CN102773902A - Control system and method of continuous artificial plate hot press - Google Patents
Control system and method of continuous artificial plate hot press Download PDFInfo
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- CN102773902A CN102773902A CN2012102874947A CN201210287494A CN102773902A CN 102773902 A CN102773902 A CN 102773902A CN 2012102874947 A CN2012102874947 A CN 2012102874947A CN 201210287494 A CN201210287494 A CN 201210287494A CN 102773902 A CN102773902 A CN 102773902A
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Abstract
The invention discloses a control system and method of a continuous artificial plate hot press. The control system comprises a PLC (Programmable Logic Controller), a hydraulic cylinder, a displacement sensor, a pressure sensor, an amplifier, a control valve, and a computer or a touch screen which is connected with the PLC and provides a man-machine interface, wherein the PLC comprises a CPU (Central Processing Unit), a distributed type I/O (Input/Output) system, an analog quantity input module and an analog quantity output module; the analog quantity input module and the analog quantity output module are respectively connected with the CPU through the distributed type I/O system; the displacement sensor and the pressure sensor are respectively connected with the PLC; and the servo valve amplifier is respectively connected with a servo valve and the PLC. The control method disclosed by the invention adopts a correction program in the PLC to correct pressure and displacement deviation signals generated in a correction system; and hydraulic pressure and a position line of oil in the hydraulic cylinder in the system are controlled through the servo valve. The control system disclosed by the invention has the advantages of high reliability, strong interference resistance, easiness for programming, and high precision in thickness setting of an artificial plate.
Description
Technical field
The invention belongs to continuous hot press and make the field, particularly a kind of wood-based plate continuous hot press control system and control method thereof.
Background technology
The wood-based plate continuous flat press is being represented the highest level of international wood-based plate production equipment, and in Wood-based Panel Production equipment such as existing medium density fibre board (MDF), particieboard, continuous flat press has become one of most important equipment at present.During fiberboard at home and particieboard were produced, the use of continuous flat press had become a kind of trend.
Continuous hot press is the core of continuous flat press production line, and what a lot of continuous flat press continuous hot press partly adopted at present is industrial computer control system, to environmental requirement is high, program is complicated, maintainability is poor, reliability is lower.Basically the control system of continuous hot press adopts magnetic valve to control the capacity of the hydraulic pressure in the hydraulic jack at present.Because magnetic valve is the directional control valve of switching mode, can only control the direction of motion of fluid, can not control the size of fluid flow, thereby reduce the fixed thick precision of hot press.
Summary of the invention
One object of the present invention is to overcome the shortcoming of prior art with not enough, provide a kind of can carry out wood-based plate high-precision fixed thick, and continuous hot press control system easy to maintenance, that programming is simple and reliability is high.
Another object of the present invention is to utilize above-mentioned control system to realize the control method of continuous hot press.
In order to reach above-mentioned first purpose; The present invention adopts following technical scheme to realize: a kind of wood-based plate continuous hot press is controlled system; Comprise PLC (Programmable Logic Controller, programmable logic controller (PLC)), displacement transducer and pressure sensor, said displacement transducer is connected with PLC respectively with pressure sensor; Native system also comprises amplifier and control valve, and said amplifier is connected with PLC with control valve respectively; Wherein said amplifier is servo valve amplifier or proportional amplifier, and said control valve is servo valve or proportioning valve.
Preferably; Said PLC comprises CPU, distributed I/O system and the analog quantity input module, analog output module, digital quantity input module and the digital quantity output module that are connected with CPU respectively through distributed I/O system, and the digital quantity input module of said PLC is connected with sense switch; Said displacement transducer is connected with the analog quantity input module of PLC respectively with pressure sensor or directly is connected with CPU through bus respectively, and said amplifier is connected with the analog output module of PLC or directly is connected with CPU through bus.
Preferably, this control system also comprises computer or the touch-screen that is connected with PLC.
In order to reach above-mentioned second purpose, the present invention adopts following technical scheme: a kind of control method based on above-mentioned wood-based plate continuous hot press control system may further comprise the steps:
(1) in the control system, sets displacement setting value and pressure set points according to the fixed thick and level pressure demand of continuous hot press;
(2) pressure sensor converts the hydraulic pressure signal of hydraulic jack into the signal of telecommunication, and sends CPU to, converts the hydraulic pressure signal that receives to the pressure feedback value by CPU; Displacement transducer converts the displacement signal of hydraulic jack to the signal of telecommunication, and sends CPU to, and CPU converts the displacement signal that receives to the Displacement Feedback value;
(3) pressure set points that will in step (1), set of CPU and pressure feedback value compare and obtain the pressure divergence signal, then the pressure divergence signal are handled; The displacement setting value that in step (1), set and the Displacement Feedback value of displacement transducer compare and obtain the offset deviation signal, then the displacement deviation signal are handled;
(4) send amplifier to after will passing through the analog signals of analog signals that pressure divergence signal and offset deviation signal after step (3) is handled convert the pressure divergence signal respectively to and offset deviation signal; Amplifier sends control valve to after the analog signals of the analog signals of pressure divergence signal and offset deviation signal is amplified; After control valve receives the analog signals of analog signals and offset deviation signal of pressure divergence signal; Converting the analog signals of the analog signals of pressure divergence signal and offset deviation signal into hydraulic pressure can export; Make on the pressure set points that the hydraulic pressure system of remaining in the hydraulic jack provides, make on the displacement setting value that the fluid position line system of remaining in the hydraulic jack provides.
Preferably; Said step (2) pressure sensor and displacement transducer through analog quantity input module or CPU with hydraulic pressure signal and displacement signal convert to respectively feed back to CPU after hydraulic pressure data signal and the displacement data signal after, CPU converts the hydraulic pressure data signal that receives to the pressure feedback value; CPU converts the displacement data signal that receives to the Displacement Feedback value.
Preferably, will pass through the analog signals that pressure divergence signal and offset deviation signal after step (3) is handled convert the pressure divergence signal respectively to and the analog signals of offset deviation signal by the analog output module of PLC or CPU in the said step (4); In the said step (4) when pressure feedback value during less than said pressure set points; The spool action of the analog output module through PLC or the analog signals control amplifier drive control valve of CPU output pressure deviation signal, thus make the pressure feedback value infinitely approach pressure set points; When said Displacement Feedback value during less than said displacement setting value; The spool action of the analog signals control amplifier drive control valve of analog output module through PLC or CPU output displacement deviation signal, thus make the Displacement Feedback value infinitely approach the displacement setting value.
Preferably, said analog signals is voltage or current signal.
The present invention has following advantage and effect with respect to prior art:
(1) the control employing PLC of system of the present invention is as controller; It is a kind of computer control that designs under the industrial environment that aims at; Have that reliability height, antijamming capability are strong, programming easily and characteristics such as debugging maintenance is convenient; Thereby the control system that makes continuous hot press is more reliable, safety and practicality, realizes more convenient.
(2) control system's employing servo valve of the present invention or proportioning valve are controlled fluid flow and the pressure that flows in the hydraulic jack, have realized throttling control and pressure control to flow with automatically controlled mode.Because servo valve and proportioning valve have the advantage that dynamic response is fast, highly sensitive and control accuracy is high; Make control of the present invention system to carry out high-precision hydraulic pressure and position line control, thereby realize the high accuracy of slab under different pressures accurately thick calmly the fluid in the hydraulic jack.
(3) control of the present invention system with the hydraulic pressure of fluid in the hydraulic jack and Position Control on fixed pressure setting value and displacement setting value; The pressing plate that makes continuous hot press be used to suppress artifical board material like this is in desired location all the time; So control of the present invention system control hot press has down improved the production efficiency of wood-based plate greatly as long as under the situation that satisfies wood-based plate raw material supply abundance, can realize continuous pressing plate.
Description of drawings
Fig. 1 is that the present invention controls system block diagram.
Fig. 2 is that the present invention controls system liquid pressure pressure adjusting control block diagram.
Fig. 3 is that the present invention controls system oil liquid position line adjusting control block diagram.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but embodiment of the present invention is not limited thereto.
Embodiment
As shown in Figure 1; A kind of wood-based plate continuous hot press of present embodiment is controlled system; Comprise that PLC, hydraulic jack, displacement transducer, pressure sensor, servo valve amplifier, servo valve, sense switch, motor and being used to of being connected with PLC provide HMI (Human Machine Interface; Man-machine interface) computer or touch-screen; PLC comprises CPU, distributed I/O system and through digital quantity input module, digital quantity output module, analog quantity input module and analog output module that distributed I/O system is connected with CPU, displacement transducer is connected with PLC with pressure sensor, and the servo valve amplifier is connected with PLC with servo valve respectively; Sense switch is connected with the digital quantity input module of PLC, is used for detecting the signal of each parts action of control system; Wherein displacement transducer is connected with the analog quantity input module of PLC respectively with pressure sensor or directly is connected with CPU through bus respectively; Servo amplifier is connected with the analog output module of PLC or directly is connected with CPU through bus; The displacement transducer of present embodiment is connected with the analog quantity input module of PLC with pressure sensor, and the servo amplifier of present embodiment is connected with the analog output module of PLC.
The PLC of present embodiment comprises self adaptation adjusting program and proofreaies and correct control program; Wherein proofreading and correct control program is the PI (Propotional-Integrate of PLC; Ratio-integration) PID of control program, PLC (Propotional-Integrate-Differential, proportional-integral-differential) control program or be the program of forming jointly by the PI control program of PLC and PID control program.
Present embodiment adopts is that the PID control program of PLC is as proofreading and correct control program.
Present embodiment is kept watch on, is provided with and operate system through HMI.
Regulate control block diagram and fluid position line adjusting control block diagram for the hydraulic pressure of present embodiment control system as shown in Figures 2 and 3.Specifically the step of the control method of present embodiment control system is following:
(1) in the control system, sets a displacement setting value and pressure set points according to the fixed thick and level pressure demand of continuous hot press.
(2) pressure sensor in the hydraulic jack converts the hydraulic pressure signal of hydraulic jack into the signal of telecommunication; And the analog quantity input module through PLC sends CPU to after converting the analog signals of hydraulic pressure to data signal, and CPU calls and converts the pressure feedback value to after the pressure sensor signal conversion program is handled the data signal of hydraulic pressure; Displacement transducer in the hydraulic jack converts the displacement signal of hydraulic jack to the signal of telecommunication; And send CPU to behind the analog signals conversion digital signal of analog quantity input module with displacement signal through PLC, CPU calls and converts the Displacement Feedback value to after the displacement transducer signal conversion program is handled the data signal of displacement.
(3) after CPU receives the signal of pressure sensor and displacement transducer feedback; The pressure set points that in the control system, set and the pressure feedback value of pressure sensor compare and obtain the pressure divergence signal, call PID control program and the self adaptation program of regulating by CPU the pressure divergence signal is handled;
The displacement setting value that in the control system, set and the Displacement Feedback value of displacement transducer compare and obtain the offset deviation signal, call PID control program and self-adaptive controlled routine contraposition by CPU and move deviation signal and handle.
(4) send servo amplifier to after being converted to the analog signals of analog signals and offset deviation signal of pressure divergence signal by the analog output module of PLC respectively through the pressure divergence signal after the PID control program of CPU and the self adaptation adjusting routine processes and offset deviation signal; Servo amplifier sends servo valve to after the analog signals that receives is amplified; After servo valve receives signal; Converting this signal into hydraulic pressure can export, pressure set points and displacement setting value that hydraulic pressure and the fluid position line system of remaining in the hydraulic jack are provided.The pressure feedback value that detects when pressure sensor is during less than the pressure set points in the step (1); The analog signals of the analog output module output pressure deviation signal through PLC is controlled the spool action that servo amplifier continues to drive servo valve, thereby makes the pressure feedback value infinitely approach pressure set points.When the detected Displacement Feedback value of displacement transducer during less than the displacement setting value in the step (1); Analog signals through PLC analog output module output displacement deviation signal is controlled the spool action that servo amplifier continues to drive servo valve, thereby makes the Displacement Feedback value infinitely approach the displacement setting value.
The pressure divergence that produces after PID control program in the present embodiment control system in the employing PLC system is compared with the pressure set points of system to the pressure feedback value of pressure sensor carries out ratio, integration respectively and differentiates, the action that the uniform adjusting pressure signal of output control removes to make servo valve; The Displacement Feedback value of the displacement transducer offset deviation that the back produces of comparing with the displacement setting value of system is carried out ratio, differential and integral operation respectively, export the action that uniform adjusting flow signal removes to control servo valve.When carrying out the pressure adjusting, do safeguard protection by the Displacement Feedback value; When carrying out the displacement adjusting, do safeguard protection by the pressure feedback value.This control method has response rapidly, effectively eliminates the characteristics of error, and the system that makes can control the hydraulic pressure and the fluid position line in the hydraulic jack more accurately, has further improved the operating accuracy of continuous hot press.
Wherein present embodiment has called self adaptation and has regulated program on the basis of calling the PID control program, utilizes the main body velocity interval on the hot press production line to regulate proportionality coefficient Kp, integral coefficient Ki and differential coefficient Kd automatically.With even running, the overshoot of guaranteeing to proofread and correct control program appropriate and stabilization time suitable, thereby reach hydraulic pressure and the purpose of the fluid position line in the steady switching hydraulic jack, improved the quality of production of wood-based plate.
The control system of present embodiment adopts servo valve to control hydraulic pressure and the flow that flows in the hydraulic jack; Continue to drive the spool action of servo valve through the analog signals control servo amplifier of PLC analog output module output; Thereby make the pressure feedback value infinitely approach pressure set points, the Displacement Feedback value is infinitely approached the displacement setting value.Because servo valve has the advantage that dynamic response is fast, highly sensitive and control accuracy is high; Make control of the present invention system to carry out high-precision hydraulic pressure and position line control, thereby realize the high accuracy of slab under different pressures accurately thick calmly the fluid in the hydraulic jack.
The control system of present embodiment is controlled at the hydraulic pressure in the hydraulic jack on the fixed pressure setting value; The position line of fluid in the hydraulic jack is controlled on the fixing displacement setting value; The pressing plate that makes continuous hot press be used to suppress artifical board material is in desired location all the time, so can realize continuous pressing plate at control of the present invention system control hot press down as long as satisfying under the situation of wood-based plate raw material supply abundance.
The foregoing description is a preferred implementation of the present invention, but embodiment of the present invention is not restricted to the described embodiments, and can replace with proportional amplifier like servo amplifier, and servo valve replaces with proportioning valve.Present embodiment lieutenant colonel positive control program also is the PI control program or calls the PI control program jointly and the PID control program.In addition when pressure sensor directly is connected with the CPU of PLC through bus with displacement transducer, pressure sensor and the displacement transducer CPU through PLC feeds back to PLC after converting hydraulic pressure signal and displacement signal to data signal; When servo amplifier directly was connected with the CPU of PLC through bus, the signal after the correction control program of PLC is handled was converted to analog signals by the CPU of PLC.Do not deviate from change, the modification done under spirit of the present invention and the principle, substitute, combination, simplify by other any, all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. a wood-based plate continuous hot press is controlled system; Comprise PLC, displacement transducer and pressure sensor, said displacement transducer is connected with PLC respectively with pressure sensor, it is characterized in that; Also comprise amplifier and control valve, said amplifier is connected with PLC with control valve respectively; Wherein said amplifier is servo valve amplifier or proportional amplifier, and said control valve is servo valve or proportioning valve.
2. wood-based plate continuous hot press according to claim 1 is controlled system; It is characterized in that; Said PLC comprises CPU, distributed I/O system and the analog quantity input module, analog output module, digital quantity input module and the digital quantity output module that are connected with CPU respectively through distributed I/O system, and the digital quantity input module of said PLC is connected with sense switch; Said displacement transducer is connected with the analog quantity input module of PLC respectively with pressure sensor or directly is connected with CPU through bus respectively, and said amplifier is connected with the analog output module of PLC or directly is connected with CPU through bus.
3. wood-based plate continuous hot press according to claim 1 is controlled system, it is characterized in that, also comprises the computer or the touch-screen that are connected with PLC.
4. the control method based on the said wood-based plate continuous hot press control of claim 2 system is characterized in that, may further comprise the steps:
(1) in the control system, sets displacement setting value and pressure set points according to the fixed thick and level pressure demand of continuous hot press;
(2) pressure sensor converts the hydraulic pressure signal of hydraulic jack into the signal of telecommunication, and sends CPU to, converts the hydraulic pressure signal that receives to the pressure feedback value by CPU; Displacement transducer converts the displacement signal of hydraulic jack to the signal of telecommunication, and sends CPU to, and CPU converts the displacement signal that receives to the Displacement Feedback value;
(3) pressure set points that will in step (1), set of CPU and pressure feedback value compare and obtain the pressure divergence signal, then the pressure divergence signal are handled; The displacement setting value that in step (1), set and the Displacement Feedback value of displacement transducer compare and obtain the offset deviation signal, then the displacement deviation signal are handled;
(4) send amplifier to after will passing through the analog signals of analog signals that pressure divergence signal and offset deviation signal after step (3) is handled convert the pressure divergence signal respectively to and offset deviation signal; Amplifier sends control valve to after the analog signals of the analog signals of pressure divergence signal and offset deviation signal is amplified; After control valve receives the analog signals of analog signals and offset deviation signal of pressure divergence signal; Converting the analog signals of the analog signals of pressure divergence signal and offset deviation signal into hydraulic pressure can export; Make on the pressure set points that the hydraulic pressure system of remaining in the hydraulic jack provides, make on the displacement setting value that the fluid position line system of remaining in the hydraulic jack provides.
5. control method according to claim 4; It is characterized in that; Said step (2) pressure sensor and displacement transducer analog quantity input module or the CPU through PLC with hydraulic pressure signal and displacement signal convert to respectively feed back to CPU after hydraulic pressure data signal and the displacement data signal after, CPU converts the hydraulic pressure data signal that receives to the pressure feedback value; CPU converts the displacement data signal that receives to the Displacement Feedback value.
6. control method according to claim 4; It is characterized in that, will pass through the analog signals that pressure divergence signal and offset deviation signal after step (3) is handled convert the pressure divergence signal respectively to and the analog signals of offset deviation signal by the analog output module of PLC or CPU in the said step (4); In the said step (4) when pressure feedback value during less than said pressure set points; The spool action of the analog output module through PLC or the analog signals control amplifier drive control valve of CPU output pressure deviation signal, thus make the pressure feedback value infinitely approach pressure set points; When said Displacement Feedback value during less than said displacement setting value; The spool action of the analog signals control amplifier drive control valve of analog output module through PLC or CPU output displacement deviation signal, thus make the Displacement Feedback value infinitely approach the displacement setting value.
7. according to claim 4 or 6 described control methods, it is characterized in that said analog signals is voltage or current signal.
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| CN2012102874947A CN102773902A (en) | 2012-08-13 | 2012-08-13 | Control system and method of continuous artificial plate hot press |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102621906A (en) * | 2012-03-30 | 2012-08-01 | 江苏金茂制链有限公司 | Method for locating control of hydraulic cylinder |
| CN104181858A (en) * | 2014-09-15 | 2014-12-03 | 沈阳飞机工业（集团）有限公司 | Plate storage device control system |
| CN105834338A (en) * | 2016-05-16 | 2016-08-10 | 中国重型机械研究院股份公司 | High precision control system and method for forging oil press |
| CN106182228A (en) * | 2016-07-22 | 2016-12-07 | 四川省青城机械有限公司 | A kind of numerical control tenon milling machine system and operational approach thereof |
| CN106252638A (en) * | 2016-10-11 | 2016-12-21 | 大连海事大学 | A kind of silicon/oxide composite negative pole material with Lithium metasilicate boundary layer and preparation method |
| CN107065840A (en) * | 2017-06-07 | 2017-08-18 | 合肥工业大学 | A kind of bipolar plates prepare the remote control and diagnostic system and its method of hot press |
| CN108527759A (en) * | 2018-03-21 | 2018-09-14 | 金华启创智能设备有限公司 | Pressure accuracy-control system in full-automatic foam molding machine |
| CN111070772A (en) * | 2019-11-28 | 2020-04-28 | 枣庄冠龙机械有限公司 | Energy-saving control system of hydraulic machine |
| CN111412187A (en) * | 2020-04-03 | 2020-07-14 | 东方电气集团东方汽轮机有限公司 | Automatic control method and system for multi-oil-cylinder synchronous motion |
| CN112684820A (en) * | 2020-12-31 | 2021-04-20 | 中钢集团邢台机械轧辊有限公司 | Forging press pressure measurement control system and method |
| CN114232372A (en) * | 2021-12-28 | 2022-03-25 | 浙江中控技术股份有限公司 | Papermaking pressing system and control method |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621906B (en) * | 2012-03-30 | 2014-05-07 | 江苏金茂制链有限公司 | Method for locating control of hydraulic cylinder |
| CN102621906A (en) * | 2012-03-30 | 2012-08-01 | 江苏金茂制链有限公司 | Method for locating control of hydraulic cylinder |
| CN104181858A (en) * | 2014-09-15 | 2014-12-03 | 沈阳飞机工业（集团）有限公司 | Plate storage device control system |
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| CN106182228B (en) * | 2016-07-22 | 2018-06-15 | 四川省青城机械有限公司 | A kind of numerical control tenon milling machine system and its operating method |
| CN106182228A (en) * | 2016-07-22 | 2016-12-07 | 四川省青城机械有限公司 | A kind of numerical control tenon milling machine system and operational approach thereof |
| CN106252638A (en) * | 2016-10-11 | 2016-12-21 | 大连海事大学 | A kind of silicon/oxide composite negative pole material with Lithium metasilicate boundary layer and preparation method |
| CN107065840A (en) * | 2017-06-07 | 2017-08-18 | 合肥工业大学 | A kind of bipolar plates prepare the remote control and diagnostic system and its method of hot press |
| CN107065840B (en) * | 2017-06-07 | 2019-07-05 | 合肥工业大学 | A kind of bipolar plates prepare the long-range control and diagnostic system and its method of hot press |
| CN108527759A (en) * | 2018-03-21 | 2018-09-14 | 金华启创智能设备有限公司 | Pressure accuracy-control system in full-automatic foam molding machine |
| CN108527759B (en) * | 2018-03-21 | 2024-04-19 | 重庆龙升巨威信息技术咨询服务中心 | Accurate pressure control system in full-automatic foam molding machine |
| CN111070772A (en) * | 2019-11-28 | 2020-04-28 | 枣庄冠龙机械有限公司 | Energy-saving control system of hydraulic machine |
| CN111412187A (en) * | 2020-04-03 | 2020-07-14 | 东方电气集团东方汽轮机有限公司 | Automatic control method and system for multi-oil-cylinder synchronous motion |
| CN111412187B (en) * | 2020-04-03 | 2022-05-10 | 东方电气集团东方汽轮机有限公司 | Automatic control method and system for multi-oil-cylinder synchronous motion |
| CN112684820A (en) * | 2020-12-31 | 2021-04-20 | 中钢集团邢台机械轧辊有限公司 | Forging press pressure measurement control system and method |
| CN114232372A (en) * | 2021-12-28 | 2022-03-25 | 浙江中控技术股份有限公司 | Papermaking pressing system and control method |
| CN114232372B (en) * | 2021-12-28 | 2023-12-05 | 浙江中控技术股份有限公司 | Papermaking squeezing system and control method |
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Application publication date: 20121114 |