Welding robot wire feeder type - OD robot

1. The wire feeder is divided into two types: integrated and separated. The wire feeder is installed on the rear of the upper arm of the robot and is integrated with the robot; The wire feeder and the robot are separated from each other.

Because the distance from the integrated wire feeder to the welding gun is shorter than that of the separate type, and the hose connecting the wire feeder and the welding gun is also shorter, the wire feeding resistance of the body type is smaller than that of the separate type. From the point of view of improving the stability of wire feeding, the integrated type is better than the separate type.

The integrated wire feeder, although the wire feeding hose is relatively short, but sometimes in order to facilitate the replacement of the wire reel, the wire spool or wire barrel is placed away from the safety fence of the robot, which requires the wire feeder to have a satisfactory pull force from the longer wire liner to pull the wire from the wire spool (barrel), and then through the hose to the welding gun For this situation, the wire feeder with a larger wire feeding force is selected in the same way as the separate wire feeder with a relatively long wire feeding hose. Ignoring this point often leads to the phenomenon of unstable wire feeding or even neutral silk.

Now, there are more and more integrated device methods for the wire feeder of arc welding robots, but it is necessary to choose a separate wire feeder for robots that want to actively replace the welding gun (change the diameter or type of welding wire) during the welding process.

Welding robot wire feeder type - OD robot

Welding robot wire feeder type - OD robot

2. The wire feeder is divided into one pair of rollers and two pairs of rollers according to the number of rollers. The structure of the wire feeder has a pair of wire feeding rollers and two pairs of rollers; There are those that only use one motor to drive one pair or two pairs of rollers, and there are also those that use two motors to drive two pairs of rollers separately.

From the point of view of wire feeding force, the wire feeding force of two pairs of rollers is greater than that of one pair of rollers. When the flux-cored wire is selected, because the flux-cored wire is relatively soft, the pressing force of the roller can not be as large as when using solid wire, in order to ensure that there is a satisfactory wire feeding thrust, the wire feeder with two pairs of rollers can have a better effect.

3. The wire feeder is divided into two types: open-loop and closed-loop according to the control method. The wire feeding speed control method of the wire feeder can be divided into open loop and closed loop. At present, most of the wire feeders still choose the open-loop control method, and some choose servo motors equipped with photoelectric sensors (or encoders) to achieve closed-loop control of the wire feeding speed, which is not affected by the fluctuation of network voltage or wire feeding resistance, so as to ensure the stability of the wire feeding speed.

For pulse TIG welding of filament filling, it is possible to choose a wire feeder that feeds the wire continuously, and a pulsating wire feeder that can synchronize with the welding pulse current can also be selected. The pulsation frequency of the pulsating wire feeder can be controlled by the power supply, and the length of the wire can be adjusted at will. Pulsating wire feeders are also capable of continuous wire feeding, so there has been an increase in the number of pulsed TIG welding robots equipped with pulsating wire feeders in recent years.

4. The wire feeder is divided into three types: push type, wire drawing type and push and draw type according to the direction of wire feeding power.

· Push type. It is mainly used for welding wire with a diameter of 0.8-2.0mm, and it is the most widely used wire feeding method. It is characterized by the simple and light structure of the welding gun, easy to operate, but the welding wire needs to enter the welding gun through a longer wire feeding hose, and the welding wire encounters greater resistance in the hose, which affects the stability of the wire feeding, and the general hose length is 3-5m.

· Wire drawing. It is mainly used for fine welding wire (the diameter of the welding wire is less than or equal to 0.8mm), because the rigidity of the wire is small, and the wire pushing process is easy to deform, and it is difficult to push the wire. The wire feeding motor and the wire spool are installed on the welding torch when drawing, because the wire feeding force is small, so the power of the wire drawing motor is small, but despite this, the wire drawing welding gun is still heavier. It can be seen that although the wire drawing type ensures the stability of wire feeding, because the welding gun is heavy, the load of the robot is added, and the operating range of the welding gun is limited.

· Push-drawn wire type. The welding torch operating range can be added and the wire feed hose can be extended up to 10 m. In addition to the wire pusher, a wire drawing machine is also installed on the welding gun. Wire pushing is the primary driving force, and wire drawing machine simply straightens the wire to reduce wire pushing resistance. Thrust and tensile force need to be well matched, the general drawing speed should be slightly faster than the wire pushing, although this method has some advantages, but because of the complex structure, the adjustment is troublesome, and the welding torch is heavier together, so the actual use is not much.

The wire supply device is specially designed to supply the welding wire to the welding gun, and the wire pushing type single roller wire feeding method is the first choice in robot welding. That is, a transfer wire roller is arranged on one side of the wire winding frame, and then the welding wire is transmitted to the welding gun through the conduit. In MIG welding of aluminum alloys, various measures have been taken to overcome the difficulty of the welding wire at the roller due to its softness, which occurs at the beginning of the welding process or during the welding process.

Welding robot wire feeder type - OD robot

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