JPS592587B2 - yosetsu thiosylate touch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding electrode on-rate device that turns on-rate a welding electrode according to an electrical signal having a preset period and waveform.

As a device for turning the welding electrode on-rate, a cam or other mechanical device is usually used.

However, using mechanical devices, it is difficult to change various elements that are particularly important in welding, such as on-rate width, on-rate speed, stopping time, and stopping position, and it is almost impossible to change these elements, especially during welding. It was possible. The present invention provides an on-rate device that allows the above-mentioned elements to be easily and accurately adjusted and set by controlling the welding electrode in accordance with electric signals.
The present invention will be explained in detail below with reference to the illustrated embodiments.

FIG. 1 schematically shows an embodiment of the present invention.
1 is an arithmetic circuit having input terminals 1a and 1b, 2 is a switch circuit, and 3 is an integrator.The output of the arithmetic circuit 1 is supplied to the integrator 3 via the switch circuit 2.

Reference numeral 4 designates a pulse generator for setting a stop time at both ends, which receives the output signal of the arithmetic circuit 1 and generates an output for a preset time when the output of the arithmetic circuit changes. added to the control input terminal of 2,
The switch circuit 2 is configured to open only while a signal from the pulse generator is applied.

Reference numeral 5 denotes a signal generator for setting both end positions of the on-rate width of the welding torch 6, and this signal generator outputs a lower limit setting signal e1 and an upper limit setting signal E2 corresponding to both end positions of the on-rate width. .

The output of the signal generator for both end position setting is given to one input terminal 1a of the arithmetic circuit 1 via the start switch 7, and the output signal E of the integrator 3 is given to the other input terminal 1b of the arithmetic circuit 1.
x is input. Arithmetic circuit 1 receives integrator output signal E
The level of x and the level of the two setting signals El and e2 output by the both end position setting signal 5 are compared, and the signal 1ex
It is detected and stored that 1 exceeds the setting signals 1e11 and 1e21, and two signals with different signs are alternately output. The arithmetic circuit 1 to both end position setting signal generator 5 constitute a geon rate signal generation circuit A. The output signal Ex of the on-rate signal generation circuit A (output signal of the integrator 3) obtained at the output side of the integrator 3 is supplied to the welding torch drive source 9 via the summing point 8, and the torch 6 is driven by this drive source. Driven. 10 is a torch position detection device provided on the moving axis of the welding torch 6 to detect the position of the torch;
The position detection signal β obtained from this detection device is negatively fed back to the summing point 8.

The torch position detection device 10 is constructed by connecting a series circuit of two DC power supplies 10b and 10c in parallel to both ends of a potentiometer 10a.The connection point of the b1 DC power supplies 10b and 10c is grounded. The configuration is such that when the torch 6 is at a position corresponding to the zero output voltage of the arithmetic circuit 1, the output signal β of the torch position detection device 10 becomes zero.
As the torch position detection device 10, other than a potentiometer, a position detection device such as a differential transformer can be used. In the above device, the start switch 7 is switched to the ground side before starting the on-rate.

In this case, the output of the integrator 3 is zero, and the torch 6 is at the zero position (usually at the center of the on-rate width). When the start switch 7 is switched to the both-end position setting signal generator 5 side to start the on-rate, the output signal of the signal generator 5 is supplied to the arithmetic circuit 1, and the output signal of the arithmetic circuit 1 is supplied to the switch circuit 2.
is supplied to the integrator 3 via. Output signal E of integrator 3
As time passes, x increases at a constant rate of increase up to the level of the upper limit setting signal E2 obtained from the signal generator 5, and when the magnitude of the signal Ex exceeds the level of the upper limit setting signal E2, the arithmetic circuit An output signal of 1 inverts its sign. This reversal of the sign causes the pulse generator 4 to generate a pulse with a constant time width, thereby turning off the switch circuit 2. Therefore, the level of the output signal Ex of the integrator 3 is maintained approximately at the upper limit set value E2. When the pulse generator 4 stops generating pulses, the switch circuit 2 becomes conductive, and the integrator 3 is supplied with the output of the arithmetic circuit 1 whose sign has been inverted. Therefore, the output Ex of the integrator 3 decreases at a constant speed with respect to the level of the upper limit setting signal E2, and when the level of the output Ex becomes lower than the level of the lower limit setting signal e1, the sign of the output signal of the arithmetic circuit 1 changes. Flip again. Due to this change in output, the pulse generator 4 generates a pulse to shut off the switch 2, and the output Ex of the integrator 3 is set to the lower limit setting signal e1.
level. When the signal from the pulse generator 4 disappears after a certain period of time has passed, the switch 2 becomes conductive, and the output Ex of the integrator 3 rises toward the level of the upper limit setting signal E2. Thereafter, similar operations are repeated, and the on-rate signal generation circuit A outputs an on-rate signal Ex in the form of a trapezoidal wave, which looks like the top of a triangular wave has been cut off.
The output signal Ex of the integrator 3 is compared with the position detection signal β of the torch position detection device 10 at the summing point 3, and the difference Ex-β is supplied to the welding torch drive source 9. The welding torch drive source 9 moves the torch 6 in the direction of decreasing the difference Ex-β.
The torch 6 drives the output signal E of the integrator 3.
On-rate operation is performed with an on-rate width set according to x. In this case, since feedback control is performed using the output of the torch position detection device 10, the mechanical delay of the drive mechanism is compensated, and the torch 6 accurately follows the signal Ex. Second
The figure shows a specific embodiment of the on-rate signal generating circuit A shown in FIG.

In the figure, 7 is a start switch, 101, 102 are comparators, 103 is a flip-flop circuit, 201, 202 are AND gates, 203 is a NOR gate, 204, 205
is a switching element, 301 is an arithmetic circuit, 401, 40
Reference numeral 2 denotes a single pulse generator for setting a stop time, and 1 both-end position setting signal generator 5 has a built-in constant voltage source for setting a lower limit setting signal e1 and an upper limit setting signal E2. The comparators 101 and 102 and the flip-flop circuit 103 constitute an arithmetic circuit 1.AND gates 201 and 202
, NOR gate 203, and switch elements 204, 20
5, a switch circuit 2 is constructed. Further, an integrator 3 is configured by an operational amplifier 301, a resistor R3Ol, and a capacitor C3Ol, and single pulse generators 401, 40
A pulse generator 4 is constructed as shown in FIG. Figure 3 shows
The waveforms of each part of the device shown in FIG. 2 are shown. FIG. The waveform of the output signal Ex (output signal of the integrator) is shown.

Further, FIG. 3C shows the output waveform of the single panel generator 402, and FIG. 1D shows the output of the single pulse generator 401. In the figure, e1 and E2 indicate the voltage value of the lower limit setting signal and the voltage value of the upper limit setting signal, respectively, and TPl is the upper limit and lower limit stop time determined by capacitor C4O2 and variable resistor VR4O2, and capacitor C4Ol and variable resistor VR4O2, respectively. It shows. First, let us consider the case in which the start switch 7 is switched to the both-end position setting signal generator 5 side in the apparatus shown in FIG. 2 to enter a steady operating state.

Now, the output level of the Q terminal of the flip-flop circuit 103 is a trigger level (hereinafter referred to as H level), the output level of the Q terminal is a non-trigger level (hereinafter referred to as L level), and the output level of the 1-pulse generators 401 and 402 is Assuming that the output level is at a no-voltage output level (hereinafter referred to as L level), the output level of NOR gate 203 is H level, and therefore the output level of AND gate 201 is also H level, and the output level of AND gate 202 is L level. Become.
As a result, the switch elements 204 and 205 become conductive and non-conductive, respectively.
3Ol, resistor R3Ol, and an operational amplifier 301. The output voltage of the amplifier 301 (output voltage of the integrator) Ex becomes Ex={1ev1 with the passage of time.
/(C3Ol・R3Ol)}t (at t=0, Ex=
0), it increases as shown in FIG. 3b. When this output Ex exceeds the upper limit setting signal voltage E2, the output of the comparator 102 changes from L level to H level. This polarity change causes the single pulse generator 402 to
- Generates a pulse with a fixed time width determined by VR4O2. Therefore, the AND gates 201, 202 and the M gate 203 all output L level, and the D1 switch elements 204 and 205 are non-conductive, that is, the output voltage becomes zero, regardless of the stable state of the flip-flop circuit. Therefore, during the time period TP1 during which the pulse output of the single pulse generator 402 continues, the input to the integrating circuit is cut off, and the output voltage Ex of the integrator is held at a value slightly exceeding the upper limit setting signal voltage E2. This time TPl is the upper limit stop time at which the torch stops at one end of the on-rate width. On the other hand, comparator 10
As the output of the flip-flop circuit 103 changes to the H level as described above, the output of the comparator 1 is connected to the set terminal S of the flip-flop circuit 103.
Since the H level signal of the comparator 102 is supplied to the reset terminal R, the output terminal Q of this flip-flop circuit changes to the L level and the output terminal Q changes to the H level. When the output pulse of the single pulse generator 402 disappears after the time set by Q4O2 and VR4O2 has passed, the output of the NOR gate 203 becomes H level again9, and this time the output of the AND gate 201 becomes L level. A
When the output of the ND gate 202 is at H level, the D1 switch elements 204 and 205 are rendered non-conductive and conductive, respectively, and the power supply voltage +Ievl is supplied to the integrating circuit. Therefore, as shown in FIG. 3b, the output voltage Ex gradually decreases from a value slightly exceeding the upper limit setting signal E2 (by the time constants C3Ol and R3Ol). Output voltage Ex decreases to lower limit setting voltage e1
When the voltage becomes lower, the output of the comparator 101 changes from L level to H level, and the single pulse generator 401 outputs C4Ol·V.
A pulse with a constant time width determined by R4Ol is generated. Therefore, the output of NOR gate 203 is at L level, and AN
The outputs of D gates 201 and 202 are both at L level 9, and switch elements 204 and 205 are both non-conductive. Therefore, during the period TP2 during which the pulse from the pulse generator 401 continues, the input to the integrating circuit is cut off regardless of the stable state of the flip-flop circuit 103, and the output voltage Ex remains at a value slightly lower than the lower limit setting signal voltage e1. is maintained. This time T,2 is the lower limit stop time at which the torch stops at the other end of the on-rate width. On the other hand, as mentioned above, the output of the comparator 101 is at the H level, but at this time the output Ex has already become much lower than the upper limit setting signal voltage E2, so the output of the comparator 102 is at the L level. The output terminal Q of the flip-flop circuit 103 becomes H level. When the time set by C4Ol and VR4Ol has passed and the output of the pulse generator 401 becomes L level, the NOR
The output of gate 203 is at H level, AND gate 2
01 and 202 go to H level and L level, respectively, and the output Ex reaches the lower limit setting signal voltage e as shown in FIG. 3b.
It gradually increases from 1 to the upper limit setting signal voltage E2. Thereafter, the same operation is repeated to obtain a trapezoidal waveform output signal having a flat portion as shown in FIG. 3b. Then the second
In the circuit shown in the figure, consider the situation when the start switch 7 is switched to the side of the both-end position setting signal generator 5 to start the on-rate operation, that is, the state before entering the above-mentioned steady state. While the switch 7 is initially connected to the ground side, the comparator 101,
Since the set voltage of 102 is zero, the output voltage of the integrator E
x is also zero. At the moment when the switch 7 is connected to the signal generator 5 side, the set voltage El,
e2 is applied. At this time, since the output Ex is again zero, the output of the comparator 101 changes from the L level when the switch 7 was grounded to the H level, and the output of the D1 comparator 102 remains at the L level. Therefore, the pulse generator 40
1 generates a pulse for a certain period of time determined by C4Ol and VR4Ol, and during this time the AND gates 201, 202 and N
The output of OR gate 203 becomes L level. Therefore, both switch elements 204 and 205 are rendered non-conductive, and the output Ex remains zero for a certain period of time. (See Figure 3b.) After a certain period of time determined by C4Ol and VR4Ol has elapsed, the output of the pulse generator 401 returns to the L level.
The outputs of NOR gate 203 and AND gate 201 are H.
The output of AND gate 202 becomes L level, and switch elements 204 and 205 become conductive and non-conductive, respectively. The output Ex of the integrated integrator is C3Ol・R3
It rises to the upper limit set value E2 at a rising speed determined by Ol, and thereafter enters the above-mentioned steady operation. Therefore switch 7
When the output signal Ex is switched to the signal generator 5 side, the waveform of the output signal Ex becomes a waveform that maintains the zero level for a certain period of time and then deforms into a trapezoidal shape, as shown in FIG. 3b.

When such an on-rate signal generation circuit is used in the apparatus shown in Fig. 1, the welding torch 6 that has stopped at the center before welding starts
Even after welding has started, welding is performed while being maintained at the center position for a certain period of time, and then the welding begins in a steady on-rate operation and welding progresses. To stop the on-rate operation, switch 7 is switched to the ground side.

In this case, since the set voltages of the comparators 101 and 102 become zero, Ex becomes zero and the D1 torch stops at the center position. The stopping positions of this torch are El, e2 and 10b, 10
Depending on the setting of c, it may not be at the center of the on-rate amplitude, but in the above explanation, for convenience, it is all expressed as the center position.
FIG. 4 shows another embodiment of the on-rate signal generating circuit A in FIG. , 104 and 105 are comparators, and 11 is an intermediate stop position setting signal generator having a constant voltage source for obtaining set voltages E3 and E4 therein.

Comparators 104 and 105 output the output of the signal generator 11 and the signal E.
x is input, and pulse generators 403 and 404 receive outputs of comparators 104 and 105, respectively. Further, in this embodiment, the NOR gate 203 has four input terminals, and the outputs of the pulse generators 401 to 404 are input to these input terminals. Other points are the same as in FIG. When the circuit shown in FIG. 4 is used, the waveform of the output signal Ex becomes the waveform shown in FIG.

As shown in the figure, the output signal Ex is C3Ol/R3Ol
The output of the comparator 105 becomes H level when it gradually increases at a rising speed determined by and reaches the intermediate stop position setting voltage E4. Pulse generator 404 is C4O4/VR4O
A pulse is generated for a certain period of time Tp4 (intermediate stop period) determined as shown in FIG. 4, and Ex interrupts rising during this period. Time TP
4l) After S elapses, when the output of the pulse generator 404 becomes zero, Ex continues to rise again, and when it exceeds the upper limit setting signal voltage E2, the time TP is determined by C4O2 and VR4O2 again.
Stop for l. After the time TPl has elapsed, Ex begins to fall by the same operation as explained in connection with FIG.
When the intermediate stop position setting voltage E3 is reached, the output of the comparator 104 becomes H level and the pulse generator 403 outputs C4O3.
A pulse is generated for a certain period of time TP3 (intermediate stop time) determined as VR4O3, and during this period Ex interrupts its descent.
Period T? After a while, Ex continues to fall again, and when Ex becomes lower than the lower limit setting signal voltage e1, C4Ol・
The change in Ex stops for a time TP2 determined by VR4Ol. After time TP2 has elapsed, Ex begins to rise again, and the same operation is repeated thereafter. Therefore, using the circuit of FIG. 4, it is possible to obtain an on-rate signal that stops the torch for a fixed period of time at both ends and in the middle of the on-rate amplitude.

In FIG. 2 and FIG. 4, the upper limit and lower limit setting signal e1
By changing the level of E2 and E2, the on-rate amplitude can be changed, and the intermediate stop position setting signal E3, e
By changing 4, the intermediate stop position can be changed. Also C4Ol・VR4Ol and C4O2・VR4
By changing O2, the stop time at both ends can be changed, and C4O3/VR4O3 and C4O4/V
By changing R4O4, the intermediate position stop time can be changed. In FIG. 1, the start switch 7 does not necessarily need to be provided between the both-end position setting signal generator 5 and the arithmetic circuit 1, and it is allowed that the operation at the start of the on-rate becomes somewhat irregular. In this case, between the arithmetic circuit 1 and the switch circuit 2, between the switch circuit 2 and the integrator 3, between the integrator 3 and the summing point 8, and between the summing point 8 and the welding torch drive source 9. It can also be provided between the two.

In addition, the welding torch drive source 9 drives the welding torch 6 by an electric signal.
Any device that can cause on-rate movement can be used, such as a combination of an amplifier and an electric motor, or a combination of a flow rate control valve and a fluid cylinder. In FIGS. 2 and 4, single pulse generators 401 and 4
Although the input signals of 02 are obtained from the comparators 101 and 102, these input signals may also be obtained from the Q terminal and the Q terminal of the flip-flop circuit 103. Further, the gate circuit and the switching circuit are not limited to the configurations shown in FIGS. 2 and 4, and can of course be modified in various ways.

As described above, according to the device of the present invention, the on-rate width,
Since all important welding elements such as stop time, stop position, and on-rate speed can be controlled electrically, adjustment is easy and accurate.1 Also, these various elements can be controlled remotely, which was not possible with mechanical devices. This has the advantage that automation can be easily realized.

Furthermore, even during welding, the settings of each element can be changed without interrupting welding, so it is also possible to programmatically control the on-rate conditions in each welding position during circumferential welding.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 is a connection diagram showing a specific embodiment of the on-rate signal generation circuit in the embodiment of Fig. 1, and Fig. 3 shows the various parts of Fig. 2. Waveform diagram, 4th
This figure is a connection diagram showing another embodiment of the on-rate signal generating circuit, and FIG. 5 is an output waveform diagram of the embodiment of FIG. 4. DESCRIPTION OF SYMBOLS 1... Arithmetic circuit, 2... Switch circuit, 3... Integrator, 4... Pulse generator, 5... Both end position setting signal generator, 6... Welding torch, 7...・Start switch, 8... Addition point, 9... Welding torch drive source, 1
0...Torch position detector, 101, 102, 104,
105... Comparator, 103... Flip-flop circuit, 201, 202... AND gate, 203...
NOR gate, 204, 205... switch element, 3
01... Arithmetic amplifier, 401, 402, 403, 40
4...Single pulse generator, 501...Both end stop position setting signal generator, 502...Intermediate stop position setting signal generator.

Claims (1)

[Scope of Claims] 1. A drive source for reciprocating the welding torch, a torch position detector provided on the moving axis of the torch, and an output based on a time constant set in advance in accordance with the moving speed of the torch. The output signal level of the integrator is determined by comparing the magnitude of the output signal of the integrator with an integrator that increases or decreases the voltage, and two setting signals preset corresponding to both end positions of the torch's amplitude, respectively. an arithmetic circuit that detects and stores that the signal level of the set signal has been exceeded and alternately outputs two signals with different signs; and an arithmetic circuit that detects and stores that the signal level of the setting signal has been exceeded and alternately outputs two signals with different signs; a pulse generator for setting a both-end stop time that outputs a signal for a preset time, and a signal that is supplied from the arithmetic circuit to the integrator when the output signal of the pulse generator is input. A welding torch oscillation device comprising: a switch circuit, and supplying a difference signal between an output signal of the integrator and an output signal of the torch position detector to the drive source. 2. A drive source that reciprocates the welding torch, a torch position detector provided on the moving axis of the torch, and an integrator that increases or decreases the output voltage according to a preset time constant corresponding to the moving speed of the torch. Then, the magnitude of the output signal of the integrator is compared with two setting signals preset corresponding to the positions of both ends of the swing width of the torch, and the output signal level of the integrator is determined to be the signal level of the setting signal. an arithmetic circuit that detects and memorizes the fact that the torch has exceeded the limit and alternately outputs two signals with different signs; and a preset time corresponding to the stop time at both end positions of the torch when the output signal of the arithmetic circuit changes. a pulse generator for setting a both-end stop time that outputs a signal for the integrator; a comparator that compares the magnitude of the output signal of the welding torch with a preset signal corresponding to the intermediate stop position of the welding torch's swing width; and a pulse generator for setting an intermediate stop time that outputs a signal for a preset time corresponding to the pulse generator. A welding torch oscillation device, characterized in that the welding torch is stopped at an intermediate position of the oscillation amplitude during the duration of the output signal of the pulse generator for setting the intermediate stop time.