CN110743923B - Automatic steel pumping system and method for annular heating furnace - Google Patents
Automatic steel pumping system and method for annular heating furnace Download PDFInfo
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- CN110743923B CN110743923B CN201810822011.6A CN201810822011A CN110743923B CN 110743923 B CN110743923 B CN 110743923B CN 201810822011 A CN201810822011 A CN 201810822011A CN 110743923 B CN110743923 B CN 110743923B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 122
- 239000010959 steel Substances 0.000 title claims abstract description 122
- 238000010438 heat treatment Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005086 pumping Methods 0.000 title abstract description 14
- 238000010079 rubber tapping Methods 0.000 claims abstract description 54
- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000005192 partition Methods 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000004148 unit process Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The invention discloses an automatic steel drawing system of an annular heating furnace, which comprises an annular hearth and a furnace bottom, wherein a steel loading area, a heating area and a steel tapping area are sequentially formed in the annular hearth along the rotation direction of the furnace bottom, the automatic steel drawing system comprises a PLC (programmable logic controller) control unit, a steel drawing machine used for drawing a steel billet to be drawn out from the steel tapping area, a driving mechanism used for driving the furnace bottom to rotate, an image acquisition unit used for acquiring an image of the steel tapping area and an image processing unit used for processing an image signal acquired by the image acquisition unit, and the driving mechanism, the steel drawing machine, the image acquisition unit and the image processing unit are all connected with the PLC control unit. The invention discloses an automatic steel pumping method for an annular heating furnace. By adopting the automatic steel pumping system and method for the annular heating furnace, the automatic steel pumping capacity of the annular heating furnace can be improved, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of metallurgical production, in particular to an automatic steel pumping system and method for an annular heating furnace.
Background
In the ferrous metallurgy industry, the annular heating furnace is widely applied to a pipe processing production line and is used for heating a round billet before rolling. The annular heating furnace steel loading and tapping positions are fixed and respectively correspond to the round billet feeding platform and the steel pipe rolling production line, in order to reduce heat dissipation in the furnace, most furnace doors at the steel loading and tapping positions are open small-size furnace doors, and the steel loading and tapping positions are separated from a heating area in the furnace through partition walls. After the steel charging machine charges the round billets into the furnace, the annular heating furnace realizes the rotation of the furnace bottom by means of a furnace bottom driving mechanism, the round billets pass through a heat recovery section, a preheating section, a heating section and a soaking section in the annular furnace respectively to reach a steel tapping position, and then the round billets are drawn out by the steel drawing machine and sent to a rolling production line.
The annular heating furnace is used for placing the bottom of a round billet and generally has two types, one type is provided with a fixed trough, and the other type is not provided with the fixed trough. When the specification difference of the round billets is small, the bottom of a fixed material groove is generally adopted; when the specifications of round billets are greatly different, in order to more flexibly realize round billet distribution in the furnace, a furnace bottom without a fixed material groove is sometimes adopted. Aiming at the annular heating furnace with the fixed material groove, the adjustment and the correction of the rotation precision of the furnace bottom can be realized through the position tracking of the material groove, the limitation of the material groove is also realized, and the collision phenomenon of adjacent round billets can not occur, so the control precision of the position of the round billets in the furnace is good, and the steel drawing machine can be informed to carry out steel drawing operation as long as the round billets are judged to exist at the current position through the fixed grating signal of the steel tapping position, thereby realizing the automatic steel drawing. However, in the case of the ring-shaped heating furnace without a fixed chute, due to the influence of the furnace burden distribution and the furnace bottom driving mechanism, slight deviations occur in the actual rotation angle and the set rotation angle of the round billet in the furnace, and such deviations are accumulated and cannot be corrected, which affects the tracking accuracy of the position of the pipe billet in the furnace. Moreover, because there is no limitation of the trough, there is a possibility that the round billets may roll slightly during the heating process, thereby causing adjacent round billets within the furnace to come together or come very close together. Therefore, the steel drawing machine cannot identify the specific condition of the round billet waiting for steel tapping at present, so that the steel drawing control can be realized only by manual operation, and the labor cost is increased.
Aiming at the problems in the prior art, the novel automatic steel pumping system and method for the annular heating furnace are of great significance.
Disclosure of Invention
In order to solve the problems, the invention provides an automatic steel pumping system and method for an annular heating furnace, which can improve the automatic steel pumping capacity of the annular heating furnace and improve the production efficiency.
In order to achieve the purpose, the automatic steel drawing system of the annular heating furnace comprises an annular hearth and a furnace bottom, a steel loading area, a heating area and a steel tapping area are sequentially formed in the annular hearth along the rotation direction of the furnace bottom, the automatic steel drawing system comprises a PLC control unit, a steel drawing machine used for drawing a steel billet to be drawn out from the steel tapping area, a driving mechanism used for driving the furnace bottom to rotate, an image acquisition unit used for acquiring images of the steel tapping area and an image processing unit used for processing image signals acquired by the image acquisition unit, and the driving mechanism, the steel drawing machine, the image acquisition unit and the image processing unit are all connected with the PLC control unit.
Preferably, the image acquisition unit comprises a light source, an optical lens, an industrial camera and an image acquisition card.
Further, the industrial camera is a CCD or CMOS camera.
Preferably, the image processing unit is an industrial computer.
The automatic steel drawing method of the annular heating furnace based on the automatic steel drawing system of the annular heating furnace comprises the following steps:
s1, after the rotation of the furnace bottom is stopped, the driving mechanism sends a signal of stopping the rotation of the furnace bottom to the PLC control unit;
s2, the PLC control unit receives a signal sent by the driving mechanism and used for stopping the rotation of the furnace bottom, and sends an instruction for acquiring an image of the tapping area to the image acquisition unit;
s3, the image processing unit receives and processes the image signal acquired by the image acquisition unit, judges the position state of the billet to be pumped and the angle of the furnace bottom required to rotate, and sends the judgment result to the PLC control unit;
s4, the PLC control unit receives the judgment result sent by the image processing unit, and controls the driving mechanism or the steel drawing machine to act or give an alarm according to the judgment result;
wherein the position states include a first position state, a second position state, and a third position state; when the billet to be drawn is in the first position state, the billet to be drawn can be drawn by the steel drawing machine, and the PLC control unit controls the steel drawing machine to perform automatic steel drawing action; when the billet to be extracted is in the second position state, the billet to be extracted cannot be extracted by the steel extractor, the PLC control unit is required to control the driving mechanism to drive the furnace bottom to rotate, and S1-S4 are repeated; when the billet to be extracted is in the third position state, the billet to be extracted collides with the billet adjacent to the billet to be extracted, and the PLC control unit gives an alarm.
Preferably, a partition wall is arranged between the heating area and the tapping area, and the method for judging the position state of the billet to be tapped and the angle of the furnace bottom required to rotate comprises the following steps:
s31, calculating an included angle theta between the center line of the steel billet to be pumped and the center line of the steel tapping area1An included angle theta between the central line of the steel tapping area and the central line of the partition wall2And an included angle theta between the center line of the billet to be extracted and the center line of the billet adjacent to the billet to be extracted3；
S32, setting a maximum allowable deviation angle theta of the center line of the billet to be drawn deviating from the center line of the tapping area4The minimum angle theta allowed by the included angle between the steel billet to be extracted and the steel billet adjacent to the steel billet to be extracted5；
S33, according to theta1、θ2、θ3、θ4、θ5The following determinations are made:
if theta1≥θ2Judging that the billet to be pumped is in the second position state, wherein the angle of rotation of the furnace bottom is theta2；
If theta4≤θ1＜θ2Judging that the billet to be pumped is in the second position state, wherein the angle of rotation of the furnace bottom is theta1；
If theta1≤-θ4Judging that the billet to be pumped is in the second position state, wherein the angle of the furnace bottom needing to rotate is-theta1；
If-theta4＜θ1＜θ4And theta3＞θ5Judging that the billet to be pumped is in the first position state, wherein the rotation angle of the furnace bottom is 0;
if theta3≤θ5And judging that the billet to be pumped is in the third position state, wherein the required rotation angle of the furnace bottom is 0.
According to the automatic steel pumping system and method for the annular heating furnace, the image of the steel tapping area is collected through the image collecting unit, the image processing unit processes image signals, the position state of a steel billet to be pumped and the angle of the furnace bottom needing to rotate are judged, and the corresponding judgment result is sent to the PLC control unit, so that the PLC control unit controls the driving mechanism or the steel pumping machine to act or alarms, and therefore automatic steel pumping of the annular heating furnace is achieved, and the accuracy and the efficiency of steel pumping are improved.
Drawings
FIG. 1 is a schematic top view of the ring furnace of the present invention;
FIG. 2 is a schematic structural diagram of an automatic steel drawing system of the annular heating furnace of the invention;
FIG. 3 is a flow chart of the automatic steel extraction method of the annular heating furnace of the invention.
Detailed Description
The structure, operation, and the like of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 and 2, the annular heating furnace comprises an annular hearth and a furnace bottom, a steel loading area 1, a heating area 2 and a steel tapping area 3 are sequentially formed in the annular hearth along the rotation direction of the furnace bottom, the furnace bottom is used for distributing steel billets and is controlled to rotate by a driving mechanism 7, as shown in the arrow direction of fig. 1, the furnace bottom rotates clockwise, the steel billets are loaded into the steel loading area 1 by a steel loading machine, are heated by the heating area 2 under the rotation of the furnace bottom, reach the steel tapping area 3, and are pumped out by a steel pumping machine 9 and conveyed to a rolling production line. Wherein the upper part of the steel charging zone 1 and the upper part of the heating zone 2, the upper part of the heating zone 2 and the upper part of the steel tapping zone 3 and the upper part of the steel charging zone 1 are separated by partition walls 4, 5, 6, respectively. The driving mechanism 7 is a circular furnace hearth transmission device well known to those skilled in the art.
Referring to fig. 2, in order to improve the automatic steel drawing capability of the ring-shaped heating furnace and improve the production efficiency, the automatic steel drawing system of the ring-shaped heating furnace of the invention comprises a PLC control unit 8, a steel drawing machine 9 for drawing a steel billet to be drawn out from the steel tapping area 3, a driving mechanism 7 for driving the furnace bottom to rotate, an image acquisition unit 10 for acquiring an image of the steel tapping area 3, and an image processing unit 11 for processing an image signal acquired by the image acquisition unit 10, wherein the driving mechanism 7, the steel drawing machine 9, the image acquisition unit 10, and the image processing unit 11 are all connected with the PLC control unit 8.
The image acquisition unit 10 is arranged above the tapping area 3, and the range of acquiring the image can cover the whole area of the tapping area 3. The image acquisition unit 10 includes a light source, an optical lens, an industrial camera, and an image acquisition card. The light source is used to generate a suitable illumination to ensure that the acquired image of the tapped area 3 is of sufficient definition, the light emitted by the light source being shone on the entire area of the tapped area 3 and then received by the optical lens. The optical lens is installed on an industrial camera, the industrial camera generally adopts a CCD or CMOS camera, and the output end of the industrial camera is connected with an image acquisition card.
The image processing unit 11 is preferably an industrial computer, and has an input terminal connected to the output terminal of the image acquisition card and an output terminal connected to the input terminal of the PLC control unit 8.
Referring to fig. 3 in combination with fig. 2, based on the above automatic steel-extracting system of the annular heating furnace, the automatic steel-extracting method of the annular heating furnace of the present invention includes the following steps:
s1, after the rotation of the furnace bottom stops, a driving mechanism 7 sends a signal of stopping the rotation of the furnace bottom to a PLC control unit 8;
s2, the PLC control unit 8 receives a signal sent by the driving mechanism 7 and used for stopping the rotation of the furnace bottom, and sends an instruction for acquiring the image of the steel tapping area 3 to the image acquisition unit 10;
s3, after the image acquisition unit 10 acquires the image of the steel tapping area 3, the image processing unit 11 receives and processes the image signal acquired by the image acquisition unit 10, judges the position state of the steel billet to be pumped and the angle of the furnace bottom needing to rotate, and sends the judgment result to the PLC control unit 8;
s4, the PLC control unit 8 receives the judgment result sent by the image processing unit 11, and controls the driving mechanism 7 or the steel drawing machine 9 to act or give an alarm according to the judgment result;
the position states of the billet to be extracted comprise a first position state, a second position state and a third position state.
The steel blank to be drawn is set to a first position state, namely an included angle theta between a central line OB of the steel blank to be drawn and a central line OA of the steel tapping zone 3 mentioned below, wherein the position state of the steel blank to be drawn can be drawn by the steel drawing machine 91Is less than the maximum allowable deviation angle theta4And the billet to be extracted and the billet adjacent to the billet to be extracted do not collide or are not in a position state with a close distance. When the billet to be steel-extracted is in the first position state, the PLC control unit 8 can control the steel-extracting machine 9 to perform automatic steel-extracting action.
Setting the position state that the billet to be extracted cannot be extracted by the steel extractor 9 and the billet to be extracted can be extracted by the steel extractor 9 only by rotating the furnace bottom to be a second position state, namely, the later mentioned included angle theta between the billet to be extracted and the steel-tapping zone 3, or between the central line OB of the billet to be extracted and the central line OA of the steel-tapping zone 3 is not rotated1Is greater than the maximum allowable deviation angle theta4The position state of (2). When the billet to be extracted is in the second position state, the PLC control unit 8 is required to control the driving mechanism 7 to drive the furnace bottom to rotate, and S1-S4 are repeated after the furnace bottom stops rotating by a corresponding angle.
The position state where the billet to be extracted collides with the billet adjacent to the billet to be extracted or the distance between the billet to be extracted and the billet to be extracted is set as a third position state, that is, the position state where the billet to be extracted collides with the billet adjacent to the billet to be extracted or the position state where the billet to be extracted cannot be identified by the steel extractor 9 due to the close distance between the billet to be extracted and the billet adjacent to the billet to be extracted. When the billet to be extracted is in the third position state, the PLC control unit 8 gives an alarm to inform an operator to carry out manual confirmation and operation.
Specifically, referring to fig. 3 in combination with fig. 1, the method for determining the position state of the billet to be extracted and the required rotation angle of the furnace bottom includes the following steps:
s31, calculating an included angle theta between a center line OB of the billet to be drawn and a center line OA of the steel tapping area 31The angle theta between the centre line OA of the tapping zone 3 and the centre line OC of the partition wall 52And an included angle theta between the center line OB of the billet to be drawn and the center line OD of the billet adjacent to the billet to be drawn3(ii) a Is set up as the figure1, wherein the center line OA of the tapping zone 3 coincides with the x-axis, theta is shown in the figure2Greater than 0 degree, theta3Greater than 0 degrees; if the billet to be tapped rotates between the partition wall 5 and the central line OA of the tapping zone 3, theta1More than 0 degree, theta if the billet to be tapped rotates between the central line OA of the tapping zone 3 and the partition wall 61Less than 0 degree;
s32, setting a maximum allowable deviation angle theta of a central line OB of the billet to be drawn deviating from a central line OA of the steel tapping zone 34(ii) a An included angle theta between a central line OB of the billet to be extracted and a central line OD of the billet adjacent to the billet to be extracted3Minimum allowed angle theta5I.e. if theta3＞θ5If so, indicating that the billet to be extracted does not collide with the billet adjacent to the billet to be extracted or the distance is not very close; if theta3≤θ5If so, the collision or the distance between the billet to be extracted and the billet adjacent to the billet to be extracted is very close;
s33, according to theta1、θ2、θ3、θ4、θ5The following determinations are made:
if theta1≥θ2If the steel billet to be extracted does not rotate to the steel tapping area 3, the steel billet to be extracted is judged to be in the second position state, and the required rotation angle of the furnace bottom is theta2I.e. clockwise by theta2To make the billet to be extracted reach the tapping area 3;
if theta4≤θ1＜θ2Means that the billet to be tapped has rotated into the tapping zone 3 and is located between the partition wall 5 and the centre line of the tapping zone 3, but that the angle θ between the centre line OB of the billet to be tapped and the centre line OA of the tapping zone 3 is such that1Greater than the maximum allowable deviation angle theta4Then, the steel billet to be pumped is judged to be in the second position state, and the angle of the furnace bottom needing to rotate is theta1I.e. clockwise by theta1At such an angle theta that the angle between the centre line OB of the billet to be tapped and the centre line OA of the tapping zone 3 is such that1Less than the maximum allowable deviation angle theta4；
If theta1≤-θ4Indicating that the billet to be tapped has rotated to the tapping zone 3 and is located in the tapping zone 3Between the central line OA and the partition wall 6, in which case theta1Less than 0 degree and the included angle theta between the central line OB of the billet to be drawn and the central line OA of the tapping zone 31Is greater than the maximum allowable deviation angle theta4Then, the steel billet to be pumped is judged to be in the second position state, and the angle of the furnace bottom needing to rotate is-theta1I.e. counter-clockwise rotation by-theta1At such an angle theta that the angle between the centre line OB of the billet to be tapped and the centre line OA of the tapping zone 3 is such that1Is less than the maximum allowable deviation angle theta4；
If-theta4＜θ1＜θ4And theta3＞θ5The included angle theta between the central line OB of the billet to be tapped and the central line OA of the tapping zone 3 is shown when the billet to be tapped has rotated to the tapping zone 31Is less than the maximum allowable deviation angle theta4If the billet to be extracted does not collide with the billet adjacent to the billet to be extracted or the distance between the billet to be extracted and the billet to be extracted is not very close, the billet to be extracted is judged to be in the first position state, the rotation angle of the furnace bottom is 0, namely the furnace bottom does not need to be rotated, and the PLC control unit 8 directly sends a steel extracting instruction to the steel extractor 9;
if theta3≤θ5If the collision or the distance between the billet to be extracted and the billet adjacent to the billet to be extracted is very short, the billet to be extracted is judged to be in a third position state, the rotation angle of the furnace bottom is 0, namely, the furnace bottom does not need to be rotated, and the PLC control unit 8 directly gives an alarm to inform an operator to perform manual confirmation and operation.
The foregoing is merely illustrative of the present invention, and it will be appreciated by those skilled in the art that various modifications may be made without departing from the principles of the invention, and the scope of the invention is to be determined accordingly.
Claims (6)
1. The automatic steel drawing system of the annular heating furnace is characterized by comprising a PLC control unit, a steel drawing machine, a driving mechanism, an image acquisition unit and an image processing unit, wherein the steel drawing machine is used for drawing a steel blank to be drawn out from the steel tapping area; wherein,
the image processing unit processes the image signal, judges the position state of the billet to be pumped and the angle of the furnace bottom needing to rotate by extracting the outline of the billet image, and sends the corresponding judgment result to the PLC control unit.
2. The automatic steel drawing system of the annular heating furnace according to claim 1, wherein the image acquisition unit comprises a light source, an optical lens, an industrial camera, and an image acquisition card.
3. The automatic steel drawing system of the annular heating furnace according to claim 2, wherein the industrial camera is a CCD or CMOS camera.
4. The automatic steel drawing system of the annular heating furnace according to claim 1, wherein the image processing unit is an industrial computer.
5. An automatic steel drawing method of an annular heating furnace based on the automatic steel drawing system of the annular heating furnace according to claim 1, which is characterized by comprising the following steps:
s1, after the rotation of the furnace bottom is stopped, the driving mechanism sends a signal of stopping the rotation of the furnace bottom to the PLC control unit;
s2, the PLC control unit receives a signal sent by the driving mechanism and used for stopping the rotation of the furnace bottom, and sends an instruction for acquiring an image of the tapping area to the image acquisition unit;
s3, the image processing unit receives and processes the image signal acquired by the image acquisition unit, judges the position state of the billet to be pumped and the angle of the furnace bottom required to rotate, and sends the judgment result to the PLC control unit;
s4, the PLC control unit receives the judgment result sent by the image processing unit, and controls the driving mechanism or the steel drawing machine to act or give an alarm according to the judgment result;
wherein the position states include a first position state, a second position state, and a third position state; when the billet to be drawn is in the first position state, the billet to be drawn can be drawn by the steel drawing machine, and the PLC control unit controls the steel drawing machine to perform automatic steel drawing action; when the billet to be extracted is in the second position state, the billet to be extracted cannot be extracted by the steel extractor, the PLC control unit is required to control the driving mechanism to drive the furnace bottom to rotate, and S1-S4 are repeated; when the billet to be extracted is in the third position state, the billet to be extracted collides with the billet adjacent to the billet to be extracted, and the PLC control unit gives an alarm.
6. The automatic steel-drawing method of the circular heating furnace according to claim 5, wherein a partition wall is provided between the heating zone and the steel-tapping zone, and the method for judging the position state of the billet to be drawn and the angle at which the hearth needs to be rotated comprises the steps of:
s31, calculating an included angle theta between the center line of the steel billet to be pumped and the center line of the steel tapping area1An included angle theta between the central line of the steel tapping area and the central line of the partition wall2And an included angle theta between the center line of the billet to be extracted and the center line of the billet adjacent to the billet to be extracted3；
S32, setting a maximum allowable deviation angle theta of the center line of the billet to be drawn deviating from the center line of the tapping area4The minimum angle theta allowed by the included angle between the steel billet to be extracted and the steel billet adjacent to the steel billet to be extracted5；
S33, according to theta1、θ2、θ3、θ4、θ5The following determinations are made:
if theta1≥θ2Judging that the billet to be pumped is in the second position state, wherein the angle of rotation of the furnace bottom is theta2；
If theta4≤θ1＜θ2Judging that the billet to be pumped is in the second position state, wherein the angle of rotation of the furnace bottom is theta1；
If theta1≤-θ4Judging that the billet to be pumped is in the second position state, wherein the angle of the furnace bottom needing to rotate is-theta1；
If-theta4＜θ1＜θ4And theta3＞θ5Judging that the billet to be pumped is in the first position state, wherein the rotation angle of the furnace bottom is 0;
if theta3≤θ5And judging that the billet to be pumped is in the third position state, wherein the required rotation angle of the furnace bottom is 0.
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