JPS5815423Y2 - Wire feeding control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wire deflection amount detection device for a push-pull type wire feeding device.

In general, in automatic or semi-automatic arc welding using consumable welding wire, a push-pull type wire feeder is used when the wire supply source, rewire reel installation location, and welding location are far apart. Ru.

By the way, in this type of wire feeding device, the welding wire fed out from the wire reel is fed through a relatively long wire feeding path, so the feeding resistance of the wire is large.
In addition, as welded structures have become larger in recent years, the consumption of welding wire used for welding has also increased.
The wire winding of the wire reel used for this also has considerable weight.

Therefore, the feeding load on the wire feeding device becomes very large, and the drive motor of the wire feeding device that feeds the wire by feeding it out from the wire reel also needs to have a large capacity. becomes large, making it impossible to obtain the response speed necessary for welding, and the bushing side feeding speed cannot keep up with the change in the pull side feeding speed due to wire consumption at the tip of the torch, and the pull side feeder and bushing side A difference in feeding speed occurs between the feeders.

Therefore, the wire is not fed smoothly, causing the wire to slip or buckle, which not only makes it impossible to perform a good welding operation, but also causes welding defects and damage to the welding equipment.

Therefore, in the past, in order to eliminate the above-mentioned feeding speed difference, the wire fed between the bushing side and pull side feeders was first given a deflection, and the amount of deflection was detected using a potentiometer or the like. The feed speed of the pull-side feeder was detected by a tacho generator, etc., and the output voltage of the tacho generator was controlled by the detection amount of the potentiometer and supplied to the input end of the control circuit, which was connected to the output end of the control circuit. A system has been implemented in which the speed of the drive motor of the bush side feeder is controlled so that the amount of deflection is always constant.

By the way, when detecting the amount of deflection of the wire, if plastic deformation occurs in the wire, not only will it not be possible to feed the wire smoothly through the wire feeding path, but the delivery angle of the welding wire sent out from the tip of the torch section will not be the same. However, there was a risk that the welding work would be hindered.

Therefore, it is necessary to allow the wire to be bent gently over a relatively long distance, which inevitably increases the size of the device. The work of inserting the welding wire was also frequent.

The present invention was developed in view of the above circumstances, and it fixes one of the bush and pull feeder that feeds the wire, makes the other movable, and connects these feeders with an elastic wire guide. The amount of linear movement of either the bush or the pull feeder, which is connected by a pipe and whose position changes depending on the wire feed speed difference between the bush and the pull feeder, is converted into an electrical quantity via a converter. The feeding speed of the bush feeder is controlled by this amount of electricity, and the difference in feeding speed between the bush and pull feeder can be eliminated with an extremely small and simple configuration. ,
Moreover, it is an object of the present invention to provide a wire feeding control device that does not cause plastic deformation of the wire and allows the wire insertion operation to be extremely simple.

Embodiments of the present invention will be specifically described below with reference to the drawings.

As shown in the figure, a welding wire 2 wound around a wire reel 1 is let out by a bush feeder 3 and sent to a pull feeder 5 via a wire guide tube 4. The welding torch section 6 is fed by the following steps.

By the way, the bush feeder 3 and the pull feeder 5 are provided at positions separated from each other by a predetermined distance, the pull feeder 5 side is fixed, and the bush feeder 3 side is fixed on the rail 7.
The pull feeder 5 is placed and fixed on a cart 8 that moves forward and backward in the direction of the pull feeder 5.

The wire guide tube 4 connects the bush feeder 3 and the pull feeder 5 to feed the welding wire 2, and its central portion is made of a flexible tube with elasticity. are doing.

A potentiometer 9 is disposed at one end of the truck 8 as a converter for converting the amount of linear movement of the truck 8 into an electrical quantity, and is connected to the sliding contact piece 9b of the potentiometer 9.
The tip of a telescopic rod 9a that slides together with b is connected and fixed to one end of the carriage 8.

Next, connect the sliding contact piece 9b of the potentiometer 9 to the input end of a control circuit (not shown), and connect the fixed terminal 9c to the input terminal of the control circuit (not shown).
, 9d are connected to the output end of a tacho generator (not shown) that detects the feeding speed of the pull feeder 5.

Further, the output end of the control circuit is connected to the drive motor of the bush feeder 3.

According to such a configuration, when the drive motor driving the bush feeder 3 and the pull feeder 5 is started, the welding wire 2 wound around the wire reel 1 is moved by the bush feeder 3. The wire is drawn out and sent to a pull feeder 5 via the wire guide tube 4, and further fed to the welding torch section 6 by the pull feeder 5.

Now, if the consumption of the welding wire 2 in the welding torch section 6 increases and the feeding speed of the pull feeder 5 is increased, or if the feeding load of the bush feeder 3 increases for some reason, , the feed speed of the bush feeder 3 is slower than that of the pull feeder 5.

Therefore, the welding wire 2 is pulled toward the pull feeder 5 side, causing the wire guide tube 4 to contract, and the bush feeder 3
is moved together with the trolley 8 in the direction of arrow A as shown in FIG. 2a.

Therefore, the rod 9a of the potentiometer 9 fixed to the carriage 8 similarly moves its sliding contact piece 9b in the force direction of arrow A, thereby reducing the resistance value of the potentiometer 9.

Then, the output voltage of the tacho generator is controlled according to the amount of decrease in the resistance value of the potentiometer 9, and when inputted to the control circuit, the control circuit increases the feeding speed of the bush feeder 3 according to the amount of change, and pulls the The feed speed of the feeder 5 is followed.

Next, if the consumption of welding wire 2 in the welding torch section 6 decreases, the feeding speed of the pull feeder 5 decreases, or the feeding load of the bush feeder 3 decreases for some reason, the pull The feeding speed of the bush feeder 3 is faster than that of the feeder 5.

Therefore, the welding wire 2 is deflected within the wire guide tube 4, causing the wire guide tube 4 to expand, and the bush feeder 3 to be moved along with the carriage 8 as shown by the arrow B in FIG.
move in the direction.

Therefore, the rod 9a of the potentiometer 9 fixed to the trolley 8 similarly moves its sliding contact piece 9b in the direction of arrow B, increasing the resistance value of the potentiometer 9.

Then, when the output voltage of the tacho generator is controlled according to the amount of increase in the resistance value of the potentiometer 9 and inputted to the control circuit, the control circuit decreases the feeding speed of the bush feeder 3 according to the amount of change, and pulls the The feed speed of the feeder 5 is followed.

Therefore, even if a difference in feeding speed occurs between the bushing and pull feeders 3 and 5 due to changes in the consumption amount of welding wire 2 or fluctuations in feeding load, the feeding speed of the bushing feeder 3 is always pulled. Since the feeder 5 can be operated synchronously with the feeder 5, welding defects caused by slipping or buckling of the welding wire 2, damage to the welding equipment, etc. can be prevented.

In addition, since the feeding speed difference occurring between the bush and pull feeders 3 and 5 is detected by the amount of linear movement of the cart 8 on which the bush feeder 3 is placed, the device is extremely small and simple. Therefore, the cost required for the device is extremely low.

Furthermore, since the welding wire 2 is fed through the wire guide tube 4, plastic deformation does not occur. Therefore, the welding wire 2 can be fed smoothly, and the welding wire 2 that is The insertion work is also extremely simple.

Although the amount of linear movement of the trolley 8 is detected by the potentiometer 9 in this embodiment, it may be detected by a non-contact type detector using a differential transformer or the like.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the operation of the embodiment. 2... wire, 3... bush feeder,
4...Wire guide tube, 5...Pull feeder, 9...Potentiometer.

Claims (1)

[Scope of utility model registration request] A bush feeder and a pull feeder, one of which is fixed at a position spaced apart from each other by a predetermined distance, and the other is moved forward and backward in one direction, and the bush and pull feeder are connected. A wire guide tube that feeds the wire and has at least a portion that is stretchable; and either the bush or the pull feeder whose position changes depending on the wire feeding speed difference between the bush and the pull feeder. It is characterized by comprising a converter that converts the amount of linear movement into an amount of electricity and detects it, and a controller that controls the wire feeding speed of the bush feeder according to the output of the converter. Wire feeding control device.