Air draft filament collecting cavity for preparing pitch-based carbon fiber felt by spinning method

Abstract

The utility model relates to an air draft and filament collection cavity for preparing asphalt-based carbon fiber felt by a filament spraying method. The air draft and filament collection cavity comprises a filament collection cavity body, and an adjustable louvered air outlet window, an upper-layer air distribution plate, an upper-layer air uniformizing structure, a lower-layer air distribution plate, an air scoop assembly and a lower-layer air distribution and distribution chamber which are sequentially arranged in the filament collection cavity body from top to bottom, according to the utility model, a multi-layer homogenizing air distribution structure is adopted, so that the uniform air quantity in a set yarn collecting range is ensured, the finally formed pitch-based carbon fiber felt is uniform in thickness, and the yarn collecting quality of spinning pitch is improved; an automatic adjusting mode is adopted, and accurate control over the air volume is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the production technical field of asphalt based carbon fiber felt, especially to a suction silo silk cavity used when preparing asphalt based carbon fiber felt by the spinning method. BACKGROUND

[0002] At present, the asphalt based carbon fiber felt prepared by the spinning method has realized industrialized production, and its principle is that the molten pitch sprayed from the nozzle of the spraying device forms asphalt based carbon fiber under the impact of the jet airflow, and the sprayed asphalt based carbon fiber silk is deposited on the conveying net chain below through the air suction device to form asphalt based carbon fiber felt with a certain thickness.

[0003] The Chinese utility model patent with the authorized announcement number CN 202989480 U discloses a production device of carbon fiber, specifically a production device of asphalt based carbon fiber felt prepared by the melt blowing method. It comprises a feeding device, a hopper, a belt conveyor, a double screw extruder, a booster pump, a filtering device, a spinning nozzle, a spinning plate, a spinning chamber, a hot air drafting device, a receiving device and a conveying track. The spinning pitch is melted and extruded by the screw, accurately conveyed by the gear pump, sprayed out of the spinning nozzle through the spinning plate, and then drafted by the hot air in the spinning chamber. The asphalt fiber is received by the double rollers, and the asphalt felt formed is constrained by the reinforcing mesh cloth on the upper and lower surfaces. There is an air suction device below the conveying belt during the formation of the felt, which sucks the asphalt felt and the reinforcing mesh cloth on the upper and lower surfaces together to make the mesh cloth play a better constraining role. Then, the felt is transported to the continuous mesh belt non-melting furnace and the continuous mesh belt carbonization furnace through the conveying track to prepare the asphalt carbon fiber.

[0004] The main function of the silk collecting cavity with the air suction device is to uniformly lay the spinning pitch on the conveying net chain above the silk collecting cavity and make the spinning pitch have a uniform thickness to improve the silk collecting quality. The structural design and air volume distribution control of the silk collecting cavity are the key factors affecting the silk collecting quality of the spinning pitch. The conventional silk collecting cavity of the spinning pitch is a rectangular iron tank with an open top. The silk collecting fan is connected to the rectangular iron tank below the conveying net chain through the air pipe, and the control of the air volume is realized by the plug plate arranged on the air pipe, but it is impossible to realize the uniform distribution of the air volume in the silk collecting range.

[0005] A melt-blowing device is disclosed in Chinese patent application CN1440840A, which has a filament-discharging nozzle, and a continuously movable deposition screen curtain is arranged below the nozzle for extracting the melt-blown product filaments to be deposited on the deposition screen curtain. A suction device is also arranged at the deposition screen curtain for sucking air through the deposition screen curtain. Along its longitudinal direction, the deposition screen curtain is provided with a plurality of suction areas separated from each other. One of the suction areas is a main suction area located at the deposition area. The suction speed in the suction areas can be adjusted independently of each other. However, in the melt-blowing device, each suction area has a respective suction fan, which not only has a complex structure, but also is difficult to control, and it is difficult to achieve satisfactory results.

[0006] The uniformity of the air volume distribution during the filament collection is a key factor to determine whether the thickness of the asphalt-based carbon fiber felt after forming is uniform, and therefore, a filament collection chamber with air suction function and capable of uniformly distributing air volume as much as possible is needed; in addition, the existing filament collection chambers mostly rely on manual air volume adjustment, have low automation degree, are easy to be blocked after long time use, and are not easy to clean and maintain, which directly affects the normal operation and service life of the device. SUMMARY

[0007] The utility model provides a kind of air suction filament collection chamber for asphalt-based carbon fiber felt preparation by spinning method, adopt multiple layers of homogenization air distribution structure, ensure that the air volume in the set filament collection range is uniform, asphalt-based carbon fiber felt after final forming is uniform in thickness, improve the filament collection quality of spinning asphalt;Adopt automatic adjustment mode, realize the accurate control of air volume.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] An air suction filament collection chamber for asphalt-based carbon fiber felt preparation by spinning method, comprising a filament collection chamber body and, in the filament collection chamber body, from top to bottom, an adjustable louvered air outlet window, an upper air distribution plate, an upper air uniformization structure, a lower air distribution plate, a wind scoop assembly and a lower air distribution chamber; the filament collection chamber body is divided into a plurality of air suction areas along the longitudinal direction; a filament collection fan mounting port for mounting a filament collection fan is provided on one side of the lower air distribution chamber corresponding to each air suction area, and the filament collection fan is an air suction fan; a plurality of primary air outlets are uniformly provided on the top of the lower air distribution chamber corresponding to each air suction area, and the filament collection fan mounting port is connected to a corresponding primary air outlet through a closed chamber; the wind scoop assembly is composed of a plurality of wind scoops corresponding to the primary air outlets one by one; a plurality of secondary air outlets are uniformly provided in the lower air distribution plate corresponding to each wind scoop; the upper air uniformization structure is a grid structure, which separates the secondary air outlets corresponding to each wind scoop; and a plurality of tertiary air outlets are provided in the upper air distribution plate corresponding to each adjustable air outlet of the adjustable louvered air outlet window.

[0010] The adjustable louver air outlet window is composed of an adjusting cylinder, a connecting rod and a plurality of louvered wind baffles; the cylinder body of the adjusting cylinder is fixed to one end of the yarn collecting cavity body, and the push rod of the adjusting cylinder is connected with each louvered wind baffle through the connecting rod; each louvered wind baffle swings synchronously under the action of the adjusting cylinder to form a plurality of adjustable air outlets.

[0011] The yarn collecting cavity body is longitudinally divided into two air extraction areas, two yarn collecting fan installation openings are arranged correspondingly, and two yarn collecting fans are installed.

[0012] Four primary air outlets are symmetrically arranged at the top of the lower air distribution chamber corresponding to one air extraction area, a partition plate is arranged in the closed chamber and along the axis direction of the yarn collecting fan, the closed chamber is divided into two symmetrical chambers by the partition plate, and each chamber is communicated with two primary air outlets on the same side.

[0013] The air funnel has a four-pyramid structure with a large upper opening and a small lower opening.

[0014] Four secondary air outlets are symmetrically arranged above each air funnel.

[0015] The upper air distribution structure is composed of a lower grid and an upper framework, the lower grid is in a grid structure and separates the secondary air outlets; the upper framework is in a fishbone structure and is arranged along the separation line of the primary air outlet; the longitudinal framework in the upper framework is spaced apart from the upper air distribution plate, and the top surface of the transverse framework in the upper framework is tightly attached to the bottom surface of the upper air distribution plate.

[0016] The yarn collecting cavity body is provided with a plurality of yarn collecting cavity cleaning openings on the side opposite to the yarn collecting fan installation opening, the yarn collecting cavity cleaning openings are communicated with the closed chamber and can be closed by pulling the temporary sealing plate.

[0017] The yarn collecting fan is a variable frequency fan.

[0018] The upper part of the yarn collecting cavity body is provided with an air volume measuring instrument, a pressure regulator is arranged on the air path of the adjusting cylinder, and the air volume measuring instrument, the pressure regulator and the yarn collecting fan are interlocked and controlled through a control system.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] 1) The set yarn collecting range is divided into a plurality of air extraction areas, and a multi-layer uniform air distribution structure (including an adjustable louver air outlet window, an upper air distribution plate, an upper air distribution structure, a lower air distribution plate, an air funnel assembly and a lower air distribution chamber) is adopted, so that the air volume in the effective yarn collecting range is uniform, the thickness of the finally formed asphalt-based carbon fiber felt is uniform, and the yarn collecting quality of the spinning asphalt is improved.

[0021] 2) Adopt intelligent automatic adjustment mode, utilize control system to realize interlock control, by wind volume measuring instrument real-time monitoring wind volume, through pressure regulator control adjustment cylinder, simultaneously through frequency converter adjustment silk collecting fan's output wind volume, finally realize to silk collecting area wind volume's accurate control, compared with manual adjustment mode, reduce personnel labor intensity, improve work efficiency;

[0022] 3) The structure of the uniform air distribution structure of each layer is simple, reasonable in design, low in manufacturing cost and good in implementation effect;

[0023] 4) The silk collecting cavity cleaning port is arranged, so that the air suction silk collecting cavity can be cleaned in time, the service life and working reliability of the device are prolonged, the probability of blockage failure during use of the device is low, and the maintenance cost is low;

[0024] 5) The silk collecting fan adopts a frequency conversion fan, and the air volume is convenient to adjust. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic view of the three-dimensional structure of the air suction silk collecting cavity of the utility model. Figure 1 (the adjustable louver type air outlet window closing state).

[0026] Figure 2 is a schematic view of the three-dimensional structure of the air suction silk collecting cavity of the utility model. Figure 2 (the adjustable louver type air outlet window opening state).

[0027] Figure 3 is a sectional view of the air suction silk collecting cavity of the utility model.

[0028] Figure 4 is the A-A sectional view in Figure 3 .

[0029] Figure 5 is the B-B sectional view in Figure 3 .

[0030] Figure 6 is the C-C sectional view in Figure 3 .

[0031] Figure 7 is the D-D sectional view in Figure 3 .

[0032] Figure 8 is the E-E sectional view in Figure 3 .

[0033] Figure 9 is a schematic view of the three-dimensional structure of the adjustable louver type air outlet window of the utility model.

[0034] Figure 10 is a schematic view of the three-dimensional structure of the upper air distribution plate of the utility model.

[0035] Figure 11 is the three-dimensional structure schematic diagram of the upper layer air distribution structure.

[0036] Figure 12 is the three-dimensional structure schematic diagram of the lower layer air distribution plate.

[0037] Figure 13 is the combined structure schematic diagram of the upper layer air distribution plate, the upper layer air distribution structure and the lower layer air distribution plate.

[0038] Figure 14 is the three-dimensional structure schematic diagram of the air distribution assembly.

[0039] Figure 15 is the three-dimensional structure schematic diagram of the lower layer air distribution distribution chamber.

[0040] In the figure: 1. The filament collection cavity body 2. The adjusting cylinder 3. The louvered air baffle 4. The filament collection fan mounting port 5. The filament collection cavity cleaning port 6. The upper layer air distribution plate 61. The tertiary air port 7. The upper layer air distribution structure 8. The lower layer air distribution plate 81. The secondary air port 9. The air distribution assembly 10. The chamber 11. The primary air port 12. The partition DETAILED DESCRIPTION

[0041] The specific embodiments of the utility model will be further described below in combination with the drawings:

[0042] Figures 1-8 As shown in the figure, the utility model discloses a kind of air extraction filament collection cavities for preparing pitch-based carbon fiber felt by spinning method, including filament collection cavity body 1 and in filament collection cavity body 1 From top to bottom, adjustable louvered air outlet is set, upper layer air distribution plate 6, upper layer air distribution structure 7, lower layer air distribution plate 8, air distribution assembly and lower layer air distribution distribution chamber;The filament collection cavity body 1 is divided into several air extraction regions along longitudinal direction;The lower layer air distribution distribution chamber of corresponding each air extraction region 1 side is equipped with filament collection fan mounting port 4 for installing filament collection fan, and filament collection fan is air extraction machine;The top of the lower layer air distribution distribution chamber of corresponding each air extraction region is equipped with several primary air ports 11 evenly, and filament collection fan mounting port 4 is communicated with corresponding primary air port 11 by closed chamber;The air distribution assembly is composed of several air distribution 9 corresponding to primary air port 11 one by one;Lower layer air distribution plate 8 is evenly provided with several secondary air ports 81 corresponding to each air distribution 9;Upper layer air distribution structure 7 is grid type structure, and corresponding secondary air port 81 of each air distribution 9 is separated (the combined structure of upper layer air distribution plate, upper layer air distribution structure and lower layer air distribution plate, as shown in the figure);Upper layer air distribution plate 6 is correspondingly provided with tertiary air port 61 (as shown in the figure) at each adjustable air port corresponding to adjustable louvered air outlet. Figure 13 Figure 10

[0043] ​​As Figure 9 shown, the adjustable louver air outlet window is composed of adjusting cylinder 2, connecting rod and a plurality of louvered baffle 3; the cylinder body of adjusting cylinder 2 is fixed to one end of the yarn collecting cavity body 1, the push rod of adjusting cylinder 2 is connected to each louvered baffle 3 through connecting rod; under the action of adjusting cylinder 2, each louvered baffle 3 swings synchronously to form a plurality of adjustable air ports.

[0044] The yarn collecting cavity body 1 is divided into two air extraction areas along the longitudinal direction, two yarn collecting fan mounting ports 4 are arranged correspondingly, and two yarn collecting fans are mounted.

[0045] As Figure 15 shown, four primary air ports 11 are arranged symmetrically on the top of the lower air distribution chamber corresponding to one air extraction area, a partition plate 12 is arranged in the closed chamber along the axis direction of the yarn collecting fan, the closed chamber is divided into two symmetrical chambers 10, and each chamber 10 is communicated with two primary air ports 11 on the same side.

[0046] As Figure 14 shown, the air funnel 9 is a four-prism frustum structure with large upper opening and small lower opening.

[0047] As Figure 12 shown, the lower air distribution plate 8 is symmetrically provided with four secondary air ports 81 above each air funnel 9.

[0048] As Figure 11 shown, the upper air distribution structure 7 is composed of a lower grid and an upper framework, the lower grid is arranged in a grid shape to separate the secondary air ports 81; the upper framework is a fishbone structure arranged along the separation line of the primary air port 11; the longitudinal framework in the upper framework is spaced apart from the upper air distribution plate 6, and the top surface of the transverse framework in the upper framework is tightly attached to the bottom surface of the upper air distribution plate 6.

[0049] As Figure 1 shown, the yarn collecting cavity body 1 is provided with a plurality of yarn collecting cavity cleaning ports 5 on the side opposite to the yarn collecting fan mounting port 4, the yarn collecting cavity cleaning port 5 is communicated with the closed chamber and can be closed by pulling the temporary sealing plate.

[0050] The yarn collecting fan is a variable frequency fan.

[0051] The upper part of the yarn collecting cavity body 1 is provided with an air volume measuring instrument, a pressure regulator is arranged on the gas path of the adjusting cylinder 2, and the air volume measuring instrument, the pressure regulator and the yarn collecting fan are interlocked controlled through a control system.

[0052] Compared with the conventional device, the air extraction yarn collecting cavity for preparing pitch-based carbon fiber felt by the spinning method has the following advantages:

[0053] 1. The wind volume is uniformly distributed by structure optimization: the adjustable louver type air outlet window at the top of the suction silk collecting cavity can adjust the opening of the adjustable air outlet according to actual needs; the body 1 of the silk collecting cavity is divided into five layers from top to bottom, namely the upper air distribution plate 6, the upper air distribution structure 7, the lower air distribution plate 8, the air funnel assembly and the lower air distribution distribution chamber, the design of the multi-layer air distribution structure can make the negative pressure of the silk collecting fan uniformly transmitted from bottom to top through the silk collecting cavity body 1 to the conveying net chain, thereby improving the thickness uniformity and surface quality of the pitch-based carbon fiber felt obtained after spinning.

[0054] 2. The design is convenient to clean: the silk collecting cavity body 1 is provided with a silk collecting cavity cleaning port 5, which facilitates the cleaning of the silk collecting cavity body 1, reduces the cleaning difficulty and maintenance cost; at the same time, the suction silk collecting cavity is placed below the conveying net chain, which can use the suction process to suck dust into the suction silk collecting cavity, thereby further improving the product quality.

[0055] 3. It is beneficial to realize intelligent control: according to the wind volume measured by the wind volume measuring instrument, the automatic control of the wind volume at the adjustable air outlet is realized through the pressure regulator control adjusting cylinder 2, and the wind volume can also be adjusted in real time through the frequency conversion silk collecting fan.

[0056] The working principle of the suction silk collecting cavity used in the process of preparing pitch-based carbon fiber felt by the spinning method is as follows: the suction silk collecting cavity is fixed below the conveying net chain, the silk collecting fan is installed at the silk collecting fan installation port 4, the initial wind volume is set according to the specification and quality requirement of the pitch-based carbon fiber felt, the silk collecting fan is started after spinning, the wind volume data of the silk collecting area is monitored by using the wind volume measuring instrument, the control system controls the pressure regulating valve according to the wind volume data interlocking, the cylinder rod of the adjusting cylinder 2 makes corresponding extension and contraction action, thereby controlling the opening of the adjustable air outlet, realizing accurate control of the wind volume; the negative pressure generated by the silk collecting fan is sequentially transmitted to the conveying net chain through the lower air distribution distribution chamber, the air funnel assembly, the lower air distribution plate 8, the upper air distribution structure 7 and the upper air distribution plate 6 from bottom to top, and then uniformly transmitted to the conveying net chain through each adjustable air outlet of the adjustable louver type air outlet window, so that the pitch spinning is uniformly adsorbed on the conveying net chain, and the pitch-based carbon fiber felt with uniform thickness is obtained. The inside of the suction silk collecting cavity is cleaned regularly through the silk collecting cavity cleaning port 5, so as to ensure the normal operation of the device and the stability of the suction process.

[0057] The following examples are implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0058]

Example

[0059] As Figures 1-15As shown, in this embodiment, the air extraction filament chamber used for preparing pitch-based carbon fiber felt by the spinning method includes an air extraction filament chamber body 1 and, from top to bottom in the air extraction filament chamber body 1, an adjustable louvered air outlet window, an upper air distribution plate 6, an upper air uniformization structure 7, a lower air distribution plate 8, a wind scoop assembly and a lower air distribution distribution chamber, which are a flat multi-layer structure. The upper air distribution plate 6, the upper air uniformization structure 7, the lower air distribution plate 8, the wind scoop assembly and the lower air distribution distribution chamber divide the air extraction filament chamber body 1 into multiple air distribution chambers, so as to realize uniform distribution of air volume.

[0060] In this embodiment, the air extraction filament chamber body 1 is divided into two air extraction areas along the longitudinal direction. Two air extraction fan installation openings 4 are arranged on one side of the lower air distribution distribution chamber corresponding to the two air extraction areas, for installing air extraction fans, and the air extraction fans are air extraction machines (variable frequency fans). Eight primary air outlets 11 are evenly arranged on the top of the lower air distribution distribution chamber corresponding to the two air extraction areas, and the air extraction fan installation openings 4 are connected to the corresponding primary air outlets 11 through closed chambers. A partition plate 12 is arranged in the closed chamber along the axis direction of the air extraction fan, so as to divide the closed chamber into two symmetrical chambers 10, and each chamber 10 is connected to two primary air outlets 11 on the same side. The wind scoop assembly is composed of eight wind scoops 9 corresponding to the primary air outlets 11. The wind scoops 9 are four-pyramid table structures with large upper openings and small lower openings. The lower air distribution plate 6 is provided with four secondary air outlets 81 corresponding to each wind scoop 9. The upper air uniformization structure 7 is a grid structure, which separates the secondary air outlets 81 corresponding to each wind scoop 9. The upper air distribution plate 6 is provided with a long strip-shaped tertiary air outlet 61 corresponding to each adjustable air outlet of the adjustable louvered air outlet window.

[0061] In this embodiment, the louvered baffle of the adjustable louvered air outlet window is controlled by an adjusting cylinder 2, and an adjusting valve is arranged on the air path of the adjusting cylinder 2. A pressure regulating valve controls the extension amount of the cylinder rod of the adjusting cylinder 2, drives the louvered baffle 3 through a connecting rod, and adjusts the opening degree of each adjustable air outlet.

[0062] In this embodiment, four air extraction chamber cleaning openings 5 are arranged on the side of the air extraction filament chamber body 1 opposite to the air extraction fan installation openings 4, the air extraction chamber cleaning openings 5 are connected to the closed chambers and are closed through a pull-out type temporary sealing plate. The air extraction chamber cleaning openings 5 are used for cleaning and maintaining the air extraction filament chamber, which is beneficial to the normal operation of the device and prolongs the service life.

[0063] In this embodiment, the air extraction filament chamber body 1 is a frame structure, which is made of a 3mm-thick carbon steel plate. The upper air distribution plate 6, the upper air uniformization structure 7, the lower air distribution plate 8, the wind scoop assembly and the lower air distribution distribution chamber are all made of 2mm-thick carbon steel plates. The air extraction filament chamber is installed below the conveying net chain when in use.

[0064] In this embodiment, the fixed stroke of the adjusting cylinder 2 is 200mm, and the output pressure is 0.5MPa.

[0065] In operation, the yarn collecting fan is started, and the air volume is evenly distributed through the upper air distribution plate 6, the upper air distribution structure 7, the lower air distribution plate 8, the air funnel assembly and the lower air distribution chamber, and the opening of each adjustable air outlet in the adjustable louvered air outlet window is adjusted, so that the air volume of the yarn collecting area on the conveying net chain is appropriate and balanced, and thus the asphalt-based carbon fiber felt with uniform thickness is obtained after the asphalt is spun.

[0066] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art, according to the technical scheme and concept of the present application, can make equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A suction spinning chamber for use in the production of pitch-based carbon fiber mats by a spinning process, characterized in that The device comprises a silk collecting cavity body, an adjustable louver air outlet window, an upper layer air distribution plate, an upper layer air uniformizing structure, a lower layer air distribution plate, a wind scoop assembly and a lower layer air distribution chamber arranged in the silk collecting cavity body in sequence from top to bottom; the silk collecting cavity body is divided into several air extraction areas along the longitudinal direction; a silk collecting fan mounting port is arranged on one side of the lower layer air distribution chamber corresponding to each air extraction area for mounting a silk collecting fan, and the silk collecting fan is an air extractor; a plurality of primary air outlets are uniformly arranged on the top of the lower layer air distribution chamber corresponding to each air extraction area, and the silk collecting fan mounting port is connected to a corresponding primary air outlet through a closed chamber; the wind scoop assembly is composed of a plurality of wind scoops corresponding to the primary air outlets one by one; the lower layer air distribution plate is uniformly provided with a plurality of secondary air outlets corresponding to each wind scoop; the upper layer air uniformizing structure is a grid structure, and separates the secondary air outlets corresponding to each wind scoop; and the upper layer air distribution plate is provided with tertiary air outlets corresponding to the adjustable louver air outlet window at each adjustable air outlet.

2. A suction spinning chamber for use in the production of pitch-based carbon fiber mats by a spinning process according to claim 1, characterized in that The adjustable louver air outlet window is composed of an adjusting cylinder, a connecting rod and a plurality of louvered air baffles; the cylinder body of the adjusting cylinder is fixed to one end of the silk collecting cavity body, and the push rod of the adjusting cylinder is connected to each louvered air baffle through the connecting rod; and each louvered air baffle swings synchronously under the action of the adjusting cylinder to form a plurality of adjustable air outlets.

3. A suction spinning chamber for use in the production of pitch-based carbon fiber mats by a spinning process according to claim 1, characterized in that The silk collecting cavity body is divided into two air extraction areas along the longitudinal direction, and two silk collecting fan mounting ports are arranged correspondingly to mount two silk collecting fans.

4. A suction spinning chamber for use in the production of pitch-based carbon fiber mats by a spinning process according to claim 1, characterized in that Four primary air outlets are symmetrically arranged on the top of the lower layer air distribution chamber corresponding to one air extraction area, and a partition plate is arranged in the closed chamber to divide the closed chamber into two symmetrical chambers along the axis direction of the silk collecting fan, and each chamber is connected to two primary air outlets on the same side.

5. A suction spinning chamber for use in the production of pitch-based carbon fiber mats by a spinning process according to claim 1, characterized in that The wind scoop has a four-prism-tapered structure with a large upper opening and a small lower opening.

6. A suction bushing for use in a process for the production of pitch-based carbon fiber mat according to claim 1, wherein The lower layer air distribution plate is symmetrically provided with four secondary air outlets above each wind scoop.

7. A suction spinning chamber for use in the production of pitch-based carbon fiber mats by a spinning process according to claim 1, characterized in that The upper layer air uniformizing structure is composed of a lower layer grid and an upper layer framework, the lower layer grid is a grid structure to separate the secondary air outlets, the upper layer framework has a fishbone structure and is arranged along the separation line of the primary air outlets, the longitudinal framework in the upper layer framework is spaced apart from the upper layer air distribution plate, and the top surface of the transverse framework in the upper layer framework is tightly attached to the bottom surface of the upper layer air distribution plate.

8. A suction spinning chamber for use in the production of pitch-based carbon fiber mats by a spinning process according to claim 1, characterized in that The silk collecting cavity body is provided with a plurality of silk collecting cavity cleaning ports on the side opposite to the silk collecting fan mounting port, the silk collecting cavity cleaning ports are connected to the closed chamber and can be closed by pulling a temporary sealing plate.

9. A suction spinning chamber for use in the process of claim 1 for the production of pitch-based carbon fiber mat, characterized in that, The silk collecting fan is a variable frequency fan.

10. A suction bushing for use in a process for the production of pitch-based carbon fiber mat according to claim 1, wherein A wind volume measuring instrument is arranged above the silk collecting cavity body, a pressure regulator is arranged on the air path of the adjusting cylinder, and the wind volume measuring instrument, the pressure regulator and the silk collecting fan are interlocked and controlled by a control system.

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