A Dynamic Identification Method and System for Sliver Uniformity in Bast Spinning Machines Based on Driving Current

Abstract

This invention relates to the field of flax sliver textile technology, and particularly to a method and system for dynamic identification of flax sliver uniformity in flax spinning machines based on drive current. The method includes: acquiring the speed adjustment amount of the drive motor; acquiring the speed adjustment amount of the drive motor by collecting the current value of the drive motor; calculating the difference between the current value of the drive motor and a set current value, and then dividing by a first correction coefficient; or acquiring the speed adjustment amount of the drive motor by collecting the flax sliver output profile value after the traction roller; calculating the difference between the flax sliver output profile value and a set profile value, and then dividing by a second correction coefficient; and adjusting the speed of the drive motor using the speed adjustment amount. This invention solves the problems of existing methods requiring additional weighing sensors, resulting in high modification costs and weighing accuracy issues.

Description

Technical Field

[0001] This invention relates to the field of hemp sliver textile technology, and in particular to a method and system for dynamic identification of hemp sliver uniformity in hemp spinning machines based on driving current. Background Technology

[0002] In the textile industry, whether spinning or weaving, the tension, count stability, and quantity of yarn thickness and fineness have a significant impact on product quality. Therefore, controlling yarn uniformity is essential for ensuring high-quality products and improving the uniformity of flax slivers in flax spinning machines.

[0003] The patent with publication number CN117107404A proposes setting multiple weighing sensors between different rollers and controlling the motor speed by measuring the weight of the hemp strips on the belt between different rollers. However, this method requires additional weighing sensors, resulting in high modification costs and weighing accuracy issues. Summary of the Invention

[0004] To address the shortcomings of existing methods, this invention measures the current of the drive motor when the sliver is stretched, and adjusts the traction speed of the sliver motor in real time based on the relationship between the current of the drive motor, the traction speed, and the measured diameter of the sliver, thereby improving the uniformity of sliver density and reducing yarn defects.

[0005] The technical solution adopted in this invention is: a dynamic identification method for the uniformity of flax sliver in flax spinning machines based on driving current, comprising the following steps:

[0006] Step 1: Obtain the speed adjustment amount of the drive motor;

[0007] The speed adjustment of the drive motor is achieved by collecting the current value of the drive motor; the difference between the current value of the drive motor and the set current value is then divided by the first correction coefficient.

[0008] The formula for adjusting the speed of the drive motor is:

[0009] Δv=ΔI / k1

[0010] Where k1 is the first correction coefficient, k1=d / de, d is the measured diameter of the hemp strip, and de is the standard diameter of the hemp strip; ΔI is the difference between the current value of the drive motor and the set current value;

[0011] Alternatively, the speed adjustment of the drive motor can be achieved by collecting the output profile value of the hemp strip after the traction roller; the difference between the output profile value of the hemp strip and the set profile value can be calculated, and then divided by the second correction coefficient.

[0012] Step 2: Adjust the speed of the drive motor using the speed adjustment function.

[0013] In a preferred embodiment of the present invention, the formula for the speed adjustment of the drive motor is:

[0014] Δv=ΔD / k2

[0015] Where k2 is the second correction coefficient, k2=exp(d / de), d is the measured diameter of the hemp strip, and de is the standard diameter of the hemp strip; ΔD is the difference between the output profile value of the hemp strip and the set profile value.

[0016] In a preferred embodiment of the present invention, a dynamic identification system for the uniformity of bast sliver in bast spinning machines based on driving current includes: a servo motor driver, a servo motor, a microprocessor, and a current sensor. The servo motor driver is connected to the microprocessor and the driving motor at both ends, respectively, and the current sensor is connected to both the microprocessor and the driving motor.

[0017] Servo motor drivers are used to control the speed of motors.

[0018] Current sensors are used to measure the current value of the drive motor;

[0019] The microprocessor calculates the current difference between the current value of the drive motor and the set current value to obtain the speed adjustment amount, thereby adjusting the speed of the drive motor.

[0020] In a preferred embodiment of the present invention, the microprocessor obtains the contour difference value by subtracting the output contour value of the hemp strip from the set contour value, thereby obtaining the speed adjustment amount and realizing the adjustment of the speed of the drive motor.

[0021] In a preferred embodiment of the present invention, it further includes: a camera module for acquiring the output contour value of the hemp strip after the traction roller.

[0022] In a preferred embodiment of the present invention, it further includes: a lamp source control circuit for supplementing light to the camera module.

[0023] In a preferred embodiment of the present invention, it further includes: a display screen for dynamically displaying the current of the hemp strip drive motor, the set current value of the hemp strip, and the rotational speed of the drive motor.

[0024] In a preferred embodiment of the present invention, it further includes: a power supply module for powering the servo motor driver and the microprocessor.

[0025] In a preferred embodiment of the present invention, it further includes: a communication interface for remote data transmission.

[0026] The beneficial effects of this invention are:

[0027] 1. During the spinning process of a bast fiber spinning machine, bast fiber is automatically fed by a conveyor belt. A current sensor automatically measures the current of the bast fiber stretching drive motor. Based on the set relationship between the bast fiber thickness and the corresponding drive current, the bast fiber traction speed is adjusted in real time. That is, the thicker the bast fiber, the greater the current of the bast fiber stretching drive motor. At this time, the bast fiber traction speed is increased to make the bast fiber diameter thinner. By adjusting the draft ratio, the density uniformity of the entire bast fiber spun by the spinning machine is kept consistent, with a deviation of less than ±5%.

[0028] 2. Using a current sensor, no modifications to the original equipment are required. The current sensor is installed on any power line of the drive motor, and its output signal is transmitted to the microprocessor. The microprocessor measures the current of the stretching hemp strip drive motor through the current sensor, compares it with the set hemp strip current, and controls the speed of the traction motor according to the hemp strip draw ratio, so as to achieve dynamic uniformity of hemp strip output and effectively reduce the hemp strip unevenness. Attached Figure Description

[0029] Figure 1 This is a flowchart of the dynamic identification method for uniformity of bast sliver in bast spinning machines based on driving current according to the present invention;

[0030] Figure 2 The present invention is a dynamic recognition system for the uniformity of flax slivers in flax spinning machines. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. The drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0032] like Figure 1 As shown, the dynamic identification method for flax sliver uniformity in flax spinning machines based on driving current includes the following steps:

[0033] Step 1: Obtain the speed adjustment amount of the drive motor;

[0034] The speed adjustment of the drive motor is achieved by collecting the current value I of the drive motor; the difference between the current value I of the drive motor and the set current value I0 is calculated and then divided by the first correction coefficient.

[0035] Alternatively, the speed adjustment of the drive motor is achieved by collecting the output profile value D of the hemp strip after the traction roller; the difference between the output profile value D of the hemp strip and the set profile value D0 is calculated, and then divided by the second correction coefficient;

[0036] Step 2: Adjust the speed of the drive motor using the speed adjustment function;

[0037] The current difference ΔI = I - I0, where I0 is the set current value;

[0038] The speed adjustment of the drive motor is Δv=ΔI / k1, where k1 is the first correction coefficient, k1=d / de, d is the measured diameter of the hemp strip, and de is the standard diameter of the hemp strip. The value of k1 ranges from 0.5 to 1.5, and de is usually set to 2mm.

[0039] The profile difference ΔD = D - D0, where D0 is the set profile value;

[0040] The speed adjustment of the drive motor is Δv = ΔD / k2, where k2 is the second correction coefficient, k2 = exp(d / de), d is the measured diameter of the hemp strip, and de is the standard diameter of the hemp strip.

[0041] Among them, the contour value D of the hemp strip is the outer diameter of the hemp strip when it is not stretched, and the measured diameter d of the hemp strip is the outer diameter of the hemp strip when it is stretched. D is greater than d.

[0042] For example, when the current I is less than the set current value I0, it means that the actual hemp strip is too thick and the speed of the drive motor of the hemp strip needs to be increased; otherwise, the opposite operation is performed. Similarly, the contour value of the hemp strip is compared.

[0043] like Figure 2 A dynamic identification system for the uniformity of bast sliver in bast spinning machines based on driving current includes: a servo motor driver, a servo motor, a microprocessor, and a current sensor. The servo motor driver is connected to the microprocessor and the driving motor at both ends, and the current sensor is connected to both the microprocessor and the driving motor.

[0044] Servo motor drivers are used to control the speed of motors.

[0045] Current sensors are used to measure the current value of the drive motor;

[0046] The microprocessor obtains the current difference ΔI by comparing the current value of the drive motor with the set hemp strip current, and adjusts the speed of the drive motor by the hemp strip draw ratio.

[0047] The current sensor is an open-type current sensor. It is connected to any power line of the drive motor and sends the detected current signal of the drive motor to the microprocessor. The current sensor is a 0-10A Hall current sensor, which automatically measures the current of the drive motor for stretching the sliver. Based on the set relationship between the thickness of the sliver and the corresponding drive current, the sliver traction speed is adjusted in real time. That is, the thicker the sliver, the greater the current of the drive motor for stretching the sliver. At this time, the sliver traction speed is increased to make the diameter of the sliver thinner. By adjusting the draft ratio, the density uniformity of the entire sliver spun by the spinning machine is kept consistent.

[0048] The microprocessor can be a single-chip microcomputer, such as STM32, or a PLC controller;

[0049] The servo motor driver uses a 12V DC power supply.

[0050] The servo motor is a 300W servo motor;

[0051] It also includes: a camera module for acquiring the output profile value of the hemp strip after the traction roller; the camera module can also output the measured diameter d of the hemp strip.

[0052] The microprocessor determines the uniformity of the hemp strip based on the size of the contour value, calculates the difference between the contour value D of the hemp strip and the set D0 of the set contour to obtain ΔD, and adjusts the traction speed of the hemp strip according to ΔD.

[0053] The camera module is a high-speed camera, using the OPENMV4H7PLUS camera. The camera module can also integrate an image processing module, which has image processing capabilities.

[0054] It also includes: a light source control circuit, which uses a 12VDC relay and two LEDs as the light source to provide supplementary lighting for the high-speed camera when measuring the contour value of the hemp strip, thereby improving the measurement accuracy.

[0055] It also includes: a display screen, which uses a color touch screen, and can dynamically display the current of the hemp strip drive motor, the set current value of the hemp strip, and the speed of the drive motor.

[0056] It also includes: a power supply module, which uses a 220VAC to 12VDC power switching power supply to power the servo motor driver, and a 12VDC to 3.3VDC converter module to power the microprocessor module.

[0057] It also includes: a communication interface, which uses RS485 for remote data transmission.

[0058] The output terminal of the open-type current sensor is connected to the A / D port of the microprocessor; the input terminal of the display screen is connected to the output I / O port of the microprocessor; the power module is connected to the corresponding power port of the microprocessor; the input terminal of the servo motor driver is connected to the output I / O port of the microprocessor; the output terminal of the servo motor driver is connected to the input terminal of the servo motor; the output terminal of the high-speed camera is connected to the A / D port of the microprocessor; the input terminal of the lamp source control circuit is connected to the output I / O port of the microprocessor; the output terminal of the lamp source control circuit is connected to the lamp source input terminal; and the input terminal of the communication interface is connected to the communication interface of the microprocessor.

[0059] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A method for dynamic identification of flax sliver uniformity in flax spinning machines based on driving current, characterized in that, A system for dynamic identification of flax sliver uniformity in flax spinning machines based on driving current includes: Servo motor driver, servo motor, microprocessor, and current sensor; among which, Servo motor drivers are used to control the speed of motors. Current sensors are used to measure the current value of the drive motor; The microprocessor calculates the current difference between the current value of the drive motor and the set current value to obtain the speed adjustment amount, thereby adjusting the speed of the drive motor. The microprocessor calculates the difference between the output contour value of the hemp strip and the set contour value to obtain the contour difference value, thereby obtaining the speed adjustment amount and realizing the adjustment of the speed of the drive motor. The camera module is used to acquire the output profile value of the hemp strip after the traction roller; The specific steps of the dynamic recognition method are as follows: Step 1: Obtain the speed adjustment amount of the drive motor; The speed adjustment of the drive motor is achieved by collecting the current value of the drive motor; the difference between the current value I of the drive motor and the set current value is then divided by the first correction coefficient. The formula for adjusting the speed of the drive motor is: ∆v=∆I / k1 Where k1 is the first correction coefficient, k1=d / de, d is the measured diameter of the hemp strip, and de is the standard diameter of the hemp strip; ∆I is the difference between the current value of the drive motor and the set current value; The current difference ∆I = I - I0, where I0 is the set current value; or, The speed adjustment of the drive motor is achieved by collecting the output profile value of the hemp strip after the traction roller; the difference between the output profile value of the hemp strip and the set profile value is calculated, and then divided by the second correction coefficient. The formula for adjusting the speed of the drive motor is: ∆v=∆D / k2 Where k2 is the second correction coefficient, k2=exp(d / de), d is the measured diameter of the hemp strip, de is the standard diameter of the hemp strip; ∆D is the difference between the output profile value of the hemp strip and the set profile value; The profile difference ∆D = D - D0, where D0 is the set profile value; The profile value D of the hemp strip is the outer diameter of the hemp strip when it is not taut, and the measured diameter d of the hemp strip is the outer diameter of the hemp strip when it is taut. D is greater than d. Step 2: Adjust the speed of the drive motor using the speed adjustment function.

2. The method for dynamic identification of flax sliver uniformity in flax spinning machines based on driving current according to claim 1, characterized in that, The system for dynamic identification of flax sliver uniformity in flax spinning machines based on driving current also includes: a lamp source control circuit for supplementary lighting of the camera module.

3. The method for dynamic identification of flax sliver uniformity in flax spinning machines based on driving current according to claim 1, characterized in that, The system for the dynamic identification method of sliver uniformity in bast spinning machines based on drive current also includes: a display screen for dynamically displaying the current of the sliver drive motor, the set current value of the sliver, and the rotational speed of the drive motor.

4. The method for dynamic identification of flax sliver uniformity in flax spinning machines based on driving current according to claim 1, characterized in that, The system for dynamic identification of flax sliver uniformity in flax spinning machines based on driving current also includes a power supply module for powering the servo motor driver and the microprocessor.

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