Sleeve type side blowing drafting tube for tubular drafting

Abstract

The utility model discloses a sleeve type side blowing drafting tube for tubular drafting, and relates to the technical field of non-woven fabric production equipment, in particular to the sleeve type side blowing drafting tube for tubular drafting. A sleeve is sleeved outside a 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 structure is formed between the sleeve and the drafting pipe; a plurality of through holes are formed in the pipe wall of the drafting pipe and located in the static pressure cabin, so that the interior of the drafting pipe is communicated with the static pressure cabin; the connecting piece is connected with a pipeline of an external air source, and air can be conveniently supplied into the static pressure cabin. 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 air-blowing drafting tube for tubular drafting, which relates to the technical field of nonwoven fabric production equipment, and in particular to a sleeve-type side air-blowing 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-blowing 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 cloud spots of the non-woven fabric products are large and the uniformity is poor. A sleeve-type side-blowing drafting tube for tubular drafting is provided. The utility model mainly uses an external pressure system to blow air into the drafting tube through the static pressure bin and the through holes on the drafting tube. The fiber bundle will be subjected to the impact force of 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 fiber 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-blowing drafting tube for tubular drafting, comprising a tubular drafter and a drafting tube arranged at the lower part of the tubular drafter;

[0007] Further, the outside of the drafting tube is sheathed with a sleeve;

[0008] Furthermore, the upper and lower ends of the sleeve are closedly connected to the drafting tube, so that a static pressure cabin structure is formed between the sleeve and the drafting tube;

[0009] Furthermore, a plurality of through holes are provided on the tube wall of the drafting tube, and the through holes are located in the static pressure cabin, so that the interior of the drafting tube is communicated with the static pressure cabin;

[0010] Furthermore, a connecting piece is provided on the sleeve;

[0011] Furthermore, the connecting piece is connected to a pipeline of an external air source to facilitate air supply to the static pressure cabin.

[0012] Furthermore, the through holes are arranged on the drawing tube in an interval and relative manner from top to bottom.

[0013] Furthermore, the through holes are arranged on the drafting tube in a spiral distribution form from top to bottom.

[0014] Further, the through hole is arranged on the drafting tube in a horizontal form;

[0015] Furthermore, the through hole is arranged on the drafting tube in a downwardly inclined form.

[0016] Furthermore, an external air source applies positive pressure to the interior of the static pressure chamber, and blows air into the interior of the drafting tube through the through hole, thereby changing the direction of the fiber bundle in the drafting tube.

[0017] The working process of the utility model is:

[0018] The external air source of the utility model adopts a compressed air source or a fan air source;

[0019] When positive pressure needs to be applied to the drafting tube, compressed air is input into the static pressure chamber or air is blown into the static pressure chamber by a fan. The compressed air or air from the fan passes through the through holes on the static pressure chamber and the drafting tube and blows into the inside of the drafting tube. The positive pressure wind force blown in blows the fiber bundle from the opposite side of the middle of the drafting tube; the positive pressure wind force blown in from the upper and lower adjacent through holes blows the fiber bundle to the side or in the opposite direction, thereby solving the problem of uniformity of fiber filaments inside and outside the fiber bundle.

[0020] Different product uniformity can be obtained by adjusting different wind pressures according to different fiber bundle conditions.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] 1. The sleeve-type side-blowing drafting tube for tubular drafting provided by the utility model blows external high-pressure gas into the drafting tube through the sleeve and the connecting piece, so that the high-pressure airflow applied by the drafting device to the drafting tube exerts downward pressure and friction 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;

[0023] 2. The sleeve-type side-blowing 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 by blowing air into the drafting tube while ensuring the same drafting effect.

[0024] In summary, the technical solution of the utility model solves the problems of the existing tubular stretcher and stretching method in the prior art, which require 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 uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the structure of the utility model in which through holes are arranged horizontally and spaced apart on the wall of the drawing tube;

[0027] Figure 2 The utility model is Figure 1 AA view;

[0028] Figure 3 This is a schematic diagram of the structure of the utility model in which the through hole is spirally arranged on the drawing tube wall in a horizontal form;

[0029] Figure 4 The utility model is Figure 3 BB view;

[0030] Figure 5 This is a schematic diagram of the structure of the utility model in which the through holes are arranged at intervals on the wall of the drawing tube in a downwardly inclined form;

[0031] Figure 6 The utility model is Figure 5 CC view;

[0032] Figure 7 This is a schematic diagram of the structure of the utility model in which the through hole is spirally arranged on the drawing tube wall in a downwardly inclined form;

[0033] Figure 8 The utility model is Figure 7 DD view;

[0034] Fig. 9 It is a schematic diagram of the distribution of fibers in the drafting tube of the existing drafting device;

[0035] Fig.10 It is a schematic diagram of the stress condition of a single fiber in a drafting tube;

[0036] Fig.11 This is a schematic diagram of the distribution of the horizontal blown fibers in the drafting tube of the utility model;

[0037] Fig.12 It is a schematic diagram of the force applied to a single fiber blown horizontally in the drafting tube of the utility model;

[0038] Fig.13 This is a schematic diagram of the distribution of the downwardly inclined blown fibers in the drafting tube of the utility model;

[0039] Fig.14 This is a schematic diagram of the distribution of the downwardly inclined blown fibers in the drafting tube of the utility model.

[0040] In the figure: 1, drawing tube 2, sleeve 3, through hole 4, connecting piece 5, fiber bundle. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] Example 1

[0049] like Figure 1 , 2 As shown, the utility model provides a sleeve-type side-blowing drafting tube for tubular drafting, comprising a tubular drafter and a drafting tube 1 arranged at the lower part of the tubular drafter; a sleeve 2 is sleeved on the outside of the drafting tube 1; the upper and lower ends of the sleeve 2 are closedly connected with the drafting tube 1, so that a static pressure cabin structure is formed between the sleeve 2 and the drafting tube 1; a plurality of through holes 3 are arranged on the tube wall of the drafting tube 1, and the through holes 3 are located in the static pressure cabin, so that the inside of the drafting tube 1 is communicated with the static pressure cabin; a connecting piece 4 is arranged on the sleeve 2; the connecting piece 4 is connected to the pipeline of the external air source, so as to facilitate the air supply to the static pressure cabin.

[0050] The through holes 3 are arranged on the drawing tube 1 in an interval and relative manner from top to bottom.

[0051] The through hole 3 is arranged horizontally on the drawing tube 1;

[0052] The external air source applies positive pressure to the inside of the static pressure chamber, and blows air into the drawing tube 1 through the through hole 3, thereby changing the direction of the fiber bundle 5 in the drawing tube 1 and increasing the drawing speed, or reducing the compressed air pressure for drawing while keeping the drawing speed unchanged.

[0053] Example 2

[0054] like Figure 3 , 4As shown, based on Example 1, the utility model also provides a sleeve-type side-blowing drafting tube for tubular drafting;

[0055] The through holes 3 are arranged on the drawing tube 1 in a spiral distribution from top to bottom.

[0056] The through hole 3 is arranged horizontally on 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-blowing drafting tube for tubular drafting;

[0059] The through holes 3 are arranged on the drawing tube 1 in an interval and relative manner from top to bottom.

[0060] The through hole 3 is arranged on the drawing tube 1 in a downwardly inclined manner.

[0061] Example 4

[0062] like Figure 7 , 8 As shown, based on Example 1, the utility model also provides a sleeve-type side-blowing drafting tube for tubular drafting;

[0063] The through holes 3 are arranged on the drawing tube 1 in a spiral distribution from top to bottom.

[0064] The through hole 3 is arranged on the drawing tube 1 in a downwardly inclined manner.

[0065] 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-blowing 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: The outside of the drawing tube (1) is sheathed with a sleeve (2); The upper and lower ends of the sleeve (2) are closedly connected to the drafting tube (1), so that a static pressure chamber structure is formed between the sleeve (2) and the drafting tube (1); A plurality of through holes (3) are provided on the wall of the drafting tube (1), and the through holes (3) are located in the static pressure chamber, so that the interior of the drafting tube (1) is in communication with the static pressure chamber; The sleeve (2) is provided with a connecting piece (4); The connecting piece (4) is connected to a pipeline of an external air source, so as to facilitate air supply to the static pressure cabin.

2. The sleeve-type side-blowing drafting tube for tubular drafting according to claim 1, characterized in that: The through holes (3) are arranged on the drawing tube (1) in an interval and relative manner from top to bottom.

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

4. The sleeve-type side-blowing drafting tube for tubular drafting according to claim 1, characterized in that: The through hole (3) is arranged on the drawing tube (1) in a horizontal manner.

5. The sleeve-type side-blowing drafting tube for tubular drafting according to claim 1, characterized in that: The through hole (3) is arranged on the drawing tube (1) in a downwardly inclined manner.

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