JPS594973A - Welding machine controlling device - Google Patents

Abstract

PURPOSE:To obtain a welding machine controlling device that does not require exclusive multicore cable for selecting welding condition in a remote place, free from generation of disconnection, and excellent in working efficiency, by counting the number of times of closing of output terminal of welding power source during suspension of welding and selecting welding condition according to the number of times of closing. CONSTITUTION:A counting memory circuit 4 that counts and stores the number of times of short-circuiting of output terminals (a) and (b) is connected to a welding power source 1 that supplies DC power to a welding torch 2 and an object 3 to be welded. The circuit 4 has an auxiliary power source for discriminating short-circuiting or opening when the power source 1 is not outputted. A selector circuit 5 that selects welding condition according to output of the circuit 4 is provide. A prohibition circuit 6 that cuts off transmission of signal to the circuit 4 and prohibits rewriting of content while receiving welding signal from the power source 1 is provided on the input side of the circuit 4. When specified circuit between the torch 2 and weld zone 3 is short- circuited repeatedly at relatively short opening interval, the number of times of short- circuiting is counted in the circuit 4, and the circuit 5 selects welding condition according to the output, and supplies to the power source 1.

Description

[Detailed Description of the Invention] The present invention is capable of adjusting welding conditions such as welding voltage, welding current, feeding speed of consumable electrode wire, or welding speed when performing arc welding, changes in welding posture and changes in the shape of the workpiece. It is often necessary to change welding conditions due to such reasons. Furthermore, in shipyards, ironworks, and the like where large objects to be welded are handled, the installation location of the welding power source and the actual work location are often far apart. In such a case, it would be very inconvenient and inefficient to go to the welding power source and change the welding conditions every time the conditions change. Therefore, it is necessary to have a welding condition adjuster at hand so that the operator can adjust the welding conditions to appropriate conditions as necessary. For this purpose, it is necessary for the operator to have at hand a variable resistor corresponding to each welding condition.

Conventionally, in such a case, each variable resistor and the 8-connector body were connected using dedicated cables. However, in this case, it is necessary to use multi-core cables, which not only increases the incidence of disconnection accidents, but also significantly impedes work efficiency due to the need to route thick cables. .

The present invention eliminates the drawbacks of the conventional devices, and provides a welding machine control device that does not require an increase in cables, has good operability, and is equipped with a welding condition remote adjustment function.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In the figure, 1 is a welding power source, which supplies, for example, DC power to a welding torch 2 and an object to be welded 3.

Numeral 4 is a counting storage circuit for counting and storing the number of times the output terminals a and b of the welding power source 1 are shorted, and has an auxiliary power source for determining whether a short circuit or an open circuit occurs when the welding power source 1 is not outputting. 5 is a selection circuit that selects welding conditions according to the output of the count storage circuit 4; 6 is provided on the input side of the count storage circuit 4 and stores counts while receiving a solution signal from the welding power source 1; This is a prohibition circuit that blocks the transmission of signals to the circuit 4 and prohibits rewriting of the contents. , 7 is a push button switch for starting welding, and for example, a torch switch provided on a welding torch is used.

In the figure, until the switch 7 is closed, the welding power source 1 does not emit an output, and the output voltage from the auxiliary power source of the count storage circuit 4 is applied between the welding torch 2 and the workpiece 3. In this state, if the welding torch and the workpiece are repeatedly short-circuited at relatively short intervals,
The number of short circuits is counted by the count storage circuit 4. The selection circuit 5 selects welding conditions according to the output of the count storage circuit and supplies the selected welding conditions to the welding power source 1. When the switch 7 is closed at the start of welding, the welding power source 1 outputs welding power between the terminals a and b, and the circuit 6 inhibits the in-solution signal W from the terminal d.
In response to this, the prohibition circuit 6 cuts off the input signal to the count storage circuit 4, thereby preventing the welding conditions from being changed even if there is a short circuit between terminals a and b thereafter.

This in-solution signal from the welding power source 1 needs to continue from the time the switch 7 is closed until the end of welding, but the counting memory circuit 4 is designed to count only short circuits lasting a certain period of time or longer. In this case, the in-solution signal may be outputted not when the switch 7 is closed, but when the welding current is detected.

It is desirable to use a counter with a latch function as the count storage circuit 4, but when the number of welding conditions to be selected is small, a ratchet relay, stepping relay, keep relay, or normal auxiliary IJ L/- may be used. It may also be configured by a contact point.

FIG. 2 is a block diagram showing another embodiment of the present invention. The embodiment shown in FIG. 1 replaces the counting storage circuit 4 of the embodiment shown in FIG. 1 with a counting circuit 8. It is separated into a memory circuit 9 and a holding command circuit 1O.

In the figure, numerals 1 to 3 and 5 to 7 indicate components having the same functions as the embodiment shown in FIG. 8 is a counting circuit connected to the output terminals 3 and b of the welding power source 1 to count the number of times that the terminals a and b are short-circuited. have

9 receives a command signal to hold the output of the counting circuit 8 at terminal E;
10 is a holding command circuit connected in parallel with the counting circuit 8, and 10 is a holding command circuit connected in parallel with the counting circuit 8 when the output terminals a and b of the welding power source are connected for more than a relatively long predetermined time. When the open state continues, this is detected and a holding command signal is supplied to the E terminal of the memory circuit 9, and then a return signal C is supplied to the counting circuit 8. The prohibition circuit 6 is provided between the holding command circuit 10 and the storage circuit 9, and while receiving the signal W in solution from the welding power source 1, the prohibition circuit 6 blocks the transmission of the holding command signal to the storage circuit 9 and stores it. It is connected so as to prohibit rewriting of the contents of the circuit 9.

In the figure, until the switch 7 is closed, the welding power source 1 does not emit any output, as in the example shown in FIG. The output voltage from is applied. In this state, when the welding torch 2 and the workpiece 3 are repeatedly short-circuited a predetermined number of times with relatively short open intervals, the number of short-circuits is counted by the counting circuit 8 and transmitted to the memory circuit 9. At this time, since the hold command signal has not yet been input to the E terminal of the memory circuit 9, this value is not taken in. Welding torch 2 and workpiece 3
When both are kept open after repeating the short-circuit with the same a predetermined number of times, the hold command circuit 1o detects this relatively long open time and outputs a hold command signal to the inhibition circuit 6. At this time, the prohibition circuit 6 is not in welding yet, so the welding power source 1
The holding command signal received from the in-solution signal W is transmitted as it is to the E terminal of the memory circuit 9. The memory circuit 9 is E
When the terminal receives a holding command signal, the counting circuit 8
Import the counting results. On the other hand, when the holding command circuit 10 detects a long open time, it outputs a holding command signal C and then outputs a return signal C to the counting circuit 8 to return the counting circuit 8 to its initial state. The selection circuit 5 receives the contents stored in the memory circuit 9, selects welding conditions corresponding to the hexagonal signal, and supplies the selected welding conditions to the welding power source.

When the switch 7 is closed after the welding conditions have been selected in this manner, the welding power source 1 outputs the welding pattern corresponding to the welding conditions selected by the selection circuit 5 between the terminals a and b, and welding is started. Upon this start of welding, a solution signal W is output from the d terminal of the welding power source 1, and a cutoff operation is performed to prevent the signal from being transmitted to the prohibition circuit 6.
Prohibits signal capture and storage for As a result, even if a short circuit occurs between the welding torch 2 and the workpiece 3 after welding has started, the welding conditions will not be changed.

In the case of the same figure, the signal in the solution from the welding power source 1 is not the signal when the switch 7 is closed, but the signal in the solution when the counting circuit 8 is used to count only short circuits of a certain time or more, as in the example of FIG. 1. It is possible to output the in-solution signal only while the current is being detected. Further, it is also possible to use a contact type circuit such as a ratchet ray for the counting circuit 8, or to use a digital counter.

FIG. 3 is a connection diagram showing a specific example of the main parts of the embodiment shown in FIG. and a waveform shaping circuit are common, and the holding command circuit 10 receives a branched signal from the middle of the counting circuit 8. The counting circuit 8 includes an auxiliary power source El, a diode DR1 for preventing the output from the welding power source 1 from being mixed in, and a resistor R8.
It consists of a relatively short delay circuit consisting of a 1° R82 and a capacitor C81, a waveform shaping circuit consisting of a Schmitt trigger circuit 81, and a counter 82, and closes the circuit between the welding torch 2 and the workpiece 3. Counting is performed after noise caused by sloping input signals is removed by a waveform shaping circuit. The memory circuit 9 captures the output of the counter 82 when receiving a pulse at the E' terminal, stores it at the falling edge of the input pulse at the E terminal, and converts the output of the latch circuit 91 into a decimal number. It consists of a decoder 92 for As this memory circuit 9, a combination of a commercially available binary IC circuit and a decoder as an element with a latch function can be used, but if the number of welding conditions is small, a rotary complete ratchet relay or a keep relay may be used in addition to the counter 82. It may also be a contact type using. The hold command circuit 1O is composed of a DC power supply E3, a transistor TRIQ, resistors 101 to R104, a capacitor (101, a comparator 101, and monostable multivibrators 102 and 103. The output of the intermediate Schmitt trigger circuit 81 is received by the transistor TR10, and the capacitor 101 is charged through the resistor 101. This charging voltage is discharged through the resistor 102 when the output of the Schmitt trigger circuit 81 disappears.

The terminal voltage of the capacitor C101 is the voltage obtained by dividing the DC power supply E3 by resistors 103 and 104, and the comparator 1.
Compare by 01. If a resistance value of 101 to R104 is selected for each resistor, the positive output of the trigger circuit 81 will cause the terminal voltage of the capacitor C101 to be applied to the resistor R.
It is charged to a value higher than the terminal voltage of 104. When the voltage at the terminals of capacitor C101 exceeds the voltage at the terminals of resistor R104, comparator 101 produces a positive output. next,
Terminals a and b are opened, and the Schmitt trigger circuit 81
After the output disappears, resistor R102 and capacitor C10
capacitor C10 according to a time constant determined by 1
The terminal voltage of capacitor C101 drops and is reversed when the terminal voltage of capacitor C101 becomes lower than the terminal voltage of resistor R104. When the output of the comparator 101 falls, the monostable multi-vibrator 102 generates a pulse with a predetermined width and supplies it to the monostable multi-vibrator 103 as well as the inhibit circuit 6.
also supplied. The monostable multivibrator 103 generates a pulse of a predetermined width according to the fall of the input signal, and the counter 8
The counter 82 is reset by outputting a reset signal C to the counter 82. The selection circuit 5 includes transistors TR5-1 to TR5-n that conduct according to the output of the memory circuit 5, relays CRI to CRn connected in series to each transistor, Haas resistors R5-1 to R5-n, and a DC power source E2. Each welding condition includes, for example, n variable resistors VR5-1 to VR5-n selected by the contacts of relays CRI to CRn and backflow blocking diodes DR5-1 to DR5-n, as shown in FIG. A known welding condition setting circuit consisting of DR5-n can be used. It goes without saying that this welding condition setting circuit is provided in a number corresponding to the types of welding conditions required.The prohibition circuit 6 is an AND gate, which closes when receiving the welding raw signal W from the welding power source 1, and closes when the welding raw signal W is received from the welding power source 1. It opens when W disappears. Therefore, in the case of the figure, the welding raw signal W of the welding power source 1 is an explanatory diagram for explaining the operation when selecting a signal characteristic in which the welding raw signal W of the welding power source 1 is at a low level during welding and at a high level when not welding. In the figure, (a) shows the voltage change between terminals a and 2 of the welding power source 1, (bl is the terminal voltage of the capacitor C81 in FIG. 3, (C) is the output voltage of the Schmitt trigger circuit 81, and (fJ and (gl is monostable multibibreak 1
The outputs of 02 and 103 are shown respectively. In FIG. 5, the welding torch 2 contacts the workpiece twice, from time t1 to [2] and from time t3 to t4, and the welding power source 1
An example is shown when terminals a and b are closed. Before the time [1], the capacitor C81 is charged by the power source E1. When the terminals a and b are closed at time [1], the capacitor C81 starts discharging at a rate determined by the resistor R82, but the critical voltage e of the Schmitt circuit 81. Even if the voltage between a and b suddenly changes due to chattering or the like until it reaches □, it will not react to this. When the closed circuit state continues for a certain period of time or more, the voltage of the capacitor C81 reaches the critical voltage e. When the voltage decreases to 1 or less, the Schmitt trigger circuit 81 outputs an output. Next, when terminals a and b are opened at time t2, capacitor C81 is charged again. At this time as well, the critical voltage e of capacitor CI, resistors R81 and R82, and Schmitt trigger circuit 81. The Schmitt trigger 81 does not respond to short-term openings within the time determined by 2 and responds only to longer openings. Schmitt trigger circuit 81 responds in the same manner at times t3 and t4. In this way, the input signal, which is likely to be mixed with noise, is waveform-shaped and supplied to the counter 82 and also to the transistor TRIQ, which is made conductive to charge the capacitor C101. When the terminals a and b are opened for a certain period of time or more and the output of the Schmitt trigger circuit 81 disappears, the transistor TRIQ is cut off and the capacitor C101 starts discharging through the resistor R102. The discharge time constant at this time is made sufficiently longer than the time constant of the waveform shaping section. The open time between terminals a and b is time [2
When it is short, such as from to 13, capacitor C1
The terminal voltage of the resistor 01 does not become lower than the terminal voltage of the resistor 104, and is charged again and recovered when the terminal a and b are closed again at the next time [3].

At time [4], the terminals a and b are opened again, and from then on, if this state is maintained, the capacitor Cl0I continues to discharge, and at time L5, the terminal voltage e of 104 is finally applied to the resistor to a value lower than reach

As a result, the output of the comparator 101 is inverted, and the monostable multivibrator outputs a pulse h of a predetermined time width when the output of the comparator 101 falls. This pulse h becomes a holding command signal and is supplied to an inhibition circuit 6 consisting of an AND gate. At this time, welding power source 1 is not welding, so the output W
Since is at a high level, the inhibit circuit 6 is open and supplies the hold command signal to the E terminal of the latch circuit 91 of the memory circuit 5.

The latch circuit 91 captures the output of the counter 82 when an input signal is supplied to the E terminal, and stores the captured signal when the E terminal input disappears. In the example of FIG. 5, since there are two substantial closings between terminals a and b, the count content of the counter 102 at time t is "2", and at time [5] the monostable multivibrator is 102
When the hold command signal RI is output from the latch circuit 91, the latch circuit 91 takes in this .degree.2,' and holds it when the signal RI disappears. The output signal of the monostable multivibrator 102 is caused to fall, but at this time, no signal is already supplied to the E terminal of the latch circuit 91, so the contents of the latch circuit 91 are held as @2''.This latch circuit The contents of 91 are converted by a decoder 92 and supplied to the selection circuit 5, which excites a predetermined relay and selects the welding conditions.After this, when terminals a and b are closed again, the Schmitt trigger is activated. The circuit 81 generates an output, and the counter 82 counts the number of times the circuit is closed again.This counting result is generated by the holding finger when the terminals λ and b are opened for a relatively long time.

When welding is started, a low-level solution signal is supplied from the d terminal of the welding power source 1 to the inhibition circuit 6 to close it, so that even if the terminals a and b are opened and closed from now on, the memory circuit 9 will be closed. Content power S will not be changed.

In the above embodiment, the prohibition circuit 6 is provided between the hold command circuit 10 and the memory circuit 9 to transmit and cut off the hold command signal. Alternatively, it may be placed on the input side of the counting circuit 8, between the counting circuit 8 and the memory circuit 9, etc.

As described above, in the present invention, the number of times the output terminal of the welding power source is closed during the welding stop period is counted, and the welding conditions are selected according to the number of times the welding power source is closed, so the welding conditions can be changed remotely. There is no need to prepare a dedicated multi-core cable for selection, and there are no disconnection accidents.
A device with excellent workability can be obtained.

[Brief explanation of drawings]

1 and 2 are configuration diagrams showing an embodiment of the welding machine control device of the present invention, FIG. 3 is a connection diagram showing a specific embodiment, and FIG. 4 is a selection circuit 5 of the embodiment of FIG. 3. FIG. 5 is a schematic diagram showing an example of a welding condition setting circuit selected in FIG. DESCRIPTION OF SYMBOLS 1... Welding power source, 4... Counting memory circuit, 5... Selection circuit, 6... Prohibition circuit, 8... Counting circuit, 9...
・Memory circuit, 10... Holding command circuit, 102.103
...Monostable multivibrator agent Patent attorney Hiroshi Nakai Figure 5 Procedure ■Specie (self-motivated) October 19, 1980 Commissioner of the Japan Patent Office 1, Indication of the case 1988 Patent Application No. 114737 2. Name of the invention Welding machine control device 3. Relationship with the amended person case Patent applicant No. 2-1-11 Tayo, Yodoyo-ku, Osaka (126) Osaka Transformer Co., Ltd. 4, Agent

Claims (1)

[Scope of Claims] 1. A welding power source, a count storage circuit that counts and stores the number of times the output terminal of the welding power source is closed, and a selection circuit that selects welding conditions based on the output of the count storage circuit; A welding machine control device comprising a prohibition circuit that prohibits changes in selected welding conditions during welding. 2. The welding machine control device according to claim 1, wherein the count storage circuit is a circuit that performs counting only when the output terminal of the welding power source is closed for a certain period of time or more. 3. The welding machine control device according to claim 1, wherein the count storage circuit is constituted by a stepping relay that advances one step each time the output terminal of the welding power source is closed. 4. A welding power source, a counting circuit that counts the number of times the output terminal of the welding power source is closed, a memory circuit that stores the counting result of the counting circuit, and an open circuit of the output terminal of the welding power source for a certain period of time or more. a holding command circuit that detects the input signal and instructs the memory circuit to store the input signal and resets the counting circuit; a selection circuit that selects welding conditions based on the output of the memory circuit; A welding machine control device comprising a prohibition circuit that prohibits changes in welding conditions. 5. The welding machine control device according to claim 4, wherein the counting circuit performs counting only when the output terminal of the welding power source is closed for a certain period of time or more. 6. The holding command circuit includes a time limit circuit that outputs a voltage that rises when the input voltage falls below a certain value and returns when the state continues to be higher than the certain value for a predetermined time, and a fall of the output of the time limit circuit. a first monostable multivibrator that operates when the output of the first monostable multivibrator falls; and a second monostable multivibrator that operates when the output of the first monostable multivibrator falls; The circuit according to claim 4, which is a circuit that supplies the storage circuit as a storage command signal and outputs the output of the second monostable multivibrator as a return signal for the counting circuit. The described welding machine control device. 7. According to any one of claims 4 to 6, the prohibition circuit is 2, a gate circuit that is provided between the holding command output terminal of the holding command circuit and the storage circuit and is closed at least during welding. The described welding machine control device. 8. The prohibition circuit is a circuit that is provided between the output terminal of the welding power source and the input terminal of the memory circuit and transmits the number of times of closing of the output terminal of the welding power source to the memory circuit only during non-welding. A welding machine control device according to any one of claims 4 to 6.