CN106694630A - Profile steel straightening machine and control method thereof - Google Patents
Profile steel straightening machine and control method thereof Download PDFInfo
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- CN106694630A CN106694630A CN201611177877.3A CN201611177877A CN106694630A CN 106694630 A CN106694630 A CN 106694630A CN 201611177877 A CN201611177877 A CN 201611177877A CN 106694630 A CN106694630 A CN 106694630A
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- straightener
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
- B21D3/05—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes rectangular to the path of the work
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a profile steel straightening machine. A straightening production line of the straightening machine (3) comprises a roller bed (6) in front of the straightening machine and a roller bed (10) on the back of the straightening machine, wherein a pinch roller (2) in front of the straightening machine is arranged between the roller bed (6) in front of the straightening machine and the straightening machine (3). A pinch roller (4) on the back of the straightening machine is arranged between the straightening machine (3) and the roller bed (10) on the back of the straightening machine. The invention further discloses a control method of the profile steel straightening machine. By the adoption of the profile steel straightening machine and the control method of the profile steel straightening machine, the two pinch rollers are additionally arranged in front and on the back of the online profile steel straightening machine correspondingly, so that the straightening capacity of the straightening machine is greatly improved; the investment cost is quite low, equipment installation and debugging of the two pinch rollers hardly occupy production time, and a quite economical and efficient improvement method is provided.
Description
Technical field
The invention belongs to the technical field of metallurgical industry production equipment, in particular it relates to the knot of section straightener
Structure and control technology.In addition, the invention further relates to the control method of described section straightener.
Background technology
At present, the section straightener of small H profile steel production line is the roller straightener of cantilevered ten, and 10 smoothing rolls interlock cloth up and down
Put, 5 smoothing rolls below are drive roll, are combined by a frequency conversion motors (400kW) and are driven, and 5 alignings above
Roller is non-drive driven roll.The maximum aligning modulus of section of the straightener is 220cm3.
For the various H profile steels that the production line is rolled, the maximum aligning of straightener permission is respectively less than due to modulus of section
Modulus of section, so, the straightener can complete rectifying for the production line all size kind H profile steel in the case of nonoverload
Directly.
Later, in order to adapt to the demand in market, the rolling kind of the production line is expanded, the production line starts Shi Zha states household electrical appliances
The following equal leg angles of specification of ∠ 250 × 250 × 35 of net demand.Because the specification moduluss of section of ∠ 250 × 250 × 18 are
224.03cm3, and the specification moduluss of section of ∠ 250 × 250 × 35 are 342.33cm3, two kinds of moduluss of section of specification angle steel surpass
Gone out the maximum cross-section modulus of existing online section straightener, so, aligning ∠ 250 × 250 × 18~∠ 250 × 250 ×
During 35 specification equal leg angle, the output torque of the online section straightener transmission mechanism is in overload all the time, especially exists
During aligning 250 × 250 × 35 specification angle steel of ∠, online section straightener main drive motor is sometimes up to or slightly above 175%
Overload clipping state；Also, the main strong roll sleeve retaining mechanism in straightener part frequently occurs damage.
It follows that the online section straightener of the production line do not possess aligning ∠ 250 × 250 × 18~∠ 250 × 250 ×
The ability of 35 specification equal leg angles.
In order that the big specification equal leg angle that the production line is rolled obtains the effective aligning of stabilization, it is generally considered that necessary
A 10 bigger roller straighteners of aligning modulus of section are increased newly to replace existing 10 online roller straighteners.And newly-increased one is cut
The direct investment of 10 bigger roller straighteners of face mould number (including straightener roller set and roller piece etc.) takes around 22,000,000 yuan of people
Coin, and the depreciation loss of the annex such as existing on-line straightening machine and its roller set roller piece is about 10,000,000 yuans, and increase newly
The installation of straightener, debugging construction need the off-time grown very much.
The content of the invention
The present invention provides a kind of section straightener, the problem that is short of power the purpose is to solve existing section straightener.
To achieve these goals, the technical scheme taken of the present invention is：
Section straightener of the invention, the aligning production line of described straightener includes straightener machine front roller-way, straightener
Roller-way after machine, between described straightener machine front roller-way and straightener, sets pinch roll before straightener machine；In described aligning
After machine and straightener machine between roller-way, pinch roll after straightener machine is set.
Before described straightener machine after pinch roll and straightener machine pinch roll using adjustable frequency motor and through reductor pair
It is driven.
Between cold bed runout table exit and described straightener machine front roller-way, a detector is set.
Between pinch roll before described straightener machine front roller-way and straightener machine, No. two detectors are set.
Before described straightener machine between pinch roll and straightener, No. three detectors are set.
No. four detectors are set between roller-way after pinch roll and straightener machine after the described straightener machine.
In order to realize with above-mentioned technical proposal identical goal of the invention, present invention also offers above-described beam straightening
The control method of machine, its technical scheme is：
The control program of described control method includes following control unit：
1st, functional block TXJJNC01 and TXJJNC02 constitutes straightener overload monitoring unit；
2nd, functional block TXJJNC03 constitutes pinch roll (abbreviation PR1) load condition monitoring unit before straightener machine；
3rd, functional block TXJJNC04 constitutes pinch roll (abbreviation PR2) load condition monitoring unit after straightener machine；
4th, functional block TXJJNC05 and TXJJNC06 constitutes straightener light condition monitoring unit；
5th, functional block TXJJNC07, TXJJNC08, TXJJNC10, TXJJNC12, TXJJNC14, TXJJNC20 and
TXJJNC22 constitutes PR1 reference speed correction control units；
6th, functional block TXJJNC07, TXJJNC09, TXJJNC11, TXJJNC13, TXJJNC15, TXJJNC21 and
TXJJNC23 constitutes PR2 reference speed correction control units；
7th, functional block TXJJNC16, TXJJNC17 and TXJJNC18 constitute PR1 reference speed corrections control switching unit；
8th, functional block TXJJNC16, TXJJNC17 and TXJJNC19 constitute PR2 reference speed corrections control switching unit.
Under automated manner, the speed control method of straightener and PR1 and PR2 is：
Rolled piece is that threading speed passes through straightener and pinch roll with low speed；Pinch roll after workpiece front end leaves straightener machine
When, straightener and its front and rear pinch roll synchronous raising speed align speed to normal；And pinched after rolled piece afterbody departs from straightener machine
During roller, pinch roll is synchronously decelerated to rolled piece threading speed after pinch roll and straightener machine after straightener and its straightener machine, waits
Next rolled piece threading aligning；
The straightener overload monitoring unit is obtained first by the overproof detection functional block TXJJNC01 of two-way numerical value
The overload status information of straightener drive motor, and by the overload status information through forward position delay function block TXJJNC02 time delays
3 seconds, speed up time of this time more than straightener；If the overload status information is still present after this section of time delayses,
Then show that straightener transmission mechanism is in stable state overload.
When straightener is specified more than or equal to 110% motor in overload, i.e. straightener drive motor electric current
Electric current, PR1 is in non-overloaded state, i.e. PR1 drive motors electric current and is less than or equal to 95% motor rated current, and
Preceding i.e. No. two detectors of heat inspection of PR1 pick up when, in PR1 reference speed correction control units ' with door ' functional block TXJJNC08
Output state is ' 1 ' so that rotary pulse generator functional block TXJJNC12 is enabled in the unit, at this moment, if PR1 reference speeds
Correction and Control switching unit output is that the output state of functional block TXJJNC18 is ' 1 ', then PR1 reference speed corrections control unit
Counter function block TXJJNC20 start positive accumulated counts, thus make PR1 reference speed correction valuesGradually increase
Greatly, so, PR1 is gradually increased the stress that pushes away that each smoothing roll of straightener applies by rolled piece, until straightener exits overload shape
State, i.e. straightener drive motor electric current are less than or equal to 90% motor rated current, or PR1 drive motors are in and are fully loaded with
State, i.e. PR1 drive motors electric current are more than or equal to 105% motor rated current.
Pinch roll is pressed from both sides after being in non-overloaded state, and straightener machine after straightener is in overload, straightener machine
Send i.e. No. four detectors of heat inspection after roller to pick up when, after straightener machine in pinch roll reference speed correction control unit ' with door ' function
The output state of block TXJJNC09 is ' 1 ' so that rotary pulse generator functional block TXJJNC13 is enabled in the unit, at this moment,
If it is ' 1 ', pinch roll base after straightener machine that pinch roll reference speed correction controls switching unit output state after straightener machine
The counter function block TXJJNC21 of Quasi velosity Correction and Control unit starts positive accumulated counts, is pinched after thus making straightener machine
Roller reference speed correction valueGradually increase, so, pinch roll passes through rolled piece to each smoothing roll of straightener after straightener machine
The tension of applying gradually increases, until pinch roll drive motor is in completely after straightener exits overload or straightener machine
Pinch roll drive motor electric current is more than or equal to 105% motor rated current after load state, i.e. straightener machine.
When straightener is that straightener drive motor electric current is less than or equal to the specified electricity of 70% motor in light condition
Stream, PR1 are in before full load condition, and PR1 No. four detections of heat inspection after pinch roll after heat No. two detectors of inspection and straightener machine
Device pick up when, in PR1 reference speed correction control units ' with door ' functional block TXJJNC10 output state be ' 1 ' so that
Rotary pulse generator functional block TXJJNC14 is enabled in the unit, at this moment, if PR1 reference speed corrections control switching unit is defeated
It is ' 1 ' to do well, then the counter function block TXJJNC20 of PR1 reference speed corrections control unit starts reverse accumulated counts,
Thus it is gradually reduced PR1 reference speed correction values, so, PR1 pushes away stress by rolled piece to what each smoothing roll of straightener applied
It is gradually reduced, until PR1 drive motors exit full load condition, i.e. PR1 drive motors electric current less than or equal to 95% electronic
Machine rated current；Or straightener reaches full load condition, i.e. straightener drive motor electric current and reaches the specified electricity of 100% motor
Stream.
Pinch roll is in No. two inspections of heat inspection before full load condition, and PR1 after straightener is in light condition, straightener machine
Survey after device and straightener machine heat No. four detectors of inspection after pinch roll pick up when, pinch roll reference speed correction after straightener machine
' with door ', the output state of functional block TXJJNC11 is ' 1 ' in control unit so that rotary pulse generator function in the unit
Block TXJJNC15 is enabled, at this moment, if it is ' 1 ' that pinch roll reference speed correction controls switching unit output state after straightener machine,
Then the counter function block TXJJNC21 of pinch roll reference speed correction control unit starts reverse accumulated counts after straightener machine,
Thus pinch roll reference speed correction value is gradually reduced after making straightener machine, and so, pinch roll passes through rolled piece pair after straightener machine
The tension that each smoothing roll of straightener applies is gradually reduced, until pinch roll drive motor exits fully loaded shape after straightener machine
Pinch roll drive motor electric current is less than or equal to 95% motor rated current after state, i.e. straightener machine；Or straightener reaches
Full load condition；
Thus obtain：Controlled by the tensile stress between section straightener and its front and rear pinch roll, that is, improve section straightener
Straightening capacity.
The present invention uses above-mentioned technical proposal, and a pinch roll is respectively increased before and after online section straightener, substantially increases
The straightening capacity of straightener, the investment cost of the program is very low, and two equipment installation and debugging of pinch roll are substantially not
The production time is taken, is a kind of extremely economic, efficient remodeling method.
Brief description of the drawings
Mark in accompanying drawing content and figure is briefly described as follows：
Fig. 1 is small H profile steel straightener of the invention and front and rear pinch roll layout drawing；
Fig. 2 is the aligning load diagram of the angle steel of ∠ of the invention 250 × 250 × 32；
Fig. 3 is the control program of raising section straightener straightening capacity of the invention；
Fig. 4 is n-th lower smoothing roll moment of torsion and distribution of force figure of section straightener of the invention；
Fig. 5 is pinch roll moment of torsion distribution map before and after section straightener of the invention；
Fig. 6 is beam straightening mechanism driving torque amplitude limit control program structure chart of the invention.
Marked in figure：
1st, rolled piece, 2, pinch roll before straightener machine, 3, straightener, 4, pinch roll after straightener machine, 5, detector, 6,
Straightener machine front roller-way, 7, No. two detectors, 8, No. three detectors, 9, No. four detectors, 10, roller-way after straightener machine.
Specific embodiment
Below against accompanying drawing, by the description to embodiment, further details of is made to specific embodiment of the invention
Illustrate there is more complete, accurate and deep reason to inventive concept of the invention, technical scheme to help those skilled in the art
Solution.
Structure of the invention as shown in Figure 1, is a kind of section straightener.The aligning production line bag of described straightener 3
Include roller-way 10 after straightener machine front roller-way 6, straightener machine.
The invention solves the problems that first problem be：
In order to overcome the defect of prior art, the invention mesh of the problem that is short of power of the existing section straightener of solution is realized
, the technical scheme that the present invention takes is：
As shown in figure 1, section straightener of the invention, between described straightener machine front roller-way 6 and straightener 3, if
Put pinch roll 2 before straightener machine；Between roller-way 10 after described straightener 3 and straightener machine, pinched after straightener machine is set
Roller 4.
Pinch roll can use identical structure before and after straightener.Generally, pinch roll is driven by adjustable frequency motor through reductor,
The size of pinch roll variable-frequency electric acc power depends on the push-and-pull stress and speed of required pinch roll.
For the specifications of 250 × 250 × 18~∠ of the online section straightener aligning ∠ of small H profile steel production line 250 × 250 × 35
Institute's produced problem during equal leg angle, the invention provides a kind of method for improving section straightener straightening capacity.
For pinch roll before and after straightener, no matter its structure, as long as under the clamped condition of rolled piece 1, can be to rolling
Part 1 applies certain to push away stress or tension.
In view of online section straightener main drive motor power is 400kW, and advised in aligning ∠ 250 × 250 × 35
During lattice angle steel, its output current be sometimes up to or slightly above 175% overload clipping state, therefore, the present invention provide raising
The method of section straightener straightening capacity, it is only necessary to respectively increase a pinch roll before and after existing straightener；Every pinch roll
Driven motor acc power be 110kW, you can existing straightener is possessed the aligning specifications of ∠ 250 × 250 × 35 such as the following corner
The ability of steel, and the investment cost of every pinch roll is only 1,200,000 yuans.
As shown in Figure 2：The aligning load of the angle steel of ∠ 250 × 250 × 32, for Ma Gang little H profile steels straightener in aligning ∠
The heavy overload problem that the specification equal leg angles of 250 × 250 × 18~∠ 250 × 250 × 35 occur, is keeping existing online strong
In the case that straight machine is totally constant, a pinch roll is respectively increased before and after existing section straightener；By adjusting this two folders
The speed of roller is sent, pinch roll is passed through rolled piece 1 and push-and-pull action is produced to each smoothing roll of straightener, straightener is mitigated with this each strong
The transmission output torque of straight roller roll shaft, that is, mitigate the output torque of straightener transmission mechanism.
Using the technical scheme, pinch roll is mitigating the same of each smoothing roll transmission output torque of straightener before and after straightener
When, the bending resistance square ability of each smoothing roll can be also properly increased, the heavy overload of straightener geartrain components thus can be avoided to ask
Topic.
Before described straightener machine after pinch roll 2 and straightener machine pinch roll 4 using adjustable frequency motor and through reductor
It is driven.
Between cold bed runout table exit and described straightener machine front roller-way 6, a detector 5 (No. 1 is set
CMD)。
Between pinch roll 2 before described straightener machine front roller-way 6 and straightener machine, No. two detectors 7 (No. 2 are set
CMD)。
Before described straightener machine between pinch roll 2 and straightener 3, No. three detectors 8 (No. 3 CMD) are set.
No. four detectors 9 (No. 4 are set between roller-way 10 after pinch roll 4 and straightener machine after the described straightener machine
CMD)。
In order to realize with above-mentioned technical proposal identical goal of the invention, present invention also offers above-described beam straightening
The control method of machine, its technical scheme is：
After pinch roll before and after selecting good straightener, how existing on-line straightening is improved using pinch roll before and after straightener
The straightening capacity of machine, the present invention has been provided independently a kind of control program for improving section straightener straightening capacity, its control journey
Sequence structure figure is illustrated in fig. 3 shown below.
As shown in Figure 3：Improve the control program of section straightener straightening capacity.In figure 3 above, LVM is for " two-way numerical value surpasses
Difference detection " functional block；
As X >=M+HY, QU is that ' 1 ', QL is ' 0 '；
As M-HY ＜ X ＜ M+HY, QU and QL keeps ortho states；
As X≤M-HY, QU is that ' 0 ' QL is ' 1 '；
CTR is " bidirectional counter " functional block, and IU and ID is respectively forward backward counter pulse input end, and R and S is respectively meter
The reset terminal of counter count value and setting end, SV is the setting value of counter, and LU and LL is respectively the upper and lower of counter
Limit, Y is counter output end；
BBF is rotary pulse generator, and pulse width is T, the pulse period is 2T；OR is OR-gate；AND is AND gate；
NOT is inverter；PDE is " forward position time delay " functional block；MUL is " multiplier " functional block.
Its design of this control program for improving section straightener straightening capacity and control thought are as follows：
The control program of described control method includes following control unit：
1st, functional block TXJJNC01 and TXJJNC02 constitutes straightener overload monitoring unit；
2nd, functional block TXJJNC03 constitutes pinch roll 2 (abbreviation PR1) load condition monitoring unit before straightener machine；
3rd, functional block TXJJNC04 constitutes pinch roll 4 (abbreviation PR2) load condition monitoring unit before and after straightener machine；
4th, functional block TXJJNC05 and TXJJNC06 constitutes straightener light condition monitoring unit；
5th, functional block TXJJNC07, TXJJNC08, TXJJNC10, TXJJNC12, TXJJNC14, TXJJNC20 and
TXJJNC22 constitutes PR1 reference speed correction control units；
6th, functional block TXJJNC07, TXJJNC09, TXJJNC11, TXJJNC13, TXJJNC15, TXJJNC21 and
TXJJNC23 constitutes PR2 reference speed correction control units；
7th, functional block TXJJNC16, TXJJNC17 and TXJJNC18 constitute PR1 reference speed corrections control switching unit；
8th, functional block TXJJNC16, TXJJNC17 and TXJJNC19 constitute PR2 reference speed corrections control switching unit.
Straightener overload monitoring unit described in 1 above：Realize that straightener is passed using pinch roll before and after straightener
The load regulation and control of motivation structure, to improve the straightening capacity of straightener, this has to judge whether straightener transmission mechanism is located first
In overload.So, straightener transmission mechanism overload monitoring unit is provided with the control program.
Under automated manner, the speed control method of straightener 3 and PR1 and PR2 is：
Rolled piece 1 passes through straightener 3 and pinch roll with low speed (i.e. threading speed)；When the head of rolled piece 1 leaves PR2, aligning
Machine 3 and its front and rear pinch roll synchronous raising speed align speed to normal；And when the afterbody of rolled piece 1 departs from PR2, straightener 3 and its PR1
The threading speed of rolled piece 1 is synchronously decelerated to PR2, the next threading of rolled piece 1 aligning is waited；
Generally there was only 2 by threading speed raising speed to the time of normal aligning speed in view of straightener and its front and rear pinch roll
Second, and during straightener accelerates, because the coefficient of sliding friction between smoothing roll and rolled piece 1 changes larger, cause
Straightener load torque fluctuation is larger, so, is difficult to complete straightener in short-term on programmable logic controller (i.e. PLC)
Dynamic load regulates and controls.
Therefore, the control program does not consider the load regulation and control in the of short duration boosting velocity procedure of straightener, it is set in control program
Overload of the vertical straightener transmission mechanism overload monitoring unit only to straightener under stable state aligning speed is supervised
Survey.
The straightener overload monitoring unit is obtained first by the overproof detection functional block TXJJNC01 of two-way numerical value
The overload status information of straightener drive motor, and by the overload status information through forward position delay function block TXJJNC02 time delays
3 seconds, speed up time of this time more than straightener；If the overload status information is still present after this section of time delayses,
Then show that straightener transmission mechanism is in stable state overload.
When straightener is in overload, (i.e. straightener drive motor electric current is specified more than or equal to 110% motor
Electric current), PR1 be in non-overloaded state (i.e. PR1 drive motors electric current be less than or equal to 95% motor rated current), and
Preceding i.e. No. two detectors 7 (No. 2 CMD) of heat inspection of PR1 pick up when, in PR1 reference speed correction control units ' with door ' functional block
The output state of TXJJNC08 is ' 1 ' so that rotary pulse generator functional block TXJJNC12 is enabled in the unit, at this moment, if
It is ' 1 ' that PR1 reference speed corrections control switching unit to export the i.e. output state of functional block TXJJNC18, then PR1 reference speeds
The counter function block TXJJNC20 of Correction and Control unit starts positive accumulated counts, thus makes PR1 reference speed correction valuesGradually increase, so, PR1 is gradually increased the stress that pushes away that each smoothing roll of straightener applies by rolled piece 1, until rectifying
Straight machine exits overload (i.e. straightener drive motor electric current is less than or equal to 90% motor rated current) or PR1 transmissions
Motor is in full load condition (i.e. PR1 drive motors electric current is more than or equal to 105% motor rated current).
Similarly, non-overloaded state is in when straightener is in overload, PR2, and heat inspection is No. four detectors after PR2
9 (No. 4 CMD) pick up when, in PR2 reference speed correction control units ' with door ' functional block TXJJNC09 output state be ' 1 ',
So that rotary pulse generator functional block TXJJNC13 is enabled in the unit, at this moment, if PR2 reference speed corrections control switching list
First output state is ' 1 ', then the counter function block TXJJNC21 of PR2 reference speed corrections control unit starts positive cumulative meter
Number, thus makes PR2 reference speed correction valuesGradually increase, so, PR2 is applied by rolled piece 1 to each smoothing roll of straightener
Plus tension gradually increase, until straightener exits overload or PR2 drive motors and is in full load condition (i.e. PR2 is passed
Dynamic motor current is more than or equal to 105% motor rated current).
When straightener is in light condition, (i.e. straightener drive motor electric current is less than or equal to the specified electricity of 70% motor
Stream), PR1 be in full load condition, and PR1 before heat inspection No. two detectors 7 (No. 2 CMD) and PR2 after heat inspection No. four detectors 9
(No. 4 CMD) pick up when, ' with door ', the output state of functional block TXJJNC10 is in PR1 reference speed correction control units
' 1 ' so that rotary pulse generator functional block TXJJNC14 is enabled in the unit, at this moment, if the control of PR1 reference speed corrections is thrown
Cut unit output state is ' 1 ', then the counter function block TXJJNC20 of PR1 reference speed corrections control unit starts reversely tired
Plus count, thus it is gradually reduced PR1 reference speed correction values, so, PR1 is applied by rolled piece 1 to each smoothing roll of straightener
The stress that pushes away be gradually reduced, until PR1 drive motors exit full load condition, and (i.e. PR1 drive motors electric current is less than or equal to
95% motor rated current) or straightener reach full load condition (i.e. straightener drive motor electric current reach 100% motor
Rated current).
When straightener is in No. two detectors 7 (No. 2 CMD) of heat inspection before light condition, PR2 are in full load condition, and PR1
And after PR2 No. four detectors 9 (No. 4 CMD) of heat inspection pick up when, in PR2 reference speed correction control units ' with door ' function
The output state of block TXJJNC11 is ' 1 ' so that rotary pulse generator functional block TXJJNC15 is enabled in the unit, at this moment,
If PR2 reference speed corrections control the counter that switching unit output state is ' 1 ', PR2 reference speed correction control units
Functional block TXJJNC21 starts reverse accumulated counts, is thus gradually reduced PR2 reference speed correction values, and so, PR2 is by rolling
Part 1 is gradually reduced to the tension that each smoothing roll of straightener applies, until PR2 drive motors exit full load condition, and (i.e. PR2 is passed
Dynamic motor current is less than or equal to 95% motor rated current) or straightener reach full load condition；
It can thus be appreciated that：Controlled by the tensile stress between section straightener and its front and rear pinch roll, you can improve beam straightening
The straightening capacity of machine.
The invention solves the problems that Second Problem be：
It is in order to avoid section straightener transmission mechanism is normally being aligned to increase pinch roll purpose before and after section straightener
Occur driving torque overload during big specification shaped steel, but, when shaped steel to be aligned because size or shape anomaly (such as in shaped steel and are extended out
Deng) and cause straightener transmission mechanism align moment of torsion heavy overload when, in this case, if section straightener by itself
The push-and-pull action of short-time overload capacity and front and rear pinch roll still makes the shaped steel be aligned in straightener, and this will cause aligning
Owner rectifys area's smoothing roll roll shaft and its bearing block is damaged because its vertical shear is excessive.
Therefore, for the beam straightening mechanism with front and rear pinch roll, it is common by straightening machine body and its front and rear pinch roll
The beam straightening moment of torsion of generation must be controlled within the scope of the maximum allowable output torque of straightening machine body, or is slightly surpassed a bit.
In this regard, the invention provides a kind of control method of the beam straightening mechanism driving torque amplitude limit with front and rear pinch roll：
N-th lower smoothing roll moment of torsion of section straightener and distribution of force figure are as shown in Figure 4.
In fig. 4：
It is the smoothing roll rotating speed；
Tidle.STRIt is the smoothing roll no-load running moment of torsion；
Tplastic.STRFor the smoothing roll makes shaped steel produce the shaped steel plastic deformation of the moment of torsion of plastic deformation, i.e. smoothing roll to turn round
Square；
TD.STRIt is the electromagnetic torque of aligning roller transmission mechanism output；
Tσ.PR1And Tσ.PR2The tensile stress moment of torsion that pinch roll is applied by shaped steel to the smoothing roll respectively before and after straightener,
Under pinch roll normal operation before and after straightener, Tσ.PR1And Tσ.PR2And TD.STRIt is equidirectional；
FLHΣ.STRHorizontal direction running resistance suffered when being contacted with shaped steel for the smoothing roll；
Fσ.PR1And Fσ.PR2The tensile stress that pinch roll is applied by shaped steel to the smoothing roll respectively before and after straightener；
FD.STRIt is the electromagnetic force of aligning roller transmission mechanism output；
FLV.STRVertical direction shearing force suffered when being contacted with shaped steel for the smoothing roll.
Pinch roll moment of torsion distribution map is as shown in figure 5 above before and after section straightener.
In Figure 5：
nPRIt is pinch roll rotating speed；
Tidle.PR1And Tidle.PR2The no-load running moment of torsion of pinch roll respectively before and after straightener；
Tσ1.STRAnd Tσ2.STRThe tensile stress moment of torsion that respectively straightener roll of straightener applies to pinch roll before and after straightener, is rectifying
Before and after straight machine under pinch roll normal operation, Tσ1.STRWith TD.PR1In the opposite direction, Tσ2.STRWith TD.PR2In the opposite direction；
Telastic.PR1And Telastic.PR2Pinch roll clamps shaped steel and shaped steel is produced elastic deformation respectively before and after straightener
Moment of torsion, i.e., the shaped steel elastic deformation moment of torsion of pinch roll before and after straightener；
TD.PR1And TD.PR2The electromagnetic torque of roller transmission mechanism output is respectively pinched before and after straightener.
As shown in Figure 4, in shaped steel normal steady state straightening process, the section steel plastic of smoothing roll no-load running moment of torsion and smoothing roll
Property deforming torsional direction it is identical, pinch roll applies to smoothing roll before and after straightener tensile stress moment of torsion and aligning roller transmission mechanism
The direction of the electromagnetic torque of output is identical, and Tidle.STRAnd Tplastic.STRSum is equal to Tσ.PR1、Tσ.PR2And TD.STRSum.
Knowable to the force analysis of smoothing roll, the tensile stress (F that pinch roll applies to smoothing roll before and after straightenerσ.PR1With
Fσ.PR2), three sum and smoothing roll horizontal direction running resistance identical with the direction of the electromagnetic force that aligning roller transmission mechanism is exported
It is equal in magnitude in opposite direction；Smoothing roll horizontal direction running resistance and smoothing roll no-load running moment of torsion and the section steel plastic of smoothing roll
Property deforming torsional sum be directly proportional, pinch roll pair before and after the tensile stress that pinch roll applies to smoothing roll before and after straightener and straightener
The tensile stress moment of torsion that smoothing roll applies is directly proportional, electromagnetic force and the aligning roller transmission mechanism output of aligning roller transmission mechanism output
Electromagnetic torque is directly proportional.
So, when smoothing roll horizontal direction running resistance (or smoothing roll load) is excessive, by adjusting straightener before and after
The tensile stress size that pinch roll applies to smoothing roll, the electromagnetic force for exporting aligning roller transmission mechanism maintains certain scope
It is interior, so that the electromagnetic torque of aligning roller transmission mechanism output is able to maintain that in certain scope.This is that is, by rectifying
Tensile stress effect of the pinch roll to smoothing roll can avoid the problem of straightener transmission mechanism torque overload before and after straight machine.
For smoothing roll vertical direction shearing force, from Fig. 4 smoothing roll distribution of force figures, the vertical direction of smoothing roll is cut
Plastic deformation moment of torsion sum of the shear force equally to smoothing roll no-load running moment of torsion and smoothing roll is directly proportional, but, due to aligning
The tensile stress that pinch roll applies to smoothing roll before and after machine is perpendicular with the vertical direction shearing force of smoothing roll, so, before straightener
The tensile stress that pinch roll applies to smoothing roll afterwards can not only adjust the vertical direction shearing force of smoothing roll, on the contrary when treating aligning type
Steel causes smoothing roll to align moment of torsion (to be equal to T because of size or shape anomaly (such as in shaped steel and extend out)idle.STRWith
Tplastic.STRSum) heavy overload when, in this case, if beam straightening roller by the short-time overload capacity of transmission mechanism with
And the push-and-pull action of pinch roll still makes the shaped steel be aligned in smoothing roll before and after straightener, this will cause aligning owner to rectify area
Smoothing roll roll shaft and its bearing block are excessive and damage because bearing vertical shear.So, for section straightener body and its preceding
Afterwards pinch roll set into beam straightening mechanism, its actual straightening moment of torsion must be controlled in the maximum allowable output of section straightener body
Within the scope of moment of torsion.
Therefore, the invention provides a kind of control journey of the beam straightening mechanism driving torque amplitude limit with front and rear pinch roll
Sequence (or control method), its control program structure chart is as shown in Figure 6.
In figure 6：
NSW is " digital change-over switch " functional block, as I=' 1 ', Y=X2, and as I=' 0 ', Y=X1；
NCM is " numeric ratio compared with " functional block, and as X1 ＞ X2, QU is ' 1 ', and as X1=X2, QE is ' 1 ', as X1 ＜ X2
When, QL is ' 1 '；
RSR is " reset terminal R preferential rest-set flip-flop " functional block, and when it is ' 0 ' that S is ' 1 ', R, Q is that ' 1 ', QN is ' 0 ',
When it is ' 1 ' that S is ' 1 ', R, Q is that ' 0 ', QN is ' 1 ', and when it is ' 0 ' that S is ' 0 ', R, Q and QN keeps ortho states, as S for ' 0 ', R is
When ' 1 ', Q is that ' 0 ' QN is ' 1 '；
SUB is " subtracter " functional block, Y=X1-X2；OR is OR-gate；
AND is AND gate；
NOT is inverter；
Iq.PR1.actAnd Iq.PR1.NPinch roll driving motor actual current torque component is (right respectively before section straightener machine
Answer pinch roll driving motor reality output moment of torsion before straightener machine) and (pinch before correspondence straightener machine of rated current torque component
Roller driving motor nominal torque)；
Iq.PR2.actAnd Iq.PR2.NPinch roll driving motor actual current torque component is (right respectively after section straightener machine
Answer pinch roll driving motor reality output moment of torsion after straightener machine) and (pinch after correspondence straightener machine of rated current torque component
Roller driving motor nominal torque)；
Iq.STR.actAnd Iq.STR.NRespectively (correspondence straightener is passed section straightener driving motor actual current torque component
Dynamic motor reality output moment of torsion) and rated current torque component (correspondence straightener driving motor nominal torque).
This its design of driving torque amplitude limit control program of beam straightening mechanism and control thought with front and rear pinch roll
It is as follows：
The control program is mainly made up of four control units, i.e.,：
1st, the corresponding folder of pinch roll tensile stress moment of torsion before the straightener machine that functional block JJXJNXC01~JJXJNXC03 is constituted
Send roller driving motor electric current torque component (Iσ.PR1.act) computing unit；
2nd, the corresponding folder of pinch roll tensile stress moment of torsion after the straightener machine that functional block JJXJNXC04~JJXJNXC06 is constituted
Send roller driving motor electric current torque component (Iσ.PR2.act) computing unit；
3rd, the corresponding aligning of beam straightening mechanism actual straightening moment of torsion that functional block JJXJNXC07~JJXJNXC09 is constituted
Machine driving motor electric current torque component (Iq.PSTR.act) computing unit；
4th, the corresponding straightener of beam straightening mechanism aligning moment of torsion that functional block JJXJNXC10~JJXJNXC16 is constituted is passed
Dynamic current of electric torque component (Iq.PSTR.act) heavy overload monitoring unit.
It will be appreciated from fig. 6 that during pinch roll normal work and straightener stable state are aligned before and after the section straightener, rectifying
Before and after straight machine the load torque of pinch roll it is main by pinch roll no-load running moment of torsion, the shaped steel elastic deformation moment of torsion of pinch roll and
The part of tensile stress moment of torsion three composition that section straightener smoothing roll applies to pinch roll before and after straightener.
The no-load running moment of torsion of pinch roll leads to the big I of pinch roll shaped steel elastic deformation moment of torsion sum before and after straightener
Cross pinch roll clamping shaped steel and obtained without the pinch roll driving motor actual current torque component under tensile stress output state.
Small H profile steel straightening mechanism for Ma Gang, the no-load running moment of torsion of pinch roll and pinch roll shaped steel before and after straightener
Elastic deformation moment of torsion sum is about that 30% pinch roll driving motor nominal torque (corresponds to 30% pinch roll driving motor specified
Electric current torque component).
So, the corresponding pinch roll driving motor electric current torque component of pinch roll tensile stress moment of torsion is calculated before straightener machine
In unit, by pinch roll driving motor actual current torque component I before section straightenerq.PR1.actIt is driven with 30% pinch roll
Rated motor electric current torque component (i.e. 30%Iq.PR1.N) difference obtain straightener machine before the corresponding folder of pinch roll tensile stress moment of torsion
Send roller driving motor electric current torque component (Iσ.PR1.act)。
In view of pinch roll tensile stress moment of torsion is only more than in pinch roll driving motor electric current torque component before straightener machine
30%Iq.PR1.NWhen just occur, conversely, pinch roll tensile stress torque output is zero before straightener machine, so, the unit passes through
Digital change-over switch functional block JJXJNXC03 controls the defeated of the corresponding current of electric torque component of pinch roll tensile stress moment of torsion
Go out；Work as Iq.PR1.actLess than 30%Iq.PR1.NWhen, the corresponding current of electric torque component I of pinch roll tensile stress moment of torsionσ.PR1.actFor
Zero, conversely, Iσ.PR1.actEqual to Iq.PR1.actWith 30%Iq.PR1.NDifference.
Equally, for pinch roll after straightener machine, the corresponding pinch roll driving motor electric current moment of torsion point of its tensile stress moment of torsion
Amount computing unit controls the corresponding current of electric of pinch roll tensile stress moment of torsion by digital change-over switch functional block JJXJNXC06
The output of torque component；Work as Iq.PR2.actLess than 30%Iq.PR2.NWhen, the corresponding current of electric moment of torsion point of pinch roll tensile stress moment of torsion
Amount Iσ.PR2.actIt is zero, conversely, Iσ.PR2.actEqual to Iq.PR2.actWith 30%Iq.PR2.NDifference.
Also known by Fig. 6, (i.e. beam straightening mechanism is actual rectifys the aligning moment of torsion that section straightener smoothing roll is actually born
Straight moment of torsion) it is equal to Tσ.PR1、Tσ.PR2And TD.STRSum, and Tσ.PR1And Tσ.PR2Correspond respectively to Iσ.PR1.actAnd Iσ.PR2.act,
TD.STRCorresponding to Iq.STR.act, so, the aligning moment of torsion that section straightener smoothing roll is actually born can be by Iσ.PR1.act、
Iσ.PR2.actAnd Iq.STR.actThree's sum is obtained.
In view of Iσ.PR1.actAnd Iσ.PR2.actNumerical value be pinch roll driving motor rated current torque component Iq.PR.N(=
Iq.PR1.N=Iq.PR2.N) percentage, and Iq.STR.actNumerical value be straightener driving motor rated current torque component Iq.STR.N
Percentage, so, in order to pass through pinch roll and section straightener driving motor actual current moment of torsion before and after section straightener
Component calculates the shaped steel straightener roll of straightener actually aligning moment of torsion that is born, need to be by Iσ.PR1.actWith Iσ.PR2.actSum is (i.e.
Iσ.ΣPR.act) be converted to straightener driving motor rated current torque component Iq.STR.NFor percentage numerical value (i.e.
Iσ.STR.act)。
Pinch roll driving motor power is 132KW, section straightener driving motor work(before and after Ma Gang little H profile steel straighteners
Rate is 400KW, and the speed reducing ratio of pinch roll transmission speed reducer is identical with the speed reducing ratio of straightener transmission speed reducer before and after straightener, together
When pinch roll roll neck it is roughly the same with straightener roll of straightener roll neck, so by Iσ.ΣPR.actIt is multiplied by 33% (=132KW/400KW)
I can be converted toσ.STR.act, by Iσ.STR.actWith Iq.STR.actIt is cumulative to obtain beam straightening mechanism actual straightening moment of torsion correspondence
Straightener driving motor electric current torque component Iq.PSTR.act。
The corresponding straightener transmission electricity of beam straightening mechanism actual straightening moment of torsion in the driving torque amplitude limit control program
Electromechanics stream torque component (Iq.PSTR.act) computing unit is based on this and designs.
The section straightener actuator motor electric current torque component amplitude limit value is 180%Iq.STR.N, it is normal in straightener
In straightening process, straightener driving motor torque component only is possible to reach in the band after straightener stings steel carries boosting velocity procedure
Its torque component amplitude limit value, so, in the corresponding straightener driving motor electric current torque component of beam straightening mechanism aligning moment of torsion
(Iq.PSTR.act) in heavy overload monitoring unit, monitored by two values comparing function block JJXJNXC10 and JJXJNXC12
The heavy overload state of moment of torsion is aligned by beam straightening mechanism, works as Iq.PSTR.actMore than 180%Iq.STR.NAnd the duration is more than 2
Second (straightener maximum belt carries speed up time), or work as Iq.PSTR.actMore than 190%Iq.STR.NAnd the duration is more than 150 millis
Second (control system circulation time), then the monitoring unit is to pinch roller drive arrangement and straightener transmission device before and after straightener
Running blocking order is sent, to ensure straightener roll of straightener roll shaft and its bearing block from impaired.
Implementation result：A kind of beam straightening mechanism driving torque limiting control method with front and rear pinch roll of the invention
(or control program) has put into Ma Gangsan steel rolls small H profile steel the straightener control system and has used, and practical effect is fine.
The present invention is exemplarily described above in conjunction with accompanying drawing, it is clear that the present invention is implemented and do not receive aforesaid way
Limitation, as long as employing the improvement of various unsubstantialities that method of the present invention design and technical scheme are carried out, or without changing
Enter and design of the invention and technical scheme are directly applied into other occasions, within protection scope of the present invention.
Claims (10)
1. a kind of section straightener, the aligning production line of described straightener (3) includes straightener machine front roller-way (6), straightener
Roller-way (10) after machine, it is characterised in that：Between described straightener machine front roller-way (6) and straightener (3), straightener machine is set
Preceding pinch roll (2)；Between roller-way (10) after described straightener (3) and straightener machine, pinch roll after straightener machine is set
(4)。
2. according to the section straightener described in claim 1, it is characterised in that：Before described straightener machine pinch roll (2) and rectify
Pinch roll (4) is driven using adjustable frequency motor and through reductor to it after straight machine machine.
3. according to the section straightener described in claim 1, it is characterised in that：Rectified with described in cold bed runout table exit
Between straight machine machine front roller-way (6), a detector (5) is set.
4. according to the section straightener described in claim 1, it is characterised in that：Described straightener machine front roller-way (6) with rectify
Before straight machine machine between pinch roll (2), No. two detectors (7) are set.
5. according to the control method of the section straightener described in Claims 1-4, it is characterised in that：Described control method
Control program includes following control unit：
1), functional block TXJJNC01 and TXJJNC02 constitutes straightener overload monitoring unit；
2), functional block TXJJNC03 constitutes pinch roll (2) load condition monitoring unit before straightener machine；
3), functional block TXJJNC04 constitutes pinch roll (4) load condition monitoring unit after straightener machine；
4), functional block TXJJNC05 and TXJJNC06 constitutes straightener light condition monitoring unit；
5), functional block TXJJNC07, TXJJNC08, TXJJNC10, TXJJNC12, TXJJNC14, TXJJNC20 and
TXJJNC22 constitutes pinch roll (2) reference speed correction control unit before straightener machine；
6), functional block TXJJNC07, TXJJNC09, TXJJNC11, TXJJNC13, TXJJNC15, TXJJNC21 and
TXJJNC23 constitutes pinch roll (4) reference speed correction control unit after straightener machine；
7), functional block TXJJNC16, TXJJNC17 and TXJJNC18 constitute pinch roll (2) reference speed correction before straightener machine
Control switching unit；
8), functional block TXJJNC16, TXJJNC17 and TXJJNC19 constitute pinch roll (4) reference speed correction after straightener machine
Control switching unit.
6. according to the control method of the section straightener described in claim 5, it is characterised in that：Under automated manner, straightener
(3) speed control method of pinch roll (4) is after pinch roll (2) and straightener machine and before straightener machine：
Rolled piece (1) is that threading speed passes through straightener (3) and pinch roll with low speed；After rolled piece (1) head leaves straightener machine
During pinch roll (4), straightener (3) and its front and rear pinch roll synchronous raising speed align speed to normal；And treat rolled piece (1) afterbody and depart from
After straightener machine during pinch roll (4), pinch roll (4) is same after pinch roll (2) and straightener machine before straightener (3) and its straightener machine
Step is decelerated to rolled piece (1) threading speed, waits next rolled piece (1) threading aligning；
The straightener overload monitoring unit is aligned first by the overproof detection functional block TXJJNC01 of two-way numerical value
The overload status information of machine drive motor, and by the overload status information through forward position delay function block TXJJNC02 time delay 3 seconds
Clock, speed up time of this time more than straightener；If the overload status information is still present after this section of time delayses, table
Bright straightener transmission mechanism is in stable state overload.
7. according to the control method of the section straightener described in claim 5, it is characterised in that：
It is more than or equal to 110% motor rated current when straightener is in overload, i.e. straightener drive motor electric current,
Pinch roll (2) pinch roll (2) drive motor electric current before non-overloaded state, i.e. straightener machine is less than or waits before straightener machine
In 95% motor rated current, and before straightener machine preceding i.e. No. two detectors (7) of heat inspection of pinch roll (2) pick up when, rectify
The output state of ' with door ' functional block TXJJNC08 is ' 1 ' in pinch roll (2) reference speed correction control unit before straight machine machine, is made
Rotary pulse generator functional block TXJJNC12 is enabled in obtaining the unit, at this moment, if pinch roll (2) reference speed before straightener machine
Correction and Control switching unit output is that the output state of functional block TXJJNC18 is ' 1 ', then pinch roll (2) benchmark before straightener machine
The counter function block TXJJNC20 of speed Correction and Control unit starts positive accumulated counts, thus makes pinch roll before straightener machine
(2) reference speed correction valueGradually increase, so, before straightener machine pinch roll (2) by rolled piece (1) to straightener
The stress that pushes away that each smoothing roll applies gradually increases, until straightener to exit overload, i.e. straightener drive motor electric current small
In or equal to 90% motor rated current, or before straightener machine, pinch roll (2) drive motor is in full load condition, that is, align
Pinch roll (2) drive motor electric current is more than or equal to 105% motor rated current before machine machine.
8. according to the control method of the section straightener described in claim 5, it is characterised in that：
Pinch roll (4) is pinched after non-overloaded state, and straightener machine after straightener is in overload, straightener machine
Roller (4) afterwards heat inspection i.e. No. four detectors (9) pick up when, after straightener machine in pinch roll (4) reference speed correction control unit ' with
Door ' functional block TXJJNC09 output state be ' 1 ' so that rotary pulse generator functional block TXJJNC13 makes in the unit
Can, at this moment, if it is ' 1 ', straightener machine that pinch roll (4) reference speed correction controls switching unit output state after straightener machine
The counter function block TXJJNC21 of pinch roll (4) reference speed correction control unit starts positive accumulated counts afterwards, thus makes
Pinch roll (4) reference speed correction value after straightener machineGradually increase, so, pinch roll (4) passes through after straightener machine
Rolled piece (1) gradually increases the tension that each smoothing roll of straightener applies, until straightener exits overload or straightener machine
Pinch roll (4) drive motor electric current is more than or waits after pinch roll (4) drive motor is in full load condition, i.e. straightener machine afterwards
In 105% motor rated current.
9. according to the control method of the section straightener described in claim 5, it is characterised in that：
When straightener be in light condition (i.e. straightener drive motor electric current be less than or equal to 70% motor rated current),
Before straightener machine pinch roll (2) before pinch roll (2) before full load condition, and straightener machine heat inspection No. two detectors (7) with
And after straightener machine pinch roll (4) afterwards No. four detectors (9) of heat inspection pick up when, pinch roll (2) reference speed before straightener machine
' with door ', the output state of functional block TXJJNC10 is ' 1 ' in Correction and Control unit so that rotary pulse generator in the unit
Functional block TXJJNC14 is enabled, at this moment, if pinch roll (2) reference speed correction control switching unit output state before straightener machine
It is ' 1 ', then the counter function block TXJJNC20 of pinch roll (2) reference speed correction control unit starts reversely before straightener machine
Accumulated counts, pinch roll (2) reference speed correction value is gradually reduced before thus making straightener machine, so, is pinched before straightener machine
Roller (2) is gradually reduced by rolled piece (1) to the stress that pushes away that each smoothing roll of straightener applies, until pinch roll (2) before straightener machine
Pinch roll (2) drive motor electric current is electronic less than or equal to 95% before drive motor exits full load condition, i.e. straightener machine
Machine rated current；Or straightener reaches full load condition, i.e. straightener drive motor electric current and reaches the specified electricity of 100% motor
Stream.
10. according to the control method of the section straightener described in claim 5, it is characterised in that：
Pinch roll (4) pinch roll before full load condition, and straightener machine after straightener is in light condition, straightener machine
(2) before after heat No. two detectors (7) of inspection and straightener machine pinch roll (4) afterwards No. four detectors (9) of heat inspection pick up when, aligning
The output state of ' with door ' functional block TXJJNC11 is ' 1 ' in pinch roll (4) reference speed correction control unit after machine machine so that
Rotary pulse generator functional block TXJJNC15 is enabled in the unit, at this moment, if pinch roll (4) reference speed is repaiied after straightener machine
Positive control switching unit output state be ' 1 ', then after straightener machine pinch roll (4) reference speed correction control unit counter
Functional block TXJJNC21 starts reverse accumulated counts, and pinch roll (4) reference speed correction value gradually subtracts after thus making straightener machine
Small, so, pinch roll (4) is gradually reduced by rolled piece (1) to the tension that each smoothing roll of straightener applies after straightener machine, directly
Pinch roll (4) driven motor is electromechanical after pinch roll (4) drive motor exits full load condition, i.e. straightener machine after to straightener machine
Stream is less than or equal to 95% motor rated current；Or straightener reaches full load condition；
Thus obtain：Controlled by the tensile stress between section straightener and its front and rear pinch roll, that is, improve rectifying for section straightener
Straight ability.
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| CN201611177877.3A CN106694630A (en) | 2016-12-19 | 2016-12-19 | Profile steel straightening machine and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112547841A (en) * | 2019-09-25 | 2021-03-26 | 宝山钢铁股份有限公司 | Speed control method and device for working roll of pre-straightening machine |
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