CN101623920A - Energy-saving servo hydraulic control system for injection machine and control method thereof - Google Patents
Energy-saving servo hydraulic control system for injection machine and control method thereof Download PDFInfo
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Abstract
The invention discloses an energy-saving servo hydraulic control system for an injection machine with multi-pump confluence and a control method thereof. The system comprises N branches, and each branch comprises a servo controller, a servo motor, an oil pump and a check valve, and accesses to an injection machine hydraulic loop in a gathering way. A main control template is connected with a host control computer and each servo controller. Each motor is provided with a speed measurement element which is connected with the servo controller thereof, rotational speed feedback signals of a main servo controller access to a control unit, and the hydraulic loop is provided with a pressure sensor. The control method comprises the following steps: a host computer provides flow and pressure set signals according to an injection molding flow; regulating signals of the flow and the pressure are obtained by the system according to a command of the host computer and the rotational speed and pressure feedback signals to solve the amount of starting motors and the rotational speed of the motors; and a plurality of pumps are controlled to cooperatively work to cause total flow of the hydraulic loop to follow the flow set signals and total pressure of the hydraulic loop to follow the pressure set signals. The invention satisfies the requirements of high-power running and low-power running of equipment, has accurate and agile control, and is obvious to save the energy.
Description
(1) technical field
The present invention relates to the injection machine technical field, be specially the energy-saving servo hydraulic control system for injection machine and the control method thereof at a kind of many pumps interflow.
(2) background technology
The hydraulic system of injection machine comprises the oil pump of motor and drive thereof, and the rotating speed of control motor can be controlled the rotating speed of oil pump, and then the pressure or the flow of control hydraulic circuit, reaches the purpose of controlling each mechanism of injection machine.
Be directly to drive oil pump with asynchronous motor in early days, this hydraulic injection molding machine system is difficult to energy-conservation.The Frequency Converter Control asynchronous motor is adopted in the back, though certain energy-saving effect is arranged, the common asynchronous moter power consumption is high, and the injection moulding response speed is slow, and efficient is low.And the repeatable accuracy of injection is low.Particularly can't realize Energy Saving Control during the slow-speed of revolution.
Recent hydraulic injection molding machine system adopts " servomotor+controller " to drive oil pump, obtains good energy-saving effect and control accuracy, positive extensive use.For example application number is that 200610155035.8 application for a patent for invention " energy-saving servo injection molding machine ", application number are that 200420110348.8 utility model patent " a kind of employing AC servo control hydraulic pressure variable type injection machine ", application number are that 200520058838.2 utility model patent " injection machine oil pressure Servocontrol device ", application number are 200520056512.6 utility model patent " the energy-efficient full cut-off ring of SERVO CONTROL injection machine " etc.
Application number is 200710069994.2 application for a patent for invention " servo energy-saving control system of injection machine " adopts pressure sensor detection oil circuit pressure, speed probe detection motor speed, detection signal is directly exported to servo controller after treatment, the moment of torsion and the rotating speed of control motor are promptly controlled fluid pressure and flow that oil pump pumps.Formed closed-loop system between motor, detection part and the oil pump, energy-saving effect has preferably been arranged.
But in order to guarantee bigger working flow, pressure and mechanism's speed of service, the hydraulic injection molding machine system of this class need be equipped with the bigger oil pump of unit speed flow, thereby also needs to strengthen with the power capacity of supporting motor of oil pump and driver thereof.The current class of present common high-power electronic switch module is difficult to reach required size, restricted by it, and powerful servo controller price is higher, thereby the cost of hydraulic control system rises.In addition when injection machine is in packing stage, the hydraulic circuit leak of liquid seldom, oil pump only need pump the pressure stability that flow seldom just can be kept hydraulic system; Even but the bigger oil pump flow that its flow that pumps has also leaked greater than hydraulic circuit at minimum speed of unit speed flow can cause hydraulic system pressure to rise, influence the injection moulding quality.Excessive for fear of hydraulic system pressure, common way is that the eduction valve pressure release is installed on hydraulic circuit, causes the waste of energy.Even the influence that pressure rises in the hydraulic circuit when packing state of tolerance injection machine, this moment, machine operation turned round under the slow-speed of revolution, high pulling torque state, and power consumption is also very big.
Therefore making up the hydraulic control system of more energy-conservation, economic large size plastic jetting-moulding device, is the research focus of present hydraulic injection molding machine control technology.
(3) summary of the invention
The purpose of this invention is to provide the energy-saving servo hydraulic control system for injection machine and the control method thereof at a kind of many pumps interflow, equipment cost is low, control is accurate, good energy-conserving effect.
The energy-saving servo hydraulic control system for injection machine at many pumps interflow of the present invention's design comprises hydraulic circuit, the oil pump of pressure is provided and drives the motor of oil pump and the control module of control motor to hydraulic circuit, its difference is, it comprises N motor pump branch road, N is 2～20 positive integer, and the size of N is by the flow and the pressure decision of the hydraulic circuit of injection machine technological requirement; Each branch road comprises servo controller, servomotor and oil pump, check valve; The servo controller of each branch road connects servomotor, and servomotor connects oil pump, and the oil pump inlet is outer to connect fuel tank, outlet is connected to check valve, and the N behind the check valve oil pump exports and gather the hydraulic circuit that inserts injection machine; The one servo controller is the main servo controller in N the branch road, and its motor that connects is main motor, and all the other servo controllers are from servo controller.The master control template has control module, main setup unit, from the setting signal allocation units, enable control module; Control module respectively with main setup unit, enable control module and be connected; The control module of master control template and enable control module and connect a total control computer outward, accept the main setting signal and the enable signal to the hydraulic injection molding machine system of upper total control computer, main setting signal is flow setting signal Q (t), and promptly the working procedure by injection machine provides corresponding flow setting value Q (t) at different time t.Enable control module and be connected with the servo controller of N branch road, main setup unit connects the main servo controller and from the setting signal allocation units, from the setting signal allocation units with respectively be connected from servo controller.
Enable control module and prestore main setting signal and the corresponding relation that starts pump quantity, depend on main flow setting signal scope, the parameter of oil pump, the injection machine performance set, obtain from test, enable control module and have the program that obtains to start pump quantity n (t) according to flow signal, enable control module and make the enable signal of main servo controller always effective, and send out to corresponding oil pump and to enable control signal;
There is the ratio of the rotary speed setting signal and the main motor servo controller rotary speed setting signal of each branch road motor servo controller from the setting signal allocation units, and has main setting signal and the above-mentioned preset proportion exported by main setup unit to try to achieve the program of each servo controller rotating speed from setting signal.
The control module of this control system master control template has flow closed loop calculation function piece, and the quantity and the hydraulic circuit flow corresponding relation data of main motor speed, startup pump are arranged in this module; The corresponding relation data depend on the traffic requirement of hydraulic circuit and the performance of oil pump, obtain from test.This flow closed loop calculation function piece is scaled main motor speed setting signal W with flow signal in addition
Q1 program.
Control module also can have pressure closed loop calculation function piece, the main setting signal of upper total control computer also has pressure signal, promptly the working procedure by injection machine provides corresponding pressure set points P (t) at different time t, and with good grounds pressure signal is tried to achieve main motor speed setting signal W in the pressure closed loop calculation function piece
P1 program.Main setup unit has control model selection function piece, this module main motor speed setting signal that selection obtains according to flow signal is arranged or the main motor speed setting signal that obtains according to pressure signal as the option program of the main motor speed setting signal of main servo controller.
Each motor of this control system is equipped with detecting element, and each detecting element is connected with its servo controller, the speed feedback signal Access Control unit of main servo controller.The flow closed loop calculation function piece of control module also has flow setting signal and main rotating speed of motor signal operation according to upper total control computer, tries to achieve the program of flow regulating signal.
This control system hydraulic circuit also can be equipped with pressure sensor, and pressure sensor is connected with control module.The pressure closed loop calculation function piece of control module also the pressure setting signal of with good grounds upper total control computer and pressure sensor the pressure feedback signal computing, try to achieve the program of pressure adjustment signal.
Main setup unit has control model selection function piece, according to the option program that prestores select Flow-rate adjustment or pressure controlled signal as the rotary speed setting signal of main servo controller, make this control system work in flow closed loop mode or pressure closed loop pattern.
The master control template is according to the main setting signal and the enable signal of upper total control computer, sends instruction to the servo controller of each branch road and makes it do the work of speed closed loop, and constitute flow or the big closed loop of pressure, realizes many pumps interflow.
The injection machine energy-saving servo-hydraulic control method at many pumps interflow of the present invention's design is:
I, upper total control computer be according to the needs of injection moulding process, to the control module transmitted traffic setting signal Q (t) of master control template, sends and enable control signal to the control module that enables of master control template;
The control module that enables of II, master control template sends instruction to the main servo controller, makes the enable signal of main servo controller always effective;
III, control module obtain main rotating speed of motor setting signal according to the storage program by main setting signal Q (t), send into main setup unit and enable control module;
IV, main setup unit will obtain that main rotating speed of motor setting signal is sent to the main servo controller by the speed feedback signal of main setting signal Q (t) and main servo controller and with the corresponding relation of flow and from the setting signal allocation units;
V, enable control module and obtain the pump quantity n (t) that should open this moment, send enable signal from servo controller to each branch road is relevant by the main setting signal Q (t) of control module;
VI, from the setting signal allocation units with main rotating speed of motor setting signal as input signal, according to the ratio of the rotary speed setting signal and the main servo controller rotary speed setting signal of each servo controller of deposit, the rotating speed of trying to achieve each servo controller is from setting signal and send into each servo controller;
VII, each branch road servo controller are pressed setting signal control motor and oil pump operation.
When each motor of this control system is equipped with detecting element, each detecting element and is connected with its servo controller, the detecting element of each motor feeds back to its servo controller with tach signal, each servo controller is regulated motor speed by former rotary speed setting signal, and each servo controller, motor and detecting element are pressed the speed closed loop mode operation.
When the flow closed loop calculation function piece of the speed feedback signal Access Control unit of main servo controller and control module also has according to the flow setting signal of upper total control computer and main rotating speed of motor signal operation, when trying to achieve the program of flow regulating signal, native system can move by the flow closed loop mode:
The flow closed loop calculation function piece of control module obtains current Q (t) by upper master control computer dynamic, and from the current main motor speed signal W1 of the dynamic acquisition of main servo controller, and obtain the flow feedback signal according to the corresponding relation of the main motor speed W1 that prestores and hydraulic circuit total flow, try to achieve flow regulating signal Q ' (t) by known control closed loop principle calculating; Control module is that setting signal calculates main motor speed conditioning signal W (t) with Q '
Q1 sends into main setup unit as main setting signal; Control module (t) is delivered to Q ' to enable control module, enables quantity n ' that control module (t) obtains starting pump according to Q ' (t), sends enable signal to the corresponding servo controller of each branch road.Press current main setting signal W from the setting signal allocation units
Q1 sends rotating speed from setting signal to the respective branch servo controller.The control module of master control template obtains the flow feedback signal by the current main rotating speed of motor W1 of dynamically reading of main servo driver.When the flow feedback signal equals former setting signal Q ' (t) time, keep current main motor speed W1; When the flow feedback signal is greater than or less than setting value Q ' (t) time, the flow closed loop calculation function piece of control module reduces or increases Q ' value (t), and main rotating speed of motor sets value W
Q1 correspondingly reduces or increases, and each branch road flow is corresponding to be reduced or increase, total flow reduces thereupon or increase, and so goes round and begins again; The synthetic operation of many pumps makes total flow follow flow setting signal, realizes the flow closed-loop control.Meanwhile, enable control module and dynamically read current Q ' value (t), obtain dynamic n ' and (t) send corresponding enable signal, make respective branch the oil pump input or deactivate.
When the control module of this control system master control template also has pressure closed loop calculation function piece, when hydraulic circuit is equipped with pressure sensor, the main setting signal of upper total control computer also has pressure setting signal P (t), main setup unit has control model selection function piece, the main motor speed setting signal W that this module has selection to obtain according to flow signal
Q1 or the main motor speed setting signal W that obtains of pressure signal
P1 option program as the main motor speed setting signal of main servo controller, this option program is for selecting W
Q1 and W
PRelatively change the little rotary speed setting signal as the main servo controller with previous moment in 1, native system also can be by flow closed loop mode and pressure closed loop mode operation:
The pressure closed loop calculation function piece of control module obtains current P (t) by upper master control computer dynamic, and dynamically obtain the pressure feedback signal of hydraulic circuit from pressure sensor, try to achieve pressure adjustment signal P ' (t) by known control closed loop principle calculating, control module is that setting signal calculates main motor speed conditioning signal W (t) with P '
P1 sends into main setup unit.The option program of main setup unit is from speed setting conditioning signal W
Q(t) and W
P(t) Dynamic Selection and previous moment relatively change the little rotary speed setting signal as the main servo controller in, and send to the main servo controller and from the setting signal allocation units.
From the current main setting signal W of setting signal allocation units foundation
Q(t) or W
P(t) try to achieve each servo controller rotary speed setting signal, and the servo controller of sending to corresponding branch road is controlled it and is done the pressure closed loop operation.
The control module of master control template dynamically reads pressure feedback signal by pressure sensor.When pressure feedback signal equals setting signal, keep (t) value of current P '; When pressure feedback signal is greater than or less than setting value, the pressure closed loop calculation function piece of control module reduces or increases P ' value (t), corresponding main rotating speed of motor setting value reduces or increases, each branch road rotating speed of motor setting value is corresponding to be reduced or increases, each branch road flow is corresponding to be reduced or increase, gross pressure reduces thereupon or increase, and so goes round and begins again; The synthetic operation of many pumps makes gross pressure follow pressure setting signal P (t), realizes pressure closed loop control.Meanwhile, enable control module and dynamically read current P ' value (t), and obtain n ' (t), dynamically send corresponding enable signal according to P ' value (t) and the corresponding relation that starts pump, make respective branch the oil pump input or deactivate.
Upper total control computer is to provide Q (t) and P (t) setting signal according to the Shooting Technique process, and this many pumps Confluent control system is controlled the collaborative work of many pumps, realizes the closed-loop control of Q (t) or P (t), can realize the technical process of total control computer expectation.
The advantage of this energy-saving servo hydraulic control system for injection machine and control method is: 1, adopt many cover Servocontrol devices, be divided into master and slave structure, form the system at many pumps interflow, can satisfy the requirement of high-power operation of equipment and small-power operation simultaneously; 2, dispose pressure closed loop control and flow closed-loop control, control accurate, quick; 3, need not high-power driving equipment, cost significantly reduces; 4, the packing stage of injection machine has only a motor and oil pump to guarantee the pressure of hydraulic circuit, and hydraulic circuit can be not excessive, and energy-saving effect is obvious.
(4) description of drawings
Fig. 1 is the structural representation of this energy-saving servo hydraulic control system for injection machine embodiment;
Be labeled as among the figure: 1, master control template; 2, detecting element; 3, check valve; 4, hydraulic circuit;
Fig. 2 is the schematic flow sheet of this injection machine energy-saving servo hydraulic control method embodiment.
(5) specific embodiment
The energy-saving servo hydraulic control system for injection machine embodiment at the many pumps of the present invention interflow is made up of 4 branch roads as shown in Figure 1; Each branch road comprises the servomotor of servo controller, same size and detecting element 2, oil pump, check valve 3; Detecting element 2 is installed on each servomotor, and is connected with each servo controller, each servo controller, servomotor and the known speed closed loop of detecting element 2 formations system; Each branch road servomotor connects that oil pump, oil pump inlet are outer to be connected the outlet that fuel tank, each oil pump outlet install behind 3,4 oil pump check valves 3 of check valve and gather the hydraulic circuit 4 that inserts injection machine; Hydraulic circuit 4 is equipped with pressure sensor; No. 1 servo controller is main servo controller, 2-4 number for from servo controller; Main servo motor that controller connects is main motor.Each motor is equipped with detecting element 2, and each detecting element 2 is connected with its servo controller.
Master control template 1 has control module, main setup unit, from the setting signal allocation units, enable control module; Control module respectively with main setup unit, enable control module and be connected.The control module of master control template 1 and enable control module and connect a total control computer is outward accepted the main setting signal flow Q (t) and the pressure P (t) of upper total control computer, in addition enable signal.Enable control module and be connected with the servo controller of 4 branch roads, main setup unit connects the main servo controller and from the setting signal allocation units, from the setting signal allocation units with respectively be connected from servo controller.The speed feedback signal Access Control unit of main servo controller.The pressure sensor that hydraulic circuit 4 is installed is connected with control module.
The control module of this control system master control template 1 has flow closed loop calculation function piece, and the quantity and the hydraulic circuit 4 flow corresponding relation data of main motor speed, startup pump are arranged in this module; The corresponding relation data depend on the traffic requirement of hydraulic circuit 4 and the performance of oil pump, obtain from test.This relation data is as shown in table 1 in this example:
Table 1
| Main motor actual speed | Oil pump 1 | Oil pump 2 | Oil pump 3 | Oil pump 4 | The hydraulic circuit total flow |
| ??W1 | Work | Shut down | Shut down | Shut down | ??W1*k1 |
| ??W1 | Work | Work | Shut down | Shut down | ??W1*k2 |
| ??W1 | Work | Work | Work | Shut down | ??W1*k3 |
| ??W1 | Work | Work | Work | Work | ??W1*k4 |
The current tach signal W1 of the also with good grounds main motor feedback of the flow closed loop calculation function piece of control module obtains the flow value of feedback of current hydraulic circuit 4 and relatively tries to achieve flow regulating signal Q ' (t) and be scaled main motor speed conditioning signal W with the flow setting signal Q (t) of upper total control computer by table 1 computing, evaluation
Q1 program.
The pressure setting signal P (t) of the with good grounds upper total control computer of pressure closed loop calculation function piece of control module and the pressure feedback signal computing of pressure sensor, try to achieve pressure adjustment signal P ' (t) and be scaled main motor speed conditioning signal W
P1 program.Main setup unit has control model selection function piece, and this module has selection W
Q1 or W
P1 changes the option program of less tach signal as the main servo controller.
There is the ratio of the rotary speed setting signal and the main motor servo controller rotary speed setting signal of each branch road motor servo controller from the setting signal allocation units, and has by main setting signal and above-mentioned preset proportion and try to achieve the program of each servo controller rotating speed from setting signal.Each servo controller rotating speed is from the ratio such as the table 2 of setting signal and main servo controller rotary speed setting signal in this example:
The ratio of each servo controller rotary speed setting signal of table 2 and main servo controller rotary speed setting signal
| The tach signal of main servo controller | Main setting signal | The rotating speed of servo controller 2 is from setting signal | The rotating speed of servo controller 3 is from setting signal | The rotating speed of servo controller 4 is from setting signal |
| ??W Q1 or W P1 | ??W Q1 or W P1 | ??α 2*W Q1 or W P1 | ??α 3*W Q1 or W P1 | ??α 4*W Q1 or W P1 |
α in the table 2
2-4Be the preset proportion coefficient, depend on that the flow of hydraulic circuit 4 or pressure require the performance with oil pump, obtain from test.Get α in this example
2=1, α
3=α
4=0.9.
Enable control module and prestore main setting signal and the corresponding relation that starts pump quantity, depend on main flow signal scope, the parameter of oil pump, the injection machine performance set, obtain, see Table 3 from test; Enable the with good grounds flow regulating signal Q ' of control module and (t) obtain to start pump quantity n ' program (t), when the computer enabled signal of upper master control is effective, sends out to corresponding oil pump and to enable control signal;
Table 3
| Flow regulating signal Q ' (t) | Oil pump 1 | Oil pump 2 | Oil pump 3 | Oil pump 4 | Pump startup quantity |
| ??Q′(t)≤1.0V | Work | Shut down | Shut down | Shut down | Single pump |
| ??1.0V＜Q′(t)≤5.0V | Work | Work | Shut down | Shut down | The double pump interflow |
| ??5.0V＜Q′(t)≤8.0V | Work | Work | Work | Shut down | Three pumps interflow |
| ??Q′(t)＞8.0V | Work | Work | Work | Work | Four pumps interflow |
Master control template 1 is according to master/slave setting signal and enable signal, sends instruction to the servo controller of each branch road and makes it do the work of speed closed loop, constitutes the control of flow closed-loop control or pressure closed loop, realizes many pumps interflow.
The injection machine energy-saving servo-hydraulic control method embodiment workflow at many pumps of the present invention interflow as shown in Figure 2, concrete steps are:
I, upper total control computer be according to the needs of injection moulding process, to the control module transmitted traffic setting signal Q (t) and the pressure setting signal P (t) of master control template 1, sends and enable control signal to the control module that enables of master control template 1;
The control module that enables of II, master control template 1 sends instruction to the main servo controller, makes the enable signal of main servo controller always effective; Main servo controller drive motors 1 drives oil pump 1 operation;
The flow closed loop calculation function piece of III, control module dynamically obtains current Q (t), dynamically obtains main motor speed feedback signal from the main servo controller, and obtaining current hydraulic circuit 4 flow feedback signals according to the corresponding relation of main motor speed W1 in the above-mentioned table 1 that prestores and hydraulic circuit 4 total flows, its institute's calculation procedure of depositing is tried to achieve flow regulating signal Q ' (t) by known control closed loop principle calculating; The storage program of control module (t) is asked and is obtained main rotating speed of motor and set conditioning signal W by flow regulating signal Q '
Q(t);
Correspondingly, the pressure closed loop calculation function piece of control module dynamically obtains current P (t), obtains pressure feedback signal from pressure sensor, and calculation procedure that this module is deposited calculates by known loop control theory and tries to achieve pressure adjustment signal P ' (t); The storage program pressing force conditioning signal P ' of control module (t) asks and obtains main rotating speed of motor and set conditioning signal W
P(t);
The option program that the main setup unit of IV, master control template 1 prestores is from speed setting conditioning signal W
Q(t) and W
P(t) Dynamic Selection and previous moment relatively change the little rotary speed setting signal as the main servo controller in, and send to the main servo controller and from the setting signal allocation units;
V, enable control module and dynamically obtain flow regulating signal Q ' (t), determine the current pump quantity n (t) that should open, send enable signal from servo controller accordingly to each branch road by control module, make respective branch the pump input or deactivate;
VI, from the setting signal allocation units with main rotating speed of motor setting signal W
Q(t) or W
P(t) as main setting signal, according to the ratio of the rotary speed setting signal and the main servo controller rotary speed setting signal of each servo controller of deposit, the rotating speed of trying to achieve each servo controller is from setting signal and send into each servo controller;
VII, each branch road servo controller are pressed the operation of rotary speed setting signal control driven by motor oil pump.
The detecting element 2 of each motor feeds back to tach signal each servo controller respectively, and by setting the rotating speed operation, each servo controller, motor and detecting element 2 are pressed the speed closed loop mode operation to each servo controller by feedback signal control motor.
Upper total control computer of this example provides the main setting signal Q (t) and the P (t) of flow and pressure according to the Shooting Technique process, this many pumps Confluent control system is according to upper master control computer instruction and speed feedback signal and pressure feedback signal, obtain the conditioning signal of flow and pressure, control the collaborative work of many pumps, make the total flow of hydraulic circuit 4 follow flow setting signal Q (t), gross pressure is followed pressure setting signal P (t), realize the closed-loop control of flow and pressure, can realize the technical process of total control computer expectation.
The foregoing description is the specific case that purpose of the present invention, technical scheme and beneficial effect are further described only, and the present invention is defined in this.All any modifications of within scope of disclosure of the present invention, being made, be equal to replacement, improvement etc., all be included within protection scope of the present invention.
Claims (8)
1, energy-saving servo hydraulic control system for injection machine comprises hydraulic control circuit, the oil pump of pressure is provided and drives the motor of oil pump and the control module of control motor to hydraulic circuit, it is characterized in that:
Native system comprises N motor pump branch road, and N is 2～20 positive integer, and each branch road comprises servo controller, servomotor and oil pump, check valve (3); The servo controller of each branch road connects servomotor, and servomotor connects oil pump, and the oil pump inlet is outer to connect fuel tank, outlet is connected to check valve (3), and N oil pump behind the check valve (3) exports and gather the hydraulic circuit (4) that inserts injection machine; The one servo controller is the main servo controller in N the branch road, and its motor that connects is main motor, and all the other servo controllers are from servo controller; Master control template (1) has control module, main setup unit, from the setting signal allocation units, enable control module; Control module respectively with main setup unit, from the setting signal allocation units with enable control module and be connected; The control module of master control template (1) and enable control module and connect a total control computer is outward accepted the main setting signal flow setting signal Q (t) and the enable signal to the hydraulic injection molding machine system of upper total control computer; Enable control module and be connected with the servo controller of N branch road, main setup unit connects the main servo controller and from the setting signal allocation units, from the setting signal allocation units with respectively be connected from servo controller;
The described control module that enables prestores main setting signal and the corresponding relation that starts pump quantity, also has the program that obtains to start pump quantity n (t) according to flow setting signal Q (t);
Described have the ratio of the rotary speed setting signal and the main motor servo controller rotary speed setting signal of each branch road motor servo controller from the setting signal allocation units, and have by main setting signal and above-mentioned preset proportion and try to achieve the program of each servo controller rotating speed from setting signal;
Described control module has flow closed loop calculation function piece, and the quantity and hydraulic circuit (4) the flow corresponding relation data of main motor speed, startup pump are arranged in this module, in addition flow signal is scaled main motor speed setting signal W
Q1 program.
2, energy-saving servo hydraulic control system for injection machine according to claim 1 is characterized in that:
Described each branch road motor is equipped with detecting element (2), and each detecting element (2) is connected with its servo controller.
3, energy-saving servo hydraulic control system for injection machine according to claim 2 is characterized in that:
Also there are flow setting signal and main rotating speed of motor signal operation according to upper total control computer in the speed feedback signal Access Control unit of described main servo controller, the flow closed loop calculation function piece of control module, try to achieve the program of flow regulating signal.
4, energy-saving servo hydraulic control system for injection machine according to claim 3 is characterized in that:
Described hydraulic circuit (4) is equipped with pressure sensor, and pressure sensor is connected with control module; Described control module also has pressure closed loop calculation function piece, the pressure setting signal P (t) of the with good grounds upper total control computer of this module and the pressure feedback signal computing of pressure sensor, try to achieve the program of pressure adjustment signal, and with good grounds pressure signal is tried to achieve main motor speed setting signal W
P1 program;
Described main setup unit has control model selection function piece, and this module has main motor speed setting signal that selection obtains according to flow signal or the pressure signal option program as the main motor speed setting signal of main servo controller, and this option program is for selecting W
Q1 and W
PRelatively change little rotary speed setting signal with previous moment in 1 as the main servo controller.
5, injection machine energy-saving servo-hydraulic control method is characterized in that step is as follows:
I, upper total control computer be according to the needs of injection moulding process, to the control module transmitted traffic setting signal Q (t) of master control template (1), sends and enable control signal to the control module that enables of master control template (1);
The control module that enables of II, master control template (1) sends instruction to the main servo controller, makes the enable signal of main servo controller always effective;
III, control module obtain main rotating speed of motor setting signal according to the storage program by main setting signal Q (t), send into main setup unit and enable control module;
IV, main setup unit will obtain main rotating speed of motor setting signal by main setting signal Q (t) and send to the main servo controller;
V, enable control module and obtain the pump quantity n (t) that should open this moment, send enable signal from servo controller to each branch road is relevant by the main setting signal of control module;
VI, from the setting signal allocation units with main rotating speed of motor setting signal as main setting signal, according to the ratio of the rotary speed setting signal and the main servo controller rotary speed setting signal of each servo controller of deposit, the rotating speed of trying to achieve each servo controller is from setting signal and send into each servo controller;
VII, each branch road servo controller are pressed setting signal control motor and oil pump operation.
6, injection machine energy-saving servo-hydraulic control method according to claim 5 is characterized in that:
Described each motor is equipped with detecting element (2), when each detecting element (2) is connected with its servo controller, the detecting element of each motor (2) feeds back to its servo controller with tach signal, each servo controller is regulated motor speed by former rotary speed setting signal, and each servo controller, motor and detecting element (2) are pressed the speed closed loop mode operation.
7, injection machine energy-saving servo-hydraulic control method according to claim 6 is characterized in that:
The flow closed loop calculation function piece of the speed feedback signal Access Control unit of described main servo controller and control module also has flow setting signal and main rotating speed of motor signal operation according to upper total control computer, tries to achieve the program of flow regulating signal, the operation of native system pressing force closed loop mode:
Described III is in the step, the flow closed loop calculation function piece of control module obtains current Q (t) by upper master control computer dynamic, and from the current main motor speed signal W1 of the dynamic acquisition of main servo controller, and obtaining the flow feedback signal according to the corresponding relation of the main motor speed signal W1 that prestores and hydraulic circuit (4) total flow, calculating is tried to achieve flow regulating signal Q ' (t); Control module is that setting signal calculates main motor speed conditioning signal W (t) with Q '
Q1 sends into main setup unit, and control module (t) is delivered to Q ' to enable control module; Described V is in the step, enables quantity n ' that control module (t) obtains starting pump according to Q ' (t).
8, injection machine energy-saving servo-hydraulic control method according to claim 7 is characterized in that:
Described control module also has pressure closed loop calculation function piece, hydraulic circuit (4) is equipped with pressure sensor, upper total control computer is according to the needs of injection moulding process, also the control module to master control template (1) sends pressure setting signal P (t), described main setup unit has control model selection function piece, the main motor speed setting signal W that this module has selection to obtain according to flow signal
Q1 or the main motor speed setting signal W that obtains of pressure signal
P1 option program as the main motor speed setting signal of main servo controller, native system is pressed flow and pressure closed loop mode operation:
Described III is in the step, the pressure closed loop calculation function piece of control module obtains current P (t) by upper master control computer dynamic, and dynamically obtain the pressure feedback signal of hydraulic circuit (4) from pressure sensor, calculating is tried to achieve pressure adjustment signal P ' (t), and control module is that setting signal calculates main motor speed setting signal W (t) with P '
P1 sends into main setup unit; Described IV is in the step, and the option program of main setup unit storage is selected W
Q1 and W
PRelatively change little conduct master rotating speed of motor signal with previous moment in 1 and send to the main servo controller.
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