CN-121977959-A - Knitting needle and yarn wear resistance testing device and method

CN121977959ACN 121977959 ACN121977959 ACN 121977959ACN-121977959-A

Abstract

The invention relates to a knitting needle and yarn wear resistance testing device and a method thereof, wherein the knitting needle and yarn wear resistance testing device comprises a frame, a yarn outgoing device, a yarn winding device, a knitting needle and a knitting needle clamping device, wherein the yarn outgoing device, an outgoing reciprocating screw rod, an outgoing yarn guide ring, an outgoing positioning roller, a speed sensor and an outgoing tension sensor are sequentially arranged on the frame on the outgoing side from left to right, the winding tension sensor, the winding positioning roller, the winding yarn guide ring, the winding reciprocating screw rod and the yarn winding device are sequentially arranged on the frame on the outgoing side from left to right, and the yarn is sequentially subjected to the outgoing reciprocating screw rod, the outgoing yarn guide ring, the outgoing positioning roller, the speed sensor, the outgoing tension sensor, the knitting needle, the winding tension sensor, the winding positioning roller, the winding yarn guide ring, the winding reciprocating screw rod and the flying feather device after being pulled out from the yarn outgoing device.

Inventors

WU YUQIN
WANG PEI
YU LIANQING
XIAO MI
ZENG YANG
XU WANG
ZHU JIANYU
GAN HONG
CHEN YONGKANG
CHEN YITAO
CHEN HAO

Assignees

武汉纺织大学

Dates

Publication Date: 20260505
Application Date: 20260115

Claims (9)

1. The utility model provides a knitting needle and yarn stand wear resistance test device, its characterized in that includes frame (1), yarn outlet device (2), yarn take-up device (3), knitting needle (4) and knitting needle clamp get device (5), be provided with knitting needle clamp get device (5) perpendicularly on frame (1), knitting needle clamp get device (5) are used for vertical fixation a plurality of knitting needles (4), frame (1) regard knitting needle clamp get device (5) as limit left and right sides respectively be the wire side and receive the line side, be provided with yarn outlet device (2), wire reciprocating lead screw (6), wire guide ring (7), wire positioning roller (8), speed sensor (9) and wire tension sensor (10) on wire side frame (1) from left to right in order, speed sensor (9) are used for real-time detection yarn walking speed and yarn stroke, wire tension sensor (10) are used for measuring the tension before yarn rubs with knitting needle (4), take-up side frame (1) is provided with wire take-up tension sensor (11), take-up positioning (12), wire guide ring (13), wire guide ring (14) are used for measuring yarn reciprocating tension sensor (14) and take-up yarn tension sensor (11) and take-up device after yarn reciprocating lead screw (3) take-up yarn tension sensor (11), yarn is led out from the yarn outlet device (2) and then sequentially passes through an outlet reciprocating screw rod (6), an outlet yarn guide ring (7), an outlet positioning roller (8), a speed sensor (9), an outlet tension sensor (10), a knitting needle (4), a take-up tension sensor (11), a take-up positioning roller (12), a take-up yarn guide ring (13), a take-up reciprocating screw rod (14) and a flying feather device (15) to be wound on the yarn take-up device (3).
2. The knitting needle yarn wear resistance testing device according to claim 1, wherein the yarn outgoing device (2) comprises an outgoing motor and an outgoing cylinder, the yarn winding device (3) comprises a winding motor and a winding cylinder, the outgoing motor and the winding motor are respectively used for driving the outgoing cylinder and the winding cylinder to rotate, and the outgoing motor and the winding motor are both servo motors.
3. The knitting needle yarn wear resistance testing device according to claim 1, wherein the outgoing line reciprocating screw rod (6) and the winding up reciprocating screw rod (14) are respectively and independently connected with a stepping motor, the stepping motor drives sliding blocks on the outgoing line reciprocating screw rod (6) and the winding up reciprocating screw rod (14) to reciprocate, and threading holes for penetrating yarns are formed in the sliding blocks of the outgoing line reciprocating screw rod (6) and the winding up reciprocating screw rod (14).
4. The knitting needle yarn wear resistance testing device according to claim 1, characterized in that a left guide wheel (1001), a detection wheel (1002) and a right guide wheel (1003) are sequentially arranged on the yarn outgoing tension sensor (10), a wheel shaft of the detection wheel (1002) is directly connected with the sensor elastic body, and the installation height of the detection wheel (1002) is slightly higher than that of the left guide wheel (1001) and the right guide wheel (1003).
5. A device for testing the wear resistance of a knitting needle yarn according to claim 1, characterized in that the speed sensor (9) comprises a metering wheel (901) and an encoder (902), the metering wheel (901) is coaxially connected with the encoder (902), and the encoder (902) outputs a fixed number of pulses per rotation of the metering wheel (901).
6. The device for testing the wear resistance of the knitting needle yarns according to claim 1, wherein the knitting needle clamping device (5) comprises an upper fixing plate (501), a lower fixing plate (502) and clamps (503), the upper fixing plate (501) and the lower fixing plate (502) which are arranged up and down are arranged on the frame, a plurality of clamps (503) are vertically arranged on the upper fixing plate (501) and the lower fixing plate (502) respectively, the clamps (503) on the upper fixing plate (501) are staggered with the clamps (503) on the lower fixing plate (502), each clamp (503) vertically clamps one knitting needle (4), yarns sequentially bypass the plurality of knitting needles (4) from left to right, and the outlet side yarn included angle and the take-up side yarn included angle of the knitting needles are adjusted by adjusting the installation distance between the upper fixing plate (501) and the lower fixing plate (502).
7. The method for testing the wear resistance of the knitting needle and the yarn is characterized by comprising the following steps of: Sequentially passing yarns through a yarn outgoing reciprocating screw rod (6), an outgoing yarn guide ring (7), an outgoing yarn positioning roller (8), a speed sensor (9), an outgoing yarn tension sensor (10), a knitting needle (4), a yarn receiving tension sensor (11), a yarn receiving positioning roller (12), a yarn receiving guide ring (13), a yarn receiving reciprocating screw rod (14) and a flying feather device (15) from a yarn outgoing device (2), winding the yarns to a yarn receiving device (3), wherein the width of a needle hook of the knitting needle (4) is D, the diameter of the yarns is R, the yarn outgoing yarn included angle beta and the yarn included angle theta of the receiving side of each knitting needle (4) are measured by using an angle gauge, the yarn outgoing device (2) and the yarn receiving device (3) are set to have the same initial torque T, the yarn initial tension F is adjusted through changing the torque T, the yarn outgoing yarn tension sensor (10) detects the yarn tension F1 before the yarns rub with the knitting needle, the yarn receiving tension sensor (11) detects the yarn tension F2 after rubbing the knitting needle, the speed sensor (9) detects the yarn outgoing yarn stroke S and the yarn receiving device (3) stops, and the yarn abrasion degree of the yarn receiving device (15) is detected; step 2, calculating positive pressure F n of yarn to the single knitting needle (4) according to the included angle beta of the yarn at the outgoing line side and the included angle theta of the yarn at the collecting line side, as well as the outgoing line tension F1 and the collecting line tension F2, and calculating the contact area A contact of the single knitting needle (4) and the yarn according to the hook width D and the yarn diameter R of the single knitting needle (4); Step 3, calculating according to the positive pressure F n of the yarn to the single knitting needle (4) and the contact area A contact of the single knitting needle (4) and the yarn to obtain the friction energy density e born by the single knitting needle (4) in unit contact area and unit sliding distance with the yarn, measuring the wear depth h of a needle hook by using a three-dimensional profilometer, a white light interferometer or a laser confocal microscope, and calculating according to the positive pressure F n of the yarn to the single knitting needle (4), the yarn stroke S and the wear depth h of the needle hook to obtain the needle hook wear coefficient K of the single knitting needle (4); And 4, calculating according to the friction energy densities e1 and e2. of the first group of multiple needles to obtain an average energy density e ', calculating according to the wear coefficients K1 and K2. of the needle hooks, calculating according to the Kn to obtain an average friction coefficient K', observing the wear condition of recorded yarns, replacing new yarns and the needles with different materials, performing a second group of tests, calculating according to the friction energy density e 1 1、e 1 2...e 1 n of the second group of multiple needles to obtain an average energy density e 1 ', calculating according to the wear coefficient K 1 1、K 1 2...K 1 n of the needle hooks to obtain an average wear coefficient K 1 ', continuously replacing new yarns and the needles with different materials, performing a plurality of groups of tests to obtain a plurality of average friction energy densities e ', e 1 '...e n ' and a plurality of average wear coefficients K ', K 1 '...K n ', comparing the average friction energy densities of the needles with different groups of the needles with different materials, judging the wear resistance and the service life of the needles with different materials, comparing the friction energy densities of the needles with the wear coefficients of the needles with the same position, and judging the wear resistance and the service life of the needles with different materials under the same conditions.
8. The method for testing the wear resistance of a yarn of a knitting needle according to claim 7, characterized by the steps of calculating the positive pressure F n of the yarn to the single knitting needle (4) and the contact area a contact of the single knitting needle (4) with the yarn as follows: Step 5.1 calculating the positive pressure F n of the yarn to the single needle (4), the positive pressure calculation formula when testing using only the single needle (4) is as follows: ; F n is the positive pressure of the yarn on the knitting needle (4); f1 is the tension detected by the wire tension sensor (10); F2 is the tension detected by the wire winding tension sensor (11); beta is the yarn included angle of the outlet side of the knitting needle (4); θ is the yarn included angle of the take-up side of the knitting needle (4); The friction force of the single knitting needle is calculated as follows: ; f is the friction force of the yarn against the needle: The yarn tension F1 and F2 calculated from the positive pressure calculation formula and the friction calculation formula are as follows: ; ; mu is the friction coefficient of the knitting needle and the yarn; the coefficient of friction μ can thus be calculated and the yarn tensions F1 and F2 at the test of n needles can be calculated as follows: ; ; and then the positive pressure F n of the single knitting needle is calculated in the test of n knitting needles, wherein the calculation formula is as follows: ; x is the number of knitting needles from the take-up end knitting needle to the knitting needle; And 5.2, calculating the contact area A contact of the single knitting needle (4) and the yarn, wherein the calculation formula is as follows: ; d is the thickness of the needle hook of the knitting needle (4); R is the yarn diameter.
9. A method for testing the wear resistance of a yarn of knitting needles according to claim 7, characterized by the step of calculating the friction energy density e and the hook wear coefficient K of the single knitting needle (4) as follows: step 6.1, calculating the friction energy density e, wherein the calculation formula is as follows: ; e is the friction energy density; W is the friction work of the yarn on the knitting needle (4); S is yarn travel; The friction work W is calculated as follows: ; The calculation formula for the friction work can be obtained as follows: ; the calculation formula for the friction energy density is as follows: ; And 6.2, calculating the hook abrasion coefficient K of the single knitting needle (4) based on the Archard abrasion law, wherein the calculation formula is as follows: ; H is the hardness of the needle hook material, and is measured by using a hardness tester.

Description

Knitting needle and yarn wear resistance testing device and method Technical Field The invention relates to the technical field of yarns, in particular to a device and a method for testing wear resistance of a knitting needle and yarns. Background The prior art such as CN117309658A, CN117589564A, CN213185766U and the like mainly has the defects that the existing tension detection device (such as CN 117589564A) is not definite in yarn end fixing, the yarn is easy to loose and deviate during detection, the friction contact state with a needle hook is unstable, the stress condition of actual abrasion of the needle hook cannot be accurately reflected, the abrasion difference of a plurality of groups of yarns on the needle hook is difficult to synchronously detect, the detection efficiency and pertinence are both insufficient, the transmission station of the existing reciprocating screw (such as CN 213185766U) is few, the guidance property and the stability are poor, the position deviation easily occurs in the yarn arranging process, the friction angle and acting force of the yarn and the needle hook deviate from the actual working condition, the actual abrasion process of the needle hook cannot be truly simulated, meanwhile, the existing detection device (such as CN 117309658A) is not integrated with a full-flow module of 'speed detection+double tension detection+friction work calculation', only partial data can not be singly acquired, the key information such as the speed and tension change when the yarn and the needle hook are abraded can not be synchronously acquired, the work calculation precision of the friction force corresponding to the needle hook is low, and the real mechanism of the needle hook is difficult to systematically analyze. In conclusion, the existing equipment cannot integrate stress, contact mode and motion state in the friction process of the yarn and the needle hook into an integrated work, and also does not meet the detection requirement of the actual abrasion process of the needle hook. The invention improves the defects, simulates the working mode of the yarn and the knitting needle in the actual working condition, and designs a knitting needle yarn wear resistance testing device. Disclosure of Invention The invention aims to solve the technical problem of providing a knitting needle and yarn wear resistance testing device and a method thereof, which can integrate stress, a contact mode and a motion state in the friction process of yarns and hooks and improve the wear detection efficiency of the knitting needle. The technical scheme for solving the technical problems is as follows: The utility model provides a knitting needle and yarn wear resistance testing arrangement, includes frame, yarn outgoing line device, yarn take-up device, knitting needle and knitting needle clamp get the device, be provided with the knitting needle clamp in the frame perpendicularly and get the device, the knitting needle clamp gets the device and is used for perpendicular a plurality of knitting needles of fixing, the frame is the outgoing line side and receive line side respectively with knitting needle clamp get the device as limit left and right sides, is provided with yarn outgoing line device, outgoing line reciprocating screw, outgoing line guide ring, wire location roller, speed sensor and outgoing line tension sensor in proper order from left to right in the outgoing line side frame, speed sensor is used for real-time detection yarn walking speed and yarn stroke, the outgoing line tension sensor is used for measuring the tension before yarn rubs with the knitting needle, is provided with receipts line tension sensor, receipts line location roller, receipts line guide ring, receipts line reciprocating screw, flying feather device and yarn receipts line device in proper order from left to right in the receipts line side frame, and is used for measuring the tension after yarn is worn with the knitting needle from left to right, and is passed through the reciprocating screw, goes out line guide ring, wire location roller, outgoing line location sensor, outgoing line position sensor, take-up feather sensor, take-up device, take-up line position sensor, winding yarn back and take-up device. Further, the yarn outgoing device comprises an outgoing motor and an outgoing drum, the yarn winding device comprises a winding motor and a winding drum, the outgoing motor and the winding motor are respectively used for driving the outgoing drum and the winding drum to rotate, and the outgoing motor and the winding motor are both servo motors. Further, the outgoing line reciprocating screw rod and the winding line reciprocating screw rod are respectively and independently connected with a stepping motor, the stepping motor drives sliding blocks on the outgoing line reciprocating screw rod and the winding line reciprocating screw rod to reciprocate, and the sliding blocks of the outgoing line reciprocating screw rod