KR101583481B1 - Welding Device For Fuel Gas Economizer Type - Google Patents

Abstract

The present invention relates to a fuel saving gas welding device comprising: a supply of oxygen gas supplying oxygen gas to a welding torch (3); a supply of fuel gas supplying a fuel gas to the welding torch (3); and a supply of ignition gas supplying a spark necessary to ignite the welding torch (3); and a control means (2) preventing a reverse flow and flashback by discharging the fuel gas delayed for 0.2-1 seconds from the oxygen gas. With the fuel gas (e.g., acetylene gas) being supplied 0.2-1 seconds later than the oxygen gas using a delay timer (T), a relay (Ry), a switch (12), and a solenoid valve (S1, S2); the effects of reverse flow and flashbacks in the welding torch (3) are prevented in the present invention, saving of fuel gas of more than 30% is realized, and increases in productivity by more than 30%.

Description

[0001] Welding Device for Fuel Gas Economizer [0002]

[0001] The present invention relates to a gas welding apparatus in which fuel (gas) is saved, more specifically, to prevent the backflow and backfire of the gas by preventing the fuel gas from being delayed with respect to the oxygen gas, Productivity is greatly improved.

Generally, oxygen welding is mainly used when welding or cutting metals or non-metals.

The oxygen welding is performed by discharging oxygen, acetylene, or a mixture of oxygen and hydrogen with a welding torch of a welding torch, and firing the mixed gas to be welded to weld or cut the portion to be welded.

On the other hand, in the conventional welding torch, oxygen or oxygen, which is a delayed gas supplied to the mixing chamber, flows into the fuel tank (acetylene tank) while flowing backward and backward through the gas channel, In order to prevent this, there is a problem that a backflow prevention device such as a check valve is attached to the fuel tank to prevent backflow and backflow of gas that may occur during welding. However, since the safety is insufficient, In addition, there is an inconvenience that the welding torch must be ignited by using a lighter or the like every time the welding torch is ignited. In addition, there are problems such as a decrease in productivity due to an increase in working time, and a loss of fuel gas.

Korean Utility Model Registration No. 20-0457756 (name of design: a safety valve device for a gas-saving regulator for welding machine, 2012. 01. 02. Utility Model Application Bulletin) Korean Patent Publication No. 10-0949057 (entitled: Gas Control Valve for Torch, Patent Bulletin, Mar. 25, 2010) Korean Patent Publication No. 10-1196183 (entitled "Oxygen Cutting Machine with Easy Valve Opening and Closing," issued on Nov. 11, 2012)

An object of the present invention is to provide a fuel-saving gas welding apparatus in which backflow and backfire are prevented by allowing the fuel gas to be supplied later than oxygen gas, and the fuel gas is greatly saved and productivity is improved.

The fuel-saving gas welding apparatus of the present invention comprises an oxygen gas supply section for supplying oxygen gas to a welding torch (3), a fuel gas supply section for supplying a fuel gas to the welding torch (3) An ignition gas supply unit for supplying a flame, and a control means 2 for preventing backflow and backfire by delaying the fuel gas by 0.2 to 1 second delayed from the oxygen gas.

The control means 2 includes a switch 12 of a b contact connected in series to both ends of the power source E and turned on or off according to whether the welding torch 3 is stationed or not, A first solenoid valve S1, a delay timer T connected in parallel to both ends of the first solenoid valve S1 and a contact a of the delay timer T connected in series at both ends of the delay timer T And the relay Ry and the a contact Rya of the relay Ry connected in series at both ends of the relay Ry and the second solenoid valve S2 for interrupting the fuel gas.

The fuel gas supply unit includes a second solenoid valve S2, a borax mixer K, a distributor U, a pressure regulator R3, and a fuel gas tank 3, which are in turn connected to a fuel gas supply pipe of the welding torch 3, And a valve V4 of the AT.

The digital pressure switch (D1) further includes a digital pressure switch (D1) (D2) connected to the distributor (U), wherein the ejection amount (supply amount or discharge amount) The digital pressure switch D2 may display the remaining amount of the fuel gas by a plurality of digits.

The amount of fuel gas ejection amount (supplied amount or amount of discharge) data and the remaining amount data of the fuel gas, which are numerically displayed by the digital pressure switches D1 and D2, can be transferred to the computer through the input / output interface.

The ignition gas supply unit includes a ball valve V1 positioned in the vicinity of the welding torch 3 so as to ignite the welding torch 3 and connected to the ignition tube 11 in which the ignition flame 10 is generated, (R1), and a valve (V2) of the ignition gas tank (LPG).

The present invention further includes a mounting table 4 on which a welding torch 3 is mounted, the mounting table 4 having a support rod 15 of a predetermined height vertically fixed to the upper surface of the support 14, A stationary bar 17 fixed to the upper end of the support rod 15 and fixed to the welding torch 3; a switch 12 of the b contact provided on one side of the support bar 15; An operation member 18 for raising or lowering the b contact of the switch 12 according to whether the torch 3 is stationed or not and turning on the b contact of the switch 12, And may further include a connection line 19 of the switch 12.

According to the present invention, the fuel gas is delayed by 0.2 to 1 second from the oxygen gas by the delay timer (T) of the control means (2), and the backward flow and backfire of the gas are prevented, And the productivity is improved by 30% or more.

The welding gas is automatically cut off by the ON operation of the switch 12 when the welding torch 3 is placed on the mount 4 and the welding torch 3 is taken out of the mount 4 for using the welding torch 3 Since the welding gas is automatically supplied by the off-operation of the raising surface switch 12, the welding torch 3 can be easily ignited because the ignition flame 10 of the ignition gas supply unit is always provided, The productivity is improved.

According to the present invention, it is possible to prevent a safety accident such as a gas tank explosion due to backflow and backfire prevention, so that the safety is greatly improved and the welding worker can reliably concentrate on the welding work.

The present invention can be replaced and monitored while real-time monitoring of the amount of fuel gas, such as the amount of acetylene gas to be injected (supply amount, discharge amount or amount of use) and residual amount (residual amount), using digital pressure switches D1 and D2 or a digital manifold gauge, It is possible to predict and warn the timing (consumption timing) accurately.

The present invention is an extremely useful invention having an effect of excellent welding quality, no scaling, and improved productivity because oxygen and acetylene are used as the welding gas.

1 is a configuration diagram showing an example of the present invention.
2 is a block diagram of the control means shown as one example of the present invention.
Fig. 3 is a perspective view of the welding torch holder shown in an example of the present invention, in which the welding torch is placed on a holder and the switch of the b contact is turned off.
Fig. 4 is a perspective view of a welding torch holder shown in an example of the present invention, in which the switch of the b contact is turned on by the use of the welding torch (unstable state).

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the embodiments of the present invention, the same components as in the drawings are denoted by the same reference numerals as possible, and detailed descriptions of known configurations and functions are omitted so as not to obscure the gist of the present invention. May be different from what is actually implemented with the schematized drawings in order to easily describe the embodiments of the present invention.

FIG. 1 is a configuration diagram of a fuel-saving type gas welding apparatus 1 according to the present invention. FIG. 2 is a schematic view showing a control means 2 (see FIG. 1) for preventing reverse flow and backfire by delaying a fuel gas (for example, acetylene gas) 3 and 4 are perspective views of a cradle 4 on which the welding torch 3 is mounted.

As shown in Fig. 1, the fuel-saving gas welding apparatus 1 according to the present invention includes a welding torch 3, an oxygen gas supply unit for supplying oxygen gas to the welding torch 3, An ignition gas supply part for supplying an ignition flame 10 with a gas (LPG or the like) necessary for ignition of the welding torch 3; and a fuel gas supply part for supplying the fuel gas to the fuel gas for 0.2 to 1 second And a control means (2) for preventing backfire by delayed discharge (supply).

The fuel gas may include acetylene gas, LPG gas, and argon gas. In the present invention, acetylene gas is exemplified. LPG gas is inexpensive, but its use as a welding gas is inadequate because it reduces work and productivity, creates scales in hoses or tubes, and degrades welding efficiency and quality. Therefore, by using acetylene gas instead of the LPG gas, it can be effectively used for ignition of the welding torch 3, which is preferable from the viewpoint of cost.

The welding torch 3 includes an oxygen gas control valve 5 and its control knob, a fuel gas control valve 6 and its control knob, a combustible gas such as acetylene and oxygen mixed with each other to form a welding gas An injector 8 for injecting the mixed welding gas into the outside air and a burner 9 for generating a welding flame when the flame is ignited in the welding gas injected from the injector 8 And welded or cut the portion to be welded.

The oxygen gas supply unit supplies the first solenoid valve S1, the pressure regulator R2 and the valve V2 of the oxygen gas tank OT by using a hose to the oxygen gas supply pipe formed at the rear end of the welding torch 3 And the oxygen gas is supplied to the welding torch 3 and the oxygen gas supply amount is adjusted by the valve V2 and the oxygen gas control valve 5. [

The fuel gas supply unit is connected to a fuel gas supply pipe constituted at the rear end of the welding torch 3 through a distributor (not shown) to which a second solenoid valve S2, a borax mixer K, and digital pressure switches D1 and D2 are connected U and the valve V4 of the pressure regulator R3 and the fuel gas tank AT are connected in turn by the hose to supply the fuel gas to the welding torch 3 and the valve V4 and the fuel gas regulating valve 6 or the fuel gas supply amount is regulated by the valve V4, the fuel gas regulating valve 6 and the digital pressure switches D1, D2.

The borax mixer K is filled with borax in the vessel and the borax is mixed into the fuel gas and then supplied to the welding torch 3. Ball valves V5 and V6 are provided on both sides of the borax mixer K And when the borax is exhausted (consumed), the gas flow path can be closed.

The present invention may further include a digital manifold gauge connected to the distributor U or a digital pressure switch D1 or D2 to measure the ejection amount of the fuel gas such as acetylene gas Or consumption amount) and the remaining amount (residual amount) can be accurately measured in real time to monitor and warn the replacing time (consuming time), and accurately predict and warn the replacement time.

For example, the discharge pressure of the fuel gas can be set by using the digital pressure switch D1 as a numerical display of the number of fuel gas spouted by a plurality of seven-segment (Seven) segments or LCDs, and by using a switch installed. The digital pressure switch D2 can initialize the remaining amount of the fuel gas by using a plurality of 7-segment (Seven) segments or an LCD, and by using a switch installed. The display pressure may be a digital value in units of kg / cm < 2 >.

The fuel gas ejection amount data and fuel gas remaining amount data, which are numerically displayed by the digital pressure switches D1 and D2, are transmitted to an external computer and / or server through an input / output interface such as USB, RS-232, RS- By being configured to be transmitted, it is monitored, automatically monitored and alerted to the computer and / or server without having to be visually confirmed. In addition, although no separate recording has been made in the past, in the present invention, the production amount and schedule can be easily established by real-time monitoring, periodic recording, and computerized processing.

The ignition gas supply unit includes an ignition tube 11, an openable ball valve V1, and a pressure regulator (not shown) which are positioned near the welding torch 3 and generate an ignition flame 10 so as to easily ignite the welding torch 3, R1 and the valve V2 of the ignition gas tank LPG are sequentially connected by the hose to supply the ignition gas to the ignition tube 11. [

2 shows control means 2 for preventing backfire by allowing oxygen gas to be supplied before the fuel gas and is connected in series to both ends of the power source E and is turned on by the welding torch 3 The switch 12 of the b contact and the first solenoid valve S1 for interrupting the oxygen gas; A switch 12 and a first solenoid valve S1 for oxygen gas interrupting, a delay timer T connected in parallel to both ends of the first solenoid valve S1, and a delay connected in series at both ends of the delay timer T. [ The a contact Ta and the relay Ry of the timer T and the a contact Rya of the relay Ry connected in series at both ends of the relay Ry and the second solenoid valve S2 for interrupting the fuel gas .

The delay time due to the delay timer T is preferably 0.2 to 1 second, and if the delay time is less than 0.2 second, backflush may occur, and if the delay time exceeds 1 second Back flame can be surely prevented, but the mixing time and the discharge time of the oxygen gas and the fuel gas are delayed more than necessary, and the welding time and efficiency are lowered, which is not preferable.

3 and 4 are perspective views of the cradle 4 on which the welding torch 3 is mounted and are fixed to the welding workbench 13 or a frame around the workbench 13 by welding or fastening members such as bolts and nuts A support rod 15 fixed to the upper end of the support rod 15 and fixed to the upper end of the support rod 15 and fixed to the upper surface of the pedestal 14 and fixed to the welding torch 3 such as the injector 8 of the welding torch 3 ) And a mounting bar 16 and a mounting bar 17 formed in a U-shape or a V-shape so as to be able to hang a part of the b- 12 of the switch 12 and the b contact of the switch 12 are turned on or off while the welding operation of the welding torch 3 is performed An operating member 18 and a connecting line 19 of the b contact switch 12 connected to the control means 2. [

The connection line 19 is protected from being directly exposed to welding heat by being configured to be drawn out to the side of the pedestal 14 through the inside of the support rod 15. [

The upper end of the mounting portion 16 is formed with a forwardly bent bent portion 20 so that the injector 8 and the cutter 9 of the welding torch 3 can be easily inserted or removed.

The outer diameter of the portion of the welding torch 9 of the welding torch 3 is larger than the outer diameter of the injector 8 so that the welding torch 3 is caught in the fixing rod 17 when the welding torch 3 is mounted on the mounting table 4.

The operation member 18 is resiliently biased by a spring (not shown) provided inside the switch 12. When the welding torch 3 is mounted on the mounting table 4 as shown in Fig. 3, by the weight of the welding torch 3 The switch 12 of the contact b is turned off while the operation member 18 is lowered and conversely when the welding torch 3 is not used as shown in Fig. 4, the weight of the welding torch 3 is removed The switch 12 of the contact b is turned on and the first and second solenoid valves S1 and S2 are opened while the operation member 18 is lifted by the spring action of a spring (not shown) Are simultaneously opened, the gas flow path is opened and the fire wall 9 is ignited.

In the present invention, the LPG gas at an appropriate pressure is ejected to the ignition tube 11 located near the burning port 9 so that the welding torch 3 can be ignited at any time, and the state in which the ignition flame is ignited is maintained, The LPG gas ejection amount and the intensity of the ignition flame are set by the control valve V2. When the ignition flame is to be turned off, the LPG gas is prevented from being ejected by the ball valve (V1) The LPG gas can be prevented from being jetted to the valve V2 of the tank LPG.

The use state of the present invention will be described as follows.

First, in a state where the ignition flame 10 is prepared by ejecting the LPG gas at an appropriate pressure into the ignition tube 11 located near the burning port 9 so that the welding torch 3 can be ignited at any time, When the worker lifts the welding torch 3 of the cradle 4 as shown in Fig. 3B, the operating member 18 of the switch 12 rises and the contact b is turned on, and the power source E of the control means 2 The first solenoid valve S1 and the delay timer T are supplied to operate the first solenoid valve S1 and the second solenoid valve S1 so that the gas flow path is opened by the operation of the first solenoid valve S1, And the a contact Ta of the delay timer T is turned on 0.2 to 1 second after the first solenoid valve S1 is operated by the delay timer T and the relay Ry And the a contact Rya of the relay Ry is turned on so that the second solenoid valve S2 is operated to open the gas flow path The fuel gas in the fuel gas tank AT is supplied to the welding torch 3 so that the backflow and backfire of the gas are prevented and the oxygen gas and the fuel gas are mixed with each other in the mixing chamber 7 of the welding torch 3 The gas is injected into the furnace 9 through the injector 8 and the welding gas is ignited by the ignition flame 10 around the furnace 9 so that the welded portion is welded or cut.

In the present invention, oxygen gas is first supplied and discharged by the operation of the first solenoid valve S1, the second solenoid valve S2 is operated after a delay of about 0.2 to 1 second by the delay timer T, The backflow and backfire of the gas are prevented and the safety accident such as the explosion of the gas tank is prevented in advance. Therefore, the safety is greatly improved, the welding worker can concentrate on the welding work with peace of mind, Is supplied earlier than the fuel gas, the fuel gas can be saved by 30% or more, thereby reducing the welding cost.

In addition, backflow and backfire of the gas are prevented and the welding torch 3 is ignited immediately by the ignition flame 10, so that it is not necessary to call the welding torch 3 by using a lighter or the like, Productivity is greatly improved by more than 30%.

On the other hand, when the welding or cutting is temporarily stopped or completed and the operator places the welding torch 3 on the mounting portion 16 of the mounting table 4, the weight of the welding torch 3 causes the operation member 18 The b contact is turned off and the supply of the power supply E of the control means 2 is interrupted (blocked), so that the first solenoid valve S1, the delay timer T, the relay Ry, The operation of the solenoid valve S2 is stopped (stopped), the gas flow path is closed, and the supply of the oxygen gas and the fuel gas is stopped, so that the flame of the furnace 9 is turned off.

The welding gas is automatically cut off by the on operation of the switch 12 when the welding torch 3 is mounted on the mount 4 and the welding torch 3 is taken out of the mount 4 for using the welding torch 3 Since the welding gas is automatically supplied by the off-operation of the lift-up switch 12, it is easy to use and automatic ignition is achieved with the ignition flame 10 normally provided by the ignition gas supply unit.

The present invention has excellent workability, safe use, saving of fuel gas by 30% or more, and productivity of 30% or more by preventing reverse flow and backfilling of gas.

According to the present invention, it is possible to prevent a safety accident such as explosion of a gas tank by preventing backflow and backfire, so that not only the safety is greatly improved, but also the welding worker can concentrate on the welding work with peace of mind.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It is self-evident to those of ordinary skill.

(1) - gas welding device (2) - control means
(3) - welding torch (4) - cradle
(5) - Oxygen gas control valve (6) - Fuel gas control valve
(7) - Mixing chamber (8) - Injector
(9) - Coke (10) - Ignition flame
(11) - Ignition tube (12) - Switch
(13) - worktable (14) - pedestal
(15) - support rod (16) - mounting part
(17) -stem rod (18) -operating member
(19) -connecting line (20) -bending section
(AT) - Fuel gas tank (D1) (D2) - Digital pressure switch
(K) - Borax mixer (LPG) - Ignition gas tank
(OT) - oxygen gas tank (R1) (R2) (R3) - pressure regulator
(Ry) - relay (Rya) - relay (Ry) a contact
(S1) (S2) - Solenoid valve (U) - Dispenser
(V1) (V2) (V3) (V4) (V5) (V6) - Valve (T) - Delay timer
(Ta) - the a contact of the delay timer (T)

Claims (7)

An oxygen gas supply unit for supplying oxygen gas to the welding torch 3;
A fuel gas supply unit for supplying a fuel gas to the welding torch 3;
An ignition gas supply part for supplying a spark necessary for ignition of the welding torch (3);
A control means (2) for retarding the fuel gas by 0.2 to 1 second delayed from the oxygen gas to prevent backflow and backfire of the gas; ≪ / RTI >
The control means (2)
A switch 12 of a b contact and a first solenoid valve S1 for oxygen gas interrupting which are connected in series to both ends of the power source E and are turned on / off according to whether the welding torch 3 is stationary or not;
A delay timer T connected in parallel to both ends of the first solenoid valve S1;
A contact (Ta) and a relay (Ry) of a delay timer (T) connected in series across the delay timer (T);
An a contact Rya of the relay Ry connected in series to both ends of the relay Ry and a second solenoid valve S2 for interrupting the fuel gas;
Wherein the gas-fired gas is a gas. delete The method of claim 1,
The fuel gas supply unit,
A second solenoid valve S2 connected in turn to the fuel gas supply pipe of the welding torch 3, a borax mixer K, a distributor U, a valve (not shown) of the pressure regulator R3 and a fuel gas tank AT V4). ≪ / RTI > The method of claim 3,
Further comprising a digital pressure switch (D1) (D2) connected to the distributor (U)
The digital pressure switch (D1) is configured such that the ejection amount of the fuel gas is represented by a plurality of digits,
Wherein the digital pressure switch (D2) is configured such that the remaining amount of the fuel gas is indicated by a plurality of digits. The method of claim 4,
Fuel gas discharge amount data and fuel gas residual amount data, which are numerically represented by digital pressure switches (D1) and (D2), are transferred to a computer through an input / output interface. The method of claim 1,
The ignition gas supply unit includes a ball valve V1 positioned near the welding torch 3 and connected to the ignition tube 11 in which the ignition flame 10 is generated so as to ignite the welding torch 3, R1) and a valve (V2) of an ignition gas tank (LPG). The method of claim 1,
A cradle (4) on which the welding torch (3) is mounted; Further comprising:
The cradle (4)
A support rod 15 of a predetermined height vertically fixed to the upper surface of the pedestal 14;
A fixing rod 17 fixed to the upper end of the support rod 15 and to which the welding torch 3 is fixed;
A switch 12 of a b contact provided on one side of the upper side of the support bar 15;
an operation member 18 which is provided on the switch 12 of the contact b and raises or lowers according to whether the welding torch 3 is stationed or not and turns on / off the contact b of the switch 12, ;
A connecting line 19 of the b contact switch 12 connected to the control means 2;
Wherein the gas-fired gas-welding device comprises:

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