CN104749098A - Method and device for testing friction factor of yarns drawn by airflows - Google Patents
Method and device for testing friction factor of yarns drawn by airflows Download PDFInfo
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- CN104749098A CN104749098A CN201510172478.7A CN201510172478A CN104749098A CN 104749098 A CN104749098 A CN 104749098A CN 201510172478 A CN201510172478 A CN 201510172478A CN 104749098 A CN104749098 A CN 104749098A
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Abstract
The invention provides a method and a device for testing the friction factor of yarns drawn by airflows. The method comprises the following steps: S1. building a three-dimensional geometrical model of internal and external flow fields of the testing device according to a main structure of the testing device, carrying out mesh dividing on the three-dimensional geometrical model and exporting the corresponding formatted file; S2. importing the formatted file into flow field analysis software, setting boundary conditions, carrying out numerical simulation and acquiring relevant parameters required by calculation of the traction force of the yarns; and S3. testing the traction force of the yarns by an airflow testing device and acquiring the magnitude of the traction force stressed to a small section of the yarn under conditions of different relative speeds, different air supply pressures and different yarns, and inversely calculating to acquire the friction factor of the yarn and the air flows at different relative speeds according to a weft yarn traction force calculation model.
Description
Technical field
The invention belongs to field, air-jet loom air-jet weft insertion flow field, be specifically related to a kind of yarn draws friction factor method of testing and device by air-flow.
Background technology
Air-jet loom is the fabric manufacture equipment adopting jet-stream wind weft traction to pass through shed open.It utilizes air as wefting insertion medium, produces frictional traction and draws, yarn band is crossed shed open, is reached the object of wefting insertion by the jet of jet generation with the compressed air stream ejected to weft yarn.Such filling insertion way can realize at a high speed, high yield.Air-jet loom, because filling insertion way is reasonable, enter the advantages such as latitude rate is high, running operation handy and safe, varietal adaptation are wide, machine material consumption is few, efficiency is high, the speed of a motor vehicle is high, noise is low, is widely used.
In jet loom for drawing weft yarn process, the size of tractive force suffered by weft yarn is one of important indicator weighing nozzle jet performance quality.At present study meticulous not enough on important parameter affect Weft force, as the important parameter affecting tractive force, different supply gas pressure, different relative velocity, between different yarns downstream and yarn the test of friction factor and derivation rarely have research.
In view of the foregoing, the invention provides a kind of yarn draws friction factor method of testing and device by air-flow.
Summary of the invention
The invention provides the proving installation of a kind of yarn by air-flow traction friction factor, comprise the coaxial pipes of spray nozzle device, thread tube and front end thereof, the connected mode of described coaxial pipes and thread tube is clamping or docking, and both adopt frame to fix, O-ring seal sealing.
The present invention also provides a kind of yarn by the method for testing of air-flow traction friction factor, comprises the following steps.
S1, primary structure according to proving installation, set up the 3-D geometric model of proving installation internal and external flow field, and carry out stress and strain model to described three-dimensional model, and derive corresponding formatted file, forms finite element model.
S2, the finite element model of above-mentioned formation is imported flow field analysis software, conditions setting also carries out numerical simulation, obtains the flow field characteristic of proving installation.
S3, by air-flow proving installation, tractive force test is carried out to yarn, draw the size of suffered tractive force on a bit of yarn under different relative velocity, different supply gas pressure, different yarns, and inquire into according to Weft force computation model is anti-the friction factor between different relative velocity downstream and yarn.
Preferably, step S1 also comprises: convert 3-D geometric model to corresponding formatted file, and is imported in stress and strain model software by described formatted file, derives corresponding formatted file to it after carrying out stress and strain model, forms finite element model.
Preferably, in step s 2, described parameter comprises the average density of yarn in the relative velocity of air-flow and yarn, a bit of length, yarn diameter and tractive force.
Draw method of testing and the device of friction factor by air-flow according to yarn provided by the invention, by setting up the 3-D geometric model in proving installation flow field, and three-dimensional model is carried out stress and strain model, form finite element model, the finite element model formed is imported flow field analysis software and carries out numerical simulation, obtain the flow field characteristic of proving installation.Meanwhile, according to the tension force measured value of tensiometer in test process, tractive force size is obtained.In conjunction with before the relevant parameter that draws, finally obtain friction factor, contribute to strengthening understanding in depth air-jet loom air-jet weft insertion, be better applied to engineering reality.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is that the yarn that present pre-ferred embodiments provides is subject to air-flow to draw the method for testing process flow diagram of friction factor;
Fig. 2 is that the yarn that present pre-ferred embodiments provides is subject to air-flow to draw the proving installation primary structure schematic diagram of friction factor;
Fig. 3 is that the yarn that present pre-ferred embodiments provides is subject to air-flow to draw the proving installation internal and external flow field geometric model schematic diagram of friction factor;
Fig. 4 is that the yarn that present pre-ferred embodiments provides is subject to air-flow to draw the proving installation flow field grid finite element model schematic diagram of friction factor;
Fig. 5 is that the yarn that present pre-ferred embodiments provides is subject to air-flow to draw the proving installation nozzle air current wefting insertion tractive force test pattern of friction factor.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Fig. 1 is that the yarn that present pre-ferred embodiments provides is subject to air-flow to draw the method for testing process flow diagram of friction factor.As shown in Figure 1, the method for testing that the yarn that present pre-ferred embodiments provides draws friction factor by air-flow comprises step S1 to S3.
Step S1: according to the primary structure of proving installation, sets up the 3-D geometric model of proving installation internal and external flow field, and carries out stress and strain model to described three-dimensional model, and derives corresponding formatted file.
Fig. 2 is that the yarn that present pre-ferred embodiments provides is subject to air-flow to draw the proving installation primary structure schematic diagram of friction factor.Fig. 3 is that the yarn that present pre-ferred embodiments provides is subject to air-flow to draw the proving installation internal and external flow field geometric model schematic diagram of friction factor.Fig. 4 is that the yarn that present pre-ferred embodiments provides is subject to air-flow to draw the proving installation flow field stress and strain model schematic diagram of friction factor.Composition graphs 3 and Fig. 4, in fig. 2, the yarn that present pre-ferred embodiments provides comprises the coaxial pipes 3 of spray nozzle device 1, thread tube 2 and front end thereof by the proving installation primary structure of air-flow traction friction factor, and the connected mode of described coaxial pipes 3 and thread tube 2 is clamping or docking.In the present embodiment, described coaxial pipes 3 and thread tube 2 adopt frame to fix, O-ring seal sealing, in other embodiment, alternate manner also can be adopted to fix, but be not construed as limiting this present invention.So, stable air-flow can be obtained in coaxial pipes, facilitate the air-flow of relative constancy and the relative velocity of yarn in acquisition one segment length.
Step S2: above-mentioned formatted file is imported flow field analysis software, and conditions setting also carries out numerical simulation, obtains the flow field characteristic of proving installation.
Step S3: tractive force test is carried out to yarn by air-flow proving installation, draw the size of suffered tractive force on a bit of yarn under different relative velocity, different supply gas pressure, different yarns, and inquire into according to Weft force computation model is anti-the friction factor between different relative velocity downstream and yarn.
Fig. 5 is that the yarn that present pre-ferred embodiments provides is subject to air-flow to draw the proving installation nozzle air current wefting insertion tractive force test pattern of friction factor.As shown in Figure 5, A is tension pick-up, and B is weft yarn, and C is nozzle, and D is subsidiary conduit, and E is tensiometer.In the present embodiment, weft yarn B and tension pick-up A is on same level line, and weft yarn B forms tension force by air-flow draw, obtains corresponding tension value by tension pick-up A perception on tensiometer E.
In sum, air-flow is subject to draw method of testing and the device of friction factor according to the yarn that present pre-ferred embodiments provides, by setting up the 3-D geometric model in proving installation flow field, and after three-dimensional model is carried out stress and strain model, the test of air-jet weft insertion tractive force is carried out to proving installation, and carry out numerical simulation, draw relevant parameter.Meanwhile, according to the measured value of tensiometer in test process, obtain tractive force size.In conjunction with before the relevant parameter that draws, finally obtain friction factor.So, contribute to increasing the understanding to Air Flow Velocity on An Air-Jet Loom, thus enhance productivity.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to embodiment illustrated herein, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (4)
1. a yarn is subject to air-flow to draw the proving installation of friction factor, it is characterized in that, comprise the coaxial pipes of spray nozzle device, thread tube and front end thereof, the connected mode of described coaxial pipes and thread tube is clamping or docking, and both adopt frame to fix, O-ring seal sealing.
2. use the yarn of device described in claim 1 by a method of testing for air-flow traction friction factor, it is characterized in that, comprise the following steps:
S1, primary structure according to proving installation, set up the 3-D geometric model of proving installation internal and external flow field, and carry out stress and strain model to described three-dimensional model, and derive corresponding format file, forms finite element model;
S2, the finite element model of above-mentioned formation is imported flow field analysis software, conditions setting also carries out numerical simulation according to fluid dynamic theory, obtains the flow field characteristic of proving installation;
S3, by air-flow proving installation, tractive force test is carried out to yarn, draw the size of suffered tractive force on a bit of yarn under different relative velocity, different supply gas pressure, different yarns, and inquire into according to Weft force computation model is anti-the friction factor between different relative velocity downstream and yarn.
3. method according to claim 2, it is characterized in that, step S1 also comprises: convert 3-D geometric model to corresponding formatted file, and described formatted file is imported stress and strain model software, derive corresponding formatted file after stress and strain model is carried out to it, form finite element model.
4. method according to claim 2, is characterized in that, in step s 2, described parameter comprises the average density of yarn in the relative velocity of air-flow and yarn, a bit of length, yarn diameter and tractive force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510172478.7A CN104749098A (en) | 2015-04-13 | 2015-04-13 | Method and device for testing friction factor of yarns drawn by airflows |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510172478.7A CN104749098A (en) | 2015-04-13 | 2015-04-13 | Method and device for testing friction factor of yarns drawn by airflows |
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| CN104749098A true CN104749098A (en) | 2015-07-01 |
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| CN201510172478.7A Pending CN104749098A (en) | 2015-04-13 | 2015-04-13 | Method and device for testing friction factor of yarns drawn by airflows |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105957A (en) * | 1985-08-06 | 1987-02-25 | 里特机械公司 | The equipment of production method of yarn |
| AU4691093A (en) * | 1992-08-18 | 1994-03-15 | Alan Nicholas Jacobsen | Improved method and apparatus for open end yarn spinning |
| US6052985A (en) * | 1997-09-08 | 2000-04-25 | Volkmann Gmbh & Co. | Device for producing a twisted yarn in a combined spinning and twisting process |
| EP1087488A1 (en) * | 1999-09-22 | 2001-03-28 | Milliken & Company | Conduit insert for optical fiber cable |
| CN103866475A (en) * | 2014-02-24 | 2014-06-18 | 江苏宋和宋智能科技有限公司 | Pneumatic shuttle loom and use method of pneumatic shuttle loom |
-
2015
- 2015-04-13 CN CN201510172478.7A patent/CN104749098A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105957A (en) * | 1985-08-06 | 1987-02-25 | 里特机械公司 | The equipment of production method of yarn |
| AU4691093A (en) * | 1992-08-18 | 1994-03-15 | Alan Nicholas Jacobsen | Improved method and apparatus for open end yarn spinning |
| US6052985A (en) * | 1997-09-08 | 2000-04-25 | Volkmann Gmbh & Co. | Device for producing a twisted yarn in a combined spinning and twisting process |
| EP1087488A1 (en) * | 1999-09-22 | 2001-03-28 | Milliken & Company | Conduit insert for optical fiber cable |
| CN103866475A (en) * | 2014-02-24 | 2014-06-18 | 江苏宋和宋智能科技有限公司 | Pneumatic shuttle loom and use method of pneumatic shuttle loom |
Non-Patent Citations (2)
| Title |
|---|
| 徐存强: "《苏州大学2013年硕士学位论文》", 16 September 2013 * |
| 徐存强等: "气流引纬主喷嘴内气流速度与纬纱间摩擦因数的关系", 《纺织学报》 * |
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