Uniform oiling device for carbon fiber precursors

Abstract

The utility model discloses a carbon fiber precursor uniform oiling device and belongs to the technical field of carbon fiber production equipment. Comprising an oil tank, an oil agent distribution structure is arranged on one side of the oil tank, the oil agent distribution structure is located in the oil tank, and a plurality of mesh plates are arranged on one side of the oil agent distribution structure; according to the utility model, the bottom-mounted distribution pipe structure is adopted, and an oil agent is conveyed into the transversely-arranged distribution pipe in a bilateral symmetrical oil inlet manner and uniformly flows out to an oil groove through a precisely-designed oil outlet hole array. The design is based on an ANASY fluid simulation technology, the number, aperture and spacing of oil outlet holes are optimally determined according to input parameters such as total flow of an oil agent and the pipe diameter of a distribution pipe, and it is ensured that the flow deviation of each oil outlet hole is smaller than or equal to 2%, and the distribution uniformity of a flow velocity field reaches 95% or above. The scientific layout not only eliminates the concentration gradient problem generated by a traditional distribution mode, but also can establish a stable concentration gradient field (CV value lt; 3%).

Description

TECHNICAL FIELD

[0001] The utility model belongs to carbon fiber production equipment technical field, specifically relates to a kind of carbon fiber precursor uniform oiling device. BACKGROUND

[0002] Oiling process is a key step in the preparation process of polyacrylonitrile-based carbon fiber precursor, and the oiling process can improve the antistatic property of polyacrylonitrile-based carbon fiber precursor, improve the passability and the stability of the precursor during the preparation process. At the same time, the oiling process can also improve the heat resistance of the precursor fiber, avoid the fiber bundle fusing during the drying and densification and pre-oxidation process, and cause the mechanical property of the fiber to decrease.

[0003] At present, the main methods for carbon fiber precursor oiling device are spraying oiling, immersion oiling, ultrasonic-assisted oiling and circulating pump oiling. Although the existing methods can improve the uniformity of oiling to some extent, there are still the following shortcomings: although the spraying oiling is efficient, it can cause uneven distribution of oiling agent and damage to the fiber bundle, and the oiling agent has poor permeability. High-speed spraying may cause mechanical damage to the fiber bundle, affecting the quality of the precursor; although the immersion oiling can improve the permeability of the oiling agent, the oiling efficiency is low, the oiling agent is wasted seriously, the concentration and temperature of the oiling agent in the oil tank are difficult to control accurately, and the uniformity of oiling is affected; the ultrasonic-assisted oiling is complex to maintain and has high energy consumption, which increases the production cost. UTILITY MODEL CONTENTS

[0004] The utility model mainly solves the technical problems existing in the prior art, and provides a kind of carbon fiber precursor uniform oiling device.

[0005] The above technical problems of the utility model are mainly solved by the following technical scheme: a kind of carbon fiber precursor uniform oiling device, including oil tank, characterized by: the oil tank is provided with oiling agent distribution structure on one side, and the oiling agent distribution structure is located in the inside of oil tank, and multiple mesh plates are arranged on the side of the oiling agent distribution structure, multiple slide rails are arranged on the two sides of the mesh plate in the inside of oil tank, multiple fixed guide rods are arranged above the inside of oil tank, respectively, and the lower part between two adjacent fixed guide rods is provided with press-in guide rod, the oil tank is provided with liquid collecting pan at the end of precursor discharge, the upper part of the liquid collecting pan is provided with discharge roller, the upper part of the discharge roller is provided with oil scraping rod, the upper part of the oil scraping rod is provided with filament separator, and the upper part of the filament separator is provided with press roller device.

[0006] Preferably, the inside of the oil tank is provided with a heat exchanger, and the heat exchanger is located below the multiple fixed guide rods and the press-in guide rod.

[0007] Preferably, the bottom of the liquid collecting pan is provided with a collecting pipe, and the lower part of the collecting pipe is connected with an oiling agent circulating tank.

[0008] As preferred, the oil agent distribution structure comprises a liquid inlet pipe, a liquid collecting pipe, a distribution pipe and a sealing sleeve, the liquid inlet pipe is formed with a first bending part on both sides, the first bending part extends vertically downward for a period and then forms a second bending part, the second bending part extends horizontally for a period and then forms a third bending part, the liquid collecting pipe is sleeved on the surface of the liquid inlet pipe inside the oil tank, the front and back sides of the liquid inlet pipe inside the liquid collecting pipe are both provided with a liquid outlet groove, the liquid collecting pipe is formed with a liquid collecting cavity inside, a plurality of distribution pipes are arranged on the side of the liquid collecting pipe facing the mesh plate, and the sealing sleeve is arranged on both sides of the connection between the liquid inlet pipe and the oil tank.

[0009] The utility model has the beneficial effect that:

[0010] 1. The patent adopts the distribution pipe structure installed at the bottom, which transports the oil agent to the horizontally arranged distribution pipe through the bilateral symmetrical oil inlet mode, and uniformly flows out to the oil tank through the precisely designed oil outlet hole array. Based on the ANASYS fluid simulation technology, according to the input parameters such as the total flow of the oil agent and the pipe diameter of the distribution pipe, the number, the hole diameter and the spacing of the oil outlet hole are optimized and determined, so that the flow deviation of each oil outlet hole is less than or equal to 2%, and the uniformity of the flow velocity field distribution is more than 95%. This scientific layout not only eliminates the concentration gradient problem caused by the traditional distribution mode, but also establishes a stable concentration gradient field (CV value < 3%) in the fiber bundle infiltration area, as shown in the figure. In this way, local concentration abnormalities can be effectively prevented, thereby providing a uniform and stable oil agent distribution environment for subsequent process treatment. Figure 4

[0011] 2. The three-stage progressive mesh plate structure is arranged downstream of the distribution pipe, the flow guide structure with a tapered cross section breaks the large vortex into a micro-scale vortex, and at the same time, the directional guidance of the flow direction can be realized, and the turbulence intensity can be reduced by 60-80%. In addition, the system integrated online flow velocity sensor is arranged, the oil agent flow state in the tank is monitored in real time, and the stability and controllability of the process are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a wiring structure schematic diagram of the utility model;

[0013] Figure 2 is a combination structure schematic diagram of the oil agent distribution structure and the mesh plate of the utility model;

[0014] Figure 3 is a sectional structure schematic diagram of the oil agent distribution structure of the utility model;

[0015] Figure 4 is a diagram of the velocity at each oil outlet of the distribution pipe.

[0016] ​In the diagram: 1. Oil distribution structure; 101. Inlet pipe; 102. First bend; 103. Second bend; 104. Third bend; 105. Outlet trough; 106. Collection pipe; 107. Distribution pipe; 108. Sealing sleeve; 109. Collection chamber; 2. Mesh plate; 21. Slide rail; 3. Heat exchanger; 4. Fixed guide rod; 5. Pressing guide rod; 6. Oil scraper; 7. Fiber separator; 8. Pressure roller device; 9. Collection tray; 10. Oil circulation tank; 11. Collection pipe; 12. Oil trough; 13. Discharge roller. Detailed Implementation

[0017] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0018] Example: A device for uniformly oiling carbon fiber precursors, such as... Figures 1-3 As shown, the system includes an oil tank 12, with an oil distribution structure 1 located on one side of the oil tank 12. Multiple perforated plates 2 are arranged on one side of the oil distribution structure 1. Multiple slide rails 21 are arranged inside the oil tank 12 corresponding to the two sides of the perforated plates 2. Multiple fixed guide rods 4 are respectively arranged above the inside of the oil tank 12. A pressing guide rod 5 is arranged below two adjacent fixed guide rods 4. A heat exchanger 3 is arranged inside the oil tank 12, located between the multiple fixed guide rods 4 and the pressing guide rod 5. Below the guide rod 5, an oil trough 12 is located at the raw yarn discharge end and a liquid collection plate 9 is provided. Above the liquid collection plate 9 is a discharge roller 13, above the discharge roller 13 is an oil scraper 6, above the oil scraper 6 is a yarn separator 7, and above the yarn separator 7 is a pressure roller device 8. At the bottom of the liquid collection plate 9 is a collection pipe 11, and below the collection pipe 11 is an oil circulation tank 10. After the yarn bundle is oiled by passing through the oil trough 12, it enters the oil scraping device through the discharge roller 13, which includes the oil scraper 6 and the yarn separator 7. The oil scraper 6 is used to initially scrape the oil from the surface of the yarn bundle, and the scraped waste oil is collected through the liquid collection plate 9 and flows into the oil circulation tank 10.

[0019] The oil distribution structure 1 includes an inlet pipe 101, a collecting pipe 106, a distribution pipe 107, and a sealing sleeve 108. The inlet pipe 101 has a first bend 102 on each side. The first bend 102 extends vertically downward to form a second bend 103. The second bend 103 extends laterally to form a third bend 104. The collecting pipe 106 is sleeved on the surface of the inlet pipe 101 located inside the oil tank 12. The inlet pipe 101 located on the inner surface of the collecting pipe 106 has an outlet groove 105 on both the front and rear sides. The collecting pipe 106 has a collecting cavity 109 inside. Multiple distribution pipes 107 are arranged on the side of the collecting pipe 106 facing the perforated plate 2. The sealing sleeve 108 is arranged on both sides of the connection between the inlet pipe 101 and the oil tank 12.

[0020] For the mesh plate 2, the opening ratio (β) is a key parameter affecting the flow stability, and the flow performance of the oil agent can be significantly improved by optimizing the opening ratio. The opening ratio is determined by the hole diameter (d), the hole distance (p) and the hole arrangement mode (such as square, triangle), so these parameters need to be comprehensively regulated to achieve the best flow stability. Based on the fluid mechanics simulation, by comparing the flow characteristics (such as flow velocity distribution, vortex area, pressure drop coefficient, etc.) under different β conditions, combined with the visual analysis of the velocity cloud chart and the turbulent kinetic energy distribution, the optimization range of the opening ratio can be determined, so as to balance the flow efficiency and stability. As shown in the following chart, after the mesh plate 2 is set, the vortex generated by the jet flow is reduced by 60% in the integral scale after passing through the mesh plate 2, and the large vortex is basically broken into small vortex, so that the turbulent intensity is reduced from 18.5% to less than 5%.

[0021]

[0022] Finally, it should be pointed out that the above embodiments are only more representative examples of the present application. Obviously, the present application is not limited to the above embodiments, and many variations can also be made. Any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments shall be considered to fall within the protection scope of the present application.

Claims

1. A device for uniformly oiling carbon fiber precursors, comprising an oil tank (12), characterized in that: An oil distribution structure (1) is provided on one side of the oil tank (12). The oil distribution structure (1) is located inside the oil tank (12). Multiple perforated plates (2) are provided on one side of the oil distribution structure (1). Multiple slide rails (21) are provided on both sides of the perforated plates (2) inside the oil tank (12). Multiple fixed guide rods (4) are provided on the upper part of the oil tank (12). A pressing guide rod (5) is provided below two adjacent fixed guide rods (4). A liquid collection plate (9) is provided at the end of the oil tank (12) where the raw yarn is discharged. A discharge roller (13) is provided above the liquid collection plate (9). An oil scraper (6) is provided above the discharge roller (13). A yarn separator (7) is provided above the oil scraper (6). A pressure roller device (8) is provided above the yarn separator (7).

2. The carbon fiber precursor uniform oiling device according to claim 1, characterized in that: The oil tank (12) is equipped with a heat exchanger (3), which is located below a plurality of fixed guide rods (4) and a press-in guide rod (5).

3. The carbon fiber precursor uniform oiling device according to claim 1, characterized in that: The bottom of the liquid collection tray (9) is provided with a collection pipe (11), and the oil circulation tank (10) is connected to the bottom of the collection pipe (11).

4. The carbon fiber precursor uniform oiling device according to claim 1, characterized in that: The oil distribution structure (1) includes an inlet pipe (101), a collecting pipe (106), a distribution pipe (107), and a sealing sleeve (108). The inlet pipe (101) has first bends (102) on both sides. The first bends (102) extend vertically downwards to form a second bend (103), and the second bends (103) extend laterally to form a third bend (104). The collecting pipe (106) is sleeved on... The inlet pipe (101) is located on the inner surface of the oil tank (12). The inlet pipe (101) located on the inner surface of the collecting pipe (106) has an outlet groove (105) on both the front and rear sides. The collecting pipe (106) forms a collecting chamber (109) inside. Multiple distribution pipes (107) are arranged on the side of the collecting pipe (106) facing the mesh plate (2). The sealing sleeve (108) is arranged on both sides of the connection between the inlet pipe (101) and the oil tank (12).

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