JPS58224229A - Control method of welding device - Google Patents

Abstract

PURPOSE:To prevent adverse welding operations such as a back fire, abrupt ignition and a lifting phenomenon, by a method wherein the electromagnetic valve of oxygen side is first closed, and the electromagnetic valve is opened with the delay of few seconds after a take-up timing, whereas the electromagnetic valve of acetylene side is first opened and the electromagnetic valve of oxygen side is opened with the delay of few seconds. CONSTITUTION:When a welding operation being temporarily suspended, a micro- switch 11 is turned ON upon a cutting tip 13 being placed on a cutting tip mounting table 10, and thereby first closing the electromagnetic valve 9 of oxygen side and then the electromagnetic valve 8 of acetylene side. In re-starting the welding operation, the cutting tip is raised upwardly with the aid of a manual operation. At this moment, if a touch sensor is contacted by a finger, an automatic ignition device is actuated to output to a lighter 16 a signal instructive of ignition start-up. At the same time, if the cutting tip 13 is taken up, the micro-switch 11 is turned OFF and the electromagnetic valve 8 of acetylene side is opened in a few seconds later. Then, the electromagnetic valve 9 of oxygen side is caused to open with a delay. In this manner, it is made possible to suppress the occurrance of back fire, abrupt ignition and lifting phenomenon.

Description

Detailed Description of the Invention The present invention is a welding device (Japanese Patent Application No. 57-82635) proposed for the purpose of energy saving, safety, and work efficiency.
The present invention relates to a control method.

Japanese Patent Application No. 57-82635 discloses that connection fittings are attached to the acetylene cylinder and oxygen cylinder sides, and vent side connection fittings are connected to the vent (blowpipe) side respectively, and these fittings are connected by guiding each other, and the conduit is connected. A solenoid valve is used for each part, and the solenoid valve can be turned on or off according to the usage status of the crater.
When a lit crater is placed in a predetermined location, the solenoid valve closes to extinguish the fire, and when the crater is removed from the designated location, the solenoid valve opens to supply acetylene and oxygen.

In the case of the above-mentioned welding equipment, if the solenoid valves on the acetylene and oxygen sides are closed at the same time when the crater is placed in a predetermined position, the pressure on the oxygen side is high, so a backfire phenomenon occurs on the acetylene side.
It's very dangerous. The first purpose of the present invention is to prevent this flashback phenomenon.

Next, when you pick up the crater from its designated position, open the solenoid valve at the same time, and then use a lighter to ignite it. There is a time period of several seconds while the crater is brought to the lighter.
During this time, acetylene and oxygen are spewing out and a rapid flame is formed when ignited, which is also very dangerous. The second purpose of the present invention is to suppress this sudden ignition phenomenon.

Next, when the crater is brought to a lighter and acetyleno and It elements are ejected at the same time, the pressure on the oxygen side is high, resulting in excess oxygen and a lift in the flame.

The third purpose of the present invention is to suppress this lift phenomenon.

In order to prevent backfire, which is the first object of the present invention,
The solenoid valve on the oxygen side was closed first.

In order to prevent sudden ignition, which is the second objective, even if the crater is picked up from a predetermined position, the solenoid valve is opened several seconds later than the timing of picking up the crater. Furthermore, in order to prevent lift, which is the third objective, the solenoid valve on the acetylene side was opened first, and the solenoid valve on the oxygen side was opened later.

According to the present invention, the control described above can be performed by an electric circuit, and an embodiment thereof will be described in detail below.

FIG. 1 is a plan view of a welding device in which the present invention is implemented.
A metal fitting 2 for connecting to an oxygen cylinder (not shown) and a metal fitting 3 for connecting to an acetylene cylinder (Fig. 4, not shown) are exposed and attached to one side of the case ■. is installed with the metal fitting 4.5 for connection to the crater exposed. And the connection fittings 2.3 and 4.5
and are connected by conduits 6 and 7 in the case l, respectively.

8.9 is a solenoid valve installed in a part of the conduit 6.7 to turn on the passage of oxygen and acetylene in the conduit 6.7.
, turns off.

Reference numeral 10 denotes a crater holder constructed on the side of the case 1, and this holder 10 has a built-in microswitch 11. When the crater 13 is placed on the crater holder 10, this microswitch is turned on, and the solenoid valve 8. 9 is closed to cut off the flow of oxygen and acetylene, and when the crater 13 is taken up from the crater holder 10, the microswitch 11 is turned off and the solenoid valve 8.9 is opened. 12 is a metal band that holds down the crater 13, and 14 is a carrying handle attached to the top surface of the case 1.

Reference numeral 15 designates a touch sensor attached to the crater 13, and when a hand touches this, an ignition signal is sent to the lighter 16.

Note that this touch sensor 15 may be replaced with a manual switch. Alternatively, the microswitch 11 may be eliminated and the solenoid valve 8.9 may be operated by the touch sensor 15 or a manual switch, or the ignition operation may be performed simultaneously.

17 is a control device, and this device controls the crater 13. When the micro switch 1 is turned off, the solenoid valve 8 on the acetylene side is opened with a delay of about 3 seconds, and then the oxygen is turned on with a delay of about 1 second. Open the solenoid valve 9 on the side, then place the crater J3 on the crater stand 1.
0, and when the microswitch 11 is turned on, it is an electrical control circuit that first closes the electromagnetic valve 9 on the oxygen side, and closes the electromagnetic valve 8 on the acetylene side about 3 seconds later.

The present invention is constructed as described above, and when welding work is to be temporarily interrupted, when the nozzle 13 is placed on the nozzle stand 10, the microswitch 11 is turned on, first the solenoid valve 9 on the oxygen side is closed, and then the acetylene The side solenoid valve 8 closes. As a result,
Fire 1” J3’s fire goes out.

Next, when moving on to the welding work, place your hand on the crater 13 and lift it up. At this time, when the touch sensor 15 is touched, the automatic ignition device is activated and an ignition signal is sent to the lighter 16. When the crater 13 is picked up at the same time, the microswitch 11 is turned off, and after a delay of several seconds, first the acetylene side solenoid valve 8 opens, and then, a few seconds later, the oxygen side solenoid valve 9 opens. As a result, the crater 13 is ignited.

The crater 13 is equipped with a separate flame adjustment valve, and since this adjustment valve is a borrowed one, rewelding can be performed using the same flame (temperature) K as before the welding was stopped. Note that the micro switch 11 is ON.
The solenoid valve 8.9 may be configured to open when the switch is turned off, and close when the switch is OFF.

In this way, in the present invention, the solenoid valve 8.9 is automatically opened and closed by placing the crater 13 in a predetermined location, so that when work is temporarily interrupted, it is possible to open and close the valve one by one as in the conventional case. There is no need to adjust the valve (temperature control) when closing or reusing.
Therefore, it is possible to improve the efficiency of welding work. In addition, since the fire is extinguished during the interruption, it is possible to save energy, and there is no need to leave the lit crater 13 nearby during the interruption, so there is no risk of an accident occurring.

In the case of the embodiment, the microswitch 11 and the touch sensor 15 are provided separately, and the opening and closing of the solenoid valve 8.9 and the automatic ignition are operated separately, but this is done so that they are automatically operated together. Good too.

Alternatively, the microswitch 11 and the touch sensor 15 may be eliminated, and a switch installed in the vent 13 or other parts may be used to ignite and open and close the solenoid valve 8.9.

In addition, in order to automatically control the ignition at the crater 13 on the safe side, a flame sensor that detects the flame in the crater 13 is installed, and only when flame is detected by this sensor, the solenoid valve 8.9 is held open and the flame is detected. The solenoid valve 8.9 may be closed if it is not detected for, for example, 30 seconds.

Next, in the present invention, when the crater 13 is first placed on the stand 10,
Instead of closing the solenoid valves 8 and 9 at the same time, the solenoid valve 9 on the oxygen side was closed first, and then the solenoid valve 8 on the acetylene side was closed after a delay, so four backfires occurred. 2 months. ,.

Next, in the present invention, when the crater 13 is taken up from the stand lO,
Since the solenoid valve 8.9 does not open immediately, but opens after a delay of several seconds, there is no acetylene or oxygen spewing out while the crater 13 is brought to the lighter 16, and there is therefore a risk of sudden ignition (small explosion). do not have.

Next, when igniting the crater I3, the solenoid valve 8 on the acetylene side opens first, and the solenoid valve 9 on the oxygen side opens later.
There is no need to worry about lift occurring.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view, FIG. 2 is a front view, and FIG. 3 is a side view. 1... Case, 2.3.4.5... Connection fittings, 6.7... Conduit, 8.9... Solenoid valve, 10... Irrigation stand, 11... Micro switch, 12... Band, 13...
Crater, 14... Handle, 15... Touch sensor, 16... Lighter, I7...
· Control device. Agent Patent Attorney Hiroshi Ohashi

Claims (1)

[Claims] Attach the connecting fittings connected to the acetylene cylinder and oxygen cylinder side, respectively, and the vent side connecting fittings connected to the crater (blowpipe) side, respectively, and connect these connecting fittings with a conduit, and connect each of them to a part of the conduit. In a welding device that is equipped with a solenoid valve and is configured to turn the solenoid valve ON and OFF according to the usage status of the crater, the solenoid valve on the oxygen side is closed first, and the solenoid valve on the acetylene side is closed after a delay. control method.