JPS592585B2 - Welding torch oscillation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an on-rate device for automatically swinging a welding torch.

Conventionally, various types of on-rate devices have been used for welding torches. In this type of device, it is necessary to temporarily stop the tip of the torch at both ends or in the center during rocking, but in conventional devices, the tip of the torch must be temporarily stopped at both ends, the center, etc. Due to the inertia of the members, it has been difficult to always obtain an accurate stopping position over a wide range from low on-rate to high on-rate.

That is, FIG. 1 is a block diagram showing the configuration of a conventional on-rate device, in which reference numeral 1 indicates a drive source, such as starting a motor 2;
A speed control section that controls the on-rate speed, temporary stop position, etc. by controlling stop and speed; 3 is an on-rate mechanism section that converts, for example, the rotational motion of the electric motor 2 into reciprocating motion by an eccentric cam mechanism; 4 is an on-rate mechanism This is a welding torch which is oscillated by part 3. Reference numeral 5 denotes a position detector that outputs a signal when the welding torch 4 reaches a predetermined position within the swing range. The dog is adapted to generate a signal by actuating a microswitch attached to the fixed part VC.

In this conventional on-rate device, the output of the position detector 5 is supplied to the speed control section 1 to stop the electric motor 2, thereby stopping the swinging of the welding torch 4. The output of the position detector 5 is also supplied to a timer 6, which starts a timer and supplies an output to the speed controller 1 after the timer ends, so that the electric motor 2 is started and the welding torch 4 is oscillated again. The movement begins. As described above, conventional on-rate stopping is generally performed by detecting the position to be stopped using microswitches installed at both ends or in the center of the swing range. In this case, at a low on-rate, an accurate stopping position can be obtained by using the instantaneous braking motor, but as the speed increases, it is difficult to obtain an accurate stopping position due to the inertia of the movable parts. Therefore, a method is used to adjust the mounting position of the position detector 5 such as a microswitch depending on the on-rate speed, but this method requires the structure of the mounting part of the position detector 5 to be complicated and large. However, there were drawbacks such as the mounting position shifting during on-rate operation. In view of the above, the present invention delays the output of the position detector using a timer, and adjusts this delay time to a value suitable for the on-rate speed, thereby changing the swing stop position of the torch tip from both ends of its amplitude to the center. Its amplitude, along with being able to be set at any position of
The present invention provides an on-rate device for a welding torch in which the period and stop time can be set arbitrarily.

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

FIG. 2 shows the first embodiment of the present invention, in which 1 is a speed control section, 2 is an electric motor, and 3 is an on-rate mechanism that swings the welding torch 4 using the electric motor 2 as a drive source. Section 5 is a position detector such as a micro switch that outputs a signal when the welding torch reaches a predetermined position within the swing range.

6 is a timer for setting a stop time; 7 is a timer for setting a stop position; the output of the position detector 5 is supplied to the timer for setting a stop time 6 and also to the timer for setting a stop position 7; The outputs of these timers are given to the speed control section 1.

The speed control unit 1 is configured to stop the electric motor 2 when a signal is given from the stop position setting timer 7 and to start the electric motor 2 when a signal is given from the stop time setting timer 6. has been done. In addition to the above-described device, the time limit of the stop position setting timer 7 is set longer when the on-rate is low, and shorter when the on-rate is high. Further, the time limit of the stop time setting timer 6 is set longer than the time limit of the stop position setting timer 7. With this configuration, when the position detector 5 generates an output, the timers 6 and 7 simultaneously start the timer, and the stop position setting timer 7 first ends the timer and outputs the output to the speed controller 1. and stop the swinging of the welding torch 4 at a predetermined position.
Next, the stop time setting timer 6 completes the time limit and provides an output to the speed control section 1 to restart the swinging of the welding torch 4. As mentioned above, in the device of the present invention, the time limit of the stop position setting timer is set longer when the on-rate is low and shorter when the on-rate is high, so that the stop position setting timer is set to a shorter time when the on-rate is high. The welding torch can be temporarily stopped. Note that in this embodiment, the difference between the time limit of the stop time setting timer 6 and the time limit of the stop position setting timer 7 becomes the time limit for temporarily stopping the welding torch 4. If the time limit of the timer 6 is kept constant, the temporary stop time of the welding torch changes between low-speed on-rate and high-speed on-rate. In order to reduce this change, the difference between the time limit of the stop time setting timer device 6 and the time limit of the stop position setting timer device 7 is set to be equal to the time limit for temporary stop during low-speed on-rate and high-speed on-rate. It is also possible to change the time limit of the timer 6 in accordance with the change in the timer of the timer 7. FIG. 3 shows a second embodiment of the present invention, in which the output of the position detector 5 is transmitted to the stop position setting timer 7.
The output of this timer 7 is input to the stop time setting timer 6 and the speed controller 1.

The speed control section 1 also includes a speed regulator 8 for setting the on-rate speed, and the stop position setting timer 7 has a timer regulator 9.
It is equipped with The speed regulator 8 and time limit regulator 9 are mechanically or electrically connected so that they can be adjusted in conjunction with one knob. When the on-rate speed is high, the time limit of the time limit device 7 is shortened, and the on-rate When the speed is slow, the time limit of the timer 7 is adjusted to be longer. Therefore, with this device, it is possible to eliminate the hassle of adjusting both the on-rate speed and the time limit of the stop position setting timer device 7. In the apparatus shown in FIG. 3, the timer 7 starts a timer in response to the output signal of the position detector 5, and when the timer ends the timer, outputs are given to the speed controller 1 and the timer 6.

Therefore, when the welding torch 4 stops swinging, the timer 6 starts a timer, and when the timer 6 expires and output is given to the speed controller 1, the welding torch 4 starts swinging again. . In this way, in this embodiment, the time from when the stop time setting timer 6 starts the time until it outputs the signal is the time for temporarily stopping the power torch, so it depends on the on-rate speed. The degree to which the temporary stop time of the welding torch changes is only the time required for stopping the drive source 2, and can be made smaller than in the embodiment shown in FIG. 2. In addition, in the apparatus shown in FIG. 3, in order to stop the welding torch 4 at a position a certain distance away from the position set by the position detector 5, the timer of the timer 7 must be set to 1.
Either one may be added to obtain a longer time limit, or another timer may be added and connected so that the time limit of this timer and the timer of the timer 7 are added.

In each of the above embodiments (instead of FC, an air motor, hydraulic motor, etc. may be used as the drive source 2, and in this case, the on-rate speed control section 1 may be configured with a flow rate regulating valve, a pressure regulating valve, etc.) Furthermore, the on-rate speed control unit 1 includes, for example, an opening/closing contact of the electric motor 2 that opens and closes depending on the magnitude of centrifugal force caused by the rotation of the electric motor 2, and can adjust the relationship between the centrifugal force and the timing of opening and closing. The motor 2 may be connected in series to a driving power source 1 to control the speed of the motor 2 through on/off control.

The on-rate mechanism section 3 performs a pendulum-type on-rate,
The present invention can be applied to any on-rate device, regardless of the on-rate mechanism, on-rate shape, etc. Further, the position detector 5 may be any type that can detect the position, such as a micro switch, a proximity switch, or an optical switch, and there are no restrictions on the additional position or mounting method.

Further, the speed control unit 1 may be configured to stop the speed control unit 1 with a time limit end signal from the stop position setting timer 7 and start the speed control unit 1 with a time limit end signal from the stop time setting timer 6. Any type of circuit, such as a relay circuit or an electronic flip-flop circuit, may be used.

As described above, according to the present invention, regardless of the on-rate speed, the tip of the oscillating torch can always be accurately stopped at a preset position from both ends of its amplitude to the center, which is a practical benefit. is large.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a conventional on-rate device, and FIG. 2 and FIG.
FIG. 2 is a block diagram showing an embodiment of the invention. 1... Speed control section, 2... Drive source, 3
......On-rate mechanism section, 4...Welding torch, 5...Position detector, 6...Timer for setting stop time, 7... Timing device for setting stop position.

Claims (1)

[Claims] 1. In an oscillating device that drives an oscillating mechanism unit that swings a welding torch by a drive source, a position detector that outputs a signal when the welding torch reaches a preset position within a swinging range; A stop position setting timer which starts a timer based on the output of the position detector and generates a signal for stopping the drive source at the end of the timer, is provided with an output from the position detector or the stop position setting timer. 1. An oscillation device for a welding torch, comprising: a stop time setting timer that starts a timer when the timer is activated and generates a signal for starting the drive source when the timer ends.