CN106443136A - Measurement method for in-place swing time of electro-magnetic selector needle selection cutting head of circular weft knitting machine - Google Patents
Measurement method for in-place swing time of electro-magnetic selector needle selection cutting head of circular weft knitting machine Download PDFInfo
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- CN106443136A CN106443136A CN201610977828.1A CN201610977828A CN106443136A CN 106443136 A CN106443136 A CN 106443136A CN 201610977828 A CN201610977828 A CN 201610977828A CN 106443136 A CN106443136 A CN 106443136A
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- needle selection
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- selection cutter
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- 238000009940 knitting Methods 0.000 title claims abstract description 10
- 238000000691 measurement method Methods 0.000 title abstract 3
- 238000000034 method Methods 0.000 claims abstract description 59
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 230000035772 mutation Effects 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000004907 flux Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000009472 formulation Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Knitting Machines (AREA)
Abstract
The invention relates to a measurement method for in-place swing time of an electro-magnetic selector needle selection cutting head of a circular weft knitting machine. The method comprises the first method or the second method. The first method is a graphing method. The graphing method comprises the following steps that numerical values of current changes are recorded at equal time intervals, a corresponding 'current-time' curve graph is drawn, the position where the abrupt change of the current occurs is found in the curve graph, accordingly, it is judged whether the needle selection cutting head swings to a limiting position or not, the time corresponding to the position where the abrupt change of the current occurs is recorded, and therefore the time when the electro-magnetic selector needle selection cutting head swings in place is measured. The current characteristics when an electromagnet works are utilized, through the measurement of the current changes, it is judged whether the needle selection cutting head has already swung to the limiting position or not, and then the required time when the needle selection cutting head swings to the limiting position can be measured. The measurement method is simple, the result is accurate, and the method can be used for an efficient measurement of a limiting needle selection frequency of an electro-magnetic selector under a given driving voltage.
Description
Technical field
The present invention relates to a kind of measuring method, when more particularly to being swung to by the slide cam selector needle selection cutter head of solenoid actuated
Between measuring method, belong to the technical field of slide cam selector.
Background technology
Slide cam selector is the critical component that circular knitting machine realizes pattern tissue.Digitalized needle selecting machine is divided into piezoelectric ceramic needle selecting machine and electricity
Two kinds of classifications of magnetic slide cam selector.Electromagnetic needle selector receives the welcome of user due to low cost.Electromagnetic needle selector is by being embedded with permanent magnetism
The composition such as the needle selection cutter head of body, electric magnet, slide cam selector frame and drive circuit.By the switching in electromagnet current direction, by magnetic
The iron core of change drives needle selection cutter head to swing to different positions so as to reach the purpose of needle selection.Swing due to needle selection cutter head puts in place
Time determines the highest frequency of needle selection, and then limits the working speed of knitting machine.Therefore needle selection cutter head swings to a time
It is important performance indications.The data that can find at present only has actual examination survey method, i.e., by giving current switching frequency, survey
Try the whether correct method of needle selection to determine whether to reach required frequency requirement.This method has engineering significance, but can not facilitate
Accurately obtain limiting frequency.It is therefore proposed that the present invention.
Content of the invention
For the above-mentioned technical problem of prior art, the invention provides a kind of electromagnetic needle selector needle selection cutter head swings to position
The measuring method of time, using current characteristics during work of electromagnet, by judging electromagnetic needle selection to the measurement of curent change
Whether device needle selection cutter head has swung to extreme position, and then realizes electromagnetic needle selector needle selection cutter head and swing to needed for extreme position
The measurement of time, the measuring method is simple, result accurate, can be used for limit needle selection of the electromagnetic needle selector under given driving voltage
The efficient measurement of frequency.
For reaching above-mentioned purpose, the present invention is achieved by the following technical solutions：
A kind of circular knitting machine electromagnetic needle selector needle selection cutter head swings to the measuring method of a time, is that one kind is driven by slide cam selector
The measurement of streaming current and realize the measurement that needle selection cutter head swings to a time, including method one or method two, described method one
For graphing method, described graphing method is comprised the following steps：Record current change numerical value corresponding " electricity is drawn in the constant duration
Stream-time " curve chart, finds out the position that electric current is undergone mutation in the graph, so as to judge whether needle selection cutter head has swung
To the time that extreme position, record current are undergone mutation corresponding to position, so as to measure the swing of electromagnetic needle selector needle selection cutter head
The time for putting in place；
Described method two is numerical method, and described numerical method is comprised the following steps：In needle selection cutter head from a left side
During extreme position swings to limit on the right-right-hand limit position, primary current numerical value is recorded in equal time interval Δ t, often record
Difference was carried out with the current values in a upper moment after primary current numerical value and Δ is obtained, draw slope k=Δ/Δ t；When slope k is prominent from 0
During change, judge that the driving voltage for providing electric magnet has been switched, now the record time is ts；When needle selection cutter head was swinging
Cheng Zhong, slope k is tapered into；When extreme position is close to, slope k is close to 0；When needle selection cutter head swings to extreme position,
Slope k is undergone mutation again, judges that now electromagnetic needle selector needle selection cutter head has swung to extreme position, and the record time is
te, a time is swung to for Δ t=t so as to measure electromagnetic needle selector needle selection cutter heade-ts.
Described method one and method two are all completed by measuring system, and described measuring system includes to be connected to electromagnetic separation
Drive module on pin device, described drive module is connected to current sensor and acquisition and control card, and described electric current is passed
Sensor is connected with acquisition and control card, and described acquisition and control card is connected with computer, described computer, current sensor, is adopted
Collection control card and the equal external power supply of drive module.
Beneficial effects of the present invention are as follows：
Electromagnetic needle selector of the present invention is by needle selection cutter head, electric magnet, slide cam selector frame and the drive circuit for being embedded with permanent magnet
Deng composition, which can complete intermittent oscillating motion limiting in angle.Using current characteristics during work of electromagnet, by right
The measurement of curent change is judging whether electromagnetic needle selector needle selection cutter head has swung to extreme position, and then realizes electromagnetic needle selection
Device needle selection cutter head swing to extreme position the time required to measurement, measuring method is simple, and measurement result is accurate.
Description of the drawings
Fig. 1 is existing circular knitting machine electromagnetic needle selector structural representation；
When Fig. 2 is worked for electromagnetic needle selector, needle selection cutter head swings to limit on the right-right-hand limit position view from limit on the left position；
When Fig. 3 is worked for electromagnetic needle selector, needle selection cutter head swings to limit on the left position view from limit on the right-right-hand limit position；
The permanent magnet being embedded on needle selection cutter head when Fig. 4-6 is worked for electromagnetic needle selector and electric magnet relative position schematic diagram；
Fig. 7 is test result schematic diagram；
Fig. 8 is measuring system block diagram.
Specific embodiment
With reference to specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to
This.
As shown in figures 1-8, a kind of circular knitting machine electromagnetic needle selector needle selection cutter head of the present invention swings to the measuring method of a time,
Including method one or method two.
Method one is graphing method, and graphing method is comprised the following steps：Record current change numerical value paint in the constant duration
Corresponding " current-vs-time " curve chart of system, finds out the position that electric current is undergone mutation, in the graph so as to whether judge needle selection cutter head
Extreme position is swung to, the time that record current is undergone mutation corresponding to position, so as to measure electromagnetic needle selector needle selection
Cutter head swings the time for putting in place.
Method two is numerical method, and numerical method is comprised the following steps：Swing from limit on the left position in needle selection cutter head
To limit on the right-right-hand limit position during, in equal time interval Δ t, primary current numerical value is recorded, often record primary current numerical value
Difference was carried out with the current values in a upper moment afterwards and Δ is obtained, draw slope k=Δ/Δ t；When slope k is from 0 mutation, judge
The driving voltage for providing electric magnet has been switched, and now the record time is ts；When needle selection cutter head is in swing process, slope k
Taper into；When extreme position is close to, slope k is close to 0；When needle selection cutter head swings to extreme position, slope k is sent out again
Raw mutation, judges that now electromagnetic needle selector needle selection cutter head has swung to extreme position, and the record time is te, so as to measure
Electromagnetic needle selector needle selection cutter head swings to a time for Δ t=te-ts.
The present invention by emulation and experimentation, when driving voltage is switched or electromagnetic needle selector needle selection cutter head swing
When putting in place, solenoid actuated electric current can be undergone mutation, and be based primarily upon this mutation to realize swinging electromagnetic needle selector needle selection cutter head
The measurement of arrival time.Specifically, from limit on the left position, limit on the right-right-hand limit position process is swung in electromagnetic needle selector needle selection cutter head
Divide three phases.These three stages are respectively：Electric current rapid increase stage, electric current gentle stage and electric current increase to the stabilization sub stage.
The three phases have obvious curent change feature, and the electric current rapid increase stage shows that driving voltage has been switched, electric current
Generation promutation, electromagnetic needle selector needle selection cutter head prepares to swing；The electric current gentle stage shows that curent change is slow, electromagnetic separation
Pin device needle selection cutter head is close to limit on the right-right-hand limit position；Electric current increase to the stabilization sub stage show electric current occur telomutation, electromagnetic needle selector
Needle selection cutter head swings to limit on the right-right-hand limit position.Whether feature hence with curent change judging electromagnetic needle selector needle selection cutter head
Through extreme position is swung to, and then realize the measurement the time required to electromagnetic needle selector needle selection cutter head swings to extreme position.In the same manner,
Electromagnetic needle selector needle selection cutter head swings to limit on the left position process from limit on the right-right-hand limit position, and curent change has the above three stage.
The present invention passes through current values in electromagnet coil using current sensor come real time record, by current values
Being processed and electromagnetic needle selector needle selection cutter head being measured by being analyzed is swung to a time.When driving voltage switches, electricity
Stream is undergone mutation, and now the record time is ts；When electromagnetic needle selector needle selection cutter head swings to extreme position, electric current occurs again
Mutation, now the record time is te.A time is swung to for Δ t=t so as to measure needle selection cutter heade-ts.
Measuring method of the present invention is based on following principle：
Shown in Fig. 4-6, the swing of permanent magnet drives the swing of needle selection cutter head, so as to reach the effect of needle selection.Assume electromagnetism
The initial position in the permanent magnet a certain moment being embedded on slide cam selector needle selection cutter head as shown in figure 4, after coil switch power, on coil
Electric current uprush, iron core upper end is geomagnetic into S pole.Now as permanent magnet remains static, induced potential is mainly flow through
The electric current impact of coil, can formulation：Now electric current rapid increase.When electric current increases to a certain number
When value, according to the principle of " homopolar-repulsion, heteropole is attracting ", permanent magnet starts to swing.With the swing of permanent magnet, which is produced
The direction of the raw magnetic line of force and the magnetic flux through iron core also can change therewith, so as to produce impact to electric current on coil.According to
Lenz's theorem, during permanent magnet is swung to Fig. 5 by Fig. 4, produces in the coil from top to bottom during permanent magnet magnetization iron core
Magnetic flux is gradually reduced, and reduces the speed of magnetic flux reduction so as to produce induced potential.When permanent magnet swings to Fig. 6 by Fig. 5
During, the magnetic flux through in coil from bottom to top is produced during permanent magnet magnetization iron core and is gradually strengthened, so as to produce electricity of inducting
The speed for pressing to reduce magnetic flux increase.The direction of the induced electromotive force produced by permanent magnet swing process be consistent, and
Its numerical values recited is more than 0 (assuming that the direction consistent with electric current is positive direction).In the swing process, due to the pendulum of needle selection cutter head
Angular width degree is little, the cross-sectional area of permanent magnet is narrow and small much larger than the cross-sectional area of electric magnet and the gap of permanent magnet and electric magnet,
Therefore, impact of the negligible air gap to coil inductance coefficient.Can formulation：Now, on coil
Electric current gradually tends towards stability.When permanent magnet is in Fig. 6 position, permanent magnet is no longer changed by the magnetic flux of iron core, so as to
This part induced electromotive force is caused to disappear, the electric current in coil is undergone mutation and increases to stationary value.In the same manner, permanent magnet opposite direction pendulum
During dynamic, the curent change curve on its coil is similar.Therefore, electromagnetism can be judged according to the variation characteristic of electric current
Whether slide cam selector needle selection cutter head has swung the time for putting and measuring that electromagnetic needle selector needle selection cutter head swings to position in place.
As shown in fig. 7, electromagnetic needle selector needle selection cutter head swing process divides three phases, respectively：Electric current rapid increase rank
Section；The electric current gentle stage；Electric current increases to the stabilization sub stage.Corresponding B flex point exactly electromagnetic needle selection when current curve is at A flex point
Device needle selection cutter head reaches the limit of the moment of position.Corresponding time during record current mutation, which is respectively te and ts.Therefore,
Electromagnetic needle selector needle selection cutter head is T'=T from switching driving voltage to its total time for swinging to extreme positione-Ts.
As shown in figure 8, the method for the present invention one and method two are all completed by measuring system, described measuring system includes
The drive module being connected on electromagnetic needle selector, described drive module is connected to current sensor and acquisition and control card,
Described current sensor is connected with acquisition and control card, and described acquisition and control card is connected with computer, and described calculating is mechanical, electrical
Flow sensor, acquisition and control card and the equal external power supply of drive module.
Based on above-mentioned measuring method, the processing mode for record current numerical value can have two ways, numerical value processing mode
Two kinds of not limited to this.
Above-described embodiment is only used for illustrating the inventive concept of the present invention, rather than the restriction to rights protection of the present invention,
All changes for carrying out unsubstantiality using this design to the present invention, all should fall into protection scope of the present invention.
Claims (2)
1. a kind of circular knitting machine electromagnetic needle selector needle selection cutter head swings to the measuring method of a time, it is characterised in that by slide cam selector
The measurement of driving current and realize the measurement that needle selection cutter head swings to a time, including method one or method two, described method
One is graphing method, and described graphing method is comprised the following steps：Record current change numerical value draw corresponding in the constant duration
" current-vs-time " curve chart, finds out the position that electric current is undergone mutation in the graph, so as to judge whether needle selection cutter head has been put
Extreme position is moved, the time that record current is undergone mutation corresponding to position, so as to measure electromagnetic needle selector needle selection cutter head pendulum
The dynamic time for putting in place；
Described method two is numerical method, and described numerical method is comprised the following steps：In needle selection cutter head from limit on the left
During position swings to limit on the right-right-hand limit position, primary current numerical value is recorded in equal time interval Δ t, often record once
Difference was carried out with the current values in a upper moment after current values and Δ is obtained, draw slope k=Δ/Δ t；When slope k is from 0 mutation
When, judge that the driving voltage for providing electric magnet has been switched, now the record time is ts；When needle selection cutter head is in swing process
In, slope k is tapered into；When extreme position is close to, slope k is close to 0；When needle selection cutter head swings to extreme position, tiltedly
Rate k is undergone mutation again, judges that now electromagnetic needle selector needle selection cutter head has swung to extreme position, and the record time is te,
A time is swung to for Δ t=t so as to measure electromagnetic needle selector needle selection cutter heade-ts.
2. circular knitting machine electromagnetic needle selector needle selection cutter head as claimed in claim 1 swings to the measuring method of a time, and its feature exists
In：Described method one and method two are all completed by measuring system, and described measuring system includes to be connected to electromagnetic needle selector
On drive module, described drive module is connected to current sensor and acquisition and control card, described current sensor
It is connected with acquisition and control card, described acquisition and control card is connected with computer, described computer, current sensor, collection control
Fabrication and the equal external power supply of drive module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610977828.1A CN106443136A (en) | 2016-11-08 | 2016-11-08 | Measurement method for in-place swing time of electro-magnetic selector needle selection cutting head of circular weft knitting machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610977828.1A CN106443136A (en) | 2016-11-08 | 2016-11-08 | Measurement method for in-place swing time of electro-magnetic selector needle selection cutting head of circular weft knitting machine |
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| CN106443136A true CN106443136A (en) | 2017-02-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108342823A (en) * | 2018-03-29 | 2018-07-31 | 常熟长润智能科技有限公司 | The selection piece component of slide cam selector |
| CN108642699A (en) * | 2018-07-18 | 2018-10-12 | 广东创达自动化装备有限公司 | A kind of trouble hunting system and method for the electromagnetic needle selector of circular knitting machine |
| CN109023694A (en) * | 2018-07-19 | 2018-12-18 | 浙江理工大学 | A kind of slide cam selector RTA reliability test assembly |
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| CN102033199A (en) * | 2010-12-20 | 2011-04-27 | 常熟理工学院 | System for testing dynamic parameter of high-speed electromagnetic valve for knitting machine |
| CN104360261A (en) * | 2014-10-29 | 2015-02-18 | 国家电网公司 | Method for coil current curve reconstruction of circuit breaker operating mechanisms on basis of feature points |
| CN106019131A (en) * | 2016-05-18 | 2016-10-12 | 四川大学 | State comprehensive evaluation method for high-voltage circuit breaker operating mechanism based on switching-on and switching-off coil currents |
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Patent Citations (5)
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| CN101688624A (en) * | 2007-07-06 | 2010-03-31 | 罗伯特·博世有限公司 | Method for determining a position of an armature in a solenoid valve and a device for operating a solenoid valve with an armature |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108342823A (en) * | 2018-03-29 | 2018-07-31 | 常熟长润智能科技有限公司 | The selection piece component of slide cam selector |
| CN108642699A (en) * | 2018-07-18 | 2018-10-12 | 广东创达自动化装备有限公司 | A kind of trouble hunting system and method for the electromagnetic needle selector of circular knitting machine |
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| CN109023694A (en) * | 2018-07-19 | 2018-12-18 | 浙江理工大学 | A kind of slide cam selector RTA reliability test assembly |
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Application publication date: 20170222 |