Air knife for protecting coating on surface of pipeline

Abstract

The utility model belongs to the technical field of air knives, and particularly relates to an air knife for protecting a coating on the surface of a pipeline, which comprises an air knife tail, a fixing part arranged in the middle of the outer surface of the air knife tail, a lower knife body arranged on the outer surface of the fixing part, a limiting bolt arranged on one side of the lower knife body, and an upper knife body arranged on the outer surface of the limiting bolt of the lower knife body. A cavity is formed in the middle in the upper cutter body. After a pipe fitting horizontally passes through hot galvanizing liquid, the pipe fitting horizontally passes through the air knife device (the speed is not lower than 40m / min), nitrogen is blown to the front and back of the pipe fitting through an air port structure in an air knife, air is blown in the direction opposite to the advancing direction of the pipe fitting, the effects of isolating air and protecting the surface of a plating layer are achieved, air is blown in the advancing direction of the pipe fitting, and the effect of blowing away impurities on the surface of the pipe fitting is achieved. And through air blowing of the air knife, the plating layer is evenly attached to the pipe fitting, the thickness of the plating layer is 5-10 micrometers, the plating layer is thinner than a plating layer achieved through vertical galvanization, and the use requirement is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to air knife technical field, concretely is a kind of air knife for pipeline surface coating protection. BACKGROUND

[0002] Hot galvanized pipe fitting is a kind of zinc-coated steel pipe, with good corrosion resistance, long service life, cheap and other advantages, widely used in building, machinery, coal mine, highway, bridge and other manufacturing industries, at present, in order to obtain uniform, smooth zinc coating, air knife technology has been widely used in hot galvanized pipe fitting production line, air knife mainly relies on the high-pressure gas after compression to form like knife's airflow through the knife lip gap, spray towards pipe fitting, the excess zinc liquid on the surface of strip steel from zinc pot is scraped off, and flows back to zinc pot.

[0003] The prior art has the following problems:

[0004] The existing air knife for pipeline surface coating protection cannot isolate air and blow away impurities on the surface of pipe fitting when blowing the pipe fitting after passing through hot galvanizing liquid, so that the coating cannot be uniformly attached to the pipe fitting, and the coating is thicker than that realized by vertical galvanizing, which cannot meet the use requirement. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides an air knife for pipeline surface coating protection, which solves the problem that air cannot be isolated and impurities on the surface of pipe fitting cannot be blown away.

[0006] To achieve the above object, the utility model provides the following technical scheme: an air knife for pipeline surface coating protection, comprising an air knife tail part, a fixing piece is arranged on the middle of the outer surface of the air knife tail part, a lower blade body is arranged on the outer surface of the fixing piece, a limiting bolt is arranged on one side of the lower blade body, an upper blade body is arranged on the outer surface of the limiting bolt, a cavity is formed in the middle of the inner part of the upper blade body, and a nozzle is arranged on one side of the upper blade body.

[0007] As a preferred technical scheme of the utility model, one side of the outer surface of the air knife tail part is arranged in a vortex shape.

[0008] As a preferred technical scheme of the utility model, the size of the fixing piece is matched with the size of the air knife tail part.

[0009] As a preferred technical scheme of the utility model, grooves matched with the limiting bolts are formed in the lower blade body and the fixing piece, the number of limiting bolts is two groups, and the two groups of limiting bolts are arranged in correspondence with the middle part of the fixing piece.

[0010] As a preferred technical scheme of the utility model, the size of the nozzle is matched with the size of the upper cutter body, the nozzle is provided with a spray hole on one side, and the position of the spray hole is arranged to correspond to the position of the cavity.

[0011] As a preferred technical scheme of the utility model, the gas knife tail part, the fixing part, the lower cutter body, the limiting bolt, the upper cutter body and the nozzle are specifically made of alloy material.

[0012] Compared with the prior art, the utility model provides a gas knife for pipeline surface plating layer protection has the following beneficial effects:

[0013] The gas knife for pipeline surface plating layer protection, when the pipe passes through the hot galvanizing liquid horizontally, passes through the gas knife device horizontally (the speed is not less than 40 m / min), and the nitrogen gas is blown to the front and back of the pipe through the air port structure inside the gas knife, the gas is blown to the opposite direction of the pipe advancing, realizes the air isolation and the surface protection of the plating layer, the gas is blown to the direction of the pipe advancing, plays the role of blowing away the impurities on the surface of the pipe, improves the anticorrosion capacity of the product, and the plating layer is uniformly attached to the pipe through the gas blowing of the gas knife, and the plating layer thickness is 5-10 microns, which is thinner than the plating layer realized by the vertical galvanizing, and meets the use requirement. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a cross-sectional structure schematic view of the utility model.

[0015] In the drawing: 1, gas knife tail part;2, fixing part;3, lower cutter body;4, limiting bolt;5, upper cutter body;6, cavity;7, nozzle. DETAILED DESCRIPTION

[0016] The technical scheme in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range protected by the utility model.

[0017] Please refer to Figure 1 In the embodiment, a gas knife for pipeline surface plating layer protection includes a gas knife tail part 1, a fixing part 2 is arranged on the middle of the outer surface of the gas knife tail part 1, a lower cutter body 3 is arranged on the outer surface of the fixing part 2, a limiting bolt 4 is arranged on one side of the lower cutter body 3, an upper cutter body 5 is arranged on the outer surface of the limiting bolt 4, a cavity 6 is arranged in the middle of the inside of the upper cutter body 5, a nozzle 7 is arranged on one side of the upper cutter body 5, high-pressure nitrogen gas is connected to the gas knife tail part 1, so that the nitrogen gas is blown out from the nozzle 7 through the cavity 6 in the upper cutter body 5.

[0018] In the embodiment, the tail part 1 of the air knife is provided with a vortex on one side of the outer surface thereof;

[0019] Specifically, when the tail part 1 of the air knife is connected with high-pressure nitrogen gas, the high-pressure nitrogen gas is continuously compressed in the tail part 1 of the air knife, so as to increase the pressure of the nitrogen gas when it is sprayed out.

[0020] In the embodiment, the size of the fixing member 2 is matched with the size of the tail part 1 of the air knife.

[0021] Specifically, the fixing member 2 is connected with the tail part 1 of the air knife, so as to increase the stability and firmness of the connection between the fixing member 2 and the tail part 1 of the air knife.

[0022] In the embodiment, the lower blade body 3 and the fixing member 2 are both provided with a slot matched with the limit pin 4, and the number of the limit pins 4 is two groups, which are arranged corresponding to the middle part of the fixing member 2.

[0023] Specifically, the lower blade body 3 and the fixing member 2 are connected through the limit pin 4, so as to limit and fix the tail part 1 of the air knife.

[0024] In the embodiment, the size of the nozzle 7 is matched with the size of the upper blade body 5, the nozzle 7 is provided with a spray hole on one side, and the position of the spray hole is arranged corresponding to the position of the cavity 6, and the front surface of the cavity 6 is provided with a convex shape.

[0025] Specifically, the nitrogen gas is blown forward and backward through the air knife internal air port structure, the nitrogen gas is blown in the opposite direction of the forward movement of the pipe, so as to isolate air and protect the surface of the plating layer, the nitrogen gas is blown in the direction of the forward movement of the pipe, so as to blow away the impurities on the surface of the pipe, and the corrosion resistance of the product is improved.

[0026] In the embodiment, the tail part 1 of the air knife, the fixing member 2, the lower blade body 3, the limit pin 4, the upper blade body 5 and the nozzle 7 are made of alloy material.

[0027] Specifically, the alloy material has strong normal temperature mechanical properties and wear resistance, so as to improve the use effect and service life of the air knife.

[0028] The working principle and use process of the utility model are as follows: the lower blade body 3 and the fixing member 2 are connected through the limit pin 4, the tail part 1 of the air knife is limited and fixed, the tail part 1 of the air knife is connected with high-pressure nitrogen gas, the nitrogen gas is blown out from the nozzle 7 through the cavity 6 in the upper blade body 5, when the pipe passes through the hot galvanizing liquid horizontally, the horizontal passing speed of the pipe through the air knife device is not less than 40 m / min, the nitrogen gas is blown forward and backward through the air knife internal air port structure, the nitrogen gas is blown in the opposite direction of the forward movement of the pipe, so as to isolate air and protect the surface of the plating layer, the nitrogen gas is blown in the direction of the forward movement of the pipe, so as to blow away the impurities on the surface of the pipe, and the corrosion resistance of the product is improved, the plating layer is uniformly attached to the pipe through the blowing of the air knife, and the thickness of the plating layer is 5-10 microns, which is thinner than the plating layer realized by the vertical galvanizing.

[0029] Finally, it should be noted that the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included within the scope of the present application.

Claims

1. An air knife for the protection of the surface coating of a pipe, comprising an air knife tail (1), characterised in that: The outer surface of the tail part (1) of the air knife is provided with a fixing part (2), the outer surface of the fixing part (2) is provided with a lower knife body (3), one side of the lower knife body (3) is provided with a limiting bolt (4), the outer surface of the lower knife body (3) located at the limiting bolt (4) is provided with an upper knife body (5), the inner surface of the upper knife body (5) is provided with a cavity (6), and one side of the upper knife body (5) is provided with a nozzle (7).

2. A gas knife for protecting a coating on a pipe surface according to claim 1, characterized in that: The outer surface of the tail part (1) of the air knife is provided with a fixing part (2), the outer surface of the fixing part (2) is provided with a lower knife body (3), one side of the lower knife body (3) is provided with a limiting bolt (4), the outer surface of the lower knife body (3) located at the limiting bolt (4) is provided with an upper knife body (5), the inner surface of the upper knife body (5) is provided with a cavity (6), and one side of the upper knife body (5) is provided with a nozzle (7).

3. A gas knife for protecting a coating on a surface of a pipe according to claim 1, wherein: The size of the fixing part (2) is matched with the size of the tail part (1) of the air knife.

4. The air knife for protecting the coating on the surface of a pipe according to claim 1, wherein: The lower knife body (3) and the fixing part (2) are both provided with a slot matched with the limiting bolt (4), the number of the limiting bolts (4) is two, and the two limiting bolts (4) are correspondingly arranged at the middle part of the fixing part (2).

5. The air knife for protecting the coating on the surface of a pipe according to claim 1, wherein: The size of the nozzle (7) is matched with the size of the upper knife body (5), the nozzle (7) is provided with a spray hole at one side, the position of the spray hole is correspondingly arranged with the position of the cavity (6), and the front surface of the cavity (6) is provided with a convex character.

6. A gas knife for protecting a coating on a pipe surface according to claim 1, characterized in that: The tail part (1), the fixing part (2), the lower knife body (3), the limiting bolt (4), the upper knife body (5) and the nozzle (7) are made of alloy material.

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