the i is not equal to i-1, switching to the step (R), and if the i is equal to i-1, switching to the step (R), and stopping combustion of the right burner;
Figure GDA0003101598910000047
computer reading temperature thermocouple O1、O2、...、Oi、...、OnTemperature monitoring value TO1、TO2、...、TOi、...、TOn；
Calculating TO＝min{TO1、TO2、...、TOi、...、TOn}；
Judgment of TO≥TrIf not, the step is carried out
Figure GDA0003101598910000051
If yes, switching to the step
Figure GDA0003101598910000052
Figure GDA0003101598910000053
Adjusting the injection angle of the left burner to thetaL0At the position, the left burner starts to burn, the left part of the workpiece to be heated is heated, and delta t is heated2After the time, the left burner stops burning;
adjusting the injection angle of the right burner to thetaR0At the position, the right burner starts to burn, and the right part of the workpiece to be heated is heated by delta t2After the time, the right burner stops burning, and the step is shifted to
Figure GDA0003101598910000054
Figure GDA0003101598910000055
And (4) judging that r is larger than or equal to m, if not, assigning r to r +1, turning to the fifth step, if so, finishing heating, and stopping heating.
Due to the adoption of the technical scheme, the invention has the technical progress that:
1. the invention abandons the traditional control method taking the temperature in the furnace as an object, directly takes the workpiece to be heated as a target to carry out temperature regulation and control, and greatly improves the control precision of heating and the effective heating rate and the heating quality of the workpiece to be heated.
2. The invention provides a novel temperature measurement camera arrangement mode and a working method, each workpiece to be heated is divided into four regions, each region is monitored in an all-dimensional scanning mode by using one temperature measurement camera, the ratio of the monitoring area to the surface area of the workpiece to be heated is increased to more than ninety percent, the problem of low ratio of the monitoring area caused by mutual shielding of the workpieces to be heated at different positions is solved, and the reliability of the workpiece to be heated is greatly improved.
3. The invention divides the burner angles, so that heating can be performed aiming at workpieces to be heated appointed at different positions, the utilization rate and the heating efficiency of fuel are improved, and the production cost is reduced.
Drawings
FIG. 1 is a schematic view of the operation of a furnace according to the present invention;
FIG. 2 is a flow chart of a method for controlling the heating temperature of a cylindrical workpiece according to the present invention;
FIG. 3 is a schematic view showing the arrangement of a temperature measuring camera of a workpiece to be heated, which is numbered i according to the present invention;
FIG. 4 is a schematic view of the invention in the direction E shown in FIG. 3;
FIG. 5 is a schematic diagram of different working angle positions of the left burner and the left burner of the present invention;
in fig. 1: 1. a computer; 2. a bracket; 3. a workpiece to be heated; 4. a left burner; 5. a right burner; 6. and (5) heating the furnace.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
the workpiece 3 to be heated adopts a round steel pipe, and the specification and the size are as follows: phi 200mm x 2300mm, inner diameter
Figure GDA0003101598910000062
The heating temperature is required to be more than or equal to 650 ℃ and less than or equal to 700 ℃; the serial number n of the round steel pipe is 5; standard effective heating rate sigmae＝90％。
As shown in a working schematic diagram of a heating furnace shown in fig. 1, a control device for heating temperature of a cylindrical workpiece comprises a control device body, wherein the control device body is provided with a bracket 2 for supporting a plurality of workpieces 3 to be heated, the plurality of workpieces 3 are uniformly and symmetrically distributed on the front side and the rear side in the heating furnace 6, temperature thermocouples are arranged at the positions where the bracket 2 is contacted with the plurality of workpieces 3 to be heated, a temperature measuring camera is arranged on the inner furnace surface of the heating furnace 6, a left burner 4 and a right burner 5 are respectively arranged on the furnace surfaces on the two sides, the heating furnace 6 is electrically connected with a computer 1 for collecting, processing and heating and regulating heating temperature signals of the plurality of workpieces 3 to be heated, the plurality of workpieces 3 to be heated are respectively subjected to temperature monitoring by four temperature measuring cameras, the four temperature measuring cameras are uniformly distributed at four vertex points of a square externally connected with the end surface of the corresponding workpieces 3 to be heated, the injection angles of the left burner 4 and the right burner 5 can be adjusted.
Although the existing method for realizing the temperature control of the heat accumulating type heating furnace through a numerical simulation mode can well improve the temperature distribution in the heating furnace, the technology takes the furnace temperature as a target control object and belongs to a rough heating mode, so that the effective heating rate of a workpiece to be heated is not matched with the production cost of the workpiece to be heated.
The effective heating rate is the ratio of the sum of the areas of the sampling part reaching the qualified temperature to the sum of the areas of the sampling part, and the calculation formula is as follows:
Figure GDA0003101598910000061
wherein: σ — effective heating Rate;
Se-the sum of the areas of the sampling site that reach the acceptable temperature;
s is the sum of the areas of the sampling parts;
in order to solve the above problems, the invention provides a control method for targeting a workpiece 3 to be heated as shown in fig. 2, which is based on a machine vision technology, takes images shot by a temperature measurement camera as a criterion, adjusts the injection angles and the working states of a left burner 4 and a right burner 5 in real time, and circularly heats the workpiece 3 to be heated at different axial positions in sequence, and specifically comprises the following steps:
numbering the workpieces 3 to be heated from right to left in sequence as follows: 1, 2, · n; the heating temperature of the workpiece 3 to be heated is divided into heating stages: t isr＝T1、T2、T3、…、TmWherein r is 1 … m, and T1＜T2＜T3＜…＜Tm；
Secondly, dividing the injection angle of the left burner 4 into: thetaL0、θL1、θL2、...、θLj、...、θLnAnd the injection angle of the right burner 5 is divided into: thetaR0、θR1、θR2、...、θRk、...θRn，
Wherein: l represents a left burner, and R represents a right burner;
θL0: an included angle between a horizontal ray which is made by taking the left burner 4 as a starting point and a tangent position at the right side of the workpiece to be heated 3 with the serial number of i being 1;
θLj: an included angle between a ray taken by taking the left burner 4 as a starting point and a tangent position on the right side of the workpiece to be heated with the serial number of i-j and a ray taken by taking the left burner 4 as a starting point and a tangent position on the right side of the workpiece to be heated with the serial number of i-j +1, wherein j is more than or equal to 1 and is less than N, and j belongs to N;
θLn: an included angle between a ray which is made by taking the left burner 4 as a starting point and a tangent position on the right side of the workpiece to be heated with the serial number of i-n and a ray which is made by taking the left burner 4 as a starting point and a tangent position on the left side of the workpiece to be heated with the serial number of i-n;
θR1: an included angle between a ray which is made by taking the right burner 5 as a starting point and a tangential position on the left side of the workpiece 3 to be heated with the serial number i being 1 and a ray which is made by taking the right burner 5 as a starting point and a tangential position on the right side of the workpiece 3 to be heated with the serial number i being 1;
θRk(ii) a An included angle between a ray taken by taking the right burner 5 as a starting point and a tangential position on the left side of the workpiece to be heated 3 with the serial number of i-k-1 and a ray taken by taking the right burner 5 as a starting point and a tangential position on the left side of the workpiece to be heated 3 with the serial number of i-k is larger than 1 and smaller than or equal to N, and k belongs to N;
θR0an included angle is formed between a horizontal ray taking the right burner 5 as a starting point and a tangent position on the left side of the workpiece 3 to be heated with the serial number of i-n;
thirdly, the workpiece 3 to be heated with the serial number i is evenly divided into A, B, C, D four areas according to the horizontal symmetry axis and the vertical symmetry axis, and four corresponding temperature measuring cameras MiA、MiB、MiC、MiDA, B, C, D four zones were separately temperature monitoredTemperature measuring camera MiA、MiB、MiC、MiDWithin the range of working angle beta, the working period is 2 delta t1The uniform-speed reciprocating scanning monitoring can finish the temperature image shooting of a monitoring area twice in one period, wherein: the working angle beta is the maximum included angle delta t between the temperature measuring camera and two end faces of the monitoring area1Selecting a numerical value according to the sensitivity of the equipment, wherein the smaller the numerical value is, the better the numerical value is;
fourthly, assigning an initial value: r is 1;
assigning an initial value: when i is 1, the left burner 4 starts to burn;
sixthly, adjusting the injection angle of the left burner 4 to thetaLiPosition, heating the left part of the workpiece 3 to be heated with the serial number i, and simultaneously two temperature measuring cameras MiA、MiCMonitoring the temperature of the left side of the workpiece 3 to be heated with the serial number i;
seventhly, every other delta t of the computer 11Time-pair temperature-measuring camera MiA、MiCThe shot temperature image is collected, and the temperature is calculated to reach TrSum of image areas Se；
The effective heating rate was calculated as:
Figure GDA0003101598910000081
wherein: s is temperature measuring camera MiA、MiCThe total area of the photographed temperature image;
judging that the effective heating rate sigma is more than or equal to sigmaeIf yes, switching to a step (b), and if not, switching to a step (c), wherein: sigmaeIs the standard effective heating rate;
judging that i is larger than or equal to n, if the i is not equal to i +1, turning to the step (sixthly), and if the i is equal to i +1, stopping combustion of the left burner 4;
ninthly, if the value i is equal to n, the right burner 5 starts to burn;
adjusting the injection angle of the right burner 5 to thetaRiPosition, heating the right part of the workpiece 3 to be heated with the serial number i, and simultaneously two temperature measuring cameras MiB、MiDMonitoring the temperature of the right side of the workpiece 3 to be heated with the serial number i;
Figure GDA0003101598910000091
every delta t of the computer1Time-pair temperature-measuring camera MiB、MiDThe shot temperature image is collected, and the temperature is counted to reach TrSum of image areas Se；
The effective heating rate was calculated as:
Figure GDA0003101598910000092
wherein: s is temperature measuring camera MiB、MiDThe total area of the photographed temperature image;
judging that the effective heating rate sigma is more than or equal to sigmaeIf not, go to step R, if yes, go to step R
Figure GDA0003101598910000093
Wherein sigmaeIs the standard effective heating rate;
Figure GDA0003101598910000094
judging that i is less than or equal to 1, if the i is not equal to i-1, switching to the step (R), and if the i is equal to i, switching to the step (R), and stopping combustion of the right burner 5;
Figure GDA0003101598910000095
computer 1 reads temperature thermocouple O1、O2、...、Oi、...、OnTemperature monitoring value TO1、TO2、...、TOi、...、TOn；
Calculating TO＝min{TO1、TO2、...、TOi、...、TOn}；
Judgment of TO≥TrIf not, the step is carried out
Figure GDA0003101598910000096
If yes, switching to the step
Figure GDA0003101598910000097
Figure GDA0003101598910000101
Adjusting the injection angle of the left burner 4 to thetaL0At the position, the left burner 4 starts to burn, and the left part of the workpiece 3 to be heated is heated by delta t2After the time, the left burner 4 stops burning;
adjusting the injection angle of the right burner 5 to thetaR0At the position, the right burner 5 starts to burn, and the right part of the workpiece 3 to be heated is heated by delta t2After the time, the right burner 5 stops burning, and the process is shifted to the step
Figure GDA0003101598910000102
Figure GDA0003101598910000103
And (4) judging that r is larger than or equal to m, if not, assigning r to r +1, turning to the fifth step, if so, finishing heating, and stopping heating.
The temperature measuring cameras used in the heating furnace 6 have the problems that shielding exists between workpieces to be heated 3 at different positions, the ratio of the monitored area of the temperature measuring cameras to the surface area of the workpieces to be heated is low, and the reliability is poor. According to the phenomenon, the invention provides a novel temperature measurement camera arrangement mode and a working method, the monitoring area is increased to more than ninety percent, and the reliability of regulating and controlling the heating temperature in the steps of the method is greatly improved.
In addition, because the contact part of the workpiece 3 to be heated and the bracket 2 is shielded, the temperature measuring camera cannot monitor the temperature of the contact part, and the temperature measuring thermocouples O are arranged at the contact positions of the workpiece 3 to be heated and the bracket 2 with the serial numbers of 1, 2, 11、O2、...、Oi、...、OnAnd the temperature of the sheltered part is subjected to supplementary monitoring.

Claims (3)

1. The control method of the heating temperature of the cylindrical workpiece is characterized by comprising a control device, wherein the control device comprises a control device body, the control device body is provided with a bracket (2) for supporting a plurality of workpieces to be heated (3), the workpieces to be heated (3) are uniformly and symmetrically distributed in a heating furnace (6), temperature measuring thermocouples are arranged at the positions where the bracket (2) is contacted with the workpieces to be heated (3), a temperature measuring camera for monitoring the temperature of the workpieces to be heated (3) is arranged on the inner furnace surface of the heating furnace (6), a left burner (4) and a right burner (5) are respectively arranged on the furnace surfaces on two sides, and the heating furnace (6) is electrically connected with a computer (1) for collecting, processing and heating and regulating and controlling the heating temperature signals of the workpieces to be heated (3);
the control method comprises the following steps:
numbering the workpieces (3) to be heated from right to left in sequence as follows: 1, 2, · n; dividing the heating temperature of the workpiece (3) to be heated into heating stages: t isr＝T1、T2、T3、…、TmWherein r is 1 … m, and T1＜T2＜T3＜…＜Tm；
Secondly, dividing the injection angle of the left burner (4) into: thetaL0、θL1、θL2、...、θLj、...、θLnAnd the injection angle of the right burner (5) is divided into: thetaR0、θR1、θR2、...、θRk、...θRn，
Wherein: l represents a left burner, and R represents a right burner;
θL0: an included angle is formed between a horizontal ray which is made by taking the left burner (4) as a starting point and a tangent position at the right side of the workpiece (3) to be heated with the serial number of i-1;
θLj: an included angle between a ray which is made by taking the left burner (4) as a starting point and a tangential position on the right side of the workpiece to be heated (3) with the serial number of i-j and a ray which is made by taking the left burner (4) as a starting point and a tangential position on the right side of the workpiece to be heated (3) with the serial number of i-j +1 is formed, wherein j is more than or equal to 1 and is less than N, and j belongs to N;
θLn: an included angle is formed between a ray which is made by taking the left burner (4) as a starting point and a tangential position on the right side of the workpiece (3) to be heated with the serial number of i-n and a ray which is made by taking the left burner (4) as a starting point and a tangential position on the left side of the workpiece (3) to be heated with the serial number of i-n;
θR1: an included angle is formed between a ray which is made by taking the right burner (5) as a starting point and a tangential position on the left side of the workpiece (3) to be heated with the serial number i being 1 and a ray which is made by taking the right burner (5) as a starting point and a tangential position on the right side of the workpiece (3) to be heated with the serial number i being 1;
θRk(ii) a An included angle between a ray taken by taking the right burner (5) as a starting point and a tangential position on the left side of the workpiece to be heated (3) with the serial number of i-k-1 and a ray taken by taking the right burner (5) as a starting point and a tangential position on the left side of the workpiece to be heated (3) with the serial number of i-k is larger than 1 and smaller than or equal to N, and k belongs to N;
θR0an included angle is formed between a horizontal ray taking the right burner (5) as a starting point and a tangent position at the left side of the workpiece (3) to be heated, wherein the number of the workpiece is i-n;
thirdly, the workpiece (3) to be heated with the serial number i is evenly divided into A, B, C, D four areas according to the horizontal symmetry axis and the vertical symmetry axis, and four corresponding temperature measuring cameras MiA、MiB、MiC、MiDCarry out temperature monitoring, temperature measurement camera M to A, B, C, D four regions respectivelyiA、MiB、MiC、MiDWithin the range of working angle beta, the working period is 2 delta t1The uniform-speed reciprocating scanning monitoring can finish the temperature image shooting of a monitoring area twice in one period, wherein: the working angle beta is the maximum included angle between the temperature measuring camera and two end faces of the monitoring area;
fourthly, assigning an initial value: r is 1;
assigning an initial value: when i is 1, the left burner (4) starts to burn;
sixthly, adjusting the injection angle of the left burner (4) to thetaLiPosition, namely heating the left part of the workpiece (3) to be heated with the serial number i, and simultaneously two temperature measuring cameras MiA、MiCMonitoring the temperature of the left side of the workpiece (3) to be heated, which is numbered i;
seventh, the meterThe computer (1) is arranged at intervals of delta t1Time-pair temperature-measuring camera MiA、MiCThe shot temperature image is collected, and the temperature is calculated to reach TrSum of image areas Se；
The effective heating rate was calculated as:
Figure FDA0003101598900000031
wherein: s is temperature measuring camera MiA、MiCThe total area of the photographed temperature image;
judging that the effective heating rate sigma is more than or equal to sigmaeIf yes, switching to a step (b), and if not, switching to a step (c), wherein: sigmaeIs the standard effective heating rate;
judging that i is larger than or equal to n, if the i is not equal to i +1, turning to a step (sixthly), and if the i is equal to i +1, stopping combustion of the left burner (4);
ninthly, if the value i is equal to n, the right burner (5) starts to burn;
adjusting the injection angle of a right burner (5) to thetaRiPosition, heating the right part of the workpiece (3) to be heated with the serial number i, and simultaneously two temperature measuring cameras MiB、MiDMonitoring the temperature of the right side of the workpiece (3) to be heated with the serial number i;
Figure FDA0003101598900000036
every delta t of the computer1Time-pair temperature-measuring camera MiB、MiDThe shot temperature image is collected, and the temperature is counted to reach TrSum of image areas Se；
The effective heating rate was calculated as:
Figure FDA0003101598900000032
wherein: s is temperature measuring camera MiB、MiDThe total area of the photographed temperature image;
judging that the effective heating rate sigma is more than or equal to sigmaeIf not, go to step R, if yes, go to step R
Figure FDA0003101598900000033
Wherein sigmaeIs the standard effective heating rate;
Figure FDA0003101598900000034
judging that i is less than or equal to 1, if the i is not equal to i-1, switching to the step (R), and if the i is equal to i, switching to the step (R), and stopping combustion of the right burner (5);
Figure FDA0003101598900000035
reading temperature thermocouple O by computer (1)1、O2、...、Oi、...、OnTemperature monitoring value TO1、TO2、...、TOi、...、TOn；
Calculating TO＝min{TO1、TO2、...、TOi、...、TOn}；
Judgment of TO≥TrIf not, the step is carried out
Figure FDA0003101598900000041
If yes, switching to the step
Figure FDA0003101598900000042
Figure FDA0003101598900000043
Adjusting the injection angle of the left burner (4) to thetaL0At the position, the left burner (4) starts to burn, the left part of the workpiece (3) to be heated is heated, and delta t is heated2After the time, the left burner (4) stops burning;
adjusting the injection angle of the right burner (5) to thetaR0At the position, the right burner (5) starts to burn, and the right part of the workpiece (3) to be heated is heated by delta t2After the time, the right burner (5) stops burning, and the step is shifted to
Figure FDA0003101598900000044
Figure FDA0003101598900000045
And (4) judging that r is larger than or equal to m, if not, assigning r to r +1, turning to the fifth step, if so, finishing heating, and stopping heating.
2. The method of claim 1, wherein the step of controlling the heating temperature of the cylindrical workpiece comprises: a plurality of waiting to heat work piece (3) are equallyd divide and are carried out temperature monitoring by four temperature measurement cameras, four temperature measurement camera equipartition sets up four apex points department at the external square of corresponding waiting to heat work piece (3) terminal surface.
3. A method of controlling the heating temperature of a cylindrical workpiece as set forth in claim 2, wherein: the injection angles of the left burner (4) and the right burner (5) can be adjusted.
CN202010327174.4A 2020-04-23 2020-04-23 Control method for heating temperature of cylindrical workpiece Expired - Fee Related CN111551045B (en)

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