阅读说明：本技术 一种成组保持纤维纱线张力的方法及系统 (Method and system for maintaining fiber yarn tension in groups ) 是由 谈源 陈玉祥 刘勇俊 钮青 于 2020-12-04 设计创作，主要内容包括：本发明涉及纤维纱线张力控制技术领域,具体涉及一种成组保持纤维纱线张力的方法,包括以下步骤：将一组电机通过同一个三相调压器进行供电；计算放卷辊筒的实时卷径；根据纱线所需的张力和实时卷径计算电机的所需输出电压；通过三相调压器调节一组电机的输出电压至所需输出电压。本发明中通过同一个三相调压器对一组电机进行电压控制,使得该组内的电机在相同的纱线张力下输出所需输出电压,且电压随纱筒卷径而实时变化,有效的保证了多股纱线张力的一致性和稳定性,将上述方法作用于一束扁状丝时,可保证该丝束内无缝隙,保证最终织物的质量。同时本发明中还请求保护一种成组保持纤维纱线张力的系统,具有同样的技术效果。(The invention relates to the technical field of tension control of fiber yarns, in particular to a method for maintaining tension of fiber yarns in groups, which comprises the following steps: a group of motors are supplied with power through the same three-phase voltage regulator; calculating the real-time roll diameter of the unwinding roller; calculating the required output voltage of the motor according to the required tension and the real-time winding diameter of the yarn; the output voltage of a group of motors is regulated to the required output voltage through a three-phase voltage regulator. The invention controls the voltage of a group of motors by the same three-phase voltage regulator, so that the motors in the group output the required output voltage under the same yarn tension, and the voltage changes in real time along with the winding diameter of a yarn drum, thereby effectively ensuring the consistency and stability of the tension of a plurality of strands of yarns. Meanwhile, the invention also claims a system for maintaining the tension of the fiber yarns in groups, which has the same technical effect.)

1. A method of maintaining tension in groups of fiber yarns, comprising the steps of:

a group of unwinding motors are powered by the same three-phase voltage regulator;

calculating the real-time roll diameter of the unwinding roller;

calculating the required output voltage of the motor according to the tension required by the yarn and the real-time winding diameter;

and adjusting the output voltage of the motor to the required output voltage through the three-phase voltage regulator.

2. A method for maintaining group tension of fibre yarns according to claim 1, characterised in that the required output voltage is calculated as follows:

wherein the content of the first and second substances,

u is the required output voltage of the motor and has the unit of V;

f is the tension value required by the yarn, and the unit is N;

r is the real-time roll diameter of the unwinding roller and the unit is m;

k and b are constants.

3. Group hold down fiber yarn tension according to claim 1 or 2, wherein the real winding diameter of the unwinding roller is calculated by the linear speed of the yarn and the number of revolutions of the motor per unit time.

4. The method for maintaining tension of grouped fiber yarns according to claim 3, wherein the real-time roll diameter calculation formula of the unwinding roller is as follows:

wherein the content of the first and second substances,

r is the real-time coil diameter and the unit is m;

v is the linear velocity of the yarn, and the unit is m/s;

n is the number of revolutions in the motor 1 s.

5. The method of maintaining tension in groups of fiber yarns according to claim 1, further comprising the steps of:

and detecting each phase voltage of the three-phase voltage regulator, taking the average value of the three-phase voltage effective values as a control voltage, and adjusting the output voltage according to the comparison result of the control voltage and the required output voltage.

6. A system for maintaining tension in groups of fiber yarns, comprising:

the motors are arranged in one-to-one correspondence to the yarn unwinding rollers and provide rotating power for the unwinding rollers;

the three-phase voltage regulator is connected with a group of motors to be controlled;

the unwinding roller measuring unit is used for acquiring parameters for calculating the winding diameter of the unwinding roller;

the controller is used for calculating the required output voltage of the motor according to the required tension of the yarn and the parameters;

and the three-phase voltage regulator controls the output voltage of a group of motors according to the required output voltage.

7. A system for maintaining tension in groups of fibre yarns according to claim 6, characterised in that the required output voltage is calculated as follows:

wherein the content of the first and second substances,

u is the required output voltage of the motor and has the unit of V;

f is the tension value required by the yarn, and the unit is N;

r is the real-time roll diameter of the unwinding roller and the unit is m;

k and b are constants.

8. A group maintaining fiber yarn tension system according to claim 6 or 7, further comprising a motor revolution number collecting unit collecting the number of revolutions of the motor per unit time, comprising:

the magnet is fixed on a rotating shaft of the motor and synchronously rotates along with the motor;

the induction element is fixedly arranged and induces the number of rotation turns of the magnet;

the magnetic rotary encoder controls the accurate range of the number of turns through the self accuracy;

and the magnetic rotary encoder chip calculates the number of turns according to the induction result and the precision range.

9. The system for maintaining tension in groups of fiber yarns as in claim 8, wherein the real-time roll diameter calculation formula of the unwinding roller is as follows:

wherein the content of the first and second substances,

r is the real-time coil diameter and the unit is m;

v is the linear velocity of the yarn, and the unit is m/s;

n is the number of revolutions in the motor 1 s.

10. The system for maintaining tension in groups of fiber yarns of claim 6 further comprising a voltage detection module for detecting single phase voltage and the detection result is used for adjustment of the output voltage.

Technical Field

The invention relates to the technical field of fiber yarn tension control, in particular to a method and a system for maintaining fiber yarn tension in groups.

Background

The carbon fiber production line needs warping before weaving, needs put yarn, collection yarn, exhibition fine, heating, several processes of twining to the carbon fiber yarn, warp single yarn into the flat silk of certain width to form an organic whole with other yarns, the better semi-manufactured goods of shaping uniformity, from the aspect of quality control requirement flat silk in the middle of can not have the gap. In order to meet the requirements, in the process of yarn unwinding in the first process, the yarns need to be kept at uniform tension, and in the actual control process, the consistency stability control difficulty of the tension of the yarns is large due to the real-time change of the winding diameter of the yarn drum.

In view of the above problems, the present designer is based on the practical experience and professional knowledge that are abundant for many years in engineering application of such products, and is engaged with the application of theory to actively make research and innovation, so as to create a method and a system for maintaining the tension of fiber yarns in groups, so that the method and the system are more practical.

Disclosure of Invention

The invention provides a method and a system for maintaining the tension of fiber yarns in groups, which effectively solve the problems in the background technology.

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

a method of maintaining tension in groups of fiber yarns, comprising the steps of:

a group of unwinding motors are powered by the same three-phase voltage regulator;

calculating the real-time roll diameter of the unwinding roller;

calculating the required output voltage of the motor according to the tension required by the yarn and the real-time winding diameter;

and adjusting the output voltage of the motor to the required output voltage through the three-phase voltage regulator.

Further, the calculation formula of the required output voltage is as follows:

wherein the content of the first and second substances,

u is the required output voltage of the motor and has the unit of V;

f is the tension value required by the yarn, and the unit is N;

r is the real-time roll diameter of the unwinding roller and the unit is m;

k and b are constants.

Further, the real-time winding diameter of the unwinding roller is calculated through the linear speed of the yarn and the revolution number of the motor in unit time.

Further, a real-time roll diameter calculation formula of the unwinding roller is as follows:

wherein the content of the first and second substances,

r is the real-time coil diameter and the unit is m;

v is the linear velocity of the yarn, and the unit is m/s;

n is the number of revolutions in the motor 1 s.

Further, the method also comprises the following steps:

and detecting each phase voltage of the three-phase voltage regulator, taking the average value of the three-phase voltage effective values as a control voltage, and adjusting the output voltage according to the comparison result of the control voltage and the required output voltage.

A system for maintaining tension in groups of fiber yarns, comprising:

the force machines are arranged in one-to-one correspondence with the unwinding rollers of the yarns and provide rotating power for the unwinding rollers;

the three-phase voltage regulator is connected with a group of motors to be controlled;

the unwinding roller measuring unit is used for acquiring parameters for calculating the winding diameter of the unwinding roller;

the controller is used for calculating the required output voltage of the motor according to the required tension of the yarn and the parameters;

and the three-phase voltage regulator controls the output voltage of a group of motors according to the required output voltage.

Further, the calculation formula of the required output voltage is as follows:

wherein the content of the first and second substances,

u is the required output voltage of the motor and has the unit of V;

f is the tension value required by the yarn, and the unit is N;

r is the real-time roll diameter of the unwinding roller and the unit is m;

k and b are constants.

Further, still include motor revolution acquisition unit, gather the revolution of motor in unit interval, include:

the magnet is fixed on a rotating shaft of the motor and synchronously rotates along with the motor;

the induction element is fixedly arranged and induces the number of rotation turns of the magnet;

the magnetic rotary encoder controls the accurate range of the number of turns through the self accuracy;

and the magnetic rotary encoder chip calculates the number of turns according to the induction result and the precision range.

Further, a real-time roll diameter calculation formula of the unreeling roller is as follows:

wherein the content of the first and second substances,

r is the real-time coil diameter and the unit is m;

v is the linear velocity of the yarn, and the unit is m/s;

n is the number of revolutions in the motor 1 s.

Further, the device also comprises a voltage detection module for detecting the single-phase voltage, and the detection result is used for adjusting the output voltage.

Through the technical scheme, the invention has the beneficial effects that:

the invention controls the voltage of a group of motors by the same three-phase voltage regulator, so that the motors in the group output the required output voltage under the same yarn tension, and the voltage changes in real time along with the winding diameter of a yarn drum, thereby effectively ensuring the consistency and stability of the tension of a plurality of strands of yarns.

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 some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a simplified schematic diagram of a yarn unwinding and warping process.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

A method of maintaining tension in groups of fiber yarns, comprising the steps of: a group of motors are powered by the same three-phase voltage regulator, the torque motor is adopted in the invention, the synchronous motor of the contactor voltage regulator controls the carbon brush to slide along the surface of the coil, the turn ratio is regulated to output a voltage effective value, the output voltage waveform is a sine wave, and the risk of harmonic interference is avoided; calculating the real-time roll diameter of the unwinding roller; calculating the required output voltage of the motor according to the tension required by the yarn and the real-time winding diameter, wherein the required output voltage is a change value which changes in real time according to the winding diameter; the output voltage of a group of motors is regulated to the required output voltage through a three-phase voltage regulator.

In the invention, a group of motors are subjected to voltage control by the same three-phase voltage regulator, as shown in figure 1, so that the motors in the group output required output voltage under the same yarn tension requirement, and the voltage changes in real time along with the winding diameter of a yarn drum, thereby effectively ensuring the consistency and stability of the tension of a plurality of strands of yarns.

As a preference of the above embodiment, the calculation formula of the required output voltage is as follows:

wherein, U is the required output voltage of the motor and the unit is V; f is the tension value required by the yarn, and the unit is N; r is the real-time roll diameter of the unwinding roller and the unit is m; k and b are constants.

The derivation of the above equation is as follows:

in the prior art, a curve relationship between the output torque M of the motor and the square of the current I and a straight-line relationship between the output torque M of the motor and the power P are known, and the relationship between the output torque M of the motor and the output voltage u is derived as follows:

M＝Ku²+ b formula one

Wherein M is the output torque of the motor and the unit is N.m; u is the output voltage of the motor, and the unit is V; k and b are constants.

Meanwhile, the following steps are known:

m ═ F · R formula two

Wherein M is the output torque of the motor and the unit is N.m; f is the output voltage of the motor and has the unit of V; r is the real-time roll diameter of the roll unwinding roller and the unit is m.

According to the formula one and the formula two, the following results are obtained:

F·R＝Ku²+ b formula three

The calculation formula of the required output voltage of the motor in the preferred scheme is obtained by derivation of the third public expression. The curve form in the formula I is different due to different manufacturers of motors, different parameters and the like, wherein the constant b is selected according to the initial voltage value of the motor, and the smooth starting of the motor can be ensured only when the voltage is greater than the initial voltage value. In the actual production process, a group of motors controlled by the invention need to be guaranteed to be from the same manufacturer and have the same parameters as much as possible, but in practice, the exact same self-attributes of the motors are difficult to guarantee, so that the K and b values of a group of motors are often obtained by debugging and data summarization, and the respective attributes of the group of motors are integrated.

As a preferred example of the above embodiment, the real-time winding diameter of the unwinding roller is calculated by the linear speed of the yarn and the number of revolutions of the motor in a unit time, and specifically, the real-time winding diameter calculation formula of the unwinding roller is as follows:

wherein R is the real-time coil diameter and the unit is m; v is the linear velocity of the yarn, and the unit is m/s; n is the number of revolutions in the motor 1 s. In order to ensure that the warped yarn is stably wound, the linear speed V generally needs to be controlled to a fixed value, so that the number of revolutions of the motor within 1s is changed in real time in order to adapt to the change of the winding diameter, and the speed can be acquired by the prior art.

In order to realize a closed-loop control mode, so that the output voltage of the motor is more accurate, and the output torque of the motor is more stable, the method for maintaining the tension of the fiber yarns in groups further comprises the following steps: each phase voltage of the three-phase voltage regulator is detected, the average value of the three-phase voltage effective values is taken as a control voltage, the output voltage is adjusted according to the comparison result of the control voltage and the required output voltage, the adjustment referred to here is a fine adjustment behavior, the closed-loop control of the motor is realized, and the adjustment precision can be adjusted in a mode of controlling the difference value limit value.

A system for maintaining tension in groups of fiber yarns, comprising: the motors are arranged in one-to-one correspondence to the yarn unwinding rollers and provide rotating power for the unwinding rollers; the three-phase voltage regulator is connected with a group of motors to be controlled; the device comprises an unwinding roller measuring unit, a winding diameter calculating unit and a winding diameter calculating unit, wherein the unwinding roller measuring unit is used for acquiring parameters for calculating the winding diameter of the unwinding roller, and the parameters can be directly the winding diameter of the unwinding roller or related parameters for calculating the winding diameter; the controller is used for calculating the required output voltage of the motor according to the tension and parameters required by the yarn and effectively ensuring the control of the motor through the required output voltage; the three-phase voltage regulator controls the output voltage of a group of motors according to the required output voltage.

Similarly, in the system of the invention, the same three-phase voltage regulator is used for controlling the voltage of a group of motors, so that the motors in the group output required output voltage under the same yarn tension requirement, and the same aim of ensuring the quality of the final fabric as in the above embodiment is fulfilled.

The calculation formula of the required output voltage is as follows:

wherein, U is the required output voltage of the motor and the unit is V; f is the tension value required by the yarn, and the unit is N; r is the real-time roll diameter of the unwinding roller and the unit is m; k and b are constants.

As a preferable mode of the foregoing embodiment, the parameter collected in this embodiment for calculating the roll diameter of the unwinding roller is the number of revolutions in the motor 1s, and therefore, the parameter further includes a motor revolution collecting unit for collecting the number of revolutions of the motor in a unit time, including: the magnet is fixed on a rotating shaft of the motor and synchronously rotates along with the motor; the induction element is fixedly arranged and induces the number of rotation turns of the magnet, wherein the fixed arrangement refers to the fixed arrangement relative to the unreeling through rotating shaft and is generally fixedly connected with the equipment body; the magnetic rotary encoder controls the accurate range of the number of turns through the self accuracy; and the magnetic rotary encoder chip calculates the number of turns according to the induction result and the precision range.

In the implementation process, the magnet is arranged on a rotating shaft of the motor and rotates along with the motor, the starting point at each time is used as the original point, the integral part of the number of turns of the whole turn rotated by the magnet is counted, the AB phase 4 frequency doubling precision of the magnetic rotary encoder is 1/1024, the single frequency precision is 1/256, single frequency doubling is adopted and is subdivided into 256 lattices, namely the number of the non-whole-turn turns of the motor is judged through the 256 lattices, and the decimal part of the number of turns is obtained. And (3) setting that the motor rotates by m1 circles at the original point within 1s, the timer counts time to t1, the remaining half circle is m2 cells, and the timer counts time to t2 for each cell, then:

N＝m1*t1+m2*t2

wherein m1 and m2 read data through a magnetic rotary encoder, t1 and t2 are obtained through the operation of an embedded central processing unit, and t1 and t2 have no unit.

Wherein, the real-time roll diameter calculation formula of the roll unreeling roller is as follows:

wherein R is the real-time coil diameter and the unit is m; v is the linear velocity of the yarn, and the unit is m/s; n is the number of revolutions in the motor 1s in units of 1/s.

Preferably, the system for maintaining the tension of the fiber yarns in groups further comprises a voltage detection module for detecting single-phase voltage, the detection structure is used for adjusting the output voltage, each detected voltage value of each phase is fed back to the PLC, the average value of the three-phase voltage effective values is taken as the control voltage, a closed loop is formed for controlling the motor, the output voltage is more accurate, and the output torque of the motor is more stable.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.