CN1597299A - Control device and mothod for raising injection moulding machine production efficiency based on energy-saving frequency change speed regulator - Google Patents
Control device and mothod for raising injection moulding machine production efficiency based on energy-saving frequency change speed regulator Download PDFInfo
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- CN1597299A CN1597299A CN 200410027770 CN200410027770A CN1597299A CN 1597299 A CN1597299 A CN 1597299A CN 200410027770 CN200410027770 CN 200410027770 CN 200410027770 A CN200410027770 A CN 200410027770A CN 1597299 A CN1597299 A CN 1597299A
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Abstract
A control device and method based on energy-saving frequency-varying speed regulator for increasing the productivity of injection moulding machine features that a lead time of motor acceleration for switching from one step to next step is given out by the frequency-varying device to eliminate the time delay.
Description
Technical field
The present invention relates to injection machine, a kind of effective energy-conservation control device and method of speed responsive realization time delay that is used under the prerequisite that does not reduce injection machine productivity ratio, eliminating each process section switching of injection machine that brings by frequency converter of saying so exactly.
Background technology
In traditional injection moulding industry, the normally used phase asynchronous alternating current generator of injection machine can not speed change, and the flow of its constant displacement pump that drags output hydraulic oil can not change, and injection machine is when carrying out the low speed action, unnecessary flow flows back to fuel tank through overflow valve, causes a large amount of losses of energy.
A kind of improved injection machine is to increase frequency converter on the basis of its existing equipment, to be suitable for the requirement of different production process for different frequency.Frequency converter can be regulated rotating speed of motor according to the instruction of control system, makes the flow of the hydraulic oil of constant displacement pump output require to change according to the injection machine responsiveness, has reduced hydraulic oil and has flowed back to the energy consumption of fuel tank from overflow valve, thereby saved a large amount of electric energy.
The running frequency that frequency converter is regulated motor by the flow and the pressure output current of sampling injection machine computer usually, but can produce the speed responsive delay that each process section of injection machine switches, prolong life cycle of the product, because after injection machine installs frequency converter additional, main motor speed changes along with the velocity variations of each process section of injection machine, circulation timei injection machine work period is shorter, the frequent switching of each process section causes frequent being in the acceleration and deceleration process of main motor, the motor acceleration and deceleration have certain response time, the booster response time that each process section switches is by the booster response time decision of motor, be generally the hundreds of millisecond, determine by the flow valve response time and install the booster response time that each process section switches before the frequency converter additional, be generally a few tens of milliseconds, the speed responsive time lengthening that causes each process section to switch, time injection machine production cycle is increased, and production efficiency reduces.
Summary of the invention
The object of the present invention is to provide a kind of control device and method of the raising injection machine production efficiency based on energy-conservation variable-frequency governor, before changing between each process section of injection machine production cycle by frequency converter, this control device and method provide the lead that a motor quickens, thereby eliminate the speed responsive time delay of between the injection machine process section, switching, a kind of reasonable power-economizing method of enhancing productivity is provided.
For achieving the above object, the present invention proposes a kind of control device of the raising injection machine production efficiency based on energy-conservation variable-frequency governor, comprise original injection machine and frequency converter, it is characterized in that being provided with control device between frequency converter and the injection machine, this control device can receive the technological parameter and the working state signal of injection machine, the frequency control signal value Fx and the motor that calculate frequency converter according to input signal shift to an earlier date acceleration time point Sx, the output frequency control signal is to the frequency converter that links to each other with the motor of injection machine, with the running speed of control motor; By the real-time control of this control device realization, and transmit control instruction exactly, the purpose of reach energy-conservation, enhancing productivity to frequency converter.
Described control device, it can be an one-way transmission to injection machine and frequency converter, applicable cases according to reality, also can be designed as transmitted in both directions, and its input/output port can be link to each other with the aanalogvoltage output interface of injection machine and frequency converter, can be to link to each other with injection machine analog current output interface, can be I/O action output interface, can be that serial communication interface links to each other, and also can be the combination of above-mentioned each interface.
Described technological parameter comprises the relevant pressure proportional signal of Shooting Technique, flow proportional signal with working state signal, and injection machine position, time, limit switch and present located process section sign; Described control device can be and Frequency Converter Control software constitutes an integral body, also can be the device of being made up of software and hardware that is independent of frequency converter.
The present invention realizes that above-mentioned purpose also comprises a kind of control method of the raising injection machine production efficiency based on energy-conservation variable-frequency governor, and its main step is:
Gather the technological parameter setting and the working state signal of injection machine;
The motor that changes next process section according to the current process section of importing of calculated signals injection machine shifts to an earlier date acceleration time point (Sx);
Frequency control signal is outputed to the frequency converter that links to each other with the injection machine motor;
It is characterized in that: frequency control signal comprises that motor shifts to an earlier date signal for faster.
The technological parameter setting of institute's collection injection machine comprises the relevant pressure of Shooting Technique, flow set parameter with working state signal, and injection machine position, time, limit switch and present located process section sign.
Described signal for faster in advance comprises acceleration time point and the control signal of acceleration time in advance in advance.
The motor that the current process section of injection machine changes next process section shifts to an earlier date acceleration time point (Sx) and is meant when changing between each process section of injection machine production cycle, when if next process section frequency is higher than current process section frequency, CPU is exported the time point of the frequency of next process section in advance in advance to frequency converter, acceleration time point (Sx) can use following formula to calculate in advance:
Sx＝Tx-TQx
Tx is the current process section time in the formula, and TQx is for shifting to an earlier date the acceleration time;
The acceleration time (TQx) in advance of motor is meant that motor needs to start in advance the time span of quickening, and its Calculation Method is as follows:
TQx＝(Ax*F
x+1-Bx*F
x)/(Cx*Fmax)*DT+T0
Wherein, Ax, Bx, Cx are the parameter that current process section is set in advance, and its span satisfies: Ax＞=0, Bx＞=0, Cx＞0; F
xBe current process section frequency control signal value, F
X+1Be next process section frequency control signal value, the control signal value (being generally mains frequency 50Hz) of the maximum operation frequency correspondence of motor when Fmax is injection machine use frequency converter, the calculating of frequency control signal value is identical with existing frequency converter, is not described in detail at this; DT is an empirical value, and span is 0～10s, and recommendation is that motor accelerates to the required time of maximum operation frequency by zero, and T0 is the experience setting value, and scope is 0～1s, the correction value of motor inertia size.
Describedly frequency control signal is outputed to the frequency converter that links to each other with the injection machine motor be meant motor the current process section frequency control signal value of output is to frequency converter before acceleration time point in advance that motor arrives the back at acceleration time point in advance and exports next process section frequency control signal value to frequency converter.
When switching between the process section, motor should be operated in the higher rotation speed operation that can satisfy the required flow of current working, from the process section of high rotating speed to slow-speed of revolution variation, do not need motor to quicken in advance for motor, it is zero that is to say the acceleration time in advance of motor and shifting to an earlier date the acceleration time point; From the process section of the slow-speed of revolution,, motor is quickened in advance for motor, avoid time delay, guarantee that whole injection cycle is constant according to the output frequency that promotes frequency converter the pre-set time that calculates to high rotation speed change.
Owing in the frequency converter reducing energy consumption of injection machine, use the present invention, realized the acceleration in advance of motor, eliminated the influence that the energy-conservation process of frequency converter descends to injection moulding production efficiency; Guarantee the required capability of fast response of Shooting Technique, using under the energy-conservation prerequisite of frequency converter, guaranteed the technological requirement and the production efficiency of injection moulding.
Description of drawings
Fig. 1 is a structural representation of the invention process,
Fig. 2 is the structural representation of another embodiment of the present invention,
Fig. 3 is a control flow chart of the invention process,
Fig. 4 is each process section switching controls flow chart of the invention process,
Fig. 5 is a critical piece connection layout of the invention process,
Fig. 6 is a time comparison diagram of the invention process.
The specific embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1, Fig. 2 are respectively two kinds of ways of realization of the present invention, it shown in the figure a kind of control device of the raising injection machine production efficiency based on energy-conservation variable-frequency governor, control device among the present invention is called signal acquisition and processing apparatus at this, this control device is used to receive the technological parameter and the working state signal of injection machine, the frequency control signal value Fx and the motor that calculate each process section frequency converter shift to an earlier date acceleration time point Sx, the output frequency control signal is to the frequency converter that links to each other with the motor of injection machine, with the running speed of control motor;
Control device can integrate with frequency converter, also can be arranged between frequency converter and the injection machine, Figure 1 shows that the present invention is integrated in signal acquisition and processing apparatus in the frequency converter, is formed into an integral body with frequency converter; Figure 2 shows that the hardware that is independent of frequency converter constitutes signal acquisition and processing apparatus.
The input/output port of this signal acquisition and processing apparatus can be link to each other with the aanalogvoltage output interface of injection machine, can be to link to each other with injection machine analog current output interface, it can be I/O action output interface, can be that serial communication interface links to each other, also can be the combination of above-mentioned various interface.Input signal can be the switching signal of pressure proportional signal, flow proportional signal, limit switch signal, each action output of injection machine and serial, parallel communications data, and detailed critical piece connects with reference to Fig. 5.
Structure shown in Figure 5 adopts serial communication interface exactly, and this interface transmission of digital signals can guarantee to transmit the accurate of signal, avoids unnecessary interference.All to signal acquisition and processing apparatus output, this signal acquisition and processing apparatus outputs to frequency converter with control signal to injection machine after handling calculating with locked mode, injection, thimble, pressure and flow signal, by the normal operation of Frequency Converter Control motor and acceleration in advance.
Therefore, for control device and method based on the raising injection machine production efficiency of energy-conservation variable-frequency governor, it mainly may further comprise the steps:
1, gathers the technological parameter setting and the working state signal of injection machine;
2, the motor that changes next process section according to the current process section of calculated signals injection machine of input shifts to an earlier date acceleration time point (Sx);
3, frequency control signal is outputed to the frequency converter that links to each other with the injection machine motor.
As for its concrete control flow as shown in Figure 3.
The relevant technological parameter and the working state signal of so-called collection control system for shot machine comprises the relevant pressure of Shooting Technique, flow set parameter, and injection machine position, time, limit switch and present located process section sign.Above-mentioned technological parameter is to be set by the operation interface of control system for shot machine, can comprise all signals, also can just adopt part signal.
Because the switching of each process section of injection machine adopts location point or time point to switch, adopting process section time that location point switches is that responsiveness along with this process section changes and changes, therefore, during the invention process each process section is provided with sign, by each process section sign is measured the working time that can calculate each process section, idiographic flow is seen Fig. 4.
The sign of process section is a special setting, such as signal is when adopting digital data transmission, and the sign of this process section is the Digital ID that is positioned at wave tail, perhaps adopts alternate manner also can.
Locked mode output signal that relevant technological parameter of gathering in embodiment illustrated in fig. 5 of control system for shot machine and working state signal mainly are injection machine and flow pressure scaling signal (the A part identifies).Determine the initial process section (being initial point) of the production cycle of injection machine according to the locked mode output signal; Change the time of technology hop count He each process section of measuring injection machine according to the flow pressure scaling signal, and mark the sign of each process section.
Wherein, A part and B part in the control flow can be connected, and form total control flow.
Topmost control step is in the control flow: elder generation judges that whether current process section frequency control signal value is less than next process section frequency control signal value before calculating motor to shift to an earlier date the acceleration time point, when greater than next process section frequency control signal value, acceleration time puts and is the concluding time of current process section time in advance, and promptly the acceleration time is zero in advance; When less than next process section frequency control signal, shift to an earlier date being calculated as follows of acceleration time point (Sx):
Sx＝Tx-TQx
Tx is the current process section time in the formula, and TQx shifts to an earlier date the acceleration time,
Motor shift to an earlier date the acceleration time (TQx) method as shown in the formula:
TQx＝(Ax*F
x+1-Bx*F
x)/(Cx*Fmax)*DT+T0
Wherein, Ax, Bx, Cx are the parameter that current process section is set in advance, and its span satisfies: Ax＞=0, Bx＞=0, Cx＞0; F
xBe current process section frequency control signal value, F
X+1Be next process section frequency control signal value, the control signal value (being generally mains frequency 50Hz) of the maximum operation frequency correspondence of motor when Fmax is injection machine use frequency converter, the calculating of frequency control signal value is identical with existing frequency converter, is not described in detail at this; DT is an empirical value, and span is 0～10s, and recommendation is that motor accelerates to the required time of maximum operation frequency by zero, and T0 is the experience setting value, and scope is 0～1s, the correction value of motor inertia size.
Calculating motor (TQx)=(Ax*F that shifts to an earlier date the acceleration time
X+1-Bx*F
xAmong the * of)/(Cx*Fmax) DT+T0, as (Ax*F
X+1-Bx*F
xDuring the * of)/(Cx*Fmax) DT=0, TQx=T0, the motor of each process section shift to an earlier date the acceleration time and are changed to certain value, are special cases of this formula, and this computational methods are comparatively easy.
Through actual tests and detection, frequency converter according to the signal acquisition and processing apparatus that the present invention implemented, when injection machine changes the injection process section at the high-voltage lock mould process section, the flow value of high-voltage lock mould process section is set at 20%, the location point that changes high-voltage lock mould is 60mm, the high-voltage lock mould process section time T of measuring according to the flow value and the location point of high-voltage lock mould 1; It is 85% that injection process section parameter is set flow; Corresponding to the injection process section frequency control signal value F2 of the flow frequency control signal value F1 greater than the high-voltage lock mould process section, the motor that the high-voltage lock mould process section changes the injection process section shifts to an earlier date the acceleration time, and (TQ1) calculated by following formula:
TQ1＝(A1*F
2-B1*F
1)/(C1*Fmax)*DT+T0
This example is got A1=1, B1=1, and C1=1, acceleration time DT value is 0.5s, the correction value T0 value of motor inertia size is 0s.
The calculating motor shifts to an earlier date acceleration time point (S1) and is calculated by following formula: S1=T1-TQ1
When shifting to an earlier date acceleration time point (S1), the no show of high-voltage lock mould process section, after the arrival of high-voltage lock mould process section shifts to an earlier date acceleration time point (S1), exports the motor running frequency control signal F2 of injection process section correspondence to frequency converter to the motor running frequency control signal F1 of frequency converter output high-voltage lock mould process section correspondence.
Before changing between each process section of injection machine production cycle by frequency converter, this signals collecting control device and method provide the lead that a motor quickens, thereby eliminate the speed responsive time delay of between the injection machine process section, switching, a kind of reasonable power-economizing method of enhancing productivity is provided.
Fig. 6 is that this example does not add frequency converter, installs frequency converter additional and installs the comparison that the high-voltage lock mould process section that adopts frequency converter of the present invention changes injection process section motor speed and responsiveness curve additional.Do not use injection machine when work motor of frequency converter to be in the operation of power frequency state, the speed responsive of locked mode process section depends on the proportioning valve response of fuel tap always, and the response time ignores than I; The injection machine that uses frequency converter is when the high-voltage lock mould process section changes the injection process section, because the speed responsive of motor has certain lag time, makes that responsiveness had one section to quicken time delay when the injection process section began, and makes injection process section time lengthening.And after using control system for shot machine of the present invention, injection machine has been exported one to frequency converter and has been shifted to an earlier date the acceleration time before the high-voltage lock mould process section changes the injection process section, motor speed has reached the desired rotating speed of injection process section when process section switches, the speed responsive of injection process section is consistent with the situation of not using frequency converter, thereby has reached purpose of energy saving under the prerequisite that does not reduce production efficiency.
As on injection machine, installing additional in the 37KW Inverter Application, when not adopting the method and apparatus that the present invention implements, the injection machine energy-saving that has installed frequency converter additional reaches 35%, but the work period extends to 32S by the 29s that does not install additional before the frequency converter, production cycle has prolonged about 10%, and actual fractional energy savings only is 31%.When adopting configuration the method for the invention and device, as setup parameter be: T0=0.2S, F0=10Hz, Fmax=50Hz, Fmin=20Hz, DT=0.5S, the production cycle of having installed the injection machine of frequency converter additional still is 29s, energy-conservation is 35%, through long-play, product meets technological requirement, has realized purpose of energy saving under the prerequisite that production efficiency does not reduce.
More than description is the detailed description to several specific embodiment of the present invention, does not limit implementation content of the present invention for this reason, and every employing control device described in the invention and control method all within protection scope of the present invention.
Claims (8)
1, a kind of control device of the raising injection machine production efficiency based on energy-conservation variable-frequency governor, comprise original injection machine and frequency converter, it is characterized in that this control device receives the technological parameter and the working state signal of injection machine, the frequency control signal value Fx and the motor that calculate frequency converter according to input signal shift to an earlier date acceleration time point Sx, and the output frequency control signal is to the frequency converter that links to each other with the motor of injection machine.
2, the control device of the raising injection machine production efficiency based on energy-conservation variable-frequency governor according to claim 1, it is characterized in that its input/output port links to each other with the aanalogvoltage output interface of injection machine and frequency converter, analog current output interface, I/O action output interface, serial communication interface any one or arbitrarily combination link to each other.
3, the control device of the raising injection machine production efficiency based on energy-conservation variable-frequency governor according to claim 1, it is characterized in that described control device can be to be integrated in one with frequency converter, also can be the device of being made up of software and hardware that is independent of frequency converter.
4, a kind of control method of the raising injection machine production efficiency based on energy-conservation variable-frequency governor, its main step is:
Gather the technological parameter setting and the working state signal of injection machine;
The motor that changes next process section according to the current process section of importing of calculated signals injection machine shifts to an earlier date acceleration time point (Sx);
Frequency control signal is outputed to the frequency converter that links to each other with the injection machine motor;
It is characterized in that: frequency control signal comprises that motor shifts to an earlier date signal for faster.
5, the control method of the raising injection machine production efficiency based on energy-conservation variable-frequency governor according to claim 4, the technological parameter setting that it is characterized in that institute's collection injection machine comprises the relevant pressure of Shooting Technique, flow set parameter with working state signal, and any one or its combination of injection machine position, time, limit switch and present located process section sign.
6, the control method of the raising injection machine production efficiency based on energy-conservation variable-frequency governor according to claim 4 is characterized in that described signal for faster in advance comprises acceleration time point and the control signal of acceleration time in advance in advance.
7, the control method of the raising injection machine production efficiency based on energy-conservation variable-frequency governor according to claim 6, it is characterized in that motor that the current process section of injection machine changes next process section shifts to an earlier date acceleration time point (Sx) and is meant when changing between each process section of injection machine production cycle, when if next process section frequency is higher than current process section frequency, CPU is exported the time point of the frequency of next process section in advance in advance to frequency converter, acceleration time point (Sx) can use following formula to calculate in advance:
Sx＝Tx-TQx
Tx is the current process section time in the formula, and TQx is for shifting to an earlier date the acceleration time;
The acceleration time (TQx) in advance of motor is meant that motor needs to start in advance the time span of quickening, and its Calculation Method is as follows:
TQx＝(Ax*F
x+1-Bx*F
x)/(Cx*Fmax)*DT+T0
Wherein, Ax, Bx, Cx are the parameter that current process section is set in advance, and its span satisfies: Ax＞=0, Bx＞=0, Cx＞0; Fx is current process section frequency control signal value, Fx+1 is next process section frequency control signal value, the control signal value (being generally mains frequency 50Hz) of the maximum operation frequency correspondence of motor when Fmax is injection machine use frequency converter, the calculating of frequency control signal value is identical with existing frequency converter, is not described in detail at this; DT is an empirical value, and span is 0～10s, and recommendation is that motor accelerates to the required time of maximum operation frequency by zero, and T0 is the experience setting value, and scope is 0～1s, the correction value of motor inertia size.
8, the control method of the raising injection machine production efficiency based on energy-conservation variable-frequency governor according to claim 4, it is characterized in that describedly frequency control signal is outputed to the frequency converter that links to each other with the injection machine motor being meant motor the current process section frequency control signal value of output being to frequency converter before acceleration time point in advance that motor arrives the back at acceleration time point in advance and exports next process section frequency control signal value to frequency converter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100277701A CN100372669C (en) | 2004-06-24 | 2004-06-24 | Control device and mothod for raising injection moulding machine production efficiency based on energy-saving frequency change speed regulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100277701A CN100372669C (en) | 2004-06-24 | 2004-06-24 | Control device and mothod for raising injection moulding machine production efficiency based on energy-saving frequency change speed regulator |
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| Publication Number | Publication Date |
|---|---|
| CN1597299A true CN1597299A (en) | 2005-03-23 |
| CN100372669C CN100372669C (en) | 2008-03-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109002020A (en) * | 2018-07-26 | 2018-12-14 | 广东工业大学 | A kind of injection molding machine management simulation method, apparatus and computer readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295912A (en) * | 2000-10-18 | 2001-05-23 | 深圳市华为电气技术有限公司 | Injection machine energy-saving device and method based on frequency-converting speed regulator |
| CN1137812C (en) * | 2000-10-18 | 2004-02-11 | 艾默生网络能源有限公司 | Injection machine energy-saving equipment based on frequency conversion speed controller and its method |
| CN1159146C (en) * | 2002-11-15 | 2004-07-28 | 宁波海天股份有限公司 | Energy saving device of frequency change injection moulding machine and its energy saving method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109002020A (en) * | 2018-07-26 | 2018-12-14 | 广东工业大学 | A kind of injection molding machine management simulation method, apparatus and computer readable storage medium |
| CN109002020B (en) * | 2018-07-26 | 2021-03-30 | 广东工业大学 | Injection molding machine management simulation method and device and computer readable storage medium |
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| CN100372669C (en) | 2008-03-05 |
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Assignee: Zhuhai Zhongfu bottle Co. Ltd. Assignor: Shenzhen Shanxing Computer Co., Ltd. Contract record no.: 2010440001039 Denomination of invention: Control device and mothod for raising injection moulding machine production efficiency based on energy-saving frequency change speed regulator Granted publication date: 20080305 License type: Exclusive License Open date: 20050323 Record date: 20100728 |
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Granted publication date: 20080305 Termination date: 20110624 |