JPH0721568Y2 - Nozzle for inner surface blower for plated steel pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a nozzle of an inner surface blowing device for a plated steel pipe.

"Prior Art" The inner surface blower for plated steel pipes removes excess molten metal left on the inner surface of the steel pipe immediately after plating by ejecting steam into the plated steel pipe during the transfer of the plated steel pipe to the next process. The nozzle of the device 31 is conventionally provided as follows.
As shown in FIG. 2, an inward flange 33 is provided on the inner surface of the front portion of the nozzle 32, and a tapered guide wall surface 34 having a small rear diameter is formed on the inner surface portion of the nozzle in front of the flange so that the inner surface is blown. From the flange hole 35 of the inward flange that fits the rear end surface into the front part of the nozzle along the guide wall surface and substantially forms the front end of the nozzle hole,
The steam is blown into the plated steel pipe 20. 21,2
Reference numeral 1 is a roller for transferring the plated steel pipe 20 backward.

[Problems to be solved by the invention] In the above conventional nozzle, the rear end surface of the plated steel pipe is abutted against the front surface of the inner peripheral portion of the flange 33, and steam is jetted into the plated steel pipe to cause excess melting remaining on the inner surface of the plated steel pipe. The metal is blown away, but due to the bending and bending of the plated steel pipe, a gap is created between the end face of the plated steel pipe and the front end face of the nozzle, causing vapor leakage, and the vapor pressure drop due to the vapor leakage makes it difficult to remove the molten metal. In some cases, the outer surface of the plated steel pipe, which was completely touched by the leaked steam, was discolored.

The idea is to change the angle of the front end face of the nozzle opening and bring them into intimate contact with each other according to the angle of the end face of the plated steel pipe to reduce the leaked steam, and also when the steam leaks, the steam will be exposed to the outer surface of the plated steel pipe. It is provided so as not to touch.

"Means for Solving the Problem" The first outer cylinder 3 in which the inner peripheral wall surface of the front end portion is formed in the concave spherical portion 4.
And rotatably fitted to the inner surface of the front end portion of the first outer cylinder,
An inner cylinder 10 which forms an outer peripheral wall surface by a convex spherical surface portion 11 which is in airtight contact with the concave spherical surface portion, and by pressing a part of the outer peripheral surface of the inner cylinder front end surface rearward, the first outer cylinder The front end face of the inner cylinder 10 was formed so as to be inclined in any direction with respect to the front end face of No. 3.

The second outer cylinder 6 is extended from the outer peripheral surface of the first outer cylinder 3 in the front direction, and a taper guide cylinder 8 having a small rear diameter is protruded from the front end of the second outer cylinder to the rear inward direction to extend the rear of the guide cylinder. Inner diameter of inner end
10 is larger than the front end diameter and the outer diameter of the steel pipe 20 to be blown on the inner surface, and the guide cylinder rear end surface is located forward of the inner cylinder front end surface 12, and the second outer cylinder 6 is provided with the second outer cylinder. A steam discharge pipe 9 communicating between the inside and outside of the above was attached.

[Operation] In FIG. 1, when the front end surface of the inner cylinder 10 of the inner surface blower 1 is abutted against the rear end surface of the plated steel pipe 20, if there is a gap due to the mismatch of both end surfaces, the inner cylinder 10 is rotated. The gap is eliminated by changing the direction of the front end face. Further, even if some gaps remain and steam leaks from between the both end faces, the leaked steam enters the second outer cylinder 6 of the nozzle 2 and enters the steam discharge pipe 9
Emitted from.

"Embodiment" 1 is an inner surface blower for a plated steel pipe, the nozzle 2 of which has a first outer cylinder 3, and an inner cylinder 10 is rotatably fitted in the first outer cylinder 3. . The inner wall surface of the front end of the first outer cylinder is a concave spherical surface portion 4, and the outer wall surface of the inner cylinder is a convex spherical surface portion 11 so that both spherical surface portions are brought into airtight contact.
Further, the front end portion of the inner cylinder 10 is projected forward of the front end surface 5 of the first outer cylinder 3, and by pressing a part of the outer periphery of the inner cylinder front end surface 12 rearward, the front end of the first outer cylinder 3 The inner cylinder front end face 12 is rotatably fitted to the face 5 so as to be inclined in an arbitrary direction. The inner surface of the cylindrical hole 13 of the inner cylinder 10 may be formed in a tapered shape with a small front diameter, and the front end portion of the inner cylinder is made thick so that the front end surface 12 is formed wide so that the rear end surface of the plated steel pipe 20 can be abutted against each other in an airtight manner. Set up.

The second outer cylinder 6 extends forward from the outer peripheral surface of the first outer cylinder 3 and projects rearward inward from the front end of the second outer cylinder via the inward flange 7 to form a taper guide cylinder 8 having a small rear diameter. Project.
The rear end of the guide cylinder is located in front of the front end surface of the inner cylinder 10, and a gap is provided between them, and the inner diameter of the rear end of the guide cylinder is larger than the outer diameter of the plated steel pipe 20 to be blown on the inner surface and the front end diameter of the inner cylinder. And smaller than the outer diameter of the inner cylinder front end. Further, the second outer cylinder 6 is provided with a steam discharge pipe 9 that communicates the inside and the outside of the second outer cylinder.

[Advantages of the Invention] The present invention is configured as described above, and the inner peripheral surface of the front end of the first outer cylinder forming the nozzle and the outer peripheral surface of the inner cylinder fitted in the front end of the first outer cylinder are hermetically sealed. The inner cylinder front end surface is inclined in an arbitrary direction with respect to the first outer cylinder front end surface by forming a concave and convex spherical surface portion that comes into surface contact with the inner cylinder and pressing a part of the outer periphery of the front end surface of the inner cylinder rearward. Therefore, when the rear end surface of the plated steel pipe is butted against the inner front end surface, even if the plated steel pipe bends or is bent so that the both end faces do not match, the both end faces are strongly butted against each other. By moving them, both end faces can be brought into surface contact with each other, and thus vapor leakage from between the both end faces can be prevented.

Further, by forming as in claim 2, even if some steam leaks from the both end surfaces, it enters the second outer cylinder through the gap between the front end surface of the inner cylinder and the rear end surface of the guide cylinder. Since the steam is discharged to the outside from the steam discharge pipe, the leaked steam does not affect the outer surface of the plated steel pipe and discolor the outer plated portion.

[Brief description of drawings]

FIG. 1 is a sectional view of the nozzle of the present invention showing the rear end face of a plated steel pipe butted against the front face of the nozzle, and FIG. 2 is a sectional view showing a conventional nozzle in the same manner. DESCRIPTION OF SYMBOLS 1 ... Inner surface blow device, 2 ... Nozzle 3 ... 1st outer cylinder, 4 ... Concave spherical surface part 6 ... 2nd outer cylinder, 10 ... Inner cylinder 11 ... Convex spherical surface part

Claims (2)

[Scope of utility model registration request] 1. A first outer cylinder (3) having a concave spherical surface (4) formed on the inner peripheral wall surface of the front end, and a first outer cylinder (3) rotatably fitted to the inner surface of the front end of the first outer cylinder. It is composed of an inner cylinder (10) forming an outer peripheral wall surface with a convex spherical portion (11) that comes into surface contact with the spherical portion in an airtight manner. By pressing a part of the outer periphery of the inner cylinder front end surface rearward, A nozzle for an inner surface blowing device for a plated steel pipe, characterized in that the front end face of the inner cylinder (10) is formed so as to be inclined in any direction relative to the front end face of the outer cylinder (3). 2. The first outer cylinder (3) is moved forward from the outer peripheral surface toward the second side.
While extending the outer cylinder (6), a rear small-diameter tapered guide cylinder (8) is projected from the front end of the second outer cylinder to the rear inward direction,
The inner diameter of the rear end of the guide cylinder is larger than the front end diameter of the inner cylinder (10) and the outer diameter of the steel pipe (20) whose inner surface is blown, and the rear end surface of the guide cylinder is located ahead of the inner cylinder front end surface (12). A nozzle for an inner surface blowing device for a plated steel pipe according to claim 1, characterized in that a steam discharge pipe (9) communicating with the inside and outside of the second outer cylinder is attached to the second outer cylinder (6). .