CN111957915A - Self-adaptive control device for side sealing plates of double-roller thin-strip continuous casting roller - Google Patents
Self-adaptive control device for side sealing plates of double-roller thin-strip continuous casting roller Download PDFInfo
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- CN111957915A CN111957915A CN202010947866.9A CN202010947866A CN111957915A CN 111957915 A CN111957915 A CN 111957915A CN 202010947866 A CN202010947866 A CN 202010947866A CN 111957915 A CN111957915 A CN 111957915A
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- side sealing
- sealing plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/168—Controlling or regulating processes or operations for adjusting the mould size or mould taper
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Abstract
The invention provides a novel control method for vibration of a double-roller thin-strip continuous casting roller side sealing plate. The self-adaptive vibration control equipment of the side sealing plates comprises the side sealing plates, a four-bar mechanism, a hydraulic cylinder, a servo valve, a displacement sensor, a proximity switch, a pressure sensor, a Programmable Logic Controller (PLC), a human-machine interface (HMI) and the like. In the continuous casting process, two casting rolls and two side sealing plates positioned on the end surfaces of the casting rolls form a molten pool, molten steel is injected, and the molten steel is condensed into strip steel through the rotation and cooling of the casting rolls and is sent out of the molten pool. Through the reciprocating motion of the side sealing plates, molten steel on the end surfaces of the casting rolls and condensed strip steel are flapped, the coagulation quality of the strip steel can be improved through the vibration force generated by the flapping, the gap between the side sealing plates and the end surfaces of the casting rolls is ensured through self-adaptive control, the friction between the side sealing plates and the end surfaces of the casting rolls is reduced, and the service life of the casting rolls and the side sealing plates is prolonged.
Description
Technical Field
The invention relates to the field of strip continuous casting, in particular to self-adaptive vibration control of side sealing plates of a twin-roll strip continuous casting roll.
Background
At present, the domestic twin-roll thin-strip continuous casting roll side sealing plate is usually fixed, namely the side sealing plate is adjusted to a set position and then locked according to process requirements before casting. After the casting is started, the end face of the casting roll can be heated to expand, the side sealing plates can also expand and deform after being heated, the side sealing plates can be in contact with the end face of the casting roll, the casting roll rotates to wear, the side sealing plates can be damaged, the end face of the casting roll can also be worn, the service cycle of the side sealing plates and the casting roll is influenced, and meanwhile edge cracks can be generated on the edge of a casting strip to influence the product quality.
Disclosure of Invention
The invention mainly changes the working mode of the side sealing plate from fixed type to movable type and has self-adaptive control. The main equipment comprises: the side sealing plate, the four-bar mechanism, the hydraulic cylinder, the servo valve, the displacement sensor, the pressure sensor, the proximity switch, the programmable controller, the human-computer interface and the like. During casting, the PLC pushes the side sealing plates to reciprocate through the servo valve, the hydraulic cylinder and the four-bar mechanism according to set requirements to form vibration.
The technical means of the invention are as follows:
when the side sealing plate is in normal operation, the programmable logic controller PLC calculates a real-time amplitude set value according to the frequency, the amplitude and the waveform set by the HMI, then the real-time amplitude set value is compared with an actual detection value, the difference value passes through the proportional-integral-derivative PID regulator, the regulator outputs a set value used as the opening degree of the servo valve, the extending position of a piston of the hydraulic cylinder, namely the position of the side sealing plate, is controlled, and the side sealing plate can move back and forth according to the set waveform, the frequency and the. And comparing the thrust of the side sealing plates in real time, judging the contact condition of the side sealing plates and the end surfaces of the casting rolls, and adjusting the gaps between the side sealing plates and the end surfaces of the casting rolls so that the contact force of the side sealing plates and the end surfaces of the casting rolls is smaller than a set value.
Compared with the prior art, the invention has the following advantages:
1. the control mode provided by the invention can reduce the abrasion of the side sealing plates and the casting rolls, prolong the service life of equipment and reduce the use cost of the equipment.
2. The control mode provided by the invention can improve the internal solidification quality of the strip steel, reduce the edge crack of the cast strip and improve the quality of the finished product of the strip steel.
Through perfect data accumulation, the product quality and the production efficiency can be improved aiming at different product curing vibration processes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the control connection relationship of the present invention.
FIG. 2 is a control function block diagram of the present invention.
FIG. 3 is a schematic view of a twin roll strip casting roll and side closure plates according to the present invention.
In the figure: 1. a side sealing plate; 2. a four-bar linkage; 3. a hydraulic cylinder; 4. a displacement sensor; 5. a pressure sensor; 6. a servo valve; 7. a programmable logic controller PLC; 8. and a human-machine interface HMI.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "upper, lower, left, right", "parallel, vertical", etc., are generally based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be taken as limiting the scope of the present invention.
As shown in fig. 1 to 3, the present invention provides a new method for controlling the vibration of the side sealing plates of the twin roll strip casting roll. The self-adaptive vibration control equipment of the side sealing plates comprises the side sealing plates, a four-bar mechanism, a hydraulic cylinder, a servo valve, a displacement sensor, a proximity switch, a pressure sensor, a Programmable Logic Controller (PLC), a human-machine interface (HMI) and the like. In the continuous casting process, two casting rolls and two side sealing plates positioned on the end surfaces of the casting rolls form a molten pool, molten steel is injected, and the molten steel is condensed into strip steel through the rotation and cooling of the casting rolls and is sent out of the molten pool. Through the reciprocating motion of the side sealing plates, molten steel on the end surfaces of the casting rolls and condensed strip steel are flapped, the coagulation quality of the strip steel can be improved through the vibration force generated by the flapping, the gap between the side sealing plates and the end surfaces of the casting rolls is ensured through self-adaptive control, the friction between the side sealing plates and the end surfaces of the casting rolls is reduced, and the service life of the casting rolls and the side sealing plates is prolonged.
As shown in fig. 1, the self-adaptive control equipment for side seal plates of the present invention mainly includes a side seal plate 1, a four-bar linkage 2 connected to the side seal plate 1, a hydraulic cylinder 3, a displacement sensor 4 in the hydraulic cylinder, a pressure sensor 5 on a hydraulic pipeline, a servo valve 6 for controlling the movement of the hydraulic cylinder, a programmable controller PLC7, and a human-computer interface 8.
The control function is as shown in figure 2, and the vibration waveform, frequency, amplitude and pressure protection value of the side sealing plate are set through a human-machine interface HMI 8; and the programmable controller PLC7 completes zero point calibration of the position measurement of the side sealing plate before casting.
After the side sealing plates are started to vibrate, the programmable controller PLC7 calculates the position set value of the side sealing plate 1 in each operation period of the programmable controller PLC7 according to the setting of the human-computer interface 8; the actual value of the displacement sensor 4 in the hydraulic cylinder is read and converted into the actual position value of the side seal plate 1.
The programmable controller PLC7 calculates the deviation between the set position and the actual position value as the set value of the PID regulator, the output of the PID regulator is used as the set value of the servo valve 6, the opening degree of the servo valve 6 is adjusted, namely the flow of the hydraulic oil in the hydraulic cylinder 3 is adjusted, and the stroke of the side sealing plate is controlled.
Because programmable controller PLC7 calculates side seal board 1 according to wave form, frequency, amplitude settlement position, the calculated value of every cycle all is different, and servo valve 6 aperture adjusts in real time for side seal board 1 adjusts the actual position according to the setting value, forms the vibration promptly.
After casting begins, the casting roll and the side sealing plates are heated and expand to a certain extent, so that the end faces of the casting roll are in contact with the side sealing plates 1, if the deformation is large, the stroke of the side sealing plates cannot reach a set position, the opening degree of the servo valve 6 is increased by the programmable logic controller PLC7 through a PID (proportion integration differentiation) regulator, the flow is increased, and meanwhile, the contact force between the side sealing plates 1 and the end faces of the casting roll is also increased. As the casting rolls are rotated, the pressure exerted by side seal plates 1 increases, which increases friction. The increase of the friction force can increase the abrasion of the side sealing plates and the end surfaces of the casting rolls. At this time, the PLC7 compares the actual pressure through the pressure sensor 5 on the hydraulic line with the pressure protection value set by the human-machine interface 8, and if the actual pressure measurement value exceeds the set value, adjusts the zero calibration value of the side seal plates 1, and increases the gap between the side seal plates 1 and the end surfaces of the casting rolls until the contact pressure between the side seal plates 1 and the end surfaces of the casting rolls is less than the pressure protection value set by the human-machine interface 8. Through the adjustment, when the side sealing plates 1 and the casting rolls are heated and deformed, the vibration positions of the side sealing plates are automatically adjusted, the friction between the side sealing plates 1 and the end surfaces of the casting rolls is avoided or reduced, and the service life of the side sealing plates 1 and the service life of the casting rolls are prolonged.
The frequency, the amplitude, the waveform and the pressure protection value can be conveniently and quickly set or adjusted through the human-computer interface 8, related data records during normal work are recorded, and the optimal setting scheme is stored, so that the production of subsequent identical or similar products is facilitated, and the labor intensity of operators is reduced.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A self-adaptive control device for side sealing plates of a twin-roll strip casting roll, comprising: the device comprises a casting roll side sealing plate (1), a four-bar mechanism (2) connected with the casting roll side sealing plate (1), a hydraulic cylinder (3), a displacement sensor (4), a pressure sensor (5), a servo valve (6), a Programmable Logic Controller (PLC) (7) and a human-machine interface (HMI) (8).
2. The self-adaptive control apparatus for side sealing plates of twin roll strip casting rolls according to claim 1,
the human-computer interface HMI (8) is provided with a vibration frequency of 1-20 Hz, an amplitude of 0.15-0.25 mm, a vibration waveform of sine wave or asymmetric sine wave and a pressure protection value, and the human-computer interface HMI (8) transmits a set value to the programmable controller PLC (7).
3. The self-adaptive control apparatus for side sealing plates of twin roll strip casting rolls according to claim 1,
the programmable controller PLC (7) calibrates the vibration zero position of the sealing plate in the following way: manually operating the side sealing plate to move forwards to enable the side sealing plate to abut against the end face of the casting roll, reading the numerical value of the displacement sensor (4) when the pressure value detected by the pressure sensor (5) reaches a set value, and then subtracting the clearance required by the side sealing plate and the end face of the casting roll in normal operation and the amplitude value set in a human-computer interface HMI (8) to be used as the zero point position of vibration of the side sealing plate;
calibration zero values sensor readings sensor accuracy gap values amplitude values.
4. The adaptive control of the twin roll strip casting roll side sealing plates of claim 1,
the programmable logic controllers (7) generate side sealing plate set positions with the operation period of 1-5 ms for each programmable logic controller (7) according to the waveform, the frequency and the amplitude preset by the human-computer interface HMI (8);
angle calculation of the current operation period of the programmable controller PLC (7):
yn represents the angle of the current operation period of the programmable logic controller PLC (7); yn-1 represents the angle of the last operation period of the programmable controller PLC (7); TA represents the running period of the programmable controller PLC (7); t represents a vibration period calculated from a set frequency
If the waveform preset by the human-computer interface HMI (8) is a sine wave, the set position L of the side sealing plate is as follows:
L＝F*sin(Yn)
f represents the set position of the current operation cycle of the programmable logic controller PLC (7), namely the set position of the side seal plate; f represents the preset amplitude of the human-machine interface HMI (8); yn represents the angle of the current operation period of the programmable controller PLC (7).
5. The adaptive control of the twin roll strip casting roll side sealing plates of claim 1,
the programmable controller PLC (7) reads the value of the side seal displacement sensor (4) at each period, compares the value with the set position value of the side seal plate, calculates the difference value,
Δ ═ set position value- (sensor measurements accuracy — calibration zero value);
and calculating the opening degree set value of the servo valve (6) by the difference value through a proportional-integral-derivative regulator.
6. The adaptive control of the side sealing plates of the twin roll strip casting rolls according to claim 1, wherein the servo valves (6) adjust the degree of opening and thus the stroke of the piston rods of the hydraulic cylinders (3) according to the set values of a programmable controller PLC (7).
7. The adaptive control of the twin roll strip casting roll side sealing plates of claim 1,
the piston rod of the hydraulic cylinder (3) is connected with one end of the four-bar mechanism (2), the casting roll side sealing plate (1) is connected with the other end of the four-bar mechanism (2), and when the piston rod of the hydraulic cylinder (3) changes, the casting roll side sealing plate (1) is driven by the four-bar mechanism (2) to change along with the piston rod of the hydraulic cylinder.
When the opening degree of the servo valve (6) is adjusted by the programmable logic controller PLC (7) according to the waveform and the amplitude set by the human-computer interface HMI (8), the hydraulic cylinder (3) reciprocates according to the waveform and the amplitude set by the human-computer interface HMI (8), and the casting roll side sealing plate (1) reciprocates according to the waveform and the amplitude set by the human-computer interface HMI (8), so that the vibration control of the casting roll side sealing plate (1) is formed.
8. The adaptive control of the twin roll strip casting roll side sealing plates of claim 1,
the programmable logic controller PLC (7) acquires the thrust of the casting roll side sealing plate (1) through the pressure sensor (5), and compares the thrust with a thrust protection value preset by the human-computer interface HMI (8);
when the thrust is less than or equal to a thrust protection value preset by the human-computer interface HMI (8), the fact that the casting roll side sealing plates (1) are not in contact with the end faces of the casting rolls or the contact strength does not exceed a set requirement is shown, and a calibration zero value is not adjusted; when the thrust force value is larger than a preset thrust force protection value, the contact strength of the casting roll side sealing plates (1) and the end surfaces of the casting rolls exceeds a set value, and the programmable logic controller PLC (7) adjusts the vibration calibration zero point position of the side sealing plates, so that the gap between the maximum vibration stroke of the casting roll side sealing plates (1) and the end surfaces of the casting rolls is enlarged, and the contact between the casting roll side sealing plates (1) and the end surfaces of the casting rolls is reduced.
Through avoiding casting roller side seal board (1) surpasss the setting value with the contact force of casting roller terminal surface, realizes the self-adaptation of casting roller side seal board (1) vibration reduces the friction, protects side seal board and casting roller terminal surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010947866.9A CN111957915A (en) | 2020-09-10 | 2020-09-10 | Self-adaptive control device for side sealing plates of double-roller thin-strip continuous casting roller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010947866.9A CN111957915A (en) | 2020-09-10 | 2020-09-10 | Self-adaptive control device for side sealing plates of double-roller thin-strip continuous casting roller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945164A (en) * | 2021-03-22 | 2021-06-11 | 中国长江电力股份有限公司 | Rapid calibration device for ceramic piston rod openness instrument and use method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112945164A (en) * | 2021-03-22 | 2021-06-11 | 中国长江电力股份有限公司 | Rapid calibration device for ceramic piston rod openness instrument and use method |
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