Sizing system and concentration control method of sizing system

Abstract

The invention relates to a sizing system and a concentration control method of the sizing system, and relates to the technical field of fiber tow production, and the sizing system comprises a sizing tank used for containing sizing liquid; the liquid level detection device is used for detecting the liquid level of the sizing liquid in the sizing tank and converting the liquid level of the sizing liquid into a liquid level signal; the concentration detection device is used for detecting the concentration of the sizing liquid in the sizing tank and converting the concentration of the sizing liquid into a concentration signal; the concentration adjusting device is used for introducing a thick sizing agent, sizing liquid or a solvent into the sizing tank so as to adjust the concentration of the sizing liquid in the sizing tank; and the controller is configured to receive the liquid level signal and the concentration signal, and control the concentration adjusting device to introduce the thick glue, the sizing liquid or the solvent into the sizing tank according to the preset concentration of the sizing liquid, the concentration of the sizing liquid and the liquid level of the sizing liquid, so that the control precision of the concentration of the sizing liquid is improved, and the stability of the sizing process is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of fiber bundle production, and in particular to a sizing system and a concentration control method of the sizing system. Background Art

[0002] Fiber tows have a series of excellent properties such as high modulus, high strength, low specific gravity, high temperature resistance, fatigue resistance, and corrosion resistance. The composite materials formed by them and advanced resins are widely used in the fields of modern aerospace cutting-edge technology, sports and leisure products, civil engineering, electronic products, medical equipment, etc.

[0003] The sizing process is the process of winding the fiber bundles into rolls after surface treatment. The main function of the sizing process is to bundle the fiber bundles, protect the fiber bundles, and reduce friction. At the same time, sizing can improve the chemical bonding between the fiber bundles and the resin, and improve the interface performance of the composite material. At present, in the preparation process of fiber bundles, the concentration in the sizing tank fluctuates due to various factors such as artificial glue preparation and volatilization of the sizing liquid, which affects the fluctuation of the glue content of the fiber bundles. At the same time, due to the fluctuation of the glue content of the fiber bundles, the chemical bonding stability between the fiber bundles and the resin is reduced, affecting the application effect of the fiber composite material. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the present application aims to provide a sizing system and a concentration control method of the sizing system.

[0005] According to the present application, a sizing system is provided, comprising:

[0006] A sizing tank, the sizing tank is used to contain sizing liquid;

[0007] A liquid level detection device, the liquid level detection device is used to detect the liquid level of the sizing liquid in the sizing tank and convert the liquid level of the sizing liquid into a liquid level signal;

[0008] A concentration detection device, the concentration detection device is used to detect the concentration of the sizing liquid in the sizing tank and convert the concentration of the sizing liquid into a concentration signal;

[0009] A concentration adjusting device, the concentration adjusting device is used to introduce a thick glue, a sizing liquid or a solvent into the sizing tank to adjust the concentration of the sizing liquid in the sizing tank;

[0010] A controller is configured to receive the liquid level signal and the concentration signal, and control the concentration adjustment device to introduce a thick glue agent, the sizing liquid or a solvent into the sizing tank according to a preset concentration of the sizing liquid, the sizing liquid concentration and the sizing liquid level.

[0011] In a possible implementation manner, the concentration of the sizing liquid in the concentrated glue agent is greater than the preset concentration;

[0012] The concentration of the sizing solution introduced into the sizing tank is the same as the preset concentration of the sizing solution;

[0013] The solvent introduced into the sizing tank is consistent with the solvent in the sizing solution.

[0014] In a possible embodiment, the controller is configured to, when it is detected that the sizing liquid concentration is lower than the preset concentration, determine the mass of the thick glue agent introduced into the sizing tank according to the mass of the sizing liquid in the sizing tank, the sizing liquid concentration and the preset concentration; and / or,

[0015] The controller is configured to determine the volume of the solvent introduced into the sizing tank according to the volume of the sizing tank, the sizing tank concentration and the preset concentration when it is detected that the sizing liquid concentration is higher than the preset concentration.

[0016] In a possible implementation manner, the liquid level detection device is disposed in the sizing tank, and the liquid level detection device extends along the height direction of the sizing tank;

[0017] At least two concentration detection devices are provided, and at least two concentration detection devices are distributed at the bottom of the sizing tank.

[0018] On the other hand, the present application provides a method for controlling the concentration of a sizing system, the control method comprising:

[0019] The controller receives the liquid level signal and the concentration signal;

[0020] According to the preset concentration, the sizing liquid concentration and the sizing liquid level, the concentration adjusting device is controlled to introduce the thick glue agent, the sizing liquid or the solvent into the sizing tank.

[0021] In a possible implementation, controlling the concentration adjustment device to introduce the thick glue agent, the sizing liquid or the solvent into the sizing tank according to the preset concentration, the sizing liquid concentration and the sizing liquid level includes:

[0022] When the sizing liquid concentration is lower than the preset concentration, the mass of the thick glue agent introduced into the sizing tank is determined according to the mass of the sizing liquid in the sizing tank, the sizing liquid concentration and the preset concentration.

[0023] In a possible implementation, determining the mass of the thick glue agent introduced into the sizing tank according to the mass of the sizing liquid in the sizing tank, the concentration of the sizing liquid and the preset concentration includes:

[0024] Determine the mass of the sizing solution according to the density and volume of the sizing solution, wherein the volume of the sizing solution is determined according to the level of the sizing solution and the size characteristic information of the sizing tank;

[0025] Determining the actual solute mass in the sizing tank and the solution mass in the sizing tank according to the sizing liquid mass and the sizing liquid concentration;

[0026] Determining the target solute mass after adding the thickening agent according to the mass of the solution in the sizing tank and the preset concentration;

[0027] The mass of the concentrated glue agent to be added is determined according to the difference between the target solute mass and the actual solute mass.

[0028] In a possible implementation, after adding the thick glue agent, the sizing system concentration control method further includes:

[0029] Sizing liquid is added into the sizing tank, and when the liquid level of the sizing liquid reaches the upper limit liquid level, the controller controls the concentration adjusting device to stop adding the sizing liquid.

[0030] In a possible implementation, the step of controlling the concentration adjusting device to introduce the thick glue agent, the sizing liquid or the solvent into the sizing tank according to the preset concentration, the sizing liquid concentration and the sizing liquid level further includes:

[0031] When the sizing solution concentration is higher than the preset concentration, determining the actual solute mass in the sizing tank according to the sizing solution volume and the sizing solution concentration in the sizing tank;

[0032] Determining the target volume of the sizing solution after adding the solvent according to the actual solute mass and the preset concentration;

[0033] The volume of the solvent to be introduced into the sizing tank is determined according to the difference between the target volume and the volume of the sizing liquid.

[0034] In a possible implementation, the step of controlling the concentration adjusting device to introduce the thick glue agent, the sizing liquid or the solvent into the sizing tank according to the preset concentration, the sizing liquid concentration and the sizing liquid level further includes:

[0035] When the difference between the sizing liquid concentration and the preset concentration is within a first interval, it is determined whether to introduce sizing liquid into the sizing tank according to the level of the sizing liquid in the sizing tank.

[0036] The advantages of the present application are: the present application can preset the preset concentration of the sizing liquid according to actual needs. When the detected concentration of the sizing liquid is lower than the preset concentration range, the controller controls the concentration adjustment device to pass the thick glue into the upper sizing tank to increase the concentration of the sizing liquid. When the detected concentration of the sizing liquid is higher than the preset concentration range, the controller controls the concentration adjustment device to pass the solvent into the upper sizing tank to reduce the concentration of the sizing liquid. At the same time, the controller can also control the amount of the concentration adjustment device to be passed according to the liquid level signal of the sizing liquid to maintain the stability of the liquid level of the sizing liquid. The present application not only improves the concentration accuracy of the sizing liquid, but also ensures the stability and continuity of the sizing process.

[0037] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. The purpose and other advantages of the present application can be realized and obtained by BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments of the present application and are used together with the description to explain the principles of the present application. In these drawings, similar reference numerals are used to identify similar elements. The drawings described below are some embodiments of the present application, rather than all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 is a front structural schematic diagram of a sizing system according to an exemplary embodiment;

[0040] Figure 2 is a schematic diagram of a top view of a sizing system according to an exemplary embodiment;

[0041] Figure 3 The process of the concentration control method of the sizing system according to an exemplary embodiment is shown Figure 1 ;

[0042] Figure 4 The process of the concentration control method of the sizing system according to an exemplary embodiment is shown Figure 2 ;

[0043] Figure 5 The process of the concentration control method of the sizing system according to an exemplary embodiment is shown Figure 3 .

[0044] Reference numerals:

[0045] 1. Liquid level detection device; 2. Concentration detection device; 3. Pressing roller; 4. Fiber bundle; 5. Sizing tank; 6. Overflow tank. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. It should be noted that, in the absence of conflict, the embodiments in the present application and the feature vectors in the embodiments can be arbitrarily combined with each other.

[0047] At present, in the preparation process of fiber tows, the sizing process is the process of winding the fiber tows into rolls after surface treatment. In the sizing process, the concentration in the sizing tank fluctuates due to various factors such as artificial glue preparation and volatilization of the sizing liquid, which affects the fluctuation of the glue content in the fiber tows. At the same time, due to the fluctuation of the glue content in the fiber tows, the chemical bonding stability between the fiber tows and the resin is reduced, affecting the application effect of the fiber composite material.

[0048] In order to solve the above technical problems, the present disclosure provides a sizing system, see Figure 1-Figure 5 The sizing system includes: a sizing tank, a liquid level detection device, a concentration detection device and a controller. The sizing tank is used to contain sizing liquid. The liquid level detection device is used to detect the liquid level of the sizing liquid in the sizing tank, and convert the liquid level of the sizing liquid into a liquid level signal. The concentration detection device is used to detect the concentration of the sizing liquid in the sizing tank, and convert the concentration of the sizing liquid into a concentration signal. The concentration adjustment device is used to pass a thick glue agent, sizing liquid or solvent into the sizing tank to adjust the concentration of the sizing liquid in the sizing tank. The controller is configured to receive a liquid level signal and a concentration signal, and control the concentration adjustment device to pass a thick glue agent, sizing liquid or solvent into the sizing tank according to a preset concentration of the sizing liquid, the concentration of the sizing liquid and the liquid level of the sizing liquid. The present application can realize automatic adjustment of the liquid level and concentration of the sizing tank in the sizing process of the fiber bundle preparation process, which can prevent degumming problems caused by changes in the sizing liquid concentration on the one hand, and improve the glue stability of the sizing liquid in the sizing tank on the other hand, thereby effectively improving the apparent quality of the fiber bundle, improving the quality stability of the fiber bundle product, and effectively improving the degree of automation of the fiber bundle production.

[0049] An exemplary embodiment of the present application provides a sizing system, which includes: a sizing tank 5, a liquid level detection device 1, a concentration detection device 2 and a controller.

[0050] The sizing tank 5 is used to contain sizing liquid. For example, in the sizing process of the fiber bundle 4, at least two pressing rollers 3 are arranged above the sizing tank 5. The fiber bundle 4 abuts against the pressing rollers 3. The pressing rollers 3 press the fiber bundle 4 down into the sizing liquid in the sizing tank 5. The fiber bundle 4 is immersed in the sizing liquid for sizing. The fiber bundle 4 can be set as carbon fiber.

[0051] The liquid level detection device 1 is used to detect the sizing liquid level in the sizing tank 5 and convert the sizing liquid level into a liquid level signal. The liquid level detection device 1 can be set as a liquid level detector. A lower limit liquid level Aa and an upper limit liquid level Ab are set in the sizing tank 5. When the sizing liquid level is lower than the lower limit liquid level Aa, the fiber bundle 4 is degummed, the fiber bundle 4 cannot be immersed in the sizing liquid, and the fiber bundle 4 cannot be effectively sized, which affects the sizing quality of the fiber bundle 4. When the sizing liquid level is higher than the upper limit liquid level, the sizing liquid may overflow the sizing tank 5, there is an overflow risk, and the sizing liquid is wasted. Therefore, by real-time detection of the sizing liquid level by the liquid level detection device 1, and controlling the sizing liquid level between the lower limit liquid level Aa and the upper limit liquid level Ab, the overflow of the sizing liquid can be effectively avoided, while ensuring that the fiber bundle 4 can be fully immersed in the sizing liquid, preventing the fiber bundle 4 from degumming due to the low liquid level in the sizing tank 5, and improving the sizing quality and efficiency.

[0052] The concentration detection device 2 is used to detect the concentration of the sizing liquid in the sizing tank 5 and convert the concentration of the sizing liquid into a concentration signal. The concentration detection device 2 can be set as a concentration detector.

[0053] In some embodiments, at least two concentration detection devices 2 are provided, and at least two concentration detection devices 2 are distributed at the bottom of the sizing tank 5, so as to reduce the concentration detection error. Exemplarily, four concentration detection devices 2 are provided, and the four concentration detection devices 2 are distributed at different positions in the sizing tank 5, so as to detect the concentration at different positions, and reduce the concentration detection error by calculating the average value of the concentration at different positions.

[0054] In some embodiments, the concentration adjusting device is used to introduce a thick glue, sizing liquid or solvent into the upper sizing tank 5 to adjust the concentration of the sizing liquid in the upper sizing tank 5 .

[0055] In some embodiments, the controller is electrically connected to the liquid level detection device 1, the concentration detection device 2 and the concentration adjustment device, respectively, and the controller is configured to receive the liquid level signal and the concentration signal, and control the concentration adjustment device to introduce the thick glue agent, the sizing liquid or the solvent into the upper sizing tank 5 according to the preset concentration of the sizing liquid, the sizing liquid concentration and the sizing liquid level. Exemplarily, the controller can be set as a DSC control system, and the controller is part of the computer.

[0056] The controller obtains the current sizing liquid level and sizing liquid concentration in the sizing tank 5 based on the received liquid level signal and concentration signal. The controller sends an adjustment instruction to the concentration adjustment device after calculation based on the preset concentration of the sizing liquid, the sizing liquid concentration and the sizing liquid level. The concentration adjustment device is used to adjust the addition of thick glue, sizing liquid or solvent according to the adjustment instruction of the controller, thereby realizing the adjustment of the sizing liquid level and concentration in the sizing tank 5.

[0057] In this embodiment, the preset concentration of the sizing solution can be preset according to actual needs. When the detected concentration of the sizing solution is lower than the preset concentration range, the controller controls the concentration adjustment device to pass the thick glue into the upper sizing tank 5 to increase the concentration of the sizing solution. When the detected concentration of the sizing solution is higher than the preset concentration range, the controller controls the concentration adjustment device to pass the solvent into the upper sizing tank 5 to reduce the concentration of the sizing solution. At the same time, the controller can also control the amount of the concentration adjustment device to be passed according to the liquid level signal of the sizing solution to maintain the stability of the liquid level and concentration of the sizing solution. This intelligent adjustment method not only improves the concentration accuracy of the sizing solution, but also ensures the stability and continuity of the sizing process.

[0058] In some embodiments, the concentration of the sizing liquid in the thick glue agent is greater than the preset concentration, so that when the concentration of the sizing liquid is lower than the preset concentration, the controller controls the amount of the thick glue agent added to quickly increase the concentration of the sizing liquid to the preset concentration. In addition, the high concentration design of the thick glue agent can also ensure that during the adjustment process, even if a small amount of the thick glue agent is added, a significant concentration increase effect can be produced, thereby improving the adjustment efficiency.

[0059] In some embodiments, the concentration of the sizing liquid introduced into the sizing tank 5 is the same as the preset concentration of the sizing liquid, so that when the current sizing liquid concentration does not need to be adjusted, the system can still maintain stable operation after adding the sizing liquid, avoiding unnecessary concentration fluctuations and reducing the waste and time loss caused by frequent concentration adjustments.

[0060] In some embodiments, the concentration adjustment device includes: a thick glue pipeline, a sizing liquid pipeline and a solvent pipeline, the thick glue pipeline is used to pass the thick glue agent into the upper sizing tank 5, the sizing liquid pipeline is used to pass the sizing liquid into the upper sizing tank 5, and the solvent pipeline is used to pass the solvent into the upper sizing tank 5. The thick glue pipeline, the sizing liquid pipeline and the solvent pipeline are all provided with flow meters connected to the controller, and the addition amount of the thick glue agent, the sizing liquid and the solvent can be controlled and adjusted by the flow meters.

[0061] In some embodiments, the solvent introduced into the sizing tank 5 is consistent with the solvent in the sizing liquid. Such a design helps to maintain the stability and uniformity of the sizing liquid and ensure the consistency and high quality of the sizing effect.

[0062] In some embodiments, the sizing tank 5 is in a rectangular shape, and the bottom length of the sizing tank 5 is defined as c, the width is d, and the height is b. The real-time sizing liquid level height in the sizing tank 5 monitored by the liquid level detection device 1 is a, and the volume of the sizing tank 5 V1 = c*d*b can be obtained by calculation. The real-time sizing liquid volume in the sizing tank 5 is V2 = c*d*a.

[0063] In some embodiments, the controller is configured to determine the mass of the glue concentrate introduced into the sizing tank 5 based on the mass of the sizing liquid in the sizing tank 5, the sizing liquid concentration and the preset concentration when it is detected that the sizing liquid concentration is lower than the preset concentration.

[0064] In this step, the controller calculates according to the parameters to determine the mass of the thick glue agent introduced into the sizing tank 5, and the controller controls the concentration adjustment device to introduce the thick glue agent into the sizing tank 5 to increase the concentration of the sizing solution. A flow meter connected to the controller is provided in the thick glue pipeline. When the flow meter detects that the required amount of the thick glue agent is reached, the controller controls the concentration adjustment device to stop adding the thick glue agent. The automated adjustment method improves the control accuracy of the sizing solution concentration, thereby improving the sizing quality.

[0065] In some embodiments, when it is detected that the sizing liquid concentration is lower than a preset concentration, the mass of the thick glue agent introduced into the sizing tank 5 is determined according to the mass of the sizing liquid in the sizing tank 5, the sizing liquid concentration and the preset concentration, specifically comprising the following steps:

[0066] S211. Determine the quality of the sizing liquid according to the density and volume of the sizing liquid, wherein the volume of the sizing liquid is determined according to the liquid level of the sizing liquid and the size characteristic information of the sizing tank.

[0067] In this step, the quality of the sizing liquid is determined based on the density and volume of the sizing liquid. Exemplarily, the water content in the sizing liquid accounts for about 99%, and the density of the sizing liquid is close to the density of water. In the calculation process, the density of the sizing liquid is replaced by the density parameter of water. The volume of the sizing liquid is determined based on the sizing liquid level and the size characteristic information of the sizing tank 5. The sizing tank 5 is in the shape of a rectangular parallelepiped, and the bottom length of the sizing tank 5 is defined as c, the width is d, and the height is b. The real-time sizing liquid level height in the sizing tank 5 monitored by the liquid level detection device 1 is a, and the volume of the sizing tank 5 V1=c*d*b can be obtained by calculation. The real-time sizing liquid volume in the sizing tank 5 is V2=c*d*a. The density of the sizing liquid is multiplied by the volume of the sizing liquid to determine the quality of the sizing liquid.

[0068] S212. Determine the actual solute mass in the sizing tank and the mass of the solution in the sizing tank according to the mass and concentration of the sizing liquid.

[0069] In this step, the actual solute mass in the sizing tank 5 is defined as m1, the actual solvent mass in the sizing tank 5 is defined as m, the sizing liquid concentration is defined as C1, and the sizing liquid mass in the sizing tank 5 is defined as (m1+m). According to the formula C1=m1 / (m1+m), the sizing liquid concentration C1 and the sizing liquid mass (m1+m) detected by the concentration detection device 2 are substituted into the formula to calculate the actual solute mass m1 and the actual solvent mass m in the sizing tank 5 at this time.

[0070] S213, determining the target solute mass after adding the thickening agent according to the solution mass in the sizing tank and the preset concentration.

[0071] In this step, the preset concentration is defined as C2, the target solute mass is m2, the actual solvent mass in the sizing tank 5 is m, and the mass of the sizing liquid after the concentrated glue is added to the sizing tank 5 is defined as (m2+m). According to the formula C2=m2 / (m2+m), the preset concentration C2 and the actual solvent mass m in the sizing tank 5 are substituted into the formula to calculate the target solute mass m2.

[0072] S214. Determine the mass of the concentrated glue to be added based on the difference between the target solute mass and the actual solute mass.

[0073] In this step, the target solute mass m2 is subtracted from the actual solute mass m1 in the sizing tank 5 to calculate the mass of the thick glue agent that needs to be supplemented, and the controller controls the concentration adjustment device to pass the mass of the thick glue agent into the upper sizing tank 5 according to the calculation result. Exemplarily, the thick glue agent is passed into the upper sizing tank 5 through a thick glue pipeline, and a flow meter is provided in the thick glue pipeline, and the flow meter is used to detect the volume of the introduced thick glue agent.

[0074] The controller can determine the volume of the concentrated glue that needs to be replenished based on the density of the concentrated glue by the mass of the concentrated glue that needs to be replenished. When the flow meter detects that the volume of the concentrated glue introduced into the sizing tank 5 is equal to the volume of the concentrated glue that needs to be replenished, the controller controls the concentration adjustment device to stop introducing the concentrated glue into the sizing tank 5, so as to improve the automated control of the sizing liquid concentration and improve the control accuracy of the sizing liquid concentration in the sizing tank 5.

[0075] In this embodiment, when the detected sizing liquid concentration is lower than the preset concentration range, the controller determines the mass of the thick glue introduced into the sizing tank 5 according to the mass of the sizing liquid in the sizing tank 5, the sizing liquid concentration and the preset concentration, so that the sizing liquid concentration in the sizing tank 5 can be automatically controlled, thereby improving the concentration control accuracy and thus improving the sizing quality.

[0076] In some embodiments, the controller is configured to determine the volume of the solvent introduced into the sizing tank 5 according to the sizing liquid volume, the sizing liquid concentration and the preset concentration in the sizing tank 5 when it is detected that the sizing liquid concentration is higher than the preset concentration.

[0077] In this step, the controller calculates according to the parameters to determine the volume of the solvent introduced into the sizing tank 5, and the controller controls the concentration adjusting device to introduce the solvent into the sizing tank 5 to reduce the concentration of the sizing solution.

[0078] The liquid level detection device 1 monitors the liquid level in the sizing tank 5 in real time and converts the sizing liquid level into a liquid level signal and transmits it to the controller. The controller determines whether the volume of solvent to be added is reached according to the liquid level change. When the liquid level corresponding to the volume of solvent to be added is reached, the controller controls the concentration adjustment device to stop adding solvent, thereby improving the automated control of the sizing liquid concentration in the sizing tank 5, improving the concentration control accuracy, and thus improving the sizing quality.

[0079] In some embodiments, when it is detected that the concentration of the sizing liquid is higher than the preset concentration, the volume of the solvent introduced into the sizing tank 5 is determined according to the volume of the sizing liquid in the sizing tank 5, the concentration of the sizing liquid and the preset concentration, specifically comprising the following steps:

[0080] Step S221: When the sizing solution concentration is higher than a preset concentration, the actual solute mass in the sizing tank is determined according to the sizing solution volume and the sizing solution concentration in the sizing tank.

[0081] In this step, the volume of the sizing liquid in the sizing tank 5 is defined as V2, the concentration of the sizing liquid is C1, the actual solute mass in the sizing tank 5 is m1, the sizing tank 5 is in the shape of a rectangular parallelepiped, and the bottom length of the sizing tank 5 is defined as c, the width is d, and the height is b. The real-time sizing liquid level height in the sizing tank 5 monitored by the liquid level detection device 1 is a, and the volume of the sizing tank 5 V1=c*d*b can be obtained by calculation. The real-time sizing liquid volume in the sizing tank 5 is V2=c*d*a. According to the formula C1*V2=m1, the sizing liquid concentration C1 is multiplied by the sizing liquid volume V2 to determine the actual solute mass m1 in the sizing tank 5.

[0082] Step S222: Determine the target volume of the sizing solution after adding the solvent according to the actual solute mass and the preset concentration.

[0083] In this step, the preset concentration is defined as C2, the actual solute mass is defined as m1, and the target volume of the sizing solution after adding the solvent is defined as V3. According to the formula C2*V3=m1, the actual solute mass m1 is divided by the preset concentration C2 to determine the target volume V3 of the sizing solution after adding the solvent.

[0084] Step S223: Determine the volume of the solvent to be introduced into the sizing tank according to the difference between the target volume and the sizing liquid volume.

[0085] In this step, the volume (V3-V2) of the solvent to be introduced into the sizing tank 5 is obtained by subtracting the target volume V3 from the sizing liquid volume V2. The controller controls the concentration adjusting device to introduce the volume of the solvent into the sizing tank 5 according to the calculation result.

[0086] Exemplarily, the solvent is introduced into the upper slurry tank 5 through a solvent pipeline, and a flow meter is provided in the solvent pipeline, and the flow meter is used to detect the volume of the introduced solvent.

[0087] When the flow meter detects that the volume of the solvent introduced into the sizing tank 5 is equal to the volume of the solvent required to be introduced, the controller controls the concentration adjustment device to stop introducing the solvent into the sizing tank 5, so as to improve the automation control of the concentration adjustment and improve the control accuracy of the sizing liquid concentration in the sizing tank 5.

[0088] In some embodiments, the controller is configured to determine whether to introduce sizing liquid into the upper sizing tank 5 according to the sizing liquid level in the sizing tank 5 when the difference between the sizing liquid concentration and the preset concentration is within a first interval.

[0089] Since there are slight errors in the sizing solution concentration at various locations in the sizing tank 5, when the difference between the sizing solution concentration and the preset concentration is within the first interval, it can be considered that the sizing solution concentration is consistent with the preset concentration, and the concentration range of the first interval can be selected according to actual conditions.

[0090] The liquid level detection device 1 transmits a liquid level signal to the controller in real time. When the liquid level detection device 1 detects that the sizing liquid level is lower than the lower limit liquid level Aa, the controller controls the concentration adjustment device to pass the sizing liquid into the upper sizing tank 5. When the sizing liquid level reaches the upper limit liquid level Ab, the controller controls the concentration adjustment device to stop passing the sizing liquid into the upper sizing tank 5 to prevent the sizing liquid from overflowing the sizing tank 5.

[0091] In some embodiments, the liquid level detection device 1 is disposed in the sizing tank 5. The liquid level detection device 1 extends along the height direction of the sizing tank 5. The liquid level detection device 1 can be configured as a liquid level detection meter.

[0092] At least two concentration detection devices 2 are provided, and at least two concentration detection devices 2 are distributed at the bottom of the sizing tank 5, so as to detect the concentration of the sizing liquid at different positions in the sizing tank 5. The concentration of the sizing liquid in the sizing tank 5 is the average value of the concentrations detected by the concentration detection devices 2 at different positions, so as to avoid the calculation error caused by the large concentration fluctuation at a certain position, thereby improving the control accuracy of the sizing liquid concentration. Exemplarily, the concentration detection device 2 can be set as a concentration detector, and four concentration detectors are dispersedly arranged at the bottom of the sizing tank 5.

[0093] In some embodiments, the sizing tank 5 is provided with an overflow tank 6 and an overflow sizing liquid circulation storage tank, which can prevent the sizing liquid from bubbling when abnormalities occur during the liquid level and concentration adjustment process.

[0094] An exemplary embodiment of the present application provides a method for controlling the concentration of a sizing system, see Figure 1-Figure 5 The sizing system concentration control method is applied to the sizing system as described above, and the sizing system concentration control method comprises the following steps:

[0095] S100, the controller receives a liquid level signal and a concentration signal.

[0096] S200, controlling the concentration adjusting device to introduce the thick glue, sizing liquid or solvent into the upper sizing tank according to the preset concentration, sizing liquid concentration and sizing liquid level.

[0097] The controller obtains the current sizing liquid level and sizing liquid concentration in the sizing tank 5 according to the received liquid level signal and concentration signal. The controller sends an adjustment instruction to the concentration adjustment device after calculation according to the preset concentration of the sizing liquid, the sizing liquid concentration and the sizing liquid level. The concentration adjustment device is used to adjust the thick glue, sizing liquid or solvent to be added to the sizing tank 5 according to the adjustment instruction of the controller, thereby adjusting the sizing liquid level and concentration in the sizing tank 5 to maintain the stability of the sizing liquid level and concentration. The control method of this embodiment not only improves the concentration accuracy of the sizing liquid, but also ensures the stability and continuity of the sizing process.

[0098] In some embodiments, according to the preset concentration, the sizing liquid concentration and the sizing liquid level, the concentration adjustment device is controlled to introduce the thick glue agent, the sizing liquid or the solvent into the upper sizing tank 5, which specifically includes the following steps:

[0099] S210. When the sizing liquid concentration is lower than a preset concentration, the mass of the thick glue introduced into the sizing tank is determined according to the mass of the sizing liquid in the sizing tank, the sizing liquid concentration and the preset concentration.

[0100] In this step, the controller calculates according to the parameters to determine the mass of the thick glue agent introduced into the sizing tank 5, and the controller controls the concentration adjustment device to introduce the thick glue agent into the sizing tank 5 to increase the concentration of the sizing solution. A flow meter connected to the controller is provided in the thick glue pipeline. When the flow meter detects that the required amount of the thick glue agent is reached, the controller controls the concentration adjustment device to stop adding the thick glue agent. The automated adjustment method improves the control accuracy of the sizing solution concentration, thereby improving the sizing quality.

[0101] In some embodiments, when it is detected that the sizing liquid concentration is lower than a preset concentration, the mass of the thick glue agent introduced into the sizing tank 5 is determined according to the mass of the sizing liquid in the sizing tank 5, the sizing liquid concentration and the preset concentration, specifically comprising the following steps:

[0102] S211. Determine the quality of the sizing liquid according to the density and volume of the sizing liquid, wherein the volume of the sizing liquid is determined according to the liquid level of the sizing liquid and the size characteristic information of the sizing tank.

[0103] In this step, the quality of the sizing liquid is determined based on the density and volume of the sizing liquid. Exemplarily, the water content in the sizing liquid accounts for about 99%, and the density of the sizing liquid is close to the density of water. In the calculation process, the density of the sizing liquid is replaced by the density parameter of water. The volume of the sizing liquid is determined based on the sizing liquid level and the size characteristic information of the sizing tank 5. The sizing tank 5 is in the shape of a rectangular parallelepiped, and the bottom length of the sizing tank 5 is defined as c, the width is d, and the height is b. The real-time sizing liquid level height in the sizing tank 5 monitored by the liquid level detection device 1 is a, and the volume of the sizing tank 5 V1=c*d*b can be obtained by calculation. The real-time sizing liquid volume in the sizing tank 5 is V2=c*d*a. The density of the sizing liquid is multiplied by the volume of the sizing liquid to determine the quality of the sizing liquid.

[0104] S212. Determine the actual solute mass in the sizing tank and the mass of the solution in the sizing tank according to the mass and concentration of the sizing liquid.

[0105] In this step, the actual solute mass in the sizing tank 5 is defined as m1, the actual solvent mass in the sizing tank 5 is defined as m, the sizing liquid concentration is defined as C1, and the sizing liquid mass in the sizing tank 5 is defined as (m1+m). According to the formula C1=m1 / (m1+m), the sizing liquid concentration C1 and the sizing liquid mass (m1+m) detected by the concentration detection device 2 are substituted into the formula to calculate the actual solute mass m1 and the actual solvent mass m in the sizing tank 5 at this time.

[0106] S213, determining the target solute mass after adding the thickening agent according to the solution mass in the sizing tank and the preset concentration.

[0107] In this step, the preset concentration is defined as C2, the target solute mass is m2, the actual solvent mass in the sizing tank 5 is m, and the mass of the sizing liquid after the concentrated glue is added to the sizing tank 5 is defined as (m2+m). According to the formula C2=m2 / (m2+m), the preset concentration C2 and the actual solvent mass m in the sizing tank 5 are substituted into the formula to calculate the target solute mass m2.

[0108] S214. Determine the mass of the concentrated glue to be added based on the difference between the target solute mass and the actual solute mass.

[0109] In this step, the target solute mass m2 is subtracted from the actual solute mass m1 in the sizing tank 5 to calculate the mass of the thick glue agent that needs to be supplemented, and the controller controls the concentration adjustment device to pass the mass of the thick glue agent into the upper sizing tank 5 according to the calculation result. Exemplarily, the thick glue agent is passed into the upper sizing tank 5 through a thick glue pipeline, and a flow meter is provided in the thick glue pipeline, and the flow meter is used to detect the volume of the introduced thick glue agent.

[0110] The controller can determine the volume of the concentrated glue that needs to be replenished based on the density of the concentrated glue by the mass of the concentrated glue that needs to be replenished. When the flow meter detects that the volume of the concentrated glue introduced into the sizing tank 5 is equal to the volume of the concentrated glue that needs to be replenished, the controller controls the concentration adjustment device to stop introducing the concentrated glue into the sizing tank 5, so as to improve the automated control of the sizing liquid concentration and improve the control accuracy of the sizing liquid concentration in the sizing tank 5.

[0111] In some embodiments, the controller is configured to determine the target liquid level after the concentrated glue is introduced into the sizing tank 5 according to the volume of the concentrated glue to be introduced into the sizing tank 5 and the size characteristic information of the sizing tank 5. The liquid level detection device 1 monitors the sizing liquid level in real time. When the sizing liquid level reaches the target liquid level, the liquid level detection device 1 sends a liquid level signal to the controller, and the controller controls the concentration adjustment device to stop adding the concentrated glue to complete the adjustment process.

[0112] The liquid level detection device 1 and the flow meter jointly detect the thick glue added into the sizing tank 5, which can play a verification effect, prevent the amount of thick glue added from being affected by errors and external interference, and improve the control accuracy of the sizing liquid concentration.

[0113] In some embodiments, step S214 is executed, and after the thick glue agent is added, the controller controls the concentration adjustment device to stop introducing the thick glue agent into the upper slurry tank, and step S215 is executed.

[0114] S215, adding sizing liquid into the upper sizing tank, when the liquid level of the sizing liquid reaches the upper limit liquid level, the controller controls the concentration adjustment device to stop adding the sizing liquid.

[0115] In this embodiment, the sizing liquid in the sizing tank 5 is added to the upper limit liquid level to improve the sizing effect of the fiber bundle.

[0116] In this embodiment, when the detected sizing liquid concentration is lower than the preset concentration range, the controller determines the mass of the thick glue introduced into the sizing tank 5 according to the mass of the sizing liquid in the sizing tank 5, the sizing liquid concentration and the preset concentration, so that the sizing liquid concentration in the sizing tank 5 can be automatically controlled, thereby improving the concentration control accuracy and thus improving the sizing quality.

[0117] In some embodiments, according to the preset concentration, the sizing liquid concentration and the sizing liquid level, the concentration adjustment device is controlled to introduce the thick glue agent, the sizing liquid or the solvent into the upper sizing tank 5, which specifically includes the following steps:

[0118] S220. When it is detected that the concentration of the sizing liquid is higher than the preset concentration, the volume of the solvent introduced into the sizing tank is determined according to the volume of the sizing liquid in the sizing tank, the concentration of the sizing liquid and the preset concentration.

[0119] In this step, the controller calculates according to the parameters to determine the volume of the solvent introduced into the sizing tank 5, and the controller controls the concentration adjusting device to introduce the solvent into the sizing tank 5 to reduce the concentration of the sizing solution.

[0120] The liquid level detection device 1 monitors the liquid level in the sizing tank 5 in real time and converts the sizing liquid level into a liquid level signal and transmits it to the controller. The controller determines whether the volume of solvent to be added is reached according to the liquid level change. When the liquid level corresponding to the volume of solvent to be added is reached, the controller controls the concentration adjustment device to stop adding solvent, thereby improving the automated control of the sizing liquid concentration in the sizing tank 5, improving the concentration control accuracy, and thus improving the sizing quality.

[0121] In some embodiments, when it is detected that the concentration of the sizing liquid is higher than the preset concentration, the volume of the solvent introduced into the sizing tank 5 is determined according to the volume of the sizing liquid in the sizing tank 5, the concentration of the sizing liquid and the preset concentration, specifically comprising the following steps:

[0122] S221. When the sizing solution concentration is higher than a preset concentration, the actual solute mass in the sizing tank is determined according to the sizing solution volume and the sizing solution concentration in the sizing tank.

[0123] In this step, the volume of the sizing liquid in the sizing tank 5 is defined as V2, the concentration of the sizing liquid is C1, the actual solute mass in the sizing tank 5 is m1, the sizing tank 5 is in the shape of a rectangular parallelepiped, and the bottom length of the sizing tank 5 is defined as c, the width is d, and the height is b. The real-time sizing liquid level height in the sizing tank 5 monitored by the liquid level detection device 1 is a, and the volume of the sizing tank 5 V1=c*d*b can be obtained by calculation. The real-time sizing liquid volume in the sizing tank 5 is V2=c*d*a. According to the formula C1*V2=m1, the sizing liquid concentration C1 is multiplied by the sizing liquid volume V2 to determine the actual solute mass m1 in the sizing tank 5.

[0124] S222. Determine the target volume of the sizing solution after adding the solvent according to the actual solute mass and the preset concentration.

[0125] In this step, the preset concentration is defined as C2, the actual solute mass is defined as m1, and the target volume of the sizing solution after adding the solvent is defined as V3. According to the formula C2*V3=m1, the actual solute mass m1 is divided by the preset concentration C2 to determine the target volume V3 of the sizing solution after adding the solvent.

[0126] S223, determining the volume of the solvent to be introduced into the sizing tank according to the difference between the target volume and the sizing liquid volume.

[0127] In this step, the volume (V3-V2) of the solvent to be introduced into the sizing tank 5 is obtained by subtracting the target volume V3 from the sizing liquid volume V2. The controller controls the concentration adjusting device to introduce the volume of the solvent into the sizing tank 5 according to the calculation result.

[0128] Exemplarily, the solvent is introduced into the upper slurry tank 5 through a solvent pipeline, and a flow meter is provided in the solvent pipeline, and the flow meter is used to detect the volume of the introduced solvent.

[0129] When the flow meter detects that the volume of the solvent introduced into the sizing tank 5 is equal to the volume of the solvent required to be introduced, the controller controls the concentration adjustment device to stop introducing the solvent into the sizing tank 5, so as to improve the automation control of the concentration adjustment and improve the control accuracy of the sizing liquid concentration in the sizing tank 5.

[0130] In some embodiments, the controller is configured to determine the target liquid level after the solvent is introduced into the sizing tank 5 according to the volume (V3-V2) of the solvent to be introduced into the sizing tank 5 and the size characteristic information of the sizing tank 5. The liquid level detection device 1 monitors the sizing liquid level in real time. When the sizing liquid level reaches the target liquid level, the liquid level detection device 1 sends a liquid level signal to the controller, and the controller controls the concentration adjustment device to stop adding the solvent, thereby completing the adjustment process.

[0131] The liquid level detection device 1 and the flow meter are used to jointly detect the solvent added into the sizing tank 5, which can play a verification effect, prevent the amount of solvent added from being affected by errors and external interference, and improve the control accuracy of the sizing liquid concentration.

[0132] In some embodiments, according to the preset concentration, the sizing liquid concentration and the sizing liquid level, the concentration adjustment device is controlled to introduce the thick glue agent, the sizing liquid or the solvent into the upper sizing tank 5, which specifically includes the following steps:

[0133] S230: When the difference between the sizing liquid concentration and the preset concentration is within the first interval, determine whether to introduce the sizing liquid into the sizing tank according to the level of the sizing liquid in the sizing tank.

[0134] Since there are slight errors in the sizing solution concentration at various locations in the sizing tank 5, when the difference between the sizing solution concentration and the preset concentration is within the first interval, it can be considered that the sizing solution concentration is consistent with the preset concentration, and the concentration range of the first interval can be selected according to actual conditions.

[0135] The liquid level detection device 1 transmits a liquid level signal to the controller in real time. When the liquid level detection device 1 detects that the sizing liquid level is lower than the lower limit liquid level Aa, the controller controls the concentration adjustment device to pass the sizing liquid into the upper sizing tank 5. When the sizing liquid level reaches the upper limit liquid level Ab, the controller controls the concentration adjustment device to stop passing the sizing liquid into the upper sizing tank 5 to prevent the sizing liquid from overflowing the sizing tank 5.

[0136] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device comprising the elements.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. The present application is described in detail with reference to the preferred embodiments only. Those skilled in the art should understand that the technical solution of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application, and should be included in the scope of the claims of the present application.

Claims

1. A sizing system, characterized in that: include: A sizing tank, the sizing tank is used to contain sizing liquid; A liquid level detection device, the liquid level detection device is used to detect the liquid level of the sizing liquid in the sizing tank and convert the liquid level of the sizing liquid into a liquid level signal; A concentration detection device, the concentration detection device is used to detect the concentration of the sizing liquid in the sizing tank and convert the concentration of the sizing liquid into a concentration signal; A concentration adjusting device, the concentration adjusting device is used to introduce a thick glue, a sizing liquid or a solvent into the sizing tank to adjust the concentration of the sizing liquid in the sizing tank; A controller is configured to receive the liquid level signal and the concentration signal, and control the concentration adjustment device to introduce a thick glue agent, the sizing liquid or a solvent into the sizing tank according to a preset concentration of the sizing liquid, the sizing liquid concentration and the sizing liquid level.

2. The sizing system according to claim 1, characterized in that: The concentration of the sizing liquid in the concentrated glue agent is greater than the preset concentration; The concentration of the sizing solution introduced into the sizing tank is the same as the preset concentration of the sizing solution; The solvent introduced into the sizing tank is consistent with the solvent in the sizing solution.

3. The sizing system according to claim 1, characterized in that: The controller is configured to determine the mass of the thick glue agent introduced into the sizing tank according to the mass of the sizing tank, the sizing tank concentration and the preset concentration when it is detected that the sizing liquid concentration is lower than the preset concentration; and / or, The controller is configured to determine the volume of the solvent introduced into the sizing tank according to the volume of the sizing tank, the sizing tank concentration and the preset concentration when it is detected that the sizing liquid concentration is higher than the preset concentration.

4. The sizing system according to claim 1, characterized in that: The liquid level detection device is arranged in the sizing tank, and the liquid level detection device extends along the height direction of the sizing tank; At least two concentration detection devices are provided, and at least two concentration detection devices are distributed at the bottom of the sizing tank.

5. A sizing system concentration control method, applied to the sizing system as claimed in any one of claims 1 to 4, characterized in that: The control method comprises: The controller receives the liquid level signal and the concentration signal; According to the preset concentration, the sizing liquid concentration and the sizing liquid level, the concentration adjusting device is controlled to introduce the thick glue agent, the sizing liquid or the solvent into the sizing tank.

6. The method for controlling the concentration of a sizing system according to claim 5, characterized in that: The method of controlling the concentration adjusting device to introduce the thick glue agent, the sizing liquid or the solvent into the sizing tank according to the preset concentration, the sizing liquid concentration and the sizing liquid level comprises: When the sizing liquid concentration is lower than the preset concentration, the mass of the thick glue agent introduced into the sizing tank is determined according to the mass of the sizing liquid in the sizing tank, the sizing liquid concentration and the preset concentration.

7. The method for controlling the concentration of a sizing system according to claim 6, characterized in that: The method of determining the mass of the thick glue agent introduced into the sizing tank according to the mass of the sizing liquid in the sizing tank, the concentration of the sizing liquid and the preset concentration comprises: Determine the mass of the sizing solution according to the density and volume of the sizing solution, wherein the volume of the sizing solution is determined according to the level of the sizing solution and the size characteristic information of the sizing tank; Determining the actual solute mass in the sizing tank and the solution mass in the sizing tank according to the sizing liquid mass and the sizing liquid concentration; Determining the target solute mass after adding the thickening agent according to the mass of the solution in the sizing tank and the preset concentration; The mass of the concentrated glue agent to be added is determined according to the difference between the target solute mass and the actual solute mass.

8. The method for controlling the concentration of a sizing system according to claim 7, characterized in that: After adding the thick glue agent, the sizing system concentration control method further comprises: Sizing liquid is added into the sizing tank, and when the liquid level of the sizing liquid reaches the upper limit liquid level, the controller controls the concentration adjusting device to stop adding the sizing liquid.

9. The method for controlling the concentration of a sizing system according to claim 6, characterized in that: The method of controlling the concentration adjusting device to introduce the thick glue agent, the sizing liquid or the solvent into the sizing tank according to the preset concentration, the sizing liquid concentration and the sizing liquid level further comprises: When the sizing solution concentration is higher than the preset concentration, determining the actual solute mass in the sizing tank according to the sizing solution volume and the sizing solution concentration in the sizing tank; Determining the target volume of the sizing solution after adding the solvent according to the actual solute mass and the preset concentration; The volume of the solvent to be introduced into the sizing tank is determined according to the difference between the target volume and the volume of the sizing liquid.

10. The method for controlling the concentration of a sizing system according to claim 6, characterized in that: The method of controlling the concentration adjusting device to introduce the thick glue agent, the sizing liquid or the solvent into the sizing tank according to the preset concentration, the sizing liquid concentration and the sizing liquid level further comprises: When the difference between the sizing liquid concentration and the preset concentration is within a first interval, it is determined whether to introduce sizing liquid into the sizing tank according to the level of the sizing liquid in the sizing tank.

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