CN1666855A - Variable frequency control system of ejection forming machine - Google Patents
Variable frequency control system of ejection forming machine Download PDFInfo
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- CN1666855A CN1666855A CN 200410097712 CN200410097712A CN1666855A CN 1666855 A CN1666855 A CN 1666855A CN 200410097712 CN200410097712 CN 200410097712 CN 200410097712 A CN200410097712 A CN 200410097712A CN 1666855 A CN1666855 A CN 1666855A
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Abstract
The invention discloses the frequency conversion control system of the ejection forming machine, which mainly makes the controller of the ejection machine match with the different conditions of the ejection forming machine to cast and procedure analyze, and to control the pressure valve and the flux proportion. The controller can control the ejection forming machine and the frequency converser and connect the electromotor and the hydraulic oil pump to the converser to reduce the energy consumption and improve the manufacturing efficiency.
Description
Technical field
The present invention relates to a kind of frequency-changing control system of Jet forming machine.
Background technology
Jet forming machine is one of production facility of the normal use of industry now, and Jet forming machine power consumption is quite big at work, account for about 30% of production cost, and in the operation acts process, the required energy of different actions is also inequality and differ greatly, more than its gap can reach more than 10 times, so cause the energy to waste greatly, therefore how reducing energy resource consumption had been numerous problems that manufacturer was concerned about.Original existing how tame producer directly has been installed at frequency converter the motor place of Jet forming machine, as shown in Figure 4, its composition mode is: Jet forming machine 1 ', frequency converter 2 ' are provided with ejaculator controller 11 ', frequency converter controller 21 ' respectively, this frequency converter controller 21 ' is connected with ejaculator controller 11 ', can operate ejaculator controller 11 ' again and assign instruction and make frequency converter controller 21 ' control frequency converter 2 ' output low frequency reduce rotating speed again, and reduce energy loss with control motor 4 ', hydraulic oil pump 5 '.
Yet still there is following problem in aforementioned manner:
1, because the every condition of molding of machine is stipulated voluntarily by operating personnel, when when needing the condition of low discharge running, then the rotating speed of motor 4 ' can reduce, but motor 4 ' long-term low-speed running, will cause that 4 ' overheated causing of motor burn.Determine that mode has very big randomness so the low-speed running of this motor 4 ' is operated by the client, and easily cross the low motor 4 ' that causes and burn because of adjustment frequency converter 2 ' output frequency.
When not only the operator improves the energy-conservation restriction of low-limit frequency but also will influence energy-saving effect.
2, during hydraulic oil pump 5 ' regular event, the restriction of minimum speed and maximum speed is arranged, when the low-speed running of motor 4 ' is determined by client (operating personnel) operation, if operand value is improper, in the life-span that long-term use will reduce hydraulic oil pump 5 ' down, and easily cause hydraulic oil pump 5 ' fault.
3, as shown in Figure 5, because Jet forming machine 1 ' and frequency converter 2 ' are respectively by two different ejaculator controllers 11 ', frequency converter controller 21 ' is controlled adjustment, but because of ejaculator controller 11 ' must be assigned another frequency converter controller 21 ' of instruction control earlier, again by the 2 ' action of frequency converter controller 21 ' control frequency converter, thereby Jet forming machine 1 ' has the deferred reaction time with frequency converter 2 ', and when causing Jet forming machine 1 ' accelerated motion, the different situations of action slope of Jet forming machine 1 ' and frequency converter 2 ', and this delay and Different Slope situation will cause product to produce sunken lacking, thereby it is slow to have response speed, the disappearance that production cycle is long.
4, can't overcome frequency converter minimum stable engine speed binding hours problem: shown in Fig. 4,6, because pressure fluctuation was big when frequency converter 2 ' frequency was low, promptly cause pressure to change with changes in flow rate, and pressurize directly influences quality surface quality and internal pressure to the degree of stability of pressure, but frequency converter 2 ' is if setting output frequency by operating personnel crosses when low, will cause because of pressure transient and influences the product quality situation.
5, Jet forming machine 1 ' when pressure changes in the process of any action no matter can't provide the corresponding different type of machines of frequency converter 2 ' output frequency, different pressures, traffic demand to make different switching (being also can not improve motor 4 ' rotating speed during the low pressure action to reduce moulding cycle time).
6, in accurate ejection formation process during demand high pressure low discharge, because frequency converter controller 21 ' is to accept the ejaculator controller 11 ' rotary speed instruction of assigning, therefore can produce the state of motor 4 ', hydraulic oil pump 5 ' low-speed running, this moment is except unfavorable to motor 4 ' motor and hydraulic oil pump 5 ', the pressure of hydraulic system is also unstable, fully can't ejection formation, therefore when accurate ejection formation, can't use frequency converter 2 ' at present, and must intact order use power frequency, promptly traditional mode of operation.
Summary of the invention
The object of the present invention is to provide a kind of frequency-changing control system of Jet forming machine, it is guaranteeing to produce under the quality state of product, utilize each different condition demand of Jet forming machine work and the hydraulic principle converter technique of specialty to reach Jet forming machine reduction energy resource consumption and promote production efficiency, reduce production costs, increase user's competitiveness.
For achieving the above object, technical solution of the present invention is: a kind of frequency-changing control system of Jet forming machine, it mainly makes the ejaculator controller of Jet forming machine cooperate the different injecting conditions and the process analysis procedure analysis of Jet forming machine, and controlled pressure valve, flow proportional control valve action, and this ejaculator controller can be controlled Jet forming machine and frequency converter action, and is connected with motor and hydraulic oil pump at frequency converter; This ejaculator controller is with the corresponding maximum output frequency of frequency converter and the upper limit flow set of different type of machines and corresponding each action demand again; The ejaculator controller is set the upper and lower limit rotating speed restriction of motor, hydraulic oil pump again, when required flow is lower than the minimum speed of hydraulic oil pump requirement, the ejaculator controller makes frequency converter output set lower frequency limit, control motor, hydraulic oil pump are in lower limit slow-speed of revolution action, and the ejaculator controller is controlled the required flow of flow proportional control valve control action process simultaneously again; And when required flow was higher than the minimum speed of hydraulic oil pump requirement, the course of action actual flow was by inverter control motor, hydraulic oil pump action; When required operating pressure is low, in the hydraulic oil pump rotating speed upper limit, make frequency converter promote frequency by the ejaculator controller, and control motor, hydraulic oil pump lifting rotating speed and increasing hydraulic oil pump discharge-amount.
Described ejaculator controller is provided with speed-raising ejection formation options button, and this speed-raising ejection formation options button selects for use the different demands in Shi Keyi action position to promote frequency converter frequency, and responsiveness and minimizing time action cycle when promoting low pressure.
The control of described frequency converter is integrated with the ejaculator controller and is made the action slope of Jet forming machine, frequency converter consistent.
After adopting such scheme, the ejaculator controller of Jet forming machine of the present invention cooperates the different condition and the injection moulding process analysis of Jet forming machine, and controlled pressure valve, flow proportional control valve action, and this ejaculator controller can be controlled Jet forming machine and frequency converter action simultaneously, and is connected with electronic and hydraulic oil pump in frequency converter.And the present invention is analyzed the different condition demand of each action of Jet forming machine, and in conjunction with hydraulic principle and motor, all use key electric component hydraulic oil pump, the characteristic of hydraulic package is taken all factors into consideration interior, the feasible frequency conversion principle that original only variable ratio frequency changer is changed rotating speed and then change flow, be evolved into both relevant with the different condition demand of each action, also relevant with working pressure, and then it is relevant with flow, and take the characteristic of using assembly into account, energy-conservation principle will originally only be used for, changing becomes except energy savings, promote running speed between more can be in due course and then increase production efficiency, and can become energy-conservation and efficient frequency conversion Jet forming machine.
Description of drawings
Fig. 1 is a control system schematic diagram of the present invention;
Fig. 2 is injecting condition of the present invention and process analysis procedure analysis schematic diagram;
Fig. 3 is that the slope of Jet forming machine of the present invention and frequency converter overlaps schematic diagram;
Fig. 4 is that known Jet forming machine uses the Frequency Converter Control system schematic;
Fig. 5 is the known Jet forming machine different action slope with the ejection formation facility of a frequency converter schematic diagram when using frequency converter;
Fig. 6 is known frequency converter frequency pressure transient schematic diagram when low.
Among the figure:
1 Jet forming machine, 11 ejaculator controllers
111 speed-raising ejection formation options button 2 injecting conditions and process analysis procedure analyses
3 pressure valve, 4 flow proportional control valves
5 frequency converters, 6 motor
7 hydraulic oil pumps, 1 ' Jet forming machine
11 ' ejaculator controller, 2 ' frequency converter
21 ' frequency converter controller, 3 ' pressure valve
4 ' motor, 5 ' hydraulic oil pump
The specific embodiment
See also Fig. 1, the present invention makes the ejaculator controller of Jet forming machine 1 11 cooperate the different injecting conditions and the process analysis procedure analysis 2 of Jet forming machine 1, and controlled pressure valve 3, flow proportional control valve 4 actions, and this ejaculator controller 11 can be controlled Jet forming machine 1 and frequency converter 5 actions, and is connected with motor 6 and hydraulic oil pump 7 in frequency converter 5.
And setting of the present invention and manner of execution are as follows:
1, sees also Fig. 2, Jet forming machine 1 frequency division of the big or small type of difference is listed, and different condition in the injection moulding process analyzed, advance → inject pressurize (multistage) → preformed → cooling → seat as mold closing (multistage) → seat to move back → die sinking (3 sections) → demoulding, oil hydraulic cylinder area and motor 6, hydraulic oil pump 7 required oil drain quantities in each action are calculated, and calculate required maximum stream flow according to its required maximal rate and the upper limit.
2,, then correspond respectively to each action and in ejaculator controller 11, set the frequency converter 5 output frequency upper limits (this upper limit must greater than the required minimum speed discharge-amount of hydraulic oil pump 7) according to required maximum stream flow difference.
Therefore anyway set in operating personnel's operation, promptly can cause because of the operation of different people is different to set value the too high energy waste that forms, can lower energy loss because of maximum upper limit is fixing not.
3, motor that low-limit frequency causes 6 rotating speeds of setting frequency converter 5 must not be lower than hydraulic oil pump 7 required minimum speeds in ejaculator controller 11, have a minimum flow this moment to satisfy the bare flow in the pipeline, reduce unstable in order to avoid flow velocity is crossed low build-up of pressure.
4, the upper and lower limit rotating speed of fluid,matching pressure oil pump 7 is limited in and is set restriction in the ejaculator controller 11, promptly when the setting flow is lower than the minimum speed of hydraulic oil pump 7 requirements, ejaculator controller 11 still makes frequency converter 5 assign the required minimum speed of the corresponding hydraulic oil pump of output frequency 7, and actual required flow is to make 4 controls of flow proportional control valve by ejaculator controller 11 in this moment course of action, thereby motor 6, hydraulic oil pump 7 are done at safety lowest speed restraint, and can prevent motor 6 and hydraulic oil pump 7 cause thermal damage excessively.
5, when Jet forming machine 1 required flow during greater than the safe minimum speed of hydraulic oil pump 7, ejaculator controller 11 makes the flow speed of Jet forming machine 1 by frequency converter 5 output control motor 6, hydraulic oil pump 7 required rotating speeds, and ejaculator controller 11 makes flow proportional control valve 4 standard-sized sheets at this moment.
6, represent by mathematical way, (frequency converter 5 is answered corresponding output frequency HZ=K * P * Q to power output, K is a parameter in the formula, P is a setting pressure, Q is for setting flow), and this maximum energy-saving frequency is relevant with load, also relevant with flow, again when Jet forming machine 1 required operating pressure is low, then can in the hydraulic oil pump 7 rotating speed upper limits, promote rotating speed and strengthen hydraulic oil pump 7 discharge-amounts by frequency converter 5, can improve the speed of carrying out and promote operating efficiency, and can avoid setting up operating condition merely on their own and build-up of pressure and flow all surpass capping and motor 6 motors are overloaded and damage by operating personnel.
Again because under most condition of molding, the required power of General System is all below 700～90kg, only the condition of molding under a few cases is just understood the bigger pressure of demand, therefore in ejaculator controller 11, increase a speed-raising ejection formation options button 111, select for use the seasonal system pressure upper limit to can be controlled in 80～100kg at this key, establishing ejaculator controller 11 this moment assigns instruction and makes frequency converter 5 promote 1.4～1.75 times of frequencies, flow and carry out speed and can promote 1.4～1.75 times then, to sizable benefiting be arranged to lifting of ejaculation shaping efficiency and the shortening of ejection formation cycle, and then can promote production efficiency and increase product quality (this design is that to be set at 140kg with system pressure be example, when the system pressure transformation period then can change).
7, shown in Fig. 1,3, owing to integrate control in the ejaculator controller 11 to frequency converter 5, thereby be unanimity in the adjustment of Jet forming machine 1 and frequency converter 5 action slopes, can not produce two kinds of nonsynchronous situations of slope, and can promote product efficiency and quality, and can be suitable for accurate ejection formation use.
8, owing to give frequency converter 5 one minimum restrictions of carrying out rotating speed, therefore under stable minimum flow, can not cause the system pressure instability.
Be with by the above, cause motor, hydraulic oil pump to damage because of operating personnel's improper operation when the present invention can avoid using frequency converter and disappearance such as system's instability, and can improve frequency converter frequency again under proper condition to promote prouctiveness.
Claims (3)
1, a kind of frequency-changing control system of Jet forming machine, it is characterized in that: mainly make the different injecting conditions and the process analysis procedure analysis of the ejaculator controller cooperation Jet forming machine of Jet forming machine, and controlled pressure valve, flow proportional control valve action, and this ejaculator controller can be controlled Jet forming machine and frequency converter action, and is connected with motor and hydraulic oil pump at frequency converter; This ejaculator controller is with the corresponding maximum output frequency of frequency converter and the upper limit flow set of different type of machines and corresponding each action demand again; The ejaculator controller is set the upper and lower limit rotating speed restriction of motor, hydraulic oil pump again, when required flow is lower than the minimum speed of hydraulic oil pump requirement, the ejaculator controller makes frequency converter output set lower frequency limit, control motor, hydraulic oil pump are in lower limit slow-speed of revolution action, and the ejaculator controller is controlled the required flow of flow proportional control valve control action process simultaneously again; And when required flow was higher than the minimum speed of hydraulic oil pump requirement, the course of action actual flow was by inverter control motor, hydraulic oil pump action; When required operating pressure is low, in the hydraulic oil pump rotating speed upper limit, make frequency converter promote frequency by the ejaculator controller, and control motor, hydraulic oil pump lifting rotating speed and increasing hydraulic oil pump discharge-amount.
2, the frequency-changing control system of Jet forming machine according to claim 1, it is characterized in that: described ejaculator controller is provided with speed-raising ejection formation options button, this speed-raising ejection formation options button selects for use the different demands in Shi Keyi action position to promote frequency converter frequency, and the responsiveness when promoting low pressure and reduce time action cycle.
3, the frequency-changing control system of Jet forming machine according to claim 1 is characterized in that: the control of described frequency converter is integrated with the ejaculator controller and is made the action slope of Jet forming machine, frequency converter consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100977126A CN100493882C (en) | 2004-11-24 | 2004-11-24 | Variable frequency control system of ejection forming machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100977126A CN100493882C (en) | 2004-11-24 | 2004-11-24 | Variable frequency control system of ejection forming machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1666855A true CN1666855A (en) | 2005-09-14 |
| CN100493882C CN100493882C (en) | 2009-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100977126A Expired - Fee Related CN100493882C (en) | 2004-11-24 | 2004-11-24 | Variable frequency control system of ejection forming machine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100422557C (en) * | 2006-04-04 | 2008-10-01 | 联塑(杭州)机械有限公司 | Control method for energy saving of hydraulic machinery or raising prodn. efficiency |
| CN102179912A (en) * | 2011-04-15 | 2011-09-14 | 联塑(杭州)机械有限公司 | Frequency-conversion energy-saving stable actuation improvement method and system of injection molding machine |
| CN102205612A (en) * | 2011-04-15 | 2011-10-05 | 联塑(杭州)机械有限公司 | Energy-saving improvement method for frequency conversion variable of injection moulding machine |
| CN101767424B (en) * | 2010-01-11 | 2013-01-16 | 苏州巨联科技有限公司 | Injection molding machine and injection molding method |
-
2004
- 2004-11-24 CN CNB2004100977126A patent/CN100493882C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100422557C (en) * | 2006-04-04 | 2008-10-01 | 联塑(杭州)机械有限公司 | Control method for energy saving of hydraulic machinery or raising prodn. efficiency |
| CN101767424B (en) * | 2010-01-11 | 2013-01-16 | 苏州巨联科技有限公司 | Injection molding machine and injection molding method |
| CN102179912A (en) * | 2011-04-15 | 2011-09-14 | 联塑(杭州)机械有限公司 | Frequency-conversion energy-saving stable actuation improvement method and system of injection molding machine |
| CN102205612A (en) * | 2011-04-15 | 2011-10-05 | 联塑(杭州)机械有限公司 | Energy-saving improvement method for frequency conversion variable of injection moulding machine |
| CN102179912B (en) * | 2011-04-15 | 2014-11-05 | 联塑(杭州)机械有限公司 | Frequency-conversion energy-saving stable actuation improvement method and system of injection molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100493882C (en) | 2009-06-03 |
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Granted publication date: 20090603 Termination date: 20151124 |