CN102632599B - A kind of control system of injection machine - Google Patents

A kind of control system of injection machine Download PDF

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Publication number
CN102632599B
CN102632599B CN201210082836.1A CN201210082836A CN102632599B CN 102632599 B CN102632599 B CN 102632599B CN 201210082836 A CN201210082836 A CN 201210082836A CN 102632599 B CN102632599 B CN 102632599B
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servo
driver
pressure
control
pressure sensor
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CN201210082836.1A
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CN102632599A (en
Inventor
杜宁
王飞
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NINGBO ONGREAT ELECTROMECHANICAL TECHNOLOGY Co Ltd
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NINGBO ONGREAT ELECTROMECHANICAL TECHNOLOGY Co Ltd
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Abstract

A kind of control system for shot machine, comprise: controller of plastic injection molding, servo-driver, servomotor, provides the quantitative oil pump of pressure to hydraulic system, pressure sensor, speed probe, wherein controller of plastic injection molding is connected with servo-driver, sends action command to servo-driver, set up digital communication agreement between controller of plastic injection molding and servo-driver, adopt digital communication mode to send action command to servo-driver; Controller of plastic injection molding has pressure controling signal, flow control signal and servo-driver response speed control signal to the information that servo-driver sends; Multiple pressure sensor, one end of each pressure sensor is connected with required test point, and the other end is directly connected with servo-driver, forms multiple pressure sensor signal feedback system; Pressure sensor and speed probe be directly connected with servo-driver realize pressure, flow regulates automatically.

Description

A kind of control system of injection machine
Technical field
The present invention relates to a kind of injection machine field, particularly relate to a kind of control system of injection machine.
Background technology
Carry out analog quantity communication between controller of plastic injection molding and servo-driver in prior art, indicated to the pressure of servo-driver distribution of machine action, flow by controller of plastic injection molding.According to the instruction that controller of plastic injection molding provides, servo-driver can only provide a fixing response speed.
But there is following shortcoming in prior art:
(1) controller of plastic injection molding sends analog signals to servo-drive and controls, because the instability of analog signals or be interfered easily, so easily cause the instability that injection machine runs, repeatable accuracy is poor.
(2) controller of plastic injection molding only has two kinds to the information that servo-driver sends: pressure controling signal and flow control signal, because not to the control signal of actuator response speed, so running in control at whole injection machine is all carry out running according to identical actuator response speed, pressure required for the everything of such injection machine, flow, all go to perform according to this response speed.But the response speed required for each action is not identical, this creates the terminal a problem, if that is: response speed tunes up, so when not needing the action of response fast to run, just easily produce hydraulic shock and motor vibrations, cause service life of a machine to be affected; If response speed slows down, the action that requirement ask for something can be caused again to respond fast can not accomplish good effect, reduces the performance of machine, wastes the highly-responsive of servo-drive system.
Summary of the invention
The object of the invention is the technical problem in order to solve existing for aforementioned injection machine, this application provides a kind of new control system for shot machine and control method.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of control system for shot machine, comprising:
Controller of plastic injection molding, servo-driver, servomotor, the quantitative oil pump of pressure is provided, pressure sensor, speed probe to hydraulic system, wherein controller of plastic injection molding is connected with servo-driver, send action command to servo-driver, servo-driver is connected with servomotor, controls motor rotation, motor is connected with oil pump, in order to drive oil pump to operate, pressure sensor is arranged on the oil circuit of needs detection, and speed probe is arranged in servomotor;
Described servo-driver comprises: pressure control module, for the pressure control values according to current working phase, when the force value of the pressure sensor collected and pressure control values have difference, regulates the output valve of pressure signal; Flow-control module, for the flow control value according to current working phase, when flow value corresponding to the rotating speed of the speed probe collected and flow control value have difference, the output valve of adjust flux signal; Torque drive unit, for being converted to torque control signal by pressure signal; Rotating speed driver element, for converting flow signal to tach signal;
Set up digital communication agreement between controller of plastic injection molding and servo-driver, adopt digital communication mode to send action command to servo-driver; Controller of plastic injection molding has pressure controling signal, flow control signal and servo-driver response speed control signal to the information that servo-driver sends; Multiple pressure sensor, one end of each pressure sensor is connected with required test point, and the other end is directly connected with servo-driver, forms multiple pressure sensor signal feedback system; Pressure sensor and speed probe be directly connected with servo-driver realize pressure, flow regulates automatically.
Described multiple pressure sensor, wherein has one for detecting pressure during injection, also has one in order to detect pressure during folding mould.
Described servomotor is permanent magnet synchronous servo motor.
Described motor does not select servomotor, selects stepper motor.
Described permanent magnet synchronous servo motor is connected with the direct axle of oil pump, oil pump adopts gear pump, and permanent magnet synchronous servo motor axle adopts internal spline, and gear pump shaft adopts external splines, described spline adopts the involute spline that the displacement number of teeth is 0.8, pressure angle is 20 °, and inside and outside spline directly connects.
A kind of method utilizing aforementioned described control system for shot machine to control injection machine injection and folding mould, comprise: controller of plastic injection molding is according to action of injection processing parameter setting value, by the digital communication agreement with servo-driver, action command is sent to servo-driver, i.e. flow, pressure and quick response instruction, servo-driver commands the rotating speed of servomotor according to the flow instruction received, the torque of servomotor is limited according to pressure instruction, according to the quick response instruction that action of injection needs, realize the height response of action of injection, high performance feature; Servo motor driven oil pump operates, export corresponding hydraulic fluid flow rate and pressure, enter in injection cylinder, promote injection mechanism and complete action of injection, in this course, the force value of actual oil is fed back to servo-driver by a pressure sensor, and servo-driver sends instruction according to the numerical value real-time operation correction of feedback, to ensure that actual act and demand for control are consistent, define injection closed-loop system;
When carrying out out mould assembling action, controller of plastic injection molding is according to opening mould assembling action processing parameter setting value, by the digital communication agreement with servo-driver, action command is sent to servo-driver, i.e. flow, pressure and medium speed's response instruction, servo-driver commands the rotating speed of servomotor according to the flow instruction received, the torque of servomotor is limited according to pressure instruction, according to the medium speed's response instruction opening mould assembling action needs, realize out the medium response speed of mould assembling action, stress the feature of stationarity; Servo motor driven oil pump operates; export corresponding hydraulic fluid flow rate and pressure; enter in folding mould oil cylinder; promote clasp mould mechanism and complete out mould assembling action; in this course, the force value of actual oil is fed back to servo-driver by another pressure sensor, and servo-driver sends instruction according to the numerical value real-time operation correction of feedback; to ensure that actual act and demand for control are consistent, achieve an independent folding mould closed-loop system different from injecting closed-loop control.
It is completely different from prior art that the present invention realizes the servo-controlled mode of digital substep, is mainly reflected in:
(1) communication modes.Traditional technology, be send voltage and current analog signals by controller of plastic injection molding to servo-driver, driver performs an action according to this signal; In the present invention, what communication adopted is send digital quantity signal by controller of plastic injection molding to servo-driver by communications protocol, and driver performs an action according to data signal, improves the Stability and veracity performed an action.
(2) response speed control data is added.Technology in the past, controller of plastic injection molding only has two kinds to the information that servo-driver sends: pressure controling signal and flow control signal; In the present invention, the information that controller of plastic injection molding sends to servo-driver not only has pressure controling signal and flow control signal, also add servo-driver response speed control signal, when injection machine does different action, the response speed requirement that servo-driver can provide according to controller of plastic injection molding or action response carry out the control to servomotor, achieve the object providing respective response speed to regulate for each point of action.This makes the ability of injection machine servo height response give full play to, and overall performance effectively improves, and run more steady, the complex optimums such as prolongation in service life improve effect.
Response speed controls can adopt known frequency converter to realize.Further, the present invention provides wherein a kind of concrete frequency converter connected mode.Namely controller of plastic injection molding control system is connected with frequency converter, and frequency converter is connected with servo-driver (frequency converter also can be built in servo-driver and directly be connected with motor), and servo-driver carrys out drive motors work.Motor is not quite identical in the running frequency pace of change of different process section, also the operation response speed that namely different process section requires is different, controller of plastic injection molding is according to different response speed requirements, (frequency converter can calculate corresponding frequency control signal value according to input control signal and motor shifts to an earlier date shifting time point to export response speed control signal, also by controller of plastic injection molding control signal can be converted into frequency control signal value in advance and motor shifts to an earlier date shifting time point, then send frequency converter to control) to the frequency converter be connected with servo-driver, transmit to servo-driver the running that the operation response speed control signal of motor controls motor by frequency converter, realize different speed responsive requirements, reach energy-conservation or the object in extension device service life.
(3) pressure closed loop feeds back signal to servo-driver.Servo-driver carries out calculation process according to this signal, the motion of adjustment motor, and the entirety achieving injection machine controls, and better completes injection machine overall operation and controls.
(4) multiple pressure signal acquisition processing system is added.In technology in the past, the signal of pressure sensor sends to servo-driver, servo-driver can only receive process pressure signal so control system can not expand the more high-precision multiple pressure sensor signal feedback processing system of realization, constrains the raising of injection machine performance.In the present invention, the signal of multiple pressure sensor can be sent to servo-driver, servo-driver can carry out calculation process according to each pressure sensor signal, reaches the accurate control to each pressure detecting point.Adopt the method for this patent, the servo-controlled precision of injection machine can be increased substantially, and provide basic controlling system for multi-functional expansion.
Accompanying drawing illustrates:
Fig. 1: machine Control system system schematic diagram of the present invention.
Description of reference numerals:
1-controller of plastic injection molding, 2-servo-driver, 3-servomotor, 4-oil pump, 5-pressure sensor (survey injection pressure), 6-pressure sensor (surveying folding molding pressure), 7-speed probe.
Detailed description of the invention
Below in conjunction with specific embodiment to invention has been further description.
Injection machine is by man-machine interface---and the instruction that controller of plastic injection molding carries out everything controls.Injection machine action control process is substantially identical, by injection, folding mould, eject, plastify, seat retreats and constitutes everything, wherein main actions is injection and folding mould, and these two actions have the greatest impact to machine performance.
As described in Figure 1, a kind of control system for shot machine, comprise controller of plastic injection molding 1, servo-driver 2, servomotor 3, the quantitative oil pump 4 of pressure is provided to hydraulic system, pressure sensor (5, 6), speed probe 7, wherein controller of plastic injection molding 1 is connected with servo-driver 2, action command is sent to servo-driver 2, servo-driver 2 is connected with servomotor 3, control motor 3 to operate, motor 3 is connected with oil pump 4, operate in order to drive oil pump 4, pressure sensor (5, 6) be arranged on the oil circuit needing to detect, speed probe 7 is arranged in servomotor 3, described servo-driver 2 comprises: pressure control module, for the pressure control values according to current working phase, when the force value of the pressure sensor collected and pressure control values have difference, regulates the output valve of pressure signal, flow-control module, for the flow control value according to current working phase, when flow value corresponding to the rotating speed of the speed probe collected and flow control value have difference, the output valve of adjust flux signal, torque drive unit, for being converted to torque control signal by pressure signal, rotating speed driver element, for converting flow signal to tach signal, set up digital communication agreement between controller of plastic injection molding 1 and servo-driver 2 1., adopt digital communication mode to send action command to servo-driver, the information that controller of plastic injection molding sends to servo-driver not only has pressure controling signal and flow control signal, also add servo-driver response speed control signal 3., multiple pressure sensor (5,6), one end of each pressure sensor is connected with required test point, and the other end is directly connected with servo-driver 2, forms multiple pressure sensor signal feedback system, pressure sensor (5,6) and speed probe 7 be directly connected with servo-driver 2 realize pressure, flow regulates automatically.
Further, described multiple pressure sensor (5,6), wherein have one for detecting injection time pressure 2., also have one in order to detect folding mould time pressure 4..
Further, it is that permanent-magnet synchronous private takes motor that described private takes motor.Particularly, described permanent-magnet synchronous private takes motor and is connected with the direct axle of oil pump, oil pump adopts gear pump, permanent-magnet synchronous private takes motor shaft and adopts internal spline, gear pump shaft adopts external splines, described spline adopts the involute spline that the displacement number of teeth is 0.8, pressure angle is 20 °, and inside and outside spline directly connects.Such connection better, more steadily.Above-mentioned axle connects also can adopt other forms of spline joint and gear connection etc.
Again further, described motor does not select servomotor, and selects stepper motor.
The operating process of concrete injection and folding mould is: controller of plastic injection molding 1 is according to action of injection processing parameter setting value, by the 1. agreement of the digital communication with servo-driver 2, action command is sent to servo-driver 2, i.e. voltage (flow), electric current (pressure) and quick response instruction are 3., servo-driver 2 commands the rotating speed of servomotor 3 according to the voltage received (flow) instruction, the torque of servomotor 3 is limited according to electric current (pressure) instruction, according to the quick response instruction that action of injection needs, realize the height response of action of injection, high performance feature.Servomotor 3 drives oil pump 4 to operate, export corresponding hydraulic fluid flow rate and pressure, enter in injection cylinder, promote injection mechanism and complete action of injection, in this course, 2. the force value of actual oil is fed back to servo-driver 2 by pressure sensor 5,5. the motor speed value (flow) of reality is fed back to servo-driver 2 by speed probe 7, servo-driver 2 sends instruction according to after the numerical value real-time operation correction of feedback, to ensure that actual act and demand for control are consistent, define injection closed-loop system.
When carrying out out mould assembling action, controller of plastic injection molding 1 is according to opening mould assembling action processing parameter setting value, by the 1. agreement of the digital communication with servo-driver, action command is sent to servo-driver 2, i.e. voltage (flow), electric current (pressure) and medium speed's response instruction are 3., servo-driver 2 commands the rotating speed of servomotor according to the voltage received (flow) instruction, the torque of servomotor 3 is limited according to electric current (pressure) instruction, according to the medium speed's response instruction opening mould assembling action needs, realize out the medium response speed of mould assembling action, stress the feature of stationarity.Servomotor 3 drives oil pump 4 to operate; export corresponding hydraulic fluid flow rate and pressure; enter in folding mould oil cylinder; promote clasp mould mechanism and complete out mould assembling action; in this course, 4. the force value of actual oil is fed back to servo-driver 2 by pressure sensor 6, and 5. the motor speed value of reality is fed back to servo-driver 2 by speed probe 7; servo-driver 2 sends instruction, to ensure that actual act and demand for control are consistent according to after the numerical value real-time operation correction of feedback.Achieve an independent folding mould closed-loop system different from injecting closed-loop control.
By carrying out the control 3. of friction speed response instruction to different action, in conjunction with attainable closed-loop system, effectively improve the performance of machine, stationarity and control accuracy.
Maximum bright spot of the present invention is:
(1) servo-driver adjusts action control speed according to response speed control signal, optimizes the overall operation of injection machine.
(2) decrease the interference of communication, improve data transmission credibility.
(3) achieve the overall closed loop of injection machine, improve the precision of motion control.
(4) multiple pressure signal acquisition process further increases the running precision of injector.
Certainly; the above is only one embodiment of the present invention; should be understood that those skilled in the art; under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications all belong within the protection domain of the claims in the present invention.

Claims (3)

1. the method utilizing control system for shot machine to control injection machine injection and folding mould, described control system for shot machine comprises: controller of plastic injection molding, servo-driver, servomotor, the quantitative oil pump of pressure is provided to hydraulic system, pressure sensor, speed probe, wherein controller of plastic injection molding is connected with servo-driver, action command is sent to servo-driver, servo-driver is connected with servomotor, control motor rotation, motor is connected with oil pump, operate in order to drive oil pump, pressure sensor is arranged on the oil circuit of needs detection, speed probe is arranged in servomotor,
Described servo-driver comprises: pressure control module, for the pressure control values according to current working phase, when the force value of the pressure sensor collected and pressure control values have difference, regulates the output valve of pressure signal; Flow-control module, for the flow control value according to current working phase, when flow value corresponding to the rotating speed of the speed probe collected and flow control value have difference, the output valve of adjust flux signal; Torque drive unit, for being converted to torque control signal by pressure signal; Rotating speed driver element, for converting flow signal to tach signal;
Set up digital communication agreement between controller of plastic injection molding and servo-driver, adopt digital communication mode to send action command to servo-driver; Controller of plastic injection molding has pressure controling signal, flow control signal and servo-driver response speed control signal to the information that servo-driver sends; Multiple pressure sensor, one end of each pressure sensor is connected with required test point, and the other end is directly connected with servo-driver, forms multiple pressure sensor signal feedback system; Pressure sensor and speed probe be directly connected with servo-driver realize pressure, flow regulates automatically; Described multiple pressure sensor, wherein has one for detecting pressure during injection, also has one in order to detect pressure during folding mould; Described servomotor is that permanent magnet synchronous servo motor concrete grammar comprises: controller of plastic injection molding is according to action of injection processing parameter setting value, by the digital communication agreement with servo-driver, action command is sent to servo-driver, i.e. flow, pressure and quick response instruction, servo-driver commands the rotating speed of servomotor according to the flow instruction received, the torque of servomotor is limited according to pressure instruction, according to the quick response instruction that action of injection needs, realize the height response of action of injection, high performance feature; Servo motor driven oil pump operates, export corresponding hydraulic fluid flow rate and pressure, enter in injection cylinder, promote injection mechanism and complete action of injection, in this course, the force value of actual oil is fed back to servo-driver by a pressure sensor, and servo-driver sends instruction according to the numerical value real-time operation correction of feedback, to ensure that actual act and demand for control are consistent, define injection closed-loop system;
When carrying out out mould assembling action, controller of plastic injection molding is according to opening mould assembling action processing parameter setting value, by the digital communication agreement with servo-driver, action command is sent to servo-driver, i.e. flow, pressure and medium speed's response instruction, servo-driver commands the rotating speed of servomotor according to the flow instruction received, the torque of servomotor is limited according to pressure instruction, according to the medium speed's response instruction opening mould assembling action needs, realize out the medium response speed of mould assembling action, stress the feature of stationarity; Servo motor driven oil pump operates; export corresponding hydraulic fluid flow rate and pressure; enter in folding mould oil cylinder; promote clasp mould mechanism and complete out mould assembling action; in this course, the force value of actual oil is fed back to servo-driver by another pressure sensor, and servo-driver sends instruction according to the numerical value real-time operation correction of feedback; to ensure that actual act and demand for control are consistent, achieve an independent folding mould closed-loop system different from injecting closed-loop control.
2. utilize control system for shot machine to control the method for injection machine injection and folding mould as claimed in claim 1, it is characterized in that: described motor does not select servomotor, selects stepper motor.
3. utilize control system for shot machine to control the method for injection machine injection and folding mould as claimed in claim 1, it is characterized in that: described permanent magnet synchronous servo motor is connected with the direct axle of oil pump, oil pump adopts gear pump, permanent magnet synchronous servo motor axle adopts internal spline, gear pump shaft adopts external splines, described spline adopts the involute spline that the displacement number of teeth is 0.8, pressure angle is 20 °, and inside and outside spline directly connects.
CN201210082836.1A 2012-03-27 2012-03-27 A kind of control system of injection machine Expired - Fee Related CN102632599B (en)

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CN102975345A (en) * 2012-12-01 2013-03-20 揭阳市顺嘉利塑胶实业有限公司 Power-saving control process for hot-working and forming of plastic
CN103009593B (en) * 2012-12-30 2015-04-08 宁波弘讯科技股份有限公司 Self-diagnostic system and method of injection molding machine
CN104476744B (en) * 2014-11-26 2018-02-02 上海工程技术大学 A kind of injection machine energy-saving servo-control system
CN106903853B (en) * 2015-10-27 2019-05-24 深圳市亚启科技有限公司 Control method and system for injection molding machine servo turntable
MX2018007123A (en) * 2015-12-14 2019-01-30 Imflux Inc Remote controller for controlling apparatus by diverting feedback signal from native controller to the remote controller and methods for same.
CN106738739A (en) * 2016-12-29 2017-05-31 宁波长飞亚塑料机械制造有限公司 A kind of control system and its method of electro-hydraulic mixed injection moulding machine

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