JPH09150268A - Arc welding equipment - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To improve maintainability and operability, and to keep the rotation speed of a wire feeding motor constant regardless of the length of an extension cable. A welding power source unit 13 and a wire feeding device unit 12
In the arc welding apparatus using the, the wire feeding motor 2, the operation box 3, and the control circuit are housed in a case made of metal or resin to form a unit, and each unit is provided with a mechanism that can be easily separated and attached. The feeding motor 2 and the control circuit 1 and the operation box 3 and the control circuit 1 are connected by the connectors 4 and 5, and the wire feeding device section 12 connects the negative side of the wire feeding motor 2 and the negative side of the control circuit 1. Welding power supply unit 13 via the extension cable 14
The influence of the extension cable can be eliminated by connecting to the negative side of the DC power source 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION Generally, in an arc welding apparatus, a control circuit for controlling welding output is provided in a welding power source section, an operation box for setting welding conditions is provided in a wire feeding apparatus, and a welding power source section and a wire feeding section are provided. It is used by connecting an extension cable between the devices.

In recent years, in the industry, in order to reduce the burden of worker's movement work, an operation box is attached to a wire feeding device section and a signal line connected to the operation box and a signal line connected to a wire feeding motor are installed. The number of arc welding machines that are commonly used and have a reduced number of extension cables is increasing. (See Welding Technology 1995 VOL43).

The present invention relates to an arc welding apparatus in which the number of such extension cables is reduced to improve maneuverability and reduce operator's burden.

[0004]

2. Description of the Related Art FIG. 3 is a block diagram of a conventional arc welding apparatus, and FIG. 4 is an explanatory view of the wire feeding apparatus.

3 and 4, 8 is a control circuit for controlling the number of revolutions of the wire feeding motor 11, 11 is a wire feeding motor for feeding the welding wire, and 10 is a welding condition setting section for setting welding conditions. A certain operation box 9 is a DC power supply for supplying a voltage to the control circuit 8 and the wire feeding motor 11.

Operation box 10 and wire feeding motor 11
Is arranged in the wire feeding device section 12, and the control circuit 8 and the DC power source 9 are arranged in the welding power source section 13. Reference numeral 14 is an extension cable that connects the welding power source unit 13 and the wire feeding device unit 12.

As shown in FIG. 3, in the conventional arc welding apparatus, the welding power source section 13 is provided with a control circuit 8 for controlling the number of rotations of the wire feeding motor 11.

The wire feeding motor 11 and the operation box of the wire feeding device section 12 are mechanically fixed so that the wire feeding motor 11 and the operation box 10 cannot be easily separated from each other. Operation box 10
The connection of the cable cannot be easily cut off by soldering or crimping terminals.

The negative side of the wire feeding motor of the wire feeding unit 12 is connected to the negative side of the DC power source 9 of the welding power source 13 and the negative side of the control circuit 8 via the extension cable 14. .

[0010]

However, the conventional arc welding apparatus has the following drawbacks. (1) The welding power source unit 13 is provided with the DC power source 9 and the control circuit 8 for controlling the number of rotations of the wire feeding motor 11, the wire feeding motor 11 is attached to the wire feeding device unit 12, and the wire feeding motor 11 Although the rotation speed of the wire feeding motor 11 is controlled to be constant regardless of the size of the load, when the extension cable 14 is used, the control circuit 8 and the wire feeding motor 11 are separated from each other and the motor rotation speed is increased. Cannot be controlled accurately.

Since the negative side of the wire feeding motor 11 of the wire feeding device section 12 is connected to the negative side of the control circuit 8 of the welding power source section 13 via the extension cable 14, the length of the extension cable 14 is increased. Becomes longer, the motor 1
The rotation speed of 1 decreases. (2) The wire feeding motor 11 and the operation box 10 are not separable from each other. When the operation box 10 breaks down, it is extremely difficult to replace the failed operation box 10 and the normal operation box 10 together. Further, in order to set the welding output condition, the welding operator must go to the operation box 10 located at the wire feeding device unit 12, and the welding box 10 mounted on the wire feeding device unit 12 is welded. It cannot be easily extended to the operator's hand.

The present invention solves the above-mentioned conventional problems, is not affected by the length of the extension cable and its change, and
It is an object of the present invention to prevent a failure of each part and to provide an arc welding device that can be easily replaced in the unlikely event of a failure.

[0013]

In order to achieve the above object, an arc welding apparatus of the present invention comprises a wire feeding device portion for supplying a wire to a welding portion, and a welding power source portion for supplying a voltage to the welding portion. And a welding condition setting unit for setting welding conditions in the wire feeding device unit, a wire feeding motor, and a control circuit for controlling the number of revolutions of the wire feeding motor, and the control circuit from the welding power source unit. And a voltage to the wire feeding motor.

Further, the welding condition setting unit, the wire feeding motor and the control circuit are unitized, and each unit is detachably provided.

Further, the unit is formed by housing in a closed case.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION With the above structure, the wire feeding motor and the control circuit can be connected in the wire feeding device section, and the length of the extension cable between the wire feeding apparatus section and the welding power source section can be increased. The wire feeding motor can be accurately controlled regardless of the change in the height.

Further, the welding condition setting unit, the wire feeding motor, and the control circuit are unitized, and each unit is detachably provided, so that even if each unit fails, it can be easily replaced. .

Further, by forming the unit by housing it in a closed case, it is possible to prevent water and dust from entering the inside of the unit and prevent failure of each unit.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an arc welding apparatus according to an embodiment of the present invention, and FIG. 2 is an explanatory view of the wire feeding apparatus. This will be described below with reference to the drawings.

In FIGS. 1 and 2, 1 is a control circuit for controlling the number of rotations of the wire feeding motor 2, 2 is a wire feeding motor for feeding a welding wire, 3 is an operation box for setting a welding output, Reference numeral 4 is a first connector that connects the wire feeding motor 2 and the control circuit 1, and 5 is a second connector that connects the operation box 3 and the control circuit 1. These are arranged in the wire feeding device section 12. Further, 6 is a DC power source and is arranged in the welding power source unit 14.

As shown in FIG. 2, the wire feeding motor 2, the operation box 3, and the control circuit 1 of the wire feeding device section 12 are united by hermetically housing in a case made of metal or resin. A detachment mechanism 7 such as a hook metal fitting or a bolt is attached to each unit, and the feed motor 2 and the control circuit 1 and the operation box 3 and the control circuit 1 are respectively provided with a second connector 5 and a second connector 5 so that they can be cut off. It is connected by the first connector 4.

Numeral 14 is an extension cable for connecting the welding power source section 13 and the wire feeding apparatus section 12, and the wire feeding apparatus section 12 has a minus side of the wire feeding motor 2 and a minus side of the control circuit 8. And the connection point and the minus side of the DC power source 6 of the welding power source section 13 with the extension cable 1
It is connected via 4.

Further, the wire feeding device section 12 is frequently moved in the welding work place and is easily subject to drop or impact. Further, it may be used outdoors, and water may enter the inside of the control circuit 1. Therefore, the control circuit 1
In order to prevent this mechanical damage, it is housed in a case made of sturdy metal or resin, and is sealed so that water does not enter. Furthermore, the attachment / detachment mechanism 7 is attached to the metal case containing the control circuit 1,
Since the control circuit 1 is connected to other units using the connectors 4 and 5, even if the control circuit 1 fails, it can be easily removed and repaired.

As described above, in the embodiment, the DC power source 6 is provided in the welding power source unit 13, and the control circuit 1 for controlling the rotation speed of the wire feeding motor 2 and the wire feeding motor 2 are both wire feeding device units. Since it is attached to No. 12, there is an advantage that the motor rotation speed can be accurately controlled without being affected by the extension cable 14.

By connecting the negative side of the wire feeding motor 2 and the negative side of the control circuit 1 in the wire feeding device section 12, the negative sides of the wire feeding motor 2 and the control circuit 1 are at the same place. Because it is connected with
There is an advantage that the rotation speed of the wire feeding motor 2 is not affected by the resistance drop of the impedance of the extension cable 14.

Further, the wire feeding motor 2, the operation box 3 and the control circuit 1 provided in the wire feeding device section 12 are provided.
Is divided into units housed in a case made of metal or resin, a detaching mechanism 7 such as a hooking metal or a bolt is attached, and the wire feeding motor 2 and the control circuit 1 and the operation box 3 and the control circuit 8 are connected to each other. Since units 4 and 5 are used for connection, each unit can be easily attached and detached.

Therefore, when any one of the units fails, not only is the defective unit taken out and repaired or replaced with a new unit, but also the operation box 3 can be easily detached from other units. Therefore, the welding operator can extend the operation box 3 to the hand of the welding operator and set the welding output condition.

As described above, according to the present embodiment, there are excellent effects such that the constant rotation speed control of the motor rotation speed can be accurately performed, workability is good, maintenance and inspection are excellent, and repair is easy.

[0030]

As is apparent from the above description, according to the arc welding apparatus of the present invention, the wire feeding motor and the control circuit can be connected in the wire feeding device section, and the wire feeding device can be connected. The wire feeding motor can be accurately controlled regardless of the change in the length of the extension cable between the welding section and the welding power source section.

Further, the welding condition setting unit, the wire feeding motor, and the control circuit are unitized, and each unit is detachably provided, so that each unit can be easily replaced even if it breaks down. .

Further, by forming the unit by housing it in a closed case, it is possible to prevent water and dust from entering the inside of the unit and prevent malfunction of each unit.

[Brief description of the drawings]

FIG. 1 is a block diagram of an arc welding device according to an embodiment of the present invention.

FIG. 2 is an external view of the wire feeding device.

FIG. 3 is a block diagram of a conventional arc welding apparatus.

FIG. 4 is an explanatory view of the wire feeding device.

[Explanation of symbols]

1 Control Circuit 2 Wire Feed Motor 3 Operation Box 4 First Connector Connecting Feed Motor Section and Control Circuit Section 5 Second Connector 6 Connecting Operation Box Section and Control Circuit Section 6 DC Power Supply 7 Attachment / Detachment Mechanism 8 Control Circuit 9 DC power source 10 Operation box 11 Wire feeding motor 12 Wire feeding device section 13 Welding power source section 14 Extension cable

Claims (4)

[Claims] 1. A welding condition setting unit that includes a wire feeding device unit that supplies a wire to a welding portion and a welding power supply unit that supplies a voltage to the welding portion, and sets welding conditions in the wire feeding device unit. An arc welding apparatus comprising: a wire feeding motor; and a control circuit for controlling the number of rotations of the wire feeding motor, and supplying a voltage from the welding power source to the control circuit and the wire feeding motor. 2. The arc welding device according to claim 1, wherein the minus side of the control circuit and the minus side of the wire feeding motor are connected by a wire feeding device section. 3. The arc welding apparatus according to claim 1, wherein the welding condition setting unit, the wire feeding motor, and the control circuit are unitized, and each unit is detachably provided. 4. The arc welding device according to claim 3, wherein the unit is formed by housing in a closed case.