JPS6083780A - Remote control device for welding machine - Google Patents

Abstract

PURPOSE:To make a device simple and to prevent malfunction and trouble by providing a transmission part which oscillates an electric signal of a high frequency to a holder of a welding electrode and a reception part to a control part and enabling control of a power source only with the transmission cable for welding power. CONSTITUTION:A titled device consists of a welding rod 1, a transmission cable 3 which is connected thereto and is used as a signal transmission line as well, a power source part 2, a control part 7 which controls variable quantity, a transmission part 6 and a reception part 9. Said part 6 is attached to the holder of the rod 1 and the electric signal for control is transmitted from said part to the transmission line. The above-described reception part 9 is provided in combination with the control part 7 and detects the electric signal sent from the transmission line. The power source of an arc welding machine is controlled only via one transmission cable 3 by the above-mentioned device, by which malfunction and trouble are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding machine remote control device for remotely controlling the power output of an arc welding machine, and particularly for welding where the work place may be several tens of meters away from the installation location of the power supply device. The present invention relates to a welding machine remote control device suitable for the welding machine.

For example, at welding sites that handle large structures such as those in the shipbuilding industry, the work area is far from the installation location of the power supply, and movement is rapid, and the shape, material, and thickness of the base material to be welded is variable. There are many different types and often require adjustment of the working current. However, if a worker has to go to the location where the power supply device is installed and operate it each time, the work efficiency will decrease and the labor burden will be too great.

Therefore, there is a need for a remote control device that can operate the power supply even at a remote work location, and conventionally a system as shown in FIG. 1 has been used. In the prison, the welding rod 1 and the power supply device 2 are approximately several tens of meters apart and are connected by a power transmission cable 3.

Welding power is also supplied by a power transmission cable 3.

The base material 4 is also supplied by a grounding cape/I15.

The operation box 6 for remotely controlling the welding power and the control device 7 are connected by a separate remote control cape A/8. For such devices.

When moving from one work place to another, dragging the remote control cable 8 in addition to the power transmission cable 3 and carrying the welding rod 1 and operation box 6 is extremely cumbersome and can impede the safety of the work site. Recently, wireless remote control devices have been put into practical use, but if they use radio waves, powerful high-frequency waves are often superimposed at the welding site to maintain arc stability. Noise generated by high frequencies can cause remote control devices to malfunction or become uncontrollable.Furthermore, wireless remote controllers that use ultrasonic waves or infrared rays may be unable to send or receive data if their straight line movement is obstructed by an obstacle. Sometimes it becomes.

The purpose of the present invention is to solve the above-mentioned problems and to make it possible to remotely control the power supply device from confectionery factory B, while reducing the number of equipment and wiring that burden the workers. An object of the present invention is to provide a welding machine remote control device with significantly reduced performance.

In order to achieve the above-mentioned object, the present invention includes a transmitter that carries a high frequency control electric signal and sends it out to a single transmission line. The present invention is characterized in that a receiving section for detecting signals from a transmission line is attached to the control section, and the power supply device can be remotely controlled from a work place by using only a welding power transmission cable as a single transmission line.

The present invention will be explained in detail below with reference to the drawings.

FIG. 2 is a schematic configuration diagram showing an example of a welding machine remote control device embodying the present invention. In the figure, the bath welding machine is composed of a welding rod 1, a connecting part 2, and a power transmission cable 3, and a base material 4 is also connected by a grounding cable 5. A transmitting section 6 of the remote control device is attached to or connected to the holder of the welder wi1, and a control section 7 and a receiver 1 section 9 are attached to the power source section 2. FIG. 3 is a diagram showing an example of a transmitter attached to a welding rod holder, and the transmitter 6 is attached to the cylindrical insulator 1al of the holder 1a.

A plurality of push buttons 6a, 6b, etc. protruding from the outside thereof.
・It is operated by pressing with your finger.

If the electrical signal of the present invention is simple, it can be put to practical use in an analog system (as described later), but in order to perform more complicated control than that, the transmitting section must be equipped with an encoder.
A system in which the control section includes a microprocessor and uses digital codes is more suitable. Therefore, first, an example of the digital method will be explained.

FIG. 4 is a circuit diagram showing an example of a transmitting section implementing the present invention. In the figure, the transmitter includes a code generating circuit 62, which functions as a selection switch 61% encoder. It is composed of a modulation circuit 63 and a battery 64. In order to reduce the weight, the battery 64 is a small dry battery, and the code generation circuit 62 uses a known low voltage C-MO8 integrated circuit. Selection switch 6
1 is a key matrix push button switch.

The code generation circuit 62 is set to 8 according to the selected X-Y address.
A modulation circuit 63 comprising two driver transistors 63a and 63b transmits a bit signal, which is repeated twice for reasons explained below, to carry it to a higher frequency, and is transmitted from the output terminal A to the power transmission cable 3.

The electrical signal sent through this power transmission cable becomes a weak signal of several tens of millivolts to several hundred millivolts on the receiving side, but by transmitting it at a high frequency higher than the welding frequency, it is possible to use filters, amplifier circuits, etc. as described below. This makes it easier to discriminate against noise.

Figure M5 is a circuit diagram showing an example of the receiving section 9 that performs one-shot +H. In the figure, the receiving section 9 is.

Filter 91, amplification circuit 92. It is composed of a waveform shaping circuit 93. FIG. 6 is a waveform diagram showing an example of the No. 41 waveform at each point B and FK of the receiver section of the receiver section [tl) to [F]. The electrical signal detected from the transmission line, that is, the power transmission cable 3 at the input terminal B of the receiving section 90 is % (Figure 6 CB)
As shown in FIG. 6, the waveform is such that the signal is floating on the low-frequency noise picked up by the power transmission cable 3 during transmission.
Create a stable waveform as shown in . This signal is amplified by an amplification circuit 92 to form a clear waveform as shown in FIG. 6 (D).

This waveform is still a combination of a carrier wave and a signal wave, so further.

The signal is input to the waveform shaping circuit 93. The waveform shaping circuit 93 includes a comparator 93a, a capacitor 93b, and a Schmitt trigger 9jc.The input signal is first cut within the set voltage value range by the comparator 93a, and the waveform becomes the waveform shown in FIG. 6 [E]. Then, the capacitor 93b removes the transport portion, that is, fills the gap between the pulses, and finally the minute pulsating flow portion is shaped through the Schmitt trigger 93C to form a complete rectangular wave as shown in No. 61iW[:F]. is output from the output terminal F to the control section 7 as a binary signal.

FIGS. 7A, 7B, and 7C are schematic circuit diagrams showing an example of the control section 7 according to the present invention. In the figure, the control unit 7 includes a signal processing circuit 71 equipped with a microprocessor 70, and an excitation power adjustment relay L11 LS l LS
. . . The excitation control circuit 72 includes: The first stage of the processing by the microprocessor 70 is a procedure for preventing malfunction, and the second stage: processing based on the signal content (
Arrangements have been made for control orders. First, the binary signal inputted from the connection terminal F of the receiving section 9 is temporarily stored in a data register for one 8-bit frame, and then compared with the subsequently inputted 8-bit binary signal. As already explained in FIG. 4, the transmitter transmits the same 8-bit signal twice, so as shown in FIG. 7), the first signal S, the second signal S, If the binary configurations of the first signal SI and the second signals S and l are the same, the accumulated data is released as a correct control signal, and if the binary configurations of the first signal SI and the second signals S and l are different, it is determined that noise has been mixed in and malfunctions are prevented. Therefore, neither the first signal nor the second signal is adopted. Now, if the signal is determined to be correct, the binary configuration of the digital signal (for example, 10101
101) is used as the address of the control instruction, and the control instruction stored at the corresponding address is used as the address of the corresponding input/output port.
) 70a, respectively. The content of the control commands can be complex and diverse, including turning on and off each relay, and even total control in the power supply section is possible, but here we will control the output of the welding synchronous generator by manipulating the excitation current. Control will be explained as an example. As shown in FIG. 7(b), by the control command of the microprocessor 70.

When a signal is issued from the input/output port e, the signal drives the first transistor Tr, lights up the first display lamp 'P1, and turns on the first relay L. This relay L, , L, ,L.

. . . also closes the contacts of relays LI + L2 + LS of the generator excitation circuit shown in Fig. 7 (c), by selecting one of them and turning it on.

The desired welding power can be obtained by changing the excitation flow. Note that this excitation control circuit can be used by switching the changeover switch SW'? when an operator is nearby and wants to manually perform fine M operation. :
It can also be switched and operated by a variable resistor vR.

In this way, if the control unit is equipped with a microprocessor and digital signals are used, even high-level noise that cannot be eliminated due to the working environment can be transmitted all at once and then divided into sections when binarized. It is also possible to check the prevention of malfunctions, and on the other hand, depending on the number of focus points, it is possible to secure a large number of signals and perform a wide variety of complex controls, which is extremely convenient.

However, the present invention does not necessarily require a microprocessor and does not assume digital signals. Simply turn the power on/off or instruct the increase/decrease of current'1-
If this is the case, by fixing it to one instruction and one action,
It can also be implemented satisfactorily with analog signals. Next, an example thereof will be explained with reference to the drawings.

The eighth figure is a schematic configuration diagram showing an example of a welding machine remote control device that performs one shot 8A using an analog signal. In the figure, the remote control device is a transmitter 6. Transmission line (power transmission cable) 3. It is composed of a receiving section 9. transmission line 3
is single.

Of course, power transmission cables are used. The transmitter 6 includes two signal frequency oscillation circuits 66a and 66b, and a push button switch S W a or SW connected to each of them.
By! ? By turning on the button, signals of different frequencies are oscillated. For example, the first pushbutton switch 8Wa
When is pressed, the first signal frequency oscillation circuit 66a is driven and oscillates the signal wave shown in FIG. When the switch SWb is pressed, the second signal frequency oscillation circuit 66
b is driven to oscillate a signal wave shown at 9th line (:B). The frequency of the second signal is different from that of the first signal, and this is used as a command to "reduce welding current". When any of the above signals is oscillated, the signal is input to the mixer circuit 67 and superimposed on the high frequency wave oscillated from the carrier wave oscillation circuit 68. When the first signal is carried, the waveform is shown in FIG. 9 [C]. This signal is further amplified by the high frequency amplification circuit 69, converted into a waveform as shown in 911iQ [:D), and sent to the transmission input 3 from the output terminal of the transmitter 6. The receiving unit 9 includes a re-biopsy wave circuit 96. Tuned amplifiers 97a and 97b,) transistors 98a and 98b, and the re-biopsy wave circuit 96 is configured by an LC circuit tuned to the carrier high frequency.
This is one of the two tuned amplifiers that detects the signal wave shown in Figure (D) and demodulates the signal wave shown in Figure 9 (CB), excluding the carrier wave.

The first tuned amplifier 97a is an amplifier equipped with an LC circuit tuned to the frequency of the signal wave shown in FIG.
The anzu 97b is an amplifier equipped with an LC circuit tuned to the frequency of the signal wave shown in FIG. 9CB). here,
As in the above example, if the waveform input from the p;q detection circuit 96 is shown in FIG. 9(E), this is the same frequency as FIG. 9(A), so the first Tuning amplifier 9
7H amplifies this, controls the next stage transistor 98b, and operates the relay La. What if the switch pressed at the scene was SWb?

The waveform appearing in the re-biopsy wave circuit 96 is the same as that in the ninth prisoner (B), and is amplified by the second tuned amplifier 97b, and is amplified by the second tuned amplifier 97b.
Activate. Relays La and Lb are contacts that rotate the DC motor forward or reverse depending on which one is turned on, and the DC motor controls the excitation adjustment resistor of the welding current, and the relay La In response to the "increase welding current" command, the relay Lb is wired to the side corresponding to the "decrease welding current" command. As described above, according to the present invention, if the command is simple, the command can be sufficiently transmitted using a single transmission line even in an analog system, and the power supply device of the welding machine can be remotely controlled.

As explained above, if the remote control device according to the present invention is implemented in a welding machine, an operator can go to a far away power supply location when he or she wants to control the welding current based on the thickness of the base material, etc. You can control the power supply by simply pressing the push button on the transmitter attached to the welding rod holder.Moreover, there is no need to add additional cables, just one power transmission cable. It does not get in the way when used.The present invention has the following advantages in that it facilitates digital control.
Although it makes a great contribution to noise reduction and total control, it can also be applied to analog systems, and wired control has a great effect on noise prevention.

In other words, the present invention minimizes equipment and wiring while
To provide a welding machine remote control operation that allows a power supply device to be remotely operated from a remote work place and significantly reduces the possibility of malfunctions and troubles.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional welding machine remote control device, Fig. 2 is a schematic configuration diagram of a welding machine remote control device implementing the present invention, and Fig. 39 is a diagram showing a transmitter attached to a welding rod holder. Fourth
The figure is a circuit diagram of the transmitter. FIG. 5 is a circuit diagram of the receiving section, FIG. 6 is a waveform diagram at each point in the receiving section, and FIG. 7 is a schematic circuit diagram of the control section. Fig. 8 is a schematic configuration diagram of a welding machine remote control device implementing the present invention in an analog method, and Fig. 9 shows waveforms at each point.
It is. l... Welding rod 2... Power supply part 3... Power transmission cable 4... Motherboard 5... Grounding cape JL/6... Transmission part 7... Control part 8... Remote control cable 9... Receiving section 61... Key matrix 62... Encoder 63... Modulation circuit 66...
Signal frequency oscillation circuit 67...Mixer circuit 68...Carrier wave oscillation circuit 70
... Microprocessor 71 ... Signal processing circuit 72 ... Excitation control circuit 91
... Filter 93 ... Waveform shaping circuit 96 ... Re-biopsy wave circuit 97 ... Tuning amplifier SW ... Switch L°°° Relay R ... Rotor Fig. 1 9 / Fig. 4 1'F )

Claims (2)

[Claims] (1) A welding rod that consumes power corresponding to the amount of work, a power transmission cable connected to the welding rod, a power supply section that supplies a variable amount of power to the welding rod via the power transmission cable, and a variable amount of power. In a welding machine remote control device consisting of a control unit that controls a welding machine, a transmitting unit that sends an electric signal for control to a single transmission line is attached to a welding rod holder, and the electric signal is detected from the transmission line. A welding machine remote control device characterized in that a receiving section is attached to a control section and a power transmission cable is used as a single signal transmission line. (2) The welding machine remote control device according to claim 1, wherein the transmitting section includes an encoder, the control section includes a microprocessor, and the electric signal is a digital code.