CN201650939U - Hydraulic pressure control system of vacuum laminating machine - Google Patents
Hydraulic pressure control system of vacuum laminating machine Download PDFInfo
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- CN201650939U CN201650939U CN 201020173792 CN201020173792U CN201650939U CN 201650939 U CN201650939 U CN 201650939U CN 201020173792 CN201020173792 CN 201020173792 CN 201020173792 U CN201020173792 U CN 201020173792U CN 201650939 U CN201650939 U CN 201650939U
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Abstract
A hydraulic pressure control system of a vacuum laminating machine is characterized by comprising a PLC, a frequency converter with a built-in PID control unit, a high-pressure gear pump, a pressure sensor and a piston cylinder. Compared with the prior art, the utility model has the beneficial effects of improving the stability, reducing the failure rate, saving the cost of an accessory without using expansive special pressure controllers and proportional valves, and saving energy. According to the existing laminating curve procedure, the average power of a high-pressure pump is improved by about 30% of the original one.
Description
Technical field
The utility model relates to a kind of vacuum pressing-combining machine, more specifically to a kind of vacuum pressing-combining machine hydraulic pressure control system.
Background technique
As shown in Figure 1, the control pressurer system of existing P CB vacuum pressing-combining machine comprises PLC, high-pressure gear pump, pressure controller, pressure transducer, hydraulic proportion valve, piston cylinder.
The effect of each parts is as follows:
PLC: set output correspondent voltage signal according to pressure, scope is 0-10VDC corresponding pressure value 0-3000PSI.PLC:Programmable logic Controller, programmable logic controller (PLC), the electronics of a kind of digital operation operation aims in industrial environment and uses and design.It adopts a class programmable memory, is used for its internally stored program, the actuating logic computing, and sequence control, regularly, counting and user oriented instruction such as arithmetical operation, and control various types of machineries or production process by numeral or analog I/O.
Pressure controller: setting pressure signal and the actual pressure signal that feeds back are compared, export control signal control hydraulic proportion valve then.
Hydraulic proportion valve:, export corresponding Flow-rate adjustment pressure according to the size of pressure controller control signal.
High-pressure gear pump: output constant high pressure pressure source 3000PSI is to hydraulic proportion valve.
Pressure transducer: detect the pressure of oil hydraulic cylinder output and feed back to pressure controller and carry out closed loop control, range of signal is 0-10VDC corresponding pressure value 0-3000PSI.
Introduce the pressure closed loop control procedure below:
High-pressure gear pump is worked always, output constant pressure 3000PSI, (0～3000PSI) is converted to analog voltage signal (0～10VDC) to PLC the pressure of setting, export to pressure controller, pressure controller compares by the signal to setting pressure signal and pressure sensor feeds back, according to the PID control mode, output control signal corresponding control hydraulic proportion valve, hydraulic proportion valve is opened the hydraulic oil of the flow of the corresponding corresponding size of aperture acquisition and is transported to oil hydraulic cylinder, because the pressure release effect of hydraulic system, this flow and pressure release have formed transient equiliblium, and this balance has been kept the pressure of corresponding size.
The shortcoming of prior art is: high-pressure gear pump always works in the pressure maximum output state, high pressure pump head quick abrasion, and the life-span is short, the rate of fault height; The required pressure of vacuum pressing-combining machine platen pressing often changes, and often much smaller than 3000PSI, but high-pressure gear pump always works in the pressure maximum output state, so the big utilization ratio of power loss is low, the motor feels hot serious (more than 70 ℃), the waste electric energy; Pressure controller and Proportional valve are the import special parts, price height, and controller poor stability, in case fault, inspection and adjustment are very difficult, influence maintenance efficiency and influence production.
Summary of the invention
The purpose of this utility model is that prior art is improved, a kind of vacuum pressing-combining machine hydraulic pressure control system is provided, can need not to adopt pressure controller and Proportional valve, and can regulate the pressure output of high-pressure gear pump according to the conversion of the required pressure of vacuum pressing-combining machine platen pressing, the technological scheme of employing is as follows:
Vacuum pressing-combining machine hydraulic pressure control system of the present utility model is characterized in that: comprise PLC, be built-in with frequency variator, high-pressure gear pump, pressure transducer, the piston cylinder of PID control unit;
Described PLC gives frequency variator according to predefined pressure (being the force value that the user imports PLC in advance) output correspondent voltage signal, and the voltage signal scope is 0～10VDC, corresponding pressure value 0～3000PSI;
The PID control unit of frequency variator compares the voltage signal of the above-mentioned voltage signal that receives with the reality that feeds back, the control frequency variator output corresponding frequencies of (using the frequency convertor PID control mode) then makes the voltage signal of the reality that above-mentioned voltage signal equals to feed back;
High-pressure gear pump is given oil hydraulic cylinder according to the FREQUENCY CONTROL motor speed output corresponding flow and the pressure of frequency variator output, and its frequency range is 0～50HZ, and corresponding range of pressure values is 0～3000PSI;
Pressure transducer detects the pressure of oil hydraulic cylinder output and feeds back to frequency variator and carries out closed loop control, and its output signal range is that the range of pressure values of 0～10VDC correspondence is 0～3000PSI.
The PID control unit is PID controller (proportional-integral derivative controller), is made up of ratio unit P, integral unit I and differentiation element D.By Kp, the setting of Ki and three parameters of Kd.The PID controller mainly is applicable to substantially linear and dynamic characteristic time invariant system.
The PID controller is feedback loop parts common in Industry Control Application.This controller compares data and a reference value of collecting, then this difference is used to calculate new input value, and the purpose of the input value that this is new is can allow the data of system reach or remain on reference value.Different with other simple control computings, the PID controller can be adjusted input value according to the occurrence rate of historical data and difference, can make system more accurate, more stable like this.Can prove by the method for mathematics, cause system to have under steady state error or the process situation repeatedly in other controlling methods, a PID feedback loop but can keep the stable of system.
(scope is 0～3000PSI) to be converted to analog voltage signal (scope is 0～10VDC) to PLC the pressure of setting, export to frequency variator, the PID control unit of frequency variator is by comparing the actual voltage signal of voltage signal (being the voltage signal of setting pressure) with pressure sensor feeds back of receiving, export the frequency of corresponding size according to frequency convertor PID control principle control frequency variator: when setting pressure is bigger than actual pressure, the frequency variator output frequency will increase gradually, actual pressure is also along with increasing gradually, it is big that the voltage signal of pressure transducer output simultaneously also and then becomes, up to the same big the time with the voltage signal of setting pressure, frequency variator with regard to stable operation in current frequency; Opposite, when setting pressure than actual pressure hour, the frequency variator output frequency will reduce gradually, actual pressure is also along with reducing gradually, the voltage signal of pressure transducer output also and then diminishes, up to the same big the time with the voltage signal of setting pressure, frequency variator with regard to stable operation in current frequency.Said frequencies control high-pressure gear pump rotating speed of motor, and the pressure (corresponding with setting pressure) that obtains corresponding size is transported to oil hydraulic cylinder with the hydraulic oil of flow, because the pressure release effect of hydraulic system, this flow and pressure release have formed transient equiliblium, and this balance has been kept the pressure of corresponding size.
According to motor speed frequency relation and pump machines roadability:
n1/n2＝f1/f2
Q1/Q2＝n1/n2
H1/H2＝(n1/n2)2
P1/P2＝(n1/n2)3
F in the formula---supply with the motor power frequency
Q---supply with the pipe network flow;
H---ductwork pressure;
P---electrical consumption power;
N---motor speed.
By following formula as can be known, when motor speed is reduced to 80% of rated speed, then supply with the pipe network flow and reduce to 80%, ductwork pressure is reduced to (80%) 2=64%, electrical consumption power then reduces to (80%) 3, and promptly 51.2%, remove electromechanics loss and influences such as motor copper, iron loss, energy-saving efficiency is also near 40%, and frequency control of motor speed reaches tangible energy-conserving action.
In addition, the soft start function of frequency variator and the characteristics of stepless speed control can realize the steady adjusting to flow, reduce simultaneously to start the working life of impacting and prolonging the pump housing and pipeline.
The relative prior art scheme of this programme, pressure controller and proportional electromagnetic valve have been saved, and replace pressure controller with the frequency variator of internal PID control function, it is simpler that controlling unit becomes, because frequency variator is that common accessory and technical development are fast, thus frequency variator with respect to existing special pressure controller, buy easilier, more cheap and intelligent, reliable performance, rate of fault is low; High-pressure gear pump is owing to the speed governing effect in addition, and at high pressure conditions, the gear pump load is little, wearing and tearing are little with respect to the continuous operation of existing scheme middle gear pump, and the life-span is elongated.
The utility model beneficial effect against existing technologies is:
1, improves stability, reduction rate of fault.Because high-pressure gear pump because of the variation in pressure speed governing, often is operated in lower-speed state, the pump head wearing and tearing are little, life-span increases by 500 above, and it is little that the motor feels hot, simultaneously the good stability of frequency variator own, normal at least 5 years working life, and original working pressure controller and Proportional valve mean failure rate 1 time/month.
2, save the accessory cost, need not be again with expensive special pressure controller and Proportional valve.And frequency variator is that frequency variator purchase commonly used is easy and cheap, approximately can save 100,000 yuan/platform/year after the invention process.
3, energy-conservation.By present pressing curve program, the average power consumption of high-pressure service pump approximately is original 30%.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model prior art;
Fig. 2 is the schematic block circuit diagram of the utility model preferred embodiment.
Embodiment
As shown in Figure 2, the vacuum pressing-combining machine hydraulic pressure control system in this preferred embodiment comprises PLC, is built-in with frequency variator, high-pressure gear pump, pressure transducer, the piston cylinder of PID control unit;
Described PLC gives frequency variator according to predefined pressure (being the force value that the user imports PLC in advance) output correspondent voltage signal, and the voltage signal scope is 0～10VDC, corresponding pressure value 0～3000PSI;
The PID control unit of frequency variator compares the voltage signal of the above-mentioned voltage signal that receives with the reality that feeds back, then with frequency convertor PID control mode control frequency variator output corresponding frequencies;
High-pressure gear pump is given oil hydraulic cylinder according to the FREQUENCY CONTROL motor speed output corresponding flow and the pressure of frequency variator output, and its frequency range is 0～50HZ, and corresponding range of pressure values is 0～3000PSI;
Pressure transducer detects the pressure of oil hydraulic cylinder output and feeds back to frequency variator and carries out closed loop control, and its output signal range is that the range of pressure values of 0～10VDC correspondence is 0～3000PSI.
(scope is 0～3000PSI) to be converted to analog voltage signal (scope is 0～10VDC) to PLC the pressure of setting, export to frequency variator, the PID control unit of frequency variator is by comparing the actual voltage signal of voltage signal (being the voltage signal of setting pressure) with pressure sensor feeds back of receiving, export the frequency of corresponding size according to frequency convertor PID control principle control frequency variator, this FREQUENCY CONTROL high-pressure gear pump rotating speed of motor, and obtain the pressure of corresponding size and the hydraulic oil of flow is transported to oil hydraulic cylinder, because the pressure release effect of hydraulic system, this flow and pressure release have formed transient equiliblium, and this balance has been kept the pressure of corresponding size.
The above is preferred embodiment of the present utility model only, is not to be used for limiting practical range of the present utility model; Be all equivalents of being done according to claim scope of the present utility model, be the utility model claim scope and cover.
Claims (1)
1. vacuum pressing-combining machine hydraulic pressure control system is characterized in that: comprise PLC, be built-in with frequency variator, high-pressure gear pump, pressure transducer, the piston cylinder of PID control unit;
Described PLC gives frequency variator according to predefined pressure output correspondent voltage signal;
The PID control unit of frequency variator compares the voltage signal of the above-mentioned voltage signal that receives with the reality that feeds back, and controls frequency variator output corresponding frequencies then;
High-pressure gear pump is given oil hydraulic cylinder according to the FREQUENCY CONTROL motor speed output corresponding flow and the pressure of frequency variator output;
Pressure transducer detects the pressure of oil hydraulic cylinder output and feeds back to frequency variator and carries out closed loop control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020173792 CN201650939U (en) | 2010-04-23 | 2010-04-23 | Hydraulic pressure control system of vacuum laminating machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020173792 CN201650939U (en) | 2010-04-23 | 2010-04-23 | Hydraulic pressure control system of vacuum laminating machine |
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| CN201650939U true CN201650939U (en) | 2010-11-24 |
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| CN 201020173792 Expired - Fee Related CN201650939U (en) | 2010-04-23 | 2010-04-23 | Hydraulic pressure control system of vacuum laminating machine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734269A (en) * | 2012-07-09 | 2012-10-17 | 重庆大学 | Energy-saving oil supply system of remanufactured heavy machine tool |
| CN102817885A (en) * | 2012-08-09 | 2012-12-12 | 恒天九五重工有限公司 | Power system |
| CN103352902A (en) * | 2013-06-14 | 2013-10-16 | 严松法 | Micro-flow hydraulic system pressure control device |
| CN103573728A (en) * | 2013-11-13 | 2014-02-12 | 中联重科股份有限公司 | Device, method and system for controlling hydraulic oil cylinder and engineering machine |
| CN104260409A (en) * | 2014-08-18 | 2015-01-07 | 合肥合锻机床股份有限公司 | Double-closed-loop redundancy pressure control system of coil hydraulic press |
| CN108240316A (en) * | 2016-12-27 | 2018-07-03 | 绍兴吉能纳米科技有限公司 | A kind of high-pressure pump relief valve method of numerical control |
| CN109322867A (en) * | 2018-11-07 | 2019-02-12 | 际华三五五皮革皮鞋有限公司 | Footwear pressing machine hydraulic control oil circuit |
-
2010
- 2010-04-23 CN CN 201020173792 patent/CN201650939U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734269A (en) * | 2012-07-09 | 2012-10-17 | 重庆大学 | Energy-saving oil supply system of remanufactured heavy machine tool |
| CN102734269B (en) * | 2012-07-09 | 2014-12-31 | 重庆大学 | Energy-saving oil supply system of remanufactured heavy machine tool |
| CN102817885A (en) * | 2012-08-09 | 2012-12-12 | 恒天九五重工有限公司 | Power system |
| CN103352902A (en) * | 2013-06-14 | 2013-10-16 | 严松法 | Micro-flow hydraulic system pressure control device |
| CN103352902B (en) * | 2013-06-14 | 2015-09-16 | 严松法 | Micro-flow hydraulic system pressure control device |
| CN103573728A (en) * | 2013-11-13 | 2014-02-12 | 中联重科股份有限公司 | Device, method and system for controlling hydraulic oil cylinder and engineering machine |
| CN103573728B (en) * | 2013-11-13 | 2017-02-01 | 中联重科股份有限公司 | Device, method and system for controlling hydraulic oil cylinder and engineering machine |
| CN104260409A (en) * | 2014-08-18 | 2015-01-07 | 合肥合锻机床股份有限公司 | Double-closed-loop redundancy pressure control system of coil hydraulic press |
| CN104260409B (en) * | 2014-08-18 | 2016-03-30 | 合肥合锻机床股份有限公司 | Coil hydraulic press pressure two close cycles redundancy control system |
| CN108240316A (en) * | 2016-12-27 | 2018-07-03 | 绍兴吉能纳米科技有限公司 | A kind of high-pressure pump relief valve method of numerical control |
| CN109322867A (en) * | 2018-11-07 | 2019-02-12 | 际华三五五皮革皮鞋有限公司 | Footwear pressing machine hydraulic control oil circuit |
| CN109322867B (en) * | 2018-11-07 | 2020-05-19 | 际华三五一五皮革皮鞋有限公司 | Hydraulic control oil circuit of shoe and boot press |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20140423 |