Net bottom air guide structure with guide function

Abstract

The invention relates to the technical field of non-woven fabrics, in particular to a net bottom air guide structure with a guide function, which comprises an air guide cover, an air guide cavity is formed in the air guide cover, the air guide cavity comprises a middle air guide area and a front air guide area, the middle air guide area is positioned above an air suction opening and is used for being arranged right below a drafting and lapping device, and the front air guide area is positioned above the air suction opening. Therefore, air flow generated by the drafting and lapping device is sucked downwards; the front air guide area is located in the position, facing the web curtain, of the middle air guide area, and the depth of the front air guide area is decreased along with increasing of the distance between the front air guide area and the middle air guide area. The air guide assembly is connected with the air guide cover at an adsorption opening above the front air guide area, and the lower portion of the air guide assembly inclines towards the moving direction of the web curtain and is used for guiding airflow to adsorb the fiber web to the web curtain. The depth of the front air guide area of the air guide cover is gradually reduced in the moving direction of the web curtain, so that the effect that the farther away from the drafting and lapping device, the smaller the suction force is is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of nonwoven fabrics, and more particularly to a net bottom wind guiding structure with a guiding function. Background Art

[0002] In the field of spunbond nonwoven technology, air drafting technology has been widely used. With the continuous improvement of drafting speed requirements, the momentum and flow rate of the drafting airflow generated by the drafting and laying device are getting higher and higher. After the fibers are laid on the net, the surrounding airflow is seriously disturbed, and the existing fibers on the net curtain are impacted, causing the fibers to slip or flip over a large area or in a local area, seriously affecting product quality and normal production activities.

[0003] The prior art with the announcement number CN217077974U discloses a suction air guide device, which discloses "comprising a base and an air guide assembly, a net curtain conveying channel is formed between the base and the air guide assembly, a suction air duct is provided in the base, the air duct opening of the suction air duct corresponds to the air guide assembly, a fan is provided at the bottom of the suction air duct, the air guide assembly comprises two brackets, and a plurality of guide plates fixed between the two brackets, the guide plates are detachably fixedly connected to the brackets, and the guide plates are arranged in an inclined shape, and are inclined downward from the inlet end of the net curtain conveying channel toward the outlet end."

[0004] A guide device is added above the mesh curtain, but in actual use, it is found that as production progresses, static electricity will gradually accumulate on the guide device. When the static electricity accumulates to a certain level, it will instantly discharge near the fiber, and the suction force will instantly increase, causing the fiber to suddenly flip over. At the same time, as the fiber itself moves forward with the mesh curtain, the surrounding static air exerts a force on it in the opposite direction of the fiber's movement, which is also a very important inducement for the fiber to flip over.

[0005] Therefore, how to prevent airflow and static electricity from causing the fiber web to flip over is the technical problem that this application aims to solve. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention proposes a mesh bottom air guide structure with a guiding function. The suction force is gradually reduced along the moving direction of the mesh curtain by designing a front air guide area with a gradually shallower depth. In addition, an air guide component is arranged under the mesh curtain to avoid the possibility of the fiber web flipping due to airflow and static electricity to the greatest extent.

[0007] The present invention provides a net bottom wind guide structure with a guiding function, and the technical solution is as follows:

[0008] A net bottom wind guide structure with a guiding function, comprising a wind guide cover, a wind guide cavity is provided in the wind guide cover, a suction port connected to the wind guide cavity is provided above the wind guide cover, the suction port is used to be arranged below the net curtain to adsorb the fiber net, and a suction port is provided below the wind guide cover, the suction port is used to discharge gas;

[0009] The air guide cavity includes a middle air guide area and a front air guide area. The middle air guide area is located above the air suction port. The middle air guide area is used to be arranged directly below the drafting and laying device, so as to suck the airflow generated by the drafting and laying device downward.

[0010] The front air guide area is located in the direction of the middle air guide area moving toward the net curtain, and the depth of the front air guide area decreases as the distance from the middle air guide area increases;

[0011] The air guide component is connected to the air guide cover at the adsorption port above the front air guide area, and the lower side of the air guide component is inclined in the direction of movement of the mesh curtain to guide the air flow to adsorb the fiber net on the mesh curtain.

[0012] In summary, the above technical solution has the following beneficial effects: the mesh curtain is arranged on the drafting and laying device to form an annular ring and circulate. The depth of the air guide area in front of the air guide cover of the present application gradually decreases along the direction of movement of the mesh curtain, thereby achieving the effect that the suction force is smaller the farther away from the drafting and laying device, and the air guide component is arranged in the air guide cover, below the mesh curtain, and the negative pressure generated forms a vertical downward component force and a component force toward the moving direction of the mesh curtain on the fiber web, which can make the fiber web firmly adsorbed on the mesh curtain and make the fiber web receive the same force as the moving direction of the mesh curtain, thereby avoiding wrinkles in the fiber web.

[0013] The advantages of the present application include: 1. The existing design of the air guide cavity is stepped and shallower, and the suction change is not stable enough; while the front air guide area of ​​the present application gradually becomes shallower, and the suction change is more stable. 2. The existing air guide assembly set above the mesh curtain and the mesh curtain have a height gap, and the thickness of the fiber mesh needs to be considered; while the air guide assembly of the present application can fit the mesh curtain more closely below, and there is no need to consider the fiber mesh thickness factor. 3. The air guide assembly of the prior art guides the airflow above the mesh curtain. Because there is a height gap between the air guide assembly and the mesh curtain, part of the airflow will flow within the height gap, and the airflow control effect is not stable enough; while the present application guides the airflow below the mesh curtain to draw suction diagonally downward, and the force exerted by the airflow on the fiber mesh is more uniform and stable. 4. In the prior art, the air guide component is located above the mesh curtain, and the fiber web moving under the air guide component is prone to generate static electricity, thereby adsorbing the fiber web, or instantaneous discharge will cause the fiber web to overturn. However, the air guide component of the present application is located below the mesh curtain, and there is a mesh curtain interval between the air guide component and the fiber web, so it is not easy to generate static electricity. Even if static electricity is generated, the adsorption force on the fiber web is downward. Finally, even if instantaneous discharge occurs, the impact on the fiber web is small due to the mesh curtain interval. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of an air guide cover having a mesh bottom air guide structure with a guiding function;

[0015] Figure 2 The present invention is a schematic diagram of an air guide plate of a mesh bottom air guide structure having a guiding function.

[0016] Figure numerals: 1. stretching and laying device; 10. air guide hood; 11. air guide cavity; 111. middle air guide area; 112. front air guide area; 12. suction port; 13. air suction port; 20. air guide plate; 21. connecting piece; 22. air guide piece; 30. air collecting tube; 31. air collecting cavity; 32. air collecting port; 33. connecting port. DETAILED DESCRIPTION

[0017] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1 and Figure 2 As shown, a net bottom wind guide structure with a guiding function includes a wind guide cover 10, a wind guide cavity 11 is provided in the wind guide cover 10, a suction port 12 connected to the wind guide cavity 11 is provided above the wind guide cover 10, the suction port 12 is used to be arranged below the net curtain to adsorb the fiber net, and a suction port 13 is provided below the wind guide cover 10, and the suction port 13 is used to discharge gas; the wind guide cavity 11 includes a middle wind guide area 111 and a front wind guide area 112, the middle wind guide area 111 is located above the suction port 13, and the middle wind guide area 112 is located above the suction port 13. The air guide area 111 is used to be arranged directly below the stretching and laying device 1, so as to suck the airflow generated by the stretching and laying device 1 downward; the front air guide area 112 is located in the direction of movement of the middle air guide area 111 facing the net curtain, and the depth of the front air guide area 112 decreases as the distance from the middle air guide area 111 increases; the air guide component is connected to the air guide cover 10 at the suction port 12 above the front air guide area 112, and the lower side of the air guide component is inclined in the direction of movement of the net curtain, so as to guide the airflow to adsorb the fiber web on the net curtain.

[0019] The net curtain is arranged on the drafting and laying device 1 to form an annular ring for cyclic rotation. The depth of the front air guide area 112 of the air guide cover 10 of the present application gradually decreases along the direction of movement of the net curtain, so as to achieve the effect that the suction force is smaller the farther away from the drafting and laying device 1, and the air guide component is arranged in the air guide cover 10, below the net curtain, and the negative pressure generated forms a vertical downward component force and a component force toward the moving direction of the net curtain on the fiber web, so that the fiber web can be firmly adsorbed on the net curtain, and the fiber web is subjected to the same force as the moving direction of the net curtain, so as to avoid wrinkles in the fiber web.

[0020] The advantages of the present application include: 1. The existing design of the air guide cavity 11 is stepped and shallower, and the suction change is not stable enough; while the front air guide area 112 of the present application gradually becomes shallower, and the suction change is more stable. 2. The existing air guide assembly arranged above the mesh curtain has a height gap with the mesh curtain, and the thickness of the fiber mesh needs to be considered; while the air guide assembly of the present application can fit the mesh curtain more closely below, and there is no need to consider the thickness of the fiber mesh. 3. The air guide assembly of the prior art guides the airflow above the mesh curtain. Because there is a height gap between the air guide assembly and the mesh curtain, part of the airflow will flow within the height gap, and the airflow control effect is not stable enough; while the present application guides the airflow below the mesh curtain to draw suction diagonally downward, and the force exerted by the airflow on the fiber mesh is more uniform and stable. 4. In the prior art, the air guide component is located above the mesh curtain, and the fiber web moving under the air guide component is prone to generate static electricity, thereby adsorbing the fiber web, or instantaneous discharge will cause the fiber web to overturn. However, the air guide component of the present application is located below the mesh curtain, and there is a mesh curtain interval between the air guide component and the fiber web, so it is not easy to generate static electricity. Even if static electricity is generated, the adsorption force on the fiber web is downward. Finally, even if instantaneous discharge occurs, the impact on the fiber web is small due to the mesh curtain interval.

[0021] The wind guide assembly includes a plurality of wind guide plates 20 arranged in parallel along the moving direction of the net curtain, and the wind guide plates 20 include connecting pieces 21 and wind guide pieces 22. The connecting pieces 21 are connected to the wind guide cover 10 at the suction port 12 above the front wind guide area 112. The connecting pieces 21 are arranged vertically, and the wind guide pieces 22 are arranged below the connecting pieces 21. One end of the wind guide pieces 22 away from the connecting pieces 21 is inclined toward the moving direction of the net curtain. Each vertically arranged connecting piece 21 is used to connect with the wind guide cover 10, and the inclined wind guide pieces 22 are used to generate inclined suction, so as to adsorb the fiber web on the net curtain.

[0022] The height of the connecting piece 21 is b, and the height of the air guide piece 22 is c. The height c of the air guide piece 22 is greater than four times the height b of the connecting piece 21. An intake channel is formed between each connecting piece 21, and an air guide channel is formed between each air guide piece 22. The higher the height of the connecting piece 21, the higher the height of the intake channel, and the farther the distance between the connecting pieces 21, the wider the width of the intake channel; the higher the height of the air guide piece 22, the higher the vertical height of the air guide channel, and the farther the vertical distance between the air guide piece 22, the wider the width of the air guide channel. The size of the intake channel and the air guide channel affects the size of the suction force. In order to achieve a better suction effect, the connecting piece 21 and the air guide piece 22 that form the channel need to be constrained to guide production. In order to make the suction force inclined, the airflow channel between the air guide pieces 22 should be higher, so that the airflow can be better guided obliquely. Therefore, as shown in the drawings, the cross-sectional height of the connecting piece 21 is b, and the cross-sectional height of the air guide piece 22 is c. The height b of the connecting piece 21 and the height c of the air guide piece 22 are required to satisfy the following relationship: 0≤4b≤c.

[0023] The angle between the air guide piece 22 and the horizontal plane is greater than or equal to 15° and less than or equal to 45°. Preferably, the angle between the air guide piece 22 and the horizontal plane is equal to 30°. The smaller the angle between the air guide piece 22 and the horizontal plane, the greater the horizontal component of the suction force; the larger the angle between the air guide piece 22 and the horizontal plane, the smaller the horizontal component of the suction force; therefore, the angle between the air guide piece 22 and the horizontal plane cannot be too large or too small. As shown in the figure, it is best if the angle θ of the air guide piece 22 satisfies 15°≤θ≤45°. Preferably, the angle θ of the air guide piece 22 is 30°.

[0024] The distance between each connecting piece 21 is less than or equal to the horizontal projection length of the air guide piece 22. The horizontal projections of the air guide plate 20 overlap, so that in the moving direction of the net curtain, the connecting piece 21 closest to a certain air guide piece 22 is located within the interval of its horizontal projection, so that the airflow always needs to pass through the air guide channel between each air guide piece 22 to enter the air guide cavity 11, so as to achieve the effect of generating inclined suction on the fiber web.

[0025] The distance between each connecting plate 21 is greater than or equal to half of the horizontal projection length of the air guide plate 22. The distance between the connecting plates cannot be too close, otherwise the air flow channel will be too narrow, the number of connecting plates required will increase, and the cost will increase. As shown in the figure, the distance between each connecting plate is x, the horizontal projection length of the air guide plate 22 is c*cosθ, and the relationship is 0.5c*cosθ≤x≤c*cosθ.

[0026] An air collecting cylinder 30 is provided below the air guide cover 10, and an air collecting cavity 31 is provided inside the air collecting cylinder 30. An air collecting port 32 connected to the air collecting cavity 31 is provided above the air collecting cylinder 30, and the air collecting port 32 is connected to the air suction port 13, and is used to connect the air guide cavity 11 and the air collecting cavity 31; a connecting port 33 connected to the air collecting cavity 31 is provided on one or both sides of the air collecting cylinder 30, and the connecting port 33 is used to connect an external fan. The externally connected fan is a power source, and the air collecting cylinder 30 collects the airflow of the air guide cover 10 and then discharges it from the connecting port 33.

[0027] The spacing of the air guide plates 20 increases as the distance from the middle air guide area 111 increases. Each air guide plate 20 is arranged in parallel in the front air guide area 112. The larger the spacing of the air guide plates 20, the worse the suction effect. In order to gradually reduce the suction, the spacing of the air guide plates 20 gradually increases within the above-mentioned distance range along the direction of movement of the net curtain, thereby achieving the effect that the suction is smaller the farther away from the drafting and laying device 1. The technology of the present invention is mainly to improve the laying quality. Considering the progressive direction of the net curtain, the method of gradually becoming shallower from the front air guide area 112 close to the middle air guide area 111 to the distance away from the middle air guide area 111 is adopted to ensure that the force of fiber adsorption gradually decays during the transmission process and no instantaneous fluctuation occurs. At the same time, a wind guide component with a certain guiding function is arranged above the front air guide area 112. The wind guide component can ensure that the horizontal component of the suction force close to the net curtain is in the same direction as the movement direction of the net curtain, thereby helping the fiber to stably adhere to the net curtain.

[0028] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A net bottom wind guide structure with guiding function, characterized in that: The invention comprises an air guide cover (10), wherein an air guide cavity (11) is provided in the air guide cover (10), an adsorption port (12) which is connected to the air guide cavity (11) is provided above the air guide cover (10), the adsorption port (12) is used to be arranged below the net curtain to adsorb the fiber net, and an air suction port (13) is provided below the air guide cover (10), and the air suction port (13) is used to discharge gas; The air guide cavity (11) comprises a middle air guide area (111) and a front air guide area (112), wherein the middle air guide area (111) is located above the air suction port (13), and the middle air guide area (111) is used to be arranged directly below the drafting and laying device (1), so as to suck the airflow generated by the drafting and laying device (1) downwards; The front air guide area (112) is located in the direction in which the middle air guide area (111) moves towards the net curtain, and the depth of the front air guide area (112) decreases as the distance from the middle air guide area (111) increases; The air guide component is connected to the air guide cover (10) at the suction port (12) above the front air guide area (112), and the lower side of the air guide component is inclined in the direction of movement of the net curtain to guide the air flow to adsorb the fiber net on the net curtain.

2. The net bottom wind guide structure with guiding function according to claim 1, characterized in that: The wind guide assembly comprises a plurality of wind guide plates (20) arranged in parallel along the moving direction of the net curtain, the wind guide plates (20) comprising a connecting piece (21) and an wind guide plate (22), the connecting piece (21) being connected to the wind guide cover (10) at the suction port (12) above the front wind guide area (112), the connecting piece (21) being arranged vertically, the wind guide plate (22) being arranged below the connecting piece (21), and the end of the wind guide plate (22) away from the connecting piece (21) being inclined toward the moving direction of the net curtain.

3. The net bottom wind guide structure with guiding function according to claim 2, characterized in that: The height of the connecting piece (21) is b, the height of the air guide piece (22) is c, and the height c of the air guide piece (22) is greater than four times the height b of the connecting piece (21).

4. The net bottom wind guide structure with guiding function according to claim 2, characterized in that: The included angle between the air guide plate (22) and the horizontal plane is greater than or equal to 15° and less than or equal to 45°.

5. The net bottom wind guide structure with guiding function according to claim 4, characterized in that: The included angle between the air guide plate (22) and the horizontal plane is equal to 30°.

6. The net bottom wind guide structure with guiding function according to claim 2, characterized in that: The distance between each of the connecting pieces (21) is less than or equal to the projection length of the air guide piece (22) in the horizontal direction.

7. The net bottom wind guide structure with guiding function according to claim 6, characterized in that: The distance between each of the connecting pieces (21) is greater than or equal to half of the projection length of the air guide piece (22) in the horizontal direction.

8. A net bottom wind guide structure with guiding function according to any one of claims 1 to 7, characterized in that: An air collecting cylinder (30) is arranged below the air guide cover (10), an air collecting cavity (31) is provided in the air collecting cylinder (30), an air collecting port (32) connected to the air collecting cavity (31) is arranged above the air collecting cylinder (30), and the air collecting port (32) is connected to the air suction port (13) for connecting the air guide cavity (11) and the air collecting cavity (31); A connection port (33) communicating with the air collecting chamber (31) is provided on one side or both sides of the air collecting cylinder (30), and the connection port (33) is used to connect to an external fan.

9. A net bottom wind guide structure with guiding function according to any one of claims 2 to 7, characterized in that: The spacing between the air guide plates (20) increases as the distance from the central air guide area (111) increases.

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