阅读说明：本技术 纱线的捻度校正方法 (Method for correcting twist of yarn ) 是由 郭峰 于 2020-06-20 设计创作，主要内容包括：本发明公开了一种纱线的捻度校正方法,钢令圈沿锭子由上而下移动,通过电机控制锭子匀加速转动,通过速度的增加补偿纱线的捻度的变化；钢令圈沿锭子由下而上移动,通过电机控制锭子匀加减转动,通过速度的减少补偿纱线的捻度的变化；能够实现生产的纱线捻度均匀,纱线的质量更好。(The invention discloses a twist correction method of yarn, wherein a steel ring moves from top to bottom along a spindle, the spindle is controlled to rotate at a uniform acceleration by a motor, and the change of the twist of the yarn is compensated by the increase of the speed; the steel ring moves from bottom to top along the spindle, the motor controls the spindle to uniformly rotate in an up-and-down mode, and the change of the twist of the yarn is compensated through the reduction of the speed; the yarn twist produced is uniform, and the quality of the yarn is better.)

1. A method for correcting the twist of a yarn, characterized by:

the steel ring moves from top to bottom along the spindle, the spindle is controlled by a motor to rotate at a uniform acceleration, and the change of the twist of the yarn is compensated by the increase of the speed;

the steel ring moves from bottom to top along the spindle, the motor controls the spindle to uniformly rotate in an up-and-down mode, and the change of the twist of the yarn is compensated through the reduction of the speed;

the yarn wound on the spindle is uniform in twist.

2. A twist correction method for a yarn according to claim 1, characterized in that:

acquiring a lower limit signal of the stroke of the steel ring, judging that the steel ring is at a lower limit position, and sending the lower limit signal to a PLC control system; when the lower limit position is reached, the steel ring moves from bottom to top, the PLC control system sends a compensation signal to the motor drive, and the motor drive controls the motor so as to control the uniform speed reduction rotation of the spindle.

3. A twist correction method for a yarn according to claim 2, characterized in that:

acquiring an upper limit signal of the stroke of the steel ring, judging that the steel ring is at an upper limit position, and sending the upper limit signal to a PLC control system; when the upper limit position is reached, the steel ring moves from top to bottom, the PLC control system sends a compensation signal to the motor drive, and the motor drive controls the motor so as to control the uniform acceleration rotation of the spindle.

4. A twist correction method for a yarn according to claim 3, characterized in that:

and a rotating speed compensation formula is stored in the PLC control system, and the constant-speed change of the rotating speed of the spindle is controlled according to the change rule of the rotating speed compensation formula.

5. A twist correction method for a yarn according to claim 4, characterized in that: and controlling the rotating speed of the spindle to increase or decrease delta V at intervals of T1 through the rotating speed compensation formula.

6. A twist correction method for a yarn according to claim 5, characterized in that: the T1 is 0.2S, and the Delta V is 2.54 rad.

7. A twist correction method for a yarn according to claim 2 or 3, characterized in that: the PLC control system sends the compensation signal to the motor drive, and the motor drive receives the compensation signal, calculates the compensation signal through a single chip microcomputer of the driver, converts the compensation signal into a PID (proportion integration differentiation) numerical value and transmits the PID numerical value to the motor in real time.

8. A twist correction method for a yarn according to claim 1, characterized in that: and inputting a standard value of the spindle rotating speed to the PLC control system.

9. A twist correction method for a yarn according to claim 8, characterized in that: the standard value of the spindle rotating speed is a value without rotating speed compensation.

10. A twist correction method for a yarn according to claim 1, characterized in that: the maximum effective twisting distance and the minimum effective twisting distance of the yarn are fixed values.

Technical Field

The invention relates to the technical field of yarns, in particular to a twist correction method of yarns.

Background

The yarn, especially chenille yarn, is a new kind of fancy yarn, it uses two ply yarn as the core, through twisting the feather yarn is sandwiched in the middle to spin and make, chenille yarn because its eiderdown is plump, soft hand feeling, the fabric is thick and light and graceful characteristics, is widely used in the family and spins and the knitted dress field, form the new bright point of the product development.

However, since chenille yarn can be used for indoor decoration such as a slip cover, a bed blanket, a table carpet, a wall decoration, and a curtain, but cannot be used for manufacturing clothes, it is difficult to manufacture clothes due to uneven twist and uneven dyeing in the manufacturing process of chenille yarn.

Referring to fig. 1, in the spinning process, the down-spun yarn is composed of two or three single yarns, and the single yarns are unwound from the bobbin and twisted with the high-speed rotation of the turret head 100, thereby increasing the convergence of the down-spun yarn; and meanwhile, the yarn is wound on the gauge slice to form a yarn loop, the yarn loop slides downwards along with the rotation of the roller-type zipper 200, the yarn loop is cut into short feathers when meeting the cutter blade, and the short feathers are sent to the control roller together with the upper core wire and are converged with the lower core wire.

The down is clamped between the two core wires and enters the twisting area, the core wires are twisted rapidly along with the high-speed rotation of the spindle 300, and the twisted core wires and the down are firmly combined together to form the chenille yarn with plump down; and simultaneously wound on a bobbin to form a tubular yarn.

Twisting refers to the number of turns of the core thread wound around the wool within a meter of length, with the twist being affected by distance at a fixed rotational speed.

In the process of twisting the chenille yarn, the steel ring 400 moves up and down along the spindle in a reciprocating manner, so that the chenille yarn is uniformly wound on the bobbin.

Referring to fig. 2-3, because the bobbin is long tubular, the steel ring moves to the top of the spindle and is closest to the roller, and the steel ring moves to the bottom of the spindle and is farthest from the roller because the yarn outlet height of the roller is fixed in the process of moving the steel ring up and down along the spindle; then, at the same rotation speed of the spindle, the twist of the yarn a is the largest when the steel ring 400 moves to the high position of the spindle (the twist is large at the same rotation speed when the distance is short), and the twist of the yarn B is the smallest when the steel ring 400 moves to the bottom of the spindle 300 (the twist is small at the same rotation speed when the distance is long).

Thus, the twist of the yarn is repeated from big to small and from small to big, so that the twist of the yarn is actually uneven and has different thicknesses, and the color difference, the color depth with big twist and the color depth with small twist, the toughness and the like of the yarn are all inconsistent when the yarn is dyed during the clothes making process.

Therefore, the problem that the twist of the chenille yarn is not uniform and uniform in the manufacturing process is to be solved urgently.

Disclosure of Invention

In view of the above, the present invention provides a twist correction method for a yarn,

in order to achieve the purpose, the invention adopts the following technical scheme: the twist correction method of the yarn, the steel ring moves from top to bottom along the spindle, the spindle is controlled by a motor to rotate at a uniform acceleration, and the change of the twist of the yarn is compensated by the increase of the speed; the steel ring moves from bottom to top along the spindle, the motor controls the spindle to uniformly rotate in an up-and-down mode, and the change of the twist of the yarn is compensated through the reduction of the speed; the yarn wound on the spindle is uniform in twist.

In the further method, a lower limit signal of the stroke of the steel ring is obtained, the steel ring is judged to be at the lower limit position, and the lower limit signal is sent to the PLC control system; when the lower limit position is reached, the steel ring moves from bottom to top, the PLC control system sends a compensation signal to the motor drive, and the motor drive controls the motor so as to control the uniform speed reduction rotation of the spindle.

In the further method, an upper limit signal of the stroke of the steel ring is obtained, the steel ring is judged to be at the upper limit, and the upper limit signal is sent to the PLC control system; when the upper limit position is reached, the steel ring moves from top to bottom, the PLC control system sends a compensation signal to the motor drive, and the motor drive controls the motor so as to control the uniform acceleration rotation of the spindle.

In a further method, a rotating speed compensation formula is stored in the PLC control system, and the constant-speed change of the rotating speed of the spindle is controlled according to the change rule of the rotating speed compensation formula.

In a further method, the rotating speed of the spindle is controlled to increase or decrease Δ V at intervals of T1 by the rotating speed compensation formula.

In a further method, said T1 is 0.2S and Δ V is 2.54 rad.

In a further method, the PLC control system sends the compensation signal to the motor drive, and the motor drive receives the compensation signal, calculates the compensation signal through a single chip microcomputer of the driver, converts the compensation signal into a PID (proportion integration differentiation) numerical value and transmits the PID numerical value to the motor in real time.

In a further method, a standard value of the spindle rotating speed is input into the PLC control system.

In a further method, the standard value of the spindle rotational speed is a value without rotational speed compensation.

In a further method, the maximum effective twisting distance and the minimum effective twisting distance of the yarn are constant values

According to the technical scheme, compared with the prior art, the invention has the following beneficial technical effects:

when the yarn moves downwards, the problem that the motor runs uniformly and quickly and the compensation twist is reduced continuously is solved through the spindle motor by software; when the yarn moves upwards, the problem that the motor uniformly decelerates to run and compensate the twist degree to be continuously increased is solved through a spindle motor by software; the yarn twist produced is uniform, and the quality of the yarn is better.

According to the invention, through a power-off memory method, the current running state is instantly memorized after power-off, and the running is continued according to the state during power-off after power-on.

Other advantages of the present invention are apparent from the detailed description.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a general block diagram of a prior art chenille yarn machine;

FIGS. 2 and 3 are graphs of yarn twist at different positions of the steel rings at speed;

FIG. 4 is a flow chart of the present invention.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

In the description of the present application, it is to be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present application. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The twist correction method of the yarn, in the course of twisting, the particular position of winding wire while the spindle is winding the yarn is unfixed, its position is changed following the up-and-down movement of the steel looper, and the position of the roller is fixed, then, the maximum effective twisting distance and minimum effective twisting distance of the yarn are the definite value; the maximum effective twisting distance is from the position of the roller to the lower limit of the steel ring operation, and the minimum effective twisting distance is from the position of the roller to the upper limit of the steel ring operation. The steel ring moves up and down to cause different twisting distances, so the problem of twist change caused by distance change is compensated by controlling the uniform acceleration rotation and the uniform deceleration rotation of the spindle.

When the steel ring moves from top to bottom along the spindle, the motor controls the spindle to rotate at a uniform acceleration speed, and the problem of continuous reduction of twist is compensated by the uniform acceleration rotation of the spindle;

when the steel ring moves from bottom to top along the spindle, the motor controls the uniform speed reduction rotation of the spindle, and the problem of the continuous increase of the twist is compensated by the uniform speed reduction rotation of the spindle.

As shown in fig. 4, in the figure,

specifically, a standard value N of the spindle rotating speed is set, and the standard value N is free of rotating speed compensation data; the standard value N is set according to the actual demand and yield of a customer, can be input and set through a touch screen, and is transmitted to the PLC control system after being set.

A rotating speed compensation formula X is stored in the PLC control system, and the constant speed change of the rotating speed of the spindle is controlled according to the change rule of the rotating speed compensation formula X; the rotating speed compensation formula X is that the rotating speed of the spindle is controlled to increase or decrease delta V every T1 time; t1 and Δ V may be set arbitrarily as needed, or may be fixed values.

In the present embodiment, when the rotation speed compensation formula X is fixed, T1 and Δ V are fixed values, T1 is 0.2S, and Δ V is 2.54 rad.

Namely: during acceleration compensation, the spindle is controlled to uniformly accelerate in a mode of uniformly increasing the rotating speed by 2.54rad every 0.2S;

during deceleration compensation, the spindle is controlled to uniformly decelerate every 0.2S by 2.54rad of uniform deceleration.

The motor of the spindle is required to be triggered by signals for acceleration compensation or deceleration compensation,

acquiring a lower limit signal of the stroke of the steel ring, judging that the steel ring is at a lower limit position, and sending the lower limit signal to a PLC control system, wherein when the steel ring is at the lower limit position, the steel ring moves from bottom to top, and at the moment, the PLC control system controls the spindle to uniformly decelerate and rotate;

and acquiring an upper limit signal of the stroke of the steel ring, judging that the steel ring is at an upper limit position, and sending the upper limit signal to the PLC control system, wherein when the upper limit position is reached, the steel ring moves from top to bottom, and the PLC control system controls the spindle to rotate at an accelerated speed uniformly.

The acquisition of the upper limit signal and the lower limit signal can be acquired by a sensor, and when the steel ring moves to the upper limit position, the sensor at the upper end is triggered to send the upper limit signal to the PLC control system; when the steel ring moves to the lower limit position, triggering a sensor at the lower end, and sending a lower limit signal to the PLC control system;

in another embodiment, the above-mentioned upper limit signal and the lower limit signal may be obtained by: and the PLC control system acquires a lower limit signal of the steel ring through a sensor at the lower end. The PLC control system obtains upper limit data through an internally arranged uplink period; specifically, the ascending period T is set according to the requirements of clients, the steel ring moves from top to bottom and from bottom to top at a constant speed, the lower limit signal is obtained through a sensor at the lower end, the moving time from bottom to top is the ascending period T, the upper limit signal is sent after the counting time reaches the ascending period T, and the PLC control system obtains the upper limit signal.

In a further control mode, after receiving the upper limit signal or the lower limit signal, the PLC control system sends a compensation signal (namely a compensated rotating speed value Delta V) to the motor drive, after receiving the compensation signal, the motor drive calculates through a single chip microcomputer of the driver and converts the compensation signal into a PID value, the PID value is transmitted to the motor in real time, and the motor performs uniform acceleration or uniform deceleration on the basis of the original rotating speed.

The control method of the present invention is further explained below:

s01: inputting a standard value N of a spindle motor according to the requirement of a customer;

s02: when the steel ring is at the upper limit position, the rotating speed is N, a sensor at the upper end is triggered, the sensor at the upper end sends an upper limit signal to a PLC control system, and the PLC control system sends a compensation signal to a motor drive;

s03: the steel ring moves from top to bottom, and the rotation speed at fixed time is uniformly decelerated to run in a mode of uniformly decelerating the rotation speed by 2.54rad every 0.2S on the basis of N;

s04: when the steel ring runs to the lower limit, triggering a sensor at the lower end, wherein the real-time rotating speed is N', the sensor at the lower end sends a lower limit signal to a PLC control system, and the PLC control system sends a compensation signal to a motor drive;

s05: the steel ring moves from bottom to top, and the regular rotating speed is uniformly accelerated to run in a mode of uniformly accelerating the rotating speed by 2.54rad every 0.2S on the basis of N';

s06: when the steel ring runs to the upper limit, triggering a sensor at the upper end, sending an upper limit signal to a PLC control system by the sensor at the upper end, and sending a compensation signal to a motor drive by the PLC control system;

s07: and repeating the steps S02-S05 and repeating the operation.

Through the mode, the change of the twist degree caused by the change of the twisting distance is compensated through the control of the rotating speed, and the uniformity of the twist degree of the yarn is ensured.

In a further control mode, a PLC control system is provided with a power-off memory function, current running speed, time and other parameters are recorded after power-off, and the PLC control system continues to run according to the memorized parameters after power-on again.

Finally, the invention is not only used for the twist control problem of chenille yarn, but also can be used for the twist correction of other textiles in the textile industry.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.