A liquid supply device for online mixing of spinning solution

Abstract

This invention relates to a liquid supply device for online mixing of spinning solution, comprising a storage tank, two delivery pumps, a three-way connector, a length adjustment device, a mixing supply pipeline, a viscosity sensor, a signal processor, and a frequency converter. During the spinning solution delivery process, the viscosity sensor monitors the viscosity of the spinning solution in real time and transmits the viscosity data to the signal processor. The signal processor analyzes and processes the collected viscosity data and then sends adjustment commands to the frequency converter. The frequency converter controls the pumping speed of the two delivery pumps, thereby controlling the content of the polymer solution and the auxiliary agent solution. The signal processor can also control the length adjustment device. Due to the engaging connection between the groove and the protrusion, controlling the rotation of the conveyor belt allows the mixing supply pipeline to be retracted into or released outside the sleeve, thereby changing the length of the mixing supply pipeline actually used for online mixing outside the sleeve, thus controlling the mixing efficiency of the polymer solution and the auxiliary agent solution.

Description

Technical Field

[0001] This invention belongs to the field of textile technology, and in particular relates to a liquid supply device for online mixing of spinning solution. Background Technology

[0002] Inlay spinning is a textile technology that effectively combines nanofibers with traditional short fibers to form yarns with excellent mechanical properties and functionality, thereby increasing the added value of textiles. Inlay spinning adds electrospinning equipment to the fiber carding and web-forming step, embedding micro- and nanofibers into the fiber web under the action of an electric field to prepare a sliver. This sliver is then processed using traditional spinning techniques to produce functional yarns, achieving a cross-scale combination of traditional fibers and micro- and nanofibers.

[0003] The viscosity of the electrospinning solution is a critical process parameter that directly affects the stability of the electrospinning process and the quality of the final micro / nanofibers. The electrospinning solution is composed of a polymer solution and an auxiliary agent solution; the content and mixing efficiency of these solutions determine the viscosity. Currently, the electrospinning solution supply devices in mosaic spinning employ a traditional single-channel design. This means that the polymer and auxiliary agent solutions are mixed in a mixing tank to form the spinning solution before being pumped and piped to the nozzle for spinning. This existing supply device cannot adjust the content and mixing efficiency of the polymer and auxiliary solutions online, failing to meet the applicability requirements of mosaic spinning equipment for spinning complex solution systems. Summary of the Invention

[0004] The main objective of this invention is to provide a liquid supply device for online mixing of spinning solutions, which can effectively solve the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A liquid supply device for online mixing of spinning solution, comprising:

[0007] The liquid storage tank has two liquid storage chambers;

[0008] Two delivery pumps have their inlets connected to the two liquid storage chambers respectively via a first delivery pipe;

[0009] The three-way connector has two inlets that are connected to the outlets of the two delivery pumps via a second delivery pipe.

[0010] A length adjustment device includes a sleeve, a guide tube fixed inside the sleeve, the guide tube communicating with the liquid outlet of the tee connector, and a track device provided on the inner wall of the sleeve. The track device includes a frame body, and a track strip is rotatably mounted on the outside of the frame body. The track strip has several protrusions on its outer side.

[0011] A mixing liquid supply pipe is fitted onto the guide pipe at one end. The mixing liquid supply pipe has a retractable corrugated pipe structure and several grooves on its outer surface. The grooves are engaged with the protrusions of the track strip.

[0012] A viscosity sensor is located at the other end of the mixing supply pipeline;

[0013] The signal processor is electrically connected to the viscosity sensor and the length adjustment device;

[0014] The frequency converter is electrically connected to the signal processor and the two delivery pumps, respectively.

[0015] Preferably, the track device also includes

[0016] A support column is fixed on the inner wall of the sleeve, and a limit groove is formed on the support column;

[0017] The first connecting rod is rotatably connected at both ends to the main frame body and the support column, respectively.

[0018] The limiting element is slidably inserted into the limiting groove;

[0019] The second connecting rod is rotatably connected at both ends to the frame body and the limiting member, respectively.

[0020] A telescopic cylinder is fixed below the limiting member, and its output shaft is fixedly connected to the limiting member.

[0021] Preferably, there are at least three track devices, which are evenly arranged on the inner wall of the sleeve.

[0022] Preferably, the liquid storage chamber is a box structure, with a partition fixed in the middle to form two liquid storage chambers.

[0023] Preferably, the end of the first delivery pipe that connects to the liquid storage chamber is in the shape of a funnel.

[0024] Preferably, both the inlet and outlet of the tee connector adopt a grooved connection structure.

[0025] This invention provides a liquid supply device for online mixing of spinning solution, which has the following beneficial effects:

[0026] 1. During the spinning solution delivery process, the viscosity sensor monitors the viscosity of the spinning solution in real time and transmits the viscosity data to the signal processor. The signal processor analyzes and processes the collected viscosity data and then sends adjustment commands to the frequency converter. The frequency converter controls the pumping speed of the two delivery pumps, thereby controlling the content of polymer solution and auxiliary agent solution and adjusting their mixing ratio.

[0027] 2. The signal processor can also control the length adjustment device. Since the groove and the protrusion are engaged, the mixing supply pipe can be retracted into the sleeve or released outside the sleeve by controlling the rotation of the track, thereby changing the length of the mixing supply pipe actually used for online mixing outside the sleeve, and thus controlling the mixing efficiency of the polymer solution and the additive solution. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the liquid supply device of the present invention;

[0029] Figure 2 This is a schematic diagram of the liquid storage tank of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the tee connector of the present invention;

[0031] Figure 4 This is a schematic diagram of the internal structure of the length adjustment device of the present invention;

[0032] Figure 5 This is a top view of the length adjustment device of the present invention;

[0033] Figure 6 This is a schematic diagram of the track device of the present invention;

[0034] Figure 7 This is a cross-sectional view of the mixing liquid supply pipeline of the present invention;

[0035] Figure 8 This diagram shows the three adjustment states of the mixing liquid supply pipeline of the present invention.

[0036] In the diagram: 1. Liquid storage tank; 11. Liquid storage chamber; 2. Delivery pump; 3. T-joint; 4. Length adjustment device; 41. Sleeve; 42. Guide tube; 43. Track device; 431. Frame body; 432. Track strip; 433. Protrusion; 434. Support column; 435. First connecting rod; 436. Limiting component; 437. Second connecting rod; 438. Telescopic cylinder; 439. Limiting groove; 5. Mixing supply pipeline; 51. Groove; 6. Viscosity sensor; 7. Signal processor; 8. Variable frequency drive; 9. First delivery pipeline; 10. Second delivery pipeline. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0038] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Example 1

[0042] Reference Figure 1-8 A liquid supply device for online mixing of spinning solution includes a liquid storage tank 1, two delivery pumps 2, a three-way connector 3, a length adjustment device 4, a mixing liquid supply pipe 5, a viscosity sensor 6, a signal processor 7, and a frequency converter 8.

[0043] The liquid storage tank 1 has two liquid storage chambers 11; the inlets of the two delivery pumps 2 are respectively connected to the two liquid storage chambers 11 through the first delivery pipe 9; the two inlets of the three-way connector 3 are respectively connected to the outlets of the two delivery pumps 2 through the second delivery pipe 10.

[0044] The length adjustment device 4 includes a sleeve 41, inside which a guide tube 42 is fixed. The guide tube 42 is connected to the liquid outlet of the three-way connector 3. The inner wall of the sleeve 41 is provided with a track device 43. The track device 43 includes a frame body 431. Track strips 432 are rotatably mounted on the frame body 431. The outer side of the track strips 432 has several protrusions 433. One end of the mixing liquid supply pipe 5 is sleeved on the guide tube 42. The mixing liquid supply pipe 5 is a retractable corrugated pipe structure with several grooves 51 on its outer surface. The grooves 51 are engaged with the protrusions 433 of the track strips 432.

[0045] Viscosity sensor 6 is located at the other end of the mixing supply pipeline 5; signal processor 7 is electrically connected to viscosity sensor 6 and length adjustment device 4; frequency converter 8 is electrically connected to signal processor 7 and the two delivery pumps 2 respectively.

[0046] In one specific implementation, the track device 43 further includes a support column 434, a first connecting rod 435, a limiting member 436, a second connecting rod 437, and a telescopic cylinder 438.

[0047] The support column 434 is fixed on the inner wall of the sleeve 41, and a limiting groove 439 is formed on the support column 434; the two ends of the first connecting rod 435 are rotatably connected to the frame body 431 and the support column 434 respectively; the limiting member 436 is slidably inserted in the limiting groove 439; the two ends of the second connecting rod 437 are rotatably connected to the frame body 431 and the limiting member 436 respectively; the telescopic cylinder 438 is fixed below the limiting member 436, and its output shaft is fixedly connected to the limiting member 436.

[0048] To facilitate the installation of the mixing liquid supply pipeline 5, the above design was implemented. When installing the mixing liquid supply pipeline 5, it is sleeved on the guide tube 42, the output axis of the telescopic cylinder 438 extends upward, the support limiting member 436 slides upward in the limiting groove 439, and then the support frame body 431 moves towards the guide tube 42 through the second connecting rod 437 until the protrusion 433 of the track strip 432 is smoothly inserted into the groove 51 of the mixing liquid supply pipeline 5, thus completing the installation of the mixing liquid supply pipeline 5.

[0049] In this embodiment, two first connecting rods 435 and a second connecting rod 437 are provided on both sides of the frame body 431. The limiting member 436 has a U-shaped structure, and its two ends are rotatably connected to the second connecting rods 437 on both sides. The limiting member 436 can slide in the limiting groove 439 to ensure the extension and retraction stability of the output shaft of the telescopic cylinder 438.

[0050] In one specific implementation, there are at least three track devices 43, which are evenly arranged on the inner wall of the sleeve 41 so that the mixing liquid supply pipe 5 is evenly stressed.

[0051] In one specific implementation, the liquid storage chamber 11 is a box structure with a partition fixed in the middle to form two liquid storage chambers 11. This compact dual-tank liquid storage system can minimize space occupation.

[0052] Both the first conveying pipe 9 and the second conveying pipe 10 are made of inert perfluoroethylene propylene (FEP). The selection of this material significantly reduces the friction between the solution and the inner wall of the pipe, reduces the probability of pipe blockage during the conveying process, and the milky white, semi-transparent to transparent properties of FEP material provide an intuitive visual monitoring capability for the conveying status of the solution in the pipe.

[0053] In one specific implementation, the end of the first conveying pipe 9 connected to the liquid storage chamber 11 is shaped like a flared mouth to reduce energy loss at the inlet and ensure that the fluid flow pressure loss coefficient is below 0.1%. The inner diameter of the bottom of the flared mouth is 10-20 mm, and the inner diameter of the first conveying pipe 9 and the second conveying pipe 10 is 5-10 mm, with a wall thickness of 0.5-2 mm, to ensure uniform flow and continuous delivery of the solution.

[0054] In one specific implementation, the inlet and outlet of the three-way connector 3 both adopt a grooved connection structure, which ensures stable connection and convenient disassembly.

[0055] The working principle of this invention is as follows:

[0056] Two storage chambers 11 are used to store polymer solution and auxiliary agent solution respectively. During operation, two delivery pumps 2 deliver the polymer solution and auxiliary agent solution to the tee connector 3 through the first delivery pipe 9 and the second delivery pipe 10. Then, the solution flows into the mixing supply pipe 5 through the tee connector 3 and the guide pipe 42 and is mixed online to form spinning solution. Finally, the solution is delivered to the nozzle for electrostatic spinning. In this invention, the mixing supply pipe 5 is a corrugated pipe structure, which can effectively disturb the steady flow of the fluid and induce vortex phenomenon compared with the traditional straight pipe structure, thereby improving the mixing efficiency of polymer solution and auxiliary agent solution.

[0057] During the spinning solution delivery process, the viscosity sensor 6 monitors the viscosity of the spinning solution in real time and transmits the viscosity data to the signal processor 7. The signal processor 7 analyzes and processes the collected viscosity data and then sends adjustment commands to the frequency converter 8. The frequency converter 8 controls the pumping speed of the two delivery pumps 2, thereby controlling the content of the polymer solution and auxiliary agent solution and adjusting their mixing ratio. In addition, the signal processor 7 can also control the length adjustment device 4. Since the groove 51 and the protrusion 433 are engaged, the mixing supply pipe 5 can be retracted into the sleeve 41 or released outside the sleeve 41 by controlling the rotation of the track 432. This changes the length of the mixing supply pipe 5, which is actually used for online mixing outside the sleeve 41, thereby controlling the mixing efficiency of the polymer solution and auxiliary agent solution.

[0058] The longer the mixing supply pipe 5 used for online mixing, the more corrugations it has, resulting in higher mixing efficiency of the polymer solution and the additive solution, and vice versa. To ensure an adjustable range of mixing efficiency, in this embodiment, the length of the mixing supply pipe 5 is 70-120 cm, and the number of corrugations is 40-60 to adapt to different mixing requirements. Its minimum inner diameter is 5-10 mm, and its maximum inner diameter is 10-12 mm to optimize fluid dynamics performance. Furthermore, to ensure the continuity of the corrugated pipe under compression, the wall thickness is controlled below 0.5 mm.

[0059] This invention controls the pumping speed of two delivery pumps 2 by using a frequency converter driver 8, which can control the content of polymer solution and auxiliary agent solution. The mixing efficiency of polymer solution and auxiliary agent solution can be controlled by the length adjustment device 4, thereby obtaining a spinning solution with suitable viscosity and meeting the applicability requirements of inlay spinning equipment for spinning complex solution systems.

[0060] The following description, in conjunction with more specific embodiments, provides further details.

[0061] Example 2

[0062] When preparing PVA-based water-resistant micro / nanofibers using a traditional liquid supply device, a 7-10 wt% PVA aqueous solution (PVA Mw not greater than 100,000, viscosity not greater than 1,000 mPa·s) and a liquid crosslinking agent aqueous aliphatic isocyanate (viscosity not greater than 1,500 mPa·s) are mixed in a mixing tank to form a spinning solution, which is then pumped and piped to a nozzle for spinning. During the spinning process, the degree of crosslinking of the PVA aqueous solution and the liquid crosslinking agent aqueous aliphatic isocyanate in the mixing tank increases over time, causing the viscosity of the spinning solution to increase continuously. This makes it impossible for the spinning solution to maintain a stable viscosity, resulting in significant differences between the PVA-based water-resistant micro / nanofibers prepared before and after the process.

[0063] In preparing PVA-based water-resistant micro / nanofibers according to this invention: a PVA aqueous solution with a mass concentration of 7-10 wt% (PVA Mw not greater than 100,000, viscosity not greater than 1,000 mPa·s) is injected into one storage chamber 11, and a liquid crosslinking agent aqueous aliphatic isocyanate (viscosity not greater than 1,500 mPa·s) is injected into another storage chamber 11. Two delivery pumps 2 deliver the above two solutions to the three-way connector 3 through the first delivery pipe 9 and the second delivery pipe 10, and then flow into the mixing supply pipe 5 through the three-way connector 3 and the guide pipe 42 to mix online to form a spinning solution. Finally, it is delivered to the nozzle for electrospinning. By mixing online, the degree of crosslinking of the PVA aqueous solution and the liquid crosslinking agent aqueous aliphatic isocyanate remains consistent, ensuring that the spinning solution maintains a stable viscosity, and thus preparing PVA-based water-resistant micro / nanofibers with stable properties.

[0064] Example 3

[0065] This invention prepares micro / nanofibers with varying drug loading: a polymer solution is injected into one reservoir 11, and a functional substance solution (antibacterial agent, fragrance, acaricide, etc.) is injected into another reservoir 11. Two delivery pumps 2 deliver the two solutions to a three-way connector 3 via a first delivery pipe 9 and a second delivery pipe 10. The solutions then flow into a mixing supply pipe 5 via the three-way connector 3 and a guide pipe 42, where they are mixed online to form a spinning solution. Finally, the solution is delivered to a nozzle for electrospinning. By adjusting the pumping speed of the polymer solution using the delivery pumps 2, micro / nanofibers with varying drug loading can be prepared.

[0066] Example 4

[0067] This invention prepares micro / nanofibers with dynamically changing diameters: a low-concentration spinning solution (polymer mass fraction 5-10 wt%) is injected into one storage chamber 11, and a high-concentration spinning solution (polymer mass fraction 15-20 wt%) is injected into another storage chamber 11. Two delivery pumps 2 transport the two solutions to a three-way connector 3 through a first delivery pipe 9 and a second delivery pipe 10. The solutions then flow into a mixing supply pipe 5 via the three-way connector 3 and a guide pipe 42, where they are mixed online to form a spinning solution. Finally, the solution is delivered to a nozzle for electrospinning. By adjusting the mixing ratio of the two spinning solutions using the two delivery pumps 2, micro / nanofibers with dynamically changing diameters can be prepared.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid supply device for online mixing of spinning solution, characterized in that: include The liquid storage tank has two liquid storage chambers; Two delivery pumps have their inlets connected to the two liquid storage chambers respectively via a first delivery pipe; The three-way connector has two inlets that are connected to the outlets of the two delivery pumps via a second delivery pipe. A length adjustment device includes a sleeve, a guide tube fixed inside the sleeve, the guide tube communicating with the liquid outlet of the tee connector, and a track device provided on the inner wall of the sleeve. The track device includes a frame body, and a track strip is rotatably mounted on the outside of the frame body. The track strip has several protrusions on its outer side. A mixing liquid supply pipe is fitted onto the guide pipe at one end. The mixing liquid supply pipe has a retractable corrugated pipe structure and several grooves on its outer surface. The grooves are engaged with the protrusions of the track strip. A viscosity sensor is located at the other end of the mixing supply pipeline; The signal processor is electrically connected to the viscosity sensor and the length adjustment device; The frequency converter is electrically connected to the signal processor and the two delivery pumps, respectively. The track device also includes A support column is fixed on the inner wall of the sleeve, and a limit groove is formed on the support column; The first connecting rod is rotatably connected at both ends to the main frame body and the support column, respectively. The limiting component is slidably inserted into the limiting groove; The second connecting rod is rotatably connected at both ends to the frame body and the limiting member, respectively. A telescopic cylinder is fixed below the limiting member, and its output shaft is fixedly connected to the limiting member.

2. The liquid supply device for online mixing of spinning solution according to claim 1, characterized in that: The track device comprises at least three pieces, which are evenly arranged on the inner wall of the sleeve.

3. The liquid supply device for online mixing of spinning solution according to claim 1, characterized in that: The liquid storage tank has a box structure, with a partition fixed in the middle to form two liquid storage chambers.

4. The liquid supply device for online mixing of spinning solution according to claim 1, characterized in that: The end of the first delivery pipe that connects to the liquid storage chamber is flared.

5. A liquid supply device for online mixing of spinning solution according to claim 1, characterized in that: The inlet and outlet of the tee connector both adopt a grooved connection structure.

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