JPS5858774B2 - Automatic tip-off method for exhaust pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for automatic tip-off of an exhaust pipe in an annular fluorescent lamp.

Generally, the tip-off portion of the exhaust pipe in this type of annular fluorescent lamp is heated and fused with a burner.

Specifically, the neck part of the annularly curved valve is gripped by a chuck member, and when the valve is transferred to the tip-off position and stopped, the heating burner waiting at the tip-off position is inserted into the exhaust pipe. A predetermined portion is heated and softened and tipped off.

However, depending on the bending condition of the valve or the precision of the parts, the burner may not always be located at a certain distance from the end face (sealing face) of the valve, and therefore the tip-off position varies, and furthermore, the location where tip-off should be If the burner is too close to the sealing surface, the sealing surface will be undesirably heated by the rebound of the flame, making it more likely to crack.

In particular, when the exhaust pipe is heated from two opposing directions, the frame bounces back violently and cracks on the sealing surface are more likely to occur.

To this end, a method can be considered in which the exhaust pipe is heated on one side at a time at the first and second stations, and then tipped off at the second station.In this case, the heating points at the first and second stations are mutually heated. It must be in a corresponding location,
In particular, there is a problem in that it becomes more difficult to adjust the heating position.

In view of these points, the present invention provides an automatic tip-off method for an exhaust pipe that can reliably heat-weld a fixed position from the sealing surface of the exhaust pipe and effectively reduce crack defects. An example will be described.

In Figures 1 and 2, reference numeral 1 is an annularly curved valve, and a neck part 2 having a certain dimension from the sealing surface 1 is around the turntable of an exhaust system (not shown). It is gripped and held by a chuck member 3 fixed to.

An exhaust pipe 4 extending from the valve 1 is attached to the head of the exhaust system.

Reference numeral 5 denotes a burner having a pair of nozzles 6 spaced apart from each other so as to face the exhaust pipe 4 extending from the valve 1, and the figure shows a burner constructed of two parallel burners.

The burner 5 is placed on a table member 8 that is moved by a first cylinder 7 so as to swing vertically about a shaft 9 as a fulcrum.

10 is a second cylinder for swinging the burner 5 in the vertical direction, and is held on the base member 8 by a suitable mechanism.

In the above configuration, if the burner 5 is located in the movement locus of the valve 1, the exhaust pipe 4 will collide and break, so the first cylinder 7 retreats to a position where it does not interfere with the arrival of the valve 1, and the second cylinder 7 The nozzle portion of the cylinder 10 is lifted upward.

When the valve 1 gripped by the chuck member 3 is transferred to the tip-off position and stopped, the base member 8 approaches the valve in the first cylinder 7, and the second cylinder 1 is moved to the tip-off position at the end of movement position.
0, the nozzle portion of the burner 5 swings downward, and the lower surface of the burner 5 comes into contact with the sealing surface 1' and stops.

That is, the nozzle 6 of the burner 5 comes to rest at a position a certain distance apart from the sealing surface 1'.

In this state, a portion of the exhaust pipe 4 is heated and fused.

In the above explanation, the reference surface is the sealing surface of the valve, but a part of the chuck member may also be used as the reference surface.

Alternatively, one burner may be used so as to heat one side of the exhaust pipe, and two stations may be used to heat one side of the exhaust pipe facing each other, and the burner may be configured to be fused at a second position.

That is, in the first position, one side of the exhaust pipe is heated and softened,
The portion may be sucked inward by the suction action of the negative pressure acting within the valve, and the corresponding surface may be heated and softened in the second position to be fused.

As mentioned above, heating one side at a time with a single burner reduces frame rebound and drastically reduces the occurrence of cracks on the sealing surface.

As described above, according to the present invention, since the exhaust pipe portion that is a certain distance away from the sealing surface is heated and fused, it is possible to effectively reduce crack defects in the sealing surface due to rebound of the frame.

In particular, when a method is adopted in which the exhaust pipe is heated one side at a time in two positions, the heating position at each position is always constant, and as a result, the exhaust pipe is reliably heated and fused, and crack defects can be further reduced.

[Brief explanation of the drawing]

The drawings show an example of an apparatus for carrying out the method of the present invention, in which FIG. 1 is a side view and FIG. 2 is a plan view. 1...Valve, 1'...Seal surface, 3
...Chuck member, 5...Burner, 6
······nozzle.

Claims (1)

[Claims] 1. A nozzle is separated so as to face an exhaust pipe extending from the valve on a table member which is curved in an annular shape and moves back and forth with respect to the valve which is held by a chuck member at a position a certain distance from the sealing surface. A burner arranged with a nozzle section is pivoted so that it can swing freely in the vertical direction, and the burner is moved forward by a base member with the nozzle section positioned upward, and the burner is The automatic tip-off of the exhaust pipe is characterized in that the tip is brought into contact with the sealing surface of the valve or the reference surface of the chuck member surface by swinging downward, and the portion of the exhaust pipe that is a certain distance away from the reference surface is heated and fused. Method.