Nylon spinning monomer suction device

Abstract

The utility model relates to a nylon spinning monomer suction device, and belongs to the technical field of nylon spinning. Comprising a spinning box, a suction hood and a ventilation main pipe, the suction hood is composed of a suction hood upper shell and a suction hood lower shell, butterfly bolts are arranged on the suction hood upper shell, the suction hood is connected with the ventilation main pipe through a ventilation branch pipe, and a wind direction baffle and a flow guide plate are arranged on the inner side of the suction hood. The steam pipe is fixed to the top end of the ventilation main pipe through a flange and a fixing bolt, a negative pressure measuring connector is arranged on the side portion of the ventilation main pipe, and an air valve is arranged in the ventilation main pipe below the negative pressure measuring connector and comprises an air valve body and an air valve driving motor. The utility model aims to provide the nylon spinning monomer suction device which is uniform in suction force, high in efficiency, long in cleaning period, simple and efficient in cleaning and wide in production application range.

Description

Technical Field

[0001] The utility model relates to the technical field of nylon spinning, in particular to a nylon spinning monomer suction device. Background Art

[0002] The fiber spinning process is to eject the molten polymer through the spinneret, and quickly stretch it, cool it and form it into a primary fiber. In the spinning process of nylon 6 (polyamide 6), due to the characteristics of polyamide itself, low molecular weight polymers and monomers in polyamide will precipitate in the molten state. These oligomers and monomers volatilize after the melt is extruded from the spinneret, forming smoke around the spinneret, and forming white powder after cooling and adhering to the spinneret surface. If the volatilized monomers and low molecular polymers are not cleaned in time, they will contaminate the surface of the spinneret, shorten the service life of the spinneret, affect the quality of spinning, and cause breakage, decreased fiber strength, increased unevenness of the yarn, poor dyeing performance, etc. Therefore, a monomer suction hood is installed on the top of each spinning position window. The suction chamber of the existing conventional spinning suction device is flat, and has the following disadvantages: the suction wind force is uneven in the circumference, and the fiber shaking affects the quality; only part of the volatiles are sucked away, and a small part condenses and adheres to block the pipeline, causing the suction force to gradually decrease, and the monomer cannot be completely sucked out, increasing the frequency of plate cleaning, resulting in increased production consumption; the device is sealed and difficult to clean, and the production range of nylon fibers of different specifications and varieties is small.

[0003] CN218026483U discloses a spinning monomer suction device, including a suction pipe, a suction nozzle and a spoiler are arranged at both ends of the suction pipe, a positioning plate is arranged on the side of the suction pipe surface close to the suction nozzle, and the suction nozzle is arranged toward the spinneret, so that the suction nozzle extends toward the yarn chamber and is closer to the spinneret, so as to achieve uniform suction; the cross-sectional area of ​​the suction nozzle from the end away from the suction pipe to the end close to the suction pipe increases, the suction port area is reduced, the suction force is increased, the monomer can be completely sucked out and the spinneret will not accumulate monomers, the production stability is improved, and the production consumption is reduced; a spoiler is arranged in the suction nozzle to reduce the resistance of air entering the suction nozzle, ensure that the monomer can be completely sucked out, and extend the cleaning cycle of the suction pipe. However, there are problems such as not being applicable to the production of nylon fibers of different specifications and varieties, a small production range, sealing of the device, and difficulty in cleaning.

[0004] CN209537367U discloses a low-melting-point polyamide 6 spinning monomer suction device, which includes a plurality of water jet pumps, a plurality of first valves, a second valve and a monomer suction water tank, so as to realize single-line control of each water jet pump and reduce cleaning costs. However, there is a problem that the monomer condensation in the suction hood is not effectively prevented.

[0005] Therefore, it is a problem that needs to be solved at present to find a nylon spinning monomer suction device with uniform suction, high efficiency, long cleaning cycle, simple and efficient cleaning of the suction device, and a wide range of production applications. Summary of the invention

[0006] The utility model aims to provide a nylon spinning monomer suction device with uniform suction force, high efficiency, long cleaning cycle, simple and efficient cleaning of the suction device and wide production application range.

[0007] The above technical problems are solved by the following technical solutions, including a spinning box, a suction hood connected to the spinning box and a ventilation main pipe, the suction hood is connected to the ventilation main pipe through a ventilation branch pipe, a wind direction baffle and a guide plate are arranged inside the suction hood, the suction is stable and uniform in the circumferential direction, and will not cause large fluctuations in the nascent spinning, the suction hood is tilted downward at one end close to the ventilation branch pipe, which can reduce the accumulation of monomers and oligomers in the suction hood and extend the cleaning cycle of the suction hood. A steam pipe is arranged on the top of the ventilation main pipe to facilitate the cleaning of accumulated blockages in the ventilation pipe, and an air valve is arranged at the lower end. The air valve device can adjust different air volume outputs according to actual production needs, and is suitable for the production of nylon fibers of different specifications and varieties, thereby expanding the scope of application.

[0008] Preferably, one end of the suction hood is a suction port, which is arranged toward the spinning box. The suction hood is composed of an upper shell of the suction hood and a lower shell of the suction hood. Bolts are arranged on the upper shell of the suction hood, and the upper shell of the suction hood is fixed to the spinning box by welding. The lower shell of the suction hood is a detachable movable plate, which is fixed to the upper shell of the suction hood by bolts. The lower shell of the suction hood is detachable, and it is simple, convenient and efficient to disassemble and clean the monomers and oligomers on the inner wall of the suction device, thereby improving work efficiency and reducing labor costs.

[0009] Preferably, the bolts arranged on the upper shell of the suction hood are butterfly bolts, and the butterfly bolts are symmetrically distributed on both sides of the suction hood.

[0010] Preferably, one end of the suction hood is a suction port, which is arranged toward the spinning box, and the other end is connected to a ventilation branch pipe, which is connected to the ventilation main pipe through the ventilation branch pipe.

[0011] Preferably, the suction hood is tilted downward near the end of the ventilation pipe at a certain angle of 1-10°, which can reduce the accumulation of monomers and oligomers in the suction hood and extend the cleaning cycle of the suction hood.

[0012] Preferably, there are two wind deflectors, one of which is arranged at the suction port of the suction hood, and the other is symmetrically distributed at the junction of the inclined part and the non-inclined part of the lower shell of the suction hood with the cross-sectional center of the suction hood as the reference. The suction of the spinneret is stable and uniform in the circumferential direction, and no large fluctuation is caused to the primary spinning.

[0013] Preferably, the suction hood has a rectangular longitudinal section at one end close to the spinneret, a simple structure, a height of 5-15 cm, and a distance of 10-20 cm from the spinneret.

[0014] Preferably, the transverse cross-section of the suction hood near the ventilation branch pipe end is an isosceles trapezoid, the upper shell of the suction hood is provided with a fixing plate, and the lower shell is fixed to the upper shell by butterfly bolts with shaft sleeves, which is convenient for disassembly and cleaning.

[0015] Preferably, the guide plate is arranged in a rectangular parallelepiped formed by the inner side of the wind deflector and the non-inclined part of the suction hood, and includes a movable shaft and two guide plates fixed to the shaft sleeve by welding or bolts. The suction efficiency can be enhanced, the monomers and oligomers can be uniformly absorbed, and the fiber quality can be improved.

[0016] Preferably, the guide plate is V-shaped and located inside the wind baffle, the guide plate faces the ventilation branch pipe, and the angle between the two spoilers is 100-170°.

[0017] Preferably, a detachable connecting flange is provided on the top of the ventilation main pipe, and the flange is fixed to the top of the ventilation pipe by fixing bolts.

[0018] Preferably, a steam pipe is connected to the flange, and a steam nozzle is arranged at the lower end of the steam pipe.

[0019] Preferably, the steam pipe is arranged concentrically with the ventilation main pipe, and the bottom plane height of the steam nozzle is higher than the plane height of the upper surface of the suction hood upper shell of the suction hood, so as to facilitate the cleaning of the accumulated blockage in the ventilation pipe.

[0020] Preferably, a negative pressure measurement interface is provided on one side of the ventilation main pipe to detect the size of the suction negative pressure.

[0021] Preferably, a wind valve device is provided below the negative pressure measuring interface in the ventilation main pipe, and the wind valve device includes a wind valve body and a driving motor connected to the wind valve body. The wind valve body can control the air volume, is suitable for nylon fibers of different specifications, and has a wider range of applications.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The nylon spinning monomer suction device adds wind direction baffles and guide plates through the suction port to avoid disturbance to spinning and affect fiber quality when sucking monomer volatiles. The suction hood has a certain downward inclination angle, which can effectively prevent the monomer from condensing in the suction hood; the lower shell is detachable and a steam nozzle is added. The disassembly and cleaning of monomers and oligomers on the inner wall of the suction device is simple, convenient and efficient, which improves work efficiency and reduces labor costs. The air valve device can adjust different air volume outputs according to actual production needs, which is suitable for the production of nylon fibers of different specifications and varieties, and expands the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of the nylon spinning monomer suction device

[0025] Figure 2Top view of the nylon spinning monomer suction device

[0026] Figure 3 Left view of the suction hood of the nylon spinning monomer suction device

[0027] The figure includes 1. spinning box, 2. suction hood, 201. upper shell of suction hood, 202. lower shell of suction hood, 203. bolts, 3. wind direction baffle, 4. guide plate, 5. steam pipe, 501. steam nozzle, 6. ventilation main pipe, 601. ventilation branch pipe, 602. flange, 603. fixing bolts, 7. negative pressure measurement interface, 8. air valve, 801. air valve body, 802. air valve drive motor. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] like Figure 1 , Figure 2 , Figure 3 The nylon spinning monomer suction device shown comprises a spinning box 1, a suction hood 2, a suction hood upper shell 201, a suction hood lower shell 202, bolts 203, a wind direction baffle 3, a guide plate 4, a steam pipe 5, a steam nozzle 501, a ventilation main pipe 6, a ventilation branch pipe 601, a flange 602, a fixing bolt 603, a negative pressure measurement interface 7, an air valve 8, an air valve body 801, and an air valve driving motor 802. One end of the suction hood 2 is a suction port, which is arranged toward the spinning box 1, and the other end of the suction hood 2 relative to the suction port is connected to the ventilation main pipe 6 through the ventilation branch pipe 601. The longitudinal section of the end of the suction hood close to the spinneret is rectangular, with a simple structure, a height of 5-15 cm, and a distance of 10-20 cm from the spinneret.

[0030] The suction hood 2 is composed of the suction hood upper shell 201 and the suction hood lower shell 202. The suction hood upper shell 201 is also provided with bolts 203 symmetrically distributed on both sides of the suction hood upper shell 201. One end of the suction hood upper shell 201 is fixed to the spinning box 1 by welding, and the suction hood lower shell 202 is a detachable movable plate.

[0031] The cross section of one end of the suction hood 2 close to the ventilation branch pipe 601 is an isosceles trapezoid. The suction hood upper shell 201 is provided with a fixing plate. The suction hood shell 602 is fixed to the suction hood upper shell 601 by the butterfly bolt 603 with a shaft sleeve, which is convenient for disassembly and cleaning.

[0032] The end of the suction hood lower shell 202 close to the spinning box is placed horizontally, and the portion of the suction hood lower shell 202 close to the ventilation branch pipe 601 is inclined downward at a certain angle of 1-10°, which can reduce the accumulation of monomers and oligomers in the suction hood.

[0033] The guide plate 4 is provided inside the suction hood 2, and the guide plate 4 includes a movable shaft and two guide plates arranged on the movable shaft. The first sleeve and the second sleeve are sleeved on the outer side of the movable shaft by welding or bolting. The first sleeve and the second sleeve are respectively connected with a guide plate. The two guide plates are symmetrically distributed, and there are regularly arranged air holes on the guide plates. The angle between the two guide plates is 100-170°, which can be selected according to actual needs. The symmetrical structure of the guide plate can prevent airflow disturbance, ensure the stability of the flow field, and ensure uniform absorption.

[0034] The wind direction baffles 3 are arranged on both sides of the guide plate, one of which is arranged at the air inlet of the suction hood, and the other is symmetrically distributed at the junction of the inclined part and the non-inclined part of the lower shell of the suction hood based on the cross-sectional center of the suction hood shell. The suction of the spinneret is stable and uniform in the circumferential direction, and no large fluctuation is caused to the primary silk.

[0035] The suction hood 2 is connected to the ventilation main pipe 6 via the ventilation branch pipe 601 , and the airflow enters the ventilation main pipe 6 through the ventilation branch pipe 601 .

[0036] The ventilation main pipe 6 and the ventilation branch pipe 601 are both cylindrical structures. The ventilation branch pipe 601 is connected to the upper part of the ventilation main pipe 6 . The horizontal height of the welding position is lower than the bottom of the evaporation tube 5 and higher than the negative pressure measurement interface 7 .

[0037] The flange 602 is provided on the top of the ventilation main pipe 6. The flange 602 is fixed to the top of the ventilation main pipe 6 by the fixing bolts 603. The flange 602 is a detachable connecting flange.

[0038] The steam pipe 5 is installed at the center of the top of the ventilation main pipe 6 through the flange 602. The steam pipe 5 is coaxially arranged with the ventilation main pipe 6. It can be understood that the center of the cross section of the steam pipe 5 is located at the same position as the center of the cross section of the ventilation main pipe 6. The steam pipe 5 is installed at the center of the top of the ventilation main pipe 6 by using the flange 602 and the fixing bolts 603, and can be disassembled for cleaning.

[0039] The steam nozzle 501 is provided at the bottom of the steam pipe 5, and the horizontal height of the bottom of the steam nozzle 501 is higher than the height of the upper shell 201 of the suction hood. A steam generator quick-connect connector is provided on the upper part of the steam pipe. By steam blowing, accumulated blockages in the ventilation pipe can be quickly cleaned.

[0040] The negative pressure measurement interface 7 is arranged at the side of the ventilation main pipe 6, and is located lower than the position where the ventilation branch pipe 601 is welded to the ventilation main pipe, so as to detect the suction negative pressure value.

[0041] The air valve 8 is provided inside the ventilation main pipe 6 below the negative pressure measurement interface 7. The air valve 8 includes the air valve body 801 and the driving motor 802 connected to the air valve body 801. The driving motor 802 controls the air volume through the air valve body 801 to adapt to the production of nylon fibers of different specifications, and has a wide range of applications.

[0042] The specific embodiments of the present utility model will be described in detail below.

[0043] Example 1

[0044] During the POY spinning process of 20D / 24F nylon 6, most of the monomers and other volatiles enter the exhaust hood 2 from the spinning box 1 through the air inlet. The monomers pass through the wind baffle 3, the guide plate 4, and the wind baffle 3 at the air inlet in turn, and enter the ventilation main pipe through the ventilation branch pipe. The two wind baffles 3 suck the monomers stably and evenly in the circumferential direction, which will not cause large fluctuations in the primary yarn. The two guide flow vanes in the guide plate 3 are placed in an inverted V shape, and the angle between the two guide vanes is 150°. The air valve 8 is controlled to open at 30%, and the absolute pressure in the ventilation main pipe 6 is 5kpa. The volatiles at the spinneret can be evenly absorbed without causing disturbance to the spinning and affecting the fiber quality.

[0045] The longitudinal section of the end of the suction hood 2 near the spinneret is rectangular, with a simple structure, a height of 5 cm, and a distance of 20 cm from the spinneret. The transverse section of the end of the suction hood 2 near the ventilation branch pipe 601 is an isosceles trapezoid.

[0046] The suction hood lower shell 202 has a downward inclination angle of 5°, which can reduce the accumulation of monomers and oligomers in the suction hood and extend the suction hood cleaning cycle by 1 month. The suction hood lower shell 202 is fixed to the suction hood upper shell 201 by bolts 203 with shaft sleeves, which is easy to disassemble and clean.

[0047] The steam pipe 5 arranged at the center of the top of the ventilation main pipe 6 is connected to the steam generator interface quick plug, and the bottom of the steam pipe 5 is connected to the steam nozzle 501, and the height of the steam nozzle 501 is higher than the height of the upper shell 201 of the suction hood. When the main pipe is blocked, connect the steam generator. When the pressure of the steam generator reaches 0.3Mpa, open the output valve switch, and after ventilation for ten minutes, close the steam output valve switch to complete the cleaning of the main pipe without causing disturbance to the spinning.

[0048] Example 2

[0049] During the POY spinning process of 30D / 34F nylon 6, most of the monomers and other volatiles enter the exhaust hood 2 from the spinning box 1 through the air inlet. The monomers pass through the wind baffle 3, the guide plate 4, and the wind baffle 3 at the air inlet in turn, and enter the ventilation main pipe through the ventilation branch pipe. The two wind baffles 3 suck the monomers stably and evenly in the circumferential direction, which will not cause large fluctuations in the primary yarn. The two guide flow vanes in the guide plate 3 are arranged in an inverted V shape, and the angle between the two guide vanes is 140°. The air valve 8 is controlled to open at 40%, and the absolute pressure in the ventilation main pipe 6 is 4kpa. The volatiles at the spinneret can be evenly absorbed without causing disturbance to the spinning and affecting the fiber quality.

[0050] The longitudinal section of the end of the suction hood 2 near the spinneret is rectangular, with a simple structure, a height of 7 cm, and a distance of 16 cm from the spinneret. The transverse section of the end of the suction hood 2 near the ventilation branch pipe 601 is an isosceles trapezoid.

[0051] The suction hood lower shell 202 has a 6° downward inclination angle, which can reduce the accumulation of monomers and oligomers in the suction hood and extend the suction hood cleaning cycle by 1 month. The suction hood lower shell 202 is fixed to the suction hood upper shell 201 by bolts 203 with shaft sleeves, which is easy to disassemble and clean.

[0052] The steam pipe 5 arranged at the center of the top of the ventilation main pipe 6 is connected to the steam generator interface quick plug, and the bottom of the steam pipe 5 is connected to the steam nozzle 501, and the height of the steam nozzle 501 is higher than the height of the upper shell 201 of the suction hood. When the main pipe is blocked, connect the steam generator. When the pressure of the steam generator reaches 0.4Mpa, open the output valve switch, and after ventilation for ten minutes, close the steam output valve switch to complete the cleaning of the main pipe without causing disturbance to the spinning.

[0053] Example 3

[0054] During the POY spinning process of 40D / 12F nylon 6, most of the monomers and other volatiles enter the exhaust hood 2 from the spinning box 1 through the air inlet. The monomers pass through the wind baffle 3, the guide plate 4, and the wind baffle 3 at the air inlet in turn, and enter the ventilation main pipe through the ventilation branch pipe. The two wind baffles 3 suck the monomers stably and evenly in the circumferential direction, which will not cause large fluctuations in the primary yarn. The two guide flow vanes in the guide plate 3 are arranged in an inverted V shape, and the angle between the two guide vanes is 125°. The air valve 8 is controlled to open 50%, and the absolute pressure in the ventilation main pipe 6 is 3kpa. The volatiles at the spinneret can be evenly absorbed without causing disturbance to the spinning and affecting the fiber quality.

[0055] The longitudinal section of the end of the suction hood 2 near the spinneret is rectangular, with a simple structure, a height of 8 cm, and a distance of 15 cm from the spinneret. The transverse section of the end of the suction hood 2 near the ventilation branch pipe 601 is an isosceles trapezoid.

[0056] The suction hood lower shell 202 has an 8° downward inclination angle, which can reduce the accumulation of monomers and oligomers in the suction hood and extend the suction hood cleaning cycle by 1 month. The suction hood lower shell 202 is fixed to the suction hood upper shell 201 by bolts 203 with shaft sleeves, which is easy to disassemble and clean.

[0057] The steam pipe 5 arranged at the center of the top of the ventilation main pipe 6 is connected to the steam generator interface quick plug, and the bottom of the steam pipe 5 is connected to the steam nozzle 501, and the height of the steam nozzle 501 is higher than the height of the upper shell 201 of the suction hood. When the main pipe is blocked, connect the steam generator. When the pressure of the steam generator reaches 0.45Mpa, open the output valve switch, and after ventilation for ten minutes, close the steam output valve switch to complete the cleaning of the main pipe without causing disturbance to the spinning.

[0058] Example 4

[0059] During the POY spinning process of 70D / 24F nylon 6, most of the monomers and other volatiles enter the exhaust hood 2 from the spinning box 1 through the air inlet. The monomers pass through the wind baffle 3, the guide plate 4, and the wind baffle 3 at the air inlet in turn, and enter the ventilation main pipe through the ventilation branch pipe. The two wind baffles 3 suck the monomers stably and evenly in the circumferential direction, which will not cause large fluctuations in the primary yarn. The two guide flow vanes in the guide plate 3 are placed in an inverted V shape, and the angle between the two guide vanes is 115°. The air valve 8 is controlled to open at 70%, and the absolute pressure in the ventilation main pipe 6 is 3kpa. The volatiles at the spinneret can be evenly absorbed without causing disturbance to the spinning and affecting the fiber quality.

[0060] The longitudinal section of the end of the suction hood 2 near the spinneret is rectangular, with a simple structure, a height of 10 cm, and a distance of 12 cm from the spinneret. The transverse section of the end of the suction hood 2 near the ventilation branch pipe 601 is an isosceles trapezoid.

[0061] The suction hood lower shell 202 has an 8° downward inclination angle, which can reduce the accumulation of monomers and oligomers in the suction hood and extend the suction hood cleaning cycle by 1 month. The suction hood lower shell 202 is fixed to the suction hood upper shell 201 by bolts 203 with shaft sleeves, which is easy to disassemble and clean.

[0062] The steam pipe 5 arranged at the center of the top of the ventilation main pipe 6 is connected to the steam generator interface quick plug, and the bottom of the steam pipe 5 is connected to the steam nozzle 501, and the height of the steam nozzle 501 is higher than the height of the upper shell 201 of the suction hood. When the main pipe is blocked, connect the steam generator. When the pressure of the steam generator reaches 0.5Mpa, open the output valve switch, and after ventilation for ten minutes, close the steam output valve switch to complete the cleaning of the main pipe without causing disturbance to the spinning.

[0063] Example 5

[0064] During the POY spinning process of 100D / 36F nylon 6, most of the monomers and other volatiles enter the exhaust hood 2 from the spinning box 1 through the air inlet. The monomers pass through the wind baffle 3, the guide plate 4, and the wind baffle 3 at the air inlet in turn, and enter the ventilation main pipe through the ventilation branch pipe. The two wind baffles 3 suck the monomers stably and evenly in the circumferential direction, which will not cause large fluctuations in the primary yarn. The two guide flow vanes in the guide plate 3 are placed in an inverted V shape, and the angle between the two guide vanes is 110°. The air valve 8 is controlled to open 80%, and the absolute pressure in the ventilation main pipe 6 is 800pa. The volatiles at the spinneret can be evenly absorbed without causing disturbance to the spinning and affecting the fiber quality.

[0065] The longitudinal section of the end of the suction hood 2 near the spinneret is rectangular, with a simple structure, a height of 10 cm, and a distance of 10 cm from the spinneret. The transverse section of the end of the suction hood 2 near the ventilation branch pipe 601 is an isosceles trapezoid.

[0066] The suction hood lower shell 202 has a downward inclination angle of 10°, which can reduce the accumulation of monomers and oligomers in the suction hood and extend the suction hood cleaning cycle by 1 month. The suction hood lower shell 202 is fixed to the suction hood upper shell 201 by bolts 203 with shaft sleeves, which is easy to disassemble and clean.

[0067] The steam pipe 5 arranged at the center of the top of the ventilation main pipe 6 is connected to the steam generator interface quick plug, and the bottom of the steam pipe 5 is connected to the steam nozzle 501, and the height of the steam nozzle 501 is higher than the height of the upper shell 201 of the suction hood. When the main pipe is blocked, connect the steam generator. When the pressure of the steam generator reaches 0.5Mpa, open the output valve switch, and after ventilation for ten minutes, close the steam output valve switch to complete the cleaning of the main pipe without causing disturbance to the spinning.

[0068] The above description is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent transformation made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A nylon spinning monomer suction device, characterized in that: include: A spinning box (1), a suction hood (2) connected to the spinning box and a ventilation main pipe (6), wherein the suction hood (2) and the ventilation main pipe (6) are connected via a ventilation branch pipe (601), a steam pipe (5) is provided at the top of the ventilation main pipe (6), and a wind valve (8) is provided at the lower end, a wind direction baffle (3) and a guide plate (4) are provided inside the suction hood (2), and one end of the suction hood (2) close to the ventilation branch pipe (601) is tilted downward.

2. A nylon spinning monomer suction device according to claim 1, characterized in that: One end of the suction hood (2) is a suction port, and the suction port is arranged toward the spinning box (1). The suction hood (2) is composed of an upper shell (201) of the suction hood and a lower shell (202) of the suction hood. Bolts (203) are provided on the upper shell (201) of the suction hood. The upper shell (201) of the suction hood and the lower shell (202) of the suction hood are connected by the bolts (203). One end of the lower shell (202) of the suction hood close to the ventilation branch pipe (601) is inclined downward by 1-10 degrees.

3. A nylon spinning monomer suction device according to claim 2, characterized in that: There are two wind direction baffles (3), one is arranged at the suction port of the suction hood (2), and the other is arranged at the junction of the inclined part and the non-inclined part of the lower shell (202) of the suction hood.

4. A nylon spinning monomer suction device according to claim 1 or 2, characterized in that: A guide plate (4) is provided inside the suction hood (2); the guide plate (4) is V-shaped and located inside the wind baffle (3), with its opening facing the ventilation branch pipe (601); and the angle between the guide plates (4) is 100-170°.

5. A nylon spinning monomer suction device according to claim 1, characterized in that: A flange (602) is provided at the top of the ventilation main pipe (6). The flange (602) is arranged at the top of the ventilation main pipe (6) by means of fixing bolts (603). The steam pipe (5) is provided on the flange (602).

6. A nylon spinning monomer suction device according to claim 2, characterized in that: A steam nozzle (501) is provided at the bottom of the steam pipe (5), and the height of the bottom plane of the steam nozzle (501) is higher than the height of the upper surface of the upper shell (201) of the suction hood.

7. A nylon spinning monomer suction device according to claim 1 or 5, characterized in that: A negative pressure measurement interface (7) is provided on the side of the ventilation main pipe (6).

8. A nylon spinning monomer suction device according to claim 7, characterized in that: An air valve (8) is provided below the negative pressure measurement interface (7). The air valve (8) is arranged inside the ventilation main pipe (6). The air valve (8) is composed of an air valve body (801) and an air valve driving motor (802).

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