CN102848540B - Servo control system and method - Google Patents
Servo control system and method Download PDFInfo
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- CN102848540B CN102848540B CN201210277122.6A CN201210277122A CN102848540B CN 102848540 B CN102848540 B CN 102848540B CN 201210277122 A CN201210277122 A CN 201210277122A CN 102848540 B CN102848540 B CN 102848540B
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Abstract
The invention discloses a servo control system and method. The servo control system comprises a power device and a hydraulic device, and further comprises a low end pump with high internal leakage, a mode selection module, a controller, a pressure control device and a pressure sensor, wherein when the pressure of the output end of the low end pump is not lower than a preset pressure, the controller controls the rotating speed of the low end pump to fall within a preset rotating speed scope; and when the pressure of the output end of the low end pump is lower than the preset pressure, the controller controls the rotating speed of the low end pump to be improved according to the pressure of the output end of the low end pump, i.e., in the whole pressure maintenance stage, the low end pump is always in an operating state; at the moment, external oil for lubricating the low end pump keeps flowing into the low end pump, and the pump is lubricated and cooled, so that the wearing of mechanical parts is greatly reduced, and the problem of pump loss is solved.
Description
Technical field
The application relates to plastics machinery control system field, in particular, relates to a kind of servo-control system and method.
Background technology
PMMA(PolymethylMethacrylate, polymethyl methacrylate) also known as making acrylic (ACRYLIC) or lucite, have light weight, inexpensive, be easy to the advantage such as shaping, be widely used in the every field such as instrument and meter part, automobile lamp, optical mirror slip, transparent pipeline.Due to the product that acrylic material is made, not only style is exquisite, durable in use, and has environmental-protection function, and its usage degree has occupied more than 70% of whole international market, shows stronger competitiveness.
Along with the development of technology and the extensive use of engineering plastics, the former of plastics requires more and more, the injection machine manufacturer of industrially developed country is all in the ability to provide the auxiliary items improving constantly the function of common injection machine, quality, auxiliary equipment in the world, and automatization level, Devoting Major Efforts To Developing, development large size plastic jetting-moulding device, special injection molding, reaction injection molding(RIM) machine and precise injection machine simultaneously, with the demand of the plastic products of satisfied production plastic alloy, magnetic plastics, band inserts.
The injection machine of existing market is commonly the injection machine of servo-control system, and it adopts closed-loop control system to carry out operation and controls, and the pressure of gear pump output can be made to meet pressure required in packing stage.But, in the injection machine of servo-control system packing stage in the pressure mode, the hydraulic energy that gear pump is supplied to oil cylinder meets hydraulic energy needed for oil cylinder, gear pump rotates hardly, now extraneously the oil of lubrication is provided no longer to flow to gear pump for gear pump, lubricant effect in gear pump reduces, and causes the degree of wear of gear pump to increase.
Summary of the invention
For the problems referred to above, the application provides a kind of servo-control system and method, has solved the problem that existing injection machine increases in the degree of wear of packing stage middle gear pump.Technical scheme is as follows:
Based on the one side of the application, provide a kind of servo-control system, be applied in injection machine, comprise: power set and hydraulic means, also comprise: inside let out high low side pump, mode selection module, controller, pressure control device and pressure sensor, wherein,
Described low side pump is connected between described power set and described hydraulic means, and the changes mechanical energy for being produced by described power set is hydraulic energy, and described hydraulic energy is supplied to described hydraulic means;
Described mode selection module, is connected with described controller, and for selecting the mode of operation that each working stage is corresponding, the mode of operation that wherein packing stage is corresponding is velocity mode;
Described pressure sensor, for gathering the pressure of described low side pump output terminal, and sends to described controller by described pressure;
Described controller, with described power set, described mode selection module and described pressure sensor are connected, for according to described working stage, the pressure of described mode of operation and described low side pump output terminal, control described power set and described pressure control device, wherein, be packing stage at described working stage, when described mode of operation is velocity mode, when the pressure of described low side pump output terminal is less than preset pressure, described controller is according to the pressure of described low side pump output terminal, control the rotating speed that described power set improve low side pump, when the pressure of described low side pump output terminal is not less than preset pressure, described controller controls pressure control device in described servo-control system, and control described power set the rotating speed of described low side pump is maintained within the scope of preset rotation speed,
Described pressure control device connects with described controller, for regulating the pressure of described low side pump output terminal under described controller control.
Preferably, described low side pump is screw pump.
Preferably, described mode selection module comprises:
Setup unit, for setting preset pressure needed for mode of operation corresponding to each stage and described mode of operation and preset rotation speed;
Selection unit, selects the mode of operation corresponding with described working stage for the working stage according to current injection machine.
Preferably, described controller comprises:
Acquiring unit, for being packing stage at described working stage, and when described mode of operation is velocity mode, obtains the pressure of current described low side pump output terminal;
Judging unit, for judging whether the pressure of described low side pump output terminal is less than preset pressure;
Computing unit, for judging that the pressure of described low side pump output terminal is less than preset pressure at described judging unit, calculate the described pressure of servo-control system low and middle-end pump output terminal and the difference of preset pressure, and draw the tachometer value of described low side pump according to described mathematic interpolation;
First control unit, for controlling the rotating speed that described power set improve described low side pump according to described tachometer value;
Second control unit, for judging that the pressure of described low side pump output terminal is not less than preset pressure at described judging unit, control pressure control device in described servo-control system, and control described power set the rotating speed of described low side pump is maintained within the scope of preset rotation speed.
Preferably, described pressure control device is proportional pressure control valve.
Based on the another aspect of the application, a kind of pressurize method of servo-control system is also provided, is applied in servo-control system as above, comprises:
Select the current working phase of described injection machine and mode of operation corresponding to described current working phase;
Be packing stage at described current working phase, and when described mode of operation is velocity mode, obtain the pressure of described servo-control system low and middle-end pump output terminal;
Judge whether the pressure of described servo-control system low and middle-end pump output terminal is less than preset pressure;
When the pressure of described low side pump output terminal is less than described preset pressure, according to the pressure of described low side pump output terminal, the power set controlled in described servo-control system improve the rotating speed of low side pump;
When the pressure of described low side pump output terminal is not less than preset pressure, control pressure control device in described servo-control system, and control described power set the rotating speed of described low side pump is maintained within the scope of preset rotation speed.
Preferably, the current working phase of the described injection machine of described selection and mode of operation corresponding to described current working phase comprise:
Set mode of operation corresponding to each stage and the preset pressure needed for described mode of operation and preset rotation speed;
Working stage according to current injection machine selects the mode of operation corresponding with described working stage.
Preferably, according to the pressure of described low side pump output terminal, the rotating speed raising controlling described servo-control system low and middle-end pump comprises:
Difference between the pressure calculating described preset pressure and described low side pump output terminal;
The tachometer value of described low side pump is drawn according to described mathematic interpolation;
The rotating speed that described power set improve described low side pump is controlled according to described tachometer value.
Application technique scheme, the application lets out high low side pump in being changed into by the gear pump in injection machine system, by the mode of letting out in increasing, oil temperature in low side pump is reduced fast, reduces high oil temperature to the wearing and tearing of the mechanical part in low side pump.Simultaneously in the packing stage of velocity mode, when the pressure of low side pump output terminal is not less than preset pressure, controller controls the rotating speed of low side pump within the scope of preset rotation speed; When the pressure of low side pump output terminal is less than preset pressure, controller is according to the pressure of low side pump output terminal, and the rotating speed controlling low side pump improves.That is at whole packing stage, low side pump is in running status always, now extraneously provides the oil of lubrication to flow to low side pump for low side pump always, and pump obtains lubrication and cooling, thus greatly reduces the wearing and tearing of mechanical part, thus solves pump loss problem.
Further, the application controls power set in real time by the size of the pressure and preset pressure that judge servo-control system low and middle-end pump output terminal and pressure control device maintains within the scope of preset rotation speed to regulate low side revolution speed, namely semi-loop and full closed loop control mode is adopted at packing stage, under ensureing that servo-control system realizes the object of long-time pressurize, also achieve energy-conservation object simultaneously.
In addition, the mode selection module of the servo-control system that the application provides can be arranged on its exterior, the convenient change to servo-drive system pressurize pattern and selection, the pattern of producing needed for different process product is made to carry out any switching laws, the system that avoids is produced different process product and needs again parameter-embedded step, be convenient to Dynamic System, save human resources.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present application, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of structure chart of a kind of servo-control system that Fig. 1 provides for the application;
The structure chart of the power set of a kind of servo-control system that Fig. 2 provides for the application;
The structure chart of the mode selection module of a kind of servo-control system that Fig. 3 provides for the application;
The structure chart of the controller of a kind of servo-control system that Fig. 4 provides for the application;
A kind of flow chart of the pressurize method of a kind of servo-control system that Fig. 5 provides for the application;
A kind of sub-process figure of the pressurize method of a kind of servo-control system that Fig. 6 provides for the application;
The another kind of sub-process figure of the pressurize method of a kind of servo-control system that Fig. 7 provides for the application.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
An embodiment
Refer to Fig. 1, it illustrates the structure chart of a kind of servo-control system that the application provides, comprising: power set 2 and hydraulic means 4, also comprise: inside let out high low side pump 3, mode selection module 5, controller 1, pressure control device 6 and pressure sensor 7, wherein
Low side pump 3 is connected between power set 2 and hydraulic means 4, and the changes mechanical energy for being produced by power set 2 is hydraulic energy, and hydraulic energy is supplied to hydraulic means 4.
In the present embodiment, servo-control system lets out high low side pump 3 in selecting, and by the mode of letting out in increasing, oil temperature in low side pump 3 is reduced fast, avoids low side pump 3 be in long term overloading state at packing stage and burn out pump.Especially, in the present embodiment, inside let out high low side pump 3 and be preferably screw pump.
Wherein, the running of low side pump 3 is runnings under power set 2 drive, refer to Fig. 2, it illustrates the structure chart of the power set of a kind of servo-control system that the application provides, comprise: driver 21, motor 22 and encoder 23, wherein, motor 22 connects with low side pump 3, low side pump 3 is driven to rotate by the rotation of motor 22, driver 21 connects with controller 1, the tachometer value sent by obtaining controller 1 controls motor running, encoder 23 detects the rotating speed of motor 22 in real time, when encoder 23 detects that the offspeed controller 1 of motor 22 sends to the tachometer value of driver 21, encoder 23 gathers the current rotating speed of motor 22, and send current for motor 22 rotating speed to driver 21, motor 22 current rotating speed control and regulation motor 22 rotating speed that driver 21 sends according to encoder 23, motor 22 rotating speed is made again to maintain the tachometer value that controller 1 sends to driver 21.
Mode selection module 5, for selecting the mode of operation that each working stage is corresponding, the mode of operation that wherein packing stage is corresponding is velocity mode.
The product of variety classes, different qualities produced by injection machine, and they are different in the dwell time that packing stage needs.As produced the thicker acrylic product of a kind of wall thickness, in a whole production process, time needed for packing stage occupies about 80% of the overall process production time, and produce the thinner product of a kind of wall thickness, the dwell time that packing stage occupies only occupies the very little part of overall process production time, therefore, for the product producing variety classes, different qualities, different mode of operations to be selected according to the working stage of current injection machine.
In the present embodiment, for the product producing the long-time pressurize of the thicker needs of wall thickness, when whole technological process enters packing stage, the mode of operation that mode selection module 5 selects packing stage corresponding is velocity mode.
Refer to Fig. 3, it illustrates the structure chart of the mode selection module of a kind of servo-control system that the application provides, comprising: setup unit 51 and selection unit 52, wherein,
Setup unit 51 is for setting preset pressure needed for mode of operation corresponding to each stage and mode of operation and preset rotation speed.Selection unit 52 selects the mode of operation corresponding with working stage for the working stage according to current injection machine.
Be described with a complete technological process below, the whole technological process process that such as servo-control system manufactures a finished product can comprise: close mode step section, injection stage, packing stage, storing stage, penetrate the stage of moving back, cooling stage, die sinking stage and ejection phase, produce variety classes, different qualities product time, each working stage of servo-control system all needs the mode of operation different according to the different set of product needed, and the preset pressure needed for mode of operation.In the present embodiment, before injection machine enters packing stage, setup unit 51 presets packing stage to having pressure pattern and velocity mode two kinds of mode of operations, and preset pressure required under pressurize pattern and velocity mode.When injection machine enters packing stage, selection unit 52 selects injection machine packing stage to select velocity mode.
In addition, mode selection module 5 can be arranged in the inside of servo-control system, also can be arranged in the outside of servo-control system.Mode selection module 5 can be arranged in the outside of servo-control system by the application, can realize the setting to the preset pressure needed for mode of operation corresponding to each stage and mode of operation by manual operation.
Pressure for gathering the pressure of low side pump 3 output, and is sent to controller 1 by pressure sensor 7.Especially, the pressure of pressure sensor 7 moment monitoring low side pump 3 output, and the pressure of low side pump 3 output collected is sent to controller 1.
Controller 1 and power set 2, mode selection module 5 and pressure sensor 7 are connected, the working stage selected for foundation mode selection module 5 and mode of operation, receive the pressure of low side pump 3 output that pressure sensor 7 sends, control power set 2 and pressure control device 6.
Pressure control device 6 connects with controller 1, for regulating the pressure of low side pump 3 output under controller 1 control.
Be packing stage below with working stage, mode of operation is velocity mode is example, introduces the control of controller to power set 2 and pressure control device 6.
The control mode of controller to power set 2 and pressure control device 6 can be, when the pressure of low side pump 3 output is less than preset pressure, controller 1 is according to the pressure of low side pump 3 output, control power set 2 and improve driving force, to improve the rotating speed of low side pump 3, when the pressure of low side pump 3 output is not less than preset pressure, controller 1 controls pressure control device 6 in servo-control system, and control power set 2 and change driving force and maintain within the scope of preset rotation speed to make the rotating speed of low side pump, wherein preset rotation speed can be the minimum speed of low side pump.
In the present embodiment, the control of controller 1 pair of pressure control device 6 can be that controlled pressure control device 6 starts the pressure regulating low side pump 3 output, to make the pressure of output for the setting value in pressure control device 6.
In the present embodiment, the setting value in preset pressure and pressure control device 6 is all within the scope of the dwell pressure of packing stage.Dwell pressure scope is the pressure limit of low side pump 3 output allowed in packing stage.The pressure that the pressure of low side pump 3 output is less than preset pressure and low side pump 3 output can not meet the pressure of packing stage needs, now, controller 1 controls low side pump 3 rotating speed by controlling power set 2 improves, with the pressure making the pressure of low side pump 3 output meet packing stage needs.
When the pressure of low side pump 3 output is not less than the setting value of pressure control device 6, control the setting value of low side pump 3 output output pressure control device 6.Here, the setting value of pressure control device 6 can be set according to the needs oneself producing product by user.In the present embodiment, pressure control device 6 is preferably proportional pressure control valve.
Refer to Fig. 4, it illustrates the structure chart of the controller of a kind of servo-control system that the application provides, comprising: acquiring unit 11, judging unit 12, computing unit 13 and control unit 14, wherein,
Acquiring unit 11, for being packing stage at working stage, and when mode of operation is velocity mode, obtains the pressure of current low side pump 3 output.
Judging unit 12, for judging whether the pressure of low side pump 3 output is less than preset pressure.
Computing unit 13, for judging that the pressure of low side pump 3 output is less than preset pressure at judging unit 12, calculate the pressure of servo-control system low and middle-end pump 3 output and the difference of preset pressure, and draw the tachometer value of low side pump 3 according to mathematic interpolation.
First control unit 14, for controlling according to tachometer value the rotating speed that power set improve low side pump 3.
Second control unit 15, for judging that the pressure of low side pump 3 output is not less than preset pressure at judging unit 12, control pressure control device 6 in servo-control system, and control power set the rotating speed of described low side pump is maintained within the scope of preset rotation speed.
In the present embodiment, injection machine enters packing stage, and it is packing stage that mode selection module 5 selectes current working phase, and mode of operation is velocity mode.Controller 1 is packing stage at current working phase, and mode of operation is when being velocity mode, receive the pressure of low side pump 3 output collected by pressure sensor 7, obtain the pressure of current low side pump 3 output, as the current pressure of low side pump 3, judge whether the pressure of servo-control system low and middle-end pump 3 output is less than preset pressure with Time Controller 1.When the pressure of low side pump 3 output is not less than preset pressure, control pressure control device 6 in servo-control system, setting value in output pressure control device 6, the pressure of low side pump output terminal is regulated by pressure control device 6, and control power set the rotating speed of described low side pump is maintained within the scope of preset rotation speed, so that the pressure of low side pump 3 output is regulated within the scope of dwell pressure; When the pressure of low side pump 3 output is less than preset pressure, controller 1 calculates the pressure of servo-control system low and middle-end pump 3 output and the difference of preset pressure, and the tachometer value of low side pump 3 is calculated further according to difference, tachometer value is sent to power set 2, the rotating speed being controlled servo-control system low and middle-end pump 3 by power set 2 is improved, and the pressure of low side pump 3 output is regulated within the scope of dwell pressure.
It should be noted that, the pressure under the velocity mode of the packing stage that the preset pressure in the present embodiment sets in advance for mode selection module 5 in controller 1 needed for pressure maintaining period.Certainly, preset pressure can also be arranged in model choice module 5 or other modules, preset pressure is sent to controller 1.
The servo-control system that the application provides lets out high low side pump in being changed into by the gear pump in injection machine system, by the mode of letting out in increasing, oil temperature in low side pump is reduced fast, reduces high oil temperature to the wearing and tearing of the mechanical part in low side pump.Simultaneously in the packing stage of velocity mode, when the pressure of low side pump output terminal is not less than preset pressure, controller controls the rotating speed of low side pump within the scope of preset rotation speed; When the pressure of low side pump output terminal is less than preset pressure, controller is according to the pressure of low side pump output terminal, and the rotating speed controlling low side pump improves.That is at whole packing stage, low side pump is in running status always, now extraneously provides the oil of lubrication to flow to low side pump for low side pump always, and pump obtains lubrication and cooling, thus greatly reduces the wearing and tearing of mechanical part, thus solves pump loss problem.
Further, the application controls power set in real time by the size of the pressure and preset pressure that judge servo-control system low and middle-end pump output terminal and pressure control device maintains within the scope of preset rotation speed to regulate low side revolution speed, namely semi-loop and full closed loop control mode is adopted at packing stage, under ensureing that servo-control system realizes the object of long-time pressurize, also achieve energy-conservation object simultaneously.
In addition, the mode selection module of the servo-control system that the application provides can be arranged on its exterior, the convenient change to servo-drive system pressurize pattern and selection, the pattern of producing needed for different process product is made to carry out any switching laws, the system that avoids is produced different process product and needs again parameter-embedded step, be convenient to Dynamic System, save human resources.
Meanwhile, this application discloses a kind of pressurize method of servo-control system, be applied in above-mentioned servo-control system, refer to Fig. 5, it illustrates a kind of flow chart of the pressurize method of a kind of servo-control system that the application provides, comprising:
Step 101: select the current working phase of injection machine and mode of operation corresponding to current working phase.
The whole technological process process that servo-control system manufactures a finished product can comprise: close mode step section, injection stage, packing stage, storing stage, penetrate the stage of moving back, cooling stage, die sinking stage and ejection phase.Wherein, specific pattern is all set with to each action phase servo-control system, when production product process often enters a new element stage, servo-control system selects working stage and mode of operation according to mode selection module, shows the working condition residing for current injection machine.
Wherein, refer to Fig. 6, it illustrates a kind of sub-process figure of the pressurize method of a kind of servo-control system that the application provides, this sub-process figure provides a kind of possible mode chosen, and comprising:
Step 1011: set mode of operation corresponding to each stage and the preset pressure needed for mode of operation and preset rotation speed.
In the whole technological process process that servo-control system manufactures a finished product, each action phase is set with specific pattern, here kind and the characteristic of product can be generated according to injection machine, before injection machine carries out production process, in advance the pattern of every one-phase is arranged in advance.Meanwhile, in packing stage, the mode selection module of servo-control system presets dwell pressure value, i.e. preset pressure.
It should be noted that, the pressure under the velocity mode of the packing stage that the preset pressure in the present embodiment sets in advance for mode selection module 5 in controller 1 needed for pressure maintaining period.Certainly, preset pressure can also be arranged in model choice module 5 or other modules, preset pressure is sent to controller 1.
Step 1012: the working stage according to current injection machine selects the mode of operation corresponding with working stage.
In the present embodiment, injection machine enters packing stage, selects velocity mode.In the pressure maintaining period of velocity mode, low side pump maintains low-speed running, ensures the pressure stability of low side pump output terminal and the moment meets the dwell pressure of packing stage needs.Meanwhile, extraneous provide the oil of lubrication to flow to low side pump for low side pump, pump obtains lubrication and cooling always.
Step 102: be packing stage at current working phase, and when mode of operation is velocity mode, obtain the pressure of servo-control system low and middle-end pump output terminal.
In the present embodiment, servo-control system by the pressure of pressure sensor moment monitoring low side pump output terminal, and sends to controller by monitoring the pressure obtained.
Step 103: judge whether the pressure of servo-control system low and middle-end pump output terminal is less than preset pressure, if the pressure of servo-control system low and middle-end pump output terminal is less than preset pressure, perform step 104, if the pressure of servo-control system low and middle-end pump output terminal is not less than preset pressure, perform step 105.
Step 104: controller is according to the pressure of low side pump output terminal, and the power set controlled in servo-control system improve the rotating speed of low side pump.
Refer to Fig. 7, it illustrates the another kind of sub-process figure of the pressurize method of a kind of servo-control system that the application provides, this sub-process illustrates the one possibility mode that the present embodiment controls rotating speed, comprising:
Step 1041: calculate the difference between preset pressure and the pressure of low side pump output terminal.
Step 1042: the tachometer value drawing low side pump according to mathematic interpolation.
Step 1043: control the rotating speed that power set improve low side pump according to tachometer value.
In the present embodiment, controller receives the pressure of the servo-control system low and middle-end pump output terminal sent by pressure sensor, compares with preset pressure simultaneously.When the pressure of servo-control system low and middle-end pump output terminal is less than preset pressure, the pressure of low side pump output terminal can not meet the dwell pressure of packing stage demand, now, controller calculates the difference between preset pressure and the pressure of low side pump output terminal, the tachometer value of low side pump is drawn further according to this mathematic interpolation, the tachometer value of the low side pump calculated is sent to power set by controller, control the rotating speed that power set control servo-control system low and middle-end pump, the rotating speed of low side pump is improved, until the pressure of low side pump output terminal regulates within the scope of dwell pressure.
In the present embodiment, at packing stage, dwell pressure, for guaranteeing the sizing of product, stablizes the size of finished product, and in controller, the setting value of preset pressure will set according to the planform of finished product.For producing the large product of wall thickness, just longer in the dwell time that packing stage needs, namely require that low side pump maintains minimum speed running and ensures that low side pump discharge pressure long-time stable is in pressurize value.
But, the rotating speed of low side pump within a short period of time is directly proportional to the pressure of output, minimum speed can ensure the stable of output pressure, but due to the height let out in low side pump self, the quality of sealing and needed for low side pump each time of running how many differences of oily flow, the situations such as oil mass flow discrepancy is even make the rotating speed of low side pump not be directly proportional to the pressure of output, when low side pump operation is at minimum speed, the pressure of its output is less than preset pressure, dwell pressure needed for packing stage is inadequate, therefore need to control by controller the rotating speed raising that power set realize controlling low side pump, to ensure that the pressure of low side delivery side of pump regulates within the scope of dwell pressure.
Step 105: controller controls pressure control device in servo-control system, and control power set the rotating speed of low side pump is maintained within the scope of preset rotation speed.
When the pressure of servo-control system low and middle-end pump output terminal is not less than preset pressure, the pressure of low side pump output terminal is excessive, the product generation excessive compression of production can be caused and cause distortion, damage, therefore, need to regulate the pressure of low side pump output terminal by controlling pressure control device in servo-control system.
In the present embodiment, in servo-control system, pressure control device is provided with setting value, when the pressure of low side pump output terminal is not less than the setting value of pressure control device, controls the setting value of low side delivery side of pump output pressure control device.Here, the setting value of pressure control device can be set according to the needs oneself producing product by user.
It should be noted that, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
A kind of servo-control system provided the application above and method are described in detail, apply specific case herein to set forth the principle of the application and embodiment, the explanation of above embodiment is just for helping method and the core concept thereof of understanding the application; Meanwhile, for one of ordinary skill in the art, according to the thought of the application, all will change in specific embodiments and applications, in sum, this description should not be construed as the restriction to the application.
Claims (7)
1. a servo-control system, is applied in injection machine, comprises: power set and hydraulic means, is characterized in that, also comprises: inside let out high low side pump, mode selection module, controller, pressure control device and pressure sensor, wherein,
Described low side pump is connected between described power set and described hydraulic means, and the changes mechanical energy for being produced by described power set is hydraulic energy, and described hydraulic energy is supplied to described hydraulic means; Described low side pump is screw pump;
Described mode selection module, is connected with described controller, and for selecting the mode of operation that each working stage is corresponding, the mode of operation that wherein packing stage is corresponding is velocity mode;
Described pressure sensor, for gathering the pressure of described low side pump output terminal, and sends to described controller by described pressure;
Described controller, with described power set, described mode selection module and described pressure sensor are connected, for according to described working stage, the pressure of described mode of operation and described low side pump output terminal, control described power set and described pressure control device, wherein, be packing stage at described working stage, when described mode of operation is velocity mode, when the pressure of described low side pump output terminal is less than preset pressure, described controller is according to the pressure of described low side pump output terminal, control the rotating speed that described power set improve low side pump, when the pressure of described low side pump output terminal is not less than preset pressure, described controller controls pressure control device in described servo-control system, and control described power set the rotating speed of described low side pump is maintained within the scope of preset rotation speed,
Described pressure control device connects with described controller, for regulating the pressure of described low side pump output terminal under described controller control.
2. system according to claim 1, is characterized in that, described mode selection module comprises:
Setup unit, for setting preset pressure needed for mode of operation corresponding to each stage and described mode of operation and preset rotation speed;
Selection unit, selects the mode of operation corresponding with described working stage for the working stage according to current injection machine.
3. system according to claim 1, is characterized in that, described controller comprises:
Acquiring unit, for being packing stage at described working stage, and when described mode of operation is velocity mode, obtains the pressure of current described low side pump output terminal;
Judging unit, for judging whether the pressure of described low side pump output terminal is less than preset pressure;
Computing unit, for judging that the pressure of described low side pump output terminal is less than preset pressure at described judging unit, calculate the described pressure of servo-control system low and middle-end pump output terminal and the difference of preset pressure, and draw the tachometer value of described low side pump according to described mathematic interpolation;
First control unit, for controlling the rotating speed that described power set improve described low side pump according to described tachometer value;
Second control unit, for judging that the pressure of described low side pump output terminal is not less than preset pressure at described judging unit, control pressure control device in described servo-control system, and control described power set the rotating speed of described low side pump is maintained within the scope of preset rotation speed.
4. system according to claim 1, is characterized in that, described pressure control device is proportional pressure control valve.
5. a pressurize method for servo-control system, is applied in the servo-control system as described in any one of Claims 1-4, it is characterized in that, comprising:
Select the current working phase of described injection machine and mode of operation corresponding to described current working phase;
Be packing stage at described current working phase, and when described mode of operation is velocity mode, obtain the pressure of described servo-control system low and middle-end pump output terminal; Described low side pump is screw pump;
Judge whether the pressure of described servo-control system low and middle-end pump output terminal is less than preset pressure;
When the pressure of described low side pump output terminal is less than described preset pressure, according to the pressure of described low side pump output terminal, the power set controlled in described servo-control system improve the rotating speed of low side pump;
When the pressure of described low side pump output terminal is not less than preset pressure, control pressure control device in described servo-control system, and control described power set the rotating speed of described low side pump is maintained within the scope of preset rotation speed.
6. method according to claim 5, is characterized in that, the current working phase of the described injection machine of described selection and mode of operation corresponding to described current working phase comprise:
Set mode of operation corresponding to each stage and the preset pressure needed for described mode of operation and preset rotation speed;
Working stage according to current injection machine selects the mode of operation corresponding with described working stage.
7. method according to claim 5, is characterized in that, according to the pressure of described low side pump output terminal, the rotating speed raising controlling described servo-control system low and middle-end pump comprises:
Difference between the pressure calculating described preset pressure and described low side pump output terminal;
The tachometer value of described low side pump is drawn according to described mathematic interpolation;
The rotating speed that described power set improve described low side pump is controlled according to described tachometer value.
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| JP6716835B2 (en) * | 2016-03-04 | 2020-07-01 | 株式会社神戸製鋼所 | Gear pump control method and gear pump control device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1256196A (en) * | 1998-12-10 | 2000-06-14 | 住友重机械工业株式会社 | Injection control method for injection moulding machine |
| CN101623920A (en) * | 2009-07-30 | 2010-01-13 | 桂林星辰科技有限公司 | Energy-saving servo hydraulic control system for injection machine and control method thereof |
| CN101691877A (en) * | 2009-09-04 | 2010-04-07 | 佛山市顺德区震德塑料机械有限公司 | Servo motor control-based multi-pump combination controlled hydraulic power system |
-
2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1256196A (en) * | 1998-12-10 | 2000-06-14 | 住友重机械工业株式会社 | Injection control method for injection moulding machine |
| CN101623920A (en) * | 2009-07-30 | 2010-01-13 | 桂林星辰科技有限公司 | Energy-saving servo hydraulic control system for injection machine and control method thereof |
| CN101691877A (en) * | 2009-09-04 | 2010-04-07 | 佛山市顺德区震德塑料机械有限公司 | Servo motor control-based multi-pump combination controlled hydraulic power system |
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