Online mixing system for coloring polyimide stock solution

Abstract

An online mixing system for polyimide stock solution coloring comprises a preliminary mixing mechanism, a full mixing mechanism and a feeding pipe, the full mixing mechanism comprises a horizontally-placed 8-shaped mixing tank, the 8-shaped mixing tank is composed of a first horizontal tank body and a second horizontal tank body, the top of the first horizontal tank body is connected with the preliminary mixing mechanism through the feeding pipe, and the top of the second horizontal tank body is connected with the primary mixing mechanism through the feeding pipe. A discharging pipe is arranged at the bottom of the second horizontal tank body, stirring mechanisms are arranged in the first horizontal tank body and the second horizontal tank body, and the rotating speed of the stirring mechanism in the first horizontal tank body is smaller than that of the stirring mechanism in the second horizontal tank body. The online mixing system for coloring the polyimide stock solution has the beneficial effects that the primary mixing mechanism and the sufficient mixing mechanism are adopted to form a multi-stage online dynamic mixing system, and the rotating speed of the stirring mechanism in the first horizontal tank body is smaller than that of the stirring mechanism in the second horizontal tank body; and no mixing dead angle exists in the full mixing mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of spinning machinery, in particular to an online mixing system for polyimide stock solution coloring. Background Art

[0002] The polyimide stock solution needs to be colored before spinning, because the viscosity of the polyimide stock solution reaches 3000-7000Pas, which belongs to the ultra-high viscosity material range, and the stock solution coloring is very difficult. Conventional polyimide stock solution coloring uses conventional reactors for stirring, and the stock solution after coloring has color difference and other uneven stirring conditions. Using conventional reactors for stirring is intermittent production, which takes a lot of time and has low production efficiency.

[0003] The Chinese utility model patent with authorization announcement number CN216266768U discloses a new type of mixing device for limestone with a large amount of cement grinding aid, including a mixing tank body, a spiral mixing device A, a spiral mixing device B, a rotating motor A, a rotating motor B and a support plate. The longitudinal section of the mixing tank body is a horizontal "8" shape. The mixing tank body is provided with a feed inlet and a discharge port. The spiral mixing device A and the spiral mixing device B are both located in the mixing tank body. The spiral mixing device A and the spiral mixing device B are engaged with each other. The spiral mixing device A is the same as the spiral mixing device B. The rotating motor A is fixedly connected to the spiral mixing device A through a motor shaft, and the rotating motor B is fixedly connected to the spiral mixing device B through a motor shaft. The support plate is fixed on the lower end surface of the mixing tank body. This technical solution uses a spiral mixing device to mix and transport materials, which is only suitable for mixing materials with larger particles, and has poor mixing efficiency for different solutions. In addition, the spiral mixing device simultaneously transports the materials forward during the mixing process, the mixing time is short, and no turbulence is generated in the mixing tank, resulting in poor mixing effect. Utility Model Content

[0004] The purpose of the utility model is to make the color paste more easily combined with the stock solution, improve the dispersibility of the color paste and enable continuous online production and mixing. In view of the above-mentioned shortcomings of the prior art, an online mixing system for polyimide stock solution coloring is proposed.

[0005] An online mixing system for polyimide stock solution coloring comprises a preliminary mixing mechanism, a full mixing mechanism and a feeding pipe, wherein the preliminary mixing mechanism comprises a preliminary mixing tank, and the full mixing mechanism comprises a horizontally placed 8-shaped mixing tank, wherein the 8-shaped mixing tank is composed of a first horizontal tank body and a second horizontal tank body, wherein the side walls of the first horizontal tank body and the second horizontal tank body are connected, the top of the first horizontal tank body is connected to the preliminary mixing mechanism through a feeding pipe, and the bottom of the second horizontal tank body is provided with a discharge pipe, and the preliminary mixing tank, the first horizontal tank body and the second horizontal tank body are all provided with a stirring mechanism, and the rotation speed of the stirring mechanism in the first horizontal tank body is lower than that of the stirring mechanism in the second horizontal tank body.

[0006] By adopting the above technical scheme: the online mixing system for polyimide stock solution coloring adopts a multi-stage online dynamic mixing tank, including a preliminary mixing mechanism and a sufficient mixing mechanism. The polyimide stock solution passes through the stock solution feed valve and the color paste passes through the color paste feed valve and enters the preliminary mixing mechanism in a certain proportion, and is preliminarily mixed and stirred in the preliminary mixing mechanism. The preliminary mixed stock solution then enters the sufficient mixing mechanism through the feeding pipe. The sufficient mixing mechanism is formed by connecting the side walls of the first horizontal tank body and the second horizontal tank body. The preliminary mixed liquid enters the first horizontal tank body along the feeding pipe, and then flows into the second horizontal tank body. After mixing, it is discharged from the discharge pipe at the bottom of the second horizontal tank body.

[0007] The rotation speed of the stirring mechanism in the first horizontal tank body is lower than that of the stirring mechanism in the second horizontal tank body, so the flow rate of the mixed liquid in the second horizontal tank body is greater than that of the first horizontal tank body. Therefore, the mixed liquid in the second horizontal tank body can draw the mixed liquid in the first horizontal tank body into the second horizontal tank body, so that the mixed liquid in the first horizontal tank body and the second horizontal tank body can be fully exchanged. After the preliminary mixed liquid is further mixed in the first horizontal tank body, it enters the second horizontal tank body for final mixing under the action of the stirring mechanism.

[0008] By setting the stirring mechanism in the first horizontal tank body to rotate at a speed lower than that in the second horizontal tank body, there is no mixing dead corner in the fully mixing mechanism; at the same time, the secondary mixed liquid after stirring in the first horizontal tank body gradually enters the second horizontal tank body for further stirring, and the polyimide stock solution after the third mixing can be fully mixed with the color paste.

[0009] The above technical solution is further configured as follows: the speed ratio of the stirring mechanism in the first horizontal tank body to the stirring mechanism in the second horizontal tank body is 1:3-4:5.

[0010] The above technical solution is further configured as follows: the stirring mechanism includes a rotating shaft, a stirring paddle arranged on the rotating shaft, and a driving member for driving the rotating shaft to rotate.

[0011] The above technical solution is further configured as follows: the stirring paddle includes a plurality of long impellers and a plurality of short impellers, and the long impellers and the short impellers are alternately arranged on the rotating shaft along the axial direction of the rotating shaft.

[0012] By adopting the above technical solution: by arranging a long impeller and a short impeller, the liquid in different positions in the tank body can be stirred, turbulence can be generated in the tank body, and the mixing effect can be improved.

[0013] The above technical solution is further configured as follows: the long impeller includes a plurality of long paddles and a first stirring blade, the plurality of long paddles are evenly fixed on the rotating shaft along the circumferential direction, and the long paddles are fixedly connected to a plurality of first stirring blades.

[0014] The above technical solution is further configured as follows: the short impeller includes a plurality of short paddles and second stirring blades, the plurality of short paddles are evenly fixed on the rotating shaft along the circumferential direction, and the plurality of second stirring blades are fixedly connected to the short paddles.

[0015] The above technical solution is further configured as follows: the long paddle and the short paddle are obliquely arranged on the rotating shaft, and the angles between the long paddle and the short paddle and the rotating shaft are complementary.

[0016] By adopting the above technical solution: the inclination angles of the long paddle and the short paddle are complementary, and when the stirring mechanism rotates, the mixed liquid can be pushed in two opposite directions at the same time, thereby accelerating the mixing of the original liquid and the color paste.

[0017] The above technical solution is further configured as follows: the angle between the first stirring blade and the long paddle is 45°-75°, and the angle between the second stirring blade and the short paddle is 50°-70°.

[0018] By adopting the above technical solution: the stirring blades on the long paddle and the short paddle are set at different inclination angles, the mixing efficiency can be improved.

[0019] The above technical solution is further configured as follows: a feed pump and a feed pipe are provided above the preliminary mixing tank.

[0020] By adopting the above technical solution: the feed pump pumps the stock solution and the color paste into the preliminary mixing mechanism, and after the stock solution and the color paste are mixed in the preliminary mixing mechanism, they flow into the full mixing mechanism under the pressure of the feed pump, and are discharged from the discharge pipe after the mixing is completed, thereby realizing continuous online mixing of the stock solution and the color paste.

[0021] The beneficial effects of the utility model are:

[0022] 1. The online mixing system for polyimide stock solution coloring adopts a preliminary mixing mechanism and a full mixing mechanism to form a multi-stage online dynamic mixing system. The full mixing mechanism includes a horizontally placed 8-shaped mixing tank, a first stirring mechanism and a second stirring mechanism. The speed of the first stirring mechanism is set lower than that of the second stirring mechanism, so that there is no mixing dead angle in the full mixing mechanism; at the same time, the secondary mixed liquid after stirring in the first horizontal tank body gradually enters the second horizontal tank body for further stirring. After three mixing, the polyimide stock solution can be fully mixed with the color paste.

[0023] 2. The stirring mechanism can stir the liquid at different positions in the tank by setting long impellers and short impellers, generate turbulence in the tank and improve the mixing effect.

[0024] 3. The feed pump pumps the stock solution and color paste into the preliminary mixing mechanism. After the stock solution and color paste are mixed in the preliminary mixing mechanism, they flow into the full mixing mechanism under the pressure of the feed pump. After the mixing is completed, they are discharged from the discharge pipe, thereby realizing continuous online mixing of the stock solution and color paste. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a transverse section of the utility model.

[0026] Figure 2 It is a schematic longitudinal section diagram of the utility model.

[0027] In the figure, 1, preliminary mixing mechanism; 101, preliminary mixing tank; 2, sufficient mixing mechanism; 21, 8-shaped mixing tank; 211, first horizontal tank body; 212, second horizontal tank body; 3, feeding pipe; 4, feeding pipe; 5, discharging pipe; 6, stirring mechanism; 61, rotating shaft; 62, driving member; 7, stirring paddle; 71, long impeller; 711, long paddle; 712, first stirring blade; 72, short impeller; 721, short paddle; 722, second stirring blade. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] Example 1

[0030] An online mixing system for coloring polyimide stock solution comprises a preliminary mixing mechanism 1, a sufficient mixing mechanism 2 and a feeding pipe 3. The preliminary mixing mechanism 1 is arranged above the sufficient mixing mechanism 2, and the preliminary mixing mechanism 1 and the sufficient mixing mechanism 2 are connected through the feeding pipe 3. A feeding pipe 4 is arranged above the preliminary mixing mechanism 1, and a feeding pump is arranged on the feeding pipe 4. The feeding pump pumps the color paste of the polyimide stock solution into the preliminary mixing mechanism 1 for preliminary mixing, and then the preliminary mixed liquid enters the sufficient mixing mechanism 2 through the feeding pipe 3.

[0031] The preliminary mixing mechanism 11 includes a preliminary mixing tank 101, and the sufficient mixing mechanism 2 includes a horizontally placed 8-shaped mixing tank 218, which is composed of a first horizontal tank body 211 and a second horizontal tank body 212. The side walls of the first horizontal tank body 211 and the second horizontal tank body 212 are connected, so that the cross section of the sufficient mixing mechanism 2 forms a horizontal 8-shaped shape. The top of the first horizontal tank body 211 is connected to the feeding pipe 3, and the bottom of the second horizontal tank body 212 is provided with a discharge pipe 5. The preliminary mixing tank 101, the first horizontal tank body 211 and the second horizontal tank body 212 are all provided with a stirring mechanism 6, and the rotation speed ratio of the stirring mechanism 6 in the first horizontal tank body 211 to the rotation speed ratio of the stirring mechanism 6 in the second horizontal tank body 212 is 1:3.

[0032] The stirring mechanism 6 includes a rotating shaft 61, a stirring paddle disposed on the rotating shaft 61, and a driving member 62 for driving the rotating shaft 61 to rotate. The driving member 62 is a motor, which is disposed outside the mixing tank. The output shaft of the motor penetrates into the mixing tank and is fixedly connected to the rotating shaft 61. The rotating shaft 61 drives the stirring paddle 7 to rotate in the mixing tank to stir the liquid.

[0033] The polyimide stock solution coloring online mixing system adopts a multi-stage online dynamic mixing tank, including a preliminary mixing mechanism 1 and a sufficient mixing mechanism 2. The polyimide stock solution passes through the stock solution feed valve and the color paste passes through the color paste feed valve in a certain proportion and enters the preliminary mixing mechanism 1. Preliminary mixing and stirring are performed in the preliminary mixing mechanism 1. The preliminary mixed stock solution then enters the sufficient mixing mechanism 2 through the feeding pipe 3. The sufficient mixing mechanism 2 is formed by connecting the side walls of the first horizontal tank body 211 and the second horizontal tank body 212. The preliminary mixed liquid enters the first horizontal tank body 211 along the feeding pipe 4, and then flows into the second horizontal tank body 212. After mixing, it is discharged from the discharge pipe 5 at the bottom of the second horizontal tank body 212.

[0034] The rotation speed of the stirring mechanism 6 in the first horizontal tank body 211 is lower than that of the stirring mechanism 6 in the second horizontal tank body 212. Therefore, the flow rate of the mixed liquid in the second horizontal tank body 212 is greater than that of the first horizontal tank body 211. Therefore, the mixed liquid in the second horizontal tank body 212 can draw the mixed liquid in the first horizontal tank body 211 into the second horizontal tank body 212, so that the mixed liquid in the first horizontal tank body 211 and the second horizontal tank body 212 can be fully exchanged. After the preliminary mixed liquid is further mixed in the first horizontal tank body 211, it enters the second horizontal tank body 212 for final mixing under the action of the stirring mechanism 6.

[0035] By setting the rotation speed of the stirring mechanism 6 in the first horizontal tank body 211 to be lower than that of the stirring mechanism 6 in the second horizontal tank body 212, there is no mixing dead corner in the full mixing mechanism 2; at the same time, the secondary mixed liquid after stirring in the first horizontal tank body 211 gradually enters the second horizontal tank body 212 for further stirring, and the polyimide stock solution after three mixings can be fully mixed with the color paste.

[0036] Example 2

[0037] The stirring paddle includes four long impellers 71 and four short impellers 72. The long impellers 71 and the short impellers 72 are alternately arranged on the rotating shaft 61 along the axial direction of the rotating shaft 61. By arranging the long impellers 71 and the short impellers 72, the liquid in different positions in the tank body can be stirred, turbulence is generated in the tank body, and the mixing effect is improved.

[0038] The long impeller 71 includes four long paddles 711 and a first stirring blade. The four long paddles 711 are evenly fixed on the rotating shaft 61 along the circumferential direction, and two first stirring blades are fixedly connected to the long paddle 711. The short impeller 72 includes four short paddles 721 and a second stirring blade 722. The four short paddles 721 are evenly fixed on the rotating shaft 61 along the circumferential direction, and a second stirring blade 722 is fixedly connected to the short paddle 721. The angle between the first stirring blade and the long paddle 711 is 45°, and the angle between the second stirring blade 722 and the short paddle 721 is 70°. The stirring blades on the long paddle 711 and the short paddle 721 are set at different inclination angles to improve the mixing efficiency.

[0039] The angle between the long paddle 711 and the rotating shaft 616 is greater than 90°, and the angle between the short paddle 721 and the rotating shaft 61 is less than 90°. The angles between the long paddle 711 and the short paddle 721 and the rotating shaft 61 are complementary. When the stirring mechanism 6 rotates, the mixed liquid can be pushed in two opposite directions at the same time, thereby accelerating the mixing of the original liquid and the color paste.

[0040] For matters not mentioned above, the prior art applies.

[0041] Although some specific embodiments of the utility model have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the utility model. Those skilled in the art of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but they will not deviate from the direction of the utility model or exceed the scope defined by the attached claims. Those skilled in the art should understand that any modification, equivalent replacement, improvement, etc. made to the above implementation methods based on the technical essence of the utility model should be included in the protection scope of the utility model.

Claims

1. An online mixing system for polyimide stock solution coloring, characterized by: The invention comprises a preliminary mixing mechanism (1), a full mixing mechanism (2) and a feeding pipe (3), wherein the preliminary mixing mechanism (1) comprises a preliminary mixing tank (101), and the full mixing mechanism (2) comprises a horizontally placed 8-shaped mixing tank (218), wherein the 8-shaped mixing tank (218) is composed of a first horizontal tank body (211) and a second horizontal tank body (212), wherein the side walls of the first horizontal tank body (211) and the second horizontal tank body (212) are connected, the top of the first horizontal tank body (211) is connected to the preliminary mixing tank (101) via a feeding pipe (3), and the bottom of the second horizontal tank body (212) is provided with a discharge pipe (5), and the preliminary mixing tank (101), the first horizontal tank body (211) and the second horizontal tank body (212) are all provided with stirring mechanisms (6), and the rotation speed of the stirring mechanism (6) in the first horizontal tank body (211) is lower than that of the stirring mechanism (6) in the second horizontal tank body (212).

2. The online mixing system for polyimide stock solution coloring according to claim 1, characterized in that: The ratio of the rotation speed of the stirring mechanism (6) in the first horizontal tank body (211) to the rotation speed of the stirring mechanism (6) in the second horizontal tank body (212) is 1:3-4:

5.

3. The online mixing system for polyimide stock solution coloring according to claim 1, characterized in that: The stirring mechanism (6) comprises a rotating shaft (61), a stirring paddle arranged on the rotating shaft (61), and a driving member (62) for driving the rotating shaft (61) to rotate.

4. The online mixing system for polyimide stock solution coloring according to claim 3 is characterized in that: The stirring paddle comprises a plurality of long impellers (71) and a plurality of short impellers (72), wherein the long impellers (71) and the short impellers (72) are alternately arranged on the rotating shaft (61) along the axial direction of the rotating shaft (61).

5. The online mixing system for polyimide stock solution coloring according to claim 4 is characterized in that: The long impeller (71) comprises a plurality of long paddles (711) and a first stirring blade, wherein the plurality of long paddles (711) are evenly fixed on the rotating shaft (61) along a circumferential direction, and the plurality of first stirring blades are fixedly connected to the long paddle (711).

6. The online mixing system for polyimide stock solution coloring according to claim 5, characterized in that: The short impeller (72) comprises a plurality of short paddles (721) and a second stirring blade (722); the plurality of short paddles (721) are evenly fixed on the rotating shaft (61) along a circumferential direction; and the plurality of second stirring blades (722) are fixedly connected to the short paddles (721).

7. The online mixing system for polyimide stock solution coloring according to claim 6, characterized in that: The long paddle (711) and the short paddle (721) are arranged obliquely on the rotating shaft (61), and the angles between the long paddle (711) and the short paddle (721) and the rotating shaft (61) are complementary.

8. The online mixing system for polyimide stock solution coloring according to claim 6, characterized in that: The included angle between the first stirring blade and the long paddle (711) is 45°-75°, and the included angle between the second stirring blade (722) and the short paddle (721) is 50°-70°.

9. The online mixing system for polyimide stock solution coloring according to claim 1, characterized in that: A feed pump and a feed pipe (4) are provided above the preliminary mixing tank (101).

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