JPS6146373A - Push-pull wire feeding type welding device - Google Patents

Abstract

PURPOSE:To obtain a titled device that improves movability of transfer side, reduces disconnection accidents and increases operation rate by collecting signal lines to pull motor control and voltage adjusting signal circuit in a cable that transmits welding voltage adjusting signals to a welding power source between the transfer side and non-transfer side. CONSTITUTION:A signal line that transmits a non-transfer side 8 pull motor current detecting circuit signal 20 of a large-size welding device to a transfer side 1 pull motor controlling circuit 11 and a voltage adjusting signal circuit 21 and a welding voltage adjusting high-frequency signal 21 are received in a non-transfer side 8 high frequency receiving circuit 22, and a push motor 18 and a welding voltage output circuit 13 are controlled. The transfer side 1 and non-transfer side 7, 8 are connected only by the signal line and power cable and consequently the movability of the transfer side is improved, disconnection accidents are reduced and the operation rate of welding is heightened.

Description

[Detailed Description of the Invention] Industrial Fields of Application Welding of large structures such as shipbuilding and bridges is carried out using moving welding equipment, whereas welding of small automobile parts is carried out by moving the workpiece. construction method must be adopted. Therefore, welding equipment for large structures is particularly required to be portable and mobile. The present application relates to a push-pull wire feed type welding device as a large structure welding device.

Conventional configuration and its problems As a device for welding large structures, push-pull wire feeding type welding installation, which does not carry wire, has recently been adopted at shipyards around the country as it improves this mobility. It is beginning to be introduced. This push-pull wire feeding type welding device uses two units, a pull feeder and a push feeder, to feed the wire.The heavy wire spool is installed on the push feeder, so the wire must be fed during welding work. Since it is only necessary to carry the pull feeder that is not mounted on it, it is extremely mobile, and is also called a non-wire-carrying feeding device.

However, the push-pull wire feeding type welding apparatus, which is currently attracting attention, still has the following problems.

The problem is that many signal lines go back and forth between the pull feeder and the push feeder, and disconnection accidents sometimes occur due to the frequent movement during welding work.

Figure 1 shows a conventional push-pull wire feeding type welding device, in which a wire inching signal line 2, a pull motor current A3, a current adjustment signal line 4, a voltage adjustment signal line 6, a torch Five to twelve signal lines such as the switch signal line 6 are reciprocated. Welding of large structures requires a lot of movement of the welding equipment, and various forces such as bending and tension are often applied to the signal cable between the pull feeder 1 and the push feeder 7 during work.

Due to repeated use, if any one of these signal lines breaks, the device sometimes becomes inoperable and cannot be welded. In addition, in FIG. 1, 8 is a welding power source, a control device, 9 is a welding torch,
1o is the base material.

That is, in the conventional push-pull wire feeding type welding device, as shown in FIG. 2, a pull motor control circuit 11, a push motor control circuit 12, a welding voltage output control circuit 13, etc. are installed on the welding power source control device 8 side or the push feeder 7 side. A control system is installed to make this the non-moving side (fixed side), and the moving side pull feeder 1 has only simple electrical parts.
For example, the torch switch 14, the inching switch 15,
Only Porium 16.17 was installed. 18 is a push motor, and 19 is a pull motor. Also.

2o is a pull motor current detection circuit.

The reason for this was the concern that if a complicated control system was installed on the moving side, the control system would break if the pull feeder was subjected to impact such as falling.

However, while the conventional system can protect the control system by placing all the control systems on the non-moving side, the number of signal lines between the moving side and the non-moving side increases, and signal line disconnection accidents become a problem.

Purpose of the Invention The present invention provides a push-pull wire feed type welding device, which is a large structure welding device, by reducing the number of signal lines between a pull feeder on a moving side, a welding power source on a non-moving side, and a push feeder side. In addition to reducing signal line disconnection accidents,
The aim is to improve mobility by reducing the weight of signal cables.

Structure of the Invention To achieve this object, the present invention includes a pull motor control circuit that controls the speed of the pull motor on the moving pull feeder side, and a signal for welding voltage adjustment that is transmitted to the welding power source side through a signal line and a power cable. A pull motor current detection circuit for detecting the pull motor current is provided on the non-moving welding power source side or the push feeder side, and a pull motor current detection circuit for detecting the pull motor current detection circuit is provided. A push motor control circuit to control, a welding voltage adjustment signal reception circuit that receives a signal from the welding voltage adjustment signal transmission circuit, and output control of welding voltage according to a voltage adjustment signal from the welding voltage adjustment signal reception circuit. The welding voltage output control circuit is equipped with a welding voltage output control circuit.

Description of examples FIG. 3 shows how to actually implement the present invention.

As shown in Figure 4, the pull motor control circuit 1 is connected to the pull feeder 1.
1, an inching switch 15, and a current adjustment volume 16, the inching operation and current adjustment operation can be performed on the pull feeder side as before, and the signal line does not need to be reciprocated with the welding power source/control device side. The number of signal lines can be reduced. Note that the pull motor control circuit 19 at this time controls the pull motor 19 to rotate at a constant speed independently, and if it is separated from the control with the push motor 18, the pull motor control circuit 19 detects the rotation of the push motor 18 and controls the pull motor 19. Since there is no need to control the rotation of the motor, there is no need to increase the number of signal lines.

On the other hand, a pull motor current detection circuit 2o is provided on the non-moving side of the welding power source/control device to control the rotation of the push motor 18 in accordance with the pull motor current waveform. At this time, as shown in FIG. 5, the push motor 18 is controlled by a foot torque control method in which the push motor 18 is operated dependently to follow the rotational speed of the pull motor 19. Note that the pull motor current detection circuit 20 detects the current flowing in the signal line because the current flowing from the control output is the motor current and the high frequency transmission circuit 21 for adjusting the welding voltage consumes a large number of currents. This is used as the pull motor current detection circuit 20.

As shown in Fig. 4, the high frequency transmission circuit 21 for adjusting the welding voltage generates a high frequency signal matching the welding voltage command value on the pull feeder 1 side, and is a closed loop circuit that passes through the signal line and the welding power cable. This signal is received by the high frequency receiving circuit 22 in the welding power source/control device on the non-moving side, and the welding voltage output corresponding to this signal is determined.

FIG. 6 shows the details of this welding voltage output control circuit, which is a v-F conversion circuit that generates a constant frequency according to the rotation angle of the voltage adjustment volume 17 provided on the pull feeder 1 on the moving side. 23 and the signals from the carrier wave oscillation circuit 24 are combined by the modulation circuit 26, and a high frequency signal as shown in FIG. 7 is transmitted through the closed loop of the signal set and the power cable.

The transmitter/receiver section includes capacitors 26, 27. High frequency coils 28 and 29 are coupled to enable efficient transmission and reception of this high frequency signal. A demodulation circuit 30 that demodulates the carrier wave signal and a y-v conversion circuit 31 that converts the frequency into a voltage value are provided in the welding power source-control device side receiving section to generate a voltage value corresponding to the frequency and to correspond to this voltage value. The thyristor firing phase is determined by the thyristor firing phase control circuit 32.

At this time, if the same signal line as the control output line for rotation of the pull motor 19 is used and the DC current and high frequency signal are separated by a capacitor, it is possible to avoid increasing the number of signal lines.

In order to make the present application even more effective, it is also effective to embed and fix the various control circuits built into the moving pull feeder with resin, etc., to prevent damage to the control system due to dropping of the pull feeder or impact. .

Furthermore, as another embodiment of the present invention, some control parts installed on the moving pull feeder side, a torch switch, an inching switch, a current adjustment volume, a voltage adjustment volume, etc., are separated and integrated into one remote control box. The present invention also includes making it separable from the pull feeder so that it can be used near the welding torch, which is also on the moving side.

In addition, the pull motor current detection circuit, push motor control circuit, high frequency receiving circuit, etc. installed on the welding power source side on the non-moving side are separated from the welding power source and control device and installed in one control box. The present invention also includes installation at a fixed location on the side.

It is also an embodiment of the present invention to digitally control a pulse signal based on a carrier wave of a welding voltage adjustment signal by converting it into a pulse code.

Effects of the Invention As described above, according to the present invention, a part of the control circuit is also installed in the pull feeder on the moving side and the number of signal lines on the moving side and non-moving side is reduced, thereby making it easier to weld large structures. The mobility of the pull feeder is improved, the number of signal line breakage accidents is reduced, and the operating rate of the welding equipment can be improved.

In addition, by reducing the number of signal lines, the number of contact points at the connection outlet is reduced, reducing contact failures, and
Connecting outlets are cheaper.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a conventional push-pull wire feed welding device, Fig. 2 is a block circuit diagram of the same device, and Fig. 3 is a configuration diagram of a push-pull wire feed welding device of the present invention. , Fig. 4 is a block circuit diagram of the device, Fig. 5 is a characteristic diagram for explaining the push-pull/feed type motor control system, Fig. 6 is a block circuit diagram showing the high frequency transmission and reception circuits, FIG. 7 is a signal waveform diagram in the block circuit of FIG. 6. 1...Pull feeder, 7...Push feeder, 8...Welding power source/control device, 9...
...Welding torch, 11...Pull motor control circuit, 12...Push motor control circuit, 13
...Welding voltage output control circuit, 18...
Push motor, 19...Pull motor, 20.
...Pull motor current detection circuit, 21...
High frequency transmitting circuit, 22... High frequency receiving circuit, 2
3... V-F conversion circuit, 24... Carrier wave oscillation circuit, 25... Modulation circuit, 26.27.
... Capacitor, 28°29 ... High frequency coil, 30 ... Demodulation circuit, 31 ...
F-V conversion circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 4 Figure 5 Figure 6 Figure 7

Claims (3)

[Claims] (1) The moving pull feeder is equipped with a pull motor control circuit that controls the speed of the pull motor and a welding voltage adjustment signal transmission circuit that transmits welding voltage adjustment signals to the welding power source through the signal line and power cable. A pull motor current detection circuit for detecting the pull motor current, a push motor control circuit for controlling the torque of the push motor according to the detected current of the pull motor current detection circuit, and the welding voltage adjustment on the welding power source side or the push feeder side on the moving side. A push-pull device comprising: a welding voltage adjustment signal receiving circuit that receives a signal from a welding voltage adjustment signal transmitting circuit; and a welding voltage output control circuit that output-controls a welding voltage according to a voltage adjustment signal of the welding voltage adjustment signal receiving circuit.・Wire feed type welding device. (2) The signal transmission circuit for adjusting the welding voltage includes a variable resistor and a V
The push-pull wire feeding type welding device according to claim 1, comprising: -F conversion circuit, carrier wave oscillation circuit, modulation circuit, and high frequency circuit components. (3) The signal receiving circuit for welding voltage adjustment includes a high frequency coil,
The push-pull wire feed type welding device according to claim 1, comprising a demodulation circuit and an F-V conversion circuit.