CN209854449U - Novel head box - Google Patents

Abstract

The utility model discloses a novel head box, including air cushion chamber body, turbulence generator, air cushion chamber body top is provided with the top cap, the structure is the wallboard around the air cushion chamber body, be provided with the overflow mouth on the wallboard, air cushion chamber body lower part is link up with the mixing chamber through the gap, turbulence generator is connected with the mixing chamber, turbulence generator includes the rectangular pipe, crosses cab apron, pipe, backup pad, be provided with the backup pad through-hole corresponding with the pipe in the backup pad, the backup pad through-hole links with the pipe entry end, cross cab apron one end and be provided with the pipe through-hole that corresponds with the pipe, cross the cab apron other end and be provided with the rectangle through-hole that corresponds with the rectangular pipe, excessive board pipe through-hole and pipe exit end hookup, cross cab apron rectangle through-hole and rectangular pipe entry end and link. The utility model discloses a novel head box has that thick liquids dispersion is even does not have the flocculation, characteristics such as the finished paper uniformity is good.

Description

Novel head box

Technical Field

The utility model relates to a papermaking equipment technical field, more specifically relates to a novel head box.

Background

The existing hydraulic pulp flow box has a completely closed internal structure, pulp pulse and generated bubbles caused by a flow system cannot be eliminated and released, so that pulp spraying at the lip opening of the pulp flow box of the paper machine forms longitudinal quantitative regular fluctuation and the bubbles break to destroy the uniformity of paper.

Disclosure of Invention

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the utility model is to provide a novel head box, this novel head box has that the thick liquids dispersion is even does not have the flocculation, characteristics such as the finished paper uniformity is good.

The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a novel head box, includes air cushion chamber body, turbulence generator, air cushion chamber body top is provided with the top cap, the structure is the wallboard all around for the air cushion chamber body, be provided with the overflow mouth on the wallboard, air cushion chamber body lower part link up with the mixing chamber through the gap, turbulence generator is connected with the mixing chamber, turbulence generator includes the rectangular pipe, crosses cab apron, pipe, backup pad, be provided with the backup pad through-hole corresponding with the pipe in the backup pad, the backup pad through-hole links with the pipe entry end, it is provided with the pipe through-hole that corresponds with the pipe to cross cab apron one end, it is provided with the rectangle through-hole that corresponds with the rectangular pipe to cross the cab apron other end, excessive pipe board through-hole and pipe exit end hookup, it links with the rectangular pipe entry end to cross cab.

Further, the width of the through gap of the air cushion chamber body is 40 mm.

Further, the number of the overflow ports is 1.

Further, the thickness of the supporting plate is 50 mm.

Further, the length of the round tube is 125 mm.

Further, the length of the rectangular tube is 120 mm.

Further, the round pipe is a pipe bundle round pipe.

Furthermore, the number of the tube bundle circular tubes is multiple.

Furthermore, the number of the rectangular tubes is multiple.

The beneficial effects of the utility model are that: a novel flow box eliminates the longitudinal fluctuation of a flow feeding system to the flow box, and the longitudinal quantitative fluctuation of paper sheets is obviously improved. Meanwhile, the influence caused by the bubbles in the pulp and the rotten pulp on the paper making of the paper machine is solved.

The pulp is in a turbulent state by the turbulence generator, the pulp is uniformly dispersed without flocculation, and the paper formation uniformity is good. The size passing through the turbulence generator meets the length of the initial group of the outlet, so that the banner is uniformly distributed with small banner quantitative difference.

Drawings

FIG. 1 is a schematic cross-sectional structural view of a novel headbox of the present invention;

fig. 2 is a schematic cross-sectional view of a novel turbulence generator according to the present invention;

fig. 3 is a schematic side view of a novel turbulence generator according to the present invention;

fig. 4 is a schematic cross-sectional structural view of an air cushion chamber of a novel headbox of the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

1. an air cushion chamber body; 2. a mixing chamber; 3. a gap; 4. a wallboard; 5. a top cover; 6. an overflow port; 11. a rectangular tube; 12. a transition plate; 13. a circular tube; 14. a support plate; 100. a head box; 200. a turbulence generator.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1-4, the novel headbox 100 of the present embodiment includes an air cushion chamber body 1, a turbulence generator 200, a top cover 5 is disposed on the top of the air cushion chamber body 1, wall plates 4 are disposed around the air cushion chamber body 1, overflow ports 6 are disposed on the wall plates 4, the lower portion of the air cushion chamber body 1 is communicated with a mixing chamber 2 through a gap 3, the turbulence generator 200 is connected to the mixing chamber 2, the turbulence generator 200 comprises a rectangular pipe 11, a transition plate 12, a circular pipe 13 and a support plate 14, wherein a support plate through hole corresponding to the circular pipe 13 is formed in the support plate 14, the support plate 14 through hole is connected with the circular pipe inlet end, a circular pipe through hole corresponding to the circular pipe 13 is formed in one end of the transition plate 12, a rectangular through hole corresponding to the rectangular pipe 11 is formed in the other end of the transition plate 12, the circular pipe through hole of the transition plate 12 is connected with the circular pipe outlet end, and the rectangular through hole of the transition plate 12 is connected with the rectangular pipe 11 inlet end.

The novel air cushion chamber body 1 in the headbox of the embodiment has a through gap 3 with a width of 40 mm.

The number of overflow openings 6 in the novel headbox of this example is 1.

The thickness of the support plate 14 in the new headbox of this example is 50 mm.

The length of the round tube 13 in the novel headbox of this example is 125 mm.

The length of the rectangular tube 11 in the novel headbox of this example is 120 mm.

The novel inner pipe 13 of the headbox is a tube bundle pipe.

The number of the tube bundle round tubes in the novel head box is multiple.

The number of the rectangular tubes 11 in the novel headbox of the present embodiment is multiple.

The air cushion chamber body theory of operation:

the slurry in the mixing chamber overflows through the slits 3 in the air cushion chamber, the overflow channels constituting the manifolds in the acoustic model. The air cushion chamber is communicated with the mixing chamber through a gap 3 with a certain width of 35-45mm in the transverse direction of the flow box. The slurry in the mixing chamber overflows the air cushion chamber through the gap to direct the pulse to the air cushion chamber. The effect is the best when the gap width is 40mm, and in the experimental process, the gap width is very sensitive to pulse reduction and is less than 40mm, and the pulse intensity is not completely released; if the diameter is more than 40mm, the pulse effect is obvious, but the consistency of the pulp flow is obviously damaged.

Besides the function of attenuating pressure pulses, bubbles and the rotten pulp with lighter specific gravity mixed in the pulp can be removed through overflow by means of an overflow channel in the air cushion chamber, the indexes and the appearances of final products before and after use are compared in the experimental process of equipment, and the semitransparent patches of the paper sheets and the holes formed by the rotten pulp are obviously reduced due to the bubbles.

The working principle of the turbulence generator is as follows:

slurry is sprayed out from the mixing chamber 2 through the supporting plate 14, the circular tube 13 and the rectangular tube 11 in sequence, in a short area close to a nozzle, a shear layer is formed due to the speed difference of fluid in a jet fluid and a turbulence generator, a vortex is formed due to the rapid growth of natural instability of the shear layer, and a jet set has stronger turbulence pulsation compared with a single-strand jet just due to stronger vortex between the jet fluids, so that the strong turbulence pulsation promotes the uniform mixing and fiber dispersion of the slurry in the turbulence generator, and simultaneously dissipates the kinetic energy of the slurry, thereby attenuating the pressure pulsation to a certain extent.

Because the turbulence generator is used for uniformly and stably delivering small stock flows from the mixing chamber to the convergence areas of the upper lip plate and the lower lip plate, the speed of the stock flows through the turbulence generator must reach a turbulent flow state, and the flow speed is more than 1.4 m/s.

The length of the rectangular tube of the turbulence generator is the initial length of the jet set. (data from a calculation formula for the initial length of the jet set). The length of the rectangular tube and the length of the circular tube and the width of the support plate ensure a friction area and a longer friction time. And the second and third stages of other turbulence generators are integrally manufactured by tube bundle reducing, the length of the reducing rectangle is not more than 40mm, and the length of the outlet end cannot meet the length of the initial group.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that various changes, modifications, substitutions and alterations can be made therein by those skilled in the art without departing from the scope of the present invention.

Claims (9)

1. The utility model provides a novel head box, a serial communication port, including air cushion chamber body, turbulence generator, air cushion chamber body top is provided with the top cap, the structure is the wallboard all around for the air cushion chamber body, be provided with the overflow mouth on the wallboard, air cushion chamber body lower part is link up with the mixing chamber through the gap, turbulence generator is connected with the mixing chamber, turbulence generator includes the rectangular pipe, crosses cab apron, pipe, backup pad, be provided with the backup pad through-hole corresponding with the pipe in the backup pad, and the backup pad through-hole links with the pipe entry end, cross cab apron one end and be provided with the pipe through-hole that corresponds with the pipe, cross the cab apron other end and be provided with the rectangle through-hole that corresponds with the rectangular pipe, excessive board pipe through-hole and pipe exit end hookup, cross cab apron rectangle through-hole and rectangular pipe.

2. The novel headbox of claim 1, wherein the air plenum body through gap width is 40 mm.

3. The headbox according to claim 1, characterised in that the number of overflow openings is 1.

4. The novel headbox according to claim 1, characterized in that the thickness of the support plate is 50 mm.

5. The headbox according to claim 1, characterized in that the length of said round tube is 125 mm.

6. The novel headbox of claim 1, characterized in that the rectangular tube has a length of 120 mm.

7. The headbox according to claim 1, characterized in that said round tubes are tube bundle round tubes.

8. The headbox according to claim 7, characterized in that said tube bundle comprises a plurality of tubes.

9. The headbox according to claim 1, characterized in that the number of said rectangular tubes is several.