CN108114992B - A kind of anti-tear control device, planisher and control method - Google Patents
A kind of anti-tear control device, planisher and control method Download PDFInfo
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- CN108114992B CN108114992B CN201810044753.0A CN201810044753A CN108114992B CN 108114992 B CN108114992 B CN 108114992B CN 201810044753 A CN201810044753 A CN 201810044753A CN 108114992 B CN108114992 B CN 108114992B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 25
- 238000003825 pressing Methods 0.000 claims description 73
- 230000006835 compression Effects 0.000 claims description 49
- 238000007906 compression Methods 0.000 claims description 49
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 abstract description 37
- 239000010959 steel Substances 0.000 abstract description 37
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000000881 depressing effect Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 10
- 238000005096 rolling process Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 3
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- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 108050006002 RNA polymerase sigma factor FliA Proteins 0.000 description 1
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- 238000004364 calculation method Methods 0.000 description 1
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- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000007639 printing Methods 0.000 description 1
- 238000004886 process control 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
- B21B37/48—Tension control; Compression control
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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Abstract
The embodiment of the invention provides a kind of anti-tear control device, planisher and control method, anti-tear control device includes: telescopic oil cylinder, auxiliary pressure arm, rotary shaft, pressure arm, pressure roller and control device；Telescopic oil cylinder is also electrically connected with control device, and telescopic oil cylinder is provided with telescopic arm and rotating support shaft；Telescopic arm is connected with one end of auxiliary pressure arm；The other end and one end of pressure arm for assisting pressure arm are connected with rotary shaft, are preset with the first angle between auxiliary pressure arm and pressure arm, rotating shaft center respectively with the second angle is preset between the line at coiled sheet center and rotating support shaft center；The other end of pressure arm is connected with pressure roller；Control device is according to the distance between outer surface of the coil diameter of coiled sheet, the outer surface of pressure roller and coiled sheet, device parameter and measurement parameter, obtain control parameter, and then according to obtained control parameter, control signal is sent to telescopic oil cylinder, the depressing position for controlling pressure roller can solve the problems, such as to tear in cold rolled strip steel production process tabularium.
Description
Technical Field
The invention relates to the field of machining, in particular to an anti-tear control device, a temper mill and a control method.
Background
In the production process of the cold-rolled strip steel, when the steel coil in the bell-type furnace begins to be cooled, the outer layer of the steel coil is rapidly cooled and contracted, and the temperature of the inner layer exceeds 600 ℃, so that very high radial pressure is generated in the steel coil, and bonding is generated among the steel coil layers under the action of high temperature and high pressure for several hours. Due to the action of the adhesive force, the uncoiling expansion point deviates from the tangent point, the expansion angle is increased along with the reduction of the coil diameter, the instantaneous normal tearing force of the steel strip is far greater than the strength limit of the strip steel at the adhesive point, so that the steel strip is often torn or cracked during uncoiling, the tension fluctuation is caused, the leveling quality of the steel strip is seriously influenced, and the high-speed leveling thin strip is particularly obvious.
Disclosure of Invention
The embodiment of the invention provides an anti-tearing control device, a temper mill and a control method, which aim to solve the problem of tearing or fracture of a plate strip in the production process of cold-rolled strip steel.
In order to solve the above technical problem, according to an aspect of an embodiment of the present invention, there is provided a tear prevention control device including: the device comprises a telescopic oil cylinder, an auxiliary pressure arm, a rotating shaft, a pressure arm, a compression roller and a control device;
the telescopic oil cylinder is electrically connected with the control device and is provided with a telescopic arm and a rotary supporting shaft;
the telescopic arm is connected with one end of the auxiliary pressure arm;
the other end of the auxiliary pressure arm and one end of the pressure arm are both connected with the rotating shaft, a first included angle is preset between the auxiliary pressure arm and the pressure arm, and a second included angle is preset between the center of the rotating shaft and a connecting line of the center of a plate coil to be rolled and the center of the rotating support shaft;
the other end of the pressing arm is connected with the pressing roller;
the control device is used for acquiring the coil diameter of a plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil, device parameters and measurement parameters; wherein the device parameters include: the length of the pressing arm, the radius or the diameter of the pressing roller, the distance between the center of the rotating shaft and the center of the rotating support shaft, the length of the auxiliary pressing arm, a first included angle, a second included angle, a third included angle between the auxiliary pressing arm and a connecting line from the center of the rotating shaft to the center of the rotating support shaft and/or a fourth included angle between a connecting line between the center of the rotating shaft and the center of the coiled sheet and the pressing arm; the measurement parameters include: the actual value of the telescopic length of the telescopic oil cylinder, the thickness of the plate strip or the pressure of the telescopic oil cylinder;
the control device is also used for obtaining control parameters according to the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil, device parameters and measurement parameters;
and the control device is also used for sending a control signal to the telescopic oil cylinder according to the obtained control parameter so as to control the pressing position of the compression roller.
Optionally, the control device comprises: the device comprises a displacement sensor, a measuring device and a processor, wherein the displacement sensor is used for measuring the actual value of the telescopic length of the telescopic oil cylinder;
the displacement sensor and the measuring device are electrically connected with the processor, and the displacement sensor is arranged on the telescopic oil cylinder;
the processor is used for acquiring the roll diameter of a plate roll to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate roll, device parameters and the actual value of the telescopic length of the telescopic oil cylinder;
the processor is also used for calculating a theoretical value of the stretching length of the stretching oil cylinder according to the roll diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil and device parameters;
the processor is further used for obtaining a first control parameter according to a difference value between a theoretical value of the telescopic length of the telescopic oil cylinder and an actual value of the telescopic length of the telescopic oil cylinder, sending a first control signal to the telescopic oil cylinder according to the first control parameter, and controlling the pressing position of the compression roller through the first control signal.
Optionally, the processor is further configured to calculate a theoretical value of the telescopic length of the telescopic cylinder according to a relational expression of the diameter of the coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the coil, and the device parameter, where the relational expression of the diameter of the coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the coil, and the device parameter is as follows
Wherein H represents a theoretical value of the telescopic length of the telescopic oil cylinder; a represents a distance between the center of the rotation axis and the center of the rotation support axis; b represents the length of the auxiliary pressure arm; r represents the radius of the coil; l represents the length of the press arm; r represents the radius of the press roll; a represents a distance between an outer surface of the press roller and an outer surface of the coil; δ represents a first included angle; and gamma represents the second angle.
According to another aspect of the embodiments of the present invention, there is also provided a control method of a tear prevention control apparatus, including:
acquiring the roll diameter of a plate roll to be rolled, the distance between the outer surface of a compression roller and the outer surface of the plate roll, device parameters and measurement parameters; wherein the device parameters include: the length of the pressing arm, the radius or the diameter of the pressing roller, the distance between the center of the rotating shaft and the center of the rotating support shaft, the length of the auxiliary pressing arm, a first included angle, a second included angle, a third included angle between the auxiliary pressing arm and a connecting line from the center of the rotating shaft to the center of the rotating support shaft and/or a fourth included angle between a connecting line between the center of the rotating shaft and the center of the coiled sheet and the pressing arm; the measurement parameters include: the actual value of the telescopic length of the telescopic oil cylinder, the thickness of the plate strip or the pressure of the telescopic oil cylinder;
obtaining control parameters according to the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil, device parameters and measurement parameters;
sending a control signal to a telescopic oil cylinder according to the obtained control parameter so as to control the pressing position of the compression roller;
the first included angle is a preset included angle between the auxiliary pressing arm and the pressing arm, and the second included angle is a preset included angle between the center of the rotating shaft and the center of the plate coil to be rolled and a connecting line of the center of the rotating supporting shaft.
Optionally, the obtaining a control parameter according to the diameter of the plate coil to be rolled, the distance between the outer surface of the press roll and the outer surface of the plate coil, the device parameter, and the measurement parameter includes:
calculating to obtain a theoretical value of the telescopic length of the telescopic oil cylinder according to the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil and device parameters;
and taking the difference value between the theoretical value of the telescopic length of the telescopic oil cylinder and the actual value of the telescopic length as a first control parameter.
Optionally, the calculating, according to the diameter of the plate coil to be rolled, the distance between the outer surface of the press roll and the outer surface of the plate coil, and the device parameter, to obtain the theoretical value of the telescopic length of the telescopic cylinder includes:
calculating to obtain a theoretical value of the stretching length of the stretching oil cylinder according to a relational expression of the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil and device parameters, wherein the relational expression of the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil and the device parameters is as follows
Wherein H represents a theoretical value of the telescopic length of the telescopic oil cylinder; a represents a distance between the center of the rotation axis and the center of the rotation support axis; b represents the length of the auxiliary pressure arm; r represents the radius of the coil; l represents the length of the press arm; r represents the radius of the press roll; a represents the distance between the outer surface of the compression roller and the outer surface of the plate roll; δ represents a first included angle; and gamma represents the second angle.
There is also provided in accordance with another aspect of an embodiment of the present invention a temper mill including a tear resistant control apparatus as described above.
The embodiment of the invention has the following beneficial effects:
the control device is connected with the telescopic oil cylinder, the auxiliary pressure arm, the rotating shaft, the pressure arm and the press roller (or called as a tearing-proof roller) in a matching way, so that the problem of tearing or breaking of the plate strip in the production process of the cold-rolled strip steel can be solved. The anti-tearing control device effectively reduces the normal tearing force and the tearing speed of the strip steel, adopts position closed-loop control to realize follow-up pressing of the compression roller, has the function of tension disturbance resistance, and is high in control precision. The anti-tearing control device improves the yield of deep-drawn plates, improves the quality of cold-rolled plates and brings great economic and social benefits.
Drawings
FIG. 1 is a schematic diagram of the mechanism of a leveler provided in the prior art;
FIG. 2 is a schematic view of uncoiling of a strip during full-lap rolling according to the prior art;
FIG. 3 is a schematic view of uncoiling of a strip during rolling of a tail coil in the prior art;
FIG. 4 is a schematic structural diagram of a tear-resistant control device according to an embodiment of the present invention;
fig. 5 is a second schematic structural diagram of a tear-resistant control device according to an embodiment of the present invention;
fig. 6 is a schematic view of a relationship curve between the diameter of a steel coil and the change of the tearing-prevention roller along with the change of the coil diameter according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a custom function block of a control device according to an embodiment of the present invention;
fig. 8 is a schematic flowchart of a control method of a tear-prevention control device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another control method of a tear-prevention control device according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The terms first, second and the like in the description and in the claims of the present invention 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, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
Fig. 1 is a schematic diagram of the mechanism of a leveler, which includes: an uncoiler 1, an S-roll 2 and a roll 3. When a coil of sheet, or called steel coil, is opened by the tension T of the unwinder 1 shown in fig. 1, the strip should be opened at a shown in fig. 2 and 3 tangent to the coil, assuming that the strip is completely flexible and no sticking occurs. But the actual opening point of the strip from the coil is at b in fig. 2 and 3 due to the adhesion between the strips. Because the strip steel has certain rigidity, a reverse bending area is arranged at the position close to the opening. And defining an included angle between the direction of the tension T and the tangent line passing through the point b on the surface of the steel coil as an expansion angle theta. The spread angle θ is related to the bond strength and the tension T magnitude: the stronger the bond, the larger the theta angle; the larger the tension T, the smaller the angle θ.
Obviously, in the uncoiling process, the strip steel is under the combined action of pulling and bending and is in a relatively complex stress state, and the stress of the strip steel is related to uncoiling tension T, plate strip thickness T, bonding degree sigma F, plate coil radius R and the like. When the surface stress exceeds the yield limit, plastic deformation may occur which causes cross-crease defects in the surface. In order to prevent the tearing of the steel strip, an anti-tearing control device can be additionally arranged at the head of the uncoiler 1, and the anti-tearing control of the steel strip (or called the strip) is realized by adopting a control method of a self-learning model.
Based on the above principle, an embodiment of the present invention provides a tear-prevention control device, referring to fig. 4, including: the device comprises telescopic oil cylinders 4 and 5, an auxiliary pressure arm 6, a rotating shaft 7, a pressure arm 8, a pressure roller (or a tearing-proof roller) 9 and a control device (not shown in the figure). Wherein,
the telescopic oil cylinders 4 and 5 are electrically connected with the control device; the telescopic oil cylinders 4 and 5 are provided with a rotary supporting shaft 4 and a telescopic arm 5, and the telescopic arm 5 is connected with one end of the auxiliary pressure arm 6; the other end of the auxiliary pressure arm 6 and one end of the pressure arm 8 are both connected with the rotating shaft 7, a first included angle is preset between the auxiliary pressure arm 6 and the pressure arm 8, and a second included angle is preset between the center of the rotating shaft 7 and a connecting line of the center of the plate coil to be rolled and the center of the rotating support shaft 4; the other end of the pressing arm 8 is connected with the pressing roller 9.
The control device is used for acquiring the coil diameter of the plate coil to be rolled, the distance between the outer surface of the press roll 9 and the outer surface of the plate coil, device parameters and measurement parameters.
Wherein the device parameters include: the length of the pressing arm 8, the radius or the diameter of the pressing roller 9, the distance between the center of the rotating shaft 7 and the center of the rotating support shaft 4, the length of the auxiliary pressing arm 6, the first included angle, the second included angle, a third included angle between the auxiliary pressing arm 6 and a connecting line from the center of the rotating shaft 7 to the center of the rotating support shaft 4 and/or a fourth included angle between a connecting line between the center of the rotating shaft 7 and the center of the coiled sheet and the pressing arm 8; the measurement parameters include: the actual value of the telescopic length of the telescopic cylinders 4, 5, the plate strip thickness or the pressure of the telescopic cylinders 4, 5.
The control device is also used for obtaining control parameters according to the coil diameter of the plate coil to be rolled, the distance between the outer surface of the press roll 9 and the outer surface of the plate coil, device parameters and measurement parameters.
And the control device is also used for sending control signals to the telescopic oil cylinders 4 and 5 according to the obtained control parameters so as to control the pressing position of the press roller 9.
In the embodiment of the invention, the control device is matched and connected with the telescopic oil cylinders 4 and 5, the auxiliary pressure arm 6, the rotating shaft 7, the pressure arm 8 and the pressure roller (or called as a tearing-proof roller) 9, so that the problem of tearing or breaking of the plate strip in the production process of the cold-rolled strip steel can be solved. The anti-tearing control device effectively reduces the normal tearing force and the tearing speed of the strip steel, adopts position closed-loop control to realize follow-up pressing of the compression roller, has the function of tension disturbance resistance, and is high in control precision. The anti-tearing control device improves the yield of deep-drawn plates, improves the quality of cold-rolled plates and brings great economic and social benefits.
On the basis of the above embodiment, the embodiment of the invention provides a tear-preventing control device, which controls the pressing position of the press roller 9 by controlling the telescopic length of the telescopic cylinders 4 and 5.
Specifically, the control device includes: the displacement sensor is used for measuring the actual value of the telescopic length of the telescopic oil cylinders 4 and 5, and the measuring device and the processor are used for measuring the coil diameter of the plate coil to be rolled; the displacement sensor and the measuring device are electrically connected with the processor, and the displacement sensor is arranged on the telescopic oil cylinders 4 and 5.
The processor is used for acquiring the roll diameter of a plate roll to be rolled, the distance between the outer surface of the compression roller 9 and the outer surface of the plate roll, device parameters and actual values of the telescopic lengths of the telescopic oil cylinders 4 and 5; the processor is also used for calculating a theoretical value of the stretching length of the stretching oil cylinders 4 and 5 according to the roll diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller 9 and the outer surface of the plate coil and device parameters; the processor is further used for obtaining a first control parameter according to a difference value between a theoretical value of the telescopic length of the telescopic oil cylinders 4 and 5 and an actual value of the telescopic length of the telescopic oil cylinders 4 and 5, sending a first control signal to the telescopic oil cylinders 4 and 5 according to the first control parameter, and controlling the pressing position of the press roller 9 through the first control signal.
The processor is also used for calculating a theoretical value of the telescopic length of the telescopic oil cylinders 4 and 5, namely a theoretical value of the length of the telescopic arm, according to the relation among the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller 9 and the outer surface of the plate coil and the device parameters, wherein the relation among the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller 9 and the outer surface of the plate coil and the device parameters is as follows
Wherein, H represents the theoretical value of the telescopic length of the telescopic oil cylinders 4 and 5; a represents the distance between the center of the rotation shaft 7 and the center of the rotation support shaft 4; b represents the length of the auxiliary pressure arm 6; r represents the radius of the coil; l represents the length of the pressing arm 8; r represents the radius of the press roll 9; a represents the distance between the outer surface of the press roll 9 and the outer surface of the coil; δ represents a first included angle; and gamma represents the second angle.
It should be noted that the distance a between the outer surface of the press roll 9 and the outer surface of the coil is an empirical value obtained in an actual production process, but is not limited thereto.
The derivation process of equation (1) is as follows
H2＝a2+b2-2ab*cosβ (2)
Wherein β denotes the third angle.
Obtained by squaring
β＝δ-γ-θ (4)
Where θ represents a fourth angle.
From the trigonometric relationship shown in FIG. 5, the simplified θ angle is calculated as follows
Obtained according to the sine theorem
And (3) obtaining a calculation formula (1) that the adjusting distance H of the telescopic oil cylinders 4 and 5 changes along with the coil diameter R according to formulas (2) to (6).
If the allowable maximum diameter of the steel coil is phi 2000mm, the allowable maximum width of the steel coil is 1300mm, the diameters of the telescopic oil cylinders 4 and 5 are 125mm, the telescopic arm 5 is 90mm, the stroke of the telescopic oil cylinders 4 and 5 is 550mm, and the distance a between the center of the rotating shaft 7 and the centers of the telescopic oil cylinders 4 and 5 is 1506 mm; the length b of the auxiliary pressure arm 6 is 800mm, the length L of the pressure arm 8 is 1971mm, the radius r of the pressure roller 9 is 155mm, and the first included angle delta is 153.8 degrees; the second included angle gamma is 36.7 degrees. The numerical values of the above parameters are substituted into formula (1).
According to the formula (7), the radius R of the steel coil is a function of the telescopic position of the oil cylinder, the requirements of the production process on the track and the position of the compression roller 9 are combined, the compression roller 9 can stably adjust the distance A value along the track according to the change of the coil diameter in control, and the A value is kept within a precision range to carry out closed-loop following adjustment.
Fig. 5 shows the adjustment condition that the distance between the compression roller 9 and the outer diameter of the steel coil is controlled to be 22mm in the rolling process, and referring to fig. 5, it can be seen that as the coil diameter of the steel coil is continuously reduced, the compression roller 9 is smoothly pressed down and always keeps floating adjustment following within the range of 22mm from the surface of the strip steel, and the feasibility and the precision of the anti-tearing control device are verified.
It should be noted that, in this way, the pressing position of the press roll 9 can be controlled well by a sensor, and the influence of disturbances such as tension fluctuation can be effectively inhibited, so as to stably and effectively prevent the tearing condition caused by adhesion in the strip steel rolling process. The displacement sensor can be Kangyu series KYDM-LP1A4210, has a measurement precision of +/-0.3 mm, and can meet the requirement of the measurement precision.
On the basis of the above embodiment, the embodiment of the present invention provides another anti-tear control device, which controls the pressing position of the pressing roller 9 by controlling the rotation angle of the auxiliary pressing arm 6 or the pressing arm 8.
Specifically, the control device includes: an encoder for controlling the depressed position of the platen roller 9 by the rotation angle of the auxiliary platen arm 6 or the platen arm 8; the controllers of the telescopic oil cylinders 4 and 5 are electrically connected with the encoder, and the encoder is arranged on the rotating shaft 7.
At this time, the device parameters further include: the number of pulses of the encoder.
The encoder is used for acquiring the pulse number and the plate belt thickness of the encoder; the encoder is also used for calculating the rotation angle of the auxiliary pressure arm 6 or the pressure arm 8 according to the pulse number and the plate strip thickness of the encoder, and the rotation angle of the auxiliary pressure arm 6 or the pressure arm 8 is a second control parameter; and the encoder is also used for sending a second control signal to the telescopic oil cylinders 4 and 5 according to the second control parameter, and controlling the pressing position of the press roller 9 through the second control signal.
In the embodiment of the present invention, since the swing of the pressing roll is the swing of the sector area surface, the auxiliary pressing arm 6 or the pressing arm 8 only swings in the range of 0 to 46 degrees, the change of the coil diameter of the coil to be rolled corresponds to the pulse change, and the pulse change formula corresponding to the change of the coil diameter of the coil to be rolled is: pulse number plate thickness/360.
Assuming that the absolute value encoder with the selected high pulse number is 8000 pulses/rotation, the thickness of the plate strip is 0.3mm, and the pulse change corresponding to the change of the coil diameter of the plate coil to be rolled is as follows: 8000 x 0.3/360 ≈ 6. The number of pulses rotated by the auxiliary pressure arm 6 or the pressure arm 8 per one rotation of the unwinder 1 is 6 pulses, but it is difficult to control the accuracy in this manner.
On the basis of the above embodiment, the embodiment of the invention provides another anti-tearing control device, which controls the pressing position of the press roller 9 by controlling the pressure of the telescopic cylinders 4 and 5.
Specifically, the control device includes: a pressure sensor for measuring the pressure of the telescopic cylinders 4, 5 and controlling the swing position of the press roller 9 according to the pressure of the telescopic cylinders 4, 5; the pressure sensor is electrically connected with the telescopic oil cylinders 4 and 5, and the pressure sensor is arranged on the telescopic oil cylinders 4 and 5.
The pressure sensor is used for measuring the pressure of the telescopic oil cylinders 4 and 5, and the pressure sensor is also used for sending a third control signal to the telescopic oil cylinders 4 and 5 according to the measured pressure of the telescopic oil cylinders 4 and 5, and controlling the swinging position of the press roller 9 through a pressure closed loop.
In the embodiment of the present invention, since the tension may fluctuate during the rolling process due to the non-linear self weight of the roll 9 during the swinging down process, and the pressing force of the roll 9 may be unstable, the closed-loop control may be difficult to be stabilized by using the pressure sensor.
It should be noted that, because the encoder and the pressure sensor respectively have the problem that the precision is difficult to control and the pressing position of the press roll 9 is difficult to control stably, a displacement sensor is preferably used in the above three modes, which can control the pressing position of the press roll 9 well by the sensor, and can effectively suppress the influence of disturbance such as tension fluctuation, so as to prevent the tearing condition caused by adhesion in the rolling process of the strip steel stably and effectively, and meet the precision requirement of the force measurement.
On the basis of the above embodiment, the embodiment of the invention further provides a leveling machine, which comprises the anti-tearing control device. Continuing with FIG. 1, the leveler further includes: the rolls 3, S-rolls 2 and unwinder 1 are, of course, not limited to the components listed here.
In order to realize the basic automatic control of the flattening machine, the system can adopt Siemens series PLC (programmable logic Controller) to form a two-part hardware system, wherein the first part is specially used for process control, S7-458CPU is selected as a processor, and the second part selects S7-400CPU414-2DP as a sequence control processor and other aspects of control.
An ET-200M distributed I/O station of ProfiBus-DP can be used as field bus equipment, 3 industrial computers are used as Human-Machine interfaces (HMI, Human Machine Interface), the HMI is programmed by WinCC ((Windows Control Center, Windows Control Center), WinCC is visual and convenient to use, operation is carried out according to system prompt, and various functional pictures can be created for input of rolling tables, state of unit equipment, alarm time limit, printing, summary and the like.
The basic automation system uses two communication networks: 1) ProfiBus-DP fieldbus; 2) industrial ethernet. Thus, the automatic control system and the transmission control system form a complete data communication.
Referring to fig. 6, a user-defined function block ARC (Anti-rip Roll Control) can be compiled according to the formula (1), the measured Roll diameter calculated quantity, the detected stretching position value RefH of the pressure roller 9 and the distance value a between the pressure roller 9 and the outer ring of the steel Roll, which needs to be maintained, are connected to variables, and parameters of PI (proportional integral controller) parameters are adjusted in actual production, so as to achieve fast response and accurate positioning. The output OUT is directly sent to the opening degree control of the oil cylinder after amplitude limiting control, so that the oil cylinder can be dynamically adjusted according to the change of the winding diameter.
Through debugging and the optimization adjustment of PI parameters, the normal tearing force and the tearing speed of the strip steel are effectively reduced by the anti-tearing roller, the position closed-loop control is adopted, the anti-tearing control device and the flattening machine can realize the follow-up pressing of the compression roller 9, the anti-tearing roller has the tension disturbance resisting function, and the control precision is high. The anti-tearing control device and the leveling machine improve the yield of deep-drawn plates and improve the quality of cold-rolled plates, thereby bringing greater economic and social benefits.
Referring to fig. 8, an embodiment of the present invention provides a control method of a tear-prevention control device, where the control method of the tear-prevention control device includes the following steps: s801 to S803.
S801, acquiring the coil diameter of a plate coil to be rolled, the distance between the outer surface of the compression roller 9 and the outer surface of the plate coil, device parameters and measurement parameters; wherein the device parameters include: the length of the pressing arm 8, the radius or the diameter of the pressing roller 9, the distance between the center of the rotating shaft 7 and the center of the rotating support shaft 4, the length of the auxiliary pressing arm 6, a first included angle, a second included angle, a third included angle between the auxiliary pressing arm and a connecting line from the center of the rotating shaft 7 to the center of the rotating support shaft 4 and/or a fourth included angle between a connecting line between the center of the rotating shaft and the center of the plate roll and the pressing arm; the measurement parameters include: the actual value of the telescopic length of the telescopic cylinders 4 and 5, the plate strip thickness or the pressure of the telescopic cylinders 4 and 5;
s802, obtaining control parameters according to the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller 9 and the outer surface of the plate coil, device parameters and measurement parameters;
and S803, sending a control signal to the telescopic oil cylinders 4 and 5 according to the obtained control parameter, and further controlling the pressing position of the press roller 9.
In the embodiment of the invention, control parameters are obtained according to the diameter of the coil to be rolled, the distance between the outer surface of the compression roller 9 and the outer surface of the coil, device parameters and measurement parameters, and then control signals are sent to the telescopic oil cylinders 4 and 5 according to the obtained control parameters so as to control the pressing position of the compression roller 9, so that the problem of tearing or fracture of the plate strip in the production process of the cold-rolled strip steel can be solved. The control method of the anti-tearing control device effectively reduces the normal tearing force and the tearing speed of the strip steel, adopts position closed-loop control to realize follow-up pressing of the compression roller, has the function of tension disturbance resistance, and is high in control precision. The control method of the anti-tearing control device improves the yield of the deep-drawn sheet, improves the quality of the cold-rolled sheet and brings great economic and social benefits.
In the embodiment of the invention, the control method of the anti-tearing control device can realize the control of the compression roller in various ways, referring to fig. 9, the stretching length of the stretching oil cylinders 4 and 5 is detected by a displacement sensor according to a formula, and the value A is kept in a precision range for closed-loop following adjustment by adjusting the stretching length according to the relationship between the stretching length and the radius of the steel coil and the distance A between the outer surface of the compression roller 9 and the outer surface of the plate coil.
On the basis of the foregoing embodiment, an embodiment of the present invention provides another control method for a tear-prevention control device, where S802 includes: s8021 to S8022.
S8021, calculating to obtain a theoretical value of the stretching length of the stretching oil cylinders 4 and 5 according to the roll diameter of the plate roll to be rolled, the distance between the outer surface of the pressing roll 9 and the outer surface of the plate roll and device parameters;
s8022, using a difference between a theoretical value of the telescopic length of the telescopic cylinders 4, 5 and an actual value of the telescopic length as a first control parameter.
The S8021 includes: s80211.
S80211, calculating a theoretical value of the stretching length of the stretching cylinders 4 and 5 according to the relationship among the diameter of the coil to be rolled, the distance between the outer surface of the pressing roll 9 and the outer surface of the coil, and the device parameter, where the relationship among the diameter of the coil to be rolled, the distance between the outer surface of the pressing roll 9 and the outer surface of the coil, and the device parameter is formula (1), and is not described herein again.
On the basis of the foregoing embodiment, an embodiment of the present invention provides another control method for a tear-prevention control device, where S802 includes: s8023 to S8024.
S8023, acquiring the pulse number and the plate belt thickness of the encoder;
s8024, calculating the rotation angle of the auxiliary pressure arm 6 or the pressure arm 8 according to the pulse number of the encoder and the plate strip thickness, wherein the rotation angle of the auxiliary pressure arm 6 or the pressure arm 8 is a second control parameter.
On the basis of the foregoing embodiment, an embodiment of the present invention provides another control method for a tear-prevention control device, where S802 includes: s8025 to S8026.
S8025, measuring the pressure of the telescopic oil cylinders 4 and 5;
s8026, according to the measured pressure of the telescopic oil cylinders 4 and 5, sending a third control signal to the telescopic oil cylinders 4 and 5, and controlling the swing position of the press roller 9 through a pressure closed loop.
In the embodiment of the invention, through debugging and optimal adjustment of PI parameters, the control method of the anti-tearing control device effectively reduces the normal tearing force and the tearing speed of the strip steel, adopts position closed-loop control to realize follow-up pressing of the compression roller, has the function of tension disturbance resistance and has high control precision. The control method of the anti-tearing control device improves the yield of the deep-drawn sheet, improves the quality of the cold-rolled sheet and brings great economic and social benefits.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A tear resistant control device, comprising: the device comprises a telescopic oil cylinder, an auxiliary pressure arm, a rotating shaft, a pressure arm, a compression roller and a control device;
the telescopic oil cylinder is electrically connected with the control device and is provided with a telescopic arm and a rotary supporting shaft;
the telescopic arm is connected with one end of the auxiliary pressure arm;
the other end of the auxiliary pressure arm and one end of the pressure arm are both connected with the rotating shaft, a first included angle is preset between the auxiliary pressure arm and the pressure arm, and a second included angle is preset between the center of the rotating shaft and a connecting line of the center of a plate coil to be rolled and the center of the rotating support shaft;
the other end of the pressing arm is connected with the pressing roller;
the control device is used for acquiring the coil diameter of a plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil, device parameters and measurement parameters; wherein the device parameters include: the length of the pressing arm, the radius or the diameter of the pressing roller, the distance between the center of the rotating shaft and the center of the rotating support shaft, the length of the auxiliary pressing arm, a first included angle, a second included angle, a third included angle between the auxiliary pressing arm and a connecting line from the center of the rotating shaft to the center of the rotating support shaft and/or a fourth included angle between a connecting line between the center of the rotating shaft and the center of the coiled sheet and the pressing arm; the measurement parameters include: the actual value of the telescopic length of the telescopic oil cylinder, the thickness of the plate strip or the pressure of the telescopic oil cylinder;
the control device is also used for obtaining control parameters according to the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil, device parameters and measurement parameters;
and the control device is also used for sending a control signal to the telescopic oil cylinder according to the obtained control parameter so as to control the pressing position of the compression roller.
2. The tear resistant control device of claim 1 wherein the control device comprises: the device comprises a displacement sensor, a measuring device and a processor, wherein the displacement sensor is used for measuring the actual value of the telescopic length of the telescopic oil cylinder;
the displacement sensor and the measuring device are electrically connected with the processor, and the displacement sensor is arranged on the telescopic oil cylinder;
the processor is used for acquiring the roll diameter of a plate roll to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate roll, device parameters and the actual value of the telescopic length of the telescopic oil cylinder;
the processor is also used for calculating a theoretical value of the stretching length of the stretching oil cylinder according to the roll diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil and device parameters;
the processor is further used for obtaining a first control parameter according to a difference value between a theoretical value of the telescopic length of the telescopic oil cylinder and an actual value of the telescopic length of the telescopic oil cylinder, sending a first control signal to the telescopic oil cylinder according to the first control parameter, and controlling the pressing position of the compression roller through the first control signal.
3. The tear resistance control device of claim 2, wherein the processor is further configured to calculate a theoretical value of the telescoping length of the telescoping cylinder based on a relationship between the diameter of the coil to be rolled, the distance between the outer surface of the pressure roll and the outer surface of the coil, and the device parameter, wherein the relationship between the diameter of the coil to be rolled, the distance between the outer surface of the pressure roll and the outer surface of the coil, and the device parameter is as follows
Wherein H represents a theoretical value of the telescopic length of the telescopic oil cylinder; a represents a distance between the center of the rotation axis and the center of the rotation support axis; b represents the length of the auxiliary pressure arm; r represents the radius of the coil; l represents the length of the press arm; r represents the radius of the press roll; a represents a distance between an outer surface of the press roller and an outer surface of the coil; δ represents a first included angle; and gamma represents the second angle.
4. A control method of a tear-prevention control device, comprising:
acquiring the roll diameter of a plate roll to be rolled, the distance between the outer surface of a compression roller and the outer surface of the plate roll, device parameters and measurement parameters; wherein the device parameters include: the length of the pressing arm, the radius or the diameter of the pressing roller, the distance between the center of the rotating shaft and the center of the rotating support shaft, the length of the auxiliary pressing arm, a first included angle, a second included angle, a third included angle between the auxiliary pressing arm and a connecting line from the center of the rotating shaft to the center of the rotating support shaft and/or a fourth included angle between a connecting line between the center of the rotating shaft and the center of the coiled sheet and the pressing arm; the measurement parameters include: the actual value of the telescopic length of the telescopic oil cylinder, the thickness of the plate strip or the pressure of the telescopic oil cylinder;
obtaining control parameters according to the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil, device parameters and measurement parameters;
sending a control signal to a telescopic oil cylinder according to the obtained control parameter so as to control the pressing position of the compression roller;
the first included angle is a preset included angle between the auxiliary pressing arm and the pressing arm, and the second included angle is a preset included angle between the center of the rotating shaft and the center of the plate coil to be rolled and a connecting line of the center of the rotating supporting shaft.
5. The control method according to claim 4, wherein the obtaining of the control parameters based on the coil diameter of the coil to be rolled, the distance between the outer surface of the press roll and the outer surface of the coil, the device parameters and the measurement parameters comprises:
calculating to obtain a theoretical value of the telescopic length of the telescopic oil cylinder according to the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil and device parameters;
and taking the difference value between the theoretical value of the telescopic length of the telescopic oil cylinder and the actual value of the telescopic length as a first control parameter.
6. The control method according to claim 5, wherein the calculating of the theoretical value of the telescopic length of the telescopic cylinder according to the diameter of the coil to be rolled, the distance between the outer surface of the press roll and the outer surface of the coil and the device parameters comprises:
calculating to obtain a theoretical value of the stretching length of the stretching oil cylinder according to a relational expression of the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil and device parameters, wherein the relational expression of the diameter of the plate coil to be rolled, the distance between the outer surface of the compression roller and the outer surface of the plate coil and the device parameters is as follows
Wherein H represents a theoretical value of the telescopic length of the telescopic oil cylinder; a represents a distance between the center of the rotation axis and the center of the rotation support axis; b represents the length of the auxiliary pressure arm; r represents the radius of the coil; l represents the length of the press arm; r represents the radius of the press roll; a represents the distance between the outer surface of the compression roller and the outer surface of the plate roll; δ represents a first included angle; and gamma represents the second angle.
7. A temper mill, comprising the tear resistant control apparatus of any one of claims 1 to 3.
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| CN2865896Y (en) * | 2006-02-24 | 2007-02-07 | 宝山钢铁股份有限公司 | Deep bending roller of three-roll uncoiler |
| CN201579305U (en) * | 2009-12-10 | 2010-09-15 | 中冶南方工程技术有限公司 | Deep roll-bending device capable of horizontally moving |
| CN103084430B (en) * | 2011-10-28 | 2015-10-28 | 宝山钢铁股份有限公司 | A kind of band steel that reduces produces method and the device that waist rolls over defect |
| CN103203392B (en) * | 2012-01-13 | 2015-04-22 | 宝山钢铁股份有限公司 | Thick plate decoiling device and method |
| CN105951111B (en) * | 2016-07-13 | 2018-06-22 | 宝钢股份黄石涂镀板有限公司 | It is a kind of to eliminate the device and its control method that strip waist is creased on plug-type pickling line |
| CN107008772A (en) * | 2017-06-08 | 2017-08-04 | 中国重型机械研究院股份公司 | A kind of Full-automatic cold rolled steel coils start carry uncoiling system |
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Denomination of invention: A tear resistant control device, leveling machine and control method Effective date of registration: 20240102 Granted publication date: 20190521 Pledgee: Beijing SME financing re Guarantee Co.,Ltd. Pledgor: BEIJING BOJET TIANRUN CONTROL SYSTEM DEVELOPMENT Co.,Ltd. Registration number: Y2023990000654 |