Coagulating bath machine head box

Abstract

The utility model belongs to the field of spinning, and discloses a coagulating bath machine head box, which comprises a box body, a plurality of glue distributing channels, a plurality of glue distributing channels, a plurality of glue distributing channels and a plurality of glue distributing channels, the first glue inlet and the second glue inlet are formed in two opposite sides of the glue cavity and are communicated with the glue cavity; a spinning solution enters the glue cavity through the first glue inlet and the second glue inlet and then is output through the distribution glue channel. According to the coagulating bath machine head box disclosed by the utility model, the glue inlets are respectively formed in the two opposite sides, so that a flowing dead zone in a glue cavity can be eliminated by feeding glue on the two sides, the formation of thermal gel is avoided, the glue supply quality is improved, the production stability is improved, and the quality of carbon fiber precursors is also improved.

Description

Technical Field

[0001] The utility model belongs to the field of spinning, and in particular relates to a coagulation bath head box. Background Art

[0002] The demand for polyacrylonitrile as the main raw material for producing new material carbon fiber is increasing. The main spinning methods of polyacrylonitrile fiber include wet spinning, dry-wet spinning, gel spinning, and electrospinning. Among them, wet spinning and dry-jet wet spinning are one of the important spinning methods used for polyacrylonitrile fiber.

[0003] In both wet spinning and dry-jet wet spinning, the fibers undergo a coagulation bath forming process. In the wet spinning process, after the spinning solution is extruded from the spinneret into the coagulation bath, the surface layer of the spinning stream first contacts the coagulation medium and quickly coagulates into a thin layer. The coagulant in the coagulation bath continuously diffuses into the stream through this surface layer, and the solvent in the stream also continuously diffuses into the coagulation bath through the surface layer. This process is the double diffusion process in wet forming. Due to the continuous double diffusion, the epidermis of the spinning stream continues to thicken. When the solvent concentration in the middle part of the stream drops below a certain critical value, the spinning stream undergoes phase separation, that is, the nascent fiber precipitates from the bath, accompanied by a certain degree of volume shrinkage.

[0004] A coagulation bath head box is generally provided at the front end of the coagulation bath tank, and a glue inlet is provided on the coagulation bath head box. The spinning stock solution first enters the coagulation bath head box through the glue supply line through the glue inlet, and then is output to the spinneret located in the coagulation bath. The spinning stock solution is extruded from the spinneret hole into the coagulation bath for double diffusion. However, the current coagulation bath head box only has a glue inlet on one side, and the opposite side is closed, or a glue inlet is provided on one side, and a glue return port for returning the spinning stock solution to the glue making system is provided on the opposite side. During spinning production, the glue inlet continuously feeds glue, and the glue return port is in a normally closed state.

[0005] Under this setting, the glue cavity of the coagulation bath head box has poor glue fluidity with the glue path closest to the glue return port or the closed side, forming a dead zone. The closer to the closed side or the glue return port, the worse the glue flow. During the production of carbon fiber precursor, a certain box temperature is required in the coagulation bath head box as support. Since the glue with poor fluidity in the dead zone will form hot gel under long-term high temperature (80-90°C), the glue in the coagulation bath head box is a fluid. During the flow of the glue, the glue will carry away the hot gel that has not been fully formed. The glue in this state will be pumped out by the metering pump through the spinneret, which will cause poor raw yarn output, thereby affecting the stability of carbon fiber precursor production and the quality of the raw yarn. In order to eliminate the dead zone and avoid the formation of hot gel, improve the quality of glue supply, and improve the quality of carbon fiber precursor, it is necessary to improve the coagulation bath head box.

[0006] In view of this, the present utility model is proposed. Utility Model Content

[0007] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a coagulation bath head box with glue inlets on both sides, which can eliminate the flow dead zone in the glue cavity, avoid the formation of hot gel, improve the glue supply quality, and improve the quality of carbon fiber precursor.

[0008] In order to solve the above technical problems, the basic concept of the technical solution adopted by the utility model is:

[0009] The utility model provides a coagulation bath head box, comprising:

[0010] A box body, wherein a glue cavity is provided in the box body, and the glue cavity is communicated with a plurality of glue distribution channels;

[0011] The first glue inlet and the second glue inlet are arranged on opposite sides of the glue cavity and communicated with the glue cavity;

[0012] The spinning solution enters the glue cavity through the first glue inlet and the second glue inlet, and then is output through the distribution glue channel.

[0013] Furthermore, the first glue inlet is connected to the glue supply pipeline through a first pipeline, and the second glue inlet is connected to the glue supply pipeline through a second pipeline.

[0014] Furthermore, the first pipeline is provided with a first control valve, and / or the second pipeline is provided with a second control valve.

[0015] Furthermore, the first glue inlet and the second glue inlet are at the same height.

[0016] Furthermore, the diameters of the first glue inlet and the second glue inlet are the same.

[0017] Furthermore, the first glue inlet and the second glue inlet are symmetrically arranged on both sides of the glue cavity, and the axes of the first glue inlet and the second glue inlet coincide with each other.

[0018] Furthermore, the plurality of glue distribution channels are spaced apart in the length direction of the glue cavity, the first glue inlet and the second glue inlet are located in the width direction of the glue cavity, and the axial direction of the first glue inlet and the second glue inlet is perpendicular to the axial direction of the glue distribution channel.

[0019] Furthermore, a metering pump is provided corresponding to each distribution rubber channel, and the spinning solution in the rubber cavity is output through the metering pump and the distribution rubber channel.

[0020] Furthermore, a plurality of curved pipes are arranged on the top of the box body corresponding to the distribution rubber channel, one end of each curved pipe is connected to a distribution rubber channel, and the other end is connected to the spinneret.

[0021] Furthermore, a heating device is included to heat the spinning solution in the glue cavity.

[0022] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art.

[0023] 1. The coagulation bath head box of the utility model is provided with double-sided glue inlets, which can eliminate the dead zone caused by the single-sided glue inlet of the original coagulation bath head box, so that the glue supply pipe line and the glue in the glue cavity form sufficient flow, which can completely solve the problem of no-heat gelation, achieve the clean production state of the coagulation bath head box, and improve the quality of the glue.

[0024] 2. The coagulation bath head box of the utility model is provided with double-sided glue inlet, which can improve the pressure balance of the glue liquid in the coagulation bath head box and is beneficial to the stability of the linear density index of the carbon fiber precursor. After the coagulation bath head box is changed from one-sided glue inlet to double-sided glue inlet, the production stability of the carbon fiber precursor is greatly improved, and the filter cloth on the spinneret is no longer found to be hot gel particles generated by the dead zone of glue supply, and the single-filament hole phenomenon of the carbon fiber precursor is also greatly reduced.

[0025] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of the coagulation bath head box and the coagulation bath box of the utility model;

[0028] Figure 2 It is a structural schematic diagram of the coagulation bath head box of the utility model;

[0029] In the figure: 100 coagulation bath head box, 200 coagulation bath box, 300 spinneret, 400 nascent fiber;

[0030] 1 box body, 2 glue chamber, 3 first glue inlet, 4 second glue inlet, 5 first pipeline, 6 second pipeline, 7 glue supply pipeline, 8 first control valve, 9 second control valve, 10 glue distribution channel, 11 gooseneck tube, 12 metering pump.

[0031] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] refer to Figure 1 As shown, the coagulation bath head box 100 can also be called the spinning head box, which is the front end of the spinning line, and the downstream thereof is the coagulation bath box 200. The glue supply pipeline 7 for conveying the spinning solution is connected to the coagulation bath head box 100, and the coagulation bath head box 100 is connected to the spinneret 300 through the gooseneck tube 11. Each spinneret 300 is located in the glue channel of the coagulation bath box 200. The coagulation bath box 200 is filled with coagulation bath liquid. After the spinning solution enters the coagulation bath head box 100, it is distributed and output to each spinneret 300 through the gooseneck tube 11. The spinning solution is extruded from the spinneret hole into the coagulation bath, and the primary fiber 400 is formed through double diffusion, and then the fiber is formed through subsequent drawing and other steps.

[0036] It should be noted that the spinning solution is also called stock solution, commonly known as glue. In the following embodiments, "glue" or "glue solution" refers to the spinning solution.

[0037] The existing glue feeding method of the coagulation bath head box 100 is one-side glue feeding. The specific structure is that a glue feeding port is provided on one side, and the other side is closed or a glue return port. A valve is provided at the glue return port, and the spinning solution can be returned to the glue making system through the glue return port. In the normal spinning production process, the glue return port is in a closed state. Therefore, with this one-side glue feeding method, the side of the coagulation bath head box 100 close to the closed or set glue return port, the glue fluidity will form a dead zone, and the closer the position is to the closed side or the glue return port valve, the worse the glue fluidity.

[0038] In the production process of carbon fiber precursor, the coagulation bath head box 100 needs to maintain a certain temperature of the box 1, and the glue with poor fluidity in the dead zone will form hot gel under long-term high temperature (80-90°C). The glue in the coagulation bath head box 100 is a fluid and will be transported to the next step. During the flow of the glue, the hot gel that has not been fully formed will be taken away. The glue in this state will cause poor raw yarn after being pumped out by the metering pump 12 and passing through the spinneret, thereby affecting the stability of carbon fiber precursor production and the quality of the raw yarn.

[0039] refer to Figure 2 As shown, the utility model provides a coagulation bath head box 100, comprising:

[0040] A box body 1, wherein a glue cavity 2 is provided in the box body 1, and the glue cavity 2 is connected to a plurality of glue distribution channels 10;

[0041] The first glue inlet 3 and the second glue inlet 4 are arranged on opposite sides of the glue cavity 2 and communicated with the glue cavity 2;

[0042] The spinning solution enters the glue chamber 2 through the first glue inlet 3 and the second glue inlet 4, and then is output through the glue distribution channel 10.

[0043] The coagulation bath machine head box 100 of the utility model is provided with a first glue inlet 3 and a second glue inlet 4 on opposite sides of the glue cavity 2, respectively. The two glue inlets feed glue at the same time, ensuring that the colloid in the glue cavity 2 can fully flow, eliminating the flow dead zone, and avoiding the formation of hot gel. On the one hand, the clean production state of the coagulation bath machine head box 100 is achieved, and the quality of the glue is improved; on the other hand, the double-sided glue feeding can improve the pressure balance of the glue liquid in the coagulation bath machine head box 100, which is beneficial to the stability of the fiber linear density index, reduces the hole phenomenon of the fiber monofilament, improves the production stability, and also improves the fiber quality.

[0044] The gel cavity 2 is a cavity in the box body 1, which is used to accommodate the spinning solution to be redistributed through multiple distribution pipes, enter the spinneret 300 in the next step, and be extruded into the coagulation bath through the spinneret.

[0045] The first glue inlet 3 is connected to the glue supply pipeline 7 through the first pipeline 5 , and the second glue inlet 4 is connected to the glue supply pipeline 7 through the second pipeline 6 .

[0046] The glue supply pipeline 7 refers to a pipeline for conveying spinning solution. The first glue inlet 3 and the second glue inlet 4 are connected to the glue supply pipeline 7 through pipelines respectively. The spinning solution in the glue supply pipeline 7 can be conveyed to the two glue inlets respectively to achieve simultaneous glue feeding.

[0047] As a specific implementation method, an improvement can be made on the original single-sided glue-feeding coagulation bath head box 100, and a joint and two branch pipes are set on the glue supply pipe 7 at the original glue inlet, one branch pipe is connected to the first glue inlet 3, and the other branch pipe is connected to the second glue inlet 4. In this way, it can be achieved by making a small modification on the original device.

[0048] As an implementation manner, the first pipeline 5 is provided with a first control valve 8 , and / or the second pipeline 6 is provided with a second control valve 9 .

[0049] Control valves are respectively arranged on the first pipeline 5 and the second pipeline 6 to realize separate control of the two-way glue feeding, and it is also easy to control and measure the glue feeding amount on both sides. Glue can be fed to both sides at the same time, or to one side when necessary, which is more flexible and can cope with various situations.

[0050] As an implementation manner, the first glue inlet 3 and the second glue inlet 4 are at the same height.

[0051] The glue inlets located on two opposite sides have the same height, so when the spinning solution on both sides enters, the fluidity of the glue solution in the entire glue cavity 2 can be better. Under the premise that the temperature of the glue cavity 2 needs to be controlled, the properties and temperature of the spinning solution in the glue cavity 2 are more uniform, avoiding dead zones.

[0052] As an implementation manner, the diameters of the first glue inlet 3 and the second glue inlet 4 are the same.

[0053] The first glue inlet 3 and the second glue inlet 4 have the same diameter, so it is easy to control the glue flow rates of the two to be the same. When the glue flow rates are the same, the flow properties of the two are similar, which is beneficial to controlling the properties and temperature of the overall spinning solution in the glue cavity 2 to be more uniform.

[0054] As an implementation manner, the first glue inlet 3 and the second glue inlet 4 are symmetrically arranged on both sides of the glue cavity 2, and the axes of the first glue inlet 3 and the second glue inlet 4 coincide with each other.

[0055] In this way, the first glue inlet 3 and the second glue inlet 4 are arranged opposite to each other, and the glue liquid entering from both sides can make the fluidity of the glue liquid in the entire glue cavity 2 very good, and the properties and temperature of the spinning solution in the glue cavity 2 are more uniform, avoiding dead zones.

[0056] As an embodiment, multiple distribution glue channels 10 are spaced apart in the length direction of the glue cavity 2, the first glue inlet 3 and the second glue inlet 4 are located in the width direction of the glue cavity 2, and the axial direction of the first glue inlet 3 and the second glue inlet 4 is perpendicular to the axial direction of the distribution glue channel 10.

[0057] Since there are a large number of distribution glue channels 10, multiple distribution glue channels 10 are spaced apart in the length direction of the coagulation bath head box 100, and the two glue inlets are distributed in the width direction of the glue chamber 2. In this way, the glue entering from both sides will not directly enter the distribution glue channel 10, but will be buffered in the glue chamber 2 first and then enter the distribution glue channel 10, which is more conducive to stable spraying and improving the uniformity of fiber quality.

[0058] As an implementation mode, a metering pump 12 is provided corresponding to each distribution rubber channel 10 , and the spinning solution in the rubber cavity 2 is output through the metering pump 12 and the distribution rubber channel 10 .

[0059] As an implementation manner, a plurality of curved pipes are arranged on the top of the box body 1 corresponding to the distribution rubber channel 10 , and one end of each curved pipe is connected to a distribution rubber channel 10 , and the other end is connected to the spinneret 300 .

[0060] The curved pipe may be a gooseneck 11 , which is used to transport the spinning solution to the spinneret 300 , and to generate the nascent fibers 400 through double diffusion in the coagulation bath 200 .

[0061] As an implementation mode, a heating device is included to heat the spinning solution in the glue cavity 2 .

[0062] The heating device can adopt a conventional heating method in the prior art.

[0063] As an embodiment, the specific process of the spinning solution passing through the coagulation bath head box 100 includes:

[0064] The spinning solution in the glue supply pipe 7 enters the first glue inlet 3 through the first pipe 5, enters the second glue inlet 4 through the second pipe 6, and is collected in the glue cavity 2. The heating device heats the spinning solution in the glue cavity 2 to control the temperature within a certain range; then, under the action of the metering pump 12, it is output to the curved pipe through multiple distribution glue channels 10, and then enters the spinneret 300, extruded into the coagulation bath, and forms primary fibers 400 through double diffusion, and then forms carbon fiber precursors through subsequent drawing and other steps.

[0065] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. A coagulation bath head box, characterized in that: include: A box body, wherein a glue cavity is provided in the box body, and the glue cavity is communicated with a plurality of glue distribution channels; The first glue inlet and the second glue inlet are arranged on opposite sides of the glue cavity and communicated with the glue cavity; The spinning solution enters the glue cavity through the first glue inlet and the second glue inlet, and then is output through the distribution glue channel.

2. The coagulation bath head box according to claim 1, characterized in that: The first glue inlet is communicated with the glue supply pipeline through the first pipeline, and the second glue inlet is communicated with the glue supply pipeline through the second pipeline.

3. The coagulation bath head box according to claim 2, characterized in that: The first pipeline is provided with a first control valve, and / or the second pipeline is provided with a second control valve.

4. The coagulation bath head box according to any one of claims 1 to 3, characterized in that: The first glue inlet and the second glue inlet are at the same height.

5. The coagulation bath head box according to any one of claims 1 to 3, characterized in that: The diameters of the first glue inlet and the second glue inlet are the same.

6. The coagulation bath head box according to any one of claims 1 to 3, characterized in that: The first glue inlet and the second glue inlet are symmetrically arranged on both sides of the glue cavity, and the axes of the first glue inlet and the second glue inlet coincide with each other.

7. The coagulation bath head box according to any one of claims 1 to 3, characterized in that: The plurality of distributing glue channels are spaced apart in the length direction of the glue cavity, the first glue inlet and the second glue inlet are located in the width direction of the glue cavity, and the axial direction of the first glue inlet and the second glue inlet is perpendicular to the axial direction of the distributing glue channels.

8. The coagulation bath head box according to any one of claims 1 to 3, characterized in that: A metering pump is provided corresponding to each distribution rubber channel, and the spinning solution in the rubber cavity is output through the metering pump and the distribution rubber channel.

9. The coagulation bath head box according to any one of claims 1 to 3, characterized in that: A plurality of curved pipes are arranged on the top of the box body corresponding to the distribution rubber channel, one end of each curved pipe is communicated with a distribution rubber channel, and the other end is connected with the spinneret.

10. The coagulation bath head box according to any one of claims 1 to 3, characterized in that: The utility model comprises a heating device for heating the spinning solution in the glue cavity.

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