CN115537700B

CN115537700B - Air knife

Info

Publication number: CN115537700B
Application number: CN202211052235.6A
Authority: CN
Inventors: 杜蓉; 李山青; 彭文杰; 周诗正; 杨芃; 王毅
Original assignee: Wuhan Iron and Steel Co Ltd
Current assignee: Wuhan Iron and Steel Co Ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2024-04-23
Anticipated expiration: 2042-08-30
Also published as: CN115537700A

Abstract

The application discloses an air knife, belongs to the technical field of hot dip plating processes, and aims to solve the technical problem that the existing air knife is uneven and unstable in air outlet. The air knife includes: the shell is provided with a containing cavity, an air inlet and an air outlet, and the air inlet is communicated with the air outlet; the fixing piece is connected with the shell and used for adjusting the opening area of the air outlet; the guide piece is arranged in the accommodating cavity and movably connected with the fixing piece, when the air flow flows in the accommodating cavity, the guide piece can be arranged along the air flow direction, so that the air in the accommodating cavity can flow out of the air outlet, wherein the air flow direction refers to the direction in which the air is blown from the air inlet to the air outlet. The angle and the position of the guide piece can be adjusted under the action of air flow, so that the guide piece can always flow along the air flow direction, the guide piece can always play a role in guiding, vortex street is avoided when air passes through the fixing piece, the guide effect can be achieved on the air passing through the fixing piece, and the uniformity and the stability of the air blown out from the air outlet are ensured.

Description

Air knife

Technical Field

The application belongs to the technical field of hot dip plating processes, and particularly relates to an air knife.

Background

The air knife is an important process device for hot galvanizing production, and has important influence on the quality of hot galvanizing products. In the continuous hot galvanizing production line, the air knife sprays continuous flat airflow like a knife by adopting a pair of slit-shaped nozzles which traverse the whole width of the strip steel, redundant zinc liquid on the surface of the strip steel is blown off, a uniform and proper zinc layer is left on the surface of the strip steel, and the zinc liquid is returned into a zinc pot, so that the aim of reasonably controlling the hot galvanizing zinc layer is fulfilled. The greater the air pressure blown out by the air knife, the stronger the zinc scraping capability of the air knife, and the smaller the thickness of the zinc layer on the surface of the strip steel. The surface quality defect of the hot dip galvanized product has strong correlation with the air knife, and the air flow of the air knife needs to have very good stability and uniformity, otherwise, the hot dip galvanized surface defect can be generated.

When the air knife of the related technology is used for hot dip coating production, the surface of the strip steel is easy to generate the situation of random local zinc layer thickening, and the reason is mainly because the air pressure blown out by the air knife is poor in uniformity and stability, so that the air pressure on the surface of the strip steel is uneven, and finally the defect of local zinc layer thickening is presented.

Disclosure of Invention

The application aims to solve the technical problems of uneven and unstable air outlet of the air knife to at least a certain extent. To this end, the application provides an air knife.

In a first aspect, an embodiment of the present application provides an air knife, including:

the shell is provided with a containing cavity, an air inlet and an air outlet, and the air inlet is communicated with the air outlet;

The fixing piece is connected with the shell and used for adjusting the opening area of the air outlet;

The air guide piece is arranged in the accommodating cavity and is movably connected with the fixing piece, when air flows in the accommodating cavity, the air guide piece can be arranged along the air flow direction, so that air in the accommodating cavity can flow out of the air outlet, and the air flow direction refers to the direction in which the air is blown from the air inlet to the air outlet.

In this embodiment, water conservancy diversion spare and mounting swing joint have under the circumstances that gas flows in the holding intracavity, and the water conservancy diversion spare can adjust self angle and position under the effect of air current, makes water conservancy diversion spare can flow along the air current direction all the time, can play the effect of water conservancy diversion all the time, avoids gas to produce vortex street when passing the mounting, can play the guide effect to the gas through the mounting to guarantee the homogeneity and the stability of the gas that blows out from the gas outlet.

In an alternative embodiment of the present application, the flow guiding member includes a flow guiding section and a connecting section that are fixedly connected to each other, and the connecting section is movably connected to the fixing member, so that the flow guiding section can be disposed along the air flow direction, so that the air in the accommodating cavity can flow out from the air outlet.

In an alternative embodiment of the present application, the connecting section has a connecting hole, the connecting hole is sleeved on the fixing member, the connecting section and the connecting hole are both circular, and the diameter of the connecting hole is larger than that of the fixing member.

In an alternative embodiment of the application, the difference between the diameter of the connecting hole and the diameter of the fixing element is less than or equal to 1mm.

In an alternative embodiment of the present application, the fixing member includes a mounting section and at least two fixing sections, the mounting section is disposed between two adjacent fixing sections, the diameter of the mounting section is smaller than that of the fixing sections, the connecting hole is sleeved on the mounting section, and the diameter of the connecting hole is larger than that of the mounting section and smaller than that of the fixing sections.

In an alternative embodiment of the present application, the air knife further includes an elastic member, one end of the elastic member is connected to the fixing member, and the other end of the elastic member is connected to the connecting section, so as to implement the movable connection between the flow guiding member and the fixing member.

In an alternative embodiment of the application, the connecting section is provided with a connecting hole, the connecting hole is sleeved on the fixing piece, and the elastic piece is arranged between the fixing piece and the hole wall of the fixing hole.

In an alternative embodiment of the present application, one end of the flow guiding section away from the connecting section has a flow guiding point, and the flow guiding point is disposed close to the air outlet.

In an alternative embodiment of the present application, the guide section includes a first guide surface and a second guide surface, one end of the first guide surface is connected to the fixed section, the other end is connected to the second guide surface, one end of the second guide surface away from the first guide surface is connected to one end of the connecting section away from the first guide surface, and the guide point is disposed at a connection position between the first guide surface and the second guide surface.

In an alternative embodiment of the present application, the fixing member is one of a drop type and a streamline type.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic structural diagram of an air knife according to an embodiment of the present invention.

Fig. 2 shows a schematic structural diagram of a flow guide of an air knife according to an embodiment of the present invention.

Fig. 3 is a flow field velocity distribution diagram of the air knife according to the embodiment of the present invention when the flow guide member is a drop type.

Fig. 4 shows a schematic structural view of another implementation of the air knife guide member according to the embodiment of the present invention.

Reference numerals: 100-air knife, 110-shell, 112-accommodating cavity, 114-air outlet, 116-first cover plate, 118-second cover plate, 130-fixing piece, 140-flow guiding piece, 142-flow guiding section, 142 a-flow guiding point, 142 b-first flow guiding surface, 142 c-second flow guiding surface, 144-connecting section, 146-connecting hole and 150-elastic piece.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all the directional indicators in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

When the air knife of the related technology is used for hot dip coating production, the surface of the strip steel is easy to generate the situation of random local zinc layer thickening, and the reason is mainly because the air pressure blown out by the air knife is poor in uniformity and stability, so that the air pressure on the surface of the strip steel is uneven, and finally the defect of local zinc layer thickening is presented. The air knife provided by the embodiment of the application can improve the problems, and can improve the uniformity and stability of the air pressure blown out by the air knife so as to improve the uniformity of a zinc layer on the surface of the strip steel.

The application is described below with reference to specific embodiments in conjunction with the accompanying drawings:

referring to fig. 1,2 and 3, the present embodiment provides an air knife 100, and the air knife 100 provided in the present embodiment can improve uniformity and stability of air pressure blown by the air knife 100, so as to improve uniformity of a zinc layer on a strip steel surface.

In the present embodiment, the air knife 100 includes:

a housing 110, the housing 110 having a receiving chamber 112, an air inlet and an air outlet 114, the air inlet and the air outlet 114 communicating;

A fixing member 130, the fixing member 130 being coupled to the housing 110 for adjusting an opening area of the air outlet 114;

The guiding element 140 is disposed in the accommodating cavity 112 and movably connected with the fixing element 130, so that the guiding element 140 can be disposed along the airflow direction when the airflow flows in the accommodating cavity 112, and the air in the accommodating cavity 112 can flow out from the air outlet 114, wherein the airflow direction indicates the direction in which the air is blown from the air inlet to the air outlet 114.

The casing 110 includes a first cover 116 and a second cover 118, where the first cover 116 and the second cover 118 are connected to form the accommodating cavity 112, the air outlet 114 is disposed at the connection position of the first cover 116 and the second cover 118, and the fixing member 130 is connected to the first cover 116 and the second cover 118 and disposed near the air outlet 114.

The accommodating chamber 112 of the housing 110 is surrounded by a first cover plate 116 and a second cover plate 118, the first cover plate 116 and the second cover plate 118 have a certain elasticity, the fixing members 130 are respectively connected with the first cover plate 116 and the second cover plate 118, and the opening area of the air outlet 114 can be adjusted through the fixing members 130. The fixing member 130 may be a screw, and the opening area of the air outlet 114 is adjusted by tightening or loosening the screw to adjust the air outlet amount of the air outlet 114.

Therefore, a certain included angle exists between the extending direction of the fixing member 130 and the air flow direction, even the vertical condition is reached, when the air flow passes through the fixing member 130, as the fixing member 130 is of a cylindrical structure, air can form vortex streets on the fixing member 130, so that the air flow speed is uneven, the fixing member 130 is provided with the flow guiding member 140 consistent with the air flow direction, when the air passes through the fixing member 130, the air can flow out along the extending direction of the flow guiding member 140, so that the air can continuously flow along the air flow direction, and the air can be blown out from the air outlet 114 quickly, thereby ensuring the speed and stability of the air blown out from the air outlet 114.

In this embodiment, the guiding element 140 is movably connected with the fixing element 130, under the condition that the gas flows in the accommodating cavity 112, the angle and the position of the guiding element 140 can be adjusted under the action of the gas flow, so that the guiding element 140 can always flow along the direction of the gas flow, the guiding effect can be always achieved, vortex street is avoided when the gas passes through the fixing element 130, the guiding effect can be achieved on the gas passing through the fixing element 130, and the uniformity and the stability of the gas blown out from the gas outlet 114 are ensured.

In this embodiment, the flow guiding element 140 includes a flow guiding section 142 and a connecting section 144 that are fixedly connected to each other, and the connecting section 144 is movably connected to the fixing element 130, so that the flow guiding section 142 can be disposed along the air flow direction, and the air in the accommodating cavity 112 can flow out from the air outlet 114.

The connecting section 144 is mounted on the fixing member 130 and movably connected with the fixing member 130, when the air flow passes through the fixing member 130, the air can quickly flow to the air outlet 114 under the flow direction of the flow guiding section 142 under the action of the air flow, so that the loss of the flow speed is reduced, and the uniformity and the stability of the air blown out from the air outlet 114 are improved.

In this embodiment, the connecting section 144 has a connecting hole 146, the connecting hole 146 is sleeved on the fixing member 130, the connecting section 144 and the connecting hole 146 are both circular, and the diameter of the connecting hole 146 is larger than that of the fixing member 130.

The connecting section 144 is sleeved on the fixing member 130, and the diameter of the connecting hole 146 is larger than that of the fixing member 130, so that a certain margin exists between the connecting hole 146 and the fixing member 130, when the air flows through the accommodating cavity 112, the connecting section 144 can move relative to the fixing member 130, the guide section 142 can be always arranged along the air flow direction, vortex street generated on the fixing member 130 by the air flow is reduced, and uniformity and stability of the air blown out from the air outlet 114 are improved.

In the present embodiment, the difference between the diameter of the connection hole 146 and the diameter of the fixing member 130 is less than or equal to 1mm.

Because the connecting section 144 is sleeved on the fixing member 130, the diameter difference between the connecting hole 146 and the fixing member 130 is not too large, if the aperture difference between the connecting section 144 and the fixing member 130 is too large, the connecting section 144 is easy to fall off from the fixing member 130, and the difference between the connecting section 144 and the fixing member is smaller than or equal to 1mm, so that the guide member 140 can be ensured to be sleeved under the condition of moving relative to the fixing member 130.

In this embodiment, the fixing member 130 includes a mounting section and at least two fixing sections, the mounting section is disposed between two adjacent fixing sections, the diameter of the mounting section is smaller than that of the fixing section, the connecting hole 146 is sleeved on the mounting section, and the diameter of the connecting hole 146 is larger than that of the mounting section and smaller than that of the fixing section.

The connecting section 144 is sleeved on the mounting section, and the diameter of the connecting hole 146 is smaller than that of the fixing section, so that the connecting section 144 can be clamped between two adjacent fixing sections, namely sleeved on the mounting section, and can move relative to the mounting section.

In other words, the difference between the diameter of the connecting hole 146 and the diameter of the mounting section is less than or equal to 1mm.

Referring to fig. 4, in this embodiment, a certain difference between the diameter of the connecting hole 146 and the diameter of the fixing member 130 is one way to achieve the movable connection between the guiding element 140 and the fixing member 130, and besides the storage, the connection may be further performed by the elastic member 150, which is specifically as follows: the air knife 100 may further include an elastic member 150, where one end of the elastic member 150 is connected to the fixing member 130, and the other end is connected to the connecting section 144, so as to implement the movable connection between the flow guiding member 140 and the fixing member 130.

Since the elastic member 150 has a certain elasticity, when the air flows in the accommodating cavity 112, the guiding member 140 can move relative to the fixing member 130 under the action of the elastic force of the elastic member 150, so that the guiding member 140 can be disposed along the air flow direction.

In the present embodiment, the connecting hole 146 is sleeved on the fixing member 130, and the elastic member 150 is disposed between the fixing member 130 and the wall of the connecting hole 146. One end of the elastic member 150 is connected to the peripheral wall of the fixing member 130, and the other end is connected to the wall of the connection hole 146.

In this embodiment, an end of the guiding section 142 away from the connecting section 144 has a guiding point 142a, and the guiding point 142a is disposed near the air outlet 114.

The flow guiding point 142a is the point of the flow guiding member 140 farthest from the axis of the fixing member 130 and closest to the air outlet 114, and the air passing through the fixing member 130 flows onto the flow guiding section 142 after passing through the connecting section 144, and finally leaves the whole flow guiding member 140 from the flow guiding point 142a and flows to the air outlet 114, so that the air can flow to the air outlet 114 in a concentrated manner.

In this embodiment, the flow guiding section 142 includes a first flow guiding surface 142b and a second flow guiding surface 142c, one end of the first flow guiding surface 142b is connected with the connecting section 144, the other end is connected with the second flow guiding surface 142c, one end of the second flow guiding surface far away from the first flow guiding surface 142b is connected with one end of the connecting section 144 far away from the first flow guiding surface 142b, and the flow guiding point 142a is disposed at the connection position of the first flow guiding surface 142b and the second flow guiding surface 142 c.

The first guide surface 142b and the second guide surface 142c extend from the connection section 144 to the guide point 142a, so that the first guide surface 142b and the second guide surface 142c are obliquely arranged in directions close to each other, and when the airflow passes through the connection section 144, the airflow can flow along the first guide surface 142b and the second guide surface 142c along the trend of the first guide surface 142b and the second guide surface 142c, separate from the guide point 142a, and finally blow out from the air outlet 114.

That is, the first guide surface 142b and the second guide surface 142c are not parallel, and are disposed in a direction approaching each other, and the first guide surface 142b and the second guide surface 142c may be planar or curved.

In this embodiment, the guiding element 140 is sleeved on the fixing element 130. Namely, the connecting section 144 is sleeved on the fixing piece 130, the connecting section 144 is fixedly connected with the fixing piece 130, the diversion section 142 is arranged along the airflow direction,

In this embodiment, the fixing member 130 is one of a drop type and a streamline type.

To sum up, in this embodiment, the guiding element 140 is movably connected with the fixing element 130, under the condition that the gas flows in the accommodating cavity 112, the guiding element 140 can adjust its angle and position under the action of the air flow, so that the guiding element 140 can always flow along the air flow direction, and can always play a role in guiding flow, so as to avoid vortex street generated when the gas passes through the fixing element 130, and can play a role in guiding the gas passing through the fixing element 130, thereby ensuring uniformity and stability of the gas blown out from the air outlet 114.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms are not necessarily directed 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. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

Claims

1. An air knife, characterized in that the air knife comprises:

The fixing piece is connected with the shell and used for adjusting the opening area of the air outlet, and the extending direction and the airflow direction of the fixing piece are arranged at an included angle;

The flow guiding piece is arranged in the accommodating cavity and is movably connected with the fixing piece, when air flows in the accommodating cavity, the flow guiding piece can be arranged along the air flow direction, so that air in the accommodating cavity can flow out of the air outlet, and the air flow direction refers to the direction in which the air is blown from the air inlet to the air outlet.

2. The air knife of claim 1, wherein the flow guide member comprises a flow guide section and a connecting section which are fixedly connected with each other, and the connecting section is movably connected with the fixing member, so that the flow guide section can be arranged along the air flow direction, and the air in the accommodating cavity can flow out of the air outlet.

3. The air knife according to claim 2, wherein the connecting section is provided with a connecting hole, the connecting hole is sleeved on the fixing piece, the connecting section and the connecting hole are both circular, and the diameter of the connecting hole is larger than that of the fixing piece.

4. The air knife of claim 3, wherein the difference between the diameter of the connecting hole and the diameter of the securing member is less than or equal to 1mm.

5. An air knife according to claim 3, wherein the fixing member comprises a mounting section and at least two fixing sections, the mounting section is arranged between two adjacent fixing sections, the diameter of the mounting section is smaller than that of the fixing sections, the connecting hole is sleeved on the mounting section, and the diameter of the connecting hole is larger than that of the mounting section and smaller than that of the fixing sections.

6. The air knife of claim 2, further comprising an elastic member, wherein one end of the elastic member is connected to the fixing member, and the other end of the elastic member is connected to the connecting section, so as to achieve the movable connection between the flow guiding member and the fixing member.

7. The air knife of claim 6, wherein the connecting section has a connecting hole, the connecting hole is sleeved on the fixing piece, and the elastic piece is arranged between the fixing piece and the hole wall of the fixing hole.

8. The air knife of any one of claims 2-7, wherein an end of the diverter segment distal from the connecting segment has a diverter point disposed proximate to the air outlet.

9. The air knife of claim 8, wherein the flow guiding section comprises a first flow guiding surface and a second flow guiding surface, one end of the first flow guiding surface is connected with the connecting section, the other end of the first flow guiding surface is connected with the second flow guiding surface, one end of the second flow guiding surface away from the first flow guiding surface is connected with one end of the connecting section away from the first flow guiding surface, and the flow guiding point is arranged at the joint of the first flow guiding surface and the second flow guiding surface.

10. The air knife of any one of claims 1-7, wherein the securing member is one of drop-shaped and streamlined.