CN102189115A - Method for switching positive roller and negative roller of working roll - Google Patents

Abstract

The invention discloses a method for switching a positive roller and a negative roller of working rolls. A plurality of roller cylinders are arranged between roller bearings at the left side and the right side of an upper working roll and a lower working roll, a bearing block is movably connected with the roller cylinders, and a gap is kept between the heads of the roller cylinders and T-shaped slots in the roller bearings; the roller cylinders at the left side and the right side of the working rolls are classified into two groups, each group of working rolls are respectively controlled by an independent roller regulator, the two groups of roller cylinders and respective roller regulators form two regulating loops; and set values are selected for the two roller regulators to guarantee that at least one group of roller cylinders are in 'opening' or 'tensioning' state and the total roller force is equal to a process set value as required in the whole working range of the roller force. By adopting the method disclosed by the invention, the roller cylinders can be ensured to be tightly contacted with the bearing block, and uncertain 'free' state between the upper and lower working rolls can be eliminated. Meanwhile, gapless smooth switching between the positive roller and the negative roller is realized.

Description

The positive and negative roller changing method of working roll

Technical field

The present invention relates to a kind of metallurgical technology, be specifically related to a kind of positive and negative roller changing method of working roll.

Background technology

In all kinds of milling trains of metallurgical works, for the plate shape control with steel or steel plate, means commonly used are the positive and negative roller control of working roll, and wherein, the positive and negative curved handoff functionality of working roll is absolutely necessary.

Existing positive and negative roller switching device shifter comprises roller oil cylinder in groups, and the roller oil cylinder is arranged between the bearing block of the left and right sides of upper working rolls and lower working rolls.Normally in the left and right sides of working roll four roller oil cylinders are set respectively, these four roller oil cylinders lay respectively on 4 angles of bearing block.

When the cylinder head of four roller oil cylinders stretched out, the power that the bearing block of upper working rolls and lower working rolls is subjected to strutting in opposite directions made working roll just curved; When four roller oil cylinder indentations, the power that the bearing block of upper working rolls and lower working rolls is subjected to straining in opposite directions makes working roll negative curved.

In process of production, in order to reach good plate surface quality, working roll must be changed behind rolling certain hour.When changing working roll, working roll is pulled out frame together with bearing block and is replaced, and the roller oil cylinder is then stayed in the frame.

The replacing of working roll for convenience is designed between the bearing block of working roll and the roller oil cylinder flexibly connect.Structure commonly used at present is that the cylinder head of roller oil cylinder is "T"-shaped, and bearing block is provided with "T"-shaped groove, when new working roll inserted frame, the "T"-shaped cylinder head of roller oil cylinder can be inserted in the "T"-shaped groove of bearing block, thereby has realized the flexible connection between roller oil cylinder and bearing block.In order to carry out the roll change of working roll smoothly, also require during Machine Design to leave certain clearance between the "T"-shaped groove of the "T"-shaped cylinder head of roller oil cylinder and bearing block, the about 10mm of total backlash after the general both sides addition, as shown in Figure 1.

Owing to have the space between the cylinder head of roller oil cylinder and the bearing block, this gap can cause working roll to switch to negatively when curved from just curved, and promptly the roller oil cylinder is when " strutting mode " switches to " tension mode ", and oil cylinder has the idle stroke of 10mm altogether approximately.During oil cylinder is in idle stroke, because this moment, the cylinder head of roller oil cylinder broke away from bearing block, cause between the upper working rolls and lower working rolls nondeterministic statement that is in " dissociating ", the in-oil cylinder oil pressure of roller this moment can not be represented the size of bending roller force, cause bending roller force correctly to measure thus, the roller adjuster is normally closed-loop control also.In addition, because the existence in gap, working roll bending roller force after switching also has impact phenomenon, causes the cylinder head of roller oil cylinder to produce mechanical damage.These strip running deviation and broken belt accident occur when often all causing steel rolling.Equally, when working roll switches to when just curved from negative curved, also identical problem can appear.

Summary of the invention

Technical problem to be solved by this invention provides a kind of positive and negative roller changing method of working roll, and it can eliminate working roll in positive and negative roller handoff procedure, is in the nondeterministic statement of " dissociating " between the upper working rolls and lower working rolls.

For solving the problems of the technologies described above, the technical solution of the positive and negative roller changing method of working roll of the present invention is:

Between the roller bearing of the left and right sides of upper working rolls and lower working rolls, a plurality of roller oil cylinders are set, for flexibly connecting, are provided with the gap between the interior T-slot of the cylinder head of roller oil cylinder and roller bearing between bearing block and the roller oil cylinder; The roller oil cylinder of the working roll left and right sides is divided into two groups, and every group of roller oil cylinder controlled by roller adjuster independently respectively, and two groups of roller oil cylinders and roller adjuster separately form two regulating loops;

Select the setting value of two roller adjusters, realize adjusting, to guarantee in whole bending roller force working range having at least one group of roller oil cylinder to be in " strutting " or " tension " state to the bending roller force of two regulating loops.

Select the method for the setting value of two roller adjusters to be:

Whole roller working range is divided into 3 kinds of working methods, and in first kind of working method, first regulating loop is for negative curved, and second regulating loop is for negative curved; In second kind of working method, first regulating loop is for just curved, and second regulating loop is for negative curved; In the third working method, first regulating loop is for just curved, and second regulating loop is for just curved;

The roller that technology controlling and process is required sets value F _REFWith working method switching point-F ₁,-F ₂, F ₃And F ₄Size compare, determine the control mode that the roller controller need enter:

When the roller regulating loop drops into for the first time, control system is carried out initialization, preset the roller regulating loop and be in working method 2 states;

When the roller regulating loop is in working method 2 and works as F _REF≤-F ₁The time, the roller regulating loop switches to working method 1 from mode 2;

Described roller regulating loop from the changing method that mode 2 switches to working method 1 is:

The first step: the setting value F of second regulating loop _{CV2_REF}From " F _REF-F _BASE" with slope k _RAMPSwitch to " F _REF", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}From " F _BASE" with same slope k _RAMPSwitch to " 0 ", adjuster CV ₁Carry out normal closed loop work;

Second step: work as CV ₁Setting value F _{CV1_REF}=0 o'clock, the setting value F of second regulating loop _{CV2_REF}Still be " F _REF", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}Still be " 0 ", but adjuster CV ₁Carry out open loop control, fixedly output valve " V is got in adjuster output _Switch", its direction makes oil cylinder head " indentation ", at this moment adjuster CV ₁Eliminate the action in " space ", switch to negative bending from just bending;

The 3rd step: when the actual bending roller force of first regulating loop reaches F _{CV1_FB}=-F _BASEThe time, the setting value F of second regulating loop _{CV2_REF}From " F _REF" with slope k _RAMPSwitch to " F _REF/ 2 ", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}From " 0 " with same slope k _RAMPSwitch to " F _REF-F _{CV2_REF}", adjuster CV ₁Carry out normal closed loop work;

When the roller regulating loop is in working method 1 and works as F _REF〉=-F ₂The time, the roller regulating loop switches to working method 2 from mode 1;

Described roller regulating loop from the changing method that mode 1 switches to working method 2 is:

The first step: the setting value F of second regulating loop _{CV2_REF}From " F _REF/ 2 " with slope k _RAMPSwitch to " F _REF", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}From " F _{EF-FCV2_REF}" with same slope k _RAMPSwitch to " 0 ", adjuster CV ₁Carry out normal closed loop work;

Second step: as the setting value F of first regulating loop _{CV1_REF}=0 o'clock, the setting value F of second regulating loop _{CV2_REF}From " F _REF" with slope k _RAMPSwitch to " F _REF-F _BASE", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}From " 0 " with same slope k _RAMPSwitch to " F _BASE", but adjuster CV ₁Carry out open loop control, fixed value " V is got in adjuster output _Switch", direction will make the oil cylinder head " stretch out ", at this moment adjuster CV ₁Eliminate the action in " space ", from negative curved switch to just curved;

The 3rd step: when the actual bending roller force of first regulating loop reaches F _{CV1_FB}=F _BASEThe time, the setting value F of second regulating loop _{CV2_REF}Still be " F _REF-F _BASE", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}Still be " F _BASE", adjuster CV ₁Carry out normal closed loop work.

When the roller regulating loop is in working method 2 and works as F _REF〉=F ₃The time, the roller regulating loop switches to working method 3 from mode 2;

Described roller regulating loop from the changing method that mode 2 switches to working method 3 is:

The first step: the setting value F of first regulating loop _{CV1_REF}From " F _REF+ F _BASE" with slope k _RAMPSwitch to " F _REF", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}From " F _BASE" with same slope k _RAMPSwitch to " 0 ", adjuster CV ₂Carry out normal closed loop work;

Second step: as the setting value F of second regulating loop _{CV2_REF}=0 o'clock, the setting value F of first regulating loop _{CV1_REF}Still be " F _REF", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}Still be " 0 ", but adjuster CV ₂Carry out open loop control, fixed value " V is got in adjuster output _Switch", direction will make the oil cylinder head " stretch out ", at this moment adjuster CV ₂Eliminate the action in " space ", from negative curved switch to just curved;

The 3rd step: when the actual bending roller force of second regulating loop reaches F _{CV2_FB}=F _BASEThe time, the setting value F of first regulating loop _{CV1_REF}From " F _REF" with slope k _RAMPSwitch to " F _REF/ 2 ", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}From " 0 " with same slope k _RAMPSwitch to " F _REF-F _{CV1_BEF}", adjuster CV ₂Carry out normal closed loop work.

When the roller regulating loop is in working method 3 and works as F _REF≤ F ₄The time, the roller regulating loop switches to working method 2 from mode 3;

Described roller regulating loop from the changing method that mode 3 switches to working method 2 is:

The first step: the setting value F of first regulating loop _{CV1_REF}From " F _REF/ 2 " with slope k _RAMPSwitch to " F _REF", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}From " F _REF-F _{CV1_REF}" with same slope k _RAMPSwitch to " 0 ", adjuster CV ₂Carry out normal closed loop work;

Second step: as the setting value F of second regulating loop _{CV2_REF}=0 o'clock, the setting value F of first regulating loop _{CV1_REF}From " F _REF" with slope k _RAMPSwitch to " F _REF+ F _BASE", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}From " 0 " with same slope k _RAMPSwitch to " F _BASE", but adjuster CV ₂Carry out open loop control, fixed value " V is got in adjuster output _Switch", its direction will make oil cylinder head " indentation ", at this moment adjuster CV ₂Eliminate the action in " space ", switch to negative bending from just bending;

The 3rd step: when the actual bending roller force of second regulating loop reaches F _{CV2_FB}=-F _BASEThe time, the setting value F of first regulating loop _{CV1_REF}Still be " F _REF+ F _BASE", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}Still be " F _BASE", adjuster CV ₂Carry out normal closed loop work.

In three kinds of working methods, the bending roller force of two roller regulating loops setting value choosing method is as follows:

When the roller regulating loop was in working method 1, the setting value of second regulating loop was got F _{CV2_REF}=F _REF/ 2; The setting value of first regulating loop is got F _{CV1_REF}=F _REF-F _{CV2_REF}

When the roller regulating loop is in working method 2, work as F _REF≤ 0 o'clock, the setting value of first regulating loop was got F _{CV1_REF}=F _BASE, the setting value of second regulating loop is got F _{CV2_REF}=F _REF-F _BASEWork as F _REF＞0 o'clock, the setting value of second regulating loop was got F _{CV2_REF}=-F _BASE, the setting value of first regulating loop is got F _{CV1_REF}=F _REF+ F _BASE

When the roller regulating loop was in working method 3, the setting value of first regulating loop was got F _{CV1_RF}=F _REF/ 2; The setting value of second regulating loop is got F _{CV2_REF}=F _REF-F _{CV1_REF}

The bending roller force setting value sum of described two roller regulating loops equals the bending roller force setting value that total technology controlling and process requires.

The technique effect that the present invention can reach is:

The present invention has adopted " F _BASE" the minimum setting value method of roller; can be in positive and negative curved handoff procedure; guarantee to have at least one group of roller cylinder to be in " strutting " or " tension " state all the time, thereby guarantee that the roller oil cylinder can closely contact with bearing block, has eliminated between the upper working rolls and lower working rolls nondeterministic statement that is in " dissociating ".

The present invention divided for three steps carried out in positive and negative roller between transfer period, thereby had realized that the no gap between the positive and negative roller takes over seamlessly.

The present invention is in entire work process, and the bending roller force of two control loops setting value sum is always F _{CV1_REF}+ F _{CV2_REF}=F _REF, the roller that is technological requirement is set power F _REF, and two roller adjusters have carried out closed-loop control, thereby have realized that actual bending roller force can follow the roller that technology controlling and process requires all the time and set power.

Description of drawings

The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:

The schematic diagram of relative position between roller oil cylinder and bearing block when Fig. 1 is roll change;

Fig. 2 is the structural representation of the positive and negative roller switching device shifter of working roll used in the present invention;

Fig. 3 is that roller of the present invention is regulated the control block diagram;

Fig. 4 is the switching schematic diagram of the positive and negative roller changing method of working roll of the present invention.

Description of reference numerals among the figure:

10 is working roll, and 11 is bearing block,

20 is the roller oil cylinder, CV ₁, CV ₂Be roller adjuster servo valve,

P10, P11, P20, P21 are Pressure gauge.

The specific embodiment

The positive and negative roller changing method of working roll of the present invention, between the roller bearing of the left and right sides of upper working rolls and lower working rolls, a plurality of roller oil cylinders are set, roll change for convenience for flexibly connecting, is provided with the gap between the T-slot in the cylinder head of roller oil cylinder and the roller bearing between bearing block and the roller oil cylinder; With the working roll center line is symmetry, and the roller oil cylinder of the working roll left and right sides is divided into two groups, and every group of roller oil cylinder is provided with independently roller adjuster, and every group of roller oil cylinder is by independently roller adjuster and servo valve are controlled separately.

As shown in Figure 2, working roll 10 left and right sides are provided with four roller oil cylinders respectively, two roller oil cylinders outside two roller oil cylinders of outside, the left side of working roll 10 and the right side and servo valve CV ₁Form first regulating loop, first regulating loop is provided with Pressure gauge P10 and P11; Two roller oil cylinders inside two roller oil cylinders of the inside, the left side of working roll 10 and the right side and servo valve CV ₂Form second regulating loop, second regulating loop is provided with Pressure gauge P20 and P21.

Select two roller adjuster CV ₁, CV ₂Setting value, realization is to the adjusting of the bending roller force value of two regulating loops, to guarantee in whole bending roller force working range, all the time have at least one group of roller oil cylinder to be in " strutting " or " tension " state, thereby eliminate the nondeterministic statement that is in " dissociating " between upper working rolls and lower working rolls and the bearing block, realized that the no gap between the positive and negative roller takes over seamlessly.

Within whole working range, make the bending roller force setting value sum of two roller regulating loops equal the bending roller force setting value that total technology controlling and process requires, i.e. F all the time simultaneously _{CV1_REF}+ F _{CV2_REF}=F _REF, make actual bending roller force follow the setting power that roller requires all the time.

Select two roller adjuster CV ₁, CV ₂The method of setting value as follows:

Two roller adjuster CV ₁, CV ₂Adjustable range (being whole roller working range) be minimum bending roller force-F _M1NValue is to maximum bending roller force F _MAXBetween the value, whole roller working range is divided into as shown in Figure 43 kinds of working methods, promptly in first kind of working method, first regulating loop is for negative curved, and second regulating loop is for negative curved; In second kind of working method, first regulating loop is for just curved, and second regulating loop is for negative curved; In the third working method, first regulating loop is for just curved, and second regulating loop is for just curved;

The roller that technology controlling and process is required sets value F _REFWith working method switching point-F ₁,-F ₂, F ₃And F ₄Size compare, determine the control mode that the roller controller need enter, concrete grammar is as follows:

When the roller regulating loop drops into for the first time, control system is carried out initialization, preset the roller regulating loop and be in working method 2 states;

When the roller regulating loop is in working method 2 and works as F _REF≤-F ₁The time, the roller regulating loop switches to working method 1 from mode 2; Arrive the B point from the A point in the corresponding diagram 4, this moment, adjuster divided for three steps switched:

The first step: the setting value F of second regulating loop _{CV2_REF}From " F _REF-F _BASE" with slope k _RAMPSwitch to " F _REF", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}From " F _BASE" with same slope k _RAMPSwitch to " 0 ", adjuster CV ₁Carry out normal closed loop work;

Second step: work as CV ₁Setting value F _{CV1_REF}=0 o'clock, the setting value F of second regulating loop _{CV2_REF}Still be " F _REF", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}Still be " 0 ", but adjuster CV ₁Carry out open loop control, fixedly output valve " V is got in adjuster output _Switch", its direction makes oil cylinder head " indentation ", at this moment adjuster CV ₁Eliminate the action in " space ", switch to negative bending from just bending;

The 3rd step: when the actual bending roller force of first regulating loop reaches F _{CV1_FB}=-F _BASEThe time, the setting value F of second regulating loop _{CV2_REF}From " F _REF" with slope k _RAMPSwitch to " F _REF/ 2 ", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}From " 0 " with same slope k _RAMPSwitch to " F _REF-F _{CV2_REF}", adjuster CV ₁Carry out normal closed loop work.

When the roller regulating loop is in working method 1 and works as F _REF〉=-F ₂The time, the roller regulating loop switches to working method 2 from mode 1; Arrive the E point from the D point in the corresponding diagram 4, this moment, adjuster divided for three steps switched:

The first step: the setting value F of second regulating loop _{CV2_REF}From " F _REF/ 2 " with slope k _RAMPSwitch to " F _REF", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}From " F _REF-F _{CV2_REF}" with same slope k _RAMPSwitch to " 0 ", adjuster CV ₁Carry out normal closed loop work;

Second step: as the setting value F of first regulating loop _{CV1_REF}=0 o'clock, the setting value F of second regulating loop _{CV2_REF}From " F _REF" with slope k _RAMPSwitch to " F _REF-F _BASE", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}From " 0 " with same slope k _RAMPSwitch to " F _BASE", but adjuster CV ₁Carry out open loop control, fixed value " V is got in adjuster output _Switch", direction will make the oil cylinder head " stretch out ", at this moment adjuster CV ₁Eliminate the action in " space ", from negative curved switch to just curved;

The 3rd step: when the actual bending roller force of first regulating loop reaches F _{CV1_FB}=F _BASEThe time, the setting value F of second regulating loop _{CV2_REF}Still be " F _REF-F _BASE", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}Still be " F _BASE", adjuster CV ₁Carry out normal closed loop work.

When the roller regulating loop is in working method 2 and works as F _REF〉=F ₃The time, the roller regulating loop switches to working method 3 from mode 2; Arrive the I point from the H point in the corresponding diagram 4, this moment, adjuster divided for three steps switched:

The first step: the setting value F of first regulating loop _{CV1_REF}From " F _REF+ F _BASE" with slope k _RAMPSwitch to " F _REF", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}From " F _BASE" with same slope k _RAMPSwitch to " 0 ", adjuster CV ₂Carry out normal closed loop work;

Second step: as the setting value F of second regulating loop _{CV2_REF}=0 o'clock, the setting value F of first regulating loop _{CV1_REF}Still be " F _REF", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}Still be " 0 ", but adjuster CV ₂Carry out open loop control, fixed value " V is got in adjuster output _Switch", direction will make the oil cylinder head " stretch out ", at this moment adjuster CV ₂Eliminate the action in " space ", from negative curved switch to just curved;

The 3rd step: when the actual bending roller force of second regulating loop reaches F _{CV2_FB}=F _BASEThe time, the setting value F of first regulating loop _{CV1_REF}From " F _REF" with slope k _RAMPSwitch to " F _REF/ 2 ", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}From " 0 " with same slope k _RAMPSwitch to " F _REF-F _{CV1_REF}", adjuster CV ₂Carry out normal closed loop work.

When the roller regulating loop is in working method 3 and works as F _REF≤ F ₄The time, the roller regulating loop switches to working method 2 from mode 3; Arrive the G point from the J point in the corresponding diagram 4, this moment, adjuster divided for three steps switched:

The first step: the setting value F of first regulating loop _{CV1_REF}From " F _REF/ 2 " with slope k _RAMPSwitch to " F _REF", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}From " F _REF-F _{CV1_REF}" with same slope k _RAMPSwitch to " 0 ", adjuster CV ₂Carry out normal closed loop work;

Second step: as the setting value F of second regulating loop _{CV2_REF}=0 o'clock, the setting value F of first regulating loop _{CV1_REF}From " F _REF" with slope k _RAMPSwitch to " F _REF+ F _BASE", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}From " 0 " with same slope k _RAMPSwitch to " F _BASE", but adjuster CV ₂Carry out open loop control, fixed value " V is got in adjuster output _Switch", its direction will make oil cylinder head " indentation ", at this moment adjuster CV ₂Eliminate the action in " space ", switch to negative bending from just bending;

The 3rd step: when the actual bending roller force of second regulating loop reaches F _{CV2_FB}=-F _BASEThe time, the setting value F of first regulating loop _{CV1_REF}Still be " F _REF+ F _BASE", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}Still be " F _BASE", adjuster CV ₂Carry out normal closed loop work.

Working method switching point-F ₁,-F ₂, F ₃And F ₄Selection as follows:

-F ₁＝-F _MIN×60％

-F ₂＝-F _MIN×20％

F ₃＝F _MAX×60％

F ₄＝F _MAX×20％

In different working methods, by the setting value of two roller regulating loops of choose reasonable, the no gap of realizing positive and negative bending roller force takes over seamlessly follows roller all the time with actual bending roller force and sets power; The bending roller force setting value choosing method of two roller regulating loops is as follows:

When the roller regulating loop is in working method 1, be in the C point between the D point corresponding to control among Fig. 4, the set-point F that require this moment _REFCan be at " F _MIN≤ F _REF＜-F ₂" between change the setting value F of second regulating loop arbitrarily _{CV2_REF}Remain " F _REF/ 2 ", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}Remain " F _REF-F _{CV2_REF}", adjuster CV ₁Carry out normal closed loop work.

When the roller regulating loop is in working method 2, be in the A point between the F point corresponding to control among Fig. 4, the set-point F that require this moment _REFCan be at " F ₁＜F _REF≤ 0 " changes the setting value F of second regulating loop between arbitrarily _{CV2_REF}Still be " F _REF-F _BASE", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}Still be " F _BASE", adjuster CV ₁Carry out normal closed loop work.

When the roller regulating loop is in working method 2, be in the F point between the H point corresponding to control among Fig. 4, the set-point F that require this moment _REFCan be at " 0＜F _REF＜F ₃" between change the setting value F of second regulating loop arbitrarily _{CV2_REF}Be " F _BASE", adjuster CV ₂Carry out normal closed loop work.The setting value F of first regulating loop _{CV1_REF}Be " F _REF+ F _BASE", adjuster CV ₁Carry out normal closed loop work.

When the roller regulating loop is in working method 3, be in the J point between the K point corresponding to control among Fig. 4, the set-point F that require this moment _REFCan be at " F ₄＜F _REF≤ F _MAX" between change the setting value F of first regulating loop arbitrarily _{CV1_REF}Be " F _REF/ 2 ", CV ₁Adjuster carries out normal closed loop work.The setting value F of second regulating loop _{CV2_REF}Be " F _REF-F _{CV1_REF}", CV ₂Adjuster carries out normal closed loop work.

Wherein, the value of each parameter is as follows:

F _REFThe bending roller force that requires for technology controlling and process sets value

-F _MINBe the minimal negative bending roller force value of determining by equipment

F _MAXBe the maximum positive bending roller force value of determining by equipment

F _{CV1_REF}It is the setting value of first regulating loop

F _{CV2_REF}It is the setting value of second regulating loop

F _BASEFor the cylinder head that guarantees oil cylinder can closely contact required power, F with bearing block _BASE=F _MAX* 5%

k _RAMPThe variation slope of setting value when switching for the regulating loop working method

k _{REF_MAX}The roller setting value maximum of determining for technology controlling and process changes slope

k _RAMP＝4×k _{REF_MAX}

V _MAXBe the maximum output valve of the definite servo valve of equipment

V _SwitchFor between positive and negative roller, switching fixedly output valve up to servo valve

V _Switch=V _MAX* 5%.

Claims (8)

1. the positive and negative roller changing method of a working roll is provided with a plurality of roller oil cylinders between the roller bearing of the left and right sides of upper working rolls and lower working rolls, for flexibly connecting, be provided with the gap between the interior T-slot of the cylinder head of roller oil cylinder and roller bearing between bearing block and the roller oil cylinder; It is characterized in that: the roller oil cylinder of the working roll left and right sides is divided into two groups, and every group of roller oil cylinder controlled by roller adjuster independently respectively, and two groups of roller oil cylinders and roller adjuster separately form two regulating loops; Select the setting value of two roller adjusters, realize adjusting, to guarantee in whole bending roller force working range having at least one group of roller oil cylinder to be in " strutting " or " tension " state to the bending roller force of two regulating loops.

2. the positive and negative roller changing method of working roll according to claim 1 is characterized in that: the bending roller force setting value sum of described two roller regulating loops equals the bending roller force setting value that total technology controlling and process requires.

3. the positive and negative roller changing method of working roll according to claim 1 and 2, it is characterized in that: the method for the setting value of two roller adjusters of described selection is:

Whole roller working range is divided into three kinds of working methods, and in first kind of working method, first regulating loop is for negative curved, and second regulating loop is for negative curved; In second kind of working method, first regulating loop is for just curved, and second regulating loop is for negative curved; In the third working method, first regulating loop is for just curved, and second regulating loop is for just curved;

The roller that technology controlling and process is required sets value F _REFWith working method switching point-F ₁,-F ₂, F ₃And F ₄Size compare, determine the control mode that the roller controller need enter:

When the roller regulating loop drops into for the first time, control system is carried out initialization, preset the roller regulating loop and be in working method 2 states;

When the roller regulating loop is in working method 2 and works as F _REF≤-F ₁The time, the roller regulating loop switches to working method 1 from mode 2;

When the roller regulating loop is in working method 1 and works as F _REF〉=-F ₂The time, the roller regulating loop switches to working method 2 from mode 1;

When the roller regulating loop is in working method 2 and works as F _REF〉=F ₃The time, the roller regulating loop switches to working method 3 from mode 2;

When the roller regulating loop is in working method 3 and works as F _REF≤ F ₄The time, the roller regulating loop switches to working method 2 from mode 3;

Working method switching point-F ₁,-F ₂, F ₃And F ₄Selection as follows:

-F ₁＝-F _MIN×60％

-F ₂＝-F _MIN×20％

F ₃＝F _MAX×60％

F ₄＝F _MAX×20％

F _REFThe bending roller force that requires for technology controlling and process sets value

-F _MINBe the minimal negative bending roller force value of determining by equipment

F _MAXBe the maximum positive bending roller force value of determining by equipment.

4. the positive and negative roller changing method of working roll according to claim 3 is characterized in that: in described three kinds of working methods, the bending roller force of two roller regulating loops setting value choosing method is as follows:

When the roller regulating loop was in working method 1, the setting value of second regulating loop was got F _{CV2_REF}=F _REF/ 2; The setting value of first regulating loop is got F _{CV1_REF}=F _REF-F _{CV2_REF}

When the roller regulating loop is in working method 2, work as F _REF≤ 0 o'clock, the setting value of first regulating loop was got F _{CV1_REF}=F _BASE, the setting value of second regulating loop is got F _{CV2_REF}=F _REF-F _BASEWork as F _REF＞0 o'clock, the setting value of second regulating loop was got F _{CV2_REF}=-F _BASE, the setting value of first regulating loop is got F _{CV1_REF}=F _REF+ F _BASE

When the roller regulating loop was in working method 3, the setting value of first regulating loop was got F _{CV1_REF}=F _REF/ 2; The setting value of second regulating loop is got F _{CV2_REF}=F _REF-F _{CV1_REF}

Wherein,

F _{CV1_REF}It is the setting value of first regulating loop

F _{CV2_REF}It is the setting value of second regulating loop

F _BASEFor the cylinder head that guarantees oil cylinder can closely contact required power, F with bearing block _BASE=F _MAX* 5%.

5. the positive and negative roller changing method of working roll according to claim 3, it is characterized in that: described roller regulating loop from the changing method that mode 2 switches to working method 1 is:

The first step: the setting value F of second regulating loop _{CV2_REF}From " F _REF-F _BASE" with slope k _RAMPSwitch to " F _REF", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}From " F _BASE" with same slope k _RAMPSwitch to " 0 ", adjuster CV ₁Carry out normal closed loop work;

Second step: work as CV ₁Setting value F _{CV1_REF}=0 o'clock, the setting value F of second regulating loop _{CV2_REF}Still be " F _REF", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}Still be " 0 ", but adjuster CV ₁Carry out open loop control, fixedly output valve " V is got in adjuster output _Switch", its direction makes oil cylinder head " indentation ", at this moment adjuster CV ₁Eliminate the action in " space ", switch to negative bending from just bending;

The 3rd step: when the actual bending roller force of first regulating loop reaches F _{CV1_FB}=-F _BASEThe time, the setting value F of second regulating loop _{CV2_REF}From " F _REF" with slope k _RAMPSwitch to " F _REF/ 2 ", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}From " 0 " with same slope k _RAMPSwitch to " F _REF-F _{CV2_REF}", adjuster CV ₁Carry out normal closed loop work;

Wherein:

k _RAMPThe variation slope of setting value when switching for the regulating loop working method

k _{REF_MAX}The roller setting value maximum of determining for technology controlling and process changes slope

k _RAMP＝4×k _{REF_MAX}

V _MAXBe the maximum output valve of the definite servo valve of equipment

V _SwitchFor between positive and negative roller, switching fixedly output valve up to servo valve

V _Switch=V _MAX* 5%.

6. the positive and negative roller changing method of working roll according to claim 3, it is characterized in that: described roller regulating loop from the changing method that mode 1 switches to working method 2 is:

The first step: the setting value F of second regulating loop _{CV2_REF}From " F _REF/ 2 " with slope k _RAMPSwitch to " F _REF", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}From " F _REF-F _{CV2_REF}" with same slope k _RAMPSwitch to " 0 ", adjuster CV ₁Carry out normal closed loop work;

Second step: as the setting value F of first regulating loop _{CV1_REF}=0 o'clock, the setting value F of second regulating loop _{CV2_REF}From " F _REF" with slope k _RAMPSwitch to " F _REF-F _BASE", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}From " 0 " with same slope k _RAMPSwitch to " F _BASE", but adjuster CV ₁Carry out open loop control, fixed value " V is got in adjuster output _Switch", direction will make the oil cylinder head " stretch out ", at this moment adjuster CV ₁Eliminate the action in " space ", from negative curved switch to just curved;

The 3rd step: when the actual bending roller force of first regulating loop reaches F _{CV1_FB}=F _BASEThe time, the setting value F of second regulating loop _{CV2_REF}Still be " F _REF-F _BASE", adjuster CV ₂Carry out normal closed loop work; The setting value F of first regulating loop _{CV1_REF}Still be " F _BASE", adjuster CV ₁Carry out normal closed loop work.

7. the positive and negative roller changing method of working roll according to claim 3, it is characterized in that: described roller regulating loop from the changing method that mode 2 switches to working method 3 is:

The first step: the setting value F of first regulating loop _{CV1_REF}From " F _REF+ F _BASE" with slope k _RAMPSwitch to " F _REF", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}From " F _BASE" with same slope k _RAMPSwitch to " 0 ", adjuster CV ₂Carry out normal closed loop work;

Second step: as the setting value F of second regulating loop _{CV2_REF}=0 o'clock, the setting value F of first regulating loop _{CV1_REF}Still be " F _REF", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}Still be " 0 ", but adjuster CV ₂Carry out open loop control, fixed value " V is got in adjuster output _Switch", direction will make the oil cylinder head " stretch out ", at this moment adjuster CV ₂Eliminate the action in " space ", from negative curved switch to just curved;

The 3rd step: when the actual bending roller force of second regulating loop reaches F _{CV2_FB}=F _BASEThe time, the setting value F of first regulating loop _{CV1_REF}From " F _REF" with slope k _RAMPSwitch to " F _REF/ 2 ", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}From " 0 " with same slope k _RAMPSwitch to " F _REF-F _{CV1_REF}", adjuster CV ₂Carry out normal closed loop work.

8. the positive and negative roller changing method of working roll according to claim 3, it is characterized in that: described roller regulating loop from the changing method that mode 3 switches to working method 2 is:

The first step: the setting value F of first regulating loop _{CV1_REF}From " F _REF/ 2 " with slope k _RAMPSwitch to " F _REF", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}From " F _REF-F _{CV1_REF}" with same slope k _RAMPSwitch to " 0 ", adjuster CV ₂Carry out normal closed loop work;

Second step: as the setting value F of second regulating loop _{CV2_REF}=0 o'clock, the setting value F of first regulating loop _{CV1_REF}From " F _REF" with slope k _RAMPSwitch to " F _REF+ F _BASE", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}From " 0 " with same slope k _RAMPSwitch to " F _BASE", but adjuster CV ₂Carry out open loop control, fixed value " V is got in adjuster output _Switch", its direction will make oil cylinder head " indentation ", at this moment adjuster CV ₂Eliminate the action in " space ", switch to negative bending from just bending;

The 3rd step: when the actual bending roller force of second regulating loop reaches F _{CV2_FB}=-F _BASEThe time, the setting value F of first regulating loop _{CV1_REF}Still be " F _REF+ F _BASE", adjuster CV ₁Carry out normal closed loop work; The setting value F of second regulating loop _{CV2_REF}Still be " F _BASE", adjuster CV ₂Carry out normal closed loop work.

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