JPS5818014Y2 - Gas valve for gas welding machine - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a gas valve for a gas welding machine.

In a general gas welding machine, flammable gases such as acetylene, hydrogen, coal gas, etc. and oxygen are each fed to a welding torch through gas valves, and this welding torch produces a combustion flame of the mixture of both gases. There is.

On the other hand, the gas valve rotatably supports an opening/closing lever with a hook-shaped welding torch hook formed at one end, and when the welding torch is stopped at this hook, the opening/closing lever rotates and moves inside the valve. The seat valve of the seat valve is closed to stop the gas supply to the welding torch, and a so-called pilot gas passage is branched from upstream of the seat valve, and the pilot burner is burned regardless of whether the seat valve is opened or closed. A welding torch was being ignited.

However, there was a problem in that the pilot burner was extinguished by the blast when the welding torch was ignited.

The present invention has been devised in view of the above points, and embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 designates a valve body, which includes a gas inlet passage 4 having a gas port 2 at one end and a valve port 3 at the other end, a bypass passage 5 formed on the coaxial outer periphery of the other end of this inlet passage, and one end connected to this A plurality of gas passages 8 are line-symmetrically formed, each consisting of a gas outlet passage 7 that communicates with the bypass passage and has an outlet 6 formed at the other end, and a bypass passage is provided on the peripheral wall of the other end of the gas inlet passage 2. An adjustment hole 9 is bored in communication with the valve port 5, and a control valve 10 that is operated from the outside and moves back and forth inside the hole 9 to narrow the hole 9 is provided opposite to the adjustment hole 9. A seat valve 11 is provided to be slidable in the vertical direction, and a spindle 12 whose end portion projects outward is interlocked with the seat valve via a spring 13.

Reference numeral 14 denotes an opening/closing lever whose one end is rotatably supported by a pin 15 on the upper surface of the valve body 1, and which is installed horizontally and whose bottom surface is in contact with the end of the spindle 15. A hook-shaped hook portion 16 is integrally formed at the end.

Therefore, when using it, add acetylene to one gas population 2.
Connect a combustible gas supply pipe (not shown) such as hydrogen, and connect an oxygen supply pipe (not shown) to the other gas inlet 2'.
After connecting the gas pipes to the welding torch corresponding to the gas outlets 6 and 6', the supply of each gas is started and the welding torch is ignited to produce a combustion flame.

In addition, when discontinuing the use of the torch, the torch can be locked to the latch 16 of the opening/closing lever 14 and the opening/closing lever 1 can be stopped.
Spindle 12.12 and spring 13.13' at 4
- The seat valves 11 and 11' are respectively lowered and the seat valves 11.
The valve ports 5, 5' are closed at 11'.

Then, the gas is supplied to the welding torch after its flow rate is reduced to an appropriate amount (adjusted by a regulating valve) through the regulating hole 10, 10', and the welding torch continues to burn while forming a small combustion flame.

Furthermore, when starting the welding operation again, by removing the welding torch from the hook 16, an appropriate amount of gas is supplied through the gas inflow path 4, and the welding operation can be started immediately.

As mentioned above, the gas valve of the gas welding machine according to the present invention has a pilot flame bypass flow path in parallel with the seat valve of each gas flow path, and a control valve for adjusting the flow rate in each flow path. When the torch is not in use, by locking the welding torch to the locking part of the opening/closing lever and adjusting the flow rate in advance with each control valve, an appropriate small amount of fuel and oxygen can be delivered to the torch via each bypass flow path. This allows the torch to continue burning, eliminating the need for a pilot flame like in the past, as well as eliminating the need to adjust the amount of gas in the welding torch associated with ignition, increasing work efficiency. be.

[Brief explanation of drawings]

The drawing is a sectional view of a gas valve of a gas welding machine according to the present invention. 5.5'...Bypass passage, 8,8'...
...Gas flow path, 10°10'...Control valve, 14
......Opening/closing lever, 16...Latching part.

Claims (1)

[Scope of utility model registration request] A flow path for fuel and oxygen leading to the welding torch is provided, and each flow path is provided with a seat valve that is controlled to open and close by a rotating lever, and the seat valve is closed by hooking the welding torch to this lever. In the gas valve of the gas welding machine, a bypass flow path for a pilot flame is provided in each of the flow paths in parallel with the seat valve, and a control valve for adjusting the flow rate is provided in each of the bypass flow paths. A gas valve for a gas welding machine featuring: