On-line detection method and device for sizing rate on sizing machine

Abstract

The present application relates to a sizing rate on-line detection method and device, which detects the real-time weight of the beam, the sizing moisture regain, the dry linear density of the yarn, the total number of the arranged roots of the yarn to be sized and the comprehensive elongation of the yarn through reliable detection device; and obtains the winding speed of the beam and / or the unwinding speed of the beam, and then calculates the sizing rate by using the sizing rate calculation formula, so as to effectively improve the detection precision of the sizing rate of the yarn.

Description

Technical Field

[0001] This invention belongs to the field of sizing technology, specifically relating to an online detection method and device for sizing rate of a sizing machine. Background Technology

[0002] A sizing machine is a textile production equipment used to sizing yarns required for weaving. After sizing, a certain amount of sizing agent is absorbed onto the yarn, enhancing the cohesion between fibers and forming a strong sizing film on the yarn surface. This improves the yarn's breaking strength and abrasion resistance, reduces yarn hairiness, and comprehensively enhances the yarn's weavability, ensuring the smooth progress of subsequent weaving processes.

[0003] In this process, the amount of sizing agent absorbed by the yarn plays a decisive role in improving its weaveability. The sizing rate is typically used as an indicator to represent the amount of sizing agent absorbed by the yarn surface. It is calculated as the percentage of the dry weight of the warp yarn after sizing to the original dry weight of the warp yarn before sizing. Controlling the sizing rate is crucial in the sizing process. On the one hand, an excessively low sizing rate may result in insufficient improvement in yarn weaveability, making it difficult to meet the needs of subsequent weaving production; on the other hand, increasing the sizing rate may increase the cost of sizing agent usage. Furthermore, an excessively high sizing rate can cause the yarn to become brittle and break easily, which may also lead to a decrease in yarn weaveability. Therefore, in the sizing process, it is often necessary to control the sizing rate at an optimal level based on experience to ensure sufficient improvement in yarn weaveability while reducing the production cost of sizing.

[0004] However, accurately detecting the sizing rate is very difficult in sizing production. Typically, offline measurements are performed using either the fixed-length drying and weighing method or the desizing method. The fixed-length drying and weighing method requires taking a known length of sized yarn sample, drying it, weighing it, and then substituting it into the known dry weight of the original yarn into the sizing rate calculation formula to obtain the yarn's sizing rate. The desizing method requires removing the sizing agent from the yarn in a solvent, drying it, weighing it, and then calculating the sizing rate based on the yarn's weight loss rate after desizing. However, these methods cannot perform online detection of the sizing rate on the sizing machine, making it difficult to guide the formulation of sizing processes in real time.

[0005] In response, some researchers have proposed indirect methods for measuring sizing rate, such as using parameters like sizing concentration, viscosity, temperature, pressure of the first and second sizing rollers, immersion roller position, sizing machine speed, yarn coverage factor, yarn tension, and drying temperature, and estimating the sizing rate using a trained neural network model (see CN102998434A Real-time Online Detection Method for Sizing Rate During Sizing); estimating the sizing rate by measuring the infrared spectrum of the sized yarn using Fourier near-infrared spectroscopy (see CN101446549A A Method for Detecting Sizing Rate Using Near-Infrared Spectroscopy); and adding a certain proportion of measurable media to the sizing solution beforehand. The methods include: 1) estimating yarn sizing rate by detecting the content of the medium in the yarn (see CN101705611A, Online Detection Method for Yarn Sizing Medium); 2) measuring the specific heat capacity and thermal conductivity of standard yarn using a calorimeter and thermal conductivity meter, and deriving the yarn sizing rate based on a pre-calibrated formula (see CN111751404B, A Method for Indirectly Detecting Sizing Rate and Moisture Regain Based on Thermal Properties); and 3) reading the dielectric constant of the yarn using a capacitive sensor and deriving the yarn sizing rate based on a pre-established model of the relationship between dielectric constant and sizing rate (see CN113340949A, A Method for Detecting Sizing Rate Based on the Dielectric Properties of Materials). These indirect measurement methods rely on models relating certain measured data to sizing rate for estimation. The reliability of the model directly affects the measurement results, making the accuracy of the results difficult to measure and limiting their practicality. Summary of the Invention

[0006] The primary technical problem to be solved by this invention is to provide an online detection method for sizing rate on a sizing machine, thereby addressing the issue of low accuracy in online sizing rate measurement.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an online detection method for sizing rate of a sizing machine, comprising the following specific steps:

[0008] a. Acquisition of yarn sizing parameters: Obtain the real-time weight m (t) of the warp beam, the moisture regain k (t) of the sizing yarn, the dry linear density S of the yarn, the total number of yarns to be sized N, and the overall elongation γ of the yarn. z And obtain the warp beam winding speed v. j (t) and / or warp unwinding speed v t (t), m(t) is in g, S is in g / km, v j The unit of (t) is m / s, v t The unit of (t) is m / s.

[0009] b. Sizing rate calculation: Calculate the current real-time yarn sizing rate s(t) according to the following formula (1):

[0010]

[0011] Where m 浆 (t) represents the dry weight of the sizing yarn, m 原 (t) is the dry weight of the raw yarn, which is calculated using the following formulas (2) and (3):

[0012]

[0013] In formulas (2) and (3), Δt is the detection step size, preset according to the frequency of the sizing rate output by the user, and γ(t) is the yarn elongation at the current moment. t When γ(t) = 0, γ(t) is calculated using the following formula (4):

[0014]

[0015] γ z1 It is the elongation correction factor, which is calibrated through off-machine testing;

[0016] When unknown v t When γ(t) = 0, γ(t) is calculated using the following formula (5):

[0017] γ(t)=γ z2 (5);

[0018] Overall elongation γ z2 It refers to the total elongation of the yarn from unwinding to winding on the sizing machine, which is calibrated through off-machine testing.

[0019] c. Sizing rate output: The real-time yarn sizing rate s(t) calculated in step b is output through the output device.

[0020] As a preferred embodiment, the real-time weight m(t) of the warp beam is obtained by a pressure sensor installed at the bottom of the bearing housing of the sizing machine head; the moisture regain k(t) of the sizing is obtained by a moisture regain sensor installed between the drying chamber and the warp beam; the dry linear density S of the yarn is the theoretical dry linear density or the measured actual linear density; and the warp beam winding speed v... j (t) The warp unwinding speed v is obtained by a first speed sensor installed upstream of the warp beam of the sizing machine. t (t) is obtained by a second speed sensor installed downstream of the warp beam.

[0021] As a preferred embodiment, the first speed sensor includes a first guide roller disposed between the drying chamber and the warp beam, a speed measuring wheel synchronously driven with the first guide roller, and a first encoder coaxially connected to one end of the speed measuring wheel. The first encoder is fixedly disposed. The two ends of the first guide roller are respectively fixedly connected to the outer wall of the drying chamber through the first support. The sized yarn dried in the drying chamber passes through the first guide roller and is wound onto the warp beam. The second speed sensor includes a second guide roller disposed between the warp beam frame and the sizing tank, a swing arm rotatably connected to one end of the second guide roller, a servo motor fixedly connected to the other end of the swing arm, and a second encoder coaxially connected to the second guide shaft. The second encoder is fixedly connected to the swing arm.

[0022] As a preferred embodiment, the above technical solution further includes the following steps:

[0023] d. Extended output content: Based on the real-time yarn sizing rate s(t) at each time t, output the sizing rate results in the following manner:

[0024] 1) Real-time output of the sizing rate detection results at the current moment;

[0025] 2) Output the average test results of sizing rate over a period of time;

[0026] 3) Output a chart showing the trend of sizing rate over time;

[0027] 4) Output a chart showing the trend of sizing rate as a function of yarn running length. The specific calculation method includes converting any time t0 into the yarn running length L(t0) using the following formula.

[0028]

[0029] Where v is v j or v t ;

[0030] 5) Statistically analyze the average results of sizing rate tests on any warp beam. in:

[0031] Average results The calculation is performed in units of time t, and the calculation method is as follows:

[0032]

[0033] Where T is the end time of the warp beam winding;

[0034] or average result The calculation is based on the yarn running length L, and the calculation method is as follows:

[0035]

[0036] Where T is the end time of the warp beam winding, and v is v j or v t .

[0037] A further technical problem to be solved by the present invention is to provide an online detection device for sizing rate of a sizing machine, thereby solving the technical problem of low accuracy in online measurement results of sizing rate.

[0038] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an online sizing rate detection device for a sizing machine, including a warp beam weight sensing component, a machine speed sensing component, a moisture regain sensing component, a central processing unit, a sizing rate output module, and a human-machine interaction module. The weight sensing component is a pressure sensor installed at the bottom of the bearing seat of the sizing machine head, used to detect the weight of the warp beam at any given time. The machine speed sensing component includes a first speed sensor and / or a second speed sensor. The first speed sensor includes a first guide roller disposed between the drying chamber and the warp beam and perpendicular to the yarn movement direction, bearing seats for supporting both ends of the first guide roller, and a first encoder coaxially connected to the first guide roller. The housing of the first encoder is fixedly connected to the bearing seats, and the sizing yarn is wound onto the warp beam after passing through the first guide roller. The second speed sensor includes a... A second guide roller, perpendicular to the yarn movement direction, is located between the warp beam and the sizing tank. A second encoder, coaxially connected to the second guide roller, is fixedly mounted in the housing. A moisture regain sensing component is a moisture regain tester, positioned between the warp beam and the drying oven, used to detect the moisture regain of the sized yarn after it leaves the drying oven. A central processing unit is a microcontroller, electrically connected to the first encoder, second encoder, pressure sensor, moisture regain tester, sizing rate output module, and human-machine interface module. The first encoder, second encoder, pressure sensor, and moisture regain tester send the detected information to the microcontroller. After processing, the microcontroller outputs the result through the sizing rate output module. The human-machine interface module sends instructions to the microcontroller. The microcontroller for the sizing rate output module is a display or touchscreen; the microcontroller for the human-machine interface module is a touchscreen or keyboard.

[0039] As a preferred embodiment, the two ends of the second guide roller are rotatably connected to swing arms, and the other ends of the two swing arms are respectively fixedly connected to the two ends of the output shaft of a dual-output shaft servo motor. The second encoder is fixedly connected to one of the swing arms. The servo motor can output stable torque, thereby keeping the yarn at constant tension, so as to ensure that the second guide roller rotates synchronously with the yarn.

[0040] This invention uses a reliable detection device to detect and obtain the real-time weight of the warp beam, the moisture regain of the sizing yarn, the dry linear density of the yarn, the total number of yarns to be sized, and the overall elongation of the yarn; it also obtains the winding speed of the warp beam and / or the unwinding speed of the warp beam, and then calculates the sizing rate using the sizing rate calculation formula. The sizing rate detection result is obtained through a direct detection method, thereby effectively improving the detection accuracy of the yarn sizing rate. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the specific structure of the online sizing rate detection device for the sizing machine described in this invention;

[0042] Figure 2 This is a control principle diagram of the online sizing rate detection device for the sizing machine described in this invention;

[0043] Figure 1 and 2 In the middle, 1. Bearing housing, 2. Pressure sensor, 3. First speed sensor, 3a. First guide roller, 3b. Speed ​​measuring wheel, 3c. First encoder, 3d. First support, 4. Second speed sensor, 4a. Second guide roller, 4b. Swing arm, 4c. Servo motor, 4d. Second encoder, 5. Drying oven, 6. Weaving beam, 7. Sizing, 8. Warp beam frame, 9. Sizing tank, 10. Moisture regain sensor, 11. Microcontroller, 12. Sizing rate output module, 13. Human-machine interaction module, 14. Chuck. Detailed Implementation

[0044] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0045] Example 1:

[0046] like Figure 1 The diagram shows an online sizing rate detection device for a sizing machine, comprising a warp beam weight sensing component, a machine speed sensing component, a moisture regain sensing component, a central processing unit, a sizing rate output module 12, and a human-machine interaction module 13. The weight sensing component is a pressure sensor 2 installed at the bottom of the bearing seat 1 of the sizing machine head. The pressure sensor 2 is used to detect the weight of the warp beam at any given time. There are two bearing seats 1 on the sizing machine head, each with a pressure sensor 2 at its bottom. Coaxially arranged chucks 14 are rotatably connected to each of the two bearing seats 1. The warp beam 6 is coaxially positioned between the two chucks 14 and is connected to the sizing machine head by being clamped by the two chucks 14.

[0047] The speed sensing component includes a first speed sensor 3 and a second speed sensor 4. The first speed sensor 3 includes a first guide roller 3a disposed between the drying chamber 5 and the weaving beam 6 and perpendicular to the yarn movement direction, bearing seats 3b for supporting both ends of the first guide roller 3a, and a first encoder 3c coaxially connected to the first guide roller 3a. The housing of the first encoder 3c is fixedly connected to the bearing seats 3b. The sized yarn 7 is wound onto the weaving beam 6 after passing through the first guide roller 3a. The sized yarn 7 drives the first guide roller 3a to rotate, and the first guide roller 3a drives the first encoder 3c to rotate. The first encoder 3c obtains the rotational speed and sends it to the central processing unit. The central processing unit calculates the wheel surface linear speed of the first guide roller 3a, i.e., the weaving beam winding speed, based on the rotational speed sent by the first encoder 3c.

[0048] The second speed sensor 4 includes a second guide roller 4a disposed between the warp beam frame 8 and the sizing trough 9 and perpendicular to the yarn movement direction, and a second encoder 4d coaxially connected to the second guide roller 4a. The housing of the second encoder 4d is fixedly disposed. The second guide roller 4a rotates with the yarn and drives the second encoder 4d to rotate. The second encoder 4d obtains the rotational speed and sends it to the central processing unit. The central processing unit calculates the linear velocity of the roller surface of the second guide roller 4a, i.e., the warp beam unwinding speed, based on the rotational speed sent by the second encoder 4d.

[0049] As a preferred embodiment, the two ends of the second guide roller 4a are rotatably connected to swing arms 4b, and the other ends of the two swing arms 4b are respectively fixedly connected to the two ends of the output shaft of a dual-output shaft servo motor 4c. The second encoder 4d is fixedly connected to one of the swing arms 4b. The servo motor 4c can output a stable torque, thereby keeping the yarn at a constant tension, so as to ensure that the second guide roller 4a rotates synchronously with the yarn.

[0050] The moisture regain sensing component is a resistive moisture regain tester 10, which is set between the weaving beam 6 and the drying room 5 to detect the moisture regain of the sized yarn 7 after it leaves the drying room 5. The moisture regain tester 10 is an existing device, such as the "A Novel Sizing Moisture Regain Detection System" disclosed in patent number "200510026664.6".

[0051] The central processing unit is a microcontroller 11. The central processing unit is electrically connected to the first encoder 3c, the second encoder 4d, the pressure sensor 2, the moisture regain tester 10, the sizing rate output module 12, and the human-machine interaction module 13. The first encoder 3c, the second encoder 4d, the pressure sensor 2, and the moisture regain tester 10 send the detected information to the microcontroller 11. After the microcontroller 11 completes the calculation, it outputs the calculation result through the sizing rate output module 12. The human-machine interaction module 13 is used to send instructions to the microcontroller 11.

[0052] The sizing rate output module uses a single-chip microcomputer 12 as a display or touch screen.

[0053] The human-computer interaction module uses a single-chip microcomputer 13, which can be either a touch screen or a keyboard.

[0054] Example 2:

[0055] Taking the above-mentioned online sizing rate detection device for sizing machines as a reference, this embodiment provides a detailed description of the online sizing rate detection method for sizing machines.

[0056] The online detection method for sizing rate of sizing machine includes the following specific steps:

[0057] a. Acquisition of yarn sizing parameters: Obtain the real-time weight m (t) of the warp beam, the moisture regain k (t) of the sizing yarn, the dry linear density S of the yarn, the total number of yarns to be sized N, and the overall elongation γ of the yarn. z And obtain the warp beam winding speed v. j (t) and / or warp unwinding speed v t (t), m(t) is in g, S is in g / km, v j The unit of (t) is m / s, v t The unit of (t) is m / s;

[0058] b. Sizing rate calculation: Calculate the current real-time yarn sizing rate s(t) according to the following formula (1):

[0059]

[0060] Where m 浆 (t) represents the dry weight of the sizing yarn, m 原 (t) is the dry weight of the raw yarn, which is calculated using the following formulas (2) and (3):

[0061]

[0062]

[0063] In formulas (2) and (3), Δt is the detection step size, preset according to the frequency of the sizing rate output by the user, and γ(t) is the yarn elongation at the current moment. t When γ(t) = 0, γ(t) is calculated using the following formula (4):

[0064]

[0065] γ z1 It is the elongation correction factor, which is calibrated through off-machine testing;

[0066] When unknown v t When γ(t) = 0, γ(t) is calculated using the following formula (5):

[0067] γ(t)=γ z2 (5);

[0068] Overall elongation γ z2 It refers to the total elongation of the yarn from unwinding to winding on the sizing machine, which is calibrated through off-machine testing.

[0069] c. Sizing rate output: The real-time yarn sizing rate s(t) calculated in step b is output through the output device.

[0070] The real-time weight m(t) of the warp beam 6 is detected and obtained by a pressure sensor 2 installed at the bottom of the bearing seat 1 of the sizing machine head; the moisture regain k(t) of the sizing yarn is detected and obtained by a moisture regain tester 10 installed between the drying chamber 5 and the warp beam 6; the dry linear density S of the yarn is the theoretical dry linear density or the measured actual linear density; the warp beam winding speed v j (t) The warp unwinding speed v is obtained by the first speed sensor 3 installed upstream of the warp beam of the sizing machine. t (t) is obtained by the second speed sensor 4 installed downstream of the warp shaft 8.

[0071] The first speed sensor 3 includes a first guide roller 3a disposed between the drying chamber 5 and the weaving beam 6, a speed measuring wheel 3b that is synchronously driven with the first guide roller 3a, and a first encoder 3c that is coaxially connected to one end of the speed measuring wheel 3b. The first encoder 3c is fixedly connected to the drying chamber 5. The two ends of the first guide roller 3a are respectively fixedly connected to the outer wall of the drying chamber 5 through the first support 3d. The sized yarn 7 dried by the drying chamber 5 is wound onto the weaving beam 6 after passing through the first guide roller 3a.

[0072] The second speed sensor 4 includes a second guide roller 4a disposed between the shaft frame 8 and the slurry 9, a swing arm 4b rotatably connected to one end of the second guide roller 4a, a servo motor 4c fixedly connected to the other end of the swing arm 4b, and a second encoder 4d coaxially connected to the second guide shaft 4a. The second encoder 4d is fixedly connected to the swing arm 4b.

[0073] In this embodiment, step d is also preferably included: expanding the output content: based on the real-time yarn sizing rate s(t) at each time t, the sizing rate result is output in the following manner:

[0074] 1) Output the sizing rate detection results at the current moment in real time.

[0075] 2) Output the average test results of the sizing rate over a period of time.

[0076] 3) Output a chart showing the trend of sizing rate over time.

[0077] 4) Output a chart showing the trend of sizing rate as a function of yarn running length. The specific calculation method includes converting any time t0 into the yarn running length L(t0) using the following formula.

[0078]

[0079] Where v is v j or v t ;

[0080] 5) Statistically analyze the average results of sizing rate tests on any warp beam. in:

[0081] Average results The calculation is performed in units of time t, and the calculation method is as follows:

[0082]

[0083] Where T is the end time of the warp beam winding;

[0084] or average result The calculation is based on the yarn running length L, and the calculation method is as follows:

[0085]

[0086] Where T is the end time of the warp beam winding, and v is v j or v t .

[0087] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some of the application examples, and are not intended to limit the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. An online detection method for sizing rate of a sizing machine, characterized in that, The specific steps include the following: a. Acquisition of yarn sizing parameters: Obtain the real-time weight m (t) of the warp beam, the moisture regain k (t) of the sizing yarn, the dry linear density S of the yarn, the total number of yarns to be sized N, and the overall elongation of the yarn. And obtain the warp beam winding speed. and / or warp unwinding speed The unit of m(t) is g, and the unit of S is g / km. The unit is m / s. The unit is m / s; b. Sizing rate calculation: Calculate the current real-time yarn sizing rate s(t) according to the following formula (1): （1）； in For the dry weight of sizing, The dry weight of the raw yarn is calculated using the following formulas (2) and (3): （2）； （3）； In formulas (2) and (3) The detection step size is preset based on the frequency of the sizing rate output by the user. Let the yarn elongation be the current moment, when it is known hour, Calculated using the following formula (4): （4）； It is the elongation correction factor, which is calibrated through off-machine testing; When the unknown hour, Calculated using the following formula (5): （5）； Overall elongation It refers to the total elongation of the yarn as it is unwound and wound on the sizing machine, which is calibrated through off-machine testing. c. Sizing rate output: The real-time yarn sizing rate s(t) calculated in step b is output through the output device.

2. The online detection method for sizing rate of a sizing machine according to claim 1, characterized in that, The real-time weight m(t) of the warp beam is detected and obtained by a pressure sensor installed at the bottom of the bearing seat of the sizing machine head; the moisture regain k(t) of the sizing is detected and obtained by a moisture regain sensor installed between the drying chamber and the warp beam; the dry linear density S of the yarn is the theoretical dry linear density or the measured actual linear density; the warp beam winding speed... The warp unwinding speed is obtained by a first speed sensor installed upstream of the warp beam of the sizing machine. The speed is obtained by a second speed sensor installed downstream of the warp beam.

3. The online detection method for sizing rate of a sizing machine according to claim 2, characterized in that, The first speed sensor includes a first guide roller disposed between the drying chamber and the warp beam, a speed measuring wheel that is synchronously driven with the first guide roller, and a first encoder coaxially connected to one end of the speed measuring wheel. The first encoder is fixedly disposed. The two ends of the first guide roller are respectively fixedly connected to the outer wall of the drying chamber through the first support. The sized yarn dried in the drying chamber passes through the first guide roller and is wound onto the warp beam. The second speed sensor includes a second guide roller disposed between the warp beam frame and the sizing tank, a swing arm that is rotatably connected to one end of the second guide roller, a servo motor that is fixedly connected to the other end of the swing arm, and a second encoder coaxially connected to the second guide shaft. The second encoder is fixedly connected to the swing arm.

4. The online detection method for sizing rate of a sizing machine according to claim 1, characterized in that, It also includes the following steps: d. Extended output content: based on each time point Real-time yarn sizing rate Output the sizing rate results in the following ways: 1) Real-time output of the sizing rate detection results at the current moment; 2) Output the average test results of sizing rate over a period of time; 3) Output a chart showing the trend of sizing rate over time; 4) Output a chart showing the trend of sizing rate as a function of yarn running length. The specific calculation method includes: [calculating the sizing rate at any given time]. The yarn running length can be converted using the following formula. , （7） Where v is or ; 5) Statistically analyze the average results of sizing rate tests on any warp beam. ,in: Average results The calculation is performed in units of time t, and the calculation method is as follows: （8） Where T is the end time of the warp beam winding; or average result The calculation is based on the yarn running length. The unit is used for calculation, and the method is as follows: （9） in This is the end point of the warp beam winding. for or .

5. An online sizing rate detection device for a sizing machine based on the online sizing rate detection method of any one of claims 1 to 4, characterized in that, It includes a warp beam weight sensing component, a machine speed sensing component, a moisture regain sensing component, a central computing unit, a sizing rate output module (12), and a human-machine interaction module (13). The weight sensing component is a pressure sensor (2) installed at the bottom of the bearing seat (1) of the sizing machine head. The pressure sensor (2) is used to detect the warp beam weight at any time. The vehicle speed sensing component includes a first speed sensor (3) and / or a second speed sensor (4). The first speed sensor (3) includes a first guide roller (3a) disposed between the drying chamber (5) and the weaving beam (6) and perpendicular to the yarn movement direction, a bearing seat (3b) for supporting both ends of the first guide roller (3a), and a first encoder (3c) coaxially connected to the first guide roller (3a). The housing of the first encoder (3c) is fixedly connected to the bearing seat (3b). The sized yarn (7) is wound onto the weaving beam (6) after passing through the first guide roller (3a). The second speed sensor (4) includes a second guide roller (4a) disposed between the warp beam frame (8) and the sizing trough (9) and perpendicular to the yarn movement direction, and a second encoder (4d) coaxially connected to the second guide roller (4a). The housing of the second encoder (4d) is fixedly disposed. The moisture regain sensing component is a moisture regain tester (10), which is set between the weaving beam (6) and the drying room (5) to detect the moisture regain of the sized yarn (7) after leaving the drying room (5); The central processing unit is a microcontroller (11). The central processing unit is electrically connected to the first encoder (3c), the second encoder (4d), the pressure sensor (2), the moisture regain tester (10), the sizing rate output module (12), and the human-machine interaction module (13). The first encoder (3c), the second encoder (4d), the pressure sensor (2), and the moisture regain tester (10) send the detected information to the microcontroller (11). After the microcontroller (11) completes the calculation, it outputs the calculation result through the sizing rate output module (12). The human-machine interaction module (13) is used to send instructions to the microcontroller (11). The sizing rate output module (12) is a display or a touch screen. The human-machine interaction module (13) is a touch screen or a keyboard.

6. The online sizing rate detection device for a sizing machine according to claim 5, characterized in that, The two ends of the second guide roller (4a) are rotatably connected to swing arms (4b), and the other ends of the two swing arms (4b) are respectively fixedly connected to the two ends of the output shaft of a dual-output shaft servo motor (4c). The second encoder (4d) is fixedly connected to one of the swing arms (4b). The servo motor (4c) can output a stable torque, thereby keeping the yarn under constant tension, so as to ensure that the second guide roller (4a) rotates synchronously with the yarn.

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