CN101956264A - Device and method for online detecting drawing drafting force - Google Patents
Device and method for online detecting drawing drafting force Download PDFInfo
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- CN101956264A CN101956264A CN 201010253341 CN201010253341A CN101956264A CN 101956264 A CN101956264 A CN 101956264A CN 201010253341 CN201010253341 CN 201010253341 CN 201010253341 A CN201010253341 A CN 201010253341A CN 101956264 A CN101956264 A CN 101956264A
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Abstract
The invention relates to a device and a method for online detecting a drawing drafting force. The device comprises at least two groups of roller pairs; a hold-down type pressure bar is arranged in a front drafting area, and supports a sliver positioned on the upper surface of the hold-down type pressure bar; the two ends of the hold-down type pressure bar are fixedly connected with a pressure arm respectively; the other end of each pressure arm is sleeved to one end of each of two fixed shafts respectively; the other end of each fixed shaft is fixedly connected with two pressure levers respectively; the top ends of the two pressure levers are provided with a metal bump respectively; the metal bumps are in contact with own corresponding weighing sensor respectively; and the weighing sensors are parallel to the pressure levers, and are connected with a measurement display controller and a computer in turn. In a testing process, the weighing sensors acquire drafting force signals, and transmit data to the computer; and after the data is processed by instrument communication software, a drafting force-time relationship map is drawn in real time, so that variations of the drafting force are detected. The device and the method have the advantages of more proximity to actual production and capability of improving the accuracy of measurement results by utilizing the hold-down type pressure bar of a large drawing frame.
Description
Technical field
The present invention relates to detect in the field of textiles apparatus and method of drafting drafting force, particularly relate to a kind of apparatus and method of online detection drafting drafting force.
Background technology
Drawing-off is exactly that yarn is elongated the process that attenuates, and relates to the multiple working procedure in the weaving processing.The purpose of drawing-off is to allow yarn reach the thickness of regulation, so that the finishing of the use of next procedure or final products.In the process of taking out long drawing-down of yarn, apply axial external force to yarn, be present in interfibrous cohesive force and frictional force to overcome, fiber can be produced relatively move, it is parallel also to help stretching of fiber simultaneously.
In the drafting process,, overcome the used power of frictional resistance summation and be called drafting force taking out from slow speed fiber by whole faster fibres of front roller speed motion when extracting by the motion of rear roller speed.Drafting force has reflected fast contact power between the fiber at a slow speed in the draw zone.Because this contact power makes slow speed fiber become faster fibres under tensioning state, it is parallel that fiber is further stretched in drafting process.The drafting force size is suitable and keep stable, it is the necessary condition that guarantees fiber motion stabilization in draw zone, it directly influences the uniformity of product, and therefore, the online detection of counter extensioin power also is a kind of important means that guarantees product quality with monitoring in drafting process.
The drafting force testing arrangement depends on drafting system to carry out, and using is roller drafting device more widely.Roller drafting device generally is made up of roller several, and every pair of roller is divided into upper and lower roller again, forms strong jaw in roller pressurization back so that add and hold fiber.Make yarn take out long drawing-down thereby every pair of roller has a speed difference, at intervals be called roller gauge between every pair of roller simultaneously, the existence of roller gauge has been arranged, also just formed draw zone.
The drafting force measurement mechanism is summarized and is mainly contained two kinds of metering systems, and a kind of is to change the yarn transmission direction, measures according to the tension force of yarn; Another kind is to allow sensing device be connected with the front roller device, reacts the variation of drafting force according to the swing degree of front roller in the drafting process.Introduce several domestic and international roller draft force test devices below:
1, U.S. company drawing of fiber power analyzer, as shown in Figure 1.
Its measuring method is: the sensor device of power is connected with a movable pulley, and fiber strip is through pulley and become 180 ° of encirclements, determines the variation of drafting force according to the size and the variation of sensor values.This device has changed whole drafting system basically, the motion of fiber is difficult to control in the process of drawing-off, the variation of strip weight and speed can directly have influence on the variation that connects the sensor device pulley position during measurement, and the uncertainty of draw zone size directly influences the uncertain of floating fiber quantity.This measurement mechanism may reflect the variation of drafting force, but is difficult to measure comparatively exactly drafting force.Simultaneously, because the stressed and direction of motion and reality is different, therefore, the result of its test also will have than big-difference with actual conditions, can only be as a kind of simple method of testing in the laboratory.
2, drafting force tester, as shown in Figure 2.
Roller is driven respectively by former and later two motors before and after in this testing arrangement, the motor of front roller and the rotation of driving front roller is installed on the walking beam, drafting force can cause that front roller and walking beam swing together, by the swing of wobble detection beam, obtains the variation of drafting force indirectly.There is following problem in this detecting instrument: because motor is installed on the swing arm, the vibration of motor can be disturbed the detection of drafting force; The weight of motor has increased the swing effect of inertia of swing arm, also can have influence on the precision of measurement; Extensively adopt three rollers that two-region pressure bar drafting system is had big gap in the single zone drafting that adopts two pairs of rollers and the production application now.
3, drafting sample machine measurement mechanism, as shown in Figure 3.
Placement one roller bearing and a LOAD CELLS 3 are connected in the front draft zone of the little model machine of drafting, the height of the strip 9 of roller bearing during a little more than normal drawing-off, strip 9 from roller bearing by the time form certain angle, the strip 9 that passes through produces certain pressure because of the drawing-off effect produces tension force on roller bearing, LOAD CELLS 3 reacts the variation of drafting force by the size of reaction pressure, and last computer 1 is gathered these data.This device front roller to and middle roller between space and get up to have certain difficulty regulating.Simultaneously, according to also being difficult to realization on the drafting system of diagram 3 installation LOAD CELLS 3 large-scale drawing frame that uses in actual production below roller, can only be installed on the specific sample type.
More than several representative drafting force testing arrangements be mostly to have and carry out on the experiment type than big difference at specific simulation drafting system or with existing large-scale draft of drawing frame device, and having a certain distance with the used type of actual production, the gained data are obvious inadequately to the directive significance effect of actual production.
Summary of the invention
Technical problem to be solved by this invention provides a kind of apparatus and method of online detection drafting drafting force, can directly carry out the measurement of drafting force on large-scale draft of drawing frame device, thereby improves the degree of accuracy of measurement result.
The technical solution adopted for the present invention to solve the technical problems is: the device that a kind of online detection drafting drafting force is provided, comprise that at least two group rollers are right, and by the front draft zone of roller to forming, described roller is to being made up of top roller and bottom roll, there is the press-down type pressure bar in the described front draft zone, the strip that described press-down type pressure bar will be positioned at its upper surface is propped up, and two ends respectively are fixedly connected with the pressure arm of a same size; The other end of described two pressure arms is enclosed within an end of two fixed axis respectively, makes described press-down type pressure bar can drive described pressure arm and rotates around described fixed axis; The other end of described two fixed axis is fixedlyed connected with two depression bars respectively; Described two depression bar tops are equipped with metal salient point; Described metal salient point contacts with each self-corresponding LOAD CELLS; Described LOAD CELLS is parallel with described depression bar, and shows that with measurement controller links to each other; Described measurement shows that controller links to each other with computer.
Be 105 °～115 ° between described press-down type pressure bar two ends and the pressure arm, and fixedly connected.
Described pressure arm exceeds bottom roll axle 1-3mm.
Described press-down type pressure bar supports high 5-14mm with described strip.
The instrument bitcom is housed in the described computer.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of online detection drafting drafting force also is provided, may further comprise the steps:
(1) start drawing frame, strip enters draw zone, and normal drawing-off on the press-down type pressure bar, connects power initiation and measures demonstration controller and LOAD CELLS, stops drawing frame, shows that to measuring controller returns to zero;
(2) start drawing frame once more, connect by the instrument bitcom in the computer and measure the demonstration controller, make computer and measurement show the controller successful connection, and begin to measure;
(3) the drafting force signal of LOAD CELLS timing acquiring, and on measurement demonstration controller, show that computer real-time is obtained the drafting force signal that collects, and draw drafting force-time chart by its inner instrument bitcom;
(4) detect the drafting quality in real time according to drafting force-time chart of drawing out, and the data that detect are kept in the computer, so that further analyze.
In described step (1),, start the pressue device in the draft of drawing frame device earlier to before measure showing that controller returns to zero.
Beneficial effect
Owing to adopted above-mentioned technical scheme, the present invention compared with prior art has following advantage and good effect:
The present invention is installed in large-scale drawing frame to be had on the experiment board of identical drafter, therefore can on large-scale drawing frame, use, the press-down type pressure bar that utilizes drawing frame generally to have, strip can produce pressure to the press-down type pressure bar in drafting process, on the press-down type pressure bar, add checkout gear, this pressure can be delivered on the checkout gear, thereby can accurately measure.The present invention more approaches actual production with respect to other types drafting force measurement mechanism, has improved the degree of accuracy of measurement result simultaneously.
The present invention utilizes data collection software can gather measurement data in real time, and can draw out drafting force-time chart immediately, the variation of observation analysis drafting force more intuitively, thus quality of fiber is detected.As in producing the drawing frame operation problem taking place, also can regulate in real time and control according to the variation of drafting force.
Description of drawings
Fig. 1 is a drawing of fiber power analyzer structural representation in the prior art;
Fig. 2 is a drafting force tester structural representation in the prior art;
Fig. 3 is a drafting sample machine measurement mechanism structural representation in the prior art;
Fig. 4 is the structural representation of the embodiment of the invention 1;
Fig. 5 is the front view of Fig. 4;
Fig. 6 is force analysis figure of the present invention;
Fig. 7 is the structural representation of the embodiment of the invention 2;
Fig. 8 is the drafting force-time chart of the embodiment of the invention 3.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
As shown in Figure 4 and Figure 5, present embodiment relates to a kind of device of online detection drafting drafting force, adopts three rollers to double draft, press-down type pressure bar 5 front roller to and middle roller between the front draft zone in.This online detection drafting drafting force device comprises that three groups of rollers are right, and by the draw zone of roller to forming, described three groups of rollers are to by front roller right top roller 6 and bottom roll 11, top roller 8 that top roller 7 that middle roller is right and bottom roll 12 and rear roller are right and bottom roll 13 are formed, by front roller to having press-down type pressure bar 5 in to the front draft zone that constitutes with middle roller, the two ends of this press-down type pressure bar 5 respectively are fixedly connected with the pressure arm 15 of a same size, and be an angle between press-down type pressure bar 5 and the pressure arm 15, the scope of this angle is between 105 °～115 °.The other end of described two pressure arms 15 is enclosed within an end of two fixed axis 10 respectively, makes described press-down type pressure bar 5 can drive described pressure arm 15 and rotates around described fixed axis 10.The axle of the bottom roll 7 that these pressure arm 15 relative middle rollers are right will exceed 1-3mm, has guaranteed that pressure arm 15 can successfully rotate around fixed axis 10.The other end of described two fixed axis 10 is fixedlyed connected with two depression bars 4 respectively; Described two depression bar 4 tops are equipped with metal salient point 14; Described metal salient point 14 contacts with each self-corresponding LOAD CELLS 3; Described LOAD CELLS 3 is parallel with described depression bar 4, and shows that controller 2 links to each other with measuring; Described measurement shows that controller 2 links to each other with computer 1.Press-down type pressure bar 5 will be positioned at the strip 9 of its upper surface and prop up, the feasible high slightly 5-14mm of strip 9 herein, strip 9 is changed than the movement locus when the no press-down type pressure bar 5, but the floating fiber in the existence counter extensioin district of press-down type pressure bar 5 is controlled and is played positive role.When strip 9 can produce pressure to press-down type pressure bar 5 during through the front draft zone, this pressure is delivered on the LOAD CELLS 3 via depression bar 4 and metal salient point 14, LOAD CELLS 3 is gathered the signal of power, and transfer of data to measure showing controller 2, data show on the controller 2 through being presented at after superposeing to measure, and transfer in the computer 1, handle the back real-time rendering via the instrument bitcom in the computer 1 and go out drafting force-time chart, thereby detect the size variation of drafting force.
Press-down type pressure bar 5 and strip 9 are carried out force analysis, and as shown in Figure 6, F is a drafting force, and f is a strip 9 when being pressed on the press-down type pressure bar 5 motion and the frictional resistance that produces, T
aBe the inner tensions of strip 9, L be front roller pair and rear roller between space, P is that depression bar 4 is added in the pressure on the LOAD CELLS 3, T
bBe the component of one of T vertical and press-down type pressure bar 5 direction, L
3Be the length of depression bar 4, L
4Be the moment length of press-down type pressure bar 5.According to mechanics principle, obtain following equation:
Fcosθ＝(T
a+f)cosβ (1)
T＝Fsinα+(T
a+f)sinβ (2)
T
b＝Tcosθ (3)
PL
3＝TL
4cosθ (4)
Can get according to equation (1) and equation (2)
Equation (4) substitution equation (5) can be got the relation of pressure P and drafting force F:
In equation (6), θ is a strip to component T on the pressure T of press-down type pressure bar 5 and press-down type pressure bar 5 and the fixed axis 10 line AO vertical direction
bAngle, because of the direction of power T vertical with line BE, T
bVertical with line AO direction, so θ equals ∠ AOB; α is that the angle of drafting force F and line BE is ∠ EOF; β is strip tension force T
aWith the angle of frictional resistance f direction and line BE be ∠ COD.More than the trigonometric function value at each angle can calculate according to size among the figure, repeat no more herein.
Be not difficult to find that because the present invention is mounted in above large-scale drawing frame has the experiment board of identical drafter, therefore, the present invention can use on large-scale drawing frame.Sensor device can be regulated synchronously with press-down type pressure bar 5, does not therefore influence the adjusting of each technological parameter on the drawing frame.Utilize existing press-down type pressure bar 5 on the large-scale drawing frame, LOAD CELLS 3 is used by pressure arm 15, depression bar 4 and fixed axis 10 collocation with press-down type pressure bar 5 measure the drafting drafting force.Strip produces pressure T to press-down type pressure bar 5 in drafting process, this pressure by with press-down type pressure bar 5, make 4 pairs of LOAD CELLSs of depression bar 3 produce pressure P.Power suffered on the LOAD CELLS 3 can be gathered according to certain time interval, and this time interval can be set according to actual needs, collects pressure P and instant playback and is measuring on the control display instrument 2, and import in the computer 1.Final by the instrument bitcom real-time rendering data and curves in the computer, and can monitor in real time the drafting quality, measuring the data that finish can be kept in the computer with the EXCEL file format, calls analysis after being convenient to.
As shown in Figure 7, present embodiment relates to a kind of device of online detection drafting drafting force equally, its structure and embodiment 1 are roughly the same, its difference is, adopt four rollers to the drawing-off of three districts in the present embodiment, press-down type pressure bar 5 front roller to and middle roller between the front draft zone in, that is to say, the rear roller of embodiment 1 to after to add one group of roller of being made up of top roller 17 and bottom roll 16 right.Remainder and embodiment 1 are identical, do not repeat them here.This shows that the present invention can be under the condition of three rollers to double draft, at rear roller the back is constantly increased roller to the demand when satisfying in actual production, thereby make measurement result more accurate, and implementation is also more flexible.
Present embodiment relates to a kind of method of online detection drafting drafting force, may further comprise the steps: (1) starts drawing frame, strip enters draw zone, and normal drawing-off on the press-down type pressure bar, connect power initiation and measure demonstration controller and LOAD CELLS, stop drawing frame, show that to measuring controller returns to zero.(2) start drawing frame once more, connect by the instrument bitcom in the computer and measure the demonstration controller, make computer and measurement show the controller successful connection, and begin to measure.(3) the drafting force signal of LOAD CELLS timing acquiring, and on measurement demonstration controller, show that computer real-time is obtained the drafting force signal that collects, and draw drafting force-time chart by its inner instrument bitcom.Wherein, the time interval of LOAD CELLS collection signal can be set according to actual needs.(4) detect the drafting quality in real time according to drafting force-time chart of drawing out, and the data that detect are kept in the computer with the EXCEL file format, so that further analyze.In order to adapt to the difference of strip kind or thickness, before putting into strip operation machine, to show that controller returns to zero at every turn, thereby can obtain data more accurately measuring.What deserves to be mentioned is, in the step (1), before measurement is shown that controller returns to zero, can also start the pressue device in the draft of drawing frame device, its objective is and make strip not be pressed on the press-down type pressure bar under the tensioning state because of the drafting system pressurization is in, and then eliminate, thereby make measurement result more accurate because of the different thicknesses strip produces different pressure under tensioning state.
Furthermore bright with a concrete experiment below.
Experimental raw: viscose length is 38mm, and fineness is 1.67dtex; Weight of card sliver is 4.05g/m.
Technological parameter: 6 carded sliver feedings; Spacing is 42.5 * 44mm; Drafting multiple is 3.70 * 1.37; Front roller is 60m/min to sliver exporting speed.
LOAD CELLS is gathered the instantaneous value of a power every 100ms, and the collection sequence number is as shown in table 1 with collection numerical value, and collection sequence number and processing back data are as shown in table 2.Drafting force-time chart as shown in Figure 8.
1 of table 1 decimal point
Table 2
The scale of original collection numerical value is 1 in the table 1, and unit is gf.Calculate and unit is converted to data after cN obtains in the table 2 handling according to equation (6).Mean value through calculating drafting force that this experiment is surveyed is 156.24cN.
Claims (7)
1. the device of an online detection drafting drafting force, comprise that at least two group rollers are right, and by the front draft zone of roller to forming, described roller is to being made up of top roller and bottom roll, there is press-down type pressure bar (5) in the described front draft zone, it is characterized in that it is high that described press-down type pressure bar (5) will be positioned at strip (9) support of its upper surface, and two ends respectively are fixedly connected with the pressure arm (15) of a same size; The other end of described two pressure arms (15) is enclosed within an end of two fixed axis (10) respectively, makes described press-down type pressure bar (5) can drive described pressure arm (15) and rotates around described fixed axis (10); The other end of described two fixed axis (10) is fixedlyed connected with two depression bars (4) respectively; Described two depression bars (4) top is equipped with metal salient point (14); Described metal salient point (14) contacts with each self-corresponding LOAD CELLS (3); Described LOAD CELLS (3) is parallel with described depression bar (14), and shows that with measurement controller (2) links to each other; Described measurement shows that controller (2) links to each other with computer (1).
2. the device of online detection drafting drafting force according to claim 1 is characterized in that, is 105 °～115 ° between described press-down type pressure bar (5) two ends and the pressure arm (15), and fixedly connected.
3. the device of online detection drafting drafting force according to claim 1 and 2 is characterized in that, described pressure arm (15) exceeds bottom roll axle 1-3mm.
4. the device of online detection drafting drafting force according to claim 1 and 2 is characterized in that, described press-down type pressure bar (5) supports high 5-14mm with described strip (9).
5. the device of online detection drafting drafting force according to claim 1 is characterized in that, described computer is equipped with the instrument bitcom in (1).
6. the method for an online detection drafting drafting force is characterized in that, may further comprise the steps:
(1) start drawing frame, strip enters draw zone, and normal drawing-off on the press-down type pressure bar, connects power initiation and measures demonstration controller and LOAD CELLS, stops drawing frame, shows that to measuring controller returns to zero;
(2) start drawing frame once more, connect by the instrument bitcom in the computer and measure the demonstration controller, make computer and measurement show the controller successful connection, and begin to measure;
(3) the drafting force signal of LOAD CELLS timing acquiring, and on measurement demonstration controller, show that computer real-time is obtained the drafting force signal that collects, and draw drafting force-time chart by its inner instrument bitcom;
(4) detect the drafting quality in real time according to drafting force-time chart of drawing out, and the data that detect are kept in the computer.
7. the method for online detection drafting drafting force according to claim 6 is characterized in that, to before measure showing that controller returns to zero, starts the pressue device in the draft of drawing frame device earlier in described step (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102533411A CN101956264B (en) | 2010-08-13 | 2010-08-13 | Device and method for online detecting drawing drafting force |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102533411A CN101956264B (en) | 2010-08-13 | 2010-08-13 | Device and method for online detecting drawing drafting force |
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| CN101956264A true CN101956264A (en) | 2011-01-26 |
| CN101956264B CN101956264B (en) | 2012-02-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828288A (en) * | 2012-09-19 | 2012-12-19 | 焦作市海华纺织股份有限公司 | Spinning frame drafting drive system |
| CN103090997A (en) * | 2011-11-01 | 2013-05-08 | 常涛 | Pressure test instrument |
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| GB1131069A (en) * | 1964-12-17 | 1968-10-23 | Walter Wegener | Appraratus for controlling the cross sectional area of slivers in drawing |
| US3577600A (en) * | 1968-09-26 | 1971-05-04 | John S Graham | Apparatus for rapid automated measurement of drafting force and drafting force variability |
| EP0768399A1 (en) * | 1995-10-16 | 1997-04-16 | F.LLi Marzoli & C. S.p.A. | Automatic device for regulating and monitoring the tension of the sliver transferred from the drafting unit of a card to the sliver collection unit |
| US6292982B1 (en) * | 1999-02-13 | 2001-09-25 | TRüTZSCHLER GMBH & CO. KG | Sliver deflecting mechanism in a regulated draw frame |
| US6453515B1 (en) * | 2000-11-21 | 2002-09-24 | TRüTZSCHLER GMBH & CO. KG | Apparatus for measuring the tension of silver running in a draw frame |
| CN1861854A (en) * | 2005-05-11 | 2006-11-15 | 村田机械株式会社 | Traction device for spinning machine |
| CN101126186A (en) * | 2007-04-11 | 2008-02-20 | 东华大学 | Traction device for on-line detecting drafting force of short fibre bundle (network) |
| CN101139764A (en) * | 2007-02-15 | 2008-03-12 | 东华大学 | Cotton drill drafting force on-line detecting device and method |
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2010
- 2010-08-13 CN CN2010102533411A patent/CN101956264B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1131069A (en) * | 1964-12-17 | 1968-10-23 | Walter Wegener | Appraratus for controlling the cross sectional area of slivers in drawing |
| US3577600A (en) * | 1968-09-26 | 1971-05-04 | John S Graham | Apparatus for rapid automated measurement of drafting force and drafting force variability |
| EP0768399A1 (en) * | 1995-10-16 | 1997-04-16 | F.LLi Marzoli & C. S.p.A. | Automatic device for regulating and monitoring the tension of the sliver transferred from the drafting unit of a card to the sliver collection unit |
| US6292982B1 (en) * | 1999-02-13 | 2001-09-25 | TRüTZSCHLER GMBH & CO. KG | Sliver deflecting mechanism in a regulated draw frame |
| US6453515B1 (en) * | 2000-11-21 | 2002-09-24 | TRüTZSCHLER GMBH & CO. KG | Apparatus for measuring the tension of silver running in a draw frame |
| CN1861854A (en) * | 2005-05-11 | 2006-11-15 | 村田机械株式会社 | Traction device for spinning machine |
| CN101139764A (en) * | 2007-02-15 | 2008-03-12 | 东华大学 | Cotton drill drafting force on-line detecting device and method |
| CN101126186A (en) * | 2007-04-11 | 2008-02-20 | 东华大学 | Traction device for on-line detecting drafting force of short fibre bundle (network) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090997A (en) * | 2011-11-01 | 2013-05-08 | 常涛 | Pressure test instrument |
| CN102828288A (en) * | 2012-09-19 | 2012-12-19 | 焦作市海华纺织股份有限公司 | Spinning frame drafting drive system |
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| Publication number | Publication date |
|---|---|
| CN101956264B (en) | 2012-02-01 |
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