Dynamic identification method and system for uniformity of hemp slivers of hemp thread spinner based on driving current

Abstract

The invention relates to the technical field of sliver spinning, in particular to a dynamic identification method and system for the uniformity of slivers of a bast fiber spinner based on driving current, and the method comprises the steps: obtaining the rotating speed adjustment amount of a driving motor; the rotating speed adjustment amount of the driving motor is obtained by collecting the current value of the driving motor; the current value of the driving motor is subtracted from a set current value and then is divided by a first correction coefficient; or the rotating speed adjustment amount of the driving motor outputs a contour value by collecting the ramie sliver after the traction roller; carrying out difference calculation on the sliver output contour value and a set contour value, and then dividing by a second correction coefficient; adjusting the rotating speed of the driving motor by using the rotating speed adjustment amount. The method solves the problems that a weighing sensor needs to be additionally arranged in an existing method, the transformation cost is high, and the weighing precision exists.

Description

Technical Field

[0001] The invention relates to the technical field of hemp strip textiles, and in particular to a method and a system for dynamically identifying the uniformity of hemp strips of a hemp spinning machine based on a driving current. Background Art

[0002] In the textile industry, whether it is spinning or weaving, the tension of the yarn, the stability of the yarn count and the number of yarn thickness and fineness will have a significant impact on the quality of the product; therefore, how to control the uniformity of the yarn is the guarantee of high-quality products, in order to improve the uniformity of the hemp spinning machine.

[0003] The patent publication number is CN117107404A. Multiple weighing sensors are set between different rollers. The motor speed is controlled by measuring the weight of the hemp strips on the belt between different rollers. This method requires additional weighing sensors, which has a high modification cost and there is a problem with weighing accuracy. Summary of the invention

[0004] In view of the shortcomings of the existing methods, the present invention measures the current of the driving motor when the hemp strip is stretched, and adjusts the traction speed of the hemp strip motor in real time according to the relationship between the current of the driving motor, the traction speed and the measured diameter of the hemp strip, thereby improving the uniformity of the hemp strip density and reducing yarn defects.

[0005] The technical solution adopted by the present invention is: a method for dynamically identifying uniformity of hemp strips of hemp spinning machines based on driving current comprises the following steps: Step 1: Obtain the speed adjustment value of the drive motor; The speed adjustment amount of the driving motor is obtained by collecting the current value of the driving motor; subtracting the current value of the driving motor from the set current value and then dividing it by the first correction coefficient; The formula for the speed adjustment of the drive motor is: Δv=ΔI / k1 Wherein, k1 is the first correction coefficient, k1=d / de, d is the measured diameter of the hemp strip, de is the standard diameter of the hemp strip; ΔI is the difference between the current value of the driving motor and the set current value; Or the speed adjustment amount of the driving motor is obtained by collecting the output profile value of the flax strip after the traction roller; subtracting the output profile value of the flax strip from the set profile value, and then dividing it by the second correction coefficient; Step 2: Use the speed adjustment amount to adjust the speed of the drive motor.

[0006] As a preferred embodiment of the present invention, the formula for the speed adjustment amount of the driving motor is: Δv=ΔD / k2 Among them, 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; ΔD is the difference between the output profile value of the hemp strip and the set profile value.

[0007] As a preferred embodiment of the present invention, a dynamic identification system for uniformity of hemp strips of hemp spinning machine based on driving current includes: a servo motor driver, a servo motor, a microprocessor and a current sensor, wherein both ends of the servo motor driver are respectively connected to the microprocessor and the driving motor, and the current sensor is respectively connected to the microprocessor and the driving motor; wherein, The servo motor driver is used to drive the motor's speed control; The current sensor is used to measure the current value of the drive motor; The microprocessor obtains the current difference by subtracting the current value of the drive motor from the set current value, thereby obtaining the speed adjustment amount to adjust the speed of the drive motor.

[0008] As a preferred embodiment of the present invention, the microprocessor obtains a profile difference by subtracting the output profile value of the hemp strip from the set profile value, thereby obtaining a speed adjustment amount to adjust the speed of the drive motor.

[0009] As a preferred embodiment of the present invention, it also includes: a camera module for obtaining the output contour value of the hemp strip after being drawn by the roller.

[0010] As a preferred implementation manner of the present invention, it also includes: a light source control circuit for supplementary lighting of the camera module.

[0011] As a preferred embodiment of the present invention, it also includes: a display screen for dynamically displaying the current of the hemp strip driving motor, the set current value of the hemp strip, and the speed of the driving motor.

[0012] As a preferred embodiment of the present invention, it also includes: a power supply module for powering the servo motor driver and the microprocessor.

[0013] As a preferred embodiment of the present invention, it also includes: a communication interface for remote data transmission.

[0014] Beneficial effects of the present invention: 1. During the spinning process of the hemp spinning machine, the hemp strips are automatically conveyed through the conveyor belt, and the current of the hemp strip stretching drive motor is automatically measured by the current sensor. According to the relationship between the set hemp strip thickness and the corresponding drive current, the hemp strip pulling speed is adjusted in real time. That is, the thicker the hemp strip, the greater the current of the hemp strip stretching drive motor. At this time, the hemp strip pulling speed is adjusted to be faster to make the hemp strip diameter thinner; by adjusting the draft ratio, the density uniformity of the whole hemp strip spun by the spinning machine is kept consistent, and the deviation is less than ±5%; 2. The current sensor is used without modifying the original equipment. The current sensor is installed on any power line of the drive motor. Its output signal is transmitted to the microprocessor. The microprocessor measures the current of the stretched hemp strip drive motor through the current sensor, and then compares it with the set hemp strip current. According to the hemp strip drafting ratio, the microprocessor controls the speed of the traction motor to achieve dynamic uniformity of hemp strip output and effectively reduce the unevenness of the hemp strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flow chart of the method for dynamically identifying the uniformity of hemp strips of hemp spinning machines based on driving current of the present invention; Figure 2 The invention relates to a dynamic identification system for uniformity of flax strips of a flax spinning machine. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore it only shows the components related to the present invention.

[0017] like Figure 1 As shown, the method for dynamically identifying the uniformity of hemp strips of hemp spinning machines based on driving current includes the following steps: Step 1: Obtain the speed adjustment value of the drive motor; The speed adjustment amount of the driving motor is obtained by collecting the current value I of the driving motor; subtracting the current value I of the driving motor from the set current value I0, and then dividing it by the first correction coefficient; Or the speed adjustment amount of the driving motor is obtained by collecting the output profile value D of the flax strip after the traction roller; calculating the difference between the output profile value D of the flax strip and the set profile value D0, and then dividing it by the second correction coefficient; Step 2: Use the speed adjustment amount to adjust the speed of the drive motor; Current difference ΔI=I-I0, I0 is the set current value; The speed adjustment of the driving motor is Δv=ΔI / k1, k1 is the first correction coefficient, k1=d / de, d is the measured diameter of the hemp strip, de is the standard diameter of the hemp strip, k1 value range is 0.5-1.5, and de is usually set to 2mm.

[0018] Contour difference ΔD=D-D0, D0 is the set contour value; The speed adjustment of the driving motor is Δv=ΔD / k2, 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.

[0019] Among them, the contour value D of the hemp strip is the outer diameter of the hemp strip when it is not tightened, and the measured diameter d of the hemp strip is the outer diameter of the hemp strip when it is tightened, and D is greater than d.

[0020] For example, when the current I is less than the set current value I0, it means that the actual hemp strip is thicker and the speed of the driving motor of the hemp strip needs to be increased, otherwise the opposite operation is performed; similarly, the hemp strip contour values ​​are compared.

[0021] like Figure 2 The dynamic identification system of the uniformity of the hemp strips of the hemp spinning machine based on the driving current includes: a servo motor driver, a servo motor, a microprocessor and a current sensor, wherein the two ends of the servo motor driver are respectively connected to the microprocessor and the driving motor, and the current sensor is respectively connected to the microprocessor and the driving motor; wherein, The servo motor driver is used to drive the motor's speed control; The current sensor is used to measure the current value of the drive motor; The microprocessor obtains the current difference ΔI based on the current value of the driving motor and compares it with the set flax strip current, and adjusts the speed of the driving motor through the flax strip drafting ratio.

[0022] Among them, the current sensor adopts an open current sensor; the current sensor is connected to any power line of the driving motor to send the detection current signal of the driving motor to the microprocessor; the current sensor adopts a 0-10A Hall current sensor, and uses the current sensor to automatically measure the current size of the driving motor for stretching the hemp strips, and adjusts the hemp strip pulling speed in real time according to the relationship between the set hemp strip thickness and the corresponding driving current, that is, the thicker the hemp strip, the greater the current of the hemp strip stretching driving motor, and at this time, the hemp strip pulling speed is increased to make the hemp strip diameter thinner; by adjusting the draft ratio, the density uniformity of the whole hemp strip spun by the spinning machine is kept consistent.

[0023] The microprocessor can be a single-chip microcomputer, such as STM32, or a PLC controller; The servo motor driver adopts a 12V DC powered servo motor driver; The servo motor uses a 300W servo motor; It also includes: a camera module, which is used to obtain the output contour value of the hemp strip after being pulled by the roller; the camera module can also output the measured diameter d of the hemp strip.

[0024] The microprocessor determines the uniformity quality of the flax strip according to the size of the contour value, calculates the difference between the contour value D of the flax strip and the set contour D0 to obtain ΔD, and adjusts the flax strip pulling speed according to ΔD.

[0025] The camera module is a high-speed camera that uses an OPENMV4H7PLUS camera. An image processing module can also be integrated into the camera module to provide image processing capabilities.

[0026] It also includes: a light source control circuit, which uses a 12VDC relay and two LED lights as the light source, which provide supplementary light for the high-speed camera to measure the contour value of the hemp strips, thereby improving the measurement accuracy.

[0027] The utility model also comprises: a display screen, which adopts a color touch screen and can dynamically display the current of the driving motor of the hemp strip, the set current value of the hemp strip, and the rotating speed of the driving motor.

[0028] 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 conversion module to power the microprocessor module.

[0029] It also includes: a communication interface using RS485 for remote data transmission.

[0030] The output end of the open current sensor is connected to the A / D port of the microprocessor; the input end of the display screen is connected to the output I / O port of the microprocessor; the power module is connected to the power port corresponding to the microprocessor; the input end of the servo motor driver is connected to the output I / O port of the microprocessor; the output end of the servo motor driver is connected to the input end of the servo motor; the output end of the high-speed camera is connected to the A / D port of the microprocessor; the input end of the light source control circuit is connected to the output I / O port of the microprocessor; the output end of the light source control circuit is connected to the light source input end; and the input end of the communication interface is connected to the communication interface of the microprocessor.

[0031] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A dynamic identification method for uniformity of hemp strips of hemp spinning machines based on driving current, characterized in that: The following steps are involved: Step 1: Obtain the speed adjustment value of the drive motor; The speed adjustment amount of the driving motor is obtained by collecting the current value of the driving motor; subtracting the current value of the driving motor from the set current value and then dividing it by the first correction coefficient; The formula for the speed adjustment of the drive motor is: Δv=ΔI / k1 Wherein, k1 is the first correction coefficient, k1=d / de, d is the measured diameter of the hemp strip, de is the standard diameter of the hemp strip; ΔI is the difference between the current value of the driving motor and the set current value; or, The speed adjustment amount of the driving motor is obtained by collecting the output profile value of the hemp strip after the traction roller; subtracting the output profile value of the hemp strip from the set profile value, and then dividing it by the second correction coefficient; Step 2: Use the speed adjustment amount to adjust the speed of the drive motor.

2. The method for dynamically identifying uniformity of hemp strips of hemp spinning machines based on driving current according to claim 1 is characterized in that: The formula for the speed adjustment of the drive motor is: Δv=ΔD / k2 Among them, 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; ΔD is the difference between the output profile value of the hemp strip and the set profile value.

3. A system using the method for dynamically identifying uniformity of hemp strips of hemp spinning machines based on driving current according to any one of claims 1 to 2, characterized in that: include: A servo motor driver, a servo motor, a microprocessor and a current sensor; wherein, The servo motor driver is used to drive the motor's speed control; The current sensor is used to measure the current value of the drive motor; The microprocessor obtains the current difference by subtracting the current value of the drive motor from the set current value, thereby obtaining the speed adjustment amount to adjust the speed of the drive motor.

4. The method for dynamically identifying uniformity of hemp strips of hemp spinning machines based on driving current according to claim 3 is characterized in that: The microprocessor obtains the profile difference by subtracting the output profile value of the hemp strip from the set profile value, thereby obtaining the speed adjustment amount to adjust the speed of the drive motor.

5. The method for dynamically identifying uniformity of hemp strips of hemp spinning machines based on driving current according to claim 3 is characterized in that: Also includes: The camera module is used to obtain the output profile value of the flax strip after being drawn by the roller.

6. The method for dynamically identifying uniformity of hemp strips of hemp spinning machines based on driving current according to claim 3 is characterized in that: Also includes: Light source control circuit, used for fill light of camera module.

7. The method for dynamically identifying uniformity of hemp strips of hemp spinning machines based on driving current according to claim 3 is characterized in that: Also includes: The display screen is used to dynamically display the current of the hemp strip driving motor, the set current value of the hemp strip, and the speed of the driving motor.

8. The method for dynamically identifying uniformity of hemp strips of hemp spinning machines based on driving current according to claim 3 is characterized in that: Also includes: Power supply module for servo motor drive and microprocessor power supply.

9. The method for dynamically identifying uniformity of hemp strips of hemp spinning machines based on driving current according to claim 3, characterized in that: Also includes: Communication interface, used for remote data transmission.

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