CN201950794U - Molten glue backpressure control system of electric control injection molding machine - Google Patents
Molten glue backpressure control system of electric control injection molding machine Download PDFInfo
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- CN201950794U CN201950794U CN2011200638813U CN201120063881U CN201950794U CN 201950794 U CN201950794 U CN 201950794U CN 2011200638813 U CN2011200638813 U CN 2011200638813U CN 201120063881 U CN201120063881 U CN 201120063881U CN 201950794 U CN201950794 U CN 201950794U
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- back pressure
- injection
- automatically controlled
- control system
- glue back
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Abstract
The utility model relates to a molten glue backpressure control system of an electric control injection molding machine, which comprises an embedded controller and a pressure sensor, wherein the pressure sensor is arranged in a glue injection port so as to acquire molten glue backpressure signals; the embedded controller is used for comparing the received molten glue backpressure signals with a preset molten glue backpressure value so as to obtain real-time error signals, and carrying out proportional integral operation so as to control the rotation speed of a glue injection motor, so that the disadvantages that conventional molten glue backpressure control has a plurality of intermediate links and quite low precision are prevented; because proportional integral control is adopted, closed loop control calculation is directly carried out to the molten glue backpressure acquired by the pressure sensor and the preset molten glue backpressure value, so that the constant glue injection pressure can be maintained; not only is the structure simple but also parameters are easy to adjust, not only is the dynamic response speed ensured but also static errors are eliminated, so that the error degree of the system is improved, the functions of real-time pressure control and precise pressure control are realized, and the product quality is greatly improved.
Description
Technical field
The utility model relates to the smelting glue back pressure control system, more particularly, relates to a kind of smelting glue back pressure control system of automatically controlled injection machine.
Background technology
Injection screw is when preformed, and the pressure of melt is called smelting glue back pressure in the barrel that is calculated.During injection machine work, suitable smelting glue back pressure makes it obtain good balance between melt quality and production efficiency, be one of important parameter of controlling in the injection molding process melt quality and product quality, suitable stable smelting glue back pressure plays an important role for the quality that improves injecting products.
Present most injection machine all is as power source with hydraulic oil pump, the control object of smelting glue back pressure is the oil circuit back pressure in the storing process, the injection cylinder rear portion all is provided with counterbalance valve, so the control of smelting glue back pressure is to realize by the counterbalance valve of regulating injection cylinder.But concerning automatically controlled injection machine, the control of smelting glue back pressure is more complicated but, and smelting glue back pressure is controlled jointly by the speed of gyration of melten gel rotating speed of motor and injection motor during the screw rod rotation.Under the constant situation of the rotary speed of melten gel motor, the numerical value of the speed of gyration of injection motor is the function of smelting glue back pressure, and promptly the numerical value of the speed of gyration of injection motor is big more, and smelting glue back pressure is just more little, the speed of gyration numerical value of injection motor is more little, and smelting glue back pressure is big more.
At present the effect that obtains at the closed loop research of control in real time of the smelting glue back pressure of automatically controlled injection machine is little.The oil circuit back pressure control of traditional injection moulding machine is controlled the pressure of injection cylinder, and pressure controling precision is lower, can not directly realize the Detection ﹠ Controling to smelting glue back pressure, thereby can not guarantee the high-precision requirement of goods.
The utility model content
The technical problems to be solved in the utility model is, at the above-mentioned defective of prior art, provides a kind of smelting glue back pressure control system of automatically controlled injection machine.
The technical scheme that its technical problem that solves the utility model adopts is: the smelting glue back pressure control system of constructing a kind of automatically controlled injection machine, described automatically controlled injection machine comprises injection screw, be used to drive the reciprocating injection motor of described injection screw and be used to drive the melten gel motor that described injection screw rotatablely moves, described melten gel rotating speed of motor is constant, described smelting glue back pressure control system comprises embedded controller and is used to gather the pressure sensor of smelting glue back pressure signal, wherein, described pressure sensor is arranged on the injection molding mouth of described automatically controlled injection machine, described embedded controller respectively with the injection motor, melten gel motor and pressure sensor are electrically connected.
In the smelting glue back pressure control system of automatically controlled injection machine described in the utility model, in described embedded controller, be provided with pi controller 211.
In the smelting glue back pressure control system of automatically controlled injection machine described in the utility model, between described injection motor and injection screw, be provided with drive disk assembly, wherein, described injection motor is electrically connected with described drive disk assembly, and described drive disk assembly and described injection screw are in transmission connection.
In the smelting glue back pressure control system of automatically controlled injection machine described in the utility model, between described embedded controller and injection motor, be provided with servo-driver; Described embedded controller is electrically connected with described servo-driver, and described servo-driver is electrically connected with described injection motor.
In the smelting glue back pressure control system of automatically controlled injection machine described in the utility model, described embedded controller also is electrically connected with the input equipment of described automatically controlled injection machine.
In the smelting glue back pressure control system of automatically controlled injection machine described in the utility model, described input equipment is a touch panel.
In the smelting glue back pressure control system of automatically controlled injection machine described in the utility model, between described embedded controller and melten gel motor, be provided with frequency converter; Described embedded controller is electrically connected with described frequency converter, and described frequency converter is electrically connected with described melten gel motor.
Implement the smelting glue back pressure control system of automatically controlled injection machine of the present utility model, have following beneficial effect: directly detect smelting glue back pressure at injection molding mouth by pressure sensor, it is many to have avoided conventional smelting glue back pressure to control intermediate link, the shortcoming that precision is lower; Owing to adopt proportional plus integral control, directly the smelting glue back pressure to the pressure sensor collection carries out closed-loop control calculating with default smelting glue back pressure value, according to the speed of gyration of result of calculation control injection motor, thereby can keep the constant of injection pressure, not only simple in structure, parameter also is easy to adjust, both guarantee dynamic responding speed, eliminated static error again, thereby improved the degree of error of system, have the function of real-time pressure control, accurate pressure control, improved quality of item greatly.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation of the automatically controlled injection machine of the utility model;
Fig. 2 is the theory diagram of the smelting glue back pressure control system of the automatically controlled injection machine of the utility model;
Fig. 3 is the flow chart of the smelting glue back pressure control method of the automatically controlled injection machine of the utility model;
Fig. 4 is the smelting glue back pressure time history plot.
The specific embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As illustrated in fig. 1 and 2, the smelting glue back pressure control system of automatically controlled injection machine of the present utility model mainly is to be used for the smelting glue back pressure of automatically controlled injection machine is carried out dynamic real-time control.Understandable this smelting glue back pressure control system 2 both can be the part of automatically controlled injection machine, also can be as required with this smelting glue back pressure control system 2 as a device that is independent of automatically controlled injection machine 1, do not do further qualification at this.
As illustrated in fig. 1 and 2, this automatically controlled injection machine 1 comprises input equipment 11, servo-driver 12, injection motor 13, drive disk assembly 14, frequency converter 15, melten gel motor 16 and injection screw 17; Wherein servo-driver 12 is electrically connected with injection motor 13, injection motor 13 is electrically connected with drive disk assembly 14, frequency converter 15 is electrically connected with melten gel motor 16, melten gel motor 16 and drive disk assembly 14 all are in transmission connection with injection screw 17, move back and forth thereby drive injection screw 17, and rotatablely move by melten gel motor 16 drive injection screws 17 by drive disk assembly 14.When specific design, this drive disk assembly 14 can be made of synchronous band and ball-screw, and the repeatable accuracy error can be less than 0.01%.Smelting glue back pressure control system 2 mainly comprises embedded controller 21 and pressure sensor 22, and wherein, embedded controller 21 is electrically connected with input equipment 11, servo-driver 12, frequency converter 15 and pressure sensor 22 respectively.Should be noted that the annexation between each equipment is the needs of explaining its information interaction and control procedure for clear in all diagrams of the utility model, therefore should be considered as annexation in logic, and should not only limit to physical connection.
When concrete work, pressure sensor 22 is installed in the injection molding mouth of automatically controlled injection machine 1 and directly the smelting glue back pressure signal is gathered, and the smelting glue back pressure signal that collects is carried out A/D conversion back carry out the closed-loop control computing with default smelting glue back pressure value.Smelting glue back pressure control system 2 with the embedded controller 21 of high-speed response as core parts, and through serial paralled interface transmission data, on man-machine interface, data are carried out the real-time curve monitoring, shorten the response time of whole system, improved the control accuracy of key parameters such as the position in the injection moulding process, speed.
By the input equipment 11 of automatically controlled injection machine 1, understandable, this input equipment 11 can be the device that touch panel or touch-screen etc. have input/output function simultaneously.When this input equipment 11 is touch-screen, on this touch-screen, set the default smelting glue back pressure value and the process parameter value in each stage of injection moulding, for example, the pressure in each stage of injection moulding, speed and location parameter value.Simultaneously relevant numerical value is sent in the embedded controller 21 of smelting glue back pressure control system 2.In addition, high-precision pressure sensor 22 detected smelting glue back pressure signals can directly send to embedded controller 21, also a signal pickup assembly can be set again, thereby send to this signal pickup assembly earlier, further send to embedded controller 21 again.At embedded controller 21 smelting glue back pressure signal and the default smelting glue back pressure value that obtains compared, obtain deviation signal, again deviation signal is carried out proportional integral calculating and prevented the saturated qualification of integration and filtering calculating, at last result of calculation is converted to issuing velocity and penetrate moment of torsion, signal after embedded controller 21 will be changed sends servo-driver 12, by the speed of gyration of servo-driver 12 control injection motors 13, to realize the accurate control of smelting glue back pressure in the injection moulding process.
The maximum position deviation s of traditional employing PLC controller
MaxFor:
s
max＝Δt×v＝4.5mm
Wherein: Δ t is interval detection time, and the response time of conventional P LC controller is about 15ms; V is an injection moulding speed, and the injection speed of automatically controlled adapted to injection system injection machine is 0.3m/s.
Adopt this embedded controller 21, its response time is 1ms, then Zui Da position deviation s '
MaxFor:
s′
max＝Δt′×v＝0.3mm。
This shows, greatly reduce the position of 2 pairs of automatically controlled injection machines 1 of smelting glue back pressure control system, the error that speed control causes.This smelting glue back pressure control system 2 can realize the real-time accurate closed-loop control to smelting glue back pressure, has also guaranteed position and velocity control accuracy simultaneously, and antijamming capability is strong.
This smelting glue back pressure control system 2 is applied on the automatically controlled injection machine 1, and test comparative study in a large number, adopts pressure sensor is directly gathered the smelting glue back pressure of injection molding mouth, back pressure is controlled than being equivalent to the traditional injection moulding machine by control injection cylinder pressure and realizing owing to there is area ± the 2.0bar precision, Products Quality is good, improved pressure controling precision greatly, be a kind of at automatically controlled injection machine in real time, smelting glue back pressure closed-loop control system efficiently.
The flow process of the smelting glue back pressure control method of automatically controlled injection machine as shown in Figure 3 specifically may further comprise the steps:
S301: pressure sensor 22 directly carries out data acquisition at the injection molding mouth of automatically controlled injection machine 1 to smelting glue back pressure;
S302: the smelting glue back pressure signal that collects is carried out the A/D analog-to-digital conversion;
S303: will carry out shaping filter through the smelting glue back pressure signal after the A/D analog-to-digital conversion;
S304: data behind the shaping filter and the smelting glue back pressure value of presetting are compared, obtain real-time deviation signal, this deviation signal is carried out the discrete ratios integral operation; By deviation signal is carried out the proportional integral computing, calculate link in ratio thus and reflect the deviation signal that smelting glue back pressure control system 2 is obtained in real time, in case deviation produces, this proportional integral computing just produces control action, in time reduce its influence, guarantee its dynamic property whole automatically controlled injection machine 1.Integral element is used for improving the static accuracy of proportional integral computing FEEDBACK CONTROL during slowly changing;
S305: prevent the integration saturation arithmetic in the integral operation link;
S306: the result to anti-saturation arithmetic carries out the amplitude limit adjustment;
S307: adjusted result exports filtering to amplitude limit;
By step S305, S306 and S307, integral element is prevented saturated qualification of integration and filtering operation, mainly be in order to prevent the integration control link because the saturated system's control that brings of the integration that the growth of time causes is untimely, out of control and unstable, introduce the anti-saturated calculating of integration, realized the real-time control of pressure and the reaction flexibility of system's long-time running.Adopt filtering operation to weaken of the influence of interfering signals such as environmental noise, board vibration, power supply simultaneously, obtain accurate control signal as far as possible control system.
S308: will convert issuing velocity to and penetrate torque signal through exporting filtered result at last, the signal after will changing be at last exported to servo-driver 12, thereby the speed of gyration of injection motor is controlled, and accurately controls the motion of executing agency thus.
When concrete calculating, the computing formula of proportional integral computing is as follows:
Wherein: the difference of e (n)-setting back pressure and the n time collection pressure signal deducts system deviation;
K
P-proportionality coefficient;
K
I-integral coefficient.
As shown in Figure 4, in an injection cycle, the smelting glue back pressure-time plot that obtains, wherein, the control accuracy of smelting glue back pressure can reach ± 2.0bar, and Products Quality is good.Experimental result shows: the utility model can be realized the accurate control of pressure, is a kind of control method of real-time high-efficiency of the smelting glue back pressure control system at automatically controlled injection machine.
The utility model describes by several specific embodiments, it will be appreciated by those skilled in the art that, under the situation that does not break away from the utility model scope, can also carry out various conversion and be equal to alternative the utility model.In addition, at particular condition or concrete condition, can make various modifications to the utility model, and not break away from scope of the present utility model.Therefore, the utility model is not limited to disclosed specific embodiment, and should comprise the whole embodiments that fall in the utility model claim scope.
Claims (7)
1. the smelting glue back pressure control system of an automatically controlled injection machine, described automatically controlled injection machine comprises injection screw, be used to drive the reciprocating injection motor of described injection screw and be used to drive the melten gel motor that described injection screw rotatablely moves, it is characterized in that, described melten gel rotating speed of motor is constant, described smelting glue back pressure control system comprises embedded controller and is used to gather the pressure sensor of smelting glue back pressure signal, wherein, described pressure sensor is arranged on the injection molding mouth of described automatically controlled injection machine, described embedded controller respectively with the injection motor, melten gel motor and pressure sensor are electrically connected.
2. the smelting glue back pressure control system of automatically controlled injection machine according to claim 1 is characterized in that, is provided with pi controller in described embedded controller.
3. the smelting glue back pressure control system of automatically controlled injection machine according to claim 2, it is characterized in that, between described injection motor and injection screw, be provided with drive disk assembly, wherein, described injection motor is electrically connected with described drive disk assembly, and described drive disk assembly and described injection screw are in transmission connection.
4. the smelting glue back pressure control system of automatically controlled injection machine according to claim 1 is characterized in that, is provided with servo-driver between described embedded controller and injection motor; Described embedded controller is electrically connected with described servo-driver, and described servo-driver is electrically connected with described injection motor.
5. the smelting glue back pressure control system of automatically controlled injection machine according to claim 1 is characterized in that, described embedded controller also is electrically connected with the input equipment of described automatically controlled injection machine.
6. the smelting glue back pressure control system of automatically controlled injection machine according to claim 5 is characterized in that, described input equipment is a touch panel.
7. the smelting glue back pressure control system of automatically controlled injection machine according to claim 1 is characterized in that, is provided with frequency converter between described embedded controller and melten gel motor; Described embedded controller is electrically connected with described frequency converter, and described frequency converter is electrically connected with described melten gel motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200638813U CN201950794U (en) | 2011-03-11 | 2011-03-11 | Molten glue backpressure control system of electric control injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200638813U CN201950794U (en) | 2011-03-11 | 2011-03-11 | Molten glue backpressure control system of electric control injection molding machine |
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| Publication Number | Publication Date |
|---|---|
| CN201950794U true CN201950794U (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200638813U Expired - Lifetime CN201950794U (en) | 2011-03-11 | 2011-03-11 | Molten glue backpressure control system of electric control injection molding machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114311575A (en) * | 2021-12-30 | 2022-04-12 | 阿托斯(上海)液压有限公司 | Injection molding machine backpressure control device and method based on double closed-loop PID regulation |
-
2011
- 2011-03-11 CN CN2011200638813U patent/CN201950794U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114311575A (en) * | 2021-12-30 | 2022-04-12 | 阿托斯(上海)液压有限公司 | Injection molding machine backpressure control device and method based on double closed-loop PID regulation |
| CN114311575B (en) * | 2021-12-30 | 2024-03-29 | 阿托斯(上海)液压有限公司 | Injection molding machine back pressure control device and method based on double closed-loop PID regulation |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110831 |