CN105880293A - Skin-pass mill position and pressure closed-loop control system and method - Google Patents
Skin-pass mill position and pressure closed-loop control system and method Download PDFInfo
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- CN105880293A CN105880293A CN201510039568.9A CN201510039568A CN105880293A CN 105880293 A CN105880293 A CN 105880293A CN 201510039568 A CN201510039568 A CN 201510039568A CN 105880293 A CN105880293 A CN 105880293A
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Abstract
The invention provides a skin-pass mill position and pressure closed-loop control system and method. The system comprises a transmission-side hydraulic cylinder, a transmission-side pressure sensor, a transmission-side magnetic ruler, a transmission-side proportional valve, a transmission-side closed-loop controller, a transmission-side position and pressure setting and feedback subtracter, an operation-side pressure and position setting and feedback subtracter, an operation-side pressure sensor, an operation-side closed-loop controller, an operation-side proportional valve, an operation-side magnetic ruler and an operation-side hydraulic cylinder; and a PID closed-loop controller, a position feedback subtracter, a pressure feedback subtracter, a pressure setting subtracter, a position setting subtracter are additionally arranged in the system. In the process that the operation-side hydraulic cylinder and the transmission-side hydraulic cylinder extend and retract according to respective set positions or pressure, if the speed difference between the operation-side hydraulic cylinder and the transmission-side hydraulic is large, the PID closed-loop controller is in charge of controlling the position or pressure difference between two sides within a required range. According to the invention, defects such as quick operation and roller tying caused during a use process of a skin-pass mill can be avoided, so that the product quality is increased, the loss of rejected products and the frequency of shutdown of the skin-pass mill are reduced, and the operational efficiency of a machine set is improved.
Description
Technical field
The invention belongs to steel rolling automation field, particularly relate to a kind of cold-strip steel galvanizing polishing machine position deviation inclined with pressure
The closed-loop control system of difference adjustment and control method.
Background technology
Polishing machine is one of nucleus equipment of cold-strip steel hot dip galvanizing process, and major function is to match with withdrawal straightening machine thereafter, enters
Row determines elongation percentage or Constant dvaught pressure control.It is the whole polishing machine core that controls theory that hydraulic pressure automatically controls, this control method excellent
Bad, determine the quality of finishing product, open and strangle roller powder injection molding soon during especially polishing machine being put into and have great significance.
Certain cold rolling mill hot galvanizing line polishing machine hydraulic pressure automatically controls and there is design defect, opens soon and strangle roller during frequently resulting in input
Problem:
1, polishing machine position control is to use the independent position control in both sides, exists and press position action during polishing machine puts into
Inconsistent situation, causes fore side (OS) and transmission side (DS) both sides to press cylinder and occurs that bigger potential difference causes and opens soon, produce
Raw non-finishing defect.
2, polishing machine roll-force controls to be that the independent roll-force in both sides controls, and there is behaviour during position ring and roll-force ring cutting change
Make the situation that side is excessive with transmission side pressure at both sides deviation, cause the fluctuation of power difference acutely to produce Le print defect.
Due to the existence of the problems referred to above, frequently result in polishing machine mass defect and rise, become the key factor affecting zinc-plated lumber recovery.
Summary of the invention
Apparatus of the present invention provide one can automatically carry out potential difference and pressure reduction during polishing machine puts into and adjust, thus avoid opening soon and
Strangle roller defect, improve polishing machine position and pressure closed-loop control system and the method for product quality.
To this end, the solution that the present invention is taked is:
A kind of polishing machine position and pressure closed-loop control system, including transmission side hydraulic cylinder, transmission side pressure transducer, transmission side
Magnetic scale, transmission side proportioning valve, transmission side closed loop controller, transmission side position, pressure give and feed back subtractor, operation side pressure
Power, position give and feedback subtractor, fore side pressure transducer, fore side closed loop controller, fore side proportioning valve, operation
Side magnetic scale and fore side hydraulic cylinder, it is characterised in that set up PID closed loop controller, subtractor is fed back in position, pressure feedback subtracts
Musical instruments used in a Buddhist or Taoist mass, pressure give subtractor, position gives subtractor；PID closed loop controller connects transmission side proportioning valve and fore side respectively
Proportioning valve, subtractor is fed back in position and pressure feedback subtractor is connected with the feedback channel of PID closed loop controller, and pressure is given to be subtracted
Musical instruments used in a Buddhist or Taoist mass and position give being connected to routing of subtractor and PID closed loop controller；Position feedback subtractor and pressure feedback subtraction
Device connects transmission side position respectively, pressure is given and feedback subtractor is with fore side pressure, position is given and feeds back subtractor, pressure
Power gives subtractor and connects that transmission side pressure is given to be given with fore side pressure respectively, and position gives subtractor and connects transmission side respectively
Position is given to be given with fore side position.
A kind of polishing machine position and pressure closed loop control method, control including polishing machine position-force control and polishing machine pressure closed loop,
Its concrete control method is:
Polishing machine position-force control:
During polishing machine position control, fore side and transmission side are actually needed according to scene and give to a position respectively, operation
Side closed loop controller and transmission side closed loop controller position feedback with respective magnetic scale given according to respective position, carry out respective
Position deviation calculates, and according to respective position deviation amount, then the computing through respective closed loop controller, control respective ratio
Valve opening degree, and then indirectly control the position that respective hydraulic cylinder stretches out, it is ensured that fore side and transmission side are respectively maintained at the position of requirement
Put；
At fore side and transmission side hydraulic cylinder according in respective given position telescopic process, if it occur that fore side and transmission side hydraulic pressure
During speed difference ± 1mm/s that cylinder stretches, PID closed loop controller is responsible for controlling the position deviation between fore side and transmission side
In-2mm～+2mm, i.e. PID closed loop controller gives the difference between both sides position deviation feedback according to both sides position deviation,
Again through computing, the proportioning valve opening degree controlling the fast hydraulic cylinder of stretching speed reduces, and slows down its flexible speed, controls simultaneously
The proportioning valve opening degree of the hydraulic cylinder that stretching speed is slow increases, and accelerates its flexible speed, makes the position between fore side and transmission side
Put deviation to be controlled in given scope.
Polishing machine pressure closed loop controls:
In polishing machine pressure control procedure, fore side and transmission side are actually needed according to scene and give to a pressure respectively, operation
Side closed loop controller and transmission side closed loop controller be the given and pressure feedback of respective pressure transducer according to respective pressure, carries out
Respective pressure divergence calculates, according to respective pressure divergence amount, then the computing through respective closed loop controller, control respective
Proportioning valve opening degree, controls the pressure of respective hydraulic cylinder output indirectly, it is ensured that fore side and transmission side are respectively maintained at the pressure of requirement
Power；
At fore side and transmission side hydraulic cylinder according in respective setting pressure telescopic process, if it occur that fore side and transmission side hydraulic pressure
When the pressure x velocity of cylinder output differs ± 10 tons/s, PID closed loop controller is responsible for the pressure divergence between fore side and transmission side
Control in-20 tons～+20 tons, i.e. PID closed loop controller is according to pressure at both sides deviation is given and pressure at both sides deviation feeds back it
Between difference, then through computing, the proportioning valve opening degree controlling the fast hydraulic cylinder of pressure output speed reduces, and reduces its output pressure
Power, the proportioning valve opening degree simultaneously controlling the slow hydraulic cylinder of pressure output speed strengthens, and improves its output pressure, make fore side with
Pressure divergence between transmission side is controlled in given scope.
The invention have the benefit that
The present invention can automatically carry out potential difference during polishing machine puts into and pressure reduction adjusts, thus avoids opening soon and strangling the defects such as roller,
Improve product quality, loss of reducing the number of rejects and seconds, and reduce polishing machine machine stop times, improve unit operation rate.
Accompanying drawing explanation
Fig. 1 is polishing machine position and pressure closed-loop control system structured flowchart.
In figure: fore side pressure, position be given and feedback subtractor 1, fore side closed loop controller 2, fore side proportioning valve 3,
Fore side magnetic scale 4, fore side hydraulic cylinder 5, fore side pressure transducer 6, PID closed loop controller 7, position feedback subtractor 8,
Transmission side pressure transducer 9, transmission side hydraulic cylinder 10, transmission side magnetic scale 11, transmission side proportioning valve 12, transmission side closed loop control
Device 13, transmission side position, pressure is given and feedback subtractor 14, pressure feedback subtractor 15, pressure give subtractor 16,
Position gives subtractor 17.
Detailed description of the invention
As seen from Figure 1, polishing machine position of the present invention and pressure closed-loop control system, be to give in original fore side pressure, position
With feedback subtractor 1, fore side closed loop controller 2, fore side proportioning valve 3, fore side magnetic scale 4, fore side hydraulic cylinder 5,
Fore side pressure transducer 6, transmission side pressure transducer 9, transmission side hydraulic cylinder 10, transmission side magnetic scale 11, transmission side ratio
Valve 12, transmission side closed loop controller 13, transmission side position, pressure give and on the basis of feedback subtractor 14, are additionally arranged PID
Closed loop controller 7, position feed back subtractor 8, pressure feedback subtractor 15, pressure gives subtractor 16, position gives subtraction
Device 17.
PID closed loop controller 7 connects transmission side proportioning valve 12 and fore side proportioning valve 3, position feedback subtractor 8 and pressure respectively
Force feedback subtractor 15 is connected with the feedback channel of PID closed loop controller 7, and pressure gives subtractor 16 and position gives subtraction
Device 17 is connected to routing with PID closed loop controller 7.Position feedback subtractor 8 and pressure feedback subtractor 15 are also distinguished
Connect transmission side position, pressure is given and feedback subtractor 14 gives with fore side pressure, position and feedback subtractor 1；Pressure
It is given given with fore side pressure that given subtractor 16 connects transmission side pressure respectively, and position gives subtractor 17 and connects biography respectively
Dynamic side position is given to be given with fore side position.
Polishing machine position of the present invention and pressure closed loop control method, including polishing machine position-force control and polishing machine pressure closed loop control
System.
Polishing machine position-force control:
During polishing machine position control, fore side and transmission side are actually needed according to scene and give to a position respectively, such as,
Fore side position gives 150mm, transmission side position give 149.5mm, such fore side and transmission side position given between deviation
For 150-149.5=0.5mm.Fore side closed loop controller 2 and transmission side closed loop controller 13 given according to respective position and
Fore side magnetic scale 4, the position feedback of transmission side magnetic scale 11, carry out respective position deviation calculating, and inclined according to respective position
Residual quantity, then through computing, control fore side proportioning valve 3 and the opening degree of transmission side proportioning valve 12 respectively, and then indirectly control behaviour
Make side hydraulic cylinder 5, position that transmission side hydraulic cylinder 10 stretches out, it is ensured that fore side and transmission side are respectively maintained on the position of requirement.
At fore side hydraulic cylinder 5, transmission side hydraulic cylinder 10 according in respective given position telescopic process, if it occur that fore side liquid
When cylinder pressure 5 differs bigger with the flexible speed of transmission side hydraulic cylinder 10, PID closed loop controller 7 is responsible for fore side and transmission
Position deviation between side controls in 0.5mm, i.e. PID closed loop controller 7 is given and two side positions according to both sides position deviation
Difference between deviation feedback, then through computing, the proportioning valve opening degree controlling the fast hydraulic cylinder of stretching speed reduces, and slows down it
Flexible speed, the proportioning valve opening degree simultaneously controlling the slow hydraulic cylinder of stretching speed increases, and accelerates its flexible speed, makes behaviour
Make the position deviation between side and transmission side to be controlled in given scope.
Polishing machine pressure closed loop controls:
In polishing machine pressure control procedure, fore side and transmission side are actually needed according to scene and give to a pressure respectively, such as,
Fore side pressure gives 150 tons, and transmission side pressure gives 140 tons, the deviation between such fore side and transmission side pressure are given
For 150-140=10 ton.Fore side closed loop controller 2 and transmission side closed loop controller 13 are given and respective according to respective pressure
The pressure feedback of pressure transducer, carries out respective pressure divergence calculating, according to respective pressure divergence amount, then through each self-closing
The computing of ring controller, controls fore side proportioning valve 3 and the opening degree of transmission side proportioning valve 12 respectively, indirectly controls respective hydraulic pressure
The pressure of cylinder output, it is ensured that fore side and transmission side are respectively maintained at required pressure；
At fore side and transmission side hydraulic cylinder according in respective setting pressure telescopic process, if it occur that fore side hydraulic cylinder 5 with pass
When the differing pressure of dynamic side hydraulic cylinder 10 output is bigger, PID closed loop controller is responsible for inclined for the pressure between fore side and transmission side
Difference controls at 10 tons, and more than or less than 10 ton hours, PID closed loop controller 7 is given and two side positions according to both sides position deviation
Difference between deviation feedback, then through computing, the proportioning valve opening degree controlling the fast hydraulic cylinder of pressure output speed reduces, fall
Its output pressure low, the proportioning valve opening degree simultaneously controlling the slow hydraulic cylinder of pressure output speed strengthens, and improves its output pressure,
The pressure divergence between fore side and transmission side is made to be controlled in given scope.
Claims (2)
1. polishing machine position and a pressure closed-loop control system, including transmission side hydraulic cylinder, transmission side pressure
Sensor, transmission side magnetic scale, transmission side proportioning valve, transmission side closed loop controller, transmission side position, pressure
Given and feedback subtractor, fore side pressure, position be given and feedback subtractor, fore side pressure transducer,
Fore side closed loop controller, fore side proportioning valve, fore side magnetic scale and fore side hydraulic cylinder, it is characterised in that
Set up PID closed loop controller, position feedback subtractor, pressure feedback subtractor, pressure give subtractor,
Position gives subtractor；PID closed loop controller connects transmission side proportioning valve and fore side proportioning valve, position respectively
Feedback subtractor and pressure feedback subtractor are connected with the feedback channel of PID closed loop controller, and pressure is given to be subtracted
Musical instruments used in a Buddhist or Taoist mass and position give being connected to routing of subtractor and PID closed loop controller；Position feedback subtractor and
Pressure feedback subtractor connects that transmission side position, pressure is given respectively and feedback subtractor and fore side pressure,
Position is given and feedback subtractor, and pressure gives subtractor, and to connect transmission side pressure respectively given with operation side pressure
Power gives, and position gives subtractor and connects that transmission side position is given to be given with fore side position respectively.
2. the method applying polishing machine position described in claim 1 and pressure closed-loop control system, it is special
Levying and be, control including polishing machine position-force control and polishing machine pressure closed loop, its concrete control method is:
Polishing machine position-force control:
During polishing machine position control, fore side and transmission side are actually needed respectively to a position according to scene
Putting given, fore side closed loop controller and transmission side closed loop controller be given and respective magnetic according to respective position
The position feedback of chi, carries out respective position deviation calculating, and according to respective position deviation amount, then pass through
Each computing of closed loop controller, controls respective proportioning valve opening degree, and then indirectly controls respective hydraulic cylinder
The position stretched out, it is ensured that fore side and transmission side are respectively maintained on the position of requirement；
At fore side and transmission side hydraulic cylinder according in respective given position telescopic process, if it occur that fore side
Differ with the speed of transmission side hydraulic cylinder extension ± 1mm/s time, PID closed loop controller is responsible for fore side and biography
Position deviation between dynamic side controls in-2mm～+2mm, i.e. PID closed loop controller is inclined according to two side positions
Difference gives the difference between both sides position deviation feedback, then through computing, controls the hydraulic pressure that stretching speed is fast
The proportioning valve opening degree of cylinder reduces, and slows down its flexible speed, controls the slow hydraulic cylinder of stretching speed simultaneously
Proportioning valve opening degree increases, and accelerates its flexible speed, makes the position deviation quilt between fore side and transmission side
Control in given scope；
Polishing machine pressure closed loop controls:
In polishing machine pressure control procedure, fore side and transmission side are actually needed respectively to a pressure according to scene
Power gives, and fore side closed loop controller and transmission side closed loop controller are given according to respective pressure and each press
The pressure feedback of force transducer, carries out respective pressure divergence calculating, according to respective pressure divergence amount, then
Through the computing of respective closed loop controller, control respective proportioning valve opening degree, indirectly control respective hydraulic cylinder
The pressure of output, it is ensured that fore side and transmission side are respectively maintained at required pressure；
At fore side and transmission side hydraulic cylinder according in respective setting pressure telescopic process, if it occur that fore side
With transmission side hydraulic cylinder output pressure x velocity differ ± 10 tons/s time, PID closed loop controller is responsible for operating
Pressure divergence between side and transmission side controls in-20 tons～+20 tons, i.e. PID closed loop controller according to
Pressure at both sides deviation gives the difference between pressure at both sides deviation feedback, then through computing, controls pressure defeated
The proportioning valve opening degree going out fireballing hydraulic cylinder reduces, and reduces its output pressure, controls pressure output simultaneously
The proportioning valve opening degree of slow-footed hydraulic cylinder strengthens, and improves its output pressure, make fore side and transmission side it
Between pressure divergence be controlled in given scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510039568.9A CN105880293A (en) | 2015-01-26 | 2015-01-26 | Skin-pass mill position and pressure closed-loop control system and method |
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| CN201510039568.9A CN105880293A (en) | 2015-01-26 | 2015-01-26 | Skin-pass mill position and pressure closed-loop control system and method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0618021A1 (en) * | 1993-03-29 | 1994-10-05 | Siemens Aktiengesellschaft | Method and device for hydraulic roll-gap control |
| CN101362153A (en) * | 2008-01-22 | 2009-02-11 | 江苏科技大学 | Rolling mill hydraulic AGC system and control method thereof |
| CN201791925U (en) * | 2010-09-17 | 2011-04-13 | 湖南镭目科技有限公司 | Device for adjusting cleaning between rolls |
| CN103148063A (en) * | 2013-03-22 | 2013-06-12 | 太原科技大学 | Position and pressure master-slave control method of hydraulic servo system of valve-controlled cylinder |
-
2015
- 2015-01-26 CN CN201510039568.9A patent/CN105880293A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0618021A1 (en) * | 1993-03-29 | 1994-10-05 | Siemens Aktiengesellschaft | Method and device for hydraulic roll-gap control |
| CN101362153A (en) * | 2008-01-22 | 2009-02-11 | 江苏科技大学 | Rolling mill hydraulic AGC system and control method thereof |
| CN201791925U (en) * | 2010-09-17 | 2011-04-13 | 湖南镭目科技有限公司 | Device for adjusting cleaning between rolls |
| CN103148063A (en) * | 2013-03-22 | 2013-06-12 | 太原科技大学 | Position and pressure master-slave control method of hydraulic servo system of valve-controlled cylinder |
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Application publication date: 20160824 |