JPS5841021Y2 - Welding start prohibition device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a welding start inhibiting device in an automatic welding device.

In an automatic welding device that performs CO2 gas welding, TIG welding, etc., a welding wire wound into a coil around a spool is automatically fed as welding progresses.

Conventionally, when automatically welding, if you start work without checking the remaining amount of wire wound on the spool, welding may be stopped midway through work if the amount of wire required for one work is insufficient. A situation arises where the process is interrupted.

In this case, in order to restart welding, in addition to replacing the wire coil, gouging or grinding is necessary to reshape the crater that has occurred where welding was interrupted and to stabilize the penetration when restarting welding. In addition, when restarting welding, the automatic welding equipment must be manually fine-tuned to ensure stable penetration and a good appearance of the seam bead. This requires manual labor.

Therefore, in order to facilitate the work, it is necessary to detect the remaining amount of wire before starting the work and prevent interruption of welding.

The present invention was developed in view of the above circumstances, and its purpose is to detect the remaining amount of wire and, if the remaining amount of wire is insufficient for one work process, turn on the work start switch. It is an object of the present invention to provide a welding start inhibiting device that can eliminate the above-mentioned problems by preventing welding from even starting.

Hereinafter, an embodiment of the welding start inhibiting device according to the present invention will be described based on the drawings.

To explain the means for detecting the remaining amount of wire, as shown in FIGS. 1 and 2, a welding wire 2 is wound around a spool 1 in a coil shape, and the spool 1 rotates around a rotating shaft 3. Wire 2 is welded (not shown)
sent to.

4 is a detection arm for detecting the remaining amount of wire, and this detection arm 4
is a member 6 via a pin 5 at one end 4a thereof.
The other end 4b contacts the wire 2 wound around the spool 1 from above.

Further, a guide pin 7 is fixed at approximately the center portion 4c of the detection arm 4, and this guide pin 7 is slidably fitted into a long arc-shaped guide hole 8 provided in the member 6.
This guide pin 7 guides the four rotational movements of the detection arm 4.

The upper end of a spring 9 is fixed near the center portion 4c of the detection arm 4, and the lower end of the spring 9 is fixed to the member 6, and the tension of the spring 9 causes the detection arm 4 to
is pulled counterclockwise, and its end 4b lightly presses the surface of the coil of wire 2 wound around spool 1.

Reference numeral 10 denotes a limit switch, and this limit switch 10 is fixed to the member 6 so that the upper end of the operating rod 11 comes into contact with the lower surface 4d of the substantially central portion 4c of the detection arm 4.

As the welding work progresses, the spool 1 rotates as the wire 2 is fed, and the end 4b of the detection arm 4 is connected to the spool 1.
The surface of the wire 2 wound on the surface of the wire 2 is slid on.

As the wire 2 is consumed, the thickness of the winding layer of the wire coil wound on the spool 1 decreases, so that its end 4
The detection arm 4, whose b is in contact with the surface of the wire coil, is rotated counterclockwise about the pin 5 as a fulcrum while being pulled by the spring 9 and guided by the pin 7 sliding through the guide hole 8. .

The amount of wire 2 wound around the spool 1 required for one welding operation is, for example, as shown in FIG. When the amount of wire 2 is half wound, the wire 2 is consumed as the welding progresses and the remaining amount of wire 2 reaches the above amount, and when the detection arm 4 comes into contact with the surface of the core 1a of the spool 1. , the detection arm 4 so that the limit switch 10 emits a signal.
If the mounting positions of the limit switch 10 and the limit switch 10 are determined, the wire 2 will be consumed as one work progresses.
When the remaining amount of wire 2 reaches the above-mentioned amount, the limit switch 10 issues a signal.

However, while the work is in progress, the remaining amount of wire reaches the above amount,
Even if a signal is issued from the limit switch 10, the work in progress continues until the process of the work is completed,
Prohibits the start of the next process after work is completed.

The amount of wire required for one welding process varies depending on the object to be welded.

Therefore, the mounting of the limit switch 10 described above allows the position to be moved in the vertical direction, or the mounting of the limit switch 10 fixes the position, and when the set time of the timer elapses from the operation of the limit switch 10. By outputting a signal, the timing of detecting insufficient amount of wire remaining can be adjusted depending on the workpiece to be welded.

Note that instead of the limit switch 10 in the above embodiment,
By using a differential transformer, the remaining amount of wire can be continuously detected and displayed as the winding thickness of the wire coil decreases, and in this case, the timing of replacing the wire coil can be determined. You can know in advance.

In the case of this differential transformer, by making the reference setting value for comparison with the output voltage variable, the timing of detecting a shortage of wire remaining amount can be adjusted depending on the workpiece to be welded.

To explain still another embodiment of the wire remaining amount detecting means, as shown in FIG. , and the spool 1 is fixed to the support arm 12
It is rotatably supported on the top.

The other end 12b of the support arm 12 is rotatably supported by a member (not shown) by a pin 13.

A rod-shaped member 12 extends downward from approximately the center of the support arm 12.
C is continuous, the lower end of this rod-like member 12C is supported by a strain gauge 14, this strain gauge 14 is supported from below by a rod-like member 15, and the lower end 15a of this rod-like member 15 is connected to a pin 16. It is supported by a fixing member (not shown) through it.

Note that a lead wire 17 for transmitting a measurement signal is connected to the strain gauge 14.

In this configuration, the weight of the wire coil of the spool 1 can be continuously detected by the strain gauge 14, and this can be displayed.

An example of a control circuit for prohibiting the start of the next work when the remaining amount of wire is insufficient for one work process will be explained.As shown in FIG. A measurement signal of the wire coil is inputted to a strain amplifier 19 via a bridge head 18, and an output signal of this strain amplifier 19 is inputted to a comparator 20.

The comparator 20 is further inputted with a setting signal from a one-time welding weight setter 21, and when welding progresses and the measured value of the wire coil becomes smaller than the one-time welding weight setting value, a signal is output from the comparator 20. Output relay 2
Turn on 2.

By changing the set value of the welding batch weight setter 21, the timing of detecting insufficient amount of wire can be adjusted depending on the workpiece to be welded.

When the output relay 22 is turned on, its B contact 23 opens in the circuit shown in FIG. In addition, welding relay 25
Since the welding relay 25 is self-held by the A contact 26, welding is not stopped.

When the welding process is completed and the welding stop push button 27 is pressed, the welding relay 25 is turned off and welding is stopped.

Next, press the welding start button 24 to start the next welding operation.
Even if is pressed, the output relay 22 is on and the B contact 23 is open, so the welding relay 25 does not turn on and welding does not start.

As explained above, in the welding start prohibition device according to the present invention, the remaining amount of the wire coil wound around the spool can be detected by detecting the position change due to the rotation of the detection arm or by continuously detecting the weight change. This is detected by using a means, and if the remaining amount of wire is insufficient for one work process at the time of starting welding work, welding will not start even if the work start switch is turned on.
Work is not interrupted due to insufficient wire remaining.
Therefore, complicated manual work such as gouging, grinding, or fine adjustment of the device is not required, and the work can be carried out smoothly.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the wire remaining amount detection means in the present invention, FIG. 2 is a front view of FIG. 1, and FIG.
FIG. 4 is a front view showing another embodiment of the wire remaining amount detection means of the present invention, FIG. 5 is a block diagram showing one embodiment of the present invention, and FIG. FIG. 2 is a circuit diagram showing an example. DESCRIPTION OF SYMBOLS 1... Spool, 2... Welding wire, 4... Detection arm, 10... Limit switch, 12... Support arm, 14... Strain gauge, 19... Strain amplifier, 20... ...Comparator, 22...Output relay, 23...B contact, 24...Welding start push button, 25...Welding relay 26...A contact, 27...
・Welding stop push button.

Claims (1)

[Scope of utility model registration request] A lever that rotates according to the amount of welding wire remaining; a detection unit that generates a signal that detects that the amount of wire that can be welded at one time is insufficient when the lever is rotated by a predetermined angle or more; The workpiece is equipped with a welding start prohibition circuit that prohibits the start of welding when the signal is generated from the welding part, and outputs a signal to detect when the amount of wire necessary for one welding is insufficient. A welding start inhibiting device, characterized in that the detecting section or the welding start inhibiting device includes an adjusting means for changing the welding start inhibiting device according to the change in the welding start inhibiting device.