CN116000107A - Method for automatically judging tail folding and automatically shearing by hot continuous rolling - Google Patents
Method for automatically judging tail folding and automatically shearing by hot continuous rolling Download PDFInfo
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- CN116000107A CN116000107A CN202211646359.7A CN202211646359A CN116000107A CN 116000107 A CN116000107 A CN 116000107A CN 202211646359 A CN202211646359 A CN 202211646359A CN 116000107 A CN116000107 A CN 116000107A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a method for automatically judging tail folding and automatic shearing by hot continuous rolling, which comprises the steps of determining whether a tail opening pin stretches into the limit position of the inside of a steel coil according to a proximity switch; if the proximity switch determines that the tail opening pin stretches into the limit position in the steel coil, the tail of the strip steel is retracted through the tail opening pin after passing through the pinch roll, and then the flying shear shears the tail of the strip steel to finish shearing; if the proximity switch determines that the tail pin cannot extend into the limit position in the steel coil, the flying shears shear the uncoiled part of the strip steel, and the tail pin retracts after the uncoiled part of the strip steel stops moving, so that the shearing is completed. According to the invention, only one proximity switch is additionally arranged in the original equipment of the hot rolling mill, and the state that the tail pin stretches into the steel coil is judged through the proximity switch, so that the generation of strip steel tail lap rolling can be effectively avoided, and double-layer strip steel is prevented from entering a finish rolling mill; important equipment such as a working roller, a connecting shaft and the like are effectively protected, the occurrence probability of accidents is reduced, and smooth production is ensured.
Description
Technical Field
The invention relates to the technical field of strip steel production, in particular to a method for automatically judging tail folding and automatically shearing by hot continuous rolling.
Background
In the hot continuous rolling production process, a plate blank is rolled by a heating furnace and rough rolling and then reaches a hot coil box, a steel coil is coiled by the hot coil box and then uncoiled, and strip steel is subjected to flying shear and finish rolling to an underground coiling machine.
Under normal conditions, the hot rolling box is uncoiled after the hot rolling box has uncoiling conditions, the 2D roller and the tail-cutting roller rotate to drive the strip steel to advance, the production control flow is shown in the figure 1, the head of the strip steel enters the upper pinch roller and the lower pinch roller, the roll gap between the upper pinch roller and the lower pinch roller is immediately positioned to the thickness value (the error is plus or minus 2 mm) of the strip steel, the strip steel enters the finishing mill through the flying shears under the driving of the upper pinch roller and the lower pinch roller, and the hot rolling box is normally uncoiled. When the diameter of the steel coil in the hot coil box reaches the set data (last circle), the tail opening pin penetrates into the coil to help to open the tail of the steel coil, under the action of the tail opening pin, the last circle of steel coil is opened to enter the upper pinch roll and the lower pinch roll, the tail opening pin is retracted to the initial position, the irregular shape of the tail part of the strip steel is sheared off, and the tail part enters the finish rolling mill.
In the production process, the tail pin fails (or does not stretch into place), the steel coil at the top of the last circle falls under the action of gravity and the tension of the pinch roll, so that the upper layer and the lower layer of the steel coil are extruded by the tail-separating roll and the upper pinch roll and the lower pinch roll, the two layers of the steel coil are stacked together, the pinch rolls are forced to be extruded (in the vertical direction up and down) under any instruction of a PLC (programmable logic controller), and when an operator does not confirm, the two layers of strip steel enter the flying shears to cause the break of the shearing edges, and after entering the finish rolling F1 rolling mill, important equipment such as a working roll, a connecting shaft and the like are directly damaged.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for automatically judging tail folding and automatically shearing by hot continuous rolling, which comprises the following steps of,
determining whether the tail pin stretches into the limit position in the steel coil according to the proximity switch;
if the proximity switch determines that the tail opening pin stretches into the limit position in the steel coil, the tail of the strip steel is retracted through the tail opening pin after passing through the pinch roll, and then the flying shear shears the tail of the strip steel to finish shearing;
if the proximity switch determines that the tail pin cannot extend into the limit position in the steel coil, the flying shears shear the uncoiled part of the strip steel, and the tail pin retracts after the uncoiled part of the strip steel stops moving, so that the shearing is completed.
Further, when the proximity switch fails and the roll gap of the pinch roll is abnormally increased,
the flying shears shear the uncoiled part of the strip steel, and after the uncoiled part of the strip steel stops moving, the cotter pin retracts to finish shearing.
Further, the proximity switch fails to be the limit position that the proximity switch always detects that the cotter pin stretches into the steel coil.
Further, before the flying shear shears the part of the strip steel which is not uncoiled, alarming and reminding are further included.
Further, a proximity switch is installed at the action of the end opening pin extending into the limit position of the center of the steel coil.
Further, the uncoiling coil diameter of the steel coil is smaller than or equal to 900mm.
Further, the method comprises the step of stopping the movement of the sheared strip steel after the shearing is completed, and the other end of the tail part of the strip steel enters a rolling mill.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, only one proximity switch is additionally arranged in original equipment of a hot rolling mill, the state that the tail opening pin stretches into the steel coil is judged through the proximity switch, the state that the tail opening pin stretches into the steel coil is determined according to the proximity switch, if the tail opening pin stretches into the steel coil abnormally, the flying shear action is timely caused by judging the abnormality of the roll gap value of the pinch roll, the generation of strip steel tail lap rolling can be effectively avoided, and double-layer strip steel is prevented from entering a finish rolling mill; if the proximity switch fails, the flying shears shear the unreeled part of the strip steel, and the tail pin retracts after the unreeled part of the strip steel stops moving, so that important equipment such as a working roller, a connecting shaft and the like are effectively protected, the occurrence probability of accidents is reduced, and the smooth production is ensured.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the process or flow particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a flow chart of strip tail shear under normal production control;
FIG. 2 shows a schematic cross-sectional view of strip tail shear under normal production control;
FIG. 3 shows a schematic cross-sectional view of a strip steel stack under rolling;
fig. 4 shows a flowchart of a method for automatically determining tail folding and automatic shearing by hot continuous rolling in an embodiment of the invention.
Detailed Description
Normal hot rolling production as shown in fig. 2, when the diameter of a coil in a hot coil box is detected to reach set data (the last turn), a tail opening pin goes deep into the coil to help to open the tail of the coil, under the action of the tail opening pin, the last turn of the coil is opened to enter an upper pinch roll and a lower pinch roll, the tail opening pin is retracted to an initial position, the tail of the strip steel is sheared off in an irregular shape, and the tail enters an F1 rolling mill. In the production process, the 2D roller and the tail opening roller are always in a tangential state with the steel coil, the steel coil is changed from large to small, so that the position of the center of the steel coil is continuously changed, and in the last circle, the tail opening pin must be inserted into the center of the steel coil to the limit position, so that the tail part can be ensured not to drop down due to gravity and the pulling force of the pinch roller to cause the rolling.
As shown in fig. 3, if the tail pin is abnormal or cannot extend into the center of the steel coil to the limit position, the tail part of the strip steel can form lap rolling due to the influence of gravity and the tension of the pinch rolls. The two layers of strip steel enter the flying shears to cause the break of the shearing blades, and after entering the finish rolling F1 rolling mill, important equipment such as working rolls, connecting shafts and the like are directly damaged.
Therefore, the invention installs the proximity switch at the action position of the end opening pin extending into the limit position of the center of the steel coil, and judges whether the end opening pin reaches the limit position of the center of the steel coil or not through the proximity switch. And also provides a corresponding tail shearing method when the proximity switch fails.
The invention provides a method for automatically judging tail folding and automatically shearing by hot continuous rolling, which comprises the following steps of,
determining whether the tail pin stretches into the limit position in the steel coil according to the proximity switch;
if the proximity switch determines that the tail opening pin stretches into the limit position in the steel coil, the tail of the strip steel is retracted through the tail opening pin after passing through the pinch roll, and then the flying shear shears the tail of the strip steel to finish shearing;
if the proximity switch determines that the tail pin cannot extend into the limit position in the steel coil, the flying shears shear the uncoiled part of the strip steel, and the tail pin retracts after the uncoiled part of the strip steel stops moving, so that the shearing is completed.
In the embodiment of the invention, a proximity switch is arranged at the action position of the end opening pin extending into the limit position of the center of the steel coil, and whether the end opening pin reaches the limit position of the center of the steel coil is judged by the proximity switch.
In the embodiment of the invention, when the proximity switch fails and the pinch roll gap is abnormally increased, the flying shears shear shears the uncoiled part of the strip steel, and after the uncoiled part of the strip steel stops moving, the cotter pin retracts to finish shearing. The approach switch fails to detect the limit position of the tail pin extending into the steel coil all the time.
In the embodiment of the invention, the uncoiling diameter of the steel coil is less than or equal to 900mm.
In the embodiment of the invention, before the flying shear shears the unreeled part of the strip steel, alarming and reminding are further included. The alarm reminding can alarm on a picture of a human-machine interaction interface (HMI) or can carry out sound-light alarm in an operation room so as to prompt an operator that the tail part of the strip steel has the problem of rolling.
In an embodiment of the invention, the sheared strip passes through a rolling mill. And after the shearing is finished, the sheared strip steel stops moving, and the other end of the tail part of the strip steel passes through a rolling mill.
The following description of specific embodiments of the present invention and the accompanying drawings will provide a clear and complete description of the technical solutions of embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 4, in one embodiment of the present invention, taking a certain hot rolling mill as an example, a proximity switch is installed at the operation of a hot coil box at the limit position where a cotter pin extends into the center of a steel coil, a method for automatically determining tail folding and automatic cutting by hot continuous rolling comprises the steps of,
a. the head of the strip steel passes through an upper pinch roll and a lower pinch roll, the roll gap between the upper pinch roll and the lower pinch roll is immediately positioned to the thickness value (the error is plus or minus 2 mm), the strip steel enters a finishing mill through a flying shear under the driving of the upper pinch roll and the lower pinch roll, and the hot coil box is normally uncoiled and uncoiled, and the coil diameter is less than or equal to 900mm; when the diameter of the steel coil of the hot coil box reaches the set data, the strip steel is indicated to be curled to the tail;
b. the tail opening pin stretches into the steel coil, and the tail opening pin normally stretches into the steel coil and the tail opening pin abnormally stretches into the steel coil according to the proximity switch, wherein whether the tail opening pin normally or abnormally reaches the limit position of the center of the steel coil or not is defined as whether the tail opening pin normally or abnormally reaches the limit position of the center of the steel coil or not;
b1, detecting abnormality of failure of a proximity switch until detecting that a tail pin stretches into the limit position in the steel coil and the roll gap of a pinch roll is abnormally increased, and entering the steps c-g;
b2, determining that the tail pin cannot extend into the limit position of the steel coil by the proximity switch, and entering the steps c-g;
b3, the proximity switch determines the limit position of the tail pin extending into the steel coil, and then the step h-j is carried out;
c. the tail part is determined to be rolled, an alarm is given on an HMI picture, and an audible and visual alarm is given in an operation room;
d. the flying shears are started immediately to shear the rolled strip steel, so that the double-layer strip steel is prevented from entering an F1 finish rolling mill;
e. the 2D roller, the upper pinch roller, the lower pinch roller and the tail-separating roller stop working;
f. the cotter pin is retracted to an initial position, and cutting is completed;
g. the 2D roller, the upper pinch roller, the lower pinch roller and the tail-cutting roller stop working, so that the sheared strip steel stops moving, and the other end of the tail part of the strip steel is driven to enter an F1 finish rolling mill;
h. the tail part of the strip steel passes through an upper pinch roll and a lower pinch roll;
i. the cotter pin is retracted to an initial position;
j. the flying shears cut off the tail of the irregular strip steel, and the shearing is completed, and the sheared strip steel stops moving due to the stop of the 2D roller, the upper pinch roller, the lower pinch roller and the tail cutting roller, and the other end of the tail of the strip steel is driven to enter the F1 finish rolling mill.
In this embodiment, there are three cases. Case 1: the approach switch fails to detect abnormality (the limit position that the tail pin stretches into the steel coil is always detected), the roll gap value between the upper pinch roll and the lower pinch roll is periodically scanned, and once the gap between the upper pinch roll and the set value is found to be too large, the tail part of the strip steel is indicated to be already rolled. Case 2: when the proximity switch is normal, the proximity switch determines that the tail pin cannot extend into the limit position in the steel coil, and no matter whether the roll gap value between the upper pinch roll and the lower pinch roll is normal or not, the tail part is likely to have the risk of rolling under the tension force of the pinch roll and the self gravity. In both cases, the flying shears cut off the strip steel immediately, avoiding the double-layer strip steel from entering the finish rolling mill; then the 2D roller, the upper pinch roller, the lower pinch roller and the tail-separating roller stop working, and the tail-separating pin is retracted to the initial position. Case 3: the proximity switch determines the limit position of the tail pin extending into the steel coil, so that the production can be normally carried out.
In summary, the invention adds only one proximity switch in the original equipment of the hot rolling mill, judges the state that the cotter pin stretches into the steel coil through the proximity switch, and determines the state that the cotter pin stretches into the steel coil according to the proximity switch, if the cotter pin stretches into the steel coil abnormally, the flying shear action is timely caused by judging the abnormality of the roll gap value of the pinch roll, thereby effectively avoiding the generation of strip steel tail lap rolling and avoiding the double-layer strip steel from entering the finish rolling mill; if the proximity switch fails, the flying shears shear the unreeled part of the strip steel, and the tail pin retracts after the unreeled part of the strip steel stops moving, so that important equipment such as a working roller, a connecting shaft and the like are effectively protected, the occurrence probability of accidents is reduced, and the smooth production is ensured.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (7)
1. A method for automatically judging tail folding and automatically cutting by hot continuous rolling is characterized by comprising the following steps of,
determining whether the tail pin stretches into the limit position in the steel coil according to the proximity switch;
if the proximity switch determines that the tail opening pin stretches into the limit position in the steel coil, the tail of the strip steel is retracted through the tail opening pin after passing through the pinch roll, and then the flying shear shears the tail of the strip steel to finish shearing;
if the proximity switch determines that the tail pin cannot extend into the limit position in the steel coil, the flying shears shear the uncoiled part of the strip steel, and the tail pin retracts after the uncoiled part of the strip steel stops moving, so that the shearing is completed.
2. The method of claim 1, further comprising, when the proximity switch fails and the pinch roll gap increases abnormally,
the flying shears shear the uncoiled part of the strip steel, and after the uncoiled part of the strip steel stops moving, the cotter pin retracts to finish shearing.
3. The method of claim 2, wherein the proximity switch failure is the proximity switch detecting a limit position of the extension of the cotter pin into the interior of the coil.
4. The method of claim 1 or 2, wherein the flying shears further comprise alerting before shearing the unreeled portion of the strip.
5. The method of claim 1, wherein the proximity switch is installed at the action of the end pin extending into the extreme position of the center of the coil.
6. The method of claim 1, wherein the coil has an uncoiling diameter of 900mm or less.
7. The method of claim 1 or 2, wherein the shearing is completed further comprising stopping the sheared strip, and wherein the other end of the strip tail enters the rolling mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211646359.7A CN116000107A (en) | 2022-12-20 | 2022-12-20 | Method for automatically judging tail folding and automatically shearing by hot continuous rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211646359.7A CN116000107A (en) | 2022-12-20 | 2022-12-20 | Method for automatically judging tail folding and automatically shearing by hot continuous rolling |
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| Publication Number | Publication Date |
|---|---|
| CN116000107A true CN116000107A (en) | 2023-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211646359.7A Pending CN116000107A (en) | 2022-12-20 | 2022-12-20 | Method for automatically judging tail folding and automatically shearing by hot continuous rolling |
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- 2022-12-20 CN CN202211646359.7A patent/CN116000107A/en active Pending
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