CN112129441B

CN112129441B - Device and method for measuring yarn torque through free rotor

Info

Publication number: CN112129441B
Application number: CN202010841885.3A
Authority: CN
Inventors: 沈小林; 洪焱; 周思婕
Original assignee: Wuhan Textile University
Current assignee: Wuhan Textile University
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2021-11-23
Anticipated expiration: 2040-08-20
Also published as: CN112129441A

Abstract

The invention discloses a device and a method for measuring yarn torque through a free rotor, wherein the device comprises a box body, a computer assembly, a torque detection part and a fixing part, wherein the torque detection part and the fixing part are arranged in the box body; the torsion detection part comprises a rotor assembly and a photoelectric door sensor, one end of the rotor assembly is connected with yarns, the photoelectric door sensor is arranged on the side part of the rotor assembly and is in line connection with a circuit board fixed on a box body, and the photoelectric door sensor is used for acquiring the angular speed of the rotor assembly; the fixed part consists of a base, a lifting platform, a rotating shaft and a cross beam; the computer components are wired on the circuit board. Through the mode, the yarn can be punched and knotted on the rotor positioning piece and can freely droop, so that the torque can be fully released to drive the rotor to rotate, the photoelectric door sensor measures the rotating angle of the rotor and then obtains the torque force of the yarn through the analysis and the processing of the computer component which is connected to the circuit board through the wire, and the measurement precision is greatly improved.

Description

Device and method for measuring yarn torque through free rotor

Technical Field

The present invention relates to a detection device, in particular to a device and a method for measuring the torque of a yarn by means of a free rotor.

Background

At present, a plurality of single-stranded wires need to be twisted in the production process of the yarn, and when the strands are twisted to the surface fiber parallel state, the resultant torque of the whole strands is not zero; after the yarn is woven into the fabric, the fabric can generate skewness under the action of all yarn torques.

The skewness of weft is one of the mandatory detection indexes of the fabric quality, because the skewness of weft can seriously affect the cutting of fabrics and the appearance of clothes. Thus, the plant generally reduces the torque of the strands to a reasonable range by steaming the yarn for shaping, but does not eliminate it completely. However, in the actual production process, under the same yarn steaming condition, different batches of the same type (such as all cotton, red lines or black lines or white lines with the same nominal diameter) are not finally shaped, and the residual torque is different, some woven fabrics do not generate bias, some woven fabrics can generate left bias, and some woven fabrics can generate right bias, so that the strand twisting parameters of the products of the same type cannot be generalized.

In order to solve the above problems, it is preferable to use an instrument to directly measure the torque of the yarn, and to establish the relationship between the torque of the yarn and the skew of the weft of the fabric, thereby reducing the number of times to find the twist value to be applied to the yarn. There is also a close direct relationship between strand torque and individual yarn torque, and therefore the necessity to measure their torque. However, these materials have very little torsional stiffness and therefore require very sensitive spindle-type sensors for measurement, and only wide-range torque testing devices are currently available on the market. In addition, since these materials are resistant to stretching and shearing, the connection and fixation between the yarn or fiber material and the sensor can have a great influence on the accuracy of the test when the related torsion is tested, which is also a problem that is difficult to solve.

The prior art develops a yarn torsion detection device, which comprises a bottom plate arranged at the bottom of the inner side of a transparent box body, and a sliding door hinged with the side wall of the transparent box body; an electric control box is arranged on the bottom plate, two torsion detection assemblies are arranged on the top of the electric control box side by side and comprise a slide bar with scales, a yarn holder is arranged on the top of the slide bar, a shake-stopping ring is arranged on the bottom of the slide bar, two sensors are arranged on the electric control box and are positioned below the bottom of the slide bar; the electrical control box is provided with a decoding display, and the two sensors are connected with the decoding display; one end of the yarn is arranged on the yarn clamp holder, and the other end of the yarn passes through the shaking stop ring to be connected with the connecting rod. The method estimates the torque of the yarn by counting the number of self-twisting turns. The method is not accurate because of randomness of the size of each loop formation during self-twisting and the fact that a part of the torque of the yarn during loop formation needs to counteract the gravity of the lifting of the yarn loop chain, and can only be used as an empirical value for reference. It can also be seen from the unit (loop) of the index obtained in this way that it has no relation to the torque of the yarn.

Therefore, a yarn torque detection device with higher accuracy and more real and reliable data needs to be designed to meet daily detection requirements of yarn production enterprises.

Disclosure of Invention

In order to solve the problems of low detection precision, complex detection process and overhigh cost of the conventional yarn torque detection device, the invention provides the rotor with fixed rotary inertia.

In order to achieve the purpose, the invention adopts the technical scheme that:

the device for measuring the yarn torque through the free rotor comprises a box body, a computer assembly, a torsion detection part and a fixing part, wherein the torsion detection part and the fixing part are arranged in the box body; the torsion detection part comprises a rotor assembly and a photoelectric door sensor, one end of the rotor assembly is connected with yarns, the photoelectric door sensor is arranged on the side part of the rotor assembly and is in line connection with a circuit board fixed on a box body, and the photoelectric door sensor is used for acquiring the angular speed of the rotor assembly;

the rotor assembly comprises a turntable, a positioning piece, a rotor and magnetic metal sheets, wherein the rotor and the magnetic metal sheets are arranged on the upper side and the lower side of the turntable; the positioning piece penetrates through the magnetic metal sheet and the axis of the turntable and is fixedly connected with the rotor; one end of the yarn is connected with the positioning piece, and the other end of the yarn is connected with the fixing part;

an electromagnet is arranged right below the rotor, and the electromagnet is matched with the magnetic metal sheet to realize the state control of the rotation of the rotor.

Furthermore, a plurality of through grooves are formed in the circumferential direction of the rotary table, and are identified through the sensor to obtain the rotation angular speed of the yarn; a positioning piece is arranged above the rotary table, the top of the positioning piece is spherical, and a round hole is formed above the positioning piece.

Further, the fixed part comprises a base, a lifting platform, a rotating shaft and a cross beam, wherein the lifting platform is positioned on the base, and the cross beam is arranged on the upper part of the lifting platform and is rotationally connected with the lifting platform through the rotating shaft.

Furthermore, the beam is composed of a flip cover and a supporting plate, the flip cover is connected with the supporting plate through a clamping manner, a wire guide groove is formed in the middle of the flip cover and the supporting plate, a pulley is installed at the end part of the wire guide groove, a slotted hole is formed in one end of the flip cover, and a fixing ring is fixed on the supporting plate close to the slotted hole.

Furthermore, a sliding block is arranged on the outer side of the cross beam, the sliding block can slide along the axial direction of the cross beam, and a measuring scale is fixed above the sliding block.

Furthermore, the transmitting end and the receiving end on two sides of the photoelectric door sensor are vertically arranged, the photoelectric door sensor is arranged on the supporting frame on one side of the rotor, the turntable of the rotor is positioned in the light path area between the transmitting end and the receiving end of the photoelectric door sensor, and the supporting frame is fixed on the bottom plate.

Furthermore, the photoelectric door sensor is connected to the circuit board through a bottom wiring port line, the electromagnet line is connected to the circuit board, the circuit board is fixed to the inner side of the box body, the circuit board is connected to the rear side of a computer host arranged outside the box body through a single line, and the computer host is connected to the rear side of a computer display on the side.

Further, a method for measuring a yarn torque using the device for measuring a yarn torque by a free rotor comprises the following steps:

s1, tying the rotor assembly on the yarn and freely suspending the rotor assembly through a pulley;

s2, turning on the electromagnet, and keeping the rotor assembly in a static state under the action of the electromagnet;

s3, powering off the electromagnet and opening the photoelectric door sensor at the same time, wherein the rotor assembly starts to rotate under the action of the yarn;

and S4, synchronously recording the data fed back by the photoelectric gate sensor by the computer and fitting the data into a curve.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the device for measuring the yarn torque through the free rotor, the rotor with the fixed rotational inertia is designed, the rotor is provided with the aluminum alloy conical bottom, the rotational stability can be kept, errors in data acquisition are reduced, a rotating disc with a plurality of through grooves is additionally arranged above the rotor, sufficiently dense sampling points can be set, and the precision is improved.

2. According to the device for measuring the yarn torque through the free rotor, the yarn penetrates through the round hole in the rotor positioning piece to be knotted, is pulled through the pulley and then passes through the guide groove to be fixed at the fixing ring on the cross beam, the yarn is connected to one end of the rotor to freely droop, the torque can be fully released, and the detection precision is improved.

3. According to the device for measuring the yarn torque through the free rotor, when the yarn drives the rotor to rotate, the angle of rotation of the disc is measured through the photoelectric gate sensor, the coordinate graph of time and the angle of rotation of the yarn is made through analysis and fitting of a computer component, the relation between angular velocity and time, the relation between angular acceleration and time, and the relation between the angular acceleration and a rotation angle are further obtained, the initial acceleration can be obtained from a curve in the obtained coordinate graph, then according to a formula, the yarn torque M is equal to the angular acceleration rotational inertia, the corresponding torque is calculated, the accuracy of the initial angular acceleration obtained from the curve directly is high, and the measured torque is more accurate.

Drawings

FIG. 1 is a schematic diagram of the general structure of the present invention;

FIG. 2 is a schematic view of the detection portion of the present invention mounted thereon;

FIG. 3 is a schematic view of a rotor structure of the present invention;

FIG. 4 is a cross-sectional view of the cross-beam assembly of the present invention;

fig. 5 to 8 are graphs showing the detection results of the yarn 1 of the twist 800;

fig. 9 to 12 are graphs showing the results of detection of the yarn 2 having the twist 680;

fig. 13 to 16 are graphs showing the detection results of the yarn 3 of the twist 400;

the parts in the drawings are numbered as follows: 1. a box body; 2. a rotating shaft; 3. a lifting platform; 4. a base; 5. a sensor; 6. a support frame; 7. a cross beam; 8. measuring a ruler; 9. a yarn; 10. a rotor; 101. a circular hole; 102. a gasket; 103. a magnetic metal sheet; 104. a positioning member; 105. a turntable; 11. an electromagnet; 12. a pulley; 13. a wire guide groove; 14. a display; 15. a host; 16. a circuit board; 17. and (4) fixing the ring.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

Examples

Referring to fig. 1 to 3, the device for measuring yarn torque through a free rotor of the present invention includes a case 1, a computer assembly, and a torque detecting part and a fixing part disposed in the case 1, wherein the torque detecting part and the fixing part are fixed together, the torque detecting part is composed of a rotor 10 with fixed moment of inertia and a sensor 5, a yarn 9 is knotted through a circular hole 101 of a positioning member 104, pulled by a pulley 12 at the top end of a cross beam 7 and fixed on a fixing ring through a wire guide 13, and a photo-electric gate sensor 5 is disposed at one side of the rotor 10 to measure the angular velocity of the rotor assembly during rotation.

The box body 1 is a transparent glass box, so that the inside detection condition can be observed in real time conveniently, a rotating door is arranged on one side, opening and closing are facilitated, the airtightness of the detection device is guaranteed, the influence of the external environment is avoided, and stable work of the detection device is guaranteed.

As shown in fig. 2, the fixing component is composed of a base 4, a lifting platform 3, a rotating shaft 2 and a cross beam 7, the lifting platform 3 is located on the base 4, openings are formed in two sides above the lifting platform 3, and the rotating shaft 2 penetrates through the openings with the same size in the cross beam 7 after passing through the openings to rotatably connect the lifting platform 3 and the cross beam 7.

An electric push rod is arranged at the lower end of the lifting platform 3 to push the lifting platform 3 to move up and down, and the cross beam 7 can rotate around the rotating shaft 2 to adjust the length of the drooping part of the yarn 9 to be detected.

As shown in fig. 2, the beam 7 is composed of a flip cover and a supporting plate, a central position of a joint is provided with a wire guide groove 13 for the yarn 9 to pass through, the flip cover and the supporting plate are fixed in a clamping manner, when the yarn passes through, the flip cover is opened, and when the yarn is fixed on the rear cover of the fixing ring, the flip cover is covered.

Wherein, a round pulley 12 is installed at an outer end of the yarn guide groove 13 to facilitate traction of the yarn 9 tied on the rotor 10 and to prevent abrasion of the yarn 9 at the groove opening.

The utility model discloses a yarn measuring device, including crossbeam 7, slider, measuring tape 8, crossbeam 7 below both sides are provided with the boss slide rail, have placed the slider on it, the slider can move along crossbeam 7 axis on the slide rail, the slider top is fixed with vertical measuring tape 8 of placing, moves the length of crossbeam 7 outside measurement yarn 9 before rotor 10 rotates, moves crossbeam 7 inboard when rotor 10 rotates in order not to influence the rotation.

As shown in fig. 3, rotor 10 has fixed inertia, and rotor 10 adopts the aluminum alloy toper end, and the windage that receives when the material is light and handy and rotate is less, can keep rotational stability, and error when reducing data acquisition adds a carousel 105 of opening a plurality of logical grooves in circumference above rotor 10, and the notch is the cockscomb structure, can set up sufficient density's sampling point, improves the sampling precision.

A positioning element 104 is arranged above the turntable 105, and the positioning element 104 penetrates through the magnetic metal sheet 103 and the axis of the turntable 105 and is fixedly connected with the rotor 10; one end of the yarn 9 is connected with the positioning piece 104, the other end of the yarn 9 is connected with the fixing part, the top of the positioning piece 104 is designed into a sphere, a round hole 101 is formed in the top of the positioning piece, the yarn 9 penetrates through the round hole 101 to be knotted right above the round hole 101, the round hole 101 is formed in a position close to the top of the sphere along the axial surface of the top as far as possible, and the stability of the rotor 10 after knotting is guaranteed.

The inertia moment of the rotor 10 can be adjusted by increasing or decreasing the magnetic metal sheet 103 to adapt to different yarns 9, so that the detection range of the invention is expanded.

In this embodiment, a square electromagnet 11 is disposed just below the rotor 10, and the electromagnet 11 and the magnetic metal sheet 103 cooperate to control the rotation state of the rotor 10.

The photoelectric door sensor 5 is vertically arranged at the transmitting end and the receiving end which are positioned at two sides, the photoelectric door sensor 5 is arranged on the supporting frame 6 at one side of the rotor 10, the turntable 105 of the rotor 10 is positioned in the light path area between the transmitting end and the receiving end of the photoelectric door sensor 5, when the turntable 105 rotates, the turntable 105 can discontinuously shield the light path, and the supporting frame 6 is fixed on the bottom plate.

The photoelectric door sensor 5 is connected to a circuit board 16 through a single wiring port line at the bottom, the electromagnet 11 is connected to the circuit board 16 through a single wiring line, the circuit board 16 is fixed to the inner side of the box body 1, the circuit board 16 penetrates through the box body 1 to be connected to the rear side of a computer host 15 placed outside the box body 1 through a single wiring line, and the computer host 15 is connected to the rear side of a computer display 14 on the side.

Wherein, a computer component sends out an instruction, the instruction is transmitted to a circuit board 16 connected with the host 15 through the host 15, after the circuit board 16 receives the instruction, the circuit board 16 transmits the instruction to a photoelectric gate sensor 5 and an electromagnet 11 connected with the circuit board 16 respectively, after the electromagnet 11 is powered off under the action of the instruction, a rotor 10 freely rotates under the action of the torque of a yarn 9, the photoelectric gate sensor 5 starts synchronous counting, the photoelectric gate sensor 5 counts the rotating angle of a rotating disc 105, a coordinate graph of the time and the rotating angle of the yarn is made, the relation between the angular velocity and the time, the relation between the angular acceleration and the time, and the relation between the angular acceleration and the rotating angle are obtained through fitting analysis of the computer component, an initial acceleration can be obtained from a curve in the obtained coordinate graph, and then according to a formula, the yarn torque M is the angular acceleration and the rotational inertia, calculating corresponding torque, wherein the rotational inertia of the rotor is 3.81 × 10^-7Kg.m²The initial angular acceleration obtained directly from the curve has a high accuracy value, and the measured torque is more accurate.

As shown in fig. 4 to 15, the yarn 1 with twist 800, the yarn 2 with twist 680, and the yarn 3 with twist 400 were tested separately by this embodiment, and respective curves of yarn radian and time, yarn angular velocity and time, yarn angular acceleration and time, and yarn angular acceleration and radian were plotted, and the initial yarn angular acceleration can be directly obtained from the final yarn angular acceleration and time relationship curve and the yarn angular acceleration and radian relationship curve, and both numerical values thereofAs such. Wherein the angular acceleration of yarn 1 is 0.94(rad/s 2), the angular acceleration of yarn 2 is 1.82(rad/s 2), and the angular acceleration of yarn 3 is 1.89(rad/s 2). The torque force of the torque sensor is calculated to be 3.58 multiplied by 10 by substituting the torque sensor into the formula^-7Nm，6.93×10^-7Nm，7.20×10^-7Nm。

The types and various parameters of the detection yarns are shown in the following table:

according to the device for measuring the yarn torque through the free rotor, one end of the yarn penetrates through a round hole in a rotor positioning piece with fixed rotary inertia, the yarn is pulled through a pulley after knotting and is fixed on a fixing ring through a wire guide groove, sliding blocks on two sides of a movable cross beam measure the length of the vertical yarn through measuring rulers, a lifting table and the cross beam are adjusted to adjust the length of the freely falling yarn, after the rotor is stable in the air, an electromagnet below the rotor is powered off, the rotor starts to rotate under the torque action of the yarn, a rotary disc on the rotor passes through a photoelectric door sensor on the side, the photoelectric door sensor obtains a time and yarn radian coordinate graph through counting, and the final torque is obtained through analysis and calculation of a computer component. Compared with the conventional device for measuring the yarn torsion, the device is more stable and accurate, is simpler and more convenient to manufacture, and has considerable market prospect and economic benefit.

The above description is only for the purpose of illustrating the technical solutions of the present invention and is not intended to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; all the equivalent structures or equivalent processes performed by using the contents of the specification and the drawings of the invention, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A device for measuring the torque of a yarn by a free rotor, characterized in that it comprises a case (1), a computer assembly and a torque detection part, a fixing part arranged in the case (1); the torsion detection part comprises a rotor assembly and a photoelectric door sensor (5), one end of the rotor assembly is connected with yarns, the photoelectric door sensor (5) is arranged on the side of the rotor assembly, and the photoelectric door sensor (5) is used for acquiring the angular speed of the rotor assembly;

the rotor assembly comprises a rotary disc (105), a positioning piece (104), a rotor (10) and a magnetic metal sheet (103), wherein the rotor (10) and the magnetic metal sheet are arranged on the upper side and the lower side of the rotary disc (105); the positioning piece (104) penetrates through the magnetic metal sheet (103) and the axis of the rotary disc (105) and is fixedly connected with the rotor (10); one end of the yarn (9) is connected with the positioning piece (104), and the other end of the yarn is connected with the fixing part;

an electromagnet (11) is arranged right below the rotor (10), and the electromagnet (11) is matched with the magnetic metal sheet (103) to control the rotating state of the rotor (10).

2. Device for measuring the torque of a yarn by means of a free rotor according to claim 1, characterised in that said rotating disc (105) is provided, in its circumferential direction, with a plurality of through slots identified by said photo-electric gate sensor (5) to obtain the angular speed of rotation of said yarn; a positioning piece (104) is arranged above the turntable (105), the top of the positioning piece (104) is spherical, and a round hole (101) is formed above the positioning piece.

3. Device for measuring the torque of a yarn by means of a free rotor according to claim 1, characterized in that said fixed part comprises a base (4), a lifting table (3), a rotating shaft (2) and a cross-beam (7), said lifting table (3) being positioned above said base (4), said cross-beam (7) being arranged above said lifting table (3) and being rotatably connected to said lifting table (3) by means of said rotating shaft (2).

4. The device for measuring the yarn torque through the free rotor as recited in claim 3, characterized in that the beam (7) is composed of a flip cover and a supporting plate, the flip cover and the supporting plate are connected through a clamping connection, a wire guide groove (13) is formed in the middle position of the flip cover and the supporting plate, a pulley (12) is installed at the end of the wire guide groove (13), a slotted hole is formed in one end of the flip cover, and a fixing ring (17) is fixed on the supporting plate close to the slotted hole.

5. Device for measuring the torque of a yarn by means of a free rotor according to claim 3, characterised in that outside the cross beam (7) there are provided sliding blocks which are axially slidable along the cross beam (7), above which a measuring tape (8) is fixed.

6. Device for measuring the torque of a yarn by means of a free rotor according to claim 5, characterised in that the photoelectric door sensor (5) is placed vertically on both sides of the emitting end and the receiving end, the photoelectric door sensor (5) is placed on a support frame (6) on one side of the rotor (10), the rotating disc (105) of the rotor (10) is located in the light path area between the emitting end and the receiving end of the photoelectric door sensor (5), and the support frame (6) is fixed on the bottom plate.

7. Device for measuring the torque of a yarn by means of a free rotor according to claim 6, characterised in that the photoelectric gate sensor (5) is wired on a circuit board (16) by means of a bottom wire connection, the electromagnet (11) is wired on the circuit board (16), the circuit board (16) is fixed inside the cabinet (1), the circuit board (16) is single-wired on the rear side of a computer host (15) placed outside the cabinet (1), the computer host (15) is wired on the rear side of a computer display (14) placed on the side.

8. A method for measuring the torque of a yarn using the device according to claim 1, characterized in that it comprises the following steps:

s1, tying the rotor assembly on the yarn and freely suspending the rotor assembly through a pulley (12);

s2, turning on the electromagnet (11), and keeping the rotor assembly in a static state under the action of the electromagnet (11);

s3, powering off the electromagnet (11) and simultaneously opening the photoelectric door sensor (5), wherein the rotor assembly starts to rotate under the action of the yarn;

and S4, synchronously recording the data fed back by the photoelectric door sensor (5) by the computer and fitting the data into a curve.