A head suction air device

Abstract

The application relates to a head suction device and relates to the technical field of textile machinery, which comprises a suction pipeline and a suction port arranged at the front end of the pipeline. The flexible rubber skin at the frontmost edge of the suction port is detachably connected, the extension direction of the flexible rubber skin is parallel to the opening plane of the suction port and covers at least one third of the width of the suction port, the two end extension parts are fixed to the outer side wall of the suction port through a glue layer, and the free edge is provided with an arc-shaped protective edge facing the suction pipeline. The flexible rubber skin directly expands the effective suction area of the suction port and covers the key area where the returned flowers of the front roller are prone to be generated; the glue layer tightly fixes the extension part of the flexible rubber skin to the outer side wall of the suction port, so that air flow is prevented from leaking from the gap between the rubber skin and the suction port; and the arc-shaped protective edge guides the air flow to converge to the inner side of the suction pipeline, so that the edge air flow diffusion is reduced. The suction coverage range is effectively expanded, the defect of insufficient edge air flow coverage of the traditional device is eliminated, and the air flow leakage amount is reduced.

Description

Technical Field

[0001] This application relates to the field of textile machinery technology, and in particular to a head-and-suction device. Background Technology

[0002] Existing head-to-head suction devices, even after adjusting the airflow force and suction angle, still suffer from the problem of incomplete suction of yarn residue from the front roller into the duct. This results in the residue adhering to the surface of the front roller, forming defective streaks and affecting yarn quality. Traditional improvement methods rely on a single adjustment of airflow force or angle, failing to optimize the airflow distribution in the suction area from an aerodynamic perspective, thus limiting suction efficiency. For example, conventional suction port structures are prone to turbulence under high-speed airflow, increasing drag loss. Simultaneously, insufficient edge airflow coverage fails to effectively capture fine residue on the front roller surface. Furthermore, existing devices lack a flexible sealing design at the suction area boundary, causing some airflow to leak from the suction port edge, further reducing suction effectiveness. Therefore, this paper proposes a head-to-head suction device. Utility Model Content

[0003] The purpose of this application is to provide a head-and-suction device that has the ability to solve the problems of incomplete capture of return patterns and airflow leakage from the front roller.

[0004] The present application provides a head-mounted suction device with the following technical solution: it includes a suction pipe and a suction port located at the front end of the pipe. The leading edge of the suction port is detachably connected to a flexible rubber sheet. The extension direction of the flexible rubber sheet is parallel to the opening plane of the suction port, and the width of the flexible rubber sheet covering the suction port is at least one-third of the width of the suction port. A limiting device is provided at the front end of the suction port. The limiting device includes an n-shaped limiting shell and a bolt. The n-shaped limiting shell is fixed to the front end of the suction port by the bolt. A threaded cap is provided on the front side of the n-shaped limiting shell. A threaded rod is threadedly connected inside the threaded cap. One end of the threaded rod is fixedly connected to a limiting plate. The limiting plate is movably disposed inside the n-shaped limiting shell. The other end of the threaded rod is fixedly connected to a rotating handle. The limiting plate is configured to restrict the displacement of the flexible rubber sheet.

[0005] By adopting the above technical solution, the flexible rubber sheet that can be detachably connected to the leading edge of the air inlet extends in a direction parallel to the opening plane of the air inlet and covers a certain proportion of the width of the air inlet, directly expanding the effective air suction area of ​​the air inlet. This solves the problem that the air suction range of traditional devices cannot cover the critical area of ​​the front roller's blemishes. At the same time, the limiting device at the front end of the air inlet can adjust the position of the limiting plate by rotating the handle, so that the limiting plate fits tightly against the flexible rubber sheet, preventing the rubber sheet from shifting due to airflow impact or device vibration, ensuring the stability of the air suction area, reducing the omission of blemishes on the front roller, and avoiding the generation of defective stripes.

[0006] Preferably, the length of the flexible rubber sheet is greater than the width of the air intake, and both ends extend beyond the edge of the air intake to form an extension, and the extension is fixed to the outer wall of the air intake by an adhesive layer.

[0007] By adopting the above technical solution, the length of the flexible rubber sheet is greater than the width of the air inlet, and the extensions formed by the two ends beyond the edge are fixed to the outer wall of the air inlet by the adhesive layer. On the one hand, this solves the problem that the flexible rubber sheet is prone to curling when connected only by the front edge, ensuring that the rubber sheet is flat; on the other hand, it can seal the gap between the rubber sheet and the air inlet, prevent airflow from leaking from the gap, and allow the negative pressure generated by the air inlet to be concentrated on the front roller to capture the return of the rubber, thereby improving the air inlet efficiency and reducing the risk of return of the rubber.

[0008] Preferably, the flexible rubber sheet is made of elastic rubber material, and its surface is provided with uniformly distributed guide grooves, the extension direction of which is consistent with the axis of the suction pipe.

[0009] By adopting the above technical solution, the flexible rubber sheet is made of elastic rubber material, which has a certain degree of flexibility and can be adapted to the installation curvature of the front edge of the air intake, avoiding the problem of rigid materials being easily broken; at the same time, the evenly distributed guide grooves on the surface of the rubber sheet extend in the same direction as the axis of the air intake pipe, which can sort out the airflow entering the air intake and guide the airflow to flow in an orderly manner along the pipe axis, solving the problem of turbulence and large resistance loss that are easy to generate under high-speed airflow in traditional devices, improving airflow stability, and helping to efficiently capture fine return flowers.

[0010] Preferably, the thickness of the flexible rubber sheet varies in a gradient along the width direction of the air intake edge, with the thickness near the center area being greater than that at the edge area, and the side of the limiting plate facing the flexible rubber sheet having a stepped shape adapted to the thickness of the flexible rubber sheet.

[0011] By adopting the above technical solution, the thickness of the flexible rubber sheet varies in a gradient along the width direction of the air intake edge, and the side of the limiting plate facing the rubber sheet is a matching step shape, so that the two can fit together completely. This avoids the rubber sheet being crushed by the limiting plate due to its thin edge, and also prevents the limiting plate from becoming loose due to its thick center. This solves the problem of poor fit between the traditional flat limiting plate and the rubber sheet, which easily causes the rubber sheet to deform. At the same time, the flat rubber sheet can avoid the generation of irregular airflow channels, ensure stable airflow, and further improve the effect of capturing return patterns.

[0012] Preferably, the inner wall of the n-type limiting shell is provided with a flexible protective layer, which covers the area where the n-type limiting shell contacts the limiting plate, and the surface of the flexible protective layer is smooth.

[0013] By adopting the above technical solution, the flexible protective layer on the inner wall of the n-type limiting shell covers the contact area between the shell and the limiting plate, and the surface is smooth. On the one hand, it can reduce the friction and wear of the limiting plate when it moves inside the n-type limiting shell, and extend the service life of the n-type limiting plate and the n-type limiting shell.

[0014] Preferably, the cross-section of the guide channel is U-shaped, and the guide channels are continuously distributed along the extension direction of the flexible rubber, with consistent spacing between adjacent guide channels.

[0015] By adopting the above technical solution, the cross-section of the guide groove is U-shaped and continuously distributed along the extension direction of the flexible rubber with consistent spacing between adjacent grooves. Compared with ordinary straight grooves, the U-shaped structure has stronger airflow guidance, which can further regulate the airflow direction and prevent the airflow from spreading disorderly in the groove. At the same time, the continuous and equally spaced distribution can make the airflow uniformly stressed on the surface of the flexible rubber, further suppressing turbulence generation, reducing airflow resistance loss, and ensuring that the airflow can stably and efficiently carry the front roller back into the suction duct, improving the consistency of the suction effect.

[0016] Preferably, the free edge of the flexible rubber sheet is provided with an arc-shaped protective edge, the protective edge and the flexible rubber sheet are integrally structured, and the bending direction of the protective edge is towards the side of the air suction duct.

[0017] By adopting the above technical solution, the arc-shaped protective edge of the free edge of the flexible rubber sheet is an integral structure with the rubber sheet, and the bending direction is towards the suction pipe. This can guide the airflow at the edge of the rubber sheet to converge towards the inside of the suction pipe, solving the problem that the straight edge of the traditional rubber sheet easily leads to the diffusion of edge airflow and insufficient suction range. At the same time, the arc-shaped structure can avoid the edge of the rubber sheet from being snagged and damaged, extend the service life of the rubber sheet, and further expand the effective suction area, ensuring that even the slight blemishes on the surface of the front roller can be captured by the airflow.

[0018] Preferably, the connection between the threaded cap and the n-type limiting shell is provided with an anti-loosening washer to prevent the threaded connection from loosening and to counteract the vibration of the device during operation.

[0019] By adopting the above technical solution, the anti-loosening washer at the connection between the threaded cap and the n-type limiting shell can offset the vibration during the operation of the device, prevent the connection between the threaded cap and the n-type limiting shell from loosening, and solve the problem that traditional threaded connections are prone to loosening due to vibration, resulting in displacement of the limiting plate and failure of the rubber limiting. It ensures that the limiting device maintains a stable limiting state for a long time, ensures that the suction area of ​​the flexible rubber does not shift, continuously and efficiently captures the return of yarn from the front roller, and maintains stable yarn quality.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] This head-and-suction device features a flexible rubber sheet detachably connected to the leading edge of the suction port. The sheet extends parallel to the suction port opening plane and covers at least one-third of the suction port width. Both ends of the extended portion are fixed to the outer wall of the suction port via adhesive layers. The free edge has an arc-shaped protective edge facing the suction duct. The flexible rubber sheet directly expands the effective suction area of ​​the suction port, covering the critical area prone to backflow on the front roller. The adhesive layer tightly fixes the extended portion of the flexible rubber sheet to the outer wall of the suction port, preventing airflow leakage from the gap between the rubber sheet and the suction port. The arc-shaped protective edge guides the airflow towards the inner side of the suction duct, reducing edge airflow diffusion. This effectively expands the suction coverage area, filling the gap of insufficient edge airflow coverage in traditional devices, while reducing airflow leakage and ensuring the surface of the front roller... The return cotton can be more fully drawn into the suction duct, significantly reducing the defective streaks formed by return cotton adhesion and improving yarn quality. A limiting device, using bolts to fix the N-shaped limiting shell to the front end of the suction port, and then rotating the handle to drive the threaded rod, moves the limiting plate inside the N-shaped limiting shell until it is tightly fitted with the flexible rubber, thus limiting and fixing the flexible rubber. The flexible protective layer reduces friction and wear between the limiting plate and the N-shaped limiting shell, while the anti-loosening washer counteracts vibrations during device operation, preventing the connection between the threaded cap and the N-shaped limiting shell from loosening and preventing displacement of the flexible rubber due to airflow impact or device vibration, ensuring the suction area remains stable. Simultaneously, it ensures long-term stable operation of the limiting device, preventing limiting failure due to loose connections and continuously guaranteeing the return cotton capture effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this application;

[0023] Figure 2 This is a three-dimensional enlarged structural schematic diagram of the limiting device of this application;

[0024] Figure 3 This is a schematic diagram of the structure of the limiting device in this application, viewed from the side section.

[0025] Figure 4 This is a partial structural diagram of the rear side of the flexible rubber sheet in this application;

[0026] Figure 5 For this application Figure 1 A schematic diagram of the structure at point A in the middle.

[0027] In the picture:

[0028] 1. Suction duct; 2. Suction port; 3. Flexible rubber sheet; 4. Limiting device; 41. N-type limiting shell; 42. Bolt; 43. Threaded cap; 44. Threaded rod; 45. Limiting plate; 46. Rotating handle; 5. Adhesive layer; 6. Guide channel; 7. Flexible protective layer; 8. Protective edge. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0030] Example 1: A head-mounted suction device, referring to Figure 1 , Figure 2 and Figure 3 The system includes an air intake duct 1 and an air intake vent 2 located at the front end of the duct. A flexible rubber sheet 3 is detachably connected to the leading edge of the air intake vent 2. The extension direction of the flexible rubber sheet 3 is parallel to the opening plane of the air intake vent 2, and the width of the flexible rubber sheet 3 covering the air intake vent 2 is at least one-third of the width of the air intake vent 2. A limiting device 4 is provided at the front end of the air intake vent 2. The limiting device 4 includes an n-shaped limiting shell 41 and a bolt 42. The n-shaped limiting shell 41 is fixed to the front end of the air intake vent 2 by the bolt 42. A threaded cap 43 is threaded through the front side of the n-shaped limiting shell 41. A threaded rod 44 is threadedly connected inside the threaded cap 43. One end of the threaded rod 44 is fixedly connected to a limiting plate 45, which is movably disposed inside the n-shaped limiting shell 41. The other end of the threaded rod 44... A rotating handle 46 is fixedly connected to the end, and a limiting plate 45 is set to restrict the displacement of the flexible rubber 3. The flexible rubber 3, which is detachably connected to the foremost edge of the suction port 2, extends in a direction parallel to the opening plane of the suction port 2 and covers a certain proportion of the width of the suction port 2, directly expanding the effective suction area of ​​the suction port 2. This solves the problem that the suction range of traditional devices cannot cover the critical area of ​​the front roller blemish. At the same time, the limiting device 4 at the front end of the suction port 2 can adjust the position of the limiting plate 45 by rotating the handle 46, so that the limiting plate 45 fits tightly against the flexible rubber 3, preventing the rubber from shifting due to airflow impact or device vibration, ensuring the stability of the suction area, reducing the omission of front roller blemishes, and avoiding the generation of defect strips.

[0031] Reference Figure 1 , Figure 2 and Figure 4The flexible rubber sheet 3 is longer than the width of the air intake 2, and its two ends extend beyond the edge of the air intake 2 to form extensions. These extensions are fixed to the outer wall of the air intake 2 by an adhesive layer 5. The flexible rubber sheet 3 is made of elastic rubber material, and its surface has evenly distributed guide grooves 6. The extension direction of the guide grooves 6 is consistent with the axis of the air intake pipe 1. The flexible rubber sheet 3 is longer than the width of the air intake 2, and the extensions at both ends are fixed to the outer wall of the air intake 2 by an adhesive layer 5. This design solves the problem of the flexible rubber sheet 3 easily warping when only connected at the front edge, ensuring the rubber sheet is flat. It also seals the gap between the rubber sheet and the air intake 2, preventing air from... The leakage from the gaps allows the negative pressure generated by the suction duct 1 to be concentrated on the front roller for capturing return defects, improving suction efficiency and reducing the risk of return defects adhering. The flexible rubber sheet 3 is made of elastic rubber material and has a certain degree of flexibility, which can be adapted to the installation curvature of the front edge of the suction port 2, avoiding the problem of rigid materials being easily broken. At the same time, the evenly distributed guide grooves 6 on the surface of the rubber sheet extend in the same direction as the axis of the suction duct 1, which can sort out the airflow entering the suction port 2 and guide the airflow to flow orderly along the axis of the duct. This solves the problem of turbulence and large resistance loss that are easy to generate under high-speed airflow in traditional devices, improves airflow stability, and helps to capture fine return defects efficiently.

[0032] Reference Figure 1 , Figure 2 and Figure 3 The thickness of the flexible rubber sheet 3 varies gradually along the width direction of the air intake 2, with the thickness near the center being greater than that at the edge. The side of the limiting plate 45 facing the flexible rubber sheet 3 has a stepped shape adapted to its thickness. A flexible protective layer 7 is provided on the inner wall of the n-shaped limiting shell 41, covering the area where the n-shaped limiting shell 41 contacts the limiting plate 45. The surface of the flexible protective layer 7 is smooth. The thickness of the flexible rubber sheet 3 varies gradually along the width direction of the air intake 2, and the side of the limiting plate 45 facing the rubber sheet has a matching stepped shape, allowing the two to fit perfectly together—avoiding… Because the edge of the rubber is too thin, it is crushed by the limiting plate 45. This also prevents the limiting plate from becoming loose due to the center of the rubber being too thick. This solves the problem of poor adhesion between the traditional flat limiting plate 45 and the rubber, which can easily cause the rubber to deform. At the same time, the flat rubber can avoid the generation of irregular airflow channels, ensure stable airflow, and further improve the effect of capturing backflow. The flexible protective layer 7 on the inner wall of the n-shaped limiting shell 41 covers the contact area between the shell and the limiting plate 45, and the surface is smooth. On the one hand, it can reduce the friction and wear of the limiting plate 45 when it moves inside the n-shaped limiting shell 41, and extend the service life of the n-shaped limiting plate 45 and the n-shaped limiting shell 41.

[0033] Reference Figure 1 , Figure 2 and Figure 5The guide groove 6 has a U-shaped cross-section and is continuously distributed along the extension direction of the flexible rubber sheet 3. The spacing between adjacent guide grooves 6 is consistent. The free edge of the flexible rubber sheet 3 is provided with an arc-shaped protective edge 8, which is an integral structure with the flexible rubber sheet 3. The bending direction of the protective edge 8 faces the suction pipe 1. The connection between the threaded cap 43 and the n-shaped limiting shell 41 is provided with an anti-loosening washer to prevent the threaded connection from loosening and to counteract the vibration of the device operation. The U-shaped cross-section of the guide groove 6 and its continuous distribution along the extension direction of the flexible rubber sheet 3 with consistent spacing between adjacent grooves provide stronger airflow guidance compared to ordinary straight grooves. This can further regulate the airflow direction and prevent the airflow from spreading disorderly within the groove. At the same time, the continuous and equally spaced distribution allows the airflow to be evenly stressed on the surface of the flexible rubber sheet 3, further suppressing turbulence generation, reducing airflow resistance loss, and ensuring that the airflow can stably and efficiently carry the front roller backflow into the suction pipe 1, thereby improving the suction efficiency. To ensure consistency, the curved protective edge 8 of the free edge of the flexible rubber sheet 3 is an integral structure with the rubber sheet, and the curvature direction is towards the suction pipe 1. This guides the airflow at the edge of the rubber sheet to converge towards the inside of the suction pipe 1, solving the problem that the straight edge of the traditional rubber sheet easily leads to the diffusion of edge airflow and insufficient suction range. At the same time, the curved structure can avoid the edge of the rubber sheet from being snagged and damaged, extending the service life of the rubber sheet, and further expanding the effective suction area, ensuring that even the slight blemishes on the surface of the front roller can be captured by the airflow. The anti-loosening washer at the connection between the threaded cap 43 and the n-type limiting shell 41 can offset the vibration during the operation of the device, preventing the connection between the threaded cap 43 and the n-type limiting shell 41 from loosening, solving the problem that traditional threaded connections are prone to loosening due to vibration, causing the limiting plate 45 to shift and the rubber sheet to fail to limit. This ensures that the limiting device 4 maintains a stable limiting state for a long time, ensuring that the suction area of ​​the flexible rubber sheet 3 does not shift, continuously and efficiently capturing the blemishes on the front roller, and maintaining the stability of yarn quality.

[0034] In this embodiment, the flexible rubber sheet 3, detachably connected to the leading edge of the suction port 2, extends parallel to the opening plane of the suction port 2 and covers at least one-third of the width of the suction port 2. The extended portions at both ends are fixed to the outer wall of the suction port 2 by adhesive layers 5. The free edge is provided with an arc-shaped protective edge 8 facing the suction duct 1. The flexible rubber sheet 3 directly expands the effective suction area of ​​the suction port 2, covering the critical area where the front roller is prone to bleeding. The adhesive layer 5 tightly fixes the extended portion of the flexible rubber sheet 3 to the outer wall of the suction port 2, preventing airflow leakage from the gap between the rubber sheet and the suction port 2. The arc-shaped protective edge 8 guides the airflow towards the inner side of the suction duct 1, reducing edge airflow diffusion. This effectively expands the suction coverage area, filling the gap of insufficient edge airflow coverage in traditional devices, while reducing airflow leakage, allowing the bleeding on the surface of the front roller to be more fully covered. The suction duct 1 significantly reduces defective stripes caused by lint adhesion, improving yarn quality. The n-shaped limiting shell 41 is fixed to the front end of the suction port 2 via the limiting device 4 and bolts 42. Rotating the handle 46 drives the threaded rod 44 to rotate, causing the limiting plate 45 to move inside the n-shaped limiting shell 41 until it is tightly fitted with the flexible rubber 3, thus limiting and fixing the flexible rubber 3. The flexible protective layer 7 reduces friction and wear between the limiting plate 45 and the n-shaped limiting shell 41, while the anti-loosening washer counteracts vibrations during device operation, preventing the threaded cap 43 from loosening and preventing displacement of the flexible rubber 3 due to airflow impact or device vibration, ensuring the suction area remains stable. Simultaneously, it ensures the long-term stable operation of the limiting device 4, preventing limiting failure due to loose connections and continuously guaranteeing the lint capture effect.

[0035] The implementation principle of this application embodiment is as follows: After the device is started, the suction pipe 1 generates negative pressure, and the airflow enters the pipe through the suction port 2. At this time, the flexible rubber sheet 3, which is detachably connected to the leading edge of the suction port 2, plays a key role—its extension direction is parallel to the opening plane of the suction port 2, and it covers a certain proportion of the width of the suction port 2, directly expanding the effective suction area of ​​the suction port 2, so that the suction range can cover the key area where the front roller is prone to backflow; at the same time, the extensions of the flexible rubber sheet 3 that extend beyond the edge of the suction port 2 are tightly fixed to the outer wall of the suction port 2 by the adhesive layer 5, preventing the airflow from leaking from the gap between the rubber sheet and the suction port 2, and ensuring that the negative pressure can be concentrated on the surface of the front roller to capture backflow; when the airflow contacts the flexible rubber sheet 3, the guide grooves 6 evenly distributed on the surface of the rubber sheet begin to play a role: because the extension direction of the guide grooves 6 is parallel to the opening plane of the suction pipe 1, the guide grooves 6 are parallel to the opening plane of the suction port 2, and it covers a certain proportion of the width of the suction port 2, directly expanding the effective suction area of ​​the suction port 2, so that the suction range can cover the key area where the front roller is prone to backflow; at the same time, the extensions of the flexible rubber sheet 3 that extend beyond the edge of the suction port 2 are tightly fixed to the outer wall of the suction port 2 by the adhesive layer 5, preventing the airflow from leaking from the gap between the rubber sheet and the suction port 2, ensuring that the negative pressure can be concentrated on the surface of the front roller to capture backflow; when the airflow contacts the flexible rubber sheet 3, the guide grooves 6 evenly distributed on the surface of the rubber sheet begin to play a role: because the extension direction of the guide grooves 6 is parallel to the opening plane of the suction pipe 1, the guide grooves 6 are parallel to the opening plane of With consistent axes and a U-shaped cross-section, continuously distributed along the extension direction of the flexible rubber sheet 3, the airflow is "combed and guided" by the guide groove 6. The airflow, which originally diffused randomly on the surface of the flexible rubber sheet 3, is guided into an orderly airflow along the axis of the suction pipe 1, reducing the mutual collision between airflows. This suppresses the turbulence that is easily generated under high-speed airflow in traditional devices, reduces airflow resistance loss, and ensures that the airflow can flow stably and efficiently to the suction pipe 1. The arc-shaped protective edge 8 provided on the free edge of the flexible rubber sheet 3 further guides the edge airflow to converge towards the inside of the suction pipe 1, preventing the airflow from diffusing from the edge of the rubber sheet. During this process, the freckles on the surface of the front roller are carried by the stable airflow and enter the suction pipe through the suction port 2 along with the airflow. Path 1 effectively captures return defects, preventing them from adhering to the surface of the front roller and forming defect strips. To prevent the flexible rubber sheet 3 from shifting due to airflow impact or device vibration, the limiting device 4 at the front end of the suction port 2 provides stable protection throughout the process: first, the n-shaped limiting shell 41 is fixed to the front end of the suction port 2 by bolts 42, and then the rotating handle 46 drives the threaded rod 44 to rotate. Because the threaded rod 44 is threadedly connected to the threaded cap 43 on the front side of the n-shaped limiting shell 41, the threaded rod 44 will drive the limiting plate 45 fixed at one end to move inside the n-shaped limiting shell 41 until the limiting plate 45 is tightly attached to the flexible rubber sheet 3, thus limiting and fixing the flexible rubber sheet 3. At the same time, the flexible protective layer on the inner wall of the n-shaped limiting shell 41... 7. It can reduce friction and wear between the limiting plate 45 and the shell wall when the limiting plate 45 moves; the anti-loosening washer at the connection between the threaded cap 43 and the n-type limiting shell 41 can offset the vibration during the operation of the device, prevent the threaded connection from loosening, and ensure the long-term stable operation of the limiting device 4; because the thickness of the flexible rubber 3 varies in gradient along the width direction of the edge of the air inlet 2, and the side of the limiting plate 45 facing the flexible rubber 3 is stepped to match the thickness of the rubber, the two can fit together completely - neither the edge of the rubber is too thin and will be crushed by the limiting plate 45, nor the center of the rubber is too thick and will loosen the limiting, ensuring that the flexible rubber 3 is always in a flat state, avoiding irregular airflow channels caused by rubber deformation, and further ensuring airflow stability and the effect of capturing backflow.

Claims

1. A head-mounted suction device, comprising a suction duct (1) and a suction port (2) disposed at the front end of the duct, characterized in that: The leading edge of the air intake (2) is detachably connected to a flexible rubber sheet (3). The extending direction of the flexible rubber sheet (3) is parallel to the opening plane of the air intake (2), and the width of the flexible rubber sheet covering the air intake (2) is at least one-third of the width of the air intake (2). A limiting device (4) is provided at the front end of the air intake (2). The limiting device (4) includes an n-shaped limiting shell (41) and a bolt (42). The n-shaped limiting shell (41) is connected to the front end of the air intake (2) by the bolt (42). The n-shaped limiting shell (41) is fixedly provided with a threaded cap (43) on the front side. The threaded cap (43) is threadedly connected to a threaded rod (44). One end of the threaded rod (44) is fixedly connected to a limiting plate (45). The limiting plate (45) is movably disposed inside the n-shaped limiting shell (41). The other end of the threaded rod (44) is fixedly connected to a rotating handle (46). The limiting plate (45) is set to correspond to the flexible rubber (3) to limit the displacement of the flexible rubber (3).

2. The head-mounted suction device according to claim 1, characterized in that: The length of the flexible rubber sheet (3) is greater than the width of the air inlet (2), and both ends extend beyond the edge of the air inlet (2) to form an extension. The extension is fixed to the outer wall of the air inlet (2) by the adhesive layer (5).

3. The head-mounted suction device according to claim 1, characterized in that: The flexible rubber sheet (3) is made of elastic rubber material and has uniformly distributed guide grooves (6) on its surface. The extension direction of the guide grooves (6) is consistent with the axis of the suction pipe (1).

4. The head-mounted suction device according to claim 1, characterized in that: The thickness of the flexible rubber sheet (3) varies in a gradient along the width direction of the air intake (2) edge, with the thickness near the center area being greater than that of the edge area, and the limiting plate (45) facing the flexible rubber sheet (3) is in a stepped shape that matches the thickness of the flexible rubber sheet (3).

5. A head-mounted suction device according to claim 1, characterized in that: The inner wall of the n-type limiting shell (41) is provided with a flexible protective layer (7), which covers the area where the n-type limiting shell (41) contacts the limiting plate (45), and the surface of the flexible protective layer (7) is smooth.

6. A head-mounted suction device according to claim 3, characterized in that: The cross-section of the guide groove (6) is U-shaped, and the guide groove (6) is continuously distributed along the extension direction of the flexible rubber (3), with the spacing between adjacent guide grooves (6) being consistent.

7. The head-mounted suction device according to claim 1, characterized in that: The free edge of the flexible rubber sheet (3) is provided with an arc-shaped protective edge (8). The protective edge (8) and the flexible rubber sheet (3) are an integral structure, and the bending direction of the protective edge (8) is towards the side of the air suction pipe (1).

8. A head-mounted suction device according to claim 1, characterized in that: The connection between the threaded cap (43) and the n-type limiting shell (41) is provided with an anti-loosening washer to prevent the threaded connection from loosening and to counteract the vibration of the device during operation.

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