CN109013709B - A kind of Wrapping Roll Jump control method of hot rolling reeling Automatic Optimal timing - Google Patents

Abstract

A kind of Wrapping Roll Jump control method of hot rolling reeling Automatic Optimal timing, consider that mill speed variation and servo valve aging respond the slack-off influence to head tracking, carry out the automatic timing amendment of AJC, it is specific as follows: when tracking length more than or equal to distance L-a between pinch roller and Wrapping Roll, Wrapping Roll is pushed by holding fix until being attached to steel plate, later with the tracking of angle sequential manner, start take-off when Δ-δ angle before i.e. second circle head reaches Wrapping Roll, it pushes after head reaches Wrapping Roll until being attached to steel plate, a few circle leapfrog timing are consistent with the second circle tracking below；Wherein: a=V × (H1/v+t), δ=[V × (Hi/v+t)/(π D)] × 360 °.Compared with prior art, final to improve production efficiency and product quality the beneficial effects of the present invention are: a kind of Wrapping Roll Jump control method of hot rolling reeling Automatic Optimal timing, solves control sequential and bring negative effect is not allowed, reduce production accident.

Description

A kind of Wrapping Roll Jump control method of hot rolling reeling Automatic Optimal timing

Technical field

The present invention relates to industrial automatic control more particularly to a kind of Wrapping Roll leapfrogs of hot rolling reeling Automatic Optimal timing Control method.

Background technique

In hot-strip production, batch that the automatic Autostep of AJC is most important, and the purpose is to reduce batching as far as possible When due to taking the lead to bump against and the impression that generates on strip with Wrapping Roll.

The basic principle of automatic Autostep is: seeing Fig. 1, automatically tracks and calculate 3 head position of strip and to electrical control Send signal.Each Wrapping Roll 6 is equipped with position and pressure controller, after 3 coiling process of strip starts, whenever strip 3 When portion goes to apart from any 6 proximity of Wrapping Roll, which is all lifted rapidly and strip 3 disengages；And work as band After 3 head of steel passes through Wrapping Roll 6, which is then returned rapidly by compress the strip 3 on reel 8, and pressing force control mode Operation.The process will continue to batch several circles after until whole Wrapping Rolls 6 open.Good Step-by-step control system should guarantee Under the premise of 3 head of strip is not bumped against with Wrapping Roll 6, as far as possible the time of diminution Wrapping Roll 6 and the disengaging of strip 3, make scroll not It is impacted.

It is all carried out both at home and abroad using fixed angle or fixed tracking length in hot rolling reeling Autostep timing at present Autostep does not account for 7 response characteristic of servo valve, and it uses property retrogradation response after several years is slack-off especially.Another is former Cause does not account for the influence that different size mill speed difference tracks AJC, and most thin most think gauge speed differs 3-4 times, that is, rolls Leapfrog shifts to an earlier date very much when fast (3m/s) is slow；Leapfrog is not takeoff when rolling fast (12m/s) fastly.AJC control sequential is not allowed that head is easily caused to beat Sliding, head set, head scroll are bad, head has been also easy to produce impression, the big even steel-fastening of mechanical oscillation.

Summary of the invention

The object of the present invention is to provide a kind of Wrapping Roll Jump control methods of hot rolling reeling Automatic Optimal timing, solve control Bring negative effect is not allowed in timing processed, reduces production accident, final to improve production efficiency and product quality.

To achieve the above object, the present invention is implemented with the following technical solutions:

A kind of Wrapping Roll Jump control method of hot rolling reeling Automatic Optimal timing considers mill speed variation and servo valve Aging responds the slack-off influence to head tracking, carries out the automatic timing amendment of AJC, specific as follows:

When tracking length more than or equal to distance L-a between pinch roller and Wrapping Roll, Wrapping Roll is by straightening under holding fix To steel plate is attached to, later with the tracking of angle sequential manner, i.e., start when Δ-δ angle before the second circle head reaches Wrapping Roll Jump, when head reach Wrapping Roll after push until being attached to steel plate, behind several circle leapfrog timing with second circle tracking unanimously；

Wherein: a=V × (H1/v+t)

δ=[V × (Hi/v+t)/(π D)] × 360 °

Distance between L--- pinch roller and Wrapping Roll

A--- is pushed for the first time shifts to an earlier date tracking range

V--- strip linear velocity

H1--- waits roll gap before pushing for the first time

Hi--- i-th is takeoff roll gap height

Δ --- original AJC acts degree of advance

δ --- mill speed variation and servo valve response lag are to the angle correction of head tracking

V--- Wrapping Roll response speed

D--- coil diameter

T--- servo valve response lag time, the t=0 if servo valve does not respond to lag.

Compared with prior art, the beneficial effects of the present invention are:

A kind of Wrapping Roll Jump control method of hot rolling reeling Automatic Optimal timing solves control sequential and is not allowed bring negative Face is rung, and reduces production accident, final to improve production efficiency and product quality.

After the present invention is implemented, AJC follow timing pulse is accurate, batches head skidding, head covers, head scroll is bad, head It has been also easy to produce that impression, mechanical oscillation are big, steel-fastening probability greatly reduces, rolling stability adjusted greatly increases.

Detailed description of the invention

Fig. 1 is that hydraulic efficiency servo-valve controls Wrapping Roll AJC control principle drawing in the present invention.

Fig. 2 is the influence for not accounting for mill speed variation and servo valve aging to leapfrog follow timing pulse, reel current wave Cardon.

Fig. 3 is to be controlled using method of the invention Wrapping Roll leapfrog, reel current wave cardon.

In figure: 1- pinch roller, 2- accelerometer, 3- strip, 4- impulse generator, 5- hydraulic cylinder, 6- Wrapping Roll, 7- servo Valve, 8- reel.

Specific embodiment

Embodiments of the present invention are further illustrated with reference to the accompanying drawing:

As shown in Figure 1, accelerometer 2 detects 3 linear velocity of strip, which passes to tracking by impulse generator 4 System, then command signal is sent from tracking system to electrical, hydraulic servo control system, servo valve 7 controls hydraulic cylinder 5 and lifts pressure Under.A kind of Wrapping Roll Jump control method of hot rolling reeling Automatic Optimal timing of the present invention considers mill speed variation and servo 7 aging of valve responds the slack-off influence to head tracking, carries out the automatic timing amendment of AJC, specific as follows:

When tracking length more than or equal to distance L-a between pinch roller 1 and Wrapping Roll 6, Wrapping Roll 6 is pushed by holding fix Until being attached to steel plate, later with the tracking of angle sequential manner, i.e., start when Δ-δ angle before the second circle head reaches Wrapping Roll 6 Take-off pushes after head reaches Wrapping Roll 6 until being attached to steel plate, that is to say, that reel turns over the angle Δ-δ after starting take-off Degree, Wrapping Roll push；A few circle leapfrog timing are consistent with the second circle tracking below；

Wherein: a=V × (H1/v+t)

δ=[V × (Hi/v+t)/(π D)] × 360 °

Distance between L--- pinch roller 1 and Wrapping Roll 6

A--- is pushed for the first time shifts to an earlier date tracking range

3 linear velocity of V--- strip

H1--- waits roll gap before pushing for the first time

Hi--- i-th is takeoff roll gap height

Δ --- original AJC acts degree of advance (- 62 ° of 1# Wrapping Roll Δ=58 °；- 172 ° of 2# Wrapping Roll Δ=168 °； - 287 ° of 3# Wrapping Roll Δ=283 °；)

δ --- mill speed variation and servo valve response lag are to the angle correction of head tracking

6 response speed of v--- Wrapping Roll

D--- coil diameter

The 7 response lag time of t--- servo valve

If servo valve 7 does not have aging, without considering that servo valve 7 responds the slack-off influence to head tracking, only consider to roll Influence of the velocity variations processed to head tracking carries out the automatic timing amendment of AJC, then t=0, specific formula is as follows:

A=V × (H1/v)

δ=[V × (Hi/v)/π D] × 360 °

Distance between L--- pinch roller 1 and Wrapping Roll 6

A--- is pushed for the first time shifts to an earlier date tracking range

3 linear velocity of V--- strip

H1--- waits roll gap before pushing for the first time

Hi--- i-th is takeoff roll gap height

Δ --- original AJC acts degree of advance (- 62 ° of 1# Wrapping Roll Δ=58 °；- 172 ° of 2# Wrapping Roll Δ=168 °； - 287 ° of 3# Wrapping Roll Δ=283 °；)

δ --- mill speed changes the angle correction to head tracking

6 response speed of v--- Wrapping Roll

D--- coil diameter.

See Fig. 2, responds the slack-off shadow to leapfrog follow timing pulse in 7 aging of variation and servo valve for not accounting for mill speed In the case where sound, this follow timing pulse control be easy to cause 8 current fluctuation of reel big, and head scroll is bad, and several circles in head have pressure Trace.

After seeing that Fig. 3, the present invention are implemented, AJC follow timing pulse is accurate, and 8 current fluctuation of reel is steady, and rolling stability is significantly Increase.

Claims (1)

1. a kind of Wrapping Roll Jump control method of hot rolling reeling Automatic Optimal timing, which is characterized in that consider that mill speed becomes Change and servo valve aging responds the slack-off influence to head tracking, carries out the automatic timing amendment of AJC, specific as follows:

When tracking length more than or equal to distance L-a between pinch roller and Wrapping Roll, Wrapping Roll is pushed by holding fix until patch To steel plate, later with the tracking of angle sequential manner, i.e., start take-off when Δ-δ angle before the second circle head reaches Wrapping Roll, when Head reach Wrapping Roll after push until being attached to steel plate, behind several circle leapfrog timing with second circle tracking unanimously；

Wherein: a=V × (H1/v+t)

δ=[V × (Hi/v+t)/(π D)] × 360 °

Distance between L--- pinch roller and Wrapping Roll

A--- is pushed for the first time shifts to an earlier date tracking range

V--- strip linear velocity

H1--- waits roll gap before pushing for the first time

Hi--- i-th is takeoff roll gap height

Δ --- original AJC acts degree of advance

δ --- mill speed variation and servo valve response lag are to the angle correction of head tracking

V--- Wrapping Roll response speed

D--- coil diameter

T--- servo valve response lag time, the t=0 if servo valve does not respond to lag.