Auxiliary system for online rapid detection of solid content of impregnating compound and detection method

Abstract

The invention provides an auxiliary system for online rapid detection of the solid content of an impregnating compound and a detection method. According to the method, an auxiliary system with a specific structure and a specific connection relation is adopted to carry out online rapid detection on the solid content of the impregnating compound, so that relatively good overall interaction is realized: after the impregnating compounds with different solid contents are detected by an online near-infrared device, the impregnating compounds are converted into different wavelength signal values through a signal processor; establishing an online calibration model of the solid content of the impregnating compound with the solid content sampled and detected by a drying oven method, and then online and quickly detecting the solid content in the impregnating compound and the fluctuation condition of the solid content through the calibration model. Through online detection and monitoring of the solid content of the impregnating compound, the conditions of stability, solid content fluctuation and the like of the impregnating compound can be tracked in real time, timely early warning and intervention are facilitated, and the risk of overall fluctuation or batch disqualification of the oil content is avoided; meanwhile, the online detection speed is high, manual sampling, oven drying, weighing, calculation and other operations can be reduced, the detection efficiency is improved, and rapid production guidance is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of sizing agent preparation, detection and use in glass fiber production, and more specifically, relates to an auxiliary system and detection method for online rapid detection of the solid content of sizing agent. Background Art

[0002] During the production process of glass fiber, sizing agent is needed for impregnation, and only qualified and stable sizing agent can ensure the use performance of glass fiber and subsequent processing. At present, in the glass fiber industry, the solid content of sizing agent is mainly detected by the method of manual sampling, oven drying and weighing. From operations such as manual sampling, weighing, oven drying, re-weighing, and calculation, the detection time generally takes 1.5 - 2 hours. When the solid content fluctuates or is unqualified, at least another 2 hours are required for re-configuration and detection. The detection cycle is long. For production lines with complex product structures, the solid content of more than 10 sizing agents needs to be detected every day. The operation labor intensity is high, a large amount of manpower is spent, the work efficiency is low, and at the same time, there are disadvantages such as time lag, data lag, and poor timeliness. In addition, during the production, configuration and use of sizing agent, changes in factors such as the particle size and viscosity of sizing agent raw materials, the configuration process, the stability of sizing agent formula, sizing agent precipitation, wire drawing process, sizing agent temperature, and environmental temperature will all cause fluctuations in the solid content of sizing agent. When the solid content fluctuation exceeds a certain range, it will cause the overall deviation of oil content or batch unqualified. However, during the actual use process, the solid content is not detected and monitored online in real time, which is not conducive to product quality control.

[0003] At present, the prior art discloses an online detection system and detection method for the solid content of sizing agent (application number: CN201910028340.8), which calculates the solid content of sizing agent by using the detection principle of compressed air blowing, weighing with a balance, and microwave heating; however, it is still difficult to solve the technical problems of manual sampling for detection, long detection cycle, and the influence of sizing agent bubbles, precipitation, impurities, liquid level changes, environmental light, etc. during the production and use of sizing agent on the online near-infrared equipment detection. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an auxiliary system and detection method for online rapid detection of the solid content of sizing agent. Through online detection and monitoring of the solid content of sizing agent, the stability, solid content fluctuation, etc. of sizing agent can be tracked in real time, which is convenient for timely warning and intervention, and avoids the risk of overall fluctuation or batch unqualified of oil content; at the same time, the online detection speed is fast, which can reduce operations such as manual sampling, oven drying, weighing, and calculation, improve the detection efficiency, and is conducive to quickly guiding production.

[0005] The present invention provides an auxiliary system for online rapid detection of the solid content of sizing agent, including:

[0006] Sizing agent delivery device; one end of its first hose is connected to the inlet of the pump, and the other end is inserted into the middle of the sizing agent tank; the outlet of the pump and the inlet of the sizing agent return box are connected by a second hose;

[0007] Sizing agent return box device; it is placed downstream of the sizing agent delivery device, including a return box, a return box inlet, a return box outlet, a filter screen tank, a filter screen, a baffle, and a return box cover; the return box inlet is connected to the outlet of the pump; the filter screen tank is placed behind the return box inlet and fixes the filter screen; the baffle is placed in front of the return box outlet; one end of the third hose is connected to the return box outlet, and the other end of the third hose is inserted into the middle of the sizing agent tank; the return box cover is placed directly above the return box;

[0008] On-line near-infrared detection device for sizing agent solid content; it is placed directly above the return box cover and the return box and is fixed by the return box cover.

[0009] Preferably, barbs are provided at the return box inlet and the return box outlet respectively.

[0010] Preferably, the filter screen is a double-layer filter screen.

[0011] The present invention also provides a detection method for on-line rapid detection of sizing agent solid content, including the following steps:

[0012] a) Adopt the auxiliary system for on-line rapid detection of sizing agent solid content described in the above technical solution, turn on the switch of the pump, suck the sizing agent in the sizing agent tank through the pump via the first hose, and sequentially transport it to the return box through the second hose and the return box inlet, and then pass through the filter screen, baffle, return box outlet, and third hose in sequence, and circulate and return to the sizing agent tank;

[0013] b) Turn on the switch of the on-line near-infrared detection device, read the wavelength signal values feedback by the on-line near-infrared detection device 3 to 5 times every 20s to 40s, and take the average value A1. At the same time, sample and detect the solid content B1 according to the method of detecting the solid content in the oven;

[0014] c) Add water to the sizing agent tank for dilution and stir evenly. The whole process circulates for 1min to 5min, and then read the wavelength signal values feedback by the on-line near-infrared detection device 3 to 5 times every 20s to 40s, and take the average value A2. At the same time, sample and detect the solid content B2 according to the method of detecting the solid content in the oven;

[0015] d) Repeat the above step c), dilute with different amounts of water 3 times and stir evenly, each cycle for 1 min to 5 min, read the wavelength signal values feedback by the on-line near-infrared detection device 3 to 5 times every 20 s to 40 s, and take the average values A3, A4, and A5 respectively. At the same time, sample and detect the solid content B3, B4, and B5 according to the method of detecting the solid content by the oven;

[0016] e) Use the wavelength signal values A1, A2, A3, A4, and A5 feedback by the on-line near-infrared detection in the above steps b) to d), and the solid content B1, B2, B3, B4, and B5 detected by the oven method to establish a calibration model for the solid content of this sizing agent;

[0017] f) Turn off the switches of the pump and the on-line near-infrared detection device, remove the on-line near-infrared detection device from the reflux box cover, then remove the first hose and the third hose. Place the first hose in a container filled with water and the third hose in the waste liquid tank. Turn on the switch of the pump and wash all the hoses and the sizing agent in the reflux box with water circulation until the water discharged from the hose is clear. Finally, empty the water in the hose and the reflux box, turn off the switch of the pump, and wait for the next detection;

[0018] g) After establishing the calibration model according to the above steps a) to e), perform on-line rapid detection on the sizing agent to be tested. Fix the near-infrared detection device again directly above the reflux box cover and the reflux box, and insert the first hose and the third hose into the middle of the sizing agent tank filled with the sizing agent to be tested respectively;

[0019] h) Turn on the switch of the pump, suck out the sizing agent to be tested in the sizing agent tank through the pump via the first hose, and transport it to the reflux box through the second hose and the reflux box inlet in sequence, and then pass through the filter screen, baffle, reflux box outlet, and the third hose in sequence, and circulate and reflux to the sizing agent tank for 1 min to 5 min;

[0020] i) Turn on the switch of the on-line near-infrared detection device, read the wavelength signal values A6 to An values feedback by the on-line near-infrared detection device every 20 s to 40 s, and calculate the solid content B6 to Bn values of the sizing agent to be tested according to the on-line calibration model;

[0021] j) Repeat the above steps a) to i) to perform on-line rapid detection of the solid content of other sizing agents.

[0022] Preferably, in step b), read the wavelength signal values feedback by the on-line near-infrared detection device 3 to 5 times every 30 s.

[0023] Preferably, in step c), the whole process is cycled for 2 min to 3 min, and then read the wavelength signal values feedback by the on-line near-infrared detection device 3 to 5 times every 30 s.

[0024] Preferably, in step d), each cycle lasts for 2 min to 3 min, and the wavelength signal values feedback by the on-line near-infrared detection device are read 3 to 5 times every 30 s.

[0025] Preferably, in step g), the solid content of the sizing agent to be measured is between B1 and B5.

[0026] Preferably, in step h), the time of the cycle is 2 min to 3 min.

[0027] Preferably, in step i), the wavelength signal values A6 to An feedback by the on-line near-infrared detection device are read every 30 s.

[0028] The present invention provides an auxiliary system and a detection method for on-line rapid detection of the solid content of sizing agent; the auxiliary system includes: a sizing agent conveying device; one end of its first hose is connected to the inlet of the pump, and the other end is inserted into the middle of the sizing agent tank; the outlet of the pump and the inlet of the sizing agent return box are connected by a second hose; a sizing agent return box device; which is placed downstream of the sizing agent conveying device, and includes a return box, a return box inlet, a return box outlet, a filter screen tank, a filter screen, a baffle, and a return box cover; the return box inlet is communicated with the outlet of the pump; the filter screen tank is placed behind the return box inlet and fixes the filter screen; the baffle is placed in front of the return box outlet; one end of the third hose is connected to the return box outlet, and the other end of the third hose is inserted into the middle of the sizing agent tank; the return box cover is placed directly above the return box; an on-line near-infrared detection device for the solid content of sizing agent; which is placed directly above the return box cover and the return box and is fixed by the return box cover. Compared with the prior art, the present invention uses an auxiliary system with a specific structure and connection relationship to perform on-line rapid detection of the solid content of sizing agent, achieving a good overall interaction: after the on-line near-infrared device detects sizing agents with different solid contents, they are converted into different wavelength signal values through a signal processor, and an on-line calibration model of the solid content of this sizing agent is established with the solid content detected by sampling using the oven method, and then the solid content and its fluctuation in this sizing agent are detected on-line and rapidly through the calibration model; through on-line detection and monitoring of the solid content of this sizing agent, the stability of the sizing agent, the fluctuation of the solid content, etc. can be tracked in real time, which is convenient for timely warning and intervention, and avoids the risk of overall fluctuation or batch unqualified of the oil content; at the same time, the on-line detection speed is fast, which can reduce operations such as manual sampling, oven drying, weighing, and calculation, improve the detection efficiency, and is conducive to quickly guiding production. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the auxiliary system for on-line rapid detection of the solid content of sizing agent provided by the present invention;

[0030] Figure 2Schematic diagram of the structure of the reflux box part in the auxiliary system for on-line rapid detection of the solid content of the sizing agent provided by the present invention;

[0031] Figure 3 Schematic diagram of the structure of the barbs at the inlet and outlet of the reflux box in the auxiliary system for on-line rapid detection of the solid content of the sizing agent provided by the present invention;

[0032] Figure 4 Schematic diagram of the structure of the double-layer filter screen in the auxiliary system for on-line rapid detection of the solid content of the sizing agent provided by the present invention;

[0033] Figure 5 Schematic diagram of the structure of the reflux box cover in the auxiliary system for on-line rapid detection of the solid content of the sizing agent provided by the present invention;

[0034] Figure 6 Schematic diagram of the structure of the near-infrared detection device in the auxiliary system for on-line rapid detection of the solid content of the sizing agent provided by the present invention;

[0035] Figure 7 Sizing agent A in Example 1 of the present invention 1 Solid content detection model;

[0036] Figure 8 Sizing agent A in Example 1 of the present invention 1 On-line detection of solid content;

[0037] Figure 9 Sizing agent C in Example 2 of the present invention 1 Solid content detection model;

[0038] Figure 10 Sizing agent C in Example 2 of the present invention 1 Comparison between on-line solid content detection and oven method detection;

[0039] Figure 11 Sizing agent D in Example 3 of the present invention 1 Solid content detection model;

[0040] Figure 12 Sizing agent D in Example 3 of the present invention 1 Comparison between on-line solid content detection and oven method detection;

[0041] Figure 13 Schematic diagram of the calibration model of the solid content of the sizing agent established by the present invention;

[0042] Figure 14 Schematic diagram for continuous on-line detection of solid content by the present invention. Detailed implementation manners

[0043] Next, in combination with the embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0044] In view of the pain points that the manual sampling for the sizing solid content detection has a long detection period by the oven method, and the sizing bubbles, precipitation, impurities, liquid level changes, environmental light, etc. occurring during the production and use of the sizing affect the detection of the on-line near-infrared device, the present invention provides an auxiliary system and a detection method for rapid on-line detection of the sizing solid content.

[0045] On the one hand, the present invention provides an auxiliary system for rapid on-line detection of the sizing solid content, including:

[0046] A sizing conveying device; one end of its first hose is connected to the inlet of the pump, and the other end is inserted into the middle of the sizing tank; the outlet of the pump and the inlet of the sizing return box are connected by a second hose;

[0047] A sizing return box device; it is placed downstream of the sizing conveying device, including a return box, a return box inlet, a return box outlet, a filter screen slot, a filter screen, a baffle, and a return box cover; the return box inlet is communicated with the outlet of the pump; the filter screen slot is placed behind the return box inlet and fixes the filter screen; the baffle is placed in front of the return box outlet; one end of the third hose is connected to the return box outlet, and the other end of the third hose is inserted into the middle of the sizing tank; the return box cover is placed directly above the return box;

[0048] An on-line near-infrared detection device for sizing solid content; it is placed directly above the return box cover and the return box and is fixed by the return box cover.

[0049] Please refer to Figures 1 - 6 , in which, 1 is the return box; 2 is the return box inlet; 3 is the return box outlet; 4 is the return box filter screen slot; 5 is the return box baffle; 6 is the barbs at the return box inlet 2 and outlet 3; 7 is the double-layer filter screen; 8 is the return box cover; 9 is the near-infrared detection device; 10 is the sizing tank; 11 is the pump; 12 is the hose connecting the pump (the first hose); 13 is the hose connecting the pump outlet and the return box inlet (the second hose); 14 is the hose connecting the return box outlet (the third hose).

[0050] In the present invention, the auxiliary system includes: a sizing agent conveying device for conveying the sizing agent in the sizing agent tank to the sizing agent reflux box through a pump; a sizing agent reflux box device disposed downstream of the sizing agent conveying device for connecting the sizing agent conveying device, filtering air bubbles, precipitates or impurities in the sizing agent, stabilizing the sizing agent liquid level, fixing an on-line near-infrared detection device for the sizing agent solid content, preventing ambient light from entering the reflux box, and a device for circulating and refluxing the sizing agent in the reflux box to the sizing agent tank; an on-line near-infrared detection device for the sizing agent solid content, which emits spectra of different wavelengths from the near-infrared detection device onto the sizing agent in the reflux box, and after continuous absorption and reflection of the spectra, is converted into different wavelength signal values through a signal processor.

[0051] In the present invention, one end of the first hose of the sizing agent conveying device is connected to the inlet of the pump, and the other end is inserted into the middle of the sizing agent tank filled with sizing agent. The outlet end of the pump and the inlet of the sizing agent reflux box are connected by a second hose for conveying the sizing agent in the sizing agent tank to the sizing agent reflux box through the pump.

[0052] In the present invention, the sizing agent reflux box device is disposed downstream of the sizing agent conveying device and includes a reflux box, a reflux box inlet and outlet and their barbs, a filter mesh groove, a filter mesh, a baffle, and a reflux box cover; wherein, the sizing agent reflux box inlet is connected to the outlet end of the pump by a hose for connecting the outlet hose of the pump and guiding the sizing agent in the hose into the reflux box; the filter mesh groove behind the reflux box inlet is for fixing the filter mesh and filtering air bubbles, precipitates or impurities in the sizing agent; the baffle in front of the sizing agent reflux box outlet is for the sizing agent to flow out above the baffle and stabilizing the sizing agent liquid level; one end of the hose connected to the sizing agent reflux box outlet is inserted into the sizing agent tank to be measured for circulating and refluxing the sizing agent in the reflux box to the sizing agent tank; the reflux box cover is placed directly above the reflux box for fixing the on-line near-infrared detection device, preventing the detection probe from contacting the sizing agent, and ambient light from entering the detection area of the reflux box.

[0053] In the present invention, barbs are respectively provided at the reflux box inlet and the reflux box outlet, which can firmly connect with the hose; the filter mesh is preferably a double-layer filter mesh, which is more beneficial for filtering air bubbles, precipitates or impurities in the sizing agent. The baffle is disposed in front of the reflux box outlet, which can prevent large fluctuations in the liquid level inside the reflux box and have an adverse impact on near-infrared detection.

[0054] In the present invention, the on-line near-infrared detection device for the sizing agent solid content is placed directly above the reflux box cover and the reflux box, and is used for the on-line near-infrared detection device to emit spectra of different wavelengths onto the sizing agent in the reflux box, and after continuous absorption and reflection of the spectra, is converted into different wavelength signal values through a signal processor.

[0055] On the other hand, the present invention also provides a detection method for on-line rapid detection of the solid content of the sizing agent, comprising the following steps:

[0056] a) Using the auxiliary system for on-line rapid detection of the solid content of the sizing agent described in the above technical solution, turn on the switch of the pump, suck out the sizing agent in the sizing agent tank through the pump via the first hose, and successively transport it to the reflux box through the second hose and the reflux box inlet, and then successively pass through the filter screen, the baffle, the reflux box outlet, and the third hose, and circulate and reflux to the sizing agent tank;

[0057] b) Turn on the switch of the on-line near-infrared detection device, read the wavelength signal values feedback by the on-line near-infrared detection device 3 to 5 times every 20 s to 40 s, and take the average value A1. At the same time, sample and detect the solid content B1 according to the method of detecting the solid content by the oven;

[0058] c) Add water to the sizing agent tank for dilution and stir evenly. The whole process is circulated for 1 min to 5 min, and then read the wavelength signal values feedback by the on-line near-infrared detection device 3 to 5 times every 20 s to 40 s, and take the average value A2. At the same time, sample and detect the solid content B2 according to the method of detecting the solid content by the oven;

[0059] d) Repeat the above step c), dilute with different amounts of water 3 times and stir evenly. Each time, circulate for 1 min to 5 min, read the wavelength signal values feedback by the on-line near-infrared detection device 3 to 5 times every 20 s to 40 s, and respectively take the average values A3, A4, and A5. At the same time, sample and detect the solid contents B3, B4, and B5 according to the method of detecting the solid content by the oven;

[0060] e) Use the wavelength signal values A1, A2, A3, A4, and A5 feedback by the on-line near-infrared detection in the above steps b) to d), and the solid contents B1, B2, B3, B4, and B5 detected by the oven method, and establish a calibration model for the solid content of the sizing agent using a scatter plot;

[0061] f) Turn off the switches of the pump and the on-line near-infrared detection device, take out the on-line near-infrared detection device from the reflux box cover, then take out the first hose and the third hose. The first hose is placed in a container filled with water, and the third hose is placed in a waste liquid tank. Turn on the switch of the pump, and wash all the hoses and the sizing agent in the reflux box with water circulation until the water discharged from the hose is clear. Finally, drain the water in the hose and the reflux box, turn off the switch of the pump, and wait for the next detection;

[0062] g) After establishing the calibration model according to the above steps a) to e), perform on-line rapid detection on the sizing agent to be measured. Fix the near-infrared detection device directly above the reflux box cover and the reflux box again, and insert the first hose and the third hose into the middle of the sizing agent tank filled with the sizing agent to be measured respectively;

[0063] h) Turn on the pump switch, suck out the sizing agent to be tested in the sizing agent tank through the pump via the first hose, and transport it to the reflux box through the second hose and the reflux box inlet in sequence, then pass through the filter screen, baffle, reflux box outlet, and third hose in sequence, and circulate back to the sizing agent tank for 1 min to 5 min;

[0064] i) Turn on the switch of the on-line near-infrared detection device, read the wavelength signal values A6 to An fed back by the on-line near-infrared detection device every 20 s to 40 s, and calculate the solid content values B6 to Bn of the sizing agent to be tested according to the on-line calibration model;

[0065] j) Repeat the above steps a) to i) to quickly detect the solid content of other sizing agents on-line.

[0066] The detection method for on-line rapid detection of the solid content of the sizing agent provided by the present invention adopts the auxiliary system for on-line rapid detection of the solid content of the sizing agent described in the above technical solution, and preferably includes the following steps:

[0067] Step 1: Turn on the pump switch, the pump sucks the sizing agent from the sizing agent tank and transports it to the reflux box through the hose and the reflux box inlet, passes through the double-layer filter screen, baffle, reflux box outlet, and hose, and then circulates back to the sizing agent tank.

[0068] Step 2: Turn on the switch of the on-line near-infrared detection device, read the wavelength signal values fed back by the on-line near-infrared detection device 3 to 5 times every 30 s, and take the average value A1. At the same time, sample and detect the solid content B1 according to the method of detecting the solid content in the oven.

[0069] Step 3: Add a certain amount of pure water to the sizing agent tank for dilution and stir evenly. The whole process circulates for 2 min to 3 min, then read the wavelength signal values fed back by the on-line near-infrared detection device 3 to 5 times every 30 s, and take the average value A2. At the same time, sample and detect the solid content B2 according to the method of detecting the solid content in the oven.

[0070] Step 4: Repeat the above Step 3, add pure water with different weights for dilution 3 times and stir evenly. Each time it circulates for 2 min to 3 min, read the wavelength signal values fed back by the on-line near-infrared detection device 3 to 5 times every 30 s, and take the average values A3, A4, and A5 respectively. At the same time, sample and detect the solid contents B3, B4, and B5 according to the method of detecting the solid content in the oven.

[0071] Step 5: Use the wavelength signal values A1, A2, A3, A4, and A5 fed back by the on-line detection of near-infrared in Steps 2 to 4, and the solid contents B1, B2, B3, B4, and B5 detected by the oven method, and establish a calibration model for the solid content of this sizing agent using a scatter plot, as shown in Figure 13 shown.

[0072] Step 6: Turn off the switches of the pump and the on-line near-infrared detection device. Remove the on-line near-infrared detection device from the reflux box cover, and then take out the two hoses in the sizing agent tank. The hose connected to the pump is placed in a container filled with clean water, and the hose connected to the outlet of the reflux box is placed in the waste liquid tank. Turn on the switch of the pump, and continuously circulate with clean water to wash all the hoses and the sizing agent in the reflux box until the water discharged from the hoses is clear. Finally, drain the clean water in the hoses and the reflux box, turn off the switch of the pump, and wait for the next detection.

[0073] Step 7: After establishing the calibration model according to the above steps 1 to 5, perform on-line rapid detection on the sizing agent. The solid content of the sizing agent to be measured is between B1 and B5. Fix the near-infrared detection device again directly above the reflux box cover and the reflux box, and insert the hose connected to the pump inlet and the hose connected to the reflux box outlet into the middle of the sizing agent tank to be measured respectively.

[0074] Step 8: Turn on the switch of the pump. The pump transports the sizing agent in the sizing agent tank to be measured into the reflux box through the reflux box inlet, passes through the double-layer filter screen, baffle, reflux box outlet, and hose, and then circulates back to the sizing agent tank to be measured for 2 min to 3 min.

[0075] Step 9: Turn on the switch of the on-line near-infrared detection device. Read the wavelength signal values A6 to An values fed back by the on-line near-infrared detection device every 30 s, and calculate the solid content B6 to Bn values of the sizing agent to be measured according to the on-line calibration model. See Figure 14 as shown.

[0076] Step 10: Repeat the above steps 1 to 9 to rapidly detect the solid content of other sizing agents on-line.

[0077] The present invention adopts an auxiliary system with a specific structure and connection relationship to perform on-line rapid detection of the solid content of the sizing agent, achieving a good overall interaction: after the on-line near-infrared device detects sizing agents with different solid contents, they are converted into different wavelength signal values through a signal processor, and an on-line calibration model of the solid content of the sizing agent is established with the solid content detected by sampling using the oven method. Then, the solid content and its fluctuation in the sizing agent are detected on-line and rapidly through the calibration model; through on-line detection and monitoring of the solid content of the sizing agent, the stability of the sizing agent, the fluctuation of the solid content, etc. can be tracked in real time, which is convenient for timely early warning and intervention, and avoids the risk of overall fluctuation or batch unqualified of the oil content; at the same time, the on-line detection speed is fast, which can reduce operations such as manual sampling, oven drying, weighing, and calculation, improve the detection efficiency, and is conducive to rapidly guiding production.

[0078] The present invention provides an auxiliary system and a detection method for on-line rapid detection of the solid content of a sizing agent; the auxiliary system includes: a sizing agent conveying device; one end of a first hose thereof is connected to the inlet of a pump, and the other end is inserted into the middle of a sizing agent tank; the outlet of the pump and the inlet of a sizing agent return box are communicated by a second hose; a sizing agent return box device; which is placed downstream of the sizing agent conveying device and includes a return box, a return box inlet, a return box outlet, a filter screen tank, a filter screen, a baffle plate, and a return box cover; the return box inlet is communicated with the outlet of the pump; the filter screen tank is placed behind the return box inlet and fixes the filter screen; the baffle plate is placed in front of the return box outlet; one end of a third hose is connected to the return box outlet, and the other end of the third hose is inserted into the middle of the sizing agent tank; the return box cover is placed directly above the return box; an on-line near-infrared detection device for the solid content of the sizing agent; which is placed directly above the return box cover and the return box and is fixed by the return box cover. Compared with the prior art, the present invention adopts an auxiliary system with a specific structure and connection relationship to perform on-line rapid detection of the solid content of the sizing agent, achieving a better overall interaction: after the on-line near-infrared device detects sizing agents with different solid contents, they are converted into different wavelength signal values through a signal processor, and an on-line calibration model of the solid content of this sizing agent is established with the solid content detected by sampling using the oven method, and then the solid content and its fluctuation in this sizing agent are detected on-line and rapidly through the calibration model; through on-line detection and monitoring of the solid content of this sizing agent, the stability of the sizing agent, the fluctuation of the solid content, etc. can be tracked in real time, facilitating timely warning and intervention, and avoiding the risk of overall fluctuation or batch unqualified of the oil content; at the same time, the on-line detection speed is fast, which can reduce operations such as manual sampling, oven drying, weighing, and calculation, improve the detection efficiency, and is conducive to quickly guiding production.

[0079] To further illustrate the present invention, the following detailed description is provided through the following embodiments.

[0080] Embodiment 1

[0081] See Figures 1 - 6 As shown, the auxiliary system for on-line rapid detection of the solid content of the sizing agent provided by the present invention includes:

[0082] A sizing agent conveying device, one end of a hose 12 is connected to the inlet of a pump 11, the other end of the hose 12 is inserted into the middle of a sizing agent tank 10 of the sizing agent to be measured, and the outlet of the pump 11 and the inlet 2 of a sizing agent return box 1 are communicated by a hose 13, for conveying the sizing agent in the sizing agent tank 10 into the sizing agent return box 1 through the pump 11, the hose 12 and the hose 13;

[0083] The sizing agent reflux box device is placed downstream of the sizing agent conveying device. The sizing agent reflux box device includes a reflux box 1, a reflux box inlet 2, an outlet 3 and its barbs 6, a filter mesh tank 4, a double-layer filter mesh 7, a baffle 5, and a reflux box cover 8. Among them, the sizing agent reflux box inlet 2 is connected to the outlet of the pump 11 by a hose 13. The filter mesh tank 4 behind it is used to fix the double-layer filter mesh 7 and filter air bubbles, sediments or impurities in the sizing agent; the baffle 5 in front of the sizing agent reflux box outlet 3 is used for the sizing agent to flow out from above the baffle 5 and stabilize the sizing agent liquid level; the sizing agent reflux box outlet 3 is connected to one end of a hose 14, and the other end of the hose 14 is inserted into the sizing agent tank 10 to be measured, and is used to circulate and reflux the sizing agent in the reflux box 1 into the sizing agent tank 10; the reflux box cover 8 is placed directly above the reflux box 1 and is used to fix the on-line near-infrared detection device 9 to prevent the detection probe from contacting the sizing agent and ambient light from entering the detection area of the reflux box 1;

[0084] The on-line near-infrared detection device for the solid content of the sizing agent is placed directly above the reflux box cover 8 and the reflux box 1, and is used for the on-line near-infrared detection device 9 to emit spectra of different wavelengths to irradiate the sizing agent in the reflux box 1, and after continuous absorption and reflection of the spectra, it is converted into different wavelength signal values by a signal processor.

[0085] The present invention adopts the above-mentioned auxiliary system for on-line rapid detection of the solid content of the sizing agent, and the detection method for on-line rapid detection of the solid content of the sizing agent includes the following steps:

[0086] Step 1: Turn on the switch of the pump 11. The pump 11 sucks the sizing agent A with a high solid content from the sizing agent tank 10 through the hose 12 1 , and then transports it into the reflux box 1 through the hose 13 and the reflux box inlet 2, passes through the double-layer filter mesh 7, the baffle 5, the reflux box outlet 3, and the hose 14, and then circulates and refluxes into the sizing agent tank 10;

[0087] Step 2: Turn on the switch of the on-line near-infrared detection device 9. Read the wavelength signal values feedback by the on-line near-infrared detection device 9 5 times every 30 s, and take the average value A1, as shown in Table 1. At the same time, calculate the solid content B1 according to the method of detecting the solid content by the oven, as shown in Table 2;

[0088] Step 3: Add a certain amount of pure water to the sizing agent tank 10 for dilution and stir evenly. The whole process is circulated for 2 min, and then read the wavelength signal values feedback by the on-line near-infrared detection device 9 5 times every 30 s, and take the average value A2. At the same time, calculate the solid content B2 according to the method of detecting the solid content by the oven, as shown in Table 2;

[0089] Step 4: Repeat the above Step 3, add pure water with different weights 3 times for dilution and stir evenly. Each cycle lasts for 2 minutes. Read the wavelength signal values feedback by the on-line near-infrared detection device 9 five times every 30 seconds, and take the average values A3, A4, and A5 respectively, as shown in Table 1. At the same time, calculate the solid contents B3, B4, and B5 according to the method of detecting the solid content by the oven, as shown in Table 2;

[0090] Table 1 Sizing Agent A 1 Near-infrared spectrum values before and after adding pure water

[0091]

[0092]

[0093] Table 2 Sizing Agent A 1 Solid content detection before and after adding pure water

[0094]

[0095] Note: For the method of detecting the solid content by the oven method, prepare the sizing agent A to be tested 1 , weigh the weight M0 of the empty tin foil with an electronic balance, and use a pipette to take 3 - 5 g of sizing agent A 1 Add it to the tin foil, read the weight M1, and calculate the emulsion weight M2 = M1 - M0. Place the tin foil containing the sizing agent in the oven and dry it for 1.5 - 2 hours, then cool it at room temperature for 1 - 2 minutes, and then weigh M3. For sizing agent A 1 The weight M4 after drying = M3 - M0, and then calculate the solid content B0 of the sizing agent, B0 = M4 / M2 × 100% = (M3 - M0) / (M1 - M0) × 100%. Take 2 - 3 samples and finally calculate the average value of the solid content of sizing agent A 1 The average value. Comparing the detection method of the on-line rapid detection of the solid content of the sizing agent provided by the present invention with the detection of the solid content by the oven method, the detection time is shorter, the detection efficiency of the solid content is improved, and it is beneficial to quickly guide production.

[0096] Step 5: Utilize the wavelength signal values A1, A2, A3, A4, and A5 feedback by the on-line detection near-infrared in Steps 2 - 4, and the solid contents B1, B2, B3, B4, and B5 detected by the oven method, and use a scatter plot to establish the calibration model of the solid content of this sizing agent A 1 such as Figure 7 ;

[0097] Step 6: Turn off the switches of pump 11 and the on-line near-infrared detection device 9. Remove the on-line near-infrared detection device 9 from the reflux box cover 8, and then remove hoses 12 and 14 from the sizing agent tank 10. Among them, the hose 12 connected to the pump 11 is placed in a container filled with clean water, and the hose 14 connected to the reflux box outlet 3 is placed in the waste liquid tank. Turn on the switch of pump 11, and continuously circulate with clean water to wash all hoses 12, 13, 14 and the sizing agent in the reflux box 1 until the water discharged from the hose 14 is clear. Finally, empty the clean water in hoses 12, 13, 14 and the reflux box 1, turn off the switch of pump 11, and wait for the next detection use;

[0098] Step 7: After establishing the calibration model according to the above steps 1-5, perform on-line rapid detection on the sizing agent A in normal use 1 The solid content of the sizing agent A to be measured 1 is between B1 and B5. Fix the on-line near-infrared detection device 9 directly above the reflux box cover 8 and the reflux box 1 again, and insert the hose 12 connected to the inlet of the pump 11 and the hose 14 connected to the reflux box outlet 3 into the middle of the sizing agent tank 10 to be measured respectively;

[0099] Step 8: Turn on the switch of pump 11 again. The pump 11 sucks the sizing agent A in normal use from the sizing agent tank 10 to be measured through the hose 12 1 , and then transports it to the reflux box 1 through the hose 13 and the reflux box inlet 2, passes through the double-layer filter screen 7, the baffle 5, the reflux box outlet 3, the hose 14, and then circulates back to the sizing agent tank 10 for 2 minutes;

[0100] Step 9: Turn on the switch of the on-line near-infrared detection device 9. Read the wavelength signal values A6-An values fed back by the on-line near-infrared detection device 9 every 30 seconds, and calculate the solid content B6-Bn values of the sizing agent to be measured according to the on-line calibration model accordingly. For example Figure 8 . The detection method for on-line rapid detection of the solid content of the sizing agent provided by the present invention can avoid the errors caused by manual sampling and operation compared with the oven method for detecting the solid content. At the same time, it realizes real-time on-line detection and monitoring of the solid content of the sizing agent, tracks the stability of the sizing agent, the fluctuations of the solid content, etc., facilitates timely early warning and intervention, and avoids the risk of batch unqualified oil content.

[0101] Step 10: Repeat the above steps 1-9 to rapidly detect the solid content of other sizing agents on-line.

[0102] Example 2

[0103] According to the above method, use the near-infrared device to track the near-infrared spectrum values of the sizing agent C with high solid content 1 before and after adding pure water as shown in Table 3, and at the same time use the oven method to detect the solid content as shown in Table 4. Finally, establish the on-line detection model of the sizing agent C 1 as shown inFigure 9 , and then compare the online tracking with the oven method detection Figure 10 , the experimental data are as follows.

[0104] Table 3 Wetting Agent C 1 Near infrared spectrum values before and after adding pure water

[0105] Serial number Spectrum value C1 Spectrum value C2 Spectrum value C3 Spectrum value C4 Spectrum value C5 1 4519 4448 4408 4354 4274 2 4522 4455 4404 4358 4273 3 4518 4450 4409 4359 4279 4 4520 4453 4408 4357 4274 5 4519 4454 4405 4360 4272 Mean value 4520 4452 4407 4358 4274

[0106] Table 4 Wetting Agent C 1 Solid content detection before and after adding pure water

[0107]

[0108] Example 3

[0109] Following the above method, the near infrared device was used to track the high solid content of the sizing agent D 1 The near infrared spectrum values before and after adding pure water are shown in Table 5. At the same time, the solid content was detected by the oven method as shown in Table 6. Finally, the wetting agent D was established. 1 Online detection model such as Figure 11 , and then compare the online tracking with the oven method detection Figure 12 , the experimental data are as follows.

[0110] Table 5 Wetting agent D 1 Near infrared spectrum values before and after adding pure water

[0111] Serial number Spectrum value D1 Spectrum value D2 Spectrum value D3 Spectrum value D4 Spectrum value D5 1 12823 12716 12597 12468 12304 2 12818 12720 12603 12468 12294 3 12825 12716 12593 12460 12284 4 12824 12715 12591 12469 12284 5 12823 12716 12595 12462 12285 Mean value 12823 12717 12596 12465 12290

[0112] Table 6 Wetting agent D 1 Solid content detection before and after adding pure water

[0113]

[0114]

[0115] In summary, the present invention provides an auxiliary system and a detection method for online rapid detection of solid content of a wetting agent. Compared with the prior art, the structural design and detection principle thereof are different. The present invention has obvious technical innovation and specifically achieves the following beneficial effects:

[0116] (1) The online near-infrared detection equipment and the infiltrant to be tested adopt a non-contact method to avoid contamination of the detection probe by the infiltrant conjunctiva. Therefore, the near-infrared detection probe does not need to be removed for cleaning;

[0117] (2) The near-infrared principle is used to quickly detect the solid content in the impregnant. The detection time is controlled at about 30 seconds. It can replace the manual sampling oven method to detect the solid content. The detection efficiency is higher and it is conducive to quickly guiding production.

[0118] (3) By means of on-line detection and monitoring of the solid content, it is possible to track in real time the stability of the sizing agent, fluctuations in the solid content, etc., which is convenient for timely warning and intervention, and avoids the risk of batch unqualified oil content;

[0119] (4) Design a closed reflux box for the detection area of the on-line near-infrared device to prevent ambient light from entering the near-infrared detection area;

[0120] (5) Design a filter mesh groove behind the inlet of the reflux box and insert a double-layer filter mesh to effectively prevent bubbles, precipitates, impurities, etc. on the surface of the sizing agent tank from entering the on-line detection area;

[0121] (6) Design a reflux box baffle in front of the outlet of the reflux box to stabilize the liquid level of the sizing agent detected by the on-line device;

[0122] (7) The reflux box and the reflux box cover are designed separately, which is convenient for observing the stability of the liquid level of the sizing agent in the on-line detection area and for cleaning the reflux box.

[0123] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An auxiliary system for on-line rapid detection of the solid content of a sizing agent, characterized in that Including: Sizing agent conveying device; one end of its first hose is connected to the inlet of the pump, and the other end is inserted into the middle of the sizing agent tank; the outlet of the pump and the inlet of the sizing agent return box are connected by a second hose; Sizing agent return box device; it is placed downstream of the sizing agent conveying device, including a return box, a return box inlet, a return box outlet, a filter mesh tank, a filter mesh, a baffle, and a return box cover; the return box inlet is communicated with the outlet of the pump; the filter mesh tank is placed behind the return box inlet and fixes the filter mesh; the baffle is placed in front of the return box outlet; one end of the third hose is connected to the return box outlet, and the other end of the third hose is inserted into the middle of the sizing agent tank; the return box cover is placed directly above the return box; On-line near-infrared detection device for sizing agent solid content; it is placed directly above the return box cover and the return box and is fixed by the return box cover.

2. The auxiliary system for on-line rapid detection of the sizing solid content according to claim 1, characterized in that, Barbs are respectively provided at the return box inlet and the return box outlet.

3. The auxiliary system for on-line rapid detection of the solid content of the sizing agent according to claim 1, characterized in that The filter mesh is a double-layer filter mesh.

4. A detection method for on-line rapid detection of the solid content of a sizing agent, characterized in that, Including the following steps: a) Adopt the auxiliary system for on-line rapid detection of sizing agent solid content described in any one of claims 1 to 3, turn on the switch of the pump, suck the sizing agent in the sizing agent tank through the pump via the first hose, and sequentially transport it to the return box through the second hose and the return box inlet, and then pass through the filter mesh, the baffle, the return box outlet, and the third hose in sequence, and circulate and return to the sizing agent tank; b) Turn on the switch of the on-line near-infrared detection device, read the wavelength signal values fed back by the on-line near-infrared detection device 3 to 5 times every 20s to 40s, and take the average value A1. At the same time, sample and detect the solid content B1 according to the method of detecting the solid content by the oven; c) Add water to dilute and stir evenly in the sizing agent tank, circulate the whole process for 1min to 5min, then read the wavelength signal values fed back by the on-line near-infrared detection device 3 to 5 times every 20s to 40s, and take the average value A2. At the same time, sample and detect the solid content B2 according to the method of detecting the solid content by the oven; d) Repeat the above step c), add water in different amounts and dilute and stir evenly 3 times, circulate for 1min to 5min each time, read the wavelength signal values fed back by the on-line near-infrared detection device 3 to 5 times every 20s to 40s, and take the average values A3, A4, and A5 respectively. At the same time, sample and detect the solid contents B3, B4, and B5 according to the method of detecting the solid content by the oven; e) Use the wavelength signal values A1, A2, A3, A4, and A5 fed back by on-line detection of near-infrared in the above steps b) to d), and the solid contents B1, B2, B3, B4, and B5 detected by the oven method, and establish a calibration model for the sizing agent solid content using a scatter plot; f) Turn off the switches of the pump and the on-line near-infrared detection device, take out the on-line near-infrared detection device from the return box cover, then take out the first hose and the third hose. The first hose is placed in a container filled with water, and the third hose is placed in a waste liquid tank. Turn on the switch of the pump, and circulate water to clean all the hoses and the sizing agent in the return box until the water discharged from the hose is clear. Finally, drain the water in the hose and the return box, turn off the switch of the pump, and wait for the next detection; g) After establishing the calibration model according to the above steps a) to e), conduct on-line rapid detection of the sizing agent to be measured. Re-fix the near-infrared detection device directly above the reflux box cover and the reflux box, and insert the first hose and the third hose into the middle of the sizing agent tank containing the sizing agent to be measured respectively; h) Turn on the switch of the pump, suck out the sizing agent to be measured in the sizing agent tank through the pump via the first hose, and transport it to the inside of the reflux box through the second hose and the reflux box inlet in sequence, and then pass through the filter screen, baffle, reflux box outlet, and third hose in sequence, and circulate back to the sizing agent tank for 1 min to 5 min; i) Turn on the switch of the on-line near-infrared detection device, read the wavelength signal values A6 to An values fed back by the on-line near-infrared detection device every 20 s to 40 s, and calculate the solid content B6 to Bn values of the sizing agent to be measured according to the on-line calibration model correspondingly; j) Repeat the above steps a) to i) to on-line rapidly detect the solid content of other sizing agents.

5. The detection method according to claim 4, characterized in that, In step b), read the wavelength signal values fed back by the on-line near-infrared detection device 3 to 5 times every 30 s.

6. The detection method according to claim 4, characterized in that, In step c), the whole process circulates for 2 min to 3 min, and then read the wavelength signal values fed back by the on-line near-infrared detection device 3 to 5 times every 30 s.

7. The detection method according to claim 4, characterized in that, In step d), each cycle is 2 min to 3 min, and read the wavelength signal values fed back by the on-line near-infrared detection device 3 to 5 times every 30 s.

8. The detection method according to claim 4, characterized in that, In step g), the solid content of the sizing agent to be measured is between B1 and B5.

9. The detection method according to claim 4, wherein In step h), the cycle time is 2 min to 3 min.

10. The detection method according to claim 4, wherein In step i), read the wavelength signal values A6 to An values fed back by the on-line near-infrared detection device every 30 s.

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