JPH1110329A - Gas welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely form a weak fire in the tip of a torch at the time of being in non-welding position. SOLUTION: This equipment is provided with strong fire duct lines 5, 10 and weak fire duct lines 6, 11 respectively provided in parallel shape on the way to the fuel gas pipe arrangement 4 and the oxygen pipe arrangement 9 leading to the torch 3, the first and second solenoid valves 12, 13 provided in respective strong fire duct lines 5, 10, the third and fourth solenoid valves 14, 15 provided in a series shape in respective weak fire duct lines 6, 11 and needle valves 17, 18. The position detecting means 45, being provided in the torch 3 and moreover detecting that the torch 3 is in either position of the prescribed welding work attitude or non-welding work attitude other than this, is provided. The switching means, wherein the third and fourth solenoid valves 14, 15 of respective weak fire duct lines 6, 11 are opened and the first and second solenoid valves 12, 13 of respective strong fire duct lines 5, 10 are closed when the torch 3 is in non-welding position, while the first and second solenoid valves 12, 13 are opened and the third and fourth solenoid valves 14, 15 are closed when the torch 3 is in the welding position, based on the detected result of the position detecting means 45, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a gas welding apparatus.

[0002] In this specification, the term "gas welding" includes gas cutting and gas brazing.

[0003]

2. Description of the Related Art For example, when performing gas welding on a large number of workpieces continuously conveyed by a conveyor, an operator performs gas welding on one workpiece and then performs the next welding on the workpiece. While waiting until it is sent, the fact that a high flame for gas welding is formed at the crater of the torch of the gas welding device indicates that fuel gas such as acetylene, LP gas, city gas,
Oxygen is wasted, and there is a danger of fire, operator burns, and the like.

[0004] Therefore, as a gas welding apparatus for reducing the use amount of fuel gas and oxygen and reducing the danger of fire, burns, etc., a fuel gas pipe conventionally provided in a torch is used. And a bypass pipe is provided in each of the oxygen pipes, a manual valve is provided in each of the combustion gas pipe and the oxygen pipe, and a flow resistor is provided in each of the bypass pipes, and the combustion gas pipe and the oxygen pipe are provided. Is known in which a single manual valve can be opened and closed by a single lever (see Japanese Patent Application Laid-Open No. 51-28231). In this gas welding device, when both manual valves are opened by levers during gas welding work, a large amount of fuel gas and oxygen flow through the combustion gas line and the oxygen line, and a high flame for gas welding is formed at the crater of the torch. Is done. Also, during standby,
When both the manual valves are closed by the lever, a small amount of fuel gas and oxygen flow through each bypass line, and a low flame is formed at the crater of the torch.

[0005]

However, the conventional gas welding apparatus has a problem that the opening and closing operation of the manual valve by the lever is troublesome. In addition, since the above operation is troublesome, this operation is neglected, and the manual valve is kept open even during standby, so that a high flame is formed at the crater. As a result, the amount of fuel gas and oxygen used can be reduced, and fire, work, etc. There is a problem that it is not possible to reduce the risk of burns and the like of the elderly.

An object of the present invention is to solve the above-mentioned problems and to provide a gas welding apparatus capable of surely forming a low flame at the crater of a torch during standby.

[0007]

Means for Solving the Problems and Effects of the Invention A gas welding apparatus according to the present invention comprises a high-fire pipe and a low-fire pipe provided in parallel in a fuel gas pipe and an oxygen pipe leading to a torch. An on-off valve provided in each high-fire line of the fuel gas pipe and the oxygen pipe, an on-off valve and a flow control valve also provided in series with each low-fire pipe, and a torch, When the torch is in the non-welding work posture, based on the detection result of the posture detection means for detecting which of the predetermined welding work posture and the other non-welding work postures the posture is, Open the on-off valves of the low-fire lines of the fuel gas pipe and the oxygen pipe, close the on-off valves of the high-fire pipes, and close each of the high-fire pipes of the fuel gas pipe and the oxygen pipe when the torch is in the welding position. On-off valve Close-off valves of the respective low heat conduit with Ku in which and a switching means.

According to the gas welding apparatus of the present invention, if the flow control valve of each low-fire pipe is set so that the flow rates of the fuel gas and oxygen flowing through each low-fire pipe are very small,
When the attitude detecting means detects that the torch is in the non-welding work attitude, the switching means opens and closes the open / close valves of each low-fire pipe of the fuel gas pipe and the oxygen pipe, and closes the open / close valves of each high-fire pipe. As a result, a low heat is formed at the crater of the torch. Therefore, saving fuel gas and oxygen, fire,
Workers can be prevented from being burned. Further, the posture detecting means is:
When detecting that the torch is in the welding operation posture, the switching means opens and closes the on-off valves of the high-fire pipes of the fuel gas pipe and the oxygen pipe, and closes the on-off valves of each of the low-fire pipes. Then, oxygen and oxygen flow through each high-fire line, and a high flame is formed at the crater of the torch, so that gas welding can be performed. In addition, since the attitude detecting means automatically detects which of the predetermined welding operation attitude and the other non-welding operation attitude the torch is in,
The worker returns the torch from the welding working posture to the non-welding working posture, and the posture detecting means detects this. Based on the detection result, the switching means switches the fuel gas pipe and the oxygen pipe for each of the low-fire pipes. The open / close valve is opened and the open / close valve of each high-fire line is closed. As a result, a low heat is automatically formed at the crater of the torch. Therefore, fuel gas and oxygen can be saved reliably, and a fire and a burn of an operator can be reliably prevented.

In the gas welding apparatus according to the present invention, the attitude detecting means includes a photoelectric switch having a light emitter and a light receiver arranged in opposition, and a torch swinging at a portion between the light emitter and the light receiver of the photoelectric switch. The light blocking member is freely mounted, and the light blocking member swings relative to the torch when the torch moves between the non-welding work position and the welding work position, thereby forming a light-transmitting member. In some cases, the optical switch is moved between a position where the passage of light to the light receiver is blocked and a position where the passage of light is also permitted, thereby switching the photoelectric switch.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings.

FIG. 1 schematically shows the entire configuration of a gas welding apparatus according to the present invention, FIG. 2 specifically shows the overall configuration of a gas welding apparatus according to the present invention, and FIGS. Is shown. FIG. 6 shows an electric circuit.

In FIG. 1, the gas welding apparatus includes a fuel gas supply source (1), an oxygen supply source (2), and a torch (3). In the middle of the fuel gas pipe (4) that supplies fuel gas from the fuel gas supply source (1) to the torch (3), a high-fire line (5)
And a low-fire line (6) are provided in parallel. In the fuel gas pipe (4), the high-fire line (5) and the low-fire line (6) branch off from the branching part, and
A pilot line (8) for supplying fuel gas is provided at (7). In addition, a high-fire line (10) and a low-fire line (11) are provided in parallel in the middle of an oxygen pipe (9) for supplying oxygen from the oxygen supply source (2) to the torch (3). . The high-fire line (5) (10) and low-fire line (6) (11) and the pilot line (8) of both pipes (4) and (9), ) (14) (15) (1
6) (On-off valve) is provided. Below, fuel gas piping
The solenoid valve (12) of the high-fire line (5) of (4) is the first solenoid valve, the solenoid valve (13) of the high-fire line (10) of the oxygen pipe (9) is the second solenoid valve,
Connect the solenoid valve (14) of the low-fire line (6) of the fuel gas pipe (4) to the third
The solenoid valve, the solenoid valve (15) of the low-fire line (11) of the oxygen pipe (9) is called the fourth solenoid valve, and the solenoid valve (16) of the pilot line (8) is called the fifth solenoid valve. I do. In addition, low-fire pipelines for both pipes (4) and (9)
In (6) and (11), needle valves (17) and (18) (flow regulating valves) are provided in series with the third and fourth solenoid valves (14) and (15), respectively. Both needle valves (17) and (18) are
(6) Make the amount of fuel gas and oxygen flowing through (11) very small,
As a result, the flame formed at the crater (3a) of the torch (3) is adjusted to be a small low flame.

In FIG. 2, which shows a specific overall configuration of the gas welding apparatus, a fuel gas inlet pipe (21) provided in a casing (20) has a hose (22) extending from a fuel gas supply source (1).
However, the oxygen inlet pipe (23) also provided in the casing (20)
Hoses (24) extending from the oxygen supply source (2) are connected to the fuel gas outlet pipe (25) provided in the casing (20) and the fuel gas inlet (2) of the torch (3).
6), oxygen outlet pipe (27) also provided in casing (20)
The hose (29) is connected to the oxygen inlet (28) of the torch (3), respectively.
(30) connected to the fuel gas pipe (4)
And an oxygen pipe (9). Fuel gas piping
(4) and high-fire line (5) (10) and low-fire line (6) (11) in oxygen line (9), and fuel gas line (4)
The part of the pilot line (8) is provided in the casing (20). The pilot fire burner (7) is provided on the upper surface of the casing (20).

A power switch is provided on the casing (20).
(31), a power indicator (32), and a torch hook arm (33) that can move up and down. Arm (33) is a torch
When the torch (3) is hooked, it descends and rises automatically when the torch (3) is detached, and this vertical movement switches a limit switch (not shown).

As shown in FIGS. 2 and 3, the torch (3)
Mixes the fuel gas flowing from the fuel gas inlet (26) with the oxygen flowing from the oxygen inlet (28) and ejects it from the crater (3a) to form a flame at the crater (3a) Needle valve (34) for adjusting the amount of fuel gas in the mixed gas to an appropriate amount necessary to form a high flame suitable for gas welding
(Flow control valve) and a needle valve (35) (flow control valve) for adjusting the amount of oxygen in the mixed gas to an appropriate amount necessary to form a high flame suitable for gas welding. The torch
(3) does not necessarily need to have these needle valves (34) (35); instead, high-fire lines (5) (10) and low-fire lines (6) (6) ( A needle valve may be provided on the downstream side of 11). Although not shown, the fuel gas flows through the grip pipe (3b) via the needle valve (34), and the oxygen flows through the pipe arranged in the grip pipe (3b) and then passes through the needle valve (35). Thereafter, the two are mixed and injected from the crater (3a).

In the torch (3), the torch (3) has a predetermined welding work position and other non-welding positions near the needle valve (34) than the hose connection portion (26a) of the fuel gas inlet (26). Attitude detection means (45) for detecting which of the working attitudes the user is in is provided. In this specification, the welding work posture is defined as a predetermined angle, for example, 20 to the left (in the direction indicated by arrow X in the figure) from the state shown in FIG.
From tilted to upside down,
The non-welding work posture refers to any other state.

As shown in FIGS. 4 and 5, the attitude detecting means (45) is provided with a projector (39) and a photodetector (4
(0), and a torch in a portion between the light emitter (39) and the light receiver (40) of the photoelectric switch (37).
And (3) a light blocking member (41) swingably mounted on the (3). The photoelectric switch (37) is provided in a cylindrical cover (38) fixed to the torch (3). The upper end of the light blocking member (41) is a mounting member (42) fixed to the upper end of the cover (38).
3 and 4 so as to be freely swingable in the left and right directions of FIGS. 3 and 4 by means of a shaft 43 extending in the front and back directions of FIG. Have been. When the torch (3) is tilted to the left in FIGS. 3 and 4, the light blocking member (41) keeps a hanging state due to its own weight, and as a result swings relatively to the torch (3), When the torch (3) is tilted further up to an angle slightly beyond that, it hits the peripheral wall of the cover (38), and even if the torch (3) is further tilted, the torch (3) is turned upside down as shown in FIG. ) Does not swing relative to. A stopper (44) is fixed to the right side of FIG. 4 of the photoelectric switch (37), and the torch (3)
Even if is tilted to the right in FIG. 3, the light blocking member (41) does not swing relatively to the torch (3).
The angle between the light blocking member (41) and the torch (3) is 2
When the angle is less than 0 degrees, the light blocking member (41) is connected to the light emitter (39) and the light receiver (4).
0) is blocked, and when the angle is equal to or more than 20 degrees, the light is also allowed to pass. Accordingly, the light blocking member (41) is located at a position for blocking the passage of light between the light emitter (39) and the light receiver (40) when the torch (3) is in the non-welding work position (solid line in FIG. 4). 4), and at a position where light is allowed to pass when in the welding posture (FIG. 4).
See dashed line).

In FIG. 6 showing an electric circuit of the gas welding apparatus, a fuse (52), a power switch (31), a power indicator (32), and a limit switch of the aforementioned limit switch are provided between AC power terminals (50) and (51). The contact (53) and the switching circuit (46) (switching means) are connected in series. The switching circuit (46) is connected to the fuel gas pipe (4) and the oxygen pipe when the torch (3) is in the non-welding work position.
The third and fourth solenoid valves (1) of each low-fire line (6) (11) of (9)
4) Open (15) and close the first and second solenoid valves (12) and (13) of each high-fire line (5) (10). When the torch (3) is in the welding position, the fuel gas First and second solenoid valves (12) and (13) of each high-fire line (5) (10) of pipe (4) and oxygen pipe (9)
And the third and fourth pipes of each low heat pipe (6) (11)
The switching circuit (46) for closing the solenoid valves (14) and (15) includes a timer (54),
Photoelectric switch (37), series connection circuit of contact (54a) of timer (54) and pilot igniter (55), first contact (37a) of photoelectric switch (37) and third solenoid valve (14) And a second contact (37b) of the photoelectric switch (37) in series with the solenoid (14a).
And a solenoid (12a) of the first solenoid valve (12) are connected in series. Further, a solenoid (16a) of a fifth solenoid valve (16) is connected in parallel with the pilot igniter (55), and a fourth solenoid valve (1) is connected in parallel with the solenoid (14a) of the third solenoid valve (14).
The solenoid (15a) of the second solenoid valve (13) is connected in parallel with the solenoid (12a) of the first solenoid valve (12).
3a) is connected.

In the gas welding apparatus having the above structure, when starting the gas welding operation, the opening degree of both needle valves (34) and (35) of the torch (3) is adjusted by a high flame suitable for gas welding to the crater (3a).
Each is adjusted so as to be formed. In addition, low-fire pipelines (6) (11) for fuel gas piping (4) and oxygen piping (9)
The opening degrees of the needle valves (17) and (18) are adjusted to be small.

In this state, the power switch (31) is turned on,
When the torch (3) is detached from the arm (33), the arm (33) rises and the contact (53) of the limit switch is closed. At this time,
Since the torch (3) is in the non-welding working position, the photoelectric switch
The first contact (37a) of (37) is open, the second contact (37b) is closed, and the third to fifth solenoid valves (14), (15), (16) are opened and the first and fifth solenoid valves (37) are opened. The second solenoid valves (12) and (13) are closed. Then, the pilot gas igniter (55) ignites the fuel gas blown from the pilot flame burner (7) to form a pilot flame. Therefore,
With the torch (3) in the non-welding work position, bring the crater (3a) close to the pilot flame and ignite the mixture of fuel gas and oxygen blown out from the crater (3a), forming a low flame . Timer
When the time set in (54) elapses, the contact (54a) opens, the fifth solenoid valve (16) closes, and the pilot light goes out.

When the workpiece is conveyed to the worker by the conveyor, the torch (3) is moved to the left (arrow X in FIG. 3).
(See Reference) to bring the welding work posture. Then, the light blocking member (41) swings relatively to the torch (3), and light is allowed to pass between the light emitter (39) and the light receiver (40) of the photoelectric switch (37). The photoelectric switch (37) is switched, the first contact (37a) is closed, and the second contact (37) is closed.
b) opens, the third and fourth solenoid valves (14) and (15) close, and the first and second solenoid valves (12) and (13) open. Therefore, a large amount of fuel gas and oxygen are sent to the torch (3), and a mixture thereof is blown out from the crater (3a) and burned,
A high flame suitable for gas welding is formed, thereby performing gas welding. Normally, the gas welding operation is performed with the torch (3) inclined 20 to 90 degrees to the left from the vertical state shown in FIG.

After gas welding is performed on one workpiece, a torch is used during standby until the next workpiece is sent.
When (3) is returned to the non-welding work position, the light blocking member (41) swings relatively to the torch (3), and the light emitter (39) and the light receiver (40) of the photoelectric switch (37) are moved. And the photoelectric switch (37) is switched, the second contact (37b) is opened and the first contact (37a) is closed, and the first and second solenoid valves (12) (13) are closed. ) Is closed and the third and fourth solenoid valves (14)
(15) opens. Therefore, a small amount of fuel gas and oxygen are sent to the torch (3), and a mixture thereof is blown out from the crater (3a) and burned, thereby forming a low flame. Thus, fuel gas and oxygen during standby can be saved.
In addition, a burn of the worker and a fire during standby can be prevented.

When the gas welding operation for all the objects to be welded is completed, the crater (3a) of the torch (3) is operated in the same manner as in the standby state described above.
Hook the torch (3) on the arm (33) with a low heat. Then, the arm (33) descends, the contact (53) of the limit switch opens, the third and fourth solenoid valves (14) and (15) close, and the fire goes out.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing an overall configuration of a gas welding apparatus according to the present invention.

FIG. 2 is a diagram specifically showing the overall configuration of the gas welding apparatus according to the present invention.

FIG. 3 is a side view of the torch.

FIG. 4 is a partially cutaway enlarged view showing a main part of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a connection diagram showing an electric circuit of the gas welding device according to the present invention.

[Explanation of symbols]

 (3): Torch (4): Fuel gas piping (5): High-fire pipeline (6): Low-fire pipeline (9): Oxygen piping (10): High-fire pipeline (11): Low-fire pipeline (12) (13) (14) (15): Solenoid valve (open / close valve) (17) (18): Needle valve (flow regulating valve) (37): Photoelectric switch (41): Light blocking member (45): Attitude detecting means (46): Switching circuit (switching means)

Claims (2)

[Claims] 1. A high-fire pipe and a low-fire pipe provided in parallel in the fuel gas pipe and the oxygen pipe to the torch, respectively, and a high-fire pipe of the fuel gas pipe and the oxygen pipe. The on-off valve, the on-off valve and the flow rate regulating valve also provided in series in each low-fire pipe, and the torch provided in the torch, and the torch has a predetermined welding operation posture and other non-welding operation postures. Based on the detection result of the posture detecting means for detecting which posture is in which posture, the open / close valve of each low-fire line of the fuel gas pipe and the oxygen pipe when the torch is in the non-welding work posture. Open and close the open / close valve of each high-fire line, and when the torch is in the welding work position, open the open / close valve of each high-fire line of the fuel gas pipe and oxygen pipe and close the open / close valve of each low-fire pipe. With switching means Gas welding equipment. 2. A light source, comprising: a photoelectric switch having a light transmitter and a light receiver arranged opposite to each other; and a light swingably attached to a torch at a portion between the light transmitter and the light receiver of the photoelectric switch. The light blocking member comprises a blocking member, and the light blocking member swings relatively with respect to the torch when the torch moves between the non-welding work position and the welding work position. The gas welding apparatus according to claim 1, wherein the gas welding apparatus moves between a position where light is blocked and a position where light is also allowed to be switched, thereby switching a photoelectric switch.