CN102941249B - Mechanical pressing-type plate straightening machine control system and control method - Google Patents
Mechanical pressing-type plate straightening machine control system and control method Download PDFInfo
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- CN102941249B CN102941249B CN201210510997.6A CN201210510997A CN102941249B CN 102941249 B CN102941249 B CN 102941249B CN 201210510997 A CN201210510997 A CN 201210510997A CN 102941249 B CN102941249 B CN 102941249B
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Abstract
The invention discloses a mechanical pressing-type plate straightening machine control system and a control method. The control system comprises at least one pressing mechanism, at least one sensor, a programmable logic controller and at least one motor, wherein the pressing mechanism is used for driving a working roll of a straightening machine to move so as to adjust a roll gap of the working roll of the straightening machine; the at least one sensor is arranged at the roll gap of the working roll of the straightening machine and used for sensing the actual value of the roll gap of the working roll; the programmable logic controller is used for acquiring and processing signals from the at least one sensor; the at least one motor corresponds to the at least one pressing mechanism and used for controlling the at least one pressing mechanism to move; and the actual value and the target value of the roll gap of the working roll are compared and judged and the at least one motor is controlled by the programmable logic controller. By the mechanical pressing-type plate flattening machine control system and control method, the problems of the conventional plate straightening machine that the production efficiency is lowered, faulty operation is likely to occur, a straightening effect of plates is unsatisfactory, and the equipment failure rate and energy consumption are increased resulting from multiple repeated adjustments by operators are solved.
Description
Technical field
The present invention relates to plate-straightening machine, relate to control system and the control method of mechanical pressure formula plate flattening machine especially.
Background technology
Existing sheet metal is produced and processing enterprise, and such as iron and steel medium plate mill, nonferrous production enterprise and the factory such as mechanical, generally all will use plate flattening machine.After the upper and lower working roll that sheet material to be processed is rotated by plate flattening machine, the surface smoothness of sheet material can be made effectively to improve.In this technical process, the control of arbor press upper and lower working roll roll gap is an important job.Existing arbor press equipment, gap preset is generally manually adjusted by operative employee, not only require that operating personnel have rich experience, and be generally difficult to hold due to the inertia of machinery, often need repeatedly repetition test and adjustment, thus cause production efficiency to reduce, easily occur that maloperation, sheet material leveling effect are undesirable, the problem such as equipment failure rate and energy consumption increase.
Summary of the invention
The object of the present invention is to provide a kind of mechanical pressure formula plate flattening machine control system and control method, in order to solve existing plate flattening machine, its roll gap is manually adjusted by operating personnel, need repeatedly repetition test and adjustment, thus cause production efficiency to reduce, easily occur that maloperation, sheet material leveling effect are undesirable, problem that equipment failure rate and energy consumption increase.
Mechanical pressure formula plate flattening machine control system of the present invention, comprise, at least one screw-down moves for driving the working roll of this arbor press, to adjust the roll gap of the working roll of this arbor press, wherein, at least one sensor, is arranged on the roll gap place of the working roll of this arbor press, for sensing the actual value of the roll gap of this working roll; One programmable logic controller (PLC), can obtain and process the signal of this at least one sensor; At least one motor, with this at least one screw-down one_to_one corresponding, for controlling this at least one screw-down motion; The actual value of the roll gap of this working roll and the desired value of roll gap compare and judge by this programmable logic controller (PLC), and control this at least one motor.
The control method of mechanical pressure formula plate flattening machine of the present invention, drive the working roll of this arbor press to move by screw-down, to adjust the roll gap of the working roll of this arbor press, this control method comprises: the actual value obtaining the roll gap of this working roll; By this motor of Frequency Converter Control; Judge whether the desired value of the roll gap of working roll is greater than this actual value; When this desired value is greater than this actual value, this screw-down rises, and carries out following action: this desired value subtracts the difference of this actual value and one first value compares; The difference subtracting this actual value as this desired value is greater than this first value, judges whether the difference that this desired value subtracts this actual value is more than or equal to one second value; The difference subtracting this actual value as this desired value is more than or equal to this second value, then this frequency converter carries out rapid adjustment, and the difference subtracting this actual value as this desired value is less than this second value, then this frequency converter adjusts at a slow speed; The difference subtracting this actual value as this desired value is less than or equal to this first value, then control the enable disconnection of this frequency converter; When this desired value is less than this actual value, this screw-down declines, and carries out following action: this actual value subtracts the difference of this desired value and one first value compares; The difference subtracting this desired value as this actual value is greater than this first value, judges whether the difference that this actual value subtracts this desired value is more than or equal to one second value; The difference subtracting this desired value as this actual value is more than or equal to this second value, then frequency converter carries out rapid adjustment, and the difference subtracting this desired value as this actual value is less than this second value, then frequency converter adjusts at a slow speed; The difference subtracting this desired value as this actual value is less than or equal to this first value, then control the enable disconnection of this frequency converter; When this desired value equals this actual value, this screw-down stops.
In sum, the present invention is by arranging the desired value of input and output material both sides working roll roll gap ideally, compare with the actual value of input and output material both sides working roll roll gap under real-time status, controlled by the motion of motor to screw-down according to comparative result, with dynamic conditioning input and output material both sides working roll gap values between rollers, also input and output material both sides working roll gap values between rollers is adjusted with regard to achieving by the mode of electrical control, solve existing plate flattening machine, operating personnel are needed manually to adjust, need repeatedly repetition test and adjustment reason, thus cause production efficiency to reduce, easy generation maloperation, sheet material leveling effect is undesirable, the problem that equipment failure rate and energy consumption increase.
Accompanying drawing explanation
Fig. 1 is the module map of the present invention's machinery pressure formula plate flattening machine control system first embodiment;
Fig. 2 is the module map of the present invention's machinery pressure formula plate flattening machine control system second embodiment;
Fig. 3 is the module map of the present invention's machinery pressure formula plate flattening machine control system the 3rd embodiment;
Figure 4 shows that the flow chart of the control method of the present invention's machinery pressure formula plate flattening machine;
Figure 5 shows that the flow chart of another control method of the present invention's machinery pressure formula plate flattening machine.
Detailed description of the invention
Fig. 1 is the module map of the present invention's machinery pressure formula plate flattening machine control system first embodiment, as shown in Figure 1, the present embodiment machinery pressure formula plate flattening machine control system comprises programmable logic controller (PLC) 1(Programmable Logic Controller, be called for short PLC), frequency converter 2, motor 3, screw-down 5, working roll 9 and sensor 4.In practice, general arbor press feed side and exit side can each installation a pair working rolls, the roll gap of two pairs of working rolls is respectively by a screw-down adjustment, two screw-downs are respectively driven by a frequency converter and a motor, due to the working roll of feed side and the working roll drives structure of exit side and mode similar, therefore the first embodiment is only for side.
Sketch the specific implementation of the machinery pressure formula plate flattening machine control system of the first embodiment.PLC1 connects frequency converter 2 and sensor 4 respectively, and frequency converter 2 connects motor 3, and the output shaft of motor 3 connects screw-down 5, and screw-down 5 connects working roll 9, and sensor 4 is arranged on the roll gap place of working roll 9.Sensor 4 is for sensing the actual value of working roll 9 roll gap.Motor 3 moves for controlling screw-down 5.PLC1 can obtain the actual value of the roll gap that sensor 4 transmits, and the desired value of actual value and working roll 9 roll gap is compared, and according to the result compared, PLC1, to frequency converter 2 sending controling instruction, makes frequency converter 2 control the running of motor 3.The output shaft of motor 3 drives screw-down 5 to move, and screw-down 5 moves for driving working roll 9, to adjust the roll gap of the working roll 9 of arbor press.
In a first embodiment, structure for machinery pressure formula plate flattening machine control system is described, in a second embodiment, by the structure for the present invention's machinery pressure formula plate flattening machine control system used general in reality, the description of further refinement is carried out.Fig. 2 is the module map of the present invention's machinery pressure formula plate flattening machine control system second embodiment, in the present embodiment, the roll gap of control system to the roll gap of the working roll of exit side and the working roll of feed side adjusts, and therefore, the quantity of motor, frequency converter and screw-down is two.As shown in Figure 2, frequency converter 12, motor 13, screw-down 15, working roll 19 and sensor 14 is comprised further.PLC1 connects frequency converter 12 and frequency converter 2 and sensor 14 and sensor 4 respectively.Frequency converter 2 connects motor 3, and the output shaft of motor 3 connects screw-down 5, and screw-down 5 connects working roll 9, and sensor 4 is arranged on the roll gap place of working roll 9.Frequency converter 12 connects motor 13, and the output shaft of motor 13 connects screw-down 15, and screw-down 15 connects working roll 19, and sensor 14 is arranged on the roll gap place of working roll 19.Sensor 14 is for sensing the actual value of working roll 19 roll gap.Motor 13 moves for controlling screw-down 15.PLC1 can obtain the actual value of the roll gap that sensor 14 transmits, and the desired value of actual value and working roll 19 roll gap is compared, and according to the result compared, PLC1, to frequency converter 12 sending controling instruction, makes frequency converter 12 control the running of motor 13.The output shaft of motor 13 drives screw-down 15 to move, and screw-down 15 moves for driving working roll 19, to adjust the roll gap of the working roll 19 of arbor press.Working roll 19 and working roll 9 are respectively as the working roll of feed side and exit side.Sensor 4 and sensor 14 can respectively have one, also can be further refined as multiple, to improve the accuracy of measurement data.
Wherein, working roll 9 and working roll 19 can adjust separately according to process requirements or adjust simultaneously.Such as, when needing adjustment working roll 9, namely frequency converter 2 is run.But more situation is that working roll 9 need adjust with the roll gap of working roll 19 simultaneously.Adjustment process needs the corresponding frequency converter of PLC1 programme-control to run.
Fig. 3 is the module map of the present invention's machinery pressure formula plate flattening machine control system the 3rd embodiment, as shown in Figure 3,3rd embodiment is only for exit side or feed side side, the present embodiment machinery pressure formula plate flattening machine control system comprises PLC1, frequency converter 2, motor 3, screw-down 5, working roll 9, sensor 4, industrial computer 8, upper limit interlock 7 and lower limit interlock 6.Wherein, a pair upper limit interlock 7 and lower limit interlock 6 can be respectively set at exit side and feed side.
The specific implementation of the machinery pressure formula plate flattening machine control system of brief description the 3rd embodiment.PLC1 connects frequency converter 2, sensor 4, industrial computer 8, lower limit interlock 6 and upper limit interlock 7 respectively, frequency converter 2 connects motor 3, the output shaft of motor 3 connects screw-down 5, and screw-down 5 connects working roll 9, and sensor 4 is arranged on the roll gap place of working roll 9.Sensor 4 is for sensing the actual value of working roll 9 roll gap.Motor 3 moves for controlling screw-down 5.PLC1 can obtain the actual value of the roll gap that sensor 4 transmits, and the desired value of actual value and working roll 9 roll gap is compared, and according to the result compared, PLC1, to frequency converter 2 sending controling instruction, makes frequency converter 2 control the running of motor 3.The output shaft of motor 3 drives screw-down 5 to move, and screw-down 5 moves for driving working roll 9, to adjust the gap values between rollers of the working roll 9 of this arbor press.Upper limit interlock 7 is arranged on the limes superiors position place of working roll 9 roll gap, for after working roll 9 arrives limes superiors position, controls the enable disconnection of frequency converter 2; Lower limit interlock 6 is arranged on the limit inferior position place of working roll 9 roll gap, for after working roll 9 arrives limit inferior position, controls the enable disconnection of frequency converter 2.
Wherein, the sensor 4 of above-described embodiment can be magnetostrictive displacement sensor.
Wherein, key in the desired value of the roll gap of feed side and exit side work rod from HMI equipment such as industrial computers after, send roll gap and automatically adjust instruction, frequency converter each self-driven input and output material both sides roll gap regulation motor of feed side and exit side, adjusts to required desired value by input and output material both sides gap values between rollers.The control procedure of brief description the present invention machinery pressure formula rectification of plate control system.
For the machinery of the 3rd embodiment pressure formula rectification of plate control system, and working roll 9 is adjusted, as shown in Figure 3.
Industrial computer 8 provides the desired value of working roll 9 roll gap to PLC1, i.e. the ideal position of actual desired adjustment.
PLC1 obtains the actual value of working roll 9 roll gap of sensor 4;
The control program of PLC1 judges whether the desired value of working roll 9 roll gap is greater than the actual value of working roll 9 roll gap;
When desired value is greater than actual value, the difference and the first value that desired value are subtracted actual value compare, and the first value is the whether enable cut off value of frequency converter 2.The difference subtracting actual value as desired value is less than or equal to the first value, then control the enable disconnection of frequency converter 2; The difference subtracting actual value as desired value is greater than the first value, then continue to judge whether the difference that desired value subtracts actual value is more than or equal to the second value, and the second value is the cut off value that frequency converter 2 controls motor 3 fast turn-around and microrunning.The difference subtracting actual value as desired value is more than or equal to the second value, then frequency converter 2 controls motor 3 rapid adjustment screw-down 5, and the difference subtracting actual value as desired value is less than the second value, then frequency converter 2 controls the whole screw-down 5 of motor 3 slow-action.
When desired value is less than actual value, actual value subtracts the difference of desired value and the first value compares.The difference subtracting desired value as actual value is less than or equal to the first value, then control the enable disconnection of frequency converter 2.The difference subtracting desired value as actual value is greater than the first value, judges whether the difference that actual value subtracts desired value is more than or equal to the second value; The difference subtracting desired value as actual value is more than or equal to the second value, then frequency converter 2 carries out rapid adjustment, and the difference subtracting desired value as actual value is less than the second value, then frequency converter 2 adjusts at a slow speed;
When desired value is greater than actual value, and the difference that desired value subtracts actual value is less than or equal to the first value, then control the enable disconnection of frequency converter 2, and screw-down 5 rises by inertia and accurate location; When desired value is less than actual value, and the difference that actual value subtracts desired value is less than or equal to the first value, then control the enable disconnection of frequency converter 2, and screw-down 5 declines by inertia and accurate location.
Wherein, the second above-mentioned value is generally the 5-20 of the first value doubly, and such as the first value is 0.1mm, and the second value is 1.5mm.
For one preferably embodiment, with reference to figure 2, PLC1 control program in the course of the work, can also make the following judgment:
Judge whether the difference of working roll 9 roll gap desired value and working roll 19 roll gap desired value or the difference of working roll 9 roll gap actual value and working roll 19 roll gap actual value are more than or equal to the 3rd value, as the absolute value of the difference of the desired value of the desired value of the roll gap of feed side and the roll gap of exit side, be more than or equal to the 3rd value, then control this frequency converter 2 and the enable disconnection of frequency converter 12; As the absolute value of the difference of the actual value of the actual value of the roll gap of feed side and the roll gap of exit side, be more than or equal to the 3rd value, then control this frequency converter 2 and the enable disconnection of frequency converter 12;
Wherein, the 3rd value is the mechanical process parameters relevant with the maximum amount of fascinating of working roll roll gap of arbor press, and the arbor press of different size and different application occasion, this parameter is also different.4-6mm is generally for small-sized arbor press the 3rd value, 6-15mm is generally for big-and-middle-sized arbor press the 3rd value.
Figure 4 shows that the flow chart of the control method of the present invention's machinery pressure formula plate flattening machine.As shown in Figure 4, the control method of a kind of mechanical pressure formula plate flattening machine of the present invention, drive working roll motion by screw-down, to adjust the roll gap of the working roll of this arbor press, this control method comprises:
S101 obtains the actual value of working roll roll gap;
The actual value of the roll gap of working roll and the desired value of roll gap compare and judge by S102, and drive the screw-down of arbor press by a motor.
Figure 5 shows that the flow chart of another control method of the present invention's machinery pressure formula plate flattening machine, and by frequency converter, rotating speed control is carried out to motor, as shown in Figure 5, the actual value of the roll gap of working roll and the desired value of roll gap compare and judge by the step S 102 in above-mentioned fact Example, and drive the screw-down of arbor press by a motor, the present embodiment can realize especially by such as under type:
S1001 judges whether the difference of working roll roll gap desired value or the difference of working roll roll gap actual value are more than or equal to the 3rd value, as the absolute value of the difference of the desired value of the desired value of the roll gap of feed side and the roll gap of exit side, be more than or equal to the 3rd value, perform step S1002; As the absolute value of the difference of the actual value of the actual value of the roll gap of feed side and the roll gap of exit side, be more than or equal to the 3rd value, perform step S1002.
S1002 controls the enable disconnection of frequency converter;
S1003 judges whether the desired value of working roll roll gap is greater than the actual value of working roll roll gap, when desired value is greater than actual value, performs step S1004; When desired value is less than actual value, perform step 1005; When desired value equals actual value, perform step 1002;
S1004 desired value subtracts the difference of actual value and one first value compares, and the first value is the whether enable cut off value of frequency converter.The difference subtracting actual value as desired value is less than or equal to the first value, then perform step S1002; The difference subtracting actual value as desired value is greater than the first value, then perform step S1006;
S1005 actual value subtracts the difference of desired value and one first value compares, and the difference subtracting desired value as actual value is less than or equal to the first value, then perform step S1002; The difference subtracting actual value as desired value is greater than the first value, then perform step S1007;
S1006 judges whether the difference that desired value subtracts actual value is more than or equal to the second value, and the second value is the cut off value of the fast turn-around of Frequency Converter Control motor and microrunning.The difference subtracting actual value as desired value is more than or equal to the second value, then perform step S1010, otherwise, perform step S1011;
S1007 judges whether the difference that actual value subtracts desired value is more than or equal to the second value, and the difference subtracting desired value as actual value is more than or equal to the second value, then perform step S1008; Otherwise, perform step S1009;
S1008 Frequency Converter Control motor rapid adjustment, drives screw-down to decline fast;
S1009 Frequency Converter Control motor adjusts at a slow speed, drives screw-down descending at slow speed;
S1010 Frequency Converter Control motor rapid adjustment, drives screw-down to rise fast;
S1011 Frequency Converter Control motor adjusts at a slow speed, drives screw-down to rise at a slow speed.
Wherein, step 1002 is after control frequency converter enable disconnection, and screw-down rises by inertia or declines, like this at the roll gap of the working roll of arbor press when to desired value, can rely on inertia make its actual value further close to or accurately reach desired value.
Wherein, the second above-mentioned value is generally the 5-20 of the first value doubly, and wherein, the 3rd value, is generally 4-6mm for small-sized arbor press the 3rd value, is generally 6-15mm for big-and-middle-sized arbor press the 3rd value.
In sum, the present invention is by arranging the desired value of input and output material both sides working roll roll gap ideally, compare with the actual value of input and output material both sides working roll roll gap under real-time status, according to comparative result controlled by the motion of motor to screw-down, with dynamic conditioning input and output material both sides working roll gap values between rollers.Also input and output material both sides working roll gap values between rollers is adjusted with regard to achieving by the mode of electrical control, solve existing plate flattening machine, need operating personnel's manually repeatedly repetition test and adjustment reason, thus cause production efficiency to reduce, maloperation easily occur, sheet material leveling effect is undesirable, equipment failure rate and energy consumption increase problem.
Although exemplary embodiment describe the present invention with reference to several, should be appreciated that term used illustrates and exemplary and nonrestrictive term.Spirit of the present invention or essence is not departed from because the present invention can specifically implement in a variety of forms, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and should explain widely in the spirit and scope that claims limit, therefore fall into whole change in claim or its equivalent scope and remodeling and all should be claims and contained.
Claims (8)
1. a mechanical pressure formula plate flattening machine control system, comprises, and at least one screw-down moves for driving the working roll of this arbor press, to adjust the roll gap of the working roll of this arbor press, it is characterized in that,
At least one sensor, is arranged on the roll gap place of the working roll of this arbor press, for sensing the actual value of the roll gap of this working roll;
One programmable logic controller (PLC), can obtain and process the signal of this at least one sensor;
At least one motor, with this at least one screw-down one_to_one corresponding, for controlling this at least one screw-down motion; And
At least one frequency converter, this at least one frequency converter is connected with this programmable logic controller (PLC), and this at least one frequency converter and this at least one motor connect one to one; This frequency converter can receive the control instruction of this programmable logic controller (PLC), to control corresponding this motor connected;
Wherein, the actual value of the roll gap of this working roll and the desired value of roll gap compare and judge by this programmable logic controller (PLC), and control this at least one motor, comprising:
Determine at least one frequency converter that will adjust in this at least one frequency converter;
Judge whether this desired value is greater than this actual value;
When this desired value is greater than this actual value, this screw-down rises, and carries out following action:
This desired value subtracts the difference of this actual value and one first value compares;
The difference subtracting this actual value as this desired value is greater than this first value, judges whether the difference that this desired value subtracts this actual value is more than or equal to one second value; The difference subtracting this actual value as this desired value is more than or equal to this second value, then this at least one frequency converter that will adjust carries out rapid adjustment, and the difference subtracting this actual value as this desired value is less than this second value, then this at least one frequency converter that will adjust adjusts at a slow speed; And
The difference subtracting this actual value as this desired value is less than or equal to this first value, then control the enable disconnection of at least one frequency converter that this will adjust;
When this desired value is less than this actual value, this screw-down declines, and carries out following action:
This actual value subtracts the difference of this desired value and one first value compares;
The difference subtracting this desired value as this actual value is greater than this first value, judges whether the difference that this actual value subtracts this desired value is more than or equal to one second value; The difference subtracting this desired value as this actual value is more than or equal to this second value, then this at least one frequency converter that will adjust carries out rapid adjustment, and the difference subtracting this desired value as this actual value is less than this second value, then this at least one frequency converter that will adjust adjusts at a slow speed; And
The difference subtracting this desired value as this actual value is less than or equal to this first value, then control the enable disconnection of at least one frequency converter that this will adjust; And
When this desired value equals this actual value, this screw-down stops.
2. control system as claimed in claim 1, it is characterized in that, the quantity of this at least one screw-down is two, working roll for the working roll and exit side that drive the feed side of this arbor press respectively moves, and adjusts the working roll of feed side of this arbor press and the roll gap of the working roll of exit side with corresponding respectively;
At least two sensors, this sensor setting at least one is at the feed side working roll roll gap place of this arbor press, this sensor setting at least one at the exit side working roll roll gap place of this arbor press, for the actual value of the roll gap of the working roll of the working roll and exit side that sense this feed side respectively;
The quantity of at least one motor is two, for controlling the motion of this two screw-down respectively.
3. control system as claimed in claim 1, is characterized in that, also comprises an industrial computer, for providing control program to this programmable logic controller (PLC), and transmitting this desired value to this programmable logic controller (PLC).
4. control system as claimed in claim 1, is characterized in that, as the absolute value of the difference of the desired value of the roll gap of the desired value of the roll gap of the working roll of feed side and the working roll of exit side, is more than or equal to one the 3rd value, then controls the enable disconnection of these frequency converters all; As the absolute value of the difference of the actual value of the roll gap of the actual value of the roll gap of the working roll of feed side and the working roll of exit side, be more than or equal to the 3rd value, then control the enable disconnection of these frequency converters all.
5. control system as claimed in claim 1, it is characterized in that, when this desired value is greater than this actual value and the difference that this desired value subtracts this actual value is less than or equal to this first value, then control the enable disconnection of at least one frequency converter that this will adjust, and this screw-down rises by inertia and accurate location; When this desired value is less than this actual value and the difference that this actual value subtracts this desired value is less than or equal to this first value, then control the enable disconnection of at least one frequency converter that this will adjust, and this screw-down declines by inertia and accurate location.
6. control system as claimed in claim 1, is characterized in that, also comprise,
At least one upper limit interlock, is arranged on the limes superiors position place of the roll gap of this working roll, for after this working roll arrives limes superiors position, controls this motor corresponding and stops adjust operation;
At least one lower limit interlock, is arranged on the limit inferior position place of the roll gap of this working roll, for after this working roll arrives limit inferior position, controls this motor corresponding and stops adjust operation.
7. a control method for mechanical pressure formula plate flattening machine, drive the working roll of this arbor press to move by screw-down, to adjust the roll gap of the working roll of this arbor press, it is characterized in that, this control method comprises:
Obtain the actual value of the roll gap of this working roll;
The motor of this screw-down is driven by Frequency Converter Control;
Judge whether the desired value of the roll gap of working roll is greater than this actual value;
When this desired value is greater than this actual value, this screw-down rises, and carries out following action:
This desired value subtracts the difference of this actual value and one first value compares;
The difference subtracting this actual value as this desired value is greater than this first value, judges whether the difference that this desired value subtracts this actual value is more than or equal to one second value; The difference subtracting this actual value as this desired value is more than or equal to this second value, then this frequency converter carries out rapid adjustment, and the difference subtracting this actual value as this desired value is less than this second value, then this frequency converter adjusts at a slow speed; And
The difference subtracting this actual value as this desired value is less than or equal to this first value, then control the enable disconnection of this frequency converter; And
When this desired value is less than this actual value, this screw-down declines, and carries out following action:
This actual value subtracts the difference of this desired value and one first value compares;
The difference subtracting this desired value as this actual value is greater than this first value, judges whether the difference that this actual value subtracts this desired value is more than or equal to one second value; The difference subtracting this desired value as this actual value is more than or equal to this second value, then frequency converter carries out rapid adjustment, and the difference subtracting this desired value as this actual value is less than this second value, then frequency converter adjusts at a slow speed; And
The difference subtracting this desired value as this actual value is less than or equal to this first value, then control the enable disconnection of this frequency converter;
When this desired value equals this actual value, this screw-down stops.
8., as required the control method as described in 7 in right, it is characterized in that,
As the absolute value of the difference of the desired value of the roll gap of the desired value of the roll gap of the working roll of feed side and the working roll of exit side, be more than or equal to one the 3rd value, then control the enable disconnection of this frequency converter; As the absolute value of the difference of the actual value of the actual value of the roll gap of feed side and the roll gap of exit side, be more than or equal to the 3rd value, then control the enable disconnection of this frequency converter;
When this desired value is greater than this actual value and the difference that this desired value subtracts this actual value is less than or equal to this first value, then control the enable disconnection of this frequency converter, and this screw-down rises and locates by inertia; When this desired value is less than this actual value and the difference that this actual value subtracts this desired value is less than or equal to this first value, then control the enable disconnection of this frequency converter, and this screw-down declines and locates by inertia.
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| CN201210510997.6A CN102941249B (en) | 2012-12-03 | 2012-12-03 | Mechanical pressing-type plate straightening machine control system and control method |
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| CN201210510997.6A CN102941249B (en) | 2012-12-03 | 2012-12-03 | Mechanical pressing-type plate straightening machine control system and control method |
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| CN105170705B (en) * | 2015-09-02 | 2017-12-15 | 安徽政平金属科技股份有限公司 | A kind of automatic import levelling machine and its flattening method |
| CN106483845B (en) * | 2016-08-25 | 2019-05-28 | 北京冶自欧博科技发展有限公司 | A kind of method and system improving the forecast of straightener force-power parameter |
| CN109604217B (en) * | 2018-12-20 | 2022-02-15 | 东风小康汽车有限公司重庆分公司 | Method and system for automatically adjusting cleaning roller spacing |
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| CN102126006A (en) * | 2010-01-14 | 2011-07-20 | 宝山钢铁股份有限公司 | Roll gap control method for soft reduction technology for continuous casting |
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