CN101867337B - Intelligent braking method for knitting machine - Google Patents
Intelligent braking method for knitting machine Download PDFInfo
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- CN101867337B CN101867337B CN201010121931.9A CN201010121931A CN101867337B CN 101867337 B CN101867337 B CN 101867337B CN 201010121931 A CN201010121931 A CN 201010121931A CN 101867337 B CN101867337 B CN 101867337B
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- frequency converter
- time
- braking
- motor
- knitting machine
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Abstract
The invention relates to the technical field of knitted products, in particular to an intelligent braking method for a knitting machine. The braking method comprises the following steps of: setting a dynamic braking time, namely presetting an optimized braking time parameter or an optimal braking time at different speeds; during braking, determining the set braking time in the parameter according to the current rotational speed of a motor; controlling the frequency reduction time of a frequency converter according to the determined braking time; and in the set time, reducing the frequency of the frequency converter to zero and reducing the voltage output to the motor to zero at the same time so that the motor stops rotating and the knitting machine realizes braking. When the knitting machine is braked, different braking time is selected according to different rotational speed sections. Short braking time is set at high speed, and high stop time can avoid enough yarn tails supplied to the knitting machine for knitting after the yarns are broken. Longer braking time is set at low speed, the machine is not easy to sway during halting, and accessories of the machine are not easily abraded.
Description
Technical field:
The present invention relates to knitting machine product technical field, refer in particular to a kind of intelligent braking method of knitting machine.
Background technology:
Knitting machine (circle volume machine) is a kind of equipment of knitted or woven fabrics, its motor as power source is connected with frequency converter conventionally, the voltage starting motor of exporting by frequency converter, and control the rotating speed of motor, frequency converter can carry out by changing output frequency the rotary speed of governor motor.Conventionally when this frequency converter changes frequency, also need corresponding voltage, if only change frequency, motor may be burned.Particularly, in the time that frequency reduces, this problem is just very outstanding.In order to prevent the generation of burn-down of electric motor accident, frequency converter must change voltage in changing frequency simultaneously, for example: for the rotary speed that makes motor reduces by half, the output frequency of frequency converter must change to 30Hz from 60Hz, and at this moment the output voltage of frequency converter just must change to about 100V from 200V.As seen from the above, frequency converter is the braking equipment (conventionally claiming brake) that can be used as knitting machine.
At present, general knitting machine is before dispatching from the factory, and the braking time of frequency converter is changeless, and for example braking time (namely braking time, motor is reduced to for zero time by current rotating speed) is t.This mode fixing braking time is existed to certain deficiency, because the inertia of knitting machine under different rotating speeds is different, if braking time is all fixedly installed as t, under friction speed just there is very large difference in the shutdown smoothness of knitting machine.For example, if t setting is too small, braking time is short; in such cases, will cause machine down when equipment low cruise time, rock greatly, machine rocks great Yi and causes travelling gear and big disc gear wearing and tearing; cause gear to coordinate position excesssive gap, the cloth cover after braiding easily plays horizontal stripe.If t arranges excessive, braking time is oversize, and under running up, the excessive machine dwell time of inertia is long, while causing because of disorderly closedowns such as broken yarns, easily occurs that remaining yarn supplies with not knitting needle crocheting and knit, and causes falling cloth, goes out occurrence point.As can be seen here, how braking time t being set is the key that overcomes the problems referred to above.
Summary of the invention:
Technical problem to be solved by this invention is exactly the deficiency occurring in current brake process in order to overcome, and a kind of intelligent braking method of knitting machine is provided.In the method, braking time is not changeless, but sets best braking time according to current equipment rotating speed intelligence, makes brake process level and smooth, stable.
For solving the problems of the technologies described above, the present invention has adopted following technical scheme: this brake method is to set up dynamic braking time, set in advance one and optimize braking time parameter, best braking time under friction speed, when brake according to the rotating speed of current motor, by determining the braking time setting in parameter, control according to determined braking time the time that frequency converter frequency reduces, in setting-up time, the frequency of frequency converter is reduced to zero, the lower voltage that simultaneously exports motor to is zero, and motor stops operating, and knitting machine is realized brake.
Furthermore, in technique scheme, brake method comprises the following steps: a, in the computer of knitting machine, set in advance motor by transducer drive deceleration time under different rotating speeds, as brake parameter list; B, unlatching brake button, computer brake program starts; C, computer detection frequency converter numerical value now, and in pre-stored parameter list, inquire this motor rotary speed corresponding deceleration time according to the rotating speed of current motor; D, computer calculated within above-mentioned deceleration time, the timing numerical value of the every reduction of frequency converter frequency 1Hz, and opening timing device; E, timer are started working, and once, frequency converter output frequency reduces 1Hz to the every interruption of timer, and the voltage that exports motor to reduces by a unit, and the rotating speed of motor reduces a unit; The lower voltage that f, frequency converter export motor to is 1 o'clock, and frequency converter cuts out, and motor shuts down, and knitting machine is realized brake object.
Furthermore, in technique scheme, also have a detecting step before described step f, whether the voltage that detects frequency converter output has been reduced to zero, if be reduced to zero, frequency converter cuts out; If detect that the voltage of frequency converter output is non-vanishing, return to step e, timer is constantly worked, until the output voltage of frequency converter is reduced to zero.Guarantee the errorless of brake by this step.
The present invention adopts after technique scheme, and its beneficial effect having is: enable this intelligent braking method and can avoid fixing in current knitting machine the shortcoming that braking time method is brought.In this method, when knitting machine brake, can select different braking times according to different speed stages.When high speed, set short braking time, just can avoid soon down time the yarn uropodium after broken yarn enough to supply with knitting needle crocheting and knit.When low speed, set longer braking time, be just not easy to rock when machine stops, machine parts is just not easy to wear.
In addition, this method also can retain current brake method, realizes different changes of killing car mode by a function switch key.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is the circuit working schematic diagram of knitting machine;
Fig. 2 is control flow chart of the present invention.
Embodiment
See Fig. 1, this is the circuit working schematic diagram of knitting machine, and transformer is connected with extraneous power supply, and outside three phase mains is supplied with to knitting machine use after transformation.One power output end of transformer to transferring after control board, then is delivered to frequency converter by power delivery, by frequency converter by power delivery to motor.The rotating speed of motor will pass through Frequency Converter Control.By the transmission mechanism in motor driving knitting machine, realize the running of knitting machine.
The intelligent braking method adopting in the present invention is: set up dynamic braking time, set in advance one and optimize braking time parameter, best braking time under friction speed, when brake according to the rotating speed of current motor, by determining the braking time setting in parameter, control according to determined braking time the time that frequency converter frequency reduces, in setting-up time, the frequency of frequency converter is reduced to zero, the lower voltage that simultaneously exports motor to is zero, motor stops operating, and knitting machine is realized brake.
In conjunction with Fig. 2, this brake method comprises the following steps:
A, in the computer of knitting machine, set in advance motor by transducer drive deceleration time under different rotating speeds, as brake parameter list.
B, unlatching brake button, computer brake program starts.
C, computer detection frequency converter numerical value now, and in pre-stored parameter list, inquire this motor rotary speed corresponding deceleration time according to the rotating speed of current motor.
D, computer calculated within above-mentioned deceleration time, the timing numerical value of the every reduction of frequency converter frequency 1Hz, and opening timing device.
E, timer are started working, and once, frequency converter output frequency reduces 1Hz to the every interruption of timer, and the voltage that exports motor to reduces by a unit, and the rotating speed of motor reduces a unit.
Whether the voltage of e-1, the output of detection frequency converter has been reduced to zero, if be reduced to zero, frequency converter cuts out; If detect that the voltage of frequency converter output is non-vanishing, return to step e.
The lower voltage that f, frequency converter export motor to is 1 o'clock, and frequency converter cuts out, and motor shuts down, and knitting machine is realized brake object.
Illustrate below:
First preliminary setting parameter table in the computer of knitting machine, it is as shown in the table:
| Current rotating speed (V) | V0–V1 | V1–V2 | V2–V3 | V3–V4 |
| Best braking time (T) | T1 | T2 | T3 | T4 |
When needs stop knitting machine, or because knitting machine breaks down need to stop time, now first read the now rotating speed of motor, for example now the rotating speed V of motor is positioned at V1 – V2 velocity shooting, and its corresponding braking time is T2.Computer will calculate within the T2 time, and frequency converter is reduced to by current frequency in zero process, and how long every reduction 1Hz needs, the timing that this Shi Jian ⊿ T is timer.Next, timer is started working, and the time of Mei Jian Ge ⊿ T, timer interrupts once, and frequency converter reduces 1Hz, exports the voltage of motor to, also reduces a unit.Timer is constantly worked, and the frequency of frequency converter constantly reduces, and the voltage that exports motor to also constantly reduces, until be zero.In the time being reduced to zero, motor just quits work, and knitting machine is shut down, and has realized brake.
In this method, when knitting machine brake, can select different braking times according to different speed stages.When high speed, set short braking time, just can avoid soon down time the yarn uropodium after broken yarn enough to supply with knitting needle crocheting and knit.When low speed, set longer braking time, be just not easy to rock when machine stops, machine parts is just not easy to wear.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, and every any simple modification, equivalent variations and modification of doing according to the present invention, all still belongs in the scope of technical solution of the present invention.
Claims (1)
1. an intelligent braking method for knitting machine, is characterized in that: this brake method comprises the following steps:
A, in the computer of knitting machine, set in advance motor by transducer drive deceleration time under different rotating speeds, as brake parameter list;
B, unlatching brake button, computer brake program starts;
C, computer detection frequency converter numerical value now, and in pre-stored parameter list, inquire the deceleration time under this numerical value;
D, computer calculated within above-mentioned deceleration time, the timing numerical value of the every reduction of frequency converter frequency 1Hz, and opening timing device;
E, timer are started working, and once, frequency converter output frequency reduces 1Hz to the every interruption of timer, and the voltage that exports motor to reduces by a unit, and the rotating speed of motor reduces a unit;
Whether the voltage of e-1, the output of detection frequency converter has been reduced to zero, if be reduced to zero, frequency converter cuts out; If detect that the output voltage of frequency converter is non-vanishing, return to step e;
The lower voltage that f, frequency converter export motor to is 1 o'clock, and frequency converter cuts out, and motor shuts down, and knitting machine is realized brake object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010121931.9A CN101867337B (en) | 2010-03-08 | 2010-03-08 | Intelligent braking method for knitting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010121931.9A CN101867337B (en) | 2010-03-08 | 2010-03-08 | Intelligent braking method for knitting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101867337A CN101867337A (en) | 2010-10-20 |
| CN101867337B true CN101867337B (en) | 2014-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010121931.9A Expired - Fee Related CN101867337B (en) | 2010-03-08 | 2010-03-08 | Intelligent braking method for knitting machine |
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| Country | Link |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104079212A (en) * | 2014-07-16 | 2014-10-01 | 刘健萍 | Intelligent braking method of circular knitting machine |
| GB2549740B (en) * | 2016-04-26 | 2019-04-17 | Dyson Technology Ltd | A method for controlling an electric motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2945832A1 (en) * | 1978-11-14 | 1980-05-29 | Ferodo Sa | METHOD AND DEVICE FOR REDUCING THE SPEED OF AN ASYNCHRONOUS MOTOR |
| CN85201232U (en) * | 1985-04-01 | 1986-04-09 | 谢琼环 | V-power saving apparatus |
| CN1447517A (en) * | 2002-03-27 | 2003-10-08 | 村田机械株式会社 | Fast stop for rotary body |
| CN1838522A (en) * | 2005-03-23 | 2006-09-27 | 台达电子工业股份有限公司 | Motor operation state controlling method |
-
2010
- 2010-03-08 CN CN201010121931.9A patent/CN101867337B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2945832A1 (en) * | 1978-11-14 | 1980-05-29 | Ferodo Sa | METHOD AND DEVICE FOR REDUCING THE SPEED OF AN ASYNCHRONOUS MOTOR |
| CN85201232U (en) * | 1985-04-01 | 1986-04-09 | 谢琼环 | V-power saving apparatus |
| CN1447517A (en) * | 2002-03-27 | 2003-10-08 | 村田机械株式会社 | Fast stop for rotary body |
| CN1838522A (en) * | 2005-03-23 | 2006-09-27 | 台达电子工业股份有限公司 | Motor operation state controlling method |
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| CN101867337A (en) | 2010-10-20 |
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Granted publication date: 20140709 Termination date: 20170308 |