KR102326831B1 - Galvanizing Air Knife Blowing Uniform Dynamic Pressure - Google Patents

Abstract

The present invention relates to a galvanizing air knife blowing a uniform dynamic pressure, which is able to blow a uniform air pressure through a nozzle, and control a plating thickness to be uniform. According to the present invention, the galvanizing air knife blowing a uniform dynamic pressure, which blows the air to a surface of a steel sheet continuously passing through a plating tub and allows the zinc to be plated in a thin uniform layer, comprises: a rectangular base chamber having air pressure inlets on both side units; a chamber frame installed on a lower opening unit of the base chamber and providing a passage through which the air pressure passes; an upper lip fixer fixed on an upper side of the chamber frame; a lower lip fixed on a lower side of the chamber frame; an upper lip installed on the upper lip fixer; an upper lip control means controlling the position of the upper lip and controlling the distance between the lower lip and the upper lip; and a uniform pressure means for making the overall air pressure introduced into the chamber frame uniform. The uniform pressure means includes a mesh net body installed in the chamber frame.

Description

Galvanizing Air Knife Blowing Uniform Dynamic Pressure

The present invention relates to an air knife of a galvanized steel sheet manufacturing facility, and more particularly, a galvanizing spraying uniform dynamic pressure that enables uniform adjustment of the plating thickness by allowing uniform air pressure to be ejected through a nozzle to the air knife. It's about air knives.

Steel sheets widely used in industrial fields are galvanized at the time of production of steel sheets in steel mills to prevent rust. Zinc plating is usually performed by continuously passing a steel sheet as a material to be plated through a hot-dip galvanizing bath containing zinc in a molten state. The galvanized steel sheet is shipped in a coiled state.

Meanwhile, in order to maintain a constant thickness of zinc plated on the steel sheet at the time of galvanizing and further improve product quality, air is uniformly sprayed on the front and back surfaces of the steel sheet using an air knife to wipe the molten zinc.

Since the plating thickness can be determined by the spray pressure of air, it is very important to ensure that a constant pressure is sprayed throughout the nozzle width direction of the air knife. And for uniform injection pressure, the structure of the inner space of the air knife plays an important role.

As a prior art, Korean Patent Registration No. 10-0775225 proposes an air knife for a hot-dip plating line with excellent uniform discharge properties.

In this prior art, a chamber that receives and discharges supplied air or gas and constitutes a multi-stage pressure equalization space therein, is installed in connection with the front of the chamber and forms another equalizing space, while air or gas passes and maintains the strength of the air knife It includes a lip support composed of a sieve, and upper and lower ribs connected to each other to provide an air outlet forming a gap in cooperation with each other in the front of the lip support, wherein the chamber is installed horizontally and sealed inside the first air passage hole It is proposed to include a first rectifying wall configured to form the first and second pressure equalization spaces in the chamber, and the air or gas supply pipe is connected to the first pressure equalization space side by the first rectifying wall.

However, according to this technology, the first rectifying wall acts as a throttling function of the inner space of the air knife, and in practice, it is difficult to effectively promote a uniform pressure. And this first rectifying wall merely serves as a bridgehead for installing the air discharge amount profile adjusting means.

In addition, as another prior art, according to Korean Patent Registration No. 10-0526133, a means for adjusting the upper lip and the lower lip is disclosed. According to this method, the working time for adjusting the gap between the upper lip and the lower lip is too long There was a problem with taking. This is because all bolts fixed along the width direction must be loosened, adjusted, and then tightened again one by one.

Korean Patent Registration No. 10-0775225 Korean Patent Registration No. 10-0526133

An object of the present invention with respect to the prior art is to provide a galvanizing air knife that allows air pressure to be uniformly discharged in the width direction of a nozzle or a steel plate by allowing a constant dynamic pressure to act on the inner space of the air knife do it with

Another object of the present invention is to provide a galvanizing air knife capable of conveniently adjusting the gap between the upper lip and the lower lip.

The above object is provided in an air knife that sprays air on the surface of the steel sheet continuously passing through the plating bath to perform galvanizing with a thin and constant thickness,

A rectangular base chamber having air pressure inlets on both sides;

a chamber frame installed in the lower opening of the base chamber and providing a passage through which air pressure passes; an upper lip holder fixedly installed on the upper side of the chamber frame; a lower lip fixed to the lower portion of the chamber frame; an upper lip installed on the upper lip holder;

an upper lip adjusting means for adjusting the distance between the lower lip and the upper lip by adjusting the position of the upper lip;

and a pressure equalization means for uniformly uniforming the air pressure introduced into the inner space of the chamber frame as a whole;

The pressure equalization means is achieved by a galvanizing air knife that sprays a uniform dynamic pressure, characterized in that the mesh mesh body installed in the inner space of the chamber frame.

According to another feature of the present invention, the upper lip adjustment means,

As a plurality of pieces are installed along the width direction of the steel plate,

a cam shaft having a cam installed and pivotally coupled to the chamber frame to which the upper lip holder is fixed; a cam seating hole provided on the upper lip holder to which the camshaft is fitted so that the cam is inscribed; It may include a camshaft rotation mechanism installed in the chamber frame to rotate the camshaft.

According to the present invention, the air pressure flowing into the inner space of the air knife and forming turbulence flows out into the gap between the upper lip and the lower lip in a state in which the air pressure becomes uniform in a laminar flow state by the mesh mesh body, so as to follow the width direction of the steel plate. A galvanizing air knife for spraying a uniform dynamic pressure so that the air pressure can be uniformly ejected is provided.

According to another embodiment of the present invention, there is provided a galvanizing air knife that sprays a uniform dynamic pressure that allows the gap between the upper lip and the lower lip to be conveniently adjusted by adjusting the upper lip up and down using a cam.

1 is a perspective view of a galvanizing air knife for spraying uniform dynamic pressure according to an embodiment of the present invention.
Figure 2 is a schematic exploded perspective view of a galvanizing air knife spraying a uniform dynamic pressure according to an embodiment of the present invention.
3 is a schematic cross-sectional view of a galvanizing air knife for spraying uniform dynamic pressure according to an embodiment of the present invention.
Figure 4 is a configuration diagram of the upper lip adjustment means of the galvanizing air knife for spraying uniform dynamic pressure according to an embodiment of the present invention.
Figure 5 is a schematic front view of the upper lip adjusting means of the galvanizing air knife for spraying uniform dynamic pressure according to an embodiment of the present invention.
6 is a photograph of a mesh mesh body used in a galvanizing air knife for spraying uniform dynamic pressure according to an embodiment of the present invention.

Hereinafter, the specific content of the present invention will be described in detail with reference to the accompanying drawings at the same time. However, specific drawings will be cited where necessary.

The galvanizing air knife (1. hereinafter, simply referred to as 'air knife') that sprays uniform dynamic pressure of the present invention sprays air on the surface of the steel plate that continuously passes through the plating bath so that plating is made to a thin and constant thickness. is a device that

The base chamber 3 is in the form of a rectangular box. At both sides of the base chamber 3, an air pressure inlet 5 through which externally generated air pressure is introduced is provided. The lower front of the base chamber 3 is opened, and the chamber frame 9 is installed in the opened portion 7 . An upper lip holder 11 is installed on the upper side of the chamber frame 9 .

"와 같은 형태로 구성되어 있다. 챔버프레임(9)과 상부립고정대(11)의 양측에는 사이드커버(12)가 고정되어 챔버프레임(9)의 내부공간이 밀폐되어 있도록 한다. The chamber frame 9 provides an inner space, which becomes a passage S through which air pressure is passed. The upper lip holder 11 is assembled and installed on the upper lip holder holder 27 on the upper side of the chamber frame 9 . The upper lip holder 11 includes a vertical fixing part 11a fixed to the upper front surface of the chamber frame 9 and an inclined extension part 11b extending obliquely from the lower end of the vertical fixing part 11a toward the front when viewed from the side. includes As a result, the upper lip holder 11 is on the side, as shown in FIG. 3, "

The side cover 12 is fixed to both sides of the chamber frame 9 and the upper lip holder 11 so that the inner space of the chamber frame 9 is sealed.

The lower lip 13 is fixedly installed on the lower pedestal 29 of the chamber frame 9 , and the upper lip 15 is fixedly installed on the upper lip holder 11 . The lower lip 13 is fixedly installed in front of the chamber frame 9 so that the position can be precisely adjusted by the first shim member 17 installed in the same manner as the washer. The upper lip 15 is also fixedly installed on the upper lip holder 11 so that the position can be precisely adjusted by the second core member 19 .

The air pressure flows into the rectangular passage S provided by the chamber frame 9 and is ejected through the gap T between the lower lip 13 and the upper lip 15 . The space G between the upper lip holder 11 and the lower pedestal 29 of the chamber frame 9 is narrowed in width toward the outlet (see FIG. 3 ).

According to the present invention, the average angle (J) between the upper surface 21 of the lower pedestal of the chamber frame 9 and the lower surface 23 of the upper lip holder 11 is made to be 23°. And the upper surface 21 of the lower pedestal of the chamber frame has a curved surface having a predetermined curvature (R) in whole or in part. And the space between the lower lip 13 and the upper lip 15 is composed of a portion L1 having a narrow interval and a portion L2 having a constant interval, and the angle K between the narrowing portion L1 is 13 °, the gap distance (M) of a certain part is set to be 1.0 ~ 1.6mm on average.

According to the present invention, it includes a pressure equalization means for uniformizing the air pressure introduced into the space between the lower support 29 and the upper lip holder 11 of the chamber frame as a whole.

The pressure equalization means includes a mesh mesh (25). The mesh body 25 is installed on the passage (S) of the chamber frame (9). The mesh network 25 is a form as illustrated in FIG. 6, and a thin stainless steel net of a shape similar to a mosquito net is overlapped in several layers to have a certain thickness (eg, 10 to 100 mm) with respect to the direction of air pressure. it is composed The mesh body 25 is a means for providing a porous member. The air pressure in a turbulent flow state created by colliding while being introduced from both sides of the air knife is rectified while passing through the mesh body 25 and becomes a laminar flow.

According to the present invention, an upper lip adjusting means for adjusting the distance between the lower lip 13 and the upper lip 15 by adjusting the position of the upper lip 15 is further included.

Hereinafter, the upper lip adjusting means will be described.

The upper lip holder 11 is movably coupled up and down on the upper lip holder seat 27 of the chamber frame.

The upper lip adjusting means includes a cam mechanism 31 installed in plurality along the width direction of the steel plate. And this cam mechanism 31 is preferably configured so that adjustment is possible simultaneously and uniformly.

The cam mechanism 31 is composed of a cam shaft 35 in which the cam 33 is installed, and a cam seating hole 37 in which the cam 33 is inscribed. The camshaft 35 is pivotally coupled to the upper lip fixing base rest 27 . The cam seating hole 37 is provided horizontally on the upper lip holder 11 , in particular the vertical fixing part 11a thereof. The camshaft 35 penetrates the upper lip holder 11 and is pivotally coupled to the upper lip holder mount 27 . The upper lip holder 11 and the upper lip holder seat 27 are fastened with bolts and plate springs, and the tightening force is adjusted with a torque wrench.

By this configuration, the upper lip holder 11 is vertically adjusted in the direction of the arrow so that the distance M between the lower lip 13 and the upper lip 15 can be adjusted.

The vertical flow range of the upper lip 15 corresponding to the stroke of the cam 33 (H, see FIG. 5 ), that is, the adjustable range is only 2-3 mm. And the rotation angle G of the camshaft 35 may be 20 to 40°. A first bearing 39 may be interposed between the cam 33 and the cam seating hole 37 to reduce frictional force.

The camshaft 35 may perform a cam function while rotating by a camshaft rotation mechanism installed in the chamber frame 9 . The camshaft rotating mechanism has a lever 41 having a lower end connected to the camshaft and an upper end extending upward, and a connecting rod 43 connected to the upper end of the lever installed in each cam mechanism and extending in the width direction of the upper lip. And, as being installed on one side of the connecting rod 43, the connecting rod 43 may include a connecting rod adjustment bolt 45 that enables to push or pull.

It is possible to push or pull the connecting rod 43 while tightening or loosening the connecting rod adjusting bolt 45 , whereby each camshaft 35 dependent on the connecting rod 43 can be rotated at the same time. At the connection point between the lever 41 and the connecting rod 43, a second bearing 47 for allowing their relative rotation is interposed as a hinge means. The connecting rod adjustment bolt 45 may prevent it from being arbitrarily rotated by the locking device.

According to another embodiment of the present invention, in addition to the mesh mesh 25 as a pressure equalization means, an auxiliary mesh mesh 49 in the form of a mosquito net may be installed at the rear end of the mesh mesh 25 at intervals. The auxiliary mesh network 49 is a mesh body made of a 0.2mm metal wire. The auxiliary mesh network 49 is standardized to a standard corresponding to the cross-sectional area of the passage S by the mesh mesh frame 51 . The auxiliary mesh network 49 further stabilizes the uniformed air pressure.

The configuration shown and described above is merely a preferred embodiment based on the technical idea of the present invention. Those skilled in the art will be able to make various changes based on common technical knowledge, but it should be noted that these may be included in the protection scope of the present invention. Various combinations of the embodiments disclosed above are possible, and all possible combinations are within the scope of the present invention.

1: Air knife 3: Base chamber
5: air inlet 7: opening part
9: Chamber frame 11: upper lip holder
12: side cover 13: lower lip
15: upper lip 17,19: first and second core members
25: mesh mesh 27: upper lip fixing base seat
29: lower support 31: cam mechanism
33: cam 35: camshaft
37: cam inner work 39: first bearing
41: lever 43: connecting rod
45: connecting rod adjustment bolt 47: second bearing
49: auxiliary mesh network 51: mesh network frame
G : The space between the upper lip holder and the lower support
S: passage

Claims (6)

delete It is provided in an air knife that sprays air on the surface of a steel sheet continuously passing through the plating bath so that zinc plating is made to a thin and constant thickness,
A rectangular base chamber having air pressure inlets on both sides;
a chamber frame installed in the lower opening of the base chamber and providing a passage through which air pressure passes;
an upper lip holder fixedly installed on the upper side of the chamber frame;
a lower lip fixed to the lower portion of the chamber frame;
an upper lip installed on the upper lip holder;
an upper lip adjusting means for adjusting the distance between the lower lip and the upper lip by adjusting the position of the upper lip;
and a pressure equalization means for making the air pressure introduced into the chamber frame uniform as a whole;
The upper lip adjustment means;
As a plurality of pieces are installed along the width direction of the steel plate,
a cam shaft having a cam installed and pivotally coupled to the chamber frame to which the upper lip holder is fixed;
a cam seating hole provided on the upper lip holder to which the camshaft is fitted so that the cam is inscribed; and
a camshaft rotation mechanism installed in the chamber frame to rotate the camshaft;
The camshaft rotation mechanism,
The lower end is connected to the camshaft and the upper end is extended upward, the lever 41 is connected to the upper end of the lever installed in each cam mechanism and extends in the width direction of the upper lip; Galvanizing air knife for spraying uniform dynamic pressure, characterized in that it is installed on one side of the connecting rod (43) and includes a connecting rod adjustment bolt (45) that allows the connecting rod (43) to be pushed or pulled.
delete 3. The method of claim 2,
The pressure equalization means,
a mesh mesh body installed in the inner space of the chamber frame;
Galvanizing air knife for spraying uniform dynamic pressure, characterized in that it comprises a.
5. The method of claim 4,
The mesh mesh body is a galvanizing air knife for spraying uniform dynamic pressure, characterized in that the stainless steel mesh in the form of a mosquito net is overlapped in multiple layers to have a thickness of 10 to 100 mm with respect to the direction of air pressure.
5. The method of claim 4,
Galvanizing air knife for spraying uniform dynamic pressure, characterized in that an auxiliary mesh (49) in the form of a mosquito net in addition to the mesh is further installed at the rear end of the mesh (25) at intervals.

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