Sleeve type side air suction drafting tube for tubular drafting

Abstract

The utility model relates to the technical field of non-woven fabric production equipment, in particular to a sleeve type side air suction drafting tube for tubular drafting. A plurality of air suction holes are formed in the pipe wall of a drafting pipe; a sleeve is sleeved outside the drafting tube; the upper end and the lower end of the sleeve are in closed connection with the drafting pipe, so that a static pressure cabin is formed between the sleeve and the drafting pipe; the suction hole is positioned in the static pressure cabin; a connecting piece communicated with the static pressure cabin is arranged on the sleeve; and the connecting piece is connected with a pipeline of external negative pressure equipment. According to the technical scheme, the problems that in an existing tubular drafting device and an existing drafting method in the prior art, needed compressed air is high in pressure, large in flow and high in energy consumption; meanwhile, the performance difference between inner fibers and outer fibers of fiber bundles is large, and non-woven fabric products are large in cloud spots and poor in uniformity.

Description

Technical Field

[0001] The utility model discloses a sleeve-type side suction drafting tube for tubular drafting, which relates to the technical field of nonwoven fabric production equipment, and in particular to a sleeve-type side suction drafting tube for tubular drafting. Background Art

[0002] Tubular air drafting uses air jets to move the fibers forward. The working principle of the existing tubular drafting method is: compressed air is connected to the air drafter to form a high-speed jet airflow at the annular nozzle of the drafter. The high-speed jet airflow generates friction on the fiber bundle. Relying on the friction, the compressed air drives the fibers to move together, so that the fiber bundle is axially stretched. However, the existing tubular air drafting method only relies on the friction generated by the high-speed jet airflow on the fiber bundle for drafting, which has the defects of high compressed air pressure, large flow rate and high energy consumption. The fibers are in a clustered state inside the drafting tube, and multiple fibers are concentrated in the center of the drafting tube. The fibers close to the outer layer have a high compressed air speed around them, and are subject to large friction and high drafting speed. The fibers in the middle have a relatively low compressed air speed around them, and are subject to small friction and low drafting speed. In this way, the fibers in the outer layer are fully drafted, with high strength, small elongation and good thermal stability. The fibers in the inner layer are not fully drafted, with low strength, large elongation and poor thermal stability, and the performance of the fibers after drafting is very different. At the same time, in order to ensure that the fibers are fully stretched, high compressed air flow and pressure are required, so that the compressed air speed at the outlet of the stretching tube is also high. The high-speed compressed air flow will impact the fiber web, easily causing the web to flip, making the nonwoven fabric have large cloud spots and poor uniformity.

[0003] In view of the problems existing in the above-mentioned prior art, it is very necessary to study and design a new type of sleeve-type side suction drafting tube for tubular drafting, so as to overcome the problems existing in the prior art. Summary of the invention

[0004] According to the existing tubular drafting device and drafting method proposed in the above-mentioned prior art, there are technical problems such as high compressed air pressure, large flow rate, and high energy consumption; at the same time, the performance difference of the fibers inside and outside the fiber bundle is large, and the non-woven fabric product has large cloud spots and poor uniform shape. A sleeve-type side suction drafting tube for tubular drafting is provided. The utility model mainly utilizes an external negative pressure system to suck air into the drafting tube through the static pressure bin and the suction holes on the drafting tube. The filament bundle will be sucked by the compressed air from the air holes on the side of the drafting tube, so that the fibers will form a curve from top to bottom inside the drafting tube. The high-speed jet airflow of the drafting device will produce a top-to-bottom pressure thrust on the fibers at the curve, and at the same time, the high-speed jet airflow will produce friction on the filament bundle, so that the drafting speed is increased. In other words, while keeping the drafting speed unchanged, the compressed air pressure for drafting can be reduced, which plays a role in energy saving and consumption reduction.

[0005] The technical means adopted by the utility model are as follows:

[0006] A sleeve-type side suction drafting tube for tubular drafting, comprising a tubular drafter and a drafting tube arranged at the lower part of the tubular drafter;

[0007] Furthermore, a plurality of air suction holes are provided on the tube wall of the drawing tube;

[0008] Further, the outside of the drafting tube is sheathed with a sleeve;

[0009] Furthermore, the upper and lower ends of the sleeve are closedly connected to the drafting tube, so that a static pressure chamber is formed between the sleeve and the drafting tube;

[0010] Further, the air intake hole is located in the static pressure cabin, so that the interior of the drafting tube is connected to the static pressure cabin through the air intake hole;

[0011] Furthermore, a connecting piece communicating with the static pressure chamber is provided on the casing;

[0012] Furthermore, the connecting piece is connected to a pipeline of an external negative pressure device, so as to facilitate suction of the drawing tube through the static pressure chamber.

[0013] Furthermore, the air suction holes are arranged on the tube wall of the drawing tube in an interval-relative manner from top to bottom.

[0014] Furthermore, the air suction holes are arranged on the tube wall of the drawing tube in a spiral distribution form from top to bottom.

[0015] Furthermore, the air suction holes are arranged horizontally on the tube wall of the drawing tube.

[0016] Furthermore, the suction pipe is arranged on the pipe wall of the drawing pipe in an upwardly inclined manner.

[0017] Furthermore, the external negative pressure device applies negative pressure to the inside of the static pressure cabin, and applies negative pressure to the inside of the drafting tube through the suction hole, thereby changing the direction of the fiber bundle in the drafting tube.

[0018] The working process of the utility model is:

[0019] The external air source of the utility model adopts a negative pressure device or a fan air source;

[0020] When negative pressure needs to be applied to the drawing tube, the negative pressure device is turned on or the fan air source is turned on in reverse, and the gas in the drawing tube is extracted outward through the suction hole and the internal cavity of the static pressure bin. The negative pressure at the suction hole generates a suction force on the fiber bundle toward the suction hole. The negative pressure wind force sucked out by the horizontal or inclined suction hole sucks the fiber bundle to the side or in the opposite direction to increase the friction and accelerate the running speed of the fiber bundle.

[0021] Different product uniformity can be obtained by adjusting different negative pressures according to different fiber bundle conditions.

[0022] Compared with the prior art, the utility model has the following advantages:

[0023] 1. The utility model provides a sleeve-type side suction drafting tube for tubular drafting. The external negative pressure device or fan draws the gas in the drafting tube outward, so that the high-pressure airflow applied by the drafting device to the drafting tube exerts a downward pressure thrust and friction force on the fiber bundle, thereby increasing the movement speed of the fiber bundle, or reducing the pressure of the compressed air for drafting while keeping the running speed of the fiber bundle unchanged;

[0024] 2. The sleeve-type side suction drafting tube for tubular drafting provided by the utility model can reduce the pressure and flow rate of the compressed air for drafting, reduce the air flow velocity of the compressed air at the outlet of the drafting tube, reduce the web flipping caused by the impact of the compressed air flow on the fiber web, reduce the occurrence of cloud spots, and improve the uniformity of non-woven fabric products while ensuring the same drafting effect.

[0025] In summary, the technical solution of the utility model solves the problems in the prior art of large performance differences between the inner and outer fibers of the fiber bundle, large cloud spots and poor uniformity of non-woven fabric products, and large compressed air flow and high pressure required by the drafting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0028] Figure 2 This is a cross-sectional view of the drawing tube of Example 1 of the utility model;

[0029] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;

[0030] Figure 4 This is a cross-sectional view of the drafting tube of Embodiment 2 of the utility model;

[0031] Figure 5 This is a schematic diagram of the structure of Embodiment 3 of the present utility model;

[0032] Figure 6 This is a cross-sectional view of the drafting tube of Example 3 of the utility model;

[0033] Figure 7 This is a schematic diagram of the structure of Embodiment 4 of the present utility model;

[0034] Figure 8 This is a cross-sectional view of the drafting tube of Example 4 of the utility model;

[0035] Fig. 9 A schematic diagram of the distribution of fibers in a drafting tube of an existing drafting device;

[0036] Fig.10 It is a schematic diagram of the force condition of a single fiber in a drafting tube of an existing drafting device;

[0037] Fig.11 This is a schematic diagram of the distribution of fibers in the drafting tube (the suction holes are arranged horizontally) of the utility model;

[0038] Fig.12 This is a schematic diagram of the force situation inside a single fiber drafting tube (with the air suction hole arranged horizontally) of the utility model;

[0039] Fig.13 This is a schematic diagram of the distribution of fibers in the drafting tube (the suction holes are inclined) of the utility model;

[0040] Fig.14 It is a schematic diagram of the stress condition inside a single fiber drafting tube (with the air suction hole arranged obliquely) of the utility model.

[0041] In the figure: 1, drawing tube 2, suction hole 3, sleeve 4, static pressure chamber 5, connecting piece 6, fiber bundle. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings 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. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0046] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0049] Example 1

[0050] like Figure 1 , 2 As shown, the utility model provides a sleeve-type side-suction drafting tube for tubular drafting, comprising a tubular drafter and a drafting tube 1 arranged at the lower part of the tubular drafter; a plurality of suction holes 2 are arranged on the tube wall of the drafting tube 1; a sleeve 3 is sleeved on the outside of the drafting tube 1; the upper and lower ends of the sleeve 3 are closedly connected with the drafting tube 1, so that a static pressure chamber 4 is formed between the sleeve 3 and the drafting tube 1; the suction hole 2 is located in the static pressure chamber 4, so that the inside of the drafting tube 1 is connected with the static pressure chamber 4 through the suction hole 2; a connector 5 communicating with the static pressure chamber 4 is arranged on the sleeve 3; the connector 5 is connected to the pipeline of the external negative pressure equipment, so that the drafting tube 1 is suctioned through the static pressure chamber 4.

[0051] The air suction holes 2 are arranged on the tube wall of the drawing tube 1 in an interval-opposite manner from top to bottom.

[0052] The air suction hole 2 is horizontally arranged on the tube wall of the drawing tube 1 .

[0053] The external negative pressure device applies negative pressure to the inside of the static pressure chamber 4, and applies negative pressure to the inside of the drawing tube 1 through the air intake hole 2, thereby changing the direction of the fiber bundle 6 in the drawing tube 1 and increasing the drawing speed, or reducing the pressure or flow of the compressed air for drawing while keeping the drawing speed unchanged.

[0054] Example 2

[0055] like Figure 3 , 4 As shown, (based on Example 1,) the utility model also provides a sleeve-type side suction drawing tube for tubular drawing, and the suction holes 2 are arranged on the tube wall of the drawing tube 1 in a spiral distribution form from top to bottom.

[0056] The air suction hole 2 is horizontally arranged on the tube wall of the drawing tube 1 .

[0057] Example 3

[0058] like Figure 5 , 6 As shown, (based on Example 1,) the utility model also provides a sleeve-type side suction drawing tube for tubular drawing, and the suction holes 2 are arranged on the tube wall of the drawing tube 1 in a spaced relative manner from top to bottom.

[0059] The suction pipe 2 is arranged on the pipe wall of the drawing pipe 1 in an upwardly inclined manner.

[0060] Example 4

[0061] like Figure 7 , 8 As shown, (based on Example 1,) the utility model also provides a sleeve-type side suction drawing tube for tubular drawing, and the suction holes 2 are arranged on the tube wall of the drawing tube 1 in a spiral distribution form from top to bottom.

[0062] The suction pipe 2 is arranged on the pipe wall of the drawing pipe 1 in an upwardly inclined manner.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A sleeve-type side suction drafting tube for tubular drafting, comprising a tubular drafter and a drafting tube (1) arranged at the lower part of the tubular drafter; characterized in that: A plurality of air suction holes (2) are provided on the wall of the drawing tube (1); The drafting tube (1) is sheathed with a sleeve (3) on its exterior; The upper and lower ends of the sleeve (3) are closedly connected to the drafting tube (1), so that a static pressure chamber (4) is formed between the sleeve (3) and the drafting tube (1); The air intake hole (2) is located in the static pressure chamber (4), so that the interior of the drafting tube (1) is connected to the static pressure chamber (4) through the air intake hole (2); The sleeve (3) is provided with a connecting piece (5) which is in communication with the static pressure chamber (4); The connecting piece (5) is connected to the pipeline of the external negative pressure equipment, so as to facilitate the suction of the drawing tube (1) through the static pressure chamber (4).

2. The sleeve-type side suction drafting tube for tubular drafting according to claim 1, characterized in that: The air suction holes (2) are arranged on the tube wall of the drawing tube (1) in an interval-relative manner from top to bottom.

3. The sleeve-type side suction drafting tube for tubular drafting according to claim 1, characterized in that: The air suction holes (2) are arranged on the tube wall of the drawing tube (1) in a spiral distribution from top to bottom.

4. The sleeve-type side suction drafting tube for tubular drafting according to claim 2 or 3, characterized in that: The air suction hole (2) is arranged horizontally on the tube wall of the drawing tube (1).

5. The sleeve-type side suction drafting tube for tubular drafting according to claim 2 or 3, characterized in that: The air suction hole (2) is arranged on the tube wall of the drawing tube (1) in an upwardly inclined manner.

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