CN102179912B - Frequency-conversion energy-saving stable actuation improvement method and system of injection molding machine - Google Patents
Frequency-conversion energy-saving stable actuation improvement method and system of injection molding machine Download PDFInfo
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Abstract
The invention relates to a frequency-conversion energy-saving stable actuation improvement method and system of an injection molding machine. In order to adapt to a molding stage, the injection molding machine needs to change the pressure and the flow of a hydraulic system; the hydraulic system is provided with an electro-hydraulic servo valve; the electro-hydraulic servo valve is provided with an electromagnetic valve controlled by a controller of the injection molding machine and a guide valve guided by hydraulic oil; the guide pressure of the guide valve of the electro-hydraulic servo valve is more than the extra guide pressure of the minimum control pressure of the guide valve; the influences from pressure, flow change and impulse of the hydraulic system on the action of the electro-hydraulic servo valve can be furthest reduced; the hydraulic system is provided with a frequency converter, a motor and a variable pump; under the control of the controller of the injection molding machine, the time of output change of the frequency converter is earlier than that of a proportional valve of the variable pump; therefore, by means of the frequency-conversion energy-saving stable actuation improvement method and system, better action stability can be achieved, and quality of injection-molded products can be increased.
Description
Technical field
The present invention improves one's methods and system about a kind of ejaculator variable-frequency energy-saving stable action, mainly refers to a kind of method and system that promote energy-saving and frequency-variable action stability.
Background technology
Known ejaculator mainly provides locked mode by hydraulic system, the power of ejecting mechanism, with regard to the hydraulic system of ejaculator, main tool motor, hydraulic oil pump, various control valve, fluid pressure line, the assemblies such as fuel tank, and the motor of known ejaculator, hydraulic oil pump has many different building forms, the constant displacement pump combined system spuing for motor utilizing and single hop as the first, and this motor is constant speed (at a high speed) running, and constant displacement pump is fixed on maximum open, and the fixing discharge-amount of tool, thereby this system can maintain fixedly high flow capacity action, but ejaculator is in low-pressure, during the working stage of low discharge, unnecessary hydraulic pressure kinetic energy must be discharged, thereby the most obvious to energy waste.
The second is utmost point variable system more than general motor and heavy wool pump combine, and this motor is constant speed (at a high speed) running, and oil pump has a plurality of quantitative discharge openings, thereby can have a plurality of different discharge-amounts, and can make in response to flow, the pressure of ejaculator different operating stage demand suitable discharge opening action, although yet this system can be energy-conservation compared with first kind of way, because of the stage flow of the setting that only can spue, thereby still have the very large energy saving space.
The third is common electric machine and variable pump combined system, and this variable pump can be without the section different oil masses that spue, its energy-saving effect is good compared with the second way, but this motor still maintains fixed (at a high speed) running, can not coordinate discharge-amount adjustment, thereby motor energy loss and stability undesirable disappearance still while causing flow system flow low.
The 4th kind is servomotor and Constant Pump System, and the rotating speed of this servomotor can at will adjust, however constant displacement pump forever in maximum open, its discharge-amount is fixed as maximum discharge-amount, the unstable and not good situation of energy-saving effect of tool while causing servomotor low-speed running.
No. 259138, the 5th kind of Taiwan invention designing for inventor, No. 7281918th, U.S.'s invention, No. ZL200410097712.6 servo Frequency Converter Control motor of continent patent and variable pump systems, wherein servo frequency converter can be controlled motor speed, and the working stage that can coordinate ejaculator difference is adjusted motor speed and oil pump discharge-amount with tool energy-saving effect, this frequency converter can make motor speed promote to increase flow within the scope of the safety electric flow valuve of motor again, and can have a speedup effect, again inventor more to improve this oil pump be variable pump, and motor is by Frequency Converter Control combined system, make servo frequency converter can control motor speed, and variable pump can change discharge-amount with the better control energy-saving effect of tool, and can be suitable for producing thin-walled and accurate ejection formation product.
Thereby aforementioned the 5th kind of system is compared with one to four kind of better design, and ejaculator moulding is moved, because of the flow of different operating stage demand, pressure neither with, its flow required when high pressure is extremely low again, even need flow when cooling, therefore pressure, flow that motor, oil pump can be adjusted ejaculator hydraulic system with the different operating stage of ejaculator to be to reach energy-conservation and precise forming optimum efficiency, and on demand speedup to promote shaping efficiency.
Again in the hydraulic system of ejaculator in order to coordinate the hydraulic system pressure in ejaculator different operating stage, flow-control, this hydraulic system has can be by the electrohydraulic servo valve of the controller control of ejaculator, common person is as electro-hydraulic reversing valve, electro-hydraulic proportional valve, and take electro-hydraulic reversing valve as example, its configuration is as shown in Fig. 7～9, this Fig. 8 wherein, the hydraulic circuit of Fig. 9 adopts the general oil pressure mark of oil pressure skill to represent, and this electro-hydraulic reversing valve 1 ' tool magnetic valve 11 ', direction valve 12 ', pilot valve 13 ', and this pilot valve 13 ' is not enough to the big flow of fluid,matching pressure oil pump for the electromagnetic attraction in response to magnetic valve 11 ', pressure-operated and arranging, and can import hydraulic oil guiding so that magnetic valve 11 ' can operating stably by pilot valve 13 ', this hydraulic system system controls motor 3 ' rotating speed by frequency converter 2 ' again, and make variable pump 4 ' action spue pressure P to electro-hydraulic reversing valve 1 ', and export oil cylinder 5 ' to and make oil cylinder 5 ' action, this pressure P connects pilot valve 13 ' again, and make the magnetic valve 11 ' of electro-hydraulic reversing valve 1 ' assist commutation displacement and operating stably by pilot valve 13 ' guiding, pilot valve 13 ' the guide pressure P (hydraulic oil) of this electro-hydraulic reversing valve 1 ' can be by inner or outside introducing again, and the 8th figure be depicted as the hydraulic circuit by inside introducing, and the 9th shown in figure by the hydraulic circuit of outside introducing, and in two kinds of introducing modes, this pilot valve 13 ' is directly by the pressure P guiding of hydraulic system, to be moved.
Yet inventor does to find that the pressure, the flow that change hydraulic system cause the unstable situation of the larger pulsation of hydraulic system tool when energy-saving and frequency-variable is controlled in response to its working stage in working control ejaculator, for example ejaculator is 0 in hydraulic system pressure, the flow of cooling stage, and next hydraulic motor stirs the about 80kg/cm of pressure of material working stage
2, the about 60L/min of flow, but because of the about 12kg/cm of minimum guide pressure of aforementioned pilot valve 13 '
2, thereby hydraulic system 0 pressure, the flow of this cooling stage can not make pilot valve 13 ' action, must treat that the pressure of hydraulic system progressively rises to the guide pressure 12kg/cm that is greater than pilot valve 13 ' in a period of time
2time this electro-hydraulic reversing valve 1 ' could regular event, in this period, electrohydraulic servo valve is controlled required minimum pressure lower than electrohydraulic servo valve is stable because of the pressure of hydraulic system, flow, by being easy to, electrohydraulic servo valve is subject to pressure, the flow change of hydraulic system and the impact of pulsing, and be unfavorable for guaranteeing product quality particularly precision being penetrated to thin-wall product.
Again except the aforementioned reason that causes pulsation, this frequency converter 2 ', variable pump 4 ' is to assign instruction control action by the controller of ejaculator, and the working stage that can coordinate ejaculator makes frequency converter 2 ' output setpoint frequency adjust motor 3 ' rotating speed, and with (not the indicating in figure) that can be changed by the proportioning valve output of electromagnetism action generation in seasonal variable pump 4 ', adjust tool and set the bore that spues, and adjust the flow of hydraulic system, pressure, again this variable pump 4 ' do not export change to occur time no matter motor 3 ' rotating speed how soon, itself discharge-amount is very low, generally only lubricated for itself, and variable pump 4 ' output change occur time can by the proportioning valve of variable pump 4 ', be moved to adjust it and set discharge-amount.
Yet inventor finds that in the action of practical operation ejaculator energy-saving and frequency-variable this motor can not accurately coordinate with the action of variable pump, thereby still can cause the pressure of hydraulic system, it is unstable that when flow changes, this hydraulic system can produce pulsation, particularly motor by stop operating to a certain rotating speed because of confficient of static friction is large or rotating speed the utmost point in the short time by slow more obvious when having larger change soon, for example, when ejaculator its pressure under cooling condition, flow can be 0, and next action is that hydraulic motor stirs material, its flow may need to promote 60%, now frequency converter 2 ' need rise to 30HZ by 0HZ, and when frequency converter leaves circuit controls to motor, with respect to motor, frequency converter 2 ' itself almost can reach required requirement without any the delay of time by 0HZ to 30HZ, when but motor 3 ' will reach 600RPM by 0RPM, because motor 3 ' mechanical inertia energy storage, the inertia problem of inductive energy storage has regular hour delay, its time delay is generally at 0.1-0.2 about second, this causes the delay that reaches stable state action, this transient is easy to produce the unstability of moment and is unfavorable for system.Even if the loop circuit for frequency converter and motor is controlled, also the delay that reaches stable state action will be caused because of motor inertia.
Again when ejaculator is when pass mould is complete, its flow can be 0, and next action is to penetrate, its flow may need 50%, now frequency converter 2 ' is by the 0HZ 25HZ that need rise, when frequency converter leaves circuit controls to motor, with respect to motor, frequency converter 2 ' itself almost can reach required requirement without any the delay of time by 0HZ to 25HZ, when but motor 3 ' will reach 500RPM by 0RPM, because the time delay of motor inertia, generally at 0.1-0.15 about second, now can produce the delay of stable state action, even cause while penetrating action about moment unstability and then affect product quality, and the accurate product that penetrates of thin type is had more to crucial impact.Even if the loop circuit for frequency converter and motor is controlled, also the delay that reaches stable state action will be caused because of motor inertia.
Yet, ejaculator dealer does not find the unstable reason of aforementioned ejaculator energy-saving and frequency-variable action in fact at present, more how fear opinion solves improvement, thereby for promoting the accurate quality that penetrates product, how to have the unstable reality of pulsation energy-conservation and that can improve hydraulic system concurrently and has its necessity.
Summary of the invention
The present invention's object when the energy-conservation action of ejaculator frequency converter is provided the action of its hydraulic system can have better stability and an end product quality.
A kind of ejaculator variable-frequency energy-saving stable action is improved one's methods, wherein this ejaculator system is in response to pressure, the flow of shaping work phasic change ejaculator hydraulic system, and the pilot valve of the electrohydraulic servo valve of this hydraulic system is by the magnetic valve of the controller control of ejaculator and guided by hydraulic oil, it is characterized in that: provide the pilot valve of this electrohydraulic servo valve to be greater than the extra guide pressure of its minimum controlled pressure.
Further, wherein this extra guide pressure by being directly inputted to the pilot valve of electrohydraulic servo valve outside ejaculator hydraulic system.
Or wherein this extra guide pressure is via being incorporated into the pilot valve of electrohydraulic servo valve within ejaculator hydraulic system again.
Further, wherein this extra guide pressure is provided by pressure-retaining system, and this pressure-retaining system comprises motor, oil pump, pressure-control valve, fluid pressure line, and oil pump is provided by level pressure constant speed pressure, the flow that provides pilot valve to be greater than its minimum guide pressure.
Further, wherein pressure-retaining system is level pressure constant speed system.
Further, wherein this pressure-control valve can be located on oil pump, and electrohydraulic servo valve can be electro-hydraulic reversing valve again, and same level pressure constant speed system can provide the extra guide pressure of pilot valve of an above electrohydraulic servo valve again.
Further, wherein the frequency converter of this hydraulic system, variable pump action are controlled by the controller of ejaculator, and the controller of ejaculator sends instruction to frequency converter and variable pump, the generation that the generation that makes described frequency converter output change changes prior to variable pump output.
Further, after wherein variable pump output change betides the generation of frequency converter output change and the motor inertia prolongation process of motor speed change.
Further, the wherein proportioning valve of variable pump tool electromagnetism action, the again action of the controller control ratio valve of ejaculator output change generation.
Further, wherein the motor of Frequency Converter Control is servomotor.
The system that method of the present invention is used, wherein this ejaculator system is in response to pressure, the flow of shaping work phasic change ejaculator hydraulic system, and this hydraulic system tool electrohydraulic servo valve, and this electrohydraulic servo valve tool is by the magnetic valve of the controller control of ejaculator and by the pilot valve of hydraulic oil guiding, it is characterized in that: described pilot valve connects one provides it to be greater than the pressure-retaining system of the extra guide pressure of the minimum controlled pressure of pilot valve.
Further, described pressure-retaining system comprises motor, oil pump, pressure-control valve, fluid pressure line, and oil pump output is greater than the extra guide pressure of the minimum controlled pressure of pilot valve to the pilot valve of electrohydraulic servo valve.
Further, wherein this pressure-retaining system is level pressure constant speed system.
Further, wherein the oil pump of this pressure-retaining system by the outer guide pressure of the direct amount of imports in outside to pilot valve.
Or wherein the oil pump of this pressure-retaining system is inputted pilot valve again by inner amount of imports guide pressure to original hydraulic system.
The present invention's ejaculator system is in response to pressure, the flow of shaping work phasic change ejaculator hydraulic system, and the pilot valve of the electrohydraulic servo valve of this hydraulic system is by the magnetic valve of the controller control of ejaculator and guided by hydraulic oil; The invention provides again the extra guide pressure of pilot valve of this electrohydraulic servo valve, and maximum reduction electro-hydraulic servo valve events is subject to the impact of pressure, flow change and the pulsation of hydraulic system, thereby the present invention's electrohydraulic servo valve can still can accurately move by electrohydraulic servo valve when ejaculator energy-saving and frequency-variable action makes pressure, the flow of hydraulic system change, and can reduce hydraulic system and pulse to promote and make stability and penetrate product quality.
This extra guide pressure of the present invention is greater than the minimum controlled pressure of electrohydraulic servo valve, and draw by outside ejaculator hydraulic system or inside the pilot valve that output changes the hydraulic servo occurring, this extra guide pressure is provided by pressure-retaining system again, and this pressure-retaining system comprises motor, oil pump, pressure-control valve, fluid pressure line, and oil pump is provided by level pressure constant speed pressure, the flow that provides pilot valve to be greater than its minimum guide pressure.This pressure-retaining system can be level pressure constant speed system.
The present invention's ejaculator hydraulic system tool frequency converter, motor, variable pump, and the controller of ejaculator is controlled frequency converter, variable pump action, the generation that the generation that the controller of ejaculator makes described frequency converter output change again changes prior to variable pump output.After wherein variable pump output change can betide the generation of frequency converter output change and the motor inertia prolongation process of motor speed change.Preferably the motor of ejaculator this variable pump that can turn round when setting rotating speed can almost synchronously be exported and changes the action occurring, and can reduce the impact that the hydraulic system of motor action time difference generations is pulsed, further to promote ejaculation end product quality.When the direction operation increasing toward output is controlled, because motor drives lower load, therefore can reach relatively sooner rotating speed of target; When the direction operation reducing toward output is controlled, because motor drives higher load, therefore can reach relatively sooner rotating speed of target.
The system that the method for the invention is used, wherein this ejaculator system is in response to pressure, the flow of shaping work phasic change ejaculator hydraulic system, and this hydraulic system tool electrohydraulic servo valve, and this electrohydraulic servo valve tool is by the magnetic valve of the controller control of ejaculator and by the pilot valve of hydraulic oil guiding, pressure-retaining system mainly comprises motor, oil pump, pressure-control valve, fluid pressure line, and oil pump output is greater than the extra guide pressure of the minimum controlled pressure of pilot valve to the pilot valve of electrohydraulic servo valve; The generation that the generation that the controller of ejaculator makes described frequency converter output change again changes prior to variable pump output.After wherein variable pump output changes the motor inertia prolongation process that betides generation that frequency converter output changes and motor speed changes, preferably the motor of ejaculator this variable pump when setting rotating speed that can turn round can almost synchronously be exported the action that changes generation.
The oil pump of the present invention's pressure-retaining system by the outer guide pressure of the direct amount of imports in outside to pilot valve.Or the oil pump of the present invention's pressure-retaining system is inputted pilot valve again by inner amount of imports guide pressure to original hydraulic system.This pressure-retaining system is level pressure constant speed system.
Effect intentionally of the present invention: the pilot valve that (1) employing pressure-retaining system is electrohydraulic servo valve provides pressure to maintain can promote state, make the stable pressure of controlling of electrohydraulic servo valve can't help the pressure of hydraulic system, flow determines, and in an action pressure of hydraulic system, when flow rises, electrohydraulic servo valve can be rapidly by the controller control action of ejaculator, must not wait for that the boost in pressure of hydraulic system could move to the minimum guide pressure of electrohydraulic servo valve, can avoid this electrohydraulic servo valve because of the pressure of hydraulic system, flow is lower than the required minimum pressure of the stable control of electrohydraulic servo valve, the action causing is upper unstable with control time delay, thereby product quality is penetrated in lifting.
(2) motor of ejaculator this variable pump that can turn round when setting rotating speed can almost synchronously be exported and changes the action occurring, and the hydraulic system that can reduce generations of motor action time difference is pulsed, and can promote ejaculation product quality.And when the direction operation increasing toward output is controlled, because motor drives lower load, therefore can reach relatively sooner rotating speed of target; When the direction operation reducing toward output is controlled, because motor drives higher load, therefore can reach relatively sooner rotating speed of target.
Accompanying drawing explanation
Fig. 1 is that the present invention provides electro-hydraulic reversing valve extra guide pressure configuration diagram by outside.
Fig. 2 is that the present invention is provided the hydraulic circuit diagram of the extra guide pressure of electro-hydraulic reversing valve by outside.
Fig. 3 is that the present invention provides electro-hydraulic reversing valve extra guide pressure configuration diagram by inside.
Fig. 4 is that the present invention is provided the hydraulic circuit diagram of the extra guide pressure of electro-hydraulic reversing valve by inside.
Fig. 5 is that the controller of ejaculator of the present invention is controlled frequency converter, variable pump schematic diagram.
Fig. 6 is that the controller of ejaculator of the present invention is controlled frequency converter, variable pump action diagram represents intention.
Fig. 7 is known ejaculator hydraulic system part configuration diagram.
Fig. 8 is known ejaculator provides the hydraulic circuit diagram of the pilot valve pressure of electro-hydraulic reversing valve by the pressure of hydraulic system with inner guidance mode.
Fig. 9 is known ejaculator provides the hydraulic circuit diagram of the pilot valve pressure of electro-hydraulic reversing valve by the pressure of hydraulic system with outside guidance mode.
The specific embodiment
Embodiment mono-
Referring to Fig. 1, Fig. 2, a kind of ejaculator variable-frequency energy-saving stable action is improved one's methods, wherein this ejaculator system is in response to pressure, the flow of shaping work phasic change ejaculator hydraulic system, and the pilot valve 13 of the electrohydraulic servo valve 1 of this hydraulic system is by the magnetic valve of the controller control of ejaculator and guided by hydraulic oil, provide the pilot valve 13 of this electrohydraulic servo valve 1 to be greater than the extra guide pressure of its minimum controlled pressure.
Wherein this extra guide pressure is by the pilot valve 13 that is directly inputted to electrohydraulic servo valve 1 outside ejaculator hydraulic system.
Wherein this extra guide pressure is provided by pressure-retaining system 6, and this pressure-retaining system 6 comprises motor 61, oil pump 62, pressure-control valve 63, fluid pressure line 64, and oil pump 63 is provided by level pressure constant speed pressure, the flow that provides pilot valve 13 to be greater than its minimum guide pressure.
Wherein pressure-retaining system 6 is level pressure constant speed systems.
Wherein this pressure-control valve 63 can be located on oil pump 62, and electrohydraulic servo valve 1 can be electro-hydraulic reversing valve again, and same level pressure constant speed system can provide the extra guide pressure of pilot valve 13 of an above electrohydraulic servo valve 1 again.
Wherein the frequency converter 2 of this hydraulic system, variable pump 4 actions are controlled by the controller 7 of ejaculator, the controller 7 of ejaculator sends instruction to frequency converter 2 and variable pump 4, the generation that the generation that makes described frequency converter 2 outputs change changes prior to variable pump 4 outputs, is shown in Fig. 5, Fig. 6.
After wherein variable pump 4 output changes betide frequency converter 2 generations of output change and the motor inertia prolongation process of motor 3 rotating speed changes.
The wherein proportioning valve 41 of variable pump 4 tool electromagnetism actions, the again action of the controller 7 control ratio valve 41 output change generations of ejaculator.
The motor 3 that wherein frequency converter 2 is controlled is servomotors.
The present invention can promote state because the pilot valve 13 of electrohydraulic servo valve 1 provides pressure P 1 to maintain by pressure-retaining system 6.Thereby for example ejaculator may be 0 pressure, 0 flow or utmost point low-pressure, utmost point low discharge in pressure, the flow of its hydraulic system of cooling stage, and in the hydraulic system of traditional ejaculator, when the stable control of the pressure of hydraulic system, the flow electrohydraulic servo valve in lower than hydraulic system takes, by being easy to, electrohydraulic servo valve is subject to pressure, the flow change of hydraulic system and the impact of pulsing, and be unfavorable for guaranteeing product quality particularly precision being penetrated to thin-wall product.And pressure-retaining system 6 of the present invention provides the extra guide pressure of pilot valve 13 of this electrohydraulic servo valve 1, extra guide pressure is provided to electrohydraulic servo valve 1 action, pressure, the flow that can remove as far as possible when hydraulic system take lower than the stable control of electrohydraulic servo valve 1, the pressure of hydraulic system, flow change and the adverse effect of pulsation to the stable control of electrohydraulic servo valve 1.
In conventional hydraulic, stable to control required pressure be that pressure, flow by hydraulic system determines to the pilot valve of electrohydraulic servo valve, and electro-hydraulic servo valve events is when switch, the required minimum pressure of the stable control of pilot valve of electrohydraulic servo valve often can not be provided when the low-pressure of hydraulic system, low discharge, make electrohydraulic servo valve be subject to the impact of pressure, flow change and the pulsation of hydraulic system, and be unfavorable for guaranteeing product quality.And pressure-retaining system of the present invention provides the extra guide pressure of pilot valve 13 of this electrohydraulic servo valve 1, described extra guide pressure is the required minimum pressure of the stable control of pilot valve that is greater than electrohydraulic servo valve, therefore can the pilot valve 13 of electrohydraulic servo valve 1 is stable controls required pressure and reach fast the pressure, the flow that are not by hydraulic system and determine, 1 action produces as far as possible little impact on electrohydraulic servo valve for the pressure of hydraulic system, flow change and pulsation thus.
In some cases, from cooling stage start to enter next motor stir the pressure of its hydraulic system of material working stage may be by 0 pressure, 0 flow or utmost point low-pressure, utmost point low discharge is brought up to a certain sufficiently high pressure at once, during flow value, the present invention is owing to providing extra pressure-retaining system, this electrohydraulic servo valve 1 can be rapidly by the controller control action of ejaculator, must not wait for that the boost in pressure of hydraulic system could move to the minimum guide pressure of electrohydraulic servo valve 1, can avoid traditionally the pressure because of hydraulic system, flow is lower than the required minimum pressure of the stable control of pilot valve of electrohydraulic servo valve, cause the delay of electro-hydraulic servo valve events traditionally and on this period of time delay electrohydraulic servo valve control unstable, thereby product quality is penetrated in lifting.
Again for example ejaculator in ejaculation process, in general controller, have penetrate three sections of four sections and pressurizes totally seven sections can be for adjusting, we suppose that the condition of molding in its each stage is: penetrate 60 kilograms of first paragraph firing rate 30% pressure, 60 kilograms of second segment firing rate 80% pressure, 50 kilograms of the 3rd section of firing rate 40% pressure, the 4th section of firing rate do not used, 30 kilograms of 50 kilograms of pressurize second segment speed 15% pressure of pressurize first paragraph speed 30% pressure, the 3rd section of pressurize do not used, now when first paragraph firing rate changes into second segment firing rate Time Controller motor inverter is first assigned instruction and made motor speed first rise to the required rotating speed of convergence and then variable pump is assigned to instruction, at second segment firing rate, change into the 3rd section of firing rate Time Controller and motor inverter and variable pump are assigned to instruction simultaneously, after the 3rd section of firing rate changes into pressurize first paragraph, change into again pressurize second segment Time Controller and still motor inverter and variable pump are assigned to instruction simultaneously.Although hydraulic system can offer pilot valve 13 its required pressure of electrohydraulic servo valve 1 in this process, but because the required pressure of the pilot valve 13 of electrohydraulic servo valve 1 is by direct input pilot valve outside ejaculator hydraulic system, so pressure-retaining system still provides the pilot valve of electrohydraulic servo valve required guide pressure.
For example ejaculator is 0 in the hydraulic system pressure, the flow that close the complete working stage of mould again, and next pressure, flow of penetrating working stage must significantly promote, and the aforementioned control of the present invention can prevent that the hydraulic system pulsation being caused to boosting by utmost point low pressure is unstable, electro-hydraulic reversing valve be take as example in the present invention system again, and above-mentioned example illustrates that also applicable the present invention is at the status of using of other electrohydraulic servo valve.
The time of origin that the controller 7 of ejaculator makes the output of frequency converter 2 change is t
1, and the time of origin that proportioning valve 41 outputs of the controller 7 control variables pumps 4 of ejaculator change is t
2, and t
2>=t
1+ t
3, t wherein
3for the mechanical inertia of motor 3, the coasting time delay of inductance inertia energy storage, and this time delay t
3system and motor type, characteristic, setting rotating speed are relevant, and for example the habitual response of general motor is slower, its time delay t
3longer, approximately 0.2 second following (0.1～0.2 second), again the habitual response time of servomotor very fast, its time delay t
3shorter, approximately 0.1 second following (0.05～0.1 second), but this time delay t
3the reaction time changing much larger than the output of frequency converter 2, proportioning valve 41, again this time delay t
3relevant with the setting rotating speed of motor 3, it is long that the time that for example motor rises to 1000RPM by 0RPM rises to the 500RPM time by 0RPM, thereby the controller 7 of ejaculator is pressure, flow correspondence motor 3 kinds, characteristic, speed setting t time delay according to ejaculator working stage demand hydraulic system
3, and motor 3 running is reached while setting rotating speed, make again proportioning valve 41 outputs of variable pump 4 change the action occurring.
The action of dependent variable pump has changed the rotating speed that needs the time to be generally all less than motor and has changed and need the time, therefore if frequency converter output changes while being required with variable pump output change traditionally approximately simultaneously, often the output of variable pump change completes, and the change of the rotating speed of motor not yet completes, while controlling for the direction operation increasing toward output, the output of the unstable state rotating speed of motor will be easy to be passed in system oil-way by variable pump.But the generation that the generation that the present invention changes because of frequency converter 2 outputs changes prior to variable pump 4 outputs, makes variable pump provide system motor to a certain degree to export astable isolation.And, because motor drives lower load, therefore can reach relatively sooner rotating speed of target, relatively reduce the astable time.
Thereby the present invention can prevent that the proportioning valve 41 of dependent variable pump 4 from having moved but motor 3 does not reach yet when rotating speed is set and causes pulsation unstable, and can promote ejaculation end product quality.
The working stage of ejaculator of take is example, when ejaculator in cooling work during the stage its pressure, flow be 0, and next motor stirs material working stage its motor 3 and must turn round to 720RPM, thereby the controller 7 of ejaculator can make frequency converter 2 in t before next motor stir material working stage
1time action, and through one section time delay t
3rear t
2time chien shih motor 3 make again proportioning valve 41 actions of variable pump 4 while having turned round to 720RPM, thereby motor 3 has reached setting rotating speed during this variable pump 4 action, and can avoid motor 3 inertial delaies to cause pulsation unstable, and can promote ejaculation end product quality.
Above-mentionedly illustrate also applicable the present invention at other status of using, for example, when motor speed rises to the demand generation of 1000RPM by 300RPM, if frequency converter output changes while being required with variable pump output change approximately simultaneously, the unstable state rotating speed output of motor will be easy to be passed in system oil-way by variable pump.But the generation that the generation that the present invention changes because of frequency converter 2 outputs changes prior to variable pump 4 outputs, makes variable pump provide system motor to a certain degree to export astable isolation.Wherein, because motor drives lower load, therefore can reach relatively sooner rotating speed of target, relatively reduce the astable time.And, in the present invention, when the direction operation reducing toward motor speed is controlled, although frequency converter output changes can be by requirement simultaneously with variable pump output change, but the generation that the generation that 2 outputs change for frequency converter changes prior to variable pump 4 outputs, still has the relative reduction advantage of its unstable state time.
In addition, although in the illustration before the present invention, motor speed rises to 1000RPM by 0RPM, rises to 500RPM with motor speed by 0RPM, can set different time delay.But sometimes comparatively easy in order to make to control setting, motor speed rises to 1000RPM by 0RPM, by 0RPM, rise to 500RPM with motor speed, in the situation that select suitable intermediate value time delay, even if set identical time delay, the generation that the generation changing due to frequency converter 2 output changes prior to variable pump 4 outputs, makes the time delay of setting sometimes may be slightly not enough, or a little surpasses and needs.Wherein, when the time delay of setting, a little surpasses while needing, and is inappreciable, therefore except relatively slightly extending whole cycle time, have in fact hardly other any adverse effect because comparing with the whole cycle period of producing product time delay.In addition, when the time delay of setting is slightly not enough, the generation that the generation changing because of frequency converter 2 outputs changes prior to variable pump 4 outputs, the variable pump that makes to start more slowly action still can provide system buffer compartment to a certain degree from.Time delay of shorter setting for example, make the time advance of the generation of variable pump 4 output changes, and the time that time that variable pump 4 output changed and motor is exported changed is the while approximately, and variable pump 4 still provides system motor to a certain degree to export astable isolation.These situations, are still one of illustration miscellaneous of the present invention, and compare with tradition, still possess advantage to a certain degree provided by the invention.
Embodiment bis-
Referring to Fig. 3, Fig. 4, the difference of the present embodiment and embodiment mono-is that wherein this extra guide pressure is via the pilot valve 13 that is incorporated into again electrohydraulic servo valve 1 within ejaculator hydraulic system.Because the extra guide pressure of the pilot valve 13 of electrohydraulic servo valve 1 is introduced through hydraulic system is inner, in ejaculator ejaculation process, because system works pressure in each stage ejaculation process is all greater than the required guide pressure of pilot valve 13 of electrohydraulic servo valve 1, so pressure-retaining system 6 is inoperative.From cooling stage, start to enter next motor and stir the pressure of its hydraulic system of material working stage may be for 0 pressure, 0 flow or a certain utmost point low-pressure, the utmost point low discharge value time, pressure-retaining system 6 works.All the other 26S Proteasome Structure and Functions are all identical with embodiment mono-.
Embodiment tri-
Referring to Fig. 1, Fig. 2, a kind of ejaculator variable-frequency energy-saving stable action improved system, wherein this ejaculator system is in response to pressure, the flow of shaping work phasic change ejaculator hydraulic system, and this hydraulic system tool electrohydraulic servo valve 1, and this electrohydraulic servo valve 1 tool is by the magnetic valve of the controller control of ejaculator and by the pilot valve 13 of hydraulic oil guiding, described pilot valve 13 connects one provides it to be greater than the pressure-retaining system 6 of the extra guide pressure of the minimum controlled pressure of pilot valve 13.
Described pressure-retaining system comprises motor 61, oil pump 62, pressure-control valve 63, fluid pressure line 64, and oil pump 62 outputs are greater than the extra guide pressure of the minimum controlled pressure of pilot valve 13 to the pilot valve 13 of electrohydraulic servo valve 1.
Wherein this pressure-retaining system 6 is level pressure constant speed systems.
Wherein the oil pump 62 of this pressure-retaining system 6 by the outer guide pressure of the direct amount of imports in outside to pilot valve 13.
The present invention can promote state because the pilot valve 13 of electro-hydraulic reversing valve 1 provides pressure P 1 to maintain by pressure-retaining system 6, thereby for example ejaculator in the pressure of its hydraulic system of cooling stage, flow is 0 o'clock, and enter pressure that next motor stirs material working stage its hydraulic system must fast lifting to about 80kg/cm2, during the about 60L/min of flow this electro-hydraulic reversing valve 1 can be rapidly by the controller control action of ejaculator, must not wait for that the boost in pressure of hydraulic system could move to the minimum guide pressure of electro-hydraulic reversing valve 1, can avoid the action of this electro-hydraulic reversing valve 1 to cause pulsation unstable time delay, and can promote ejaculation product quality, again for example ejaculator in the hydraulic system pressure that closes the complete working stage of mould, flow is 0, and next penetrates the pressure of working stage, flow must significantly promote, and the aforementioned control of the present invention can prevent that the hydraulic system pulsation being caused to boosting by utmost point low pressure is unstable.
Embodiment tetra-
Referring to Fig. 3, Fig. 4, the difference of the present embodiment and embodiment tri-is that wherein the oil pump 62 of this pressure-retaining system 6 is inputted pilot valve 13 again by inner amount of imports guide pressure to original hydraulic system.All the other 26S Proteasome Structure and Functions are identical with embodiment tri-.
Therefore by aforementioned, the present invention can promote ejaculator enhancing action stability when energy-saving and frequency-variable moves, and make the ejaculator can production control high quality of products, although the present invention increases level pressure constant speed system again, but this level pressure constant speed system need only provide the low-pressure that can make pilot valve promotion completely, its power consumption is minimum, it is unstable and can produce the accurate high quality of products that penetrates and should belong to remarkable enhancement effect design that contrast the present invention can improve hydraulic system pulsation, if the present invention only provides extra guide pressure to electrohydraulic servo valve control but not for frequency converter again, when controlling according to the inventive method, variable pump also can there is the better action stability of more known ejaculator, and example of the present invention system illustrates the present invention as illustration, and the present invention is not changed the restriction of example, in this is open, only describe the present invention and partly move illustration, all this area persons revise the category that also should belong to the contained lid of the present patent application the scope of the claims for it according to the present invention's spirit.
Claims (14)
1. ejaculator variable-frequency energy-saving stable start is improved one's methods, wherein this ejaculator is according to the pressure of shaping work phasic change ejaculator hydraulic system, flow, and magnetic valve and hydraulic oil that the pilot valve of the electrohydraulic servo valve of this hydraulic system is controlled by the controller of ejaculator guide, it is characterized in that: provide the pilot valve of this electrohydraulic servo valve to be greater than the extra guide pressure of its minimum controlled pressure, wherein this extra guide pressure is provided by pressure-retaining system, this pressure-retaining system comprises motor, oil pump, pressure-control valve, fluid pressure line, and oil pump output provides pilot valve to be greater than its minimum controlled pressure.
2. a kind of ejaculator variable-frequency energy-saving stable as claimed in claim 1 start is improved one's methods, and it is characterized in that: wherein this extra guide pressure is directly inputted to the pilot valve of electrohydraulic servo valve by the outside of ejaculator hydraulic system.
3. a kind of ejaculator variable-frequency energy-saving stable as claimed in claim 1 start is improved one's methods, and it is characterized in that: wherein this extra guide pressure is incorporated into the pilot valve of electrohydraulic servo valve again via the inside of ejaculator hydraulic system.
4. the start of a kind of ejaculator variable-frequency energy-saving stable is improved one's methods as claimed in claim 2 or claim 3, it is characterized in that: described pressure-retaining system is level pressure constant speed system.
5. a kind of ejaculator variable-frequency energy-saving stable as claimed in claim 4 start is improved one's methods, it is characterized in that: wherein this pressure-control valve is located on oil pump, electrohydraulic servo valve is electro-hydraulic reversing valve again, and same level pressure constant speed system provides the extra guide pressure of pilot valve of an above electrohydraulic servo valve again.
6. a kind of ejaculator variable-frequency energy-saving stable start as described in claim 1～3 any one is improved one's methods, wherein the frequency converter of this hydraulic system, variable pump action are controlled by the controller of ejaculator, it is characterized in that: the controller of ejaculator sends instruction to frequency converter and variable pump the generation that the generation that makes described frequency converter output change changes prior to variable pump output.
7. a kind of ejaculator variable-frequency energy-saving stable as claimed in claim 6 start is improved one's methods, and it is characterized in that: wherein variable pump output change betide motor inertia that the motor speed of generation that frequency converter output changes and hydraulic system changes extend process after.
8. a kind of ejaculator variable-frequency energy-saving stable as claimed in claim 7 start is improved one's methods, and it is characterized in that: the wherein proportioning valve of variable pump tool electromagnetic activation, the again action of the controller control ratio valve of ejaculator output change generation.
9. a kind of ejaculator variable-frequency energy-saving stable as claimed in claim 8 start is improved one's methods, and it is characterized in that: wherein the motor of the hydraulic system of Frequency Converter Control is servomotor.
10. the system that a kind of ejaculator variable-frequency energy-saving stable as claimed in claim 1 start is improved one's methods, wherein this ejaculator is according to pressure, the flow of shaping work phasic change ejaculator hydraulic system, and this hydraulic system tool electrohydraulic servo valve, and this electrohydraulic servo valve tool is by the magnetic valve of the controller control of ejaculator and the pilot valve being guided by hydraulic oil, it is characterized in that: described pilot valve connects one provides it to be greater than the pressure-retaining system of the extra guide pressure of the minimum controlled pressure of pilot valve.
11. systems as claimed in claim 10, is characterized in that: described pressure-retaining system comprises motor, oil pump, pressure-control valve, fluid pressure line, and oil pump output is greater than the extra guide pressure of the minimum controlled pressure of pilot valve to the pilot valve of electrohydraulic servo valve.
12. systems as described in claim 10 or 11, is characterized in that: wherein this pressure-retaining system is level pressure constant speed system.
13. systems as claimed in claim 12, is characterized in that: wherein the oil pump of this pressure-retaining system by the outer guide pressure of the direct amount of imports in outside to pilot valve.
14. systems as claimed in claim 12, is characterized in that: wherein the oil pump of this pressure-retaining system is inputted pilot valve again by outer guide pressure to the inside of ejaculator hydraulic system of the inner amount of imports.
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| CN102336029A (en) * | 2011-10-13 | 2012-02-01 | 湖州机床厂有限公司 | Servo control system for hydraulic machine |
| CN115489213B (en) * | 2022-11-21 | 2023-03-24 | 季华实验室 | OLED (organic light emitting diode) jet printing ink path flow control method and system |
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| JP3895511B2 (en) * | 1999-11-10 | 2007-03-22 | 住友重機械工業株式会社 | Molding device for injection molding machine |
| CN202097922U (en) * | 2011-04-15 | 2012-01-04 | 联塑(杭州)机械有限公司 | Variable-frequency energy-saving stable actuating improvement system for injection molding machine |
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