JP2000039117A - Burner for pressure welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable heating of the entire circumference of a joint part of reinforcing bars uniformly without uneven heating. SOLUTION: Two branch pipes 2 and 2 branched off from a base pipe 1 are made to face each other in a circular arc to form circular arc-shaped parts 3 and 3 and a plurality of flame jetting pipes 4, 4... arranged in communication with the branch pipes 2 and 2 along the inner circumference of the circular arc-shaped parts 3 and 3 are protrusively arranged toward the arc center of the circular arc-shaped parts 3 and 3 while jetting holes 5, 5... at the tip thereof are formed in slots along the circular arc-shaped parts 3 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure welding burner used for heating and pressure welding rebars.

[0002]

2. Description of the Related Art The basic structure of a gas pressure welding apparatus for reinforcing bars is as follows.
As shown in FIGS. 6 and 7, a heating device a and a pressure device b
They are roughly divided into The heating device a injects a mixed gas supplied from an acetylene cylinder c and an oxygen cylinder d with a flame from a heating burner e, heats a joint of the reinforcing bar h, and joins the joint surfaces by a pressure welder f. Are pressed against each other to perform joining.

In this case, as shown in FIG. 8, the heating burner e has a bifurcated and arcuate tip at the tip, and a large number of injection nozzles g are linearly formed on the inner peripheral side. And the joint of the reinforcing bar h can be heated along the circumference.

[0004] That is, as shown in FIG.
Is uniformly heated by a heating burner e, and the joining surfaces of the reinforcing bars h are pressed against each other by a pressure welding device f, so that the joining portion i is crushed and swells. The bump j is formed, and the joint is made to have the strength of the joint i.

[0005]

However, as shown in FIG. 10, unevenness in heating occurs at the joint between the injection nozzles g, where the flame is directly injected to the joint of the reinforcing bar h. The bumps j formed when pressed against each other due to the temperature difference due to the uneven heating may be deformed and cracked, or the air may enter through the cut of the flame with the injection nozzles g and g and oxidize to lower the bonding strength. There is. Therefore, in order to form the bump j as shown in FIG. 9, a heating burner e is required.
Must be operated so that there is no uneven heating, and considerable skill is required.

In view of the above, an object of the present invention is to provide a burner capable of uniformly heating the circumference of a joint portion in order to solve the above-mentioned problems.

[0007]

The above object of the present invention can be achieved by a burner having the following structure. That is, the gist of the invention is that a plurality of flames are formed by making two branch pipes branching from a base pipe in an arc shape to form an arc part, and communicating with the branch pipe along the inner periphery of the arc part. A press-connecting burner characterized in that an injection pipe is provided so as to project toward an arc center of the arc-shaped portion, and a flame injection hole at a tip thereof is formed in a long hole shape along the arc-shaped portion. . Further, a required number of a pair of auxiliary flame injection pipes communicating with the branch pipe are formed in the left-right direction of the arc-shaped portion, and the auxiliary flame injection hole at the tip thereof is formed into a long hole substantially perpendicular to the arc-shaped portion. The shape is such that the joint portion of the reinforcing steel and the portion in front thereof can be heated simultaneously.

[0008]

In the burner of the present invention, as shown in FIG. 5, the injection holes 5 of the flame injection tubes 4, 4,... Each of the injection holes 5, 5,
.. It is possible to uniformly heat the entire circumference without generating a break in the flames C, C,.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings showing the embodiments. Example 1 As shown in FIG. 1, two branch pipes 2 and 2 branched from a base pipe 1 are formed with arcuate portions 3 and 3 in which the distal ends are arcuately opposed.

A plurality of flame injection tubes 4, 4,... Are formed along the inner periphery of the arc-shaped portions 3, 3.
Are formed so as to protrude toward the arc core. Therefore, the flame injection tubes 4, 4,..., The injection holes 5 at the distal end are formed into elongated holes along the arc-shaped portions 3, 3.

Therefore, as shown in FIG. 2, the flame C injected to the circumference of the joint B of the reinforcing bar A is sprayed evenly to the circumference of the joint B. 5 is to adjust the length.

Embodiment 2 As shown in FIG. 3, arc-shaped portions 3, 3 are formed in which two branch pipes 2, 2 branched from a base pipe 1 have arc-shaped opposing ends. .

A plurality of flame injection tubes 4, 4,... Are formed along the inner periphery of the arcuate portions 3, 3.
Are formed so as to protrude toward the arc core. Therefore, the flame injection tubes 4, 4,..., The injection holes 5 at the distal end are formed into elongated holes along the arc-shaped portions 3, 3.

Next, a plurality of pairs of auxiliary flame injection pipes 6, 6 branched to the left and right with respect to the arc-shaped portions 3, 3 are formed. 3 and a long hole shape perpendicular to the shape of the hole 3.

Therefore, as shown in FIG. 4, the flame C injected from the injection holes 5 of the flame injection tubes 4, 4,... The flame C which is uniformly injected and which is injected from the auxiliary flame injection holes 7 of the auxiliary flame injection pipes 6 and 6 is injected to a portion in front of the joint B to simultaneously heat the joint B and the portion in front thereof. And heating with the burner fixed can be performed.

[0016]

As described above, according to the present invention, by making the injection hole into a long hole shape, it becomes possible to heat uniformly over the entire circumference of the joint of the reinforcing bar, and the entire circumference can be heated. By covering with a flame, uniform joining can be performed without a break in the flame and without causing oxidation due to the entry of air. Therefore, a uniform bump is formed at the joint, and a strong reinforcing bar can be joined.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view of a pressure welding burner according to a first embodiment of the present invention.

FIG. 2 is an operation explanatory diagram according to the first embodiment of the present invention.

FIG. 3 is an overall explanatory view of a pressure welding burner according to a second embodiment of the present invention.

FIG. 4 is an operation explanatory diagram according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a heating state by a press-contact burner according to the present invention.

FIG. 6 is an explanatory diagram of a conventional heating device.

FIG. 7 is an explanatory view of a conventional pressurizing device.

FIG. 8 is an explanatory view of a conventional heating burner.

FIG. 9 is an explanatory view showing a bonding state using a conventional heating burner.

FIG. 10 is an explanatory diagram showing a heating state by a conventional heating burner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base pipe 2 Branch pipe 3 Arc-shaped part 4 Flame injection pipe 5 Injection hole 6 Auxiliary flame injection pipe 7 Auxiliary flame injection hole

Claims (2)

[Claims] 1. A plurality of branch pipes branched from a base pipe are formed in an arc shape so as to face each other to form an arc shape portion, and communicate with the branch pipe along an inner circumference of the arc shape portion. A press-burning burner, characterized in that a flame injection tube is protruded toward the arc of the arc-shaped portion, and a flame injection hole at the tip is formed in a long hole shape along the arc-shaped portion. 2. A required number of a pair of auxiliary flame injection pipes, which are in communication with the branch pipe, are formed in the left-right direction of the arc-shaped part, and the auxiliary flame injection hole at the tip thereof is substantially perpendicular to the arc-shaped part. 2. A pressure welding burner according to claim 1, wherein said burner has an elongated hole shape.