CN201413468Y - Digital hydraulic rectifying system based on PLC - Google Patents
Digital hydraulic rectifying system based on PLC Download PDFInfo
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- CN201413468Y CN201413468Y CN2009201276140U CN200920127614U CN201413468Y CN 201413468 Y CN201413468 Y CN 201413468Y CN 2009201276140 U CN2009201276140 U CN 2009201276140U CN 200920127614 U CN200920127614 U CN 200920127614U CN 201413468 Y CN201413468 Y CN 201413468Y
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- valve
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- hydraulic cylinder
- programmable logic
- hydraulic
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Abstract
A digital hydraulic rectifying system based on PLC mainly comprises a photoelectric detector, a programmable controller and a hydraulic actuating mechanism, wherein the photoelectric detector can sample the position of strip steel in the operation process through a photosensitive resistance in time, and can convert the deviation position of the strip steel to voltage signals which are input to theprogrammable controller, the programmable controller can output pulse width modulation signals to control the hydraulic actuating mechanism after comparing and calculating the voltage signals, the hydraulic actuating mechanism consists of a digital valve and a hydraulic cylinder, a high-speed switch valve is arranged in the digital valve, the high-speed switch valve can output the pulse flow andcontrol the hydraulic cylinder to operate, and the hydraulic cylinder which is connected with a decoiler can drive the decoiler to trace the inlet position of the strip steel, and rectify the positiondeviation of the strip steel in the operation process. The rectifying system has the characteristics of fast response speed, high precision and strong interference resistance ability, and has stableperformance, reliable work and strong versatility.
Description
Technical field
The utility model relates to the Based Intelligent Control of high-velocity zone steel, is specifically related to a kind of digital hydraulic pressure deviation-rectifying system and control method thereof based on PLC.
Background technology
21 century is the epoch of kownledge economy, infotech will become most important resource and element of competition in the kownledge economy, it has also brought new opportunities and challenges for Chinese machinery manufacturing industry, it is that now present medium-sized and small enterprises are extricated oneself from a plight, try to achieve the best weapon of development, each enterprise has only and rationally utilizes various resources, adopts the advanced organizational form and the tool of production, just understands welcoming new development in the information age.In to the research with firm correction, uncoiler strip running deviation control system is also along with the intellectuality of hardware system, integrated and continuous development.
Now be with steel at present when the unit high speed is moved or batched, reasons such as deviation, vibration and tension force imbalance owing to guide roller in the unit, caused the strip edge edge or vertically the center line of markings and unit is not parallel, even departed from desired location and cause horizontal sideslip with steel.Be with the sideslip of steel to make that being with steel to be serpentine travels forward more, can not neatly batch, become the neat degree of roll edges very big, thereby directly have influence on the end product quality of belt steel product the installation and the uncoiling operating influence of band steel sheet in further rolling.At present, the one-tenth roll edges sideslip control that the band steel sheet uses in producing, great majority still adopt single-chip computer control system, because steel rolling production status inclement condition, vibration is big, temperature is high, environmental pollution is serious, make that the work of single-chip computer control system is very unstable, cause that response speed is slow, lower, the very high difficulty of maintenance requirement of correction precision.
The utility model content
At the prior art above shortcomings, the purpose of this utility model is to provide that a kind of response speed is fast, precision is high, antijamming capability is strong, and stable performance, reliable operation, the digital hydraulic pressure deviation-rectifying system based on PLC with strong versatility.
The technical solution of the utility model is: based on the digital hydraulic pressure deviation-rectifying system of PLC, mainly comprise photoelectric detector, Programmable Logic Controller and hydraulic actuating mechanism, photoelectric detector carries out real-time sampling by photoresistance to the position in the band steel operational process, and will be converted to voltage signal input Programmable Logic Controller with the deviation post of steel, Programmable Logic Controller is output pulse width modulation signal control hydraulic actuating mechanism after comparing, calculating; Hydraulic actuating mechanism comprises digital valve and hydraulic cylinder, in digital valve, be provided with high-speed switch valve, the action of high-speed switch valve output pulse flow control hydraulic cylinder, the take-off lever of hydraulic cylinder links to each other with the slide unit of uncoiler, slide unit can slide on the base of uncoiler, motor drives the rotation of correction roller by gearing, realize strip coiling, the take-off lever of hydraulic cylinder, motor and correction roller all are fixed on the slide unit of uncoiler, the take-off lever of hydraulic cylinder laterally moves about driving uncoiler slide unit side-to-side movement and then the correction roller also being done, realization is corrected being with the operating offset of steel, batches neat purpose to reach strip edge.
Further technical characterictic, the digital valve of pulse-width signal input hydraulic pressure topworks after amplifier amplifies of described Programmable Logic Controller output, digital valve is made of high-speed switch valve and solenoid directional control valve, and integrated two high-speed switch valves are controlled the left and right action of hydraulic cylinder respectively in digital valve, and solenoid directional control valve is according to the switch motion of the pulse-width signal control high-speed switch valve of input.
Based on the control method of the digital hydraulic pressure deviation-rectifying system of PLC, operate according to following steps:
1) in Programmable Logic Controller, presets an echo signal, the marginal position when described echo signal is normally moved for the band steel;
The position signalling input Programmable Logic Controller of the band steel operation of 2) photoelectric detector being gathered, Programmable Logic Controller judge sampled signal, if wrong then obtain sampled signal again, if would be judged as correctly then signal value stored;
3) Programmable Logic Controller compares sampled signal and echo signal, and calculates mean difference according to sampling number;
4) the Programmable Logic Controller dutycycle of regulating the output pulse width modulation signal, thereby the pulse voltage signal of control output according to the mean difference that calculates;
5) Programmable Logic Controller voltage pulse output signal drives hydraulic actuating mechanism and realizes strip steel deviation.
With respect to prior art, the utlity model has following remarkable advantage:
1, system response time is fast, precision is high, antijamming capability is strong, owing to adopted the detecting device of Programmable Logic Controller and band photoresistance, make system in the bigger environment of High Temperature High Pressure, strong vibration and pollution, still can produce quick response, and can keep high-precision signal detection and realization that the positional deviation correction of high-velocity zone steel is controlled.
2, stable work in work, reliability height adopt the digital valve hydraulic control technology to realize the correction control of band steel, and stability is greatly improved, and operation is also simple more, convenient.
3, have stronger versatility, digital hydraulic pressure deviation-rectifying system of the present utility model not only can be used for the sideslip control of strip mill production run, can also be generalized to industries such as weaving, papermaking, and practical, market potential is big, has good popularization value.
Description of drawings
Fig. 1 is the structural representation of deviation-rectifying system of the present utility model;
Fig. 2 is the fundamental diagram of photoelectric detector;
Fig. 3 is a kind of concrete enforcement circuit diagram of photoelectric detector;
Fig. 4 is the cut-away view of Programmable Logic Controller;
Fig. 5 is the control flow chart of Programmable Logic Controller;
Fig. 6 is the structure cut-open view of HSV high-speed switch valve;
Among the figure, 1-light source, 2-lens, 3-lens, the tested band of 4-, 5-photoresistance, 6-armature, 7-coil, 8-pole shoe, 9-valve body, 10-oil return ball valve, 11-separate pins, 12-fuel feeding ball valve.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Digital hydraulic pressure deviation-rectifying system of the present utility model as shown in Figure 1, mainly comprises photoelectric detector, FX
2N-MR48 Programmable Logic Controller and HSV series digit formula hydraulic actuating mechanism, HSV series digit formula hydraulic actuating mechanism is made up of digital valve and hydraulic cylinder; Photoelectric detector is with the voltage signal input Programmable Logic Controller of gathering, Programmable Logic Controller is output pulse width modulation signal control hydraulic actuating mechanism after comparing, calculating, hydraulic actuating mechanism is by the action of digital valve output pulse flow control hydraulic cylinder, the take-off lever of hydraulic cylinder links to each other with the base of uncoiler, hydraulic cylinder promotes uncoiler and moves, uncoiler so that to the band steel operating offset correct.Programmable Logic Controller FX
2N-MR48 is the control core of this deviation-rectifying system, and its critical component is to adopt high-speed switch valve as the hydraulic pressure conversion element in hydraulic actuating mechanism.
Described photoelectric detector adopts cadmium sulphide photoconductive cell to detect the position, edges of plate, as shown in Figure 2, light source 1 (can be a spot light lamp bulb, also can be LED or laser) light that sends converges through lens 2 is that parallel beam is invested lens 3, converged in the photoresistance 5 subsequently, arrive in the way of lens 3 at parallel beam, have part light to be subjected to blocking of tested band 4, the luminous flux phi that passes in the photoresistance 5 is reduced.According to the characteristic of photoresistance, when unglazed the photograph, photoresistance value (dark resistance) is very big, makes electric current in the circuit (dark current) very little; When photoresistance was subjected to the illumination of certain wavelength coverage, its resistance (light resistance) sharply reduced, and electric current increases rapidly in the circuit thereby make.And for example shown in Figure 3, R
1, R
2Be the photoresistance of same model, R
1Be installed in tested band below, R as measuring sensor
2Cover with light shield, play temperature compensation function.When tested band is in tram (interposition), by R
1, R
2, R
3And R
4The bridge balance of forming, differential amplifier output voltage U at this moment
0Value be 0; When tested band left avertence, the shading area reduces, photoresistance R
1Resistance reduces, the electric bridge out of trim, and differential amplifier is amplified this unbalance voltage, output voltage U
0Be negative value, it has reflected the direction and the size of band sideslip; Otherwise, when tested band right avertence, output voltage U
0For on the occasion of.Output voltage U
0Show by the display on the detecting device on the one hand, also be sent to the PLC Programmable Logic Controller simultaneously, for control system provides sampled signal.
FX
2N-MR48 Programmable Logic Controller is the control core of native system, has been embedded in programmable Control Software platform at controller.As shown in Figure 4, in Programmable Logic Controller, its importation is made up of photoresistance signal deteching circuit, starting switch, reset switch, and output comprises electromagnetic valve coil, pilot lamp and circuit etc.Pilot lamp is connected in parallel on each electromagnetic valve coil two ends, can save the number of pins of PLC like this; In order to protect the output relay of PLC, each fly-wheel diode in parallel at the solenoid valve two ends to prevent producing very high induction electromotive force or surge current when load disconnects, impacts to PLC output terminal and internal electric source simultaneously.
Each pin of FX2N-MR48 chip of Programmable Logic Controller links to each other with each terminal respectively, its input end X0～X7 pin connects the photoresistance signal deteching circuit, the X8 pin connects the electrothermal relay input terminal, and the X9 pin connects the reset switch input terminal, and the X10 pin connects the starting switch input terminal; At output terminal, Y0, Y1 pin connect the fast valve lead-out terminal respectively, and the Y2 pin connects JBQ alarm signal output ends.
As shown in Figure 5, to system's control of rectifying a deviation, its operation steps is as follows according to the software program of its embedding for Programmable Logic Controller:
1) in Programmable Logic Controller, presets an echo signal, the marginal position when described echo signal is normally moved for the band steel.Include sampling number in echo signal, sampling number is the expansion module FX by Programmable Logic Controller
2N4 passages of-4AD are provided with, and its scope is between 1～1096.
2) by the photoresistance signal deteching circuit band steel run location signal of input is judged, if wrong then obtain sampled signal again, if would be judged as correctly then signal value stored.Be by expansion module FX during judgement
2NNo. 29 cache register in the cache register of-4AD inside is provided with FX
2N-4AD judges automatically whether the signal of collection is wrong.
3) in controller, sampled signal and echo signal are compared, and calculate mean difference according to sampling number;
4) the Programmable Logic Controller dutycycle of regulating the output pulse width modulation signal, thereby the pulse voltage signal of control output according to the mean difference that calculates;
5) Programmable Logic Controller voltage pulse output signal drives hydraulic actuating mechanism and realizes strip steel deviation.
And for example shown in Figure 1, be connected with amplifier at the output terminal of Programmable Logic Controller, the digital valve of pulse-width signal input hydraulic pressure topworks after amplifier amplifies of Programmable Logic Controller output.Described digital valve is made of high-speed switch valve and solenoid directional control valve, and integrated two high-speed switch valves are controlled the left and right action of hydraulic cylinder respectively in digital valve, and solenoid directional control valve is according to the switch motion of the pulse-width signal control high-speed switch valve of input.
High-speed switch valve is the critical component of native system, as shown in Figure 6, high-speed switch valve adopts the two-position three way structure, it can directly be controlled with digital mode, needn't change through D/A, Programmable Logic Controller can require to send pulse-width signal according to control, the action of control electromechanical Structure Conversion electromagnet, open or close thereby drive high-speed switch valve, with the flow size and the flow direction of control hydraulic cylinder liquid stream.When the pulse signal of input when being low level, solenoid directional control valve outage, oil return ball valve 10 under the effect of oil return opening and oil-in pressure reduction to left movement, finally abut against on the oil return valve seat sealed seat surface, oil return opening is disconnected, and oil-in is communicated with the actuator port of upper end, realizes control action; When pulse signal is high level, the solenoid directional control valve energising, armature 6 produces electromagnetic push moves right the oil return ball valve by push rod and separate pins 11 together, come on its sealed seat surface up to fuel feeding ball valve 12, this moment, oil-in interrupted, oil return opening is opened, and realizes oil return, and be with steel to be in the normal position this moment.In this process, because carrying out Continuous Tracking to tested band, photoresistance detects, both played the effect that detects side-play amount, also play the effect of feedback simultaneously, thereby formed a closed loop servo system.
At this moment, the average discharge Q of high-speed switch valve is directly proportional with the dutycycle τ of pulse signal,
Be Q=τ Qmax
In the formula, τ pulse signal dutycycle, τ=Tp/Tf, Tf are pulse signal cycle, Tp is a pulsewidth, the maximum flow of Qmax high-speed switch valve,
C is a coefficient of flow, and Ap is the actual internal area of valve, and Δ p is the upstream and downstream pressure differential of valve, and ρ is a fluid density.
Since high-speed switch valve ceaselessly switch motion always in the course of the work, oil-in output series of pulses flow, and if regulate pulse duty cycle, the pulse flow size of oil-in output just can be controlled, and obtains and the proportional pulse flow of pulse duty cycle.The pulse flow of oil-in output is as controlled quentity controlled variable, and the left and right control cavity volume of input separate pins makes separate pins produce proportional displacement through the integral process of controlling cavity volume, and the main valve outlet of upper end has just obtained and the proportional flow of oil-in input duty cycle.
When the band steel departs from the tram, detected offset signal and sent into Programmable Logic Controller by photoelectric detector, Programmable Logic Controller output pulse width modulation signal is when band steel left during sideslip, Programmable Logic Controller sends control signal and makes high-speed switch valve F1 action, realizes left side correction; When band steel to the right during sideslip, Programmable Logic Controller sends control signal and makes high-speed switch valve F2 action, realizes right correction.The action of high-speed switch valve output pulse flow control hydraulic cylinder, the hydraulic cylinder that links to each other with uncoiler drives uncoiler and follows the tracks of the forward (FWD) position, and operating offset is corrected to the band steel.
Native system not only can be used for the sideslip control of strip mill production run, can also be generalized to industries such as weaving, papermaking, has stronger versatility.
Claims (2)
1, digital hydraulic pressure deviation-rectifying system based on PLC, it is characterized in that, mainly comprise photoelectric detector, Programmable Logic Controller and hydraulic actuating mechanism, photoelectric detector carries out real-time sampling by photoresistance to the position in the band steel operational process, and will be converted to voltage signal input Programmable Logic Controller with the deviation post of steel, Programmable Logic Controller is through comparing, calculate back output pulse width modulation signal control hydraulic actuating mechanism, hydraulic actuating mechanism is made up of digital valve and hydraulic cylinder, in digital valve, be provided with high-speed switch valve, the action of high-speed switch valve output pulse flow control hydraulic cylinder, the take-off lever of hydraulic cylinder links to each other with the base of uncoiler, hydraulic cylinder drives uncoiler and follows the tracks of the forward (FWD) position, and operating offset is corrected to the band steel.
2, the digital hydraulic pressure deviation-rectifying system based on PLC according to claim 1, it is characterized in that, the digital valve of pulse-width signal input hydraulic pressure topworks after amplifier amplifies of described Programmable Logic Controller output, digital valve comprises high-speed switch valve and solenoid directional control valve, and integrated two high-speed switch valves are controlled the left and right action of hydraulic cylinder respectively in digital valve, and solenoid directional control valve is according to the switch motion of the pulse-width signal control high-speed switch valve of input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201276140U CN201413468Y (en) | 2009-06-10 | 2009-06-10 | Digital hydraulic rectifying system based on PLC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201276140U CN201413468Y (en) | 2009-06-10 | 2009-06-10 | Digital hydraulic rectifying system based on PLC |
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| Publication Number | Publication Date |
|---|---|
| CN201413468Y true CN201413468Y (en) | 2010-02-24 |
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| CN2009201276140U Expired - Fee Related CN201413468Y (en) | 2009-06-10 | 2009-06-10 | Digital hydraulic rectifying system based on PLC |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102728627A (en) * | 2012-07-17 | 2012-10-17 | 江苏龙源金属科技有限公司 | Deviation-correction device of steel and aluminum composite rolling mill |
| CN103062149A (en) * | 2011-10-21 | 2013-04-24 | 美卓造纸机械公司 | Booster for digital hydraulic controller and method thereof |
| CN103639238A (en) * | 2013-11-15 | 2014-03-19 | 四川银河钢结构工程有限公司 | Uncoiler able to automatically control coiled plate's uncoiling speed |
| CN104390031A (en) * | 2014-11-04 | 2015-03-04 | 浙江大学 | High-pressure big-thrust two-position three-way ball valve structure |
| CN106475429A (en) * | 2015-08-31 | 2017-03-08 | 宝山钢铁股份有限公司 | Strip steel uncoiling automatic correction method and device |
| CN107866448A (en) * | 2017-11-01 | 2018-04-03 | 中色科技股份有限公司 | Centering control system |
| CN112756403A (en) * | 2020-12-18 | 2021-05-07 | 攀钢集团攀枝花钢钒有限公司 | Strip steel deviation rectifying system and method |
-
2009
- 2009-06-10 CN CN2009201276140U patent/CN201413468Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062149A (en) * | 2011-10-21 | 2013-04-24 | 美卓造纸机械公司 | Booster for digital hydraulic controller and method thereof |
| CN102728627A (en) * | 2012-07-17 | 2012-10-17 | 江苏龙源金属科技有限公司 | Deviation-correction device of steel and aluminum composite rolling mill |
| CN103639238A (en) * | 2013-11-15 | 2014-03-19 | 四川银河钢结构工程有限公司 | Uncoiler able to automatically control coiled plate's uncoiling speed |
| CN104390031A (en) * | 2014-11-04 | 2015-03-04 | 浙江大学 | High-pressure big-thrust two-position three-way ball valve structure |
| CN104390031B (en) * | 2014-11-04 | 2017-07-21 | 浙江大学 | High pressure high thrust two-bit triplet ball-valve structure |
| CN106475429A (en) * | 2015-08-31 | 2017-03-08 | 宝山钢铁股份有限公司 | Strip steel uncoiling automatic correction method and device |
| CN107866448A (en) * | 2017-11-01 | 2018-04-03 | 中色科技股份有限公司 | Centering control system |
| CN107866448B (en) * | 2017-11-01 | 2023-08-18 | 中色科技股份有限公司 | Centering control system |
| CN112756403A (en) * | 2020-12-18 | 2021-05-07 | 攀钢集团攀枝花钢钒有限公司 | Strip steel deviation rectifying system and method |
| CN112756403B (en) * | 2020-12-18 | 2022-08-16 | 攀钢集团攀枝花钢钒有限公司 | Strip steel deviation rectifying system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Tunmao Machinery Co., Ltd., Chongqing Assignor: Chongqing University of Technology Contract record no.: 2010500000043 Denomination of utility model: Digital hydraulic rectifying system based on PLC Granted publication date: 20100224 License type: Exclusive License Record date: 20100908 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100224 Termination date: 20120610 |