JPS6023104Y2 - Pipe end welding equipment - Google Patents

Description

[Detailed explanation of the invention] This invention is a heat exchanger in which a large number of tubes are installed through a tube sheet, and the tube sheet and the ends of the tubes are sequentially welded. , relates to a tube end welding device.

Conventionally, in this type of welding, in order to position the welding head at the same position as the pipe, a centering fitting attached to the welding head was inserted into the pipe, and the welding worker supported the welding head with his hands, or the welding head was placed on a balancer, etc. This was done by hanging it up and supporting it with your hands.

However, with this method of supporting the welding head, there is a problem in that the welding head is easily displaced in the vertical direction, left-right direction, and front-back direction.

In addition, in large-scale welding products, there are thousands of welding points,
There was a problem in that holding the welding head caused great fatigue to the welding operator.

This idea was made to eliminate the above-mentioned drawbacks of the conventional method.The welding head is mounted and held on a simple jig that is directly attached to the workpiece itself, and a positioning pin is attached to this jig. Furthermore, it is an object of the present invention to provide a welding device that can stably attach the torch mount 6 to the surface of the tube plate and perform welding by expanding the positioning pin inserted into the tube inside the tube and making it tightly fit.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 1, 1 is a tube plate which is an object to be welded, 2 is a pipe which is an object to be welded and inserted into a through hole of the tube sheet 1, 3 is a welding head for welding the tube sheet 1 and the tube 2, and 4 is a welding head. A welding torch 5 attached to the rotating part of the welding head 3 connects the welding head 3 to the pipe 2
In order to perform positioning and centering concentrically with the centering metal fitting, 6 is a torch mount arranged parallel to the tube plate 1, and 6a is slidably attached in a direction parallel to the tube plate 1 and orthogonal to the torch mount 6. The left-right axis, 6b is parallel to the tube plate 1 and the left-right axis 6
a vertical shaft slidably mounted in a direction perpendicular to a;
Reference numeral 6c indicates a front-rear shaft on which the welding head 3 is mounted, which is slidably mounted in a direction perpendicular to the tube plate 1 and perpendicular to the vertical shaft 6b.

In FIG. 2, reference numeral 9 denotes a holder attached to the torch mandrel 6, 11 denotes a retraction shaft with a protrusion at one end, and 10 abuts against the protrusion of the retraction shaft 11. The provided elastic body 12 is loosely inserted into the pull-in shaft 11, and is a stopper that comes into contact with the tube plate 1 and the elastic body 10 when the pull-in shaft 11 is inserted into the tube 2, and the holder 9
is in contact with

13 is an eccentric cam, 14 is a lever that operates the eccentric cam,
Reference numeral 15 indicates a pin connecting one end of the retraction shaft 11 and the eccentric cam 13, and reference numeral 16 indicates a bush that is fitted inside the elastic body 10 and slides on the retraction shaft 11.

Next, the operation will be explained.

First, the torch mount 6 is suspended by a hoist (not shown) or the like and transported to the position of the object to be welded.

Next, the elastic body 10 is inserted into the tube 2 hole together with the holder 9 until the collar of the stopper 12 contacts the surface of the tube plate 1.

Next, move the lever 14 in the direction of arrow A to
When the retraction shaft 11 is pulled toward the user by 3, both ends of the elastic body 10 (generally made of rubber material) are compressed and expanded in the direction of arrow B.

This expansion force is used as a fixing force for the positioning pin.

The bushing 16 has the function of making it easier to insert and remove the positioning pin by allowing the elastic body 10 that expands and comes into close contact with it to be easily contracted when the positioning pin is removed.

Next, the welding head 11 is moved vertically, horizontally and horizontally to the shafts 6a and 6b.
After positioning is performed by moving the welding head 11 along the axis 6C in the front-back direction, the locking mechanism 7 is operated to position and fix the welding head 11.

In addition, positioning may vary due to changes in the arrangement of pin tube 2, spacing, etc.
It has a structure that allows it to be adjusted horizontally and vertically.

Tube end welding is performed in this state. As described above, according to this invention, it is possible to reliably fix the welding device to one surface of the tube plate with a simple mechanism, and it is also possible to easily install the welding device, thereby achieving the effect that reliable welding can be performed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of this invention, and FIG. 2 is an enlarged view of a positioning pin. 1...Tube plate, 2...Tube, 3...
・Welding head, 4... Welding torch, 5...
...Centering fitting, 6...Sliding positioning mechanism, 9.
...Holder, 10...Elastic body, 11.
...Retraction shaft, 12 ...Stopper, 13
...Eccentric cam, 14...Lever, 15
. . . Pins. The same reference numerals in the drawings indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] In a tube end welding device that welds a tube sheet through which a large number of tubes are arranged and the tube ends of the tubes, a torch mount arranged parallel to the tube sheet, and a torch mount parallel to the tube sheet and connected to the torch mount. The left and right shafts are slidably mounted in orthogonal directions, the vertical shafts are slidably mounted parallel to the tube sheet and perpendicular to the left and right axes, and the vertical shafts are mounted in a direction perpendicular to the tube sheet and perpendicular to the vertical axis. A sliding positioning mechanism that guides the welding head in three-dimensional directions is composed of a front and rear shaft that is slidably attached in the direction of the welding shaft and on which the welding head is mounted.A sliding positioning mechanism that guides the welding head in three-dimensional directions; an elastic body abutting and slidably surrounding the retraction shaft; a stopper that is loosely inserted into the retraction shaft and abuts against the tube plate and the elastic body when the retraction shaft is inserted into the pipe; It is composed of an eccentric cam that rotates around a pin as a rotating shaft provided to pull out the retraction shaft from the inside of the tube and press the elastic body against the inside of the tube, and a lever that rotates the eccentric cam. A tube end welding device characterized by comprising a positioning pin attached to a positioning mechanism.