JPH08159409A - Gas pressure contact ring burner - Google Patents

Abstract

PURPOSE: To provide a gas pressure contact ring burner wherein no skilled technique is required for gas pressure contact work, and anybody can simply and securely join and the need of reciprocating motion of a ring burner is eliminated to hereby simplify the gas pressure contact apparatus itself. CONSTITUTION: Nozzles 2 of a conventional gas pressure contact ring burner are arranged in many lines axially of a steel material, and a heat insulation member or a cooling medium tube 6 is provided around each nozzle 2. Further, many cylinders 3 may be fixed to a ring structure 1 axially of the steel material, i.e., with respect to burning width (heating range) and be communicated perpendicularly to the ring structure, and many nozzles 2 may be provided on the cylinder 3, and further the nozzles 2 may be arranged in a zigzag manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas pressure welding ring burner for heating a butt portion of two steel rods or steel rods for joining steel products at a construction site.

[0002]

2. Description of the Related Art Generally, in gas pressure welding, two steel materials are pressurized while being heated, the abutting end faces of the steel materials are closely contacted with each other without a gap, and the joint portion of the two steel materials is uniformly heated and pressurized, A swelling portion having a dango shape is formed at the joint portion of the steel materials, and the two steel materials are joined together. As a conventional gas pressure welding ring burner used at this time, as shown in FIG. 5, an appropriate required number of nozzles are provided on the inner peripheral side surface of an annular body (1) having an opening (11) through which a steel material can move in and out. A structure having (2) provided at equal intervals toward the steel material is often used. In addition, as a result of various researches and developments, the inventor of the present invention discloses a ring burner which utilizes an annular burner crater and can be externally fitted and set on a steel material.
No. 6 and JP-A-57-77810 are proposed. This is a rotating open type pressure welding ring burner, which is a ring-shaped crater pipe with an appropriate number of heating craters (nozzles) arranged on its inner circumference divided into two parts. The burner crater was provided with a required number of nozzles at equal intervals on the inner circumferential side surface of the burner crater.

FIG. 6 is a diagram showing a case where gas pressure welding is performed using a conventional gas pressure welding ring burner, and description will be made based on this. First, gas pressure welding is performed with two steel materials (7), (7 ')
A bulge is formed by uniformly heating and pressurizing the joint part of No. 1, and the flame (21) from the nozzle (2) is uniformly applied to the outer peripheral surfaces of the steel materials (7) and (7 ') and the joint part. Therefore, it is necessary to obtain sufficient bonding strength. Therefore, the entire nozzle (2) is moved to the left and right within the burned width (heating range) of the steel materials (7) and (7 '), and is uniformly heated by the flame (21) from the nozzle (2). I had to move back and forth periodically.

In recent years, a device for automating the gas pressure welding work has been used. For this, a ring burner for heating the butt ends of two steel materials, a reciprocating means for reciprocally swinging the ring burner, a pressurizing means for pressurizing the two steel materials, and two joining members are joined. At least a holding member for holding each steel material and a drive source are required, and the present inventor has made various proposals regarding this. However, when the two steel materials are heated and softened, the pressurizing means forms a dumpling-shaped bulge at the joint portion between the two steel materials to join the two steel materials, but the joint portion moves. As a result, the ring burner could not follow the movement of the joint portion, and it was impossible to always roast the joint portion of the steel material with the ring burner.

For this reason, the present invention proposed by Kogyo Sho 57
No. 24460 "Burner position correction device in automatic gas pressure welding machine". This is provided with a burner position correcting device of the ring burner and a stopper mechanism for adjusting the reciprocating swing width of the burner. The ring burner moves as the joining portion of two steel materials moves. Also follows automatically so that the joint portion of steel materials can always be roasted with a ring burner.

[0006]

However, when the reciprocating movement of the ring burner is performed manually, the pressure welding operator manually attaches the ring burner to the joint portion of the steel materials (7) and (7 '). It is necessary to reciprocate along the same to heat the joint part uniformly, and in order to uniformly heat the joint part, the movement of the nozzle (2) needs to be fast in the middle and slow at both ends, and also when working outdoors. The wind speed is greatly affected and changes depending on the temperature and the shape and outer diameter of the steel materials (7), (7 '). Therefore, the heating time must be adjusted, and it depends on the skill and intuition of the pressure welding operator. Since there are many and are easily affected by the external environment, it is difficult to stabilize the bonding strength of gas pressure welding, and there is a problem that the pressure welding strength is greatly influenced by the degree of acquisition of skill. In addition, as the outer diameters of the steel materials (7) and (7 ′) become thicker, a higher pressure welding technique is required, and it is extremely difficult for an amateur to improve the joining strength.

The above-mentioned automatic gas pressure welding machine can be easily performed by an unskilled person without skilled pressure welding technology and can significantly improve the reliability of the gas pressure welding joint, but it is expensive and large-scale. Moreover, in order to perform pressure welding work under appropriate conditions, the wind speed during outdoor work is greatly affected, and the temperature rise time also varies depending on the temperature changes in winter and summer. Furthermore, work conditions, gas equipment, flame performance, Depending on the shape of the reinforcing bar, etc., it is necessary to readjust the set time, and many problems remain in order to obtain a stable joint.

When performing the pressure welding work, if the nozzles of the ring burner are provided in a large number of rows, the nozzles are heated and there is a risk of flashback (in the present invention, it means that the flame enters the inside of the ring from the crater). Therefore, it is considered that the heating method in which the nozzles are arranged in a large number of rows and the ring burner is fixed without reciprocating is impossible in the past, and a ring burner having a large number of nozzles arranged in a row is put into practical use. There has never been an idea to do so.

The present invention does not require any skill in the pressure welding work, and anyone can do it easily and firmly, and the reciprocating movement of the ring burner becomes unnecessary, so that the gas pressure welding device itself can be simplified. -The purpose is to provide

[0010]

The present invention has been made to solve the above problems, that is, the nozzles of the conventional gas pressure welding ring burner are arranged in multiple rows in the axial direction of the steel material. And a tube for heat insulating material or a cooling medium is provided around each nozzle. Further, in the axial direction of the steel material, that is, in the burning width (heating range), a large number of cylinders are fixed to the ring body and communicated at right angles to the ring body, and a large number of nozzles are provided in the cylinder. The nozzles may be arranged in a staggered manner.

[0011]

Next, the operation of the present invention will be described. The two steel materials (7) and (7 ') to be joined in advance are supported by a holding member (not shown). First, the heating position of the ring burner is determined by inserting the opening (11) of the ring body (1) into the joining position of the steel materials (7) and (7 '). And ignite. At this time, first, by opening and closing an unillustrated on-off valve and igniting, by adjusting the flame, the steel material (7), from the multiple nozzles (2) provided at equal intervals on the inner peripheral side surface of the ring body (1), The flame (21) spreads toward the axis of (7 '), and the entire burned width of the steel materials (7) and (7') is simultaneously heated as shown in FIG. Then, this flame (21) is roasted toward the axial center of the steel materials (7) and (7 ') as shown in FIG. 4 (b). Further, when the positions of a large number of nozzles (2) arranged in the cylinder (3) are in a staggered positional relationship with the nozzles (2) arranged in adjacent cylinders (3) as shown in FIG. , Fig. 4
As shown in (a), it is roasted toward the axial center of the steel materials (7) and (7 '), and more to the surface of the steel materials (7) and (7') than in the case of FIG. 4 (b). It is possible to roast evenly and the heating efficiency is improved. At this time, the steel material (7),
Each nozzle (2) is heated by the radiant heat from the surface of (7 ′), but the heat insulating material (5) provided around the nozzle (2) prevents abnormal heating of the nozzle (2),
Prevent the occurrence of flashback. Further, as shown in FIG. 2, a tube (6) is wound around the nozzle (2) and a cooling medium such as liquid nitrogen is circulated in the tube (6) to forcibly. It is advisable to cool the nozzle (2), actively prevent abnormal heating, and try to prevent the occurrence of flashback.

After that, when the two steel materials (7) and (7 ') are heated and become soft, by a not-shown pressing means,
The two steel materials (7) and (7 ') are joined together by bulging the joint portion of the two steel materials (7) and (7') in a dumpling shape and further heating the bulge portion for a predetermined time. Of. After joining
Extinguish the fire by closing the on-off valve. And the ring body (1) is 2
If it is removed from the steel materials (7) and (7 ') of the book, the pressure welding work is completed. The working time when the ring burner of the present invention is used can be shortened by about 70 to 80% as compared with the conventional one. Further, a device for reliably swinging the ring burner back and forth is not required, and a device for restricting the swing movement of the ring burner is also unnecessary.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. (1) is a ring body that surrounds the steel materials (7) and (7 ') and has an opening (11) through which the steel materials (7) and (7') can move in and out, and the ring body (1) A copper pipe is used for. Reference numeral (2) is a nozzle provided on the inner peripheral side surface of the ring body (1) in an appropriate number and arranged in multiple rows in the axial direction of the steel materials (7) and (7 '). (3) is a cylinder made of copper having a length such that a required width (heating range) is secured and a required number of pieces are fixed to the inner peripheral side surface or the outer peripheral side surface of the ring body (1) at right angles. In (3), a suitable number of nozzles (2) are arranged in a large number of rows toward the axial center of the steel materials (7) and (7 '). As shown in FIG. 2, the positions of the nozzles (2) arranged in the cylinder (3) are the same as those of the adjacent cylinders (3) as shown in FIG. In some cases, the nozzles (2) arranged on the adjacent cylinders (3) are staggered. The ring body (1) and the nozzle (2)
Are in communication. Further, the burned width of the steel materials (7) and (7 ') is generally good, that is, 1.5 to 2 times the diameter. The size of the ring body (1) is different depending on the steel materials (7) and (7 ') such as the length of the cylinder (3) attached to the ring body and the number of nozzles (2) arranged therein. Prepare a dedicated ring burner for each. (4) is a joint attached to the outer peripheral side surface of the ring body (1). (5) is each nozzle (2)
Is a heat insulating material made of asbestos or super heat-resistant inorganic fiber provided around (see FIG. 1), and (6) is a copper tube wound around each nozzle (2) (see FIG. 2) , The tu
A cooling medium such as liquid nitrogen is circulated inside the bulge (6).

[0014]

The present invention having the above-mentioned constitution has the following effects.

In the conventional gas burner ring burner as claimed in claim 1, the nozzles (2) are arranged in multiple rows in the axial direction of the steel materials (7) and (7 '), and each of them is arranged. Nozzle (2)
Insulation material of asbestos or super heat resistant inorganic fiber around (5)
By providing the above, even if the nozzles (2) of the ring burner, which have been impossible in the past, are provided in a large number of rows, the pressure welding work can be performed without backfire. For this reason, even if there is no skill of gas pressure welding, the flame (2) can be uniformly distributed on the outer peripheral surface of the steel material (7), (7 ').
1) hit the steel material (7), with uniform heating distribution.
Since (7 ') is joined, sufficient joining strength can be obtained. Further, the working time when the ring burner of the present invention is used can be shortened by about 70 to 80% as compared with the conventional case. What's more, no matter who does it, it can be joined firmly and firmly, and
Since a conventional device for reciprocating and swinging the ring burner and a device for restricting the reciprocating swing of the ring burner are not required, and the gas pressure welding device itself can be simplified, it is possible to provide the one whose cost is low on the market. Of.

In the conventional gas pressure welding ring burner as set forth in claim 2, the nozzles (2) are arranged in multiple rows in the axial direction of the steel materials (7), (7 '), and Since a tube (6) in which a cooling medium such as liquid nitrogen circulates is wound around each nozzle (2), the periphery of the nozzle (2) is forcibly cooled, so that a flashback may occur. Almost none,
An amateur can perform pressure welding work with confidence.

Steel materials (7), (7 ') according to claim 3
A large number of cylinders (3) having a predetermined burning width (heating range) are fixed to the ring body (1) and communicate with each other at right angles to the ring body (1), and the cylinder (3) has a predetermined number as appropriate. By directing the nozzle (2) on the axial center of the steel materials (7) and (7 '), the structure is simple and the nozzle (2) can be easily replaced or repaired.

As described in claim 4, the nozzles (2) arranged adjacent to each other in the cylinder (3) are arranged in a staggered manner so that the joints of the steel materials (7) and (7 ') are The heating can be performed more uniformly, and the heating efficiency is improved. For this reason, even if the outer diameter of the steel material (7), (7 ') is large,
The need for advanced gas pressure welding technology as in the past has become unnecessary, and it has become possible for even an amateur to improve the joining strength.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the present invention.

FIG. 3 is an explanatory view showing the operation of the present invention.

FIG. 4 is an explanatory view showing a roasted state of the flame of the present invention.

FIG. 5 is a perspective view showing a conventional product.

FIG. 6 is an explanatory view showing a roasted state of a conventional flame.

[Explanation of symbols]

 1 Annular Body 11 Opening 2 Nozzle 3 Cylinder 5 Heat Insulating Material 6 Tube 7,7 'Steel Material

Claims (4)

[Claims] 1. A large number of nozzles (2) are provided on the inner peripheral side surface of an annular body (1) having an opening (11) through which steel materials (7) and (7 ') can move in and out. In the ring burner for gas pressure welding provided at equal intervals toward the center of (7 '), the nozzles (2) are arranged in multiple rows also in the axial direction of the steel materials (7) and (7'). A ring burner for gas pressure welding, characterized by being provided with a heat insulating material (5) made of asbestos or super heat resistant inorganic fiber around each nozzle (2). 2. A large number of nozzles (2) are provided on the inner peripheral side surface of an annular body (1) having an opening (11) through which steel materials (7) and (7 ') can move in and out. In the gas burner ring burner provided at equal intervals toward the center of (7 '), the nozzles (2) are arranged in multiple rows in the axial direction of the steel materials (7), (7'). A gas burner ring burner characterized in that a tube (6) in which a cooling medium such as liquid nitrogen is circulated is wound around each nozzle (2). 3. A large number of cylinders (3) for securing a burned width (heating range) of the steel materials (7), (7 ') are fixed to the side surface of the ring body (1), and the ring body (1) is also fixed. At right angles and communicate with
The cylinder (3) is formed by appropriately arranging a predetermined number of nozzles (2) on the axis of the steel materials (7), (7 ').
Ring burner for gas pressure welding as described. 4. The ring burner for gas pressure welding according to claim 3, wherein the positions of the nozzles (2) arranged adjacent to the cylinder (3) are staggered.