阅读说明：本技术 一种牵伸控制系统 (Drafting control system ) 是由 钱建波 钱凯伦 于 2019-08-19 设计创作，主要内容包括：本发明涉及布料加工技术领域,公开了一种牵伸控制系统,用于控制牵伸流水线,牵伸流水线包括导丝机、第一道牵伸机、第二道牵伸机、卷曲机和切割机；第一道牵伸机连接有第一电机和第一变频器,第二道牵伸机连接有第二电机和第二变频器；控制系统配置有控制器,控制器配置有基准线速度值、第一控制策略、第二控制策略,第一控制策略和第二控制策略分别根据第一牵伸比以及基准线速度值得到第一牵伸线速度值和第二牵伸线速度值,第一控制策略的第一控制算法计算得到第一变频器的第一变频输出值,第二控制策略的第二控制算法计算得到第二变频器的第二变频输出值；从而使第一牵伸线速度值和第二牵伸线速度值的比值与输入的第一牵伸比保持一致。(The invention relates to the technical field of cloth processing, and discloses a drafting control system which is used for controlling a drafting assembly line, wherein the drafting assembly line comprises a yarn guide machine, a first drafting machine, a second drafting machine, a crimping machine and a cutting machine; the first drafting machine is connected with a first motor and a first frequency converter, and the second drafting machine is connected with a second motor and a second frequency converter; the control system is provided with a controller, the controller is provided with a reference line speed value, a first control strategy and a second control strategy, the first control strategy and the second control strategy respectively obtain a first drafting line speed value and a second drafting line speed value according to a first drafting ratio and the reference line speed value, a first control algorithm of the first control strategy calculates a first variable frequency output value of the first frequency converter, and a second control algorithm of the second control strategy calculates a second variable frequency output value of the second frequency converter; so that the ratio of the first drafting linear speed value and the second drafting linear speed value is consistent with the input first drafting ratio.)

1. A drafting control system is used for controlling a drafting assembly line, wherein the drafting assembly line comprises a yarn guide machine, at least two different drafting machines, a crimping machine and a cutting machine which are sequentially connected, a plurality of first drafting rollers are arranged in a first drafting machine, the first drafting machine is connected with a first motor, a first frequency converter, a first speed reducer and a first gear box which are used for driving the first drafting machine, the first motor is connected with the first speed reducer through a first coupler, and the first speed reducer is in transmission connection with the output end of the first gear box; be equipped with a plurality of second draft rollers in the draft machine is said to the second, the draft machine is said to the second and is connected with second motor, second converter, second speed reducer and the second gear box that is used for driving the draft machine is said to the second, the second motor passes through the second coupling joint second speed reducer, and the second speed reducer is connected its characterized in that with the output transmission of second gear box: the draft control system is provided with a controller, the controller is used for inputting a first draft ratio, the first draft ratio is the ratio of a first draft linear velocity value to a second draft linear velocity value, the controller is provided with a reference linear velocity value, the controller is provided with a first control strategy and a second control strategy, the first control strategy obtains the first draft linear velocity value according to the first draft ratio and the reference linear velocity value and is provided with a first control algorithm, and the first control algorithm is used for calculating a first variable frequency output value of a first frequency converter according to the first draft linear velocity value and controlling the first frequency converter to work through the first variable frequency output value; and the second control strategy is used for obtaining a second drafting linear speed value according to the first drafting ratio and the reference linear speed value and is configured with a second control algorithm, and the second control algorithm is used for calculating a second variable-frequency output value of the second frequency converter according to the second drafting linear speed value and controlling the second frequency converter to work through the second variable-frequency output value.

2. A draft control system according to claim 1, wherein: the calculation formula of the first control algorithm is as follows:

f₁＝L₁×(K_1J+K_1C)×p₁/[(60×2)×D₁π]

wherein f is₁Is a first frequency-variable output value, L₁Is a first value of the draft linear velocity, K_1JIs the reduction ratio, K, of the first reduction gear_1CIs the reduction ratio of the first gearbox, p₁Number of poles of the first motor, D₁The roll diameter of the first drafting roll;

the calculation formula of the second control algorithm is as follows:

f₂＝L₂×(K_2J+K_2C)×p₂/[(60×2)×D₂π]

wherein f is₂Is the second frequency-conversion output value, L₂At a second value of the draft line velocity, K_2JIs the reduction ratio, K, of the second reduction gear_2CIs the reduction ratio, p, of the second gearbox₂Number of poles of the second motor, D₂The roll diameter of the second drafting roll.

3. A draft control system according to claim 2, wherein: the drafting assembly line further comprises a third drafting machine connected with the second drafting machine, a plurality of third drafting rollers are arranged in the third drafting machine, the third drafting machine is connected with a third motor, a third frequency converter, a third speed reducer and a third gear box, the third motor is used for driving the third drafting machine, the third motor is connected with the third speed reducer through a third coupler, and the third speed reducer is in transmission connection with the output end of the third gear box;

the controller is further configured to input a second draft ratio, where the second draft ratio is a ratio of a second draft linear velocity value to a third draft linear velocity value, and a third control strategy, where the third control strategy obtains a third draft linear velocity value according to the second draft ratio and a reference linear velocity value, and is configured with a third control algorithm, and the third control algorithm is configured to obtain a third variable-frequency output value of a third frequency converter according to the third draft linear velocity value, and control the third frequency converter to operate according to the third variable-frequency output value;

the calculation formula of the third control algorithm is as follows:

f₃＝L₃×(K_3J+K_3C)×p₃/[(60×2)×D₃π]

wherein f is₃Is the third frequency conversion output value, L₃As a third drafting linear speed value, K_3JIs the reduction ratio of the third speed reducer, K_3CIs the reduction ratio of the third gearbox, p₃Number of poles of the third motor, D₃The diameter of the third drafting roller.

4. A draft control system according to claim 3, wherein: the drafting assembly line further comprises a fourth drafting machine connected with the third drafting machine, a plurality of fourth drafting rollers are arranged in the fourth drafting machine, the fourth drafting machine is connected with a fourth motor, a fourth frequency converter, a fourth speed reducer and a fourth gear box, the fourth motor is used for driving the fourth drafting machine, the fourth motor is connected with the fourth speed reducer through a fourth coupler, and the fourth speed reducer is in transmission connection with the output end of the fourth gear box;

the controller is further configured to input a third draft ratio, where the third draft ratio is a ratio of a third draft linear velocity value to a fourth draft linear velocity value, the controller is further configured with a fourth control strategy, the fourth control strategy obtains a fourth draft linear velocity value according to the third draft ratio and a reference linear velocity value, and is configured with a fourth control algorithm, and the fourth control algorithm is configured to calculate a fourth variable frequency output value of a fourth frequency converter according to the fourth draft linear velocity value, and controls the fourth frequency converter to operate according to the fourth variable frequency output value;

the calculation formula of the fourth control algorithm is as follows:

f₄＝L₄×(K_4J+K_4C)×p₄/[(60×2)×D₄π]

wherein f is₄Is a fourth frequency-conversion output value, L₄At a fourth value of the draft linear velocity, K_4JIs the reduction ratio, K, of the fourth reduction gear_4CIs the reduction ratio of the fourth gear box, p₄Number of poles of the fourth motor, D₄The diameter of the fourth drafting roller.

5. A draft control system according to claim 4, wherein: the first drafting machine, the second drafting machine, the third drafting machine and the fourth drafting machine are respectively provided with a first speed sensor, a second speed sensor, a third speed sensor and a fourth speed sensor, each sensor can monitor the actual drafting linear speed value of each drafting machine in real time, a first actual drafting ratio is obtained through the first actual drafting linear speed value and the second actual drafting linear speed value, a second actual drafting ratio is obtained through the second actual drafting linear speed value and the third actual drafting linear speed value, and a third actual drafting ratio is obtained through the third actual drafting linear speed value and the fourth actual drafting linear speed value.

6. A draft control system according to claim 5, wherein: the first control strategy is further configured with a first adjusting algorithm, the first adjusting algorithm is used for calculating a first frequency conversion adjusting output value of the first frequency converter according to an error value between a first actual draft ratio and the first draft ratio, and controlling the first frequency converter to work through the first frequency conversion adjusting output value, and the calculation formula of the first adjusting algorithm is as follows:

wherein f is_1sAdjusting the output value, L, for the first frequency conversion₁Is a first drafting linear speed value, L_1sIs the first drafting actual linear velocity value, alpha is the parameter value, L₂Is the second drafting linear speed value, L_2sThe second drafting actual linear speed value.

7. A draft control system according to claim 6, wherein: the second control strategy is also provided with a second adjusting algorithm, the second adjusting algorithm is used for calculating a second frequency conversion adjusting output value of the second frequency converter according to an error value between the first actual draft ratio and the first draft ratio and an error value between the second actual draft ratio and the second draft ratio, and controlling the second frequency converter to work through the second frequency conversion adjusting output value, and the calculation formula of the second adjusting algorithm is as follows:

wherein f is_2sAdjusting the output value, L, for the second frequency conversion₂Is the second drafting linear speed value, alpha is the parameter value, L_1sIs the first drafting actual linear velocity value, L_2sIs the second drafting actual linear velocity value L_3sIs the third drafting actual linear velocity value L₁Is a first drafting linear speed value, L₃Is the third drafting linear speed value.

8. A draft control system according to claim 7, wherein: the third control strategy is further configured with a third adjusting algorithm, the third adjusting algorithm is used for calculating a third frequency conversion adjusting output value of a third frequency converter according to an error value between the second actual draft ratio and the second draft ratio and an error value between the third actual draft ratio and the third draft ratio, and controlling the third frequency converter to work through the third frequency conversion adjusting output value, and the calculation formula of the third adjusting algorithm is as follows:

wherein f is_3sAdjusting the output value, L, for the third frequency conversion₃Is the third drafting linear speed value, alpha is the parameter value, L_2sIs the second drafting actual linear velocity value L_3sIs the third drafting actual linear velocity value L_4sIs the fourth drafting actual linear velocity value L₂Is the second drafting linear speed value, L₄Is the fourth draft velocity value.

9. A draft control system according to claim 8, wherein: the fourth control strategy is further configured with a fourth adjusting algorithm, the fourth adjusting algorithm is used for calculating a fourth frequency conversion adjusting output value of a fourth frequency converter according to an error value between a third actual draft ratio and the third draft ratio, and controlling the fourth frequency converter to work through the fourth frequency conversion adjusting output value, and a calculation formula of the fourth adjusting algorithm is as follows:

wherein f is_4sAdjusting the output value, L, for the first frequency conversion₄Is a fourth drafting linear velocity value, L_4sIs the fourth drafting actual linear velocity value, alpha is the parameter value, L₃Is the third drafting linear speed value, L_3sThe third drafting actual linear speed value.

Technical Field

The invention relates to the technical field of cloth processing, in particular to a drafting control system.

Background

The existing polyester fiber processor mainly comprises a yarn guide machine, an oil tank, a first drafting machine, a water bath, a second drafting machine, a first steam box, a third drafting machine, a tension heat setting machine, a yarn folding machine, a second steam box and a crimping machine which are sequentially connected, wherein a synchronous gear box is connected to the crimping machine, and the eight-roller yarn guide machine, the first drafting machine, the second drafting machine, the third drafting machine, the tension heat setting machine, the yarn folding machine and the crimping machine are all driven by a unified motor.

Because the polyester fiber needs to be wound from the yarn guide machine to the crimper after being wound by a plurality of drafting machines in the processing process, and the drafting ratios of the drafting machines are different, namely the rotating speeds of the drafting rollers are different, the polyester fiber is easy to loose or break in the winding process, thereby influencing the normal production of the polyester staple fiber.

Disclosure of Invention

The invention aims to provide a drafting control system to solve the problem that polyester fibers are easy to loose or break in the process of producing polyester staple fibers by a polyester fiber processing machine in the prior art.

In order to achieve the above purpose, the basic scheme of the invention is as follows: a drafting control system is used for controlling a drafting assembly line, wherein the drafting assembly line comprises a yarn guide machine, at least two different drafting machines, a crimping machine and a cutting machine which are sequentially connected, a plurality of first drafting rollers are arranged in a first drafting machine, the first drafting machine is connected with a first motor, a first frequency converter, a first speed reducer and a first gear box which are used for driving the first drafting machine, the first motor is connected with the first speed reducer through a first coupler, and the first speed reducer is in transmission connection with the output end of the first gear box; the second drafting machine is internally provided with a plurality of second drafting rollers and is connected with a second motor, a second frequency converter, a second speed reducer and a second gear box which are used for driving the second drafting machine, the second motor is connected with a second speed reducer through a second coupler, and the second speed reducer is in transmission connection with the output end of the second gear box.

The draft control system is provided with a controller, the controller is used for inputting a first draft ratio, the first draft ratio is the ratio of a first draft linear velocity value to a second draft linear velocity value, the controller is provided with a reference linear velocity value, the controller is provided with a first control strategy and a second control strategy, the first control strategy obtains the first draft linear velocity value according to the first draft ratio and the reference linear velocity value and is provided with a first control algorithm, and the first control algorithm is used for calculating a first variable frequency output value of a first frequency converter according to the first draft linear velocity value and controlling the first frequency converter to work through the first variable frequency output value; and the second control strategy is used for obtaining a second drafting linear speed value according to the first drafting ratio and the reference linear speed value and is configured with a second control algorithm, and the second control algorithm is used for calculating a second variable-frequency output value of the second frequency converter according to the second drafting linear speed value and controlling the second frequency converter to work through the second variable-frequency output value.

Further, the calculation formula of the first control algorithm is as follows:

f₁＝L₁×(K_1J+K_1C)×p₁/[(60×2)×D₁π]

wherein f is₁Is a first frequency-variable output value, L₁Is a first value of the draft linear velocity, K_1JIs the reduction ratio, K, of the first reduction gear_1CIs the reduction ratio of the first gearbox, p₁Number of poles of the first motor, D₁The roll diameter of the first drafting roll;

the calculation formula of the second control algorithm is as follows:

f₂＝L₂×(K_2J+K_2C)×p₂/[(60×2)×D₂π]

wherein f is₂Is the second frequency-conversion output value, L₂At a second value of the draft line velocity, K_2JIs the reduction ratio, K, of the second reduction gear_2CIs the reduction ratio, p, of the second gearbox₂Number of poles of the second motor, D₂The roll diameter of the second drafting roll.

The third drafting machine is internally provided with a plurality of third drafting rollers, the third drafting machine is connected with a third motor, a third frequency converter, a third speed reducer and a third gear box which are used for driving the third drafting machine, the third motor is connected with the third speed reducer through a third coupler, and the third speed reducer is in transmission connection with the output end of the third gear box;

the controller is further configured to input a second draft ratio, where the second draft ratio is a ratio of a second draft linear velocity value to a third draft linear velocity value, and a third control strategy, where the third control strategy obtains a third draft linear velocity value according to the second draft ratio and a reference linear velocity value, and is configured with a third control algorithm, and the third control algorithm is configured to obtain a third variable-frequency output value of a third frequency converter according to the third draft linear velocity value, and control the third frequency converter to operate according to the third variable-frequency output value;

the calculation formula of the third control algorithm is as follows:

f₃＝L₃×(K_3J+K_3C)×p₃/[(60×2)×D₃π]

wherein f is₃Is the third frequency conversion output value, L₃As a third drafting linear speed value, K_3JIs the reduction ratio of the third speed reducer, K_3CIs the reduction ratio of the third gearbox, p₃Number of poles of the third motor, D₃The diameter of the third drafting roller.

The fourth drafting machine is internally provided with a plurality of fourth drafting rollers and is connected with a fourth motor, a fourth frequency converter, a fourth speed reducer and a fourth gear box which are used for driving the fourth drafting machine, the fourth motor is connected with the fourth speed reducer through a fourth coupler, and the fourth speed reducer is in transmission connection with the output end of the fourth gear box;

the controller is further configured to input a third draft ratio, where the third draft ratio is a ratio of a third draft linear velocity value to a fourth draft linear velocity value, the controller is further configured with a fourth control strategy, the fourth control strategy obtains a fourth draft linear velocity value according to the third draft ratio and a reference linear velocity value, and is configured with a fourth control algorithm, and the fourth control algorithm is configured to calculate a fourth variable frequency output value of a fourth frequency converter according to the fourth draft linear velocity value, and controls the fourth frequency converter to operate according to the fourth variable frequency output value;

the calculation formula of the fourth control algorithm is as follows:

f₄＝L₄×(K_4J+K_4C)×p₄/[(60×2)×D₄π]

wherein f is₄Is a fourth frequency-conversion output value, L₄At a fourth value of the draft linear velocity, K_4JIs the reduction ratio, K, of the fourth reduction gear_4CIs the reduction ratio of the fourth gear box, p₄Number of poles of the fourth motor, D₄The diameter of the fourth drafting roller.

Further, a first speed sensor, a second speed sensor, a third speed sensor and a fourth speed sensor are respectively installed on the first drafting machine, the second drafting machine, the third drafting machine and the fourth drafting machine, each sensor can monitor the actual drafting linear speed value of each drafting machine in real time, a first actual drafting ratio is obtained through the first actual drafting linear speed value and the second actual drafting linear speed value, a second actual drafting ratio is obtained through the second actual drafting linear speed value and the third actual drafting linear speed value, and a third actual drafting ratio is obtained through the third actual drafting linear speed value and the fourth actual drafting linear speed value.

Further, the first control strategy is further configured with a first adjusting algorithm, the first adjusting algorithm is configured to calculate a first variable-frequency adjustment output value of the first frequency converter according to an error value between the first actual draft ratio and the first draft ratio, and control the first frequency converter to operate through the first variable-frequency adjustment output value, and a calculation formula of the first adjusting algorithm is as follows:

wherein f is_1sAdjusting the output value, L, for the first frequency conversion₁Is a first drafting linear speed value, L_1sIs the first drafting actual linear velocity value, alpha is the parameter value, L₂Is the second drafting linear speed value, L_2sThe second drafting actual linear speed value.

Further, the second control strategy is further configured with a second adjusting algorithm, the second adjusting algorithm is configured to obtain a second variable-frequency adjustment output value of the second frequency converter according to an error value between the first actual draft ratio and the first draft ratio and an error value between the second actual draft ratio and the second draft ratio, and control the second frequency converter to operate through the second variable-frequency adjustment output value, and a calculation formula of the second adjusting algorithm is as follows:

wherein f is_2sAdjusting the output value, L, for the second frequency conversion₂Is the second drafting linear speed value, alpha is the parameter value, L_1sIs the first drafting actual linear velocity value, L_2sIs the second drafting actual linear velocity value L_3sIs the third drafting actual linear velocity value L₁Is a first drafting linear speed value, L₃Is the third drafting linear speed value.

Further, the third control strategy is further configured with a third adjusting algorithm, the third adjusting algorithm is configured to obtain a third frequency conversion adjusting output value of a third frequency converter according to an error value between the second actual draft ratio and the second draft ratio and an error value between the third actual draft ratio and the third draft ratio, and control the third frequency converter to operate through the third frequency conversion adjusting output value, and a calculation formula of the third adjusting algorithm is as follows:

wherein f is_3sAdjusting the output value, L, for the third frequency conversion₃Is the third drafting linear speed value, alpha is the parameter value, L_2sIs the second drafting actual linear velocity value L_3sIs the third drafting actual linear velocity value L_4sIs the fourth drafting actual linear velocity value L₂Is the second drafting linear speed value, L₄Is the fourth draft velocity value.

Further, the fourth control strategy is further configured with a fourth adjusting algorithm, the fourth adjusting algorithm is configured to calculate a fourth frequency conversion adjustment output value of a fourth frequency converter according to an error value between a third actual draft ratio and the third draft ratio, and control the fourth frequency converter to operate according to the fourth frequency conversion adjustment output value, and a calculation formula of the fourth adjusting algorithm is as follows:

wherein f is_4sAdjusting the output value, L, for the first frequency conversion₄Is a fourth drafting linear velocity value, L_4sIs the fourth drafting actual linear velocity value, alpha is the parameter value, L₃Is the third drafting linear speed value, L_3sThe third drafting actual linear speed value.

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

1. the control system can input a first draft ratio, a second draft ratio and a third draft ratio into the controller according to the processing technology requirements of different fibers, the controller calculates a first variable frequency output value, a second variable frequency output value, a third variable frequency output value and a fourth variable frequency output value through a first control algorithm, a second control algorithm, a third control algorithm and a fourth control algorithm respectively according to a configured reference line speed value, a first control strategy, a second control strategy, a third control strategy and a fourth control strategy, and each frequency converter outputs a frequency value meeting the requirements respectively, so that each draft ratio is consistent with the input draft ratio, and the fibers are prevented from being loosened or broken in the processing process.

2. In the process of controlling the drafting assembly line processing by the control system, the reference line speed value configured in the controller can be adjusted in real time so as to adjust the processing production efficiency.

3. The control system can be provided with a plurality of controllers, and each controller respectively controls a corresponding frequency converter; a single controller can be configured in the control system, and the single controller controls a plurality of frequency converters at the same time.

Drawings

FIG. 1 is a control block diagram of a draft control system controlling a draft line according to the present invention;

fig. 2 is a block diagram showing the structure of the draft machine of the present invention.

Reference numerals in the drawings of the specification include: the yarn guide machine 1, the yarn guide gear box 11, the yarn guide speed reducer 12, the yarn guide motor 13, the yarn guide frequency converter 14, the oil tank 2, the drafting machine 3, the first drafting machine 31, the first gear box 311, the first speed reducer 312, the first motor 313, the first frequency converter 314, the first speed sensor 315, the second drafting machine 32, the second gear box 322, the second speed reducer 322, the second motor 323, the second frequency converter 324, the second speed sensor 325, the third drafting machine 33, the third gear box 331, the third speed reducer 332, the third motor 333, the third frequency converter 334, the third speed sensor 335, the fourth drafting machine 34, the fourth gear box 341, the fourth speed reducer 342, the fourth motor 343, the fourth frequency converter 344, the fourth speed sensor 345, the water bath 35, the first steam drafting box 36, the second steam drafting box 37, the tension heat setting machine 4, the yarn stacking machine 5, the steam preheating box 6, the tension heat setting machine, A crimper 7, a crimping gear box 71, a crimping speed reducer 72, a crimping motor 73, a crimping frequency converter 74 and a cutter 8.

Detailed Description

The invention will be described in further detail by means of specific embodiments with reference to the accompanying drawings: