CN108195751A - A kind of yarn dynamic friction coefficient measuring system - Google Patents

A kind of yarn dynamic friction coefficient measuring system Download PDF

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Publication number
CN108195751A
CN108195751A CN201711448132.0A CN201711448132A CN108195751A CN 108195751 A CN108195751 A CN 108195751A CN 201711448132 A CN201711448132 A CN 201711448132A CN 108195751 A CN108195751 A CN 108195751A
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yarn
pulley
tension
friction coefficient
dynamic friction
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CN201711448132.0A
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CN108195751B (en
Inventor
刘皓
谢军
蒋铭媛
李莎
左召光
张毅
孟洁
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Tianjin Polytechnic University
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Tianjin Polytechnic University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00Investigating materials by mechanical methods
    • G01N19/02Measuring coefficient of friction between materials

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

The invention discloses a kind of yarn dynamic friction coefficient measuring systems, including the pre-tension device being installed on case front panel, start-stop button, first tension measuring device, second tension measuring device, buffer unit, close to switch, pulley, indicator light, for measuring the rotation-speed measuring device of the yarn speed of service, rotational speed regulation knob, yarn guide, winding device, the input roller installed on first stepper motor and its main shaft, the delivery roller installed on second stepper motor and its main shaft, the tracheae being connected with yarn guide, the air pump being connected with tracheae and the residual yarn basket for collecting residual yarn, and it is installed on the power module at the case front panel back side, analogue collection module, relay module, communication module and stepper motor driver.The present invention have many advantages, such as use cost it is low, it is easy to operate, can carry out that constant-tension test, detection efficiency and measuring accuracy are high, realize control in real time, and have the function of disconnection self-stopping and buffer breaking line preventive.

Description

A kind of yarn dynamic friction coefficient measuring system
Technical field
The present invention relates to a kind of yarn dynamic friction coefficient measuring instrument, more particularly to a kind of yarn dynamic friction coefficient Measuring system.
Background technology
Yarn dynamic friction coefficient measuring system mainly tests the dynamic friction coefficient between yarn of the same race, dynamic friction system Number is an important physical property of yarn.Dynamic friction coefficient possessed by yarn directly influences the technique effect of fabric Fruit.Study yarn dynamic friction coefficient can be modified technique, selection finish or formula of size, Improvement textile equipment or The surface property of guide tension part provides scientific basis.
Most institution of higher learning domestic at present, producer uses import CTT yarn Quality evaluations system in one's power for Research Center The thread friction conductivity test instrument of system and domestic LFY-110.CTT yarn Quality evaluation systems can measure the dynamic of yarn A variety of measurement contents such as state friction coefficient, yarn unevenness.CTT yarn Quality evaluations system is former using the test of entangling process Reason calculates the dynamic friction coefficient between yarn and yarn indirectly by the tension of test yarn.But such mode exist with Lower deficiency:
(1) system forms complicated, functional redundancy;
(2) complicated for operation, layman is not easy to operate;
(3) it is expensive, be not suitable for midget plant and use;
(4) body is heavy, is not easy to carry.
And domestic LFY-110 thread frictions coefficient instrument can also not only be tested with the dynamic friction coefficient of test yarn Yarn and roller and the friction coefficient of yarn and metal.It uses the test philosophy of capstan winch method, and Yarn homogeneous is coated on friction On roller, in addition an one thread is coated on 180 ° of cornerites on the friction roller of uniform coating cotton thread, and yarn is measured after friction roller rotation The tension at both ends, the friction coefficient calculation formula derived according to the Euler's formula of flexible belt calculate friction coefficient.Such side Formula has the following disadvantages:
(1) when measuring dynamic friction coefficient, the easy untwisting of yarn;
(2) operational speed range is smaller, it is impossible to meet requirement;
(3) measuring accuracy is relatively low;
(4) tension cannot be constant.
Invention content
In order to solve above-mentioned problems of the prior art, the present invention provides a kind of high certainty of measurement, constant tension, yarn Line is not easy the relatively low and easy to operate yarn dynamic friction coefficient measuring system of untwisting, cost.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of yarn dynamic friction coefficient measuring system, including cabinet and the pre-tension being installed on the front panel of cabinet Device, the first tension measuring device, the second tension measuring device, buffer unit, close switch, indicator light, is used for start-stop button Measure the rotation-speed measuring device of the yarn speed of service, rotational speed regulation knob, yarn guide, winding device, the first stepper motor and Input roller, the second stepper motor on its output shaft and the delivery roller on its output shaft are connected with the yarn guide Tracheae, the air pump being connected with the tracheae and the residual yarn basket for collecting residual yarn;
Yarn enters the input roller after the pre-tension device, and on input roller after winding 3-5 circles Into first tension measuring device, by entering the buffer unit after its extraction;
Yarn enters the winding device after being drawn via buffer unit, and enters described second after entanglement 2-3 circles herein Tension measuring device;
Yarn enters the delivery roller after being drawn via the second tension measuring device, and on it after winding 3-5 circles Into the yarn guide, the rotation-speed measuring device positioned at delivery roller side measures the rotating speed of delivery roller to judge the fortune of yarn Scanning frequency degree;
The rotational speed regulation knob is used to adjust the rotating speed of first stepper motor and the second stepper motor;
The back side of the front panel is equipped with:
Power module, for providing electric energy for the measuring system;
Analogue collection module, for acquiring pressure sensor in the first tension measuring device and the second tension measuring device Voltage data;
Relay module, the stopping action of instrument when being in fracture for yarn;
Communication module, for receive the data of the analog module and relay module and transmit it to computer into Row analyzing and processing;
And stepper motor driver, for controlling the start and stop of stepper motor and rotating speed.
Preferably, first tension measuring device is made of pressure sensor and three pulleys, three pulley positions In three apexes of isosceles triangle, the pulley cooperation installation of pressure sensor and top, for measuring the input of yarn Power, yarn successively according to counter clockwise direction around lower left pulley, clockwise around top pulley and in an anticlockwise direction about Enter the buffer unit after crossing lower right pulley.
Preferably, the buffer unit is made of three pulleys for being located at the isosceles triangle apex of a handstand, wherein The pulley of lower section is the movable pulley that can move up and down and can carry additionally different quality counterweight, buffering breaking line preventive for yarn, Pre-tension adjusts and balance detection, and yarn bypasses upper left pulley according to clockwise direction successively, counterclockwise bypasses After the movable pulley and clockwise direction of lower section are around the pulley in upper right side, into the winding device.
The lower section that the counterweight is mounted on close to switch, when the counterweight and the distance≤1mm close to switch When, the indicator light is lighted.
Preferably, the winding device is made of three pulleys positioned at isosceles triangle apex, wherein, it is located above The position of pulley being capable of up and down adjustment;The yarn bypasses be located above pulley in winding device after, and around winding device In be located at left side pulley yarn intersection winding 2-3 circle after, further around cross winding device in be located at right side pulley.
It is further preferred that in the intersection, around the folder of two forward and backward strands of top pulley (h) in winding device Angle is 35 °.
Preferably, the second tension measuring device is made of pressure sensor and three pulleys, the form of three pulleys Identical with first tension measuring device, yarn is successively according to counter clockwise direction around lower left pulley, clockwise direction Around top pulley and counterclockwise around the delivery roller is entered after the pulley of lower right, pressure sensor herein is used In the output tension for measuring yarn.
Preferably, the pre-tension device is by the wing nut, pagoda spring, two flakes that are sequentially arranged on bolt Washer and hex nut composition, when the yarn passes through tensioner, are clipped between described two flake washers.
It is further preferred that the input roller is identical with the shape of delivery roller, surface is smooth and internal for hollow knot Structure.
Compared with prior art, the present invention has the following advantages:
1. the present invention realizes the measurement of yarn dynamic friction coefficient, occupation of land can be saved, use cost is reduced, simplifies operation Process improves detection efficiency;
2. the present invention can accurately adjust the rotating speed for outputting and inputting roller, real-time display measurement data, real-time parameter are read It takes and analyzes, realize control in real time, measuring accuracy is high;
3. the present invention can carry out constant-tension test, there is disconnection self-stopping and buffering breaking line preventive.
Description of the drawings
Fig. 1 is the structure diagram on front panel in yarn dynamic friction coefficient measuring system of the present invention;
Fig. 2 is the structure diagram of front back in yarn dynamic friction coefficient measuring system of the present invention;
Fig. 3 be the present invention measuring system in yarn move towards schematic diagram.
Specific embodiment
The structure of the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Referring to attached drawing 1,2, yarn dynamic friction coefficient measuring system of the invention includes being installed on the front panel 1 of cabinet Pre-tension device 2, the start-stop button 4 that is installed on 1 upper left corner of front panel, interval be installed on first of 1 top of front panel Force measuring device 5-1 and the second tension measuring device 5-2, the first tension measuring device 5-1 and the second tonometry dress are installed on Put the winding device 16 between 5-2, the buffering for the lower part being installed between the first tension measuring device 5-1 and winding device 16 fills It is the indicator light 9 that put 6, is installed on 1 lower left corner of front panel, from top to bottom the rotational speed regulation knob 12 on the right side of plate forward-mounted, defeated Go out roller 11 and yarn guide 13 and positioned at the left side of delivery roller 11 rotation-speed measuring device 10, be installed on the left of front panel The first stepper motor 18-1 in portion and input roller 3 on its output shaft are installed on the second of front panel right side central Stepper motor 18-2 and delivery roller 11 on its output shaft, the tracheae 17 being connected with yarn guide 13, with 17 phase of tracheae Air pump 15 even and the residual yarn basket 14 for collecting residual yarn.The back side of plate 1 is equipped with power module 19, communication module in front 20th, analog module 21, relay 22 and stepper motor driver 23.The lower section of the counterweight (26) is mounted on close to switch 7, For detecting the equilibrium state of buffer unit 6, indicator light 9 can light when reaching equilibrium state.In the embodiment shown in power 3, As counterweight 26 and distance≤1mm close to switch 7, reach equilibrium state, indicator light 9 is lighted.
Wherein, pre-tension device 2 is by the wing nut, pagoda spring, two flake washers that are sequentially arranged on bolt And hex nut composition, pressure of the pagoda spring to flake gasket is adjusted by adjusting the rotation angle of wing nut, so as to Adjust the pressure suffered by the yarn clamped between flake washer;Rotational speed regulation knob 12 is used to adjust first stepper motor The rotating speed of 18-1 and the second stepper motor 18-2, and then adjust the rotating speed of input roller and delivery roller;Power module 19 is used for Electric energy is provided for the measuring system;Analogue collection module 21 is for the first tension measuring device 5-1 of acquisition and the second tension The voltage data of pressure sensor in measuring device 5-2;The stopping of instrument is moved when relay module 22 is in fracture for yarn Make;Communication module 20 is used to receive the data of analog module and relay module and transmit it to computer to carry out at analysis Reason;Stepper motor driver 23 is used to control start and stop and the rotating speed of stepper motor.
Referring to Fig. 3, using measuring device as described above, specific works step includes:
(1) it when the yarn 25 on winch spool 30 is by pre-tension device 2, is clipped between described two flake washers, from And a pre-tension has been applied in, subsequently into input roller 3, and the winding 3-5 circles on input roller 3;
(2) yarn 25 enters the first tension measuring device 5-1 on right side, the first tonometry after input roller 3 is drawn Device 5-1 is made of pressure sensor 24 and three pulleys a, b, c, and three pulleys are located at three vertex of an isosceles triangle Place, the pulley b cooperations of pressure sensor 24 and top are installed, for measuring the input tension of yarn 25, yarn 25 successively according to Lower right pulley c is counterclockwise bypassed around lower left pulley a, clockwise around top pulley b and counterclockwise After draw;
(3) yarn 25 enters the buffer unit 6 on the right side of it after tension measuring device 5-1 extractions, and buffer unit 6 is by being located at Three pulleys d, e, f composition of the one isosceles triangle apex to stand upside down, wherein the pulley e of lower section can to move freely and The movable pulley of different quality counterweight 26 can be carried additionally, the buffering breaking line preventive, pre-tension for yarn adjust and balance detection, yarn Line 25 is successively according to clockwise direction around upper left pulley d, counterclockwise around the movable pulley e of lower section and side clockwise To the pulley f around upper right side, subsequently into winding device 16;
(5) pulley g, h, i that winding device 16 3 is located at isosceles triangle apex are formed, wherein, it is located above It the position of pulley h being capable of up and down adjustment.Yarn 25 bypasses be located above pulley h in winding device 16 after, and around winding device It is located at right side in winding device 16 further around crossing after intersection winding 2-3 circles positioned at the yarn 25 of the pulley g in left side in 16 Pulley i.In one embodiment of the invention, it is forward and backward around the top pulley h in winding device 16 in the intersection The angles of two strands be 35 °.
(6) yarn 25 enters the second tension measuring device 5-2 on right side, the second tonometry after the extraction of winding device 16 Device 5-2, the mode for connecting three pulleys j, k, l is identical in the first tension measuring device 5-1, herein by pressure The output tension of force sensor measuring yarn 25;
(7) yarn 25 enters delivery roller 11, and wound on delivery roller 11 after the extraction of the second tension measuring device 5 3-5 is enclosed, and speed probe 10 measures the rotating speed of delivery roller 11 here, to judge the speed of service of yarn;
(8) yarn 25 is after the extraction of delivery roller 11, and into yarn guide 13, yarn guide is connected with the tracheae 17 of air pump 15 It connects, negative pressure is formed in yarn guide after tracheae discharge pressure-air, yarn 25 is sucked in residual yarn basket 14;
(9) the rotational speed regulation knob 12 in 1 upper right corner of case front panel is adjusted, stepper motor driver 23 can be controlled to step Stepper motor 18 sends the pulse of variation, and then the rotating speed of regulation motor.
In the above process, start-stop button 4 is pressed, the startup and stopping of stepper motor can be controlled;
When yarn dynamic friction coefficient measuring system is in operating status, the first tension measuring device 5-1 and second Force measuring device 5-2 is sent into analog module 21 by measuring tension of the yarn 25 in 16 both sides of winding device, by tension parameters, Communication module 20 is sent into after the processing of analog module 21, computer is finally sent data to and is analyzed and processed;
In the process of running, when yarn 25 is broken or during overtension, the first tension measuring device 5-1 and the second tension are surveyed After the data that measurement obtains are transmitted to computer judgement by amount device 5-2 by analog module 21 and communication module 20, calculate Machine sends instructions to communication module 20 and then relay 22 is controlled to be attracted, and finally makes system stalls;
Collected tension is calculated friction coefficient, and real-time display yarn by computer by friction coefficient calculation formula The input tension of line 25 exports tension and the change curve of friction coefficient.

Claims (10)

1. a kind of yarn dynamic friction coefficient measuring system, it is characterised in that:
It is surveyed including cabinet and the pre-tension device (2) being installed on the front panel (1) of cabinet, start-stop button (4), the first tension Amount device (5-1), the second tension measuring device (5-2), buffer unit (6), close to switch (7), indicator light (9), for measuring The rotation-speed measuring device (10) of the yarn speed of service, rotational speed regulation knob (12), yarn guide (13), winding device (16), first Stepper motor (18-1) and input roller (3) on its output shaft, the second stepper motor (18-2) and defeated mounted on its Delivery roller (11) on shaft, the tracheae (17) being connected with the yarn guide (13), the air pump being connected with the tracheae (17) (15) and the residual yarn basket (14) for collecting residual yarn,
Yarn (25) enters the input roller (3) after the pre-tension device (2), and is twined on input roller (3) Enter first tension measuring device (5-1) after 3-5 circles, by entering the buffer unit (6) after its extraction;
Yarn (25) enters the winding device (16) after being drawn via buffer unit (6), and enters institute after entanglement 2-3 circles herein State the second tension measuring device (5-2);
Yarn (25) enters the delivery roller (11), and twine on it after being drawn via the second tension measuring device (5-2) Enter the yarn guide (13) after 3-5 circles, the rotation-speed measuring device (10) positioned at delivery roller (11) side measures output sieve The rotating speed of (11) is drawn to judge the speed of service of yarn;
The rotational speed regulation knob (12) is for adjusting first stepper motor (18-1) and the second stepper motor (18-2) Rotating speed;
The back side of the front panel (1) is equipped with:
Power module (19), for providing electric energy for the measuring system;
Analogue collection module (21), for acquiring in the first tension measuring device (5-1) and the second tension measuring device (5-2) The voltage data of pressure sensor;
Relay module (22), the stopping action of instrument when being in fracture for yarn;
Communication module (20), for receiving the data of the analog module (21) and relay module (22) and transmitting it to Computer is analyzed and processed;
And stepper motor driver (23), for controlling the start and stop of stepper motor and rotating speed.
2. yarn dynamic friction coefficient measuring system according to claim 1, it is characterised in that:First tonometry Device (5-1) is made of pressure sensor (24) and three pulleys (a-c), and three pulleys (a-c) are positioned at an isoceles triangle On three vertex of shape;The pressure sensor (24) and pulley (a) cooperation being located above are installed, for measuring the defeated of yarn Enter tension;Yarn (25) is successively according to counter clockwise direction around lower left pulley (b), clockwise around top pulley (a) Enter the buffer unit (6) afterwards with counter clockwise direction around lower right pulley (c).
3. yarn dynamic friction coefficient measuring system according to claim 2, it is characterised in that:The buffer unit (6) It is made of three pulleys (d-f) of the isosceles triangle apex for being located at a handstand, wherein underlying pulley (e) is can The movable pulley of different quality counterweight (26) is moved up and down and can carry additionally, the buffering breaking line preventive, pre-tension for yarn are adjusted And balance detection, yarn (25) is successively according to clockwise direction around upper left pulley (d), counterclockwise around lower section After movable pulley and clockwise direction bypass the pulley in upper right side, into the winding device (16).
4. yarn dynamic friction coefficient measuring system according to claim 3, it is characterised in that:The close switch (7) Mounted on the lower section of the counterweight (26), when the counterweight (26) and distance≤1mm of the close switch (7), the finger Show that lamp (9) is lighted.
5. yarn dynamic friction coefficient measuring system according to claim 4, it is characterised in that:The winding device (16) The pulley (g-i) for being located at isosceles triangle apex by three forms, wherein, the position of the pulley (h) being located above can on Lower adjusting.
6. yarn dynamic friction coefficient measuring system according to claim 5, it is characterised in that:The yarn (25) bypasses After being located above pulley (h) in winding device (16), with around in winding device (16) be located at left side pulley (g) yarn (25) after intersection winding 2-3 circles, further around the pulley (i) for being located at right side in winding device (16) excessively.
7. yarn dynamic friction coefficient measuring system according to claim 6, it is characterised in that:In the intersection, Angle around two forward and backward strands of top pulley (h) in winding device (16) is 35 °.
8. the yarn dynamic friction coefficient measuring system according to any one of claim 1-7, it is characterised in that:Described Two tension measuring devices (5-2) are made of pressure sensor and three pulleys (j-l), the arrangement form of three pulleys and institute State the identical of the first tension measuring device (5-1), yarn (25) is successively according to counter clockwise direction around lower left pulley (j), suitable Clockwise enters the delivery roller (11) afterwards around top pulley (k) and counterclockwise around lower right pulley (l).
9. yarn dynamic friction coefficient measuring system according to claim 8, it is characterised in that:The pre-tension device (2) it is made of the wing nut, pagoda spring, two flake washers and the hex nut that are sequentially arranged on bolt, the yarn (25) by tensioner (2) it when, is clipped between described two flake washers.
10. yarn dynamic friction coefficient measuring system according to claim 9, it is characterised in that:The input roller (3) smooth and internal identical with the shape of delivery roller (11), surface is hollow structure.
CN201711448132.0A 2017-12-27 2017-12-27 Yarn dynamic friction coefficient measuring system Expired - Fee Related CN108195751B (en)

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Application Number Priority Date Filing Date Title
CN201711448132.0A CN108195751B (en) 2017-12-27 2017-12-27 Yarn dynamic friction coefficient measuring system

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111060418A (en) * 2019-12-16 2020-04-24 广东溢达纺织有限公司 Yarn dryness judging device and judging method thereof
CN112999570A (en) * 2021-04-01 2021-06-22 北京大学 Rehabilitation equipment for walking rehabilitation and assistance
CN113358556A (en) * 2021-06-11 2021-09-07 青岛大学 Testing device with yarn friction coefficient and friction fatigue detection functions and application

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CN111060418A (en) * 2019-12-16 2020-04-24 广东溢达纺织有限公司 Yarn dryness judging device and judging method thereof
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CN112999570A (en) * 2021-04-01 2021-06-22 北京大学 Rehabilitation equipment for walking rehabilitation and assistance
CN112999570B (en) * 2021-04-01 2022-06-14 北京大学 Rehabilitation equipment for walking rehabilitation and assistance
CN113358556A (en) * 2021-06-11 2021-09-07 青岛大学 Testing device with yarn friction coefficient and friction fatigue detection functions and application

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