CN1152775C - Feedback type control method for energy-saving operation of injection molding machine - Google Patents
Feedback type control method for energy-saving operation of injection molding machine Download PDFInfo
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- CN1152775C CN1152775C CNB021112916A CN02111291A CN1152775C CN 1152775 C CN1152775 C CN 1152775C CN B021112916 A CNB021112916 A CN B021112916A CN 02111291 A CN02111291 A CN 02111291A CN 1152775 C CN1152775 C CN 1152775C
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000001746 injection moulding Methods 0.000 title claims abstract description 14
- 238000002347 injection Methods 0.000 claims description 23
- 239000007924 injection Substances 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 10
- 230000004044 response Effects 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
A feedback control method for the energy-saving operation of injection moulding machine with frequency converter features that the signals of electromagnetic valves and proportional regulating valves in injection moulding machine are synchronously collected to judge the current running state of injection moulding machine, so the frequency converter outputs relative frequency value to control the rotation speed of motor. The invention has the advantages of more convenient and easy implementation; the universality is stronger; the system has high dynamic response speed, and can also stop the motor to rotate according to the requirements of working conditions so as to save energy to the maximum extent.
Description
Technical field
The present invention relates to a kind of power-economizing method of injection machine, especially refer to have the control method of energy-saving run of the injection machine of frequency converter.
Background technology
The motor of existing common injection machine is direct and power frequency supply joins, capacity motor is selected according to the required maximum stream flow of operating mode in the hydraulic system, so in whole process of production, the driven by motor hydraulic pump is stably exported the required maximum stream flow of operating mode, but in actual production, each working cycles of injection machine, the required flow of each operating mode is different, therefore when low flow rate condition, additional flow just returns through proportional flow control valve throttling and proportional pressure valve overflow in the ratio adjusting valve, and this has just caused the lot of energy waste.In order to reduce waste, people adopt the Frequency Converter Control motor, and motor is operated under the corresponding rotating speed, and the flow that makes oil pump output be adapted to require reaches energy-conservation purpose, and problem just is summed up as suitably instruction of frequency converter output like this, makes machine operation at corresponding rotating speed.Various schemes are arranged for this reason, it as application number 00132886.7 Chinese invention patent application " injection machine energy-saving frequency converter and power-economizing method ", this scheme is gone here and there between motor and power frequency supply common frequency converter, increase a signal processing apparatus with software or hardware mode then, this device receives the technological parameter setting and the working state signal of injection machine, calculate the frequency values of frequency converter, and output to the frequency of motor with this frequency values control frequency converter.Though this invention can suitably reduce the running speed of motor under non-extreme case, reach saves energy.Yet adopt the computational methods of the linear combination of flow valve signal and pressure valve signal in this scheme, in concrete enforcement, certain degree of difficulty is being arranged, moreover, when flow required in the hydraulic system and pressure are zero, motor is still rotating, and does not reach abundant purpose of energy saving this moment.
Summary of the invention
First technical problem to be solved by this invention is to overcome above-mentioned defective, and a kind of easy enforcement is provided, to a greater extent the energy-saving running of injection moulding machine feedback-type control method of conserve energy.
Second technical problem to be solved by this invention is to overcome above-mentioned defective, and a kind of easy enforcement is provided, to a greater extent conserve energy and make the fast energy-saving running of injection moulding machine feedback-type control method of response speed of system.
The present invention solves the technical scheme that above-mentioned first technical problem adopts: the feedback-type control method of this energy-saving running of injection moulding machine comprises following process: the voltage signal V that 1. gathers each magnetic valve in the injection machine at first synchronously
iAnd the proportional pressure valve current signal I in the ratio adjusting valve
pWith proportional flow control valve current signal I
f2. according to above-mentioned magnetic valve voltage signal V
iJudge that current injection machine has or not work, if each magnetic valve voltage signal V
iWhen all being zero, then frequency converter output zero rotary speed instruction stops operating motor fully, and changes for the 1. step over to; If each magnetic valve voltage signal V
iHave at least one non-vanishing, then changed for the 3. step over to; 3. according to the current signal I of aforementioned proportion flow valve
fDetermine corresponding frequency converter the frequency F that should export
f4. according to the current signal I of aforementioned proportion pressure valve
pCome to determine corresponding system pressure P, and pressure P is determined the minimum F of the output frequency of corresponding frequency converter thus
Min(P); 5. judge F again
fWith F
Min(P) size, and with the output order of big person as frequency converter makes motor with more than or equal to F
fAnd F
Min(P) rotating speed operation.
The present invention solves above-mentioned second technical scheme that technical problem adopted: the feedback-type control method of this energy-saving running of injection moulding machine comprises following process: the voltage signal V that 1. gathers each magnetic valve in the injection machine at first synchronously
iAnd the proportional pressure valve current signal I in the ratio adjusting valve
pWith proportional flow control valve current signal I
f2. according to above-mentioned magnetic valve voltage signal V
iJudge that current injection machine has or not work, if each magnetic valve voltage signal V
iWhen all being zero, then beginning a time interval is T
dDelay, in the zero hour of time-delay, the low-limit frequency F that frequency converter output is earlier set in advance
TminInstruction is at T
dDelay time the finish time, gather the voltage signal V of each magnetic valve in the injection machine once more
iAnd judge, as still all being zero, then changed for the 1. step over to, as at least one magnetic valve voltage signal V
iNon-vanishing, then changed for the 3. step over to; 3. according to the current signal I of aforementioned proportion flow valve
fDetermine corresponding frequency converter the frequency F that should export
f4. according to the current signal I of aforementioned proportion pressure valve
pCome to determine corresponding system pressure P, and pressure P is determined the minimum F of the output frequency of corresponding frequency converter thus
Min(P); 5. judge F again
fWith F
Min(P) size, and with the output order of big person as frequency converter makes motor with more than or equal to F
fAnd F
Min(P) rotating speed operation.
Signals collecting in technical solution of the present invention can take following mode to carry out: the voltage signal V of each magnetic valve
iBe the pressure reduction at magnetic valve two ends; The current signal I of proportioning valve
f, I
pBe proportioning valve to be inserted this operation control module with series system.
Compared with prior art, the invention has the advantages that the current signal I that only adopts proportional flow control valve
fDecide the frequency values that totally should have, overall according to current pressure adjustment then lowest frequency value makes this method implement more convenient, easy; Moreover this method is only gathered the voltage signal V at hydraulic system electromagnetic valve coil two ends synchronously
iWith the current signal of ratio adjusting valve, and irrelevant with the injection machine electric control system that is adopted, thereby versatility is stronger; Also have, when all being zero, give low-limit frequency F of frequency converter earlier according to the voltage signal of magnetic valve
Tmin, through time T
dAfter the delay, vanishing rotary speed instruction or normal instruction again, this makes the rapid dynamic response speed of system, motor is stopped operating and energy savings to greatest extent.
Description of drawings
Fig. 1 is the inventive method principle schematic;
The control signal logic flow calcspar of Fig. 2 the inventive method embodiment 1;
The control signal logic flow calcspar of Fig. 3 the inventive method embodiment 2.
The specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
When injection machine adopts frequency converter to carry out Energy Saving Control, the energy-saving run control module of using this method is as intermediate member, the duty of each hydraulic valve of its monitoring injection machine, gather the voltage signal of each magnetic valve, the current signal of pressure valve and flow valve, judge injection machine present located duty with this, and calculate in view of the above frequency converter the frequency that should export, frequency input port control frequency converter by frequency converter, the output port of frequency converter output correspondent frequency removes to control the motor speed in the hydraulic injection molding machine system, its position such as Fig. 1 in whole system.
Embodiment 1, and referring to Fig. 2, this control method comprises following process: the voltage signal V that 1. gathers each magnetic valve in the injection machine at first synchronously
iAnd the proportional pressure valve current signal I in the ratio adjusting valve
pWith proportional flow control valve current signal I
G2. according to above-mentioned magnetic valve voltage signal V
iJudge that current injection machine has or not work, if each magnetic valve voltage signal V
iWhen all being zero, then frequency converter output zero rotary speed instruction stops operating motor fully, and changes for the 1. step over to; If each magnetic valve voltage signal V
iHave at least one non-vanishing, then changed for the 3. step over to; 3. according to the current signal I of aforementioned proportion flow valve
fDecide rotating speed of motor, promptly by the I that records
fCalculate the frequency F that corresponding frequency converter is exported with following computing formula
f, frequency converter output F
fInstruction, remove to control motor:
In the formula: c-be gain coefficient, Shooting Technique section that can be different is adjusted;
I
Fmax-be that proportional flow control valve is exported maximum stream flow Q
MaxThe time electric current;
F
Max-be that proportional flow control valve is exported maximum stream flow Q
MaxThe time correspondence the output frequency of frequency converter;
Q
Max-be the maximum output flow of proportional flow control valve;
D
f-be the initial current of proportional flow control valve, the electric current of correspondence when promptly flow is zero.4. according to the current signal I of proportional pressure valve
pVery little previous step is carried out necessary correction,: because in previous step, only decide rotating speed of motor according to the needed flow of hydraulic system, only be applicable to the situation that rotating speed is bigger, when rotating speed of motor is low, the hydraulic system constant displacement pump is difficult to export stable flow rate and keeps corresponding pressure, keep stable flow rate and pressure, must make a certain minimum speed of motor speed greater than the required pump of system, and this minimum speed is different and different with system pressure, therefore must calculate system pressure P according to following formula earlier:
Wherein: I
Pmax-be the maximum current of proportional pressure valve output
D
p-be the initial current of proportional pressure valve
P
Max-be proportional pressure valve and maximum current I
PmaxCorresponding maximum pressure
Pressure can get the minimum F of the output frequency of the frequency converter of the minimum speed correspondence of motor at this moment according to prior mensuration thus again
Min(P); 5. and then relatively F
Min(P) and F
fSize, F even
f＞F
Min(P), then the frequency converter output frequency is F
fInstruction; If F
f≤ F
Min(P), then the frequency converter output frequency is greater than F
Min(P) instruction, in a word, the frequency converter output frequency should satisfy more than or equal to F simultaneously
fAnd F
Min(P).
Embodiment 2, when common electric machine adopts frequency converter to drive, its dynamic response is lower, when system need slow down, can satisfy its decelerability faster by electro-hydraulic proportional valve, but when motor is from stopping to starting, the centre has an of short duration flow and is output as zero process, when frequency converter restarted, required consumed time was long like this, in order to shorten this starting process, promptly accelerate the response speed of system, in embodiment 2, see Fig. 3, increased following control procedure: voltage signal V when each the electromagnetic valve coil two ends that collects
iWhen all being zero, the low-limit frequency F of the frequency converter prior setting of output earlier
TminInstruction is through T time delay who sets in advance
dAfter, if remain whole V
iBe zero, just export zero rotary speed instruction, if at T
dThere is a magnetic valve to recover action in time again, promptly has a V at least
iNon-vanishing, then change into and exporting by normal frequency.Therefore the output signal of frequency converter is in the present embodiment:
In addition, this control method can also be according to the residing technological process section of each input-signal judging injection machine, and adjust finally for the frequency signal of frequency converter to following formula with this, as the control of carrying out fixed frequency at some process section or change gain coefficient c and low-limit frequency F
Tmin
Claims (4)
1. feedback-type control method that is used for energy-saving running of injection moulding machine is characterized in that comprising following process:
1. gather the voltage signal (V of each magnetic valve in the injection machine at first synchronously
i) and ratio adjusting valve in proportional pressure valve current signal (I
p) and proportional flow control valve current signal (I
f);
2. according to above-mentioned magnetic valve voltage signal (V
i) judge that current injection machine has or not work, if each magnetic valve voltage signal (V
i) when all being zero, then frequency converter output zero rotary speed instruction stops operating motor fully, and changed for the 1. step over to; If each magnetic valve voltage signal (V
i) have at least one non-vanishing, then changed for the 3. step over to;
3. according to the current signal (I of aforementioned proportion flow valve
f) determine corresponding frequency converter the frequency (F that should export
f);
4. according to the current signal (I of aforementioned proportion pressure valve
p) come to determine corresponding system pressure (P), and pressure (P) is determined the minimum F of the output frequency of corresponding frequency converter thus
Min(P);
5. judge F again
fWith F
Min(P) size, and with the output order of big person as frequency converter makes motor with more than or equal to F
fAnd F
Min(P) rotating speed operation.
2, the feedback-type control method of energy-saving running of injection moulding machine according to claim 1 is characterized in that the current signal (I according to proportional flow control valve
f) determine that frequency converter answers output frequency (F
f) method be to calculate according to following formula:
In the formula: c-be gain coefficient, Shooting Technique section that can be different is adjusted;
I
Fmax-be that proportional flow control valve is exported maximum stream flow Q
MaxThe time electric current;
F
Max-be that proportional flow control valve is exported maximum stream flow Q
MaxThe time correspondence the output frequency of frequency converter;
Q
Max-be the maximum output flow of proportional flow control valve;
D
f-be the initial current of proportional flow control valve, the electric current of correspondence when promptly flow is zero.
Determine frequency converter output frequency minimum F according to the current signal (Ip) of proportional pressure valve
Min(P) method is: calculate corresponding system pressure (P) according to following formula earlier, pressure (P) decides corresponding F according to prior mensuration thus again
Min(P):
In the formula: I
Pmax-be the maximum current of proportional pressure valve;
D
p-be the initial current of proportional pressure valve;
P
Max-be proportional pressure valve and maximum current I
PmaxCorresponding maximum pressure.
3, a kind of feedback-type control method that is used for energy-saving running of injection moulding machine is characterized in that comprising following process:
1. gather the voltage signal (V of each magnetic valve in the injection machine at first synchronously
i) and ratio adjusting valve in proportional pressure valve current signal (I
p) and proportional flow control valve current signal (I
f);
2. according to above-mentioned magnetic valve voltage signal (V
i) judge that current injection machine has or not work, if each magnetic valve voltage signal (V
i) when all being zero, then beginning a time interval is T
dDelay, in the zero hour of time-delay, the low-limit frequency (F that frequency converter output is earlier set in advance
Tmin) instruction, at T
dDelay time the finish time, gather the voltage signal (V of each magnetic valve in the injection machine once more
i) and judge, as still all being zero, then changed for the 1. step over to, as at least one magnetic valve voltage signal (V
i) non-vanishing, then changed for the 3. step over to;
3. according to the current signal (I of aforementioned proportion flow valve
f) determine corresponding frequency converter the frequency (F that should export
f);
4. according to the current signal (I of aforementioned proportion pressure valve
p) come to determine corresponding system pressure (P), and pressure (P) is determined the minimum F of the output frequency of corresponding frequency converter thus
Min(P);
5. judge F again
fWith F
Min(P) size, and with the output order of big person as frequency converter makes motor with more than or equal to F
fAnd F
Min(P) rotating speed operation.
4, the feedback-type control method of energy-saving running of injection moulding machine according to claim 3 is characterized in that the current signal (I according to proportional flow control valve
f) determine that frequency converter answers output frequency (F
f) method be to calculate according to following formula:
In the formula: c-be gain coefficient, Shooting Technique section that can be different is adjusted;
I
Fmax-be that proportional flow control valve is exported maximum stream flow Q
MaxThe time electric current;
F
Max-be that proportional flow control valve is exported maximum stream flow Q
MaxThe time correspondence the output frequency of frequency converter;
Q
Max-be the maximum output flow of proportional flow control valve;
D
f-be the initial current of proportional flow control valve, the electric current of correspondence when promptly flow is zero.
Determine frequency converter output frequency minimum F according to the current signal (Ip) of proportional pressure valve
Min(P) method is: calculate corresponding system pressure (P) according to following formula earlier, pressure (P) decides corresponding F according to prior mensuration thus again
Min(P):
In the formula: I
Pmax-be the maximum current of proportional pressure valve;
D
p-be the initial current of proportional pressure valve;
P
Max-be proportional pressure valve and maximum current I
PmaxCorresponding maximum pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021112916A CN1152775C (en) | 2002-04-05 | 2002-04-05 | Feedback type control method for energy-saving operation of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021112916A CN1152775C (en) | 2002-04-05 | 2002-04-05 | Feedback type control method for energy-saving operation of injection molding machine |
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| Publication Number | Publication Date |
|---|---|
| CN1376568A CN1376568A (en) | 2002-10-30 |
| CN1152775C true CN1152775C (en) | 2004-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021112916A Expired - Fee Related CN1152775C (en) | 2002-04-05 | 2002-04-05 | Feedback type control method for energy-saving operation of injection molding machine |
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| CN (1) | CN1152775C (en) |
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| CN110158264B (en) * | 2018-02-11 | 2021-10-15 | 无锡小天鹅电器有限公司 | Method for controlling motor, frequency converter and clothes treatment device |
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Owner name: NINGBO QIANPU MACHINERY MANUFACTURING CO., LTD. Free format text: FORMER OWNER: NINGBO HUAYE MACHINE MANUFACTURING CO., LTD. Effective date: 20080711 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080711 Address after: Zhejiang city of Ningbo Province Wang town Yinzhou District week Jiacun Patentee after: Ningbo Chap Machinery Manufacture Co., Ltd. Address before: Zhejiang city of Ningbo province Ganya source stone road Patentee before: Ningbo Hoyea Machine Manufacturing Co., Ltd. |
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Granted publication date: 20040609 Termination date: 20120405 |