Lower air suction box for non-woven fabric lapper

Abstract

The utility model provides a lower air suction box for a non-woven fabric lapper, which comprises a box body, an air suction opening is arranged at the top of the box body, an air duct connected with the air suction opening is arranged in the box body, and the other end of the air duct is connected with a negative pressure suction mechanism. A guide plate is arranged above the air suction opening, the guide plate is divided into a plurality of areas in the breadth direction of the non-woven fabric, a plurality of air guide rods are arranged in each area in parallel at intervals, and the arrangement directions of the air guide rods in every two adjacent areas intersect to form an angle. The guide plate is simple and reasonable in structural design, the included-angle-shaped air guide rods are designed on the guide plate in the advancing direction of the web curtain, and the opening direction of the included angle of the air guide rods is consistent with the advancing direction of the web curtain. Therefore, when the web curtain passes through the upper portion of the air suction opening, negative pressure suction force located at the two corner positions of the air guide rod is opposite on the plane of the web curtain, the web curtain is stressed and opened along the two corner edges, the tension of the web curtain in the plane direction is guaranteed, the web curtain can stably pass through the air suction opening, and the situation that the forming quality is affected due to the fact that the web curtain is sunken is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of airflow web-forming machines, in particular to a downdraft air box for a non-woven fabric web-forming machine. Background Art

[0002] In non-woven fabric production, pre-treated fibers are made into non-woven fabrics after being conveyed, combed, formed, and wound. The forming of non-woven fabrics is generally carried out using a web-forming machine. In non-woven web-forming machines, a mesh curtain is used for support and transmission. The mesh curtain is a mesh structure with a certain strength and air permeability, which ensures that the fibers are evenly distributed during the web-forming process and forms a good fiber web. The downdraft box is set below the mesh curtain to effectively suck out the air from under the mesh curtain, thereby sucking away the air under the fibers and forming a stable fiber web. During forming, the fibers are conveyed to the mesh curtain, and the downdraft box generates negative pressure to suck away the air from under the fibers, so that the fibers fit tightly to the mesh curtain. In the design of the downdraft box, the adjustment of the air pressure has a significant impact on the forming quality of the non-woven fabric.

[0003] Regarding the wind pressure setting of the down-suction bellows, our company applied for a utility model application with application number CN202311298237.8 on October 9, 2023, named Down-suction Bellows for Non-woven Fabric Web Forming Machine. We have made a reasonable design for the air duct setting of the down-suction bellows, dividing the surface suction area into several areas in the width direction of the fiber. Each area corresponds to an air duct. By adjusting the wind pressure of the air duct, the wind pressure at each horizontal position in the suction box is kept consistent, thereby stabilizing the molding quality of the non-woven fabric.

[0004] However, this structure still has defects for the mesh curtain and the non-woven fibers formed on the mesh curtain. The down-suction bellows balances the wind force by designing a suction port guide at the suction position. Conventional suction port guides are usually perforated plates or mesh plates. When the down-suction bellows is working, if the wind pressure is too high, when the mesh curtain passes over the down-suction bellows, the excessive suction force below can easily over-suck the fibers, causing the fibers to be over-pressed against the mesh curtain, so that the mesh curtain made of the fiber mesh is also sucked by the negative pressure, and the mesh curtain is concave and deformed at the mesh and grid positions, affecting the normal forming operation of the non-woven fabric. However, if the wind force is lowered and the wind pressure is too low, it will not be possible to effectively create negative pressure on the upper mesh curtain, and the fibers cannot be tightly fitted to the mesh curtain, resulting in poor forming quality. Utility Model Content

[0005] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of the existing technology, the present invention provides a bottom suction box for a non-woven fabric web-forming machine, which effectively improves the negative pressure suction structure. When the net curtain passes through, it can ensure that the negative pressure is maintained under the net curtain, effectively absorb the fibers above, and maintain the plane tension of the net curtain to avoid the net curtain from sinking and deformation.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a down-suction air box for a non-woven web-forming machine, which is arranged below the mesh curtain and comprises a box body, a suction port is provided on the top of the box body, an air duct connected to the suction port is provided inside the box body, and a negative pressure suction mechanism is connected to the other end of the air duct; a guide plate is arranged above the suction port, and the upper edge of the guide plate is divided into several areas in the width direction of the non-woven fabric, and several air guide rods are arranged in parallel at intervals in each area, and the arrangement directions of the air guide rods in two adjacent areas intersect to form an angle.

[0007] In the above scheme, the guide plate is further improved to address the situation where the negative pressure suction from the air suction port may cause the net curtain and the fiber molding on the surface of the net curtain to sag and deform. The guide plate is divided into areas, and an air guide rod is designed in each area. When the negative pressure suction mechanism is working, the suction force not only forms a negative pressure below the net curtain, but also sucks the limit on the net curtain downward to shape it. Since the air guide rods in adjacent areas are arranged at an angle, the negative pressure in the adjacent areas is guided by the air guide rods. In the vertical direction, the net curtain above the adjacent area is subjected to a downward negative pressure suction force. In the horizontal direction, when the net curtain above the adjacent area is subjected to force, the direction of the force is guided by the air guide rod. The directions of the air guide rods in the adjacent areas are cross-angled. This cross-angle creates tension in the horizontal direction of the net curtain, which tightens the net curtain in the horizontal direction to keep it flat and will not sag due to the negative pressure suction from below.

[0008] Preferably, the guide plate is divided into two areas, and a number of wind guide rods are arranged in parallel at intervals on the guide plate of each area, and any wind guide rod in each area forms an angle with any wind guide rod in another area or the extension line of the wind guide rod.

[0009] Furthermore, the air guide rods of the two areas are symmetrically distributed relative to the dividing line of the areas. By symmetrical arrangement, the forces on both sides of the horizontal direction between the two areas can be kept stable, which is conducive to maintaining the tension balance and stability of the net curtain.

[0010] Furthermore, the wind guide rods corresponding to the two areas at the dividing line are connected to form an angle of 45°.

[0011] Furthermore, the angle opening direction is parallel to the mesh curtain plane and the opening direction is the same as the mesh curtain conveying direction.

[0012] Preferably, during installation of the guide plate, a mounting bar is fixed at the air intake of the box body corresponding to the area dividing the guide plate. The guide plate is positioned outside the air intake, and the air guide bar of the guide plate is pressed against the mounting bar. The mounting bar provides a height limit for the upper guide plate and provides stable support at the dividing position, which is more conducive to maintaining stable tension of the net curtain and preventing it from sagging or deformation.

[0013] The beneficial effect of the present invention is that the downward suction box for a non-woven web-forming machine provided by the present invention has a simple and reasonable structural design. A guide plate is provided at the air suction port, and the guide plate is designed with an angled air guide rod along the direction of travel of the net curtain. The angled opening direction of the air guide rod is consistent with the direction of travel of the net curtain. As a result, when the net curtain passes over the air suction port, the negative pressure suction force at the two corners of the air guide rod forms a reverse direction on the plane of the net curtain, causing the net curtain to be forced to open along the two corner edges, thereby ensuring the tension of the net curtain in the plane direction, allowing it to pass through the air suction port stably, and preventing it from sagging and affecting the molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] Figure 2 It is a side view of the present utility model.

[0017] Figure 3 yes Figure 2 Cross-sectional view of AA in the figure.

[0018] Figure 4 It is a top view of the present utility model.

[0019] Figure 5 yes Figure 1 Enlarged schematic diagram of point B in the middle.

[0020] In the figure, 1, guide plate 2, box body 3, air duct 4, air suction port 5, air guide rod 6, and installation lever. DETAILED DESCRIPTION

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention only in a schematic manner. Therefore, they only show components relevant to the present invention, and directions and references (e.g., up, down, left, right, etc.) may be used solely to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0022] Example 1:

[0023] like Figure 1 The down-suction air box for a non-woven web-forming machine shown in the figure is the first embodiment of the present utility model.

[0024] like Figure 2 and Figure 3As shown, the downdraft air box is located below the net curtain and includes a housing 2. A suction port 4 is located at the top of the housing 2. An air duct 3 is located within the housing 2 and connected to the suction port 4. The other end of the air duct 3 is connected to a negative pressure suction mechanism. A guide plate 1 is located above the suction port 4 and is positioned outside the suction port 4.

[0025] like Figure 4 As shown, the guide plate 1 is divided into two equal zones along the width of the nonwoven fabric. Several air guide rods 5 are arranged in parallel and at intervals on the guide plate 1 in both zones. The air guide rods 5 in the two zones are symmetrically distributed about the dividing line between the zones. At the dividing line, the air guide rods 5 corresponding to the two zones are connected to form an angle. The opening direction of the angle is parallel to the plane of the mesh curtain and is in the same direction as the mesh curtain's conveying direction. The angle is preferably 45°.

[0026] The provision of the air guide rod 5, on the one hand, plays the role of the original perforated plate or mesh plate in the downdraft box, effectively uniformizing the negative pressure suction. On the other hand, the design of the air guide rod 5 in two symmetrically distributed areas on the guide plate 1 can also exert a certain tension on the net curtain, making its surface smooth and preventing it from being dented by the negative pressure.

[0027] With this symmetrical arrangement of zones, when the negative pressure suction mechanism is operating, the net curtain passes over the air intake 4, creating a negative pressure below the net curtain, sucking the air downward to set the limiter on the net curtain. Furthermore, due to the symmetrical distribution of the air guide rods 5 in the two zones, the negative pressure in the adjacent zones is guided by the air guide rods 5. Vertically, the net curtain above the adjacent zone experiences a downward negative pressure suction. Horizontally, when the net curtain above the two zones is subjected to force, the force is directed by the air guide rods 5, with the air guide rods 5 in the adjacent zones intersecting at a 45° angle. This intersecting angle creates horizontal tension on the net curtain, along the direction of transport and diagonally outward toward both sides of the transport direction. This symmetrical tension tightens the net curtain horizontally, effectively maintaining a flat surface under the action of negative pressure and preventing it from sag due to the negative pressure from below.

[0028] Example 2:

[0029] like Figure 1 and Figure 5 The shown down-suction air box for a non-woven web-forming machine is the second embodiment of the present invention. Based on the first embodiment, the second embodiment further designs the installation of the guide plate 1.

[0030] Specifically, such as Figure 5 As shown, during the installation of the guide plate 1, a mounting lever 6 is fixed at the area dividing position of the air suction port 4 of the box body 2 corresponding to the guide plate 1. The guide plate 1 is sheathed outside the air suction port 4, and the air guide rod 5 of the guide plate 1 is crimped onto the top of the mounting lever 6. The mounting lever 6 provides a height limit for the upper guide plate 1.

[0031] For the wind guide rods 5 in the two side areas, the downward suction force generated by the negative pressure suction mechanism is divided into two parts by the mounting bar 6. The mounting bar 6 not only supports the upper guide plate 1, but also provides further regional separation for the wind guide rods 5, which is more conducive to maintaining stable tension of the net curtain and preventing it from sagging or deformation.

[0032] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A down-suction air box for a non-woven web-forming machine, arranged below a net curtain, comprising a box body (2), characterized in that: The top of the box body (2) is provided with an air suction port (4), an air duct (3) connected to the air suction port (4) is provided inside the box body (2), and the other end of the air duct (3) is connected to a negative pressure suction mechanism; A guide plate (1) is arranged above the air suction port (4), and the guide plate (1) is divided into several areas along the width direction of the non-woven fabric. Several air guide rods (5) are arranged in parallel at intervals in each area, and the arrangement directions of the air guide rods (5) in two adjacent areas intersect to form an angle.

2. The down-suction air box for a nonwoven web-forming machine according to claim 1, characterized in that: The guide plate (1) is divided into two areas, and a plurality of wind guide rods (5) are arranged in parallel at intervals on the guide plate (1) of each area. Any wind guide rod (5) in each area forms an angle with any wind guide rod (5) in another area or the extension line of the wind guide rod (5).

3. The down-suction air box for a nonwoven web-forming machine according to claim 2, characterized in that: The air guide rods (5) of the two areas are symmetrically distributed relative to the dividing line of the areas.

4. The down-suction air box for a nonwoven web-forming machine according to claim 3, wherein: The wind guide rods (5) corresponding to the two areas at the dividing line are connected to form an angle of 45 degrees.

5. The down-suction air box for a nonwoven web-forming machine according to claim 4, characterized in that: The angle opening direction is parallel to the mesh curtain plane and the opening direction is the same as the mesh curtain conveying direction.

6. The down-suction air box for a nonwoven web-forming machine according to claim 2, characterized in that: A mounting lever (6) is fixed at the area dividing position of the air inlet (4) of the box body (2) corresponding to the guide plate (1); the guide plate (1) is sheathed outside the air inlet (4); and the air guide rod (5) of the guide plate (1) is pressed onto the mounting lever (6).

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