FI60983B - TRAODFRAMSKJUTNINGSANORDNING FOER TILLFOERSEL AV EN ELEKTRODTRAOD FRAON LAONGT AVSTAOND - Google Patents

Description

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Patent and registration authorities .... Ministry of Foreign Affairs. ,. ,. .. „, _. (44) Date of Nihtlvlktlpanon | t kuLlulkateu. -

Patent-och registerstyrelsen 'An * ök »n utitgd och utl.« Krift «n public · ™ * 29.01.82 (32) (33) (31) torit «t 30.01.73

Bulgaria-Bulgarien (BG) 225Jb Proven

Styrkt (71) DSO "Metalolene", Boul.Totleben 3 ^, Sofia, Bulgaria-Bulgarien (BG) (72) David Albert Samokovliski, Sofia, Georgi Natchev Natchev, Sofia,

Georgi Vassilev Batov, Bulgaria-Bulgarien (BG) (7M Oy Kolster Ab (ϋΛ) Wire protector for bringing electrode wire from a great distance - Tradframskjutningsanordning för tillförsel av en electrodträd frän längt avständ

The invention relates to a wire feeder for feeding welding wire over long distances.

Wire feeding devices are known for feeding welding wire over long distances, in which case one or two wire feeding mechanisms of the classical type are mounted on both ends of the connecting hose, i. wherein the feeding takes place by attachment to a welding wire on coils, the axes of the coils being perpendicular to the feeding direction. These coils are driven by a motor with a helical gear ratio with a relatively high reduction ratio. The wire feed speed is stabilized by stabilizing both wire feed mechanisms. Due to the relatively large expansion ratio used in classical wire feeders, the motor operates at virtually idle, i. the shaft torque does not change as the tensile and frictional forces of the wire-hose system change. When the difference manifests itself in the feed rates of both wire feed mechanisms, often due to the sudden bending or straightening of the connecting hose or the relative lengthening or shortening of the wire pushed through it, considerable 2,60983 mechanical forces occur, very often causing the coil to slide. Sliding can occur in the feed direction of the wire or in the opposite direction. In this case, the quality of the welding wire deteriorates, which in the end also adversely affects the goodness of the welding.

To overcome this drawback, some structural solutions use pre-feed coils of different diameters in pre- and post-mounted wire feeders, thus ensuring mechanical sliding without damaging the wire. In other solutions, mechanical sliding of the coils themselves is caused by these double friction couplings around their own axes. In other cases, corresponding coupling channels with different coefficients of friction between the coils and the wire are used in both wire feed mechanisms, in which case again the friction rollers attached to their own shafts come into question.

When different types of motors are used to synchronize the operation of both motors, e.g. a side current motor and a main current motor, or when another solution of the same quality is used, only a speed equalization of the speeds of both motors can be achieved. When the relative length of the welding wire changes abruptly, self-adjustment of the wire feed speed by means of a motor or the formation of an electric slip is no longer possible because the slowness of the reduction gear when kinematically connected to the feed rollers is too great. The same applies to arrangements that guarantee the same speed for both engines.

Arrangements are also known in which the differences formed in the length of the connecting piece are hydraulically compensated. The wire feeders are moved by means of a hydraulic actuator, whereby when a relative difference is formed between the lengths of the welding wire and the flexible hose, the wire is slid hydraulically on the rollers. The disadvantage of this wire feed method is that the arrangement is "too soft" and in the event of sudden resistance, the wire feed smoothness and correspondingly normal arc combustion are disturbed. in resistance, the uniformity of the feed is again relatively slow.

In the above-mentioned wire feeding devices for feeding welding wire over long distances, the following disadvantages occur: - no possibility of realizing electric sliding in the wire feeding system due to the use of a reduction gear; - uneven supply of welding wire due to this mechanical sliding in both wire feeders or due to the "softness" of the hydraulic drive unit; the impossibility to take advantage of the full power of the system due to the mechanical slip preset; 3 60983 - poor quality of the supply wire due to mechanical sliding of the wire on the spools, resulting in unacceptable damage; - no security of supply; - the high complexity of the arrangement required to control and synchronize the speeds of both the motors and the mechanical or hydraulic wire-feed arrangement; - high demands on the hose; - complex solutions in a wire feed system using hydraulic actuators, hydraulic couplings or mechanical components such as friction rollers, etc.

It is known to use a planetary wire feed mechanism according to the inventors' certificates VRB 10986, 12045 and 14017, in which case a reduction gear is not used and the quality of the feed wire is considerably improved. In this case, it is possible to guide the welding wire over long distances, in which case, however, the speed stability is reduced due to forced, random, mechanical loads. However, known control arrangements for feeding long distance welding wire use planetary wire feeding devices and this is effective if a certain limit is not exceeded, because otherwise local slippage of the wire on the coils occurs during overload.

It is an object of the invention to provide a wire feed apparatus for feeding welding wire over long distances, the developed wire feed apparatus having the following features: fast wire feed utilizing the full power of the operating arrangement to achieve increased maximum connection hose length using simplified equipment technology for actuator control and handling.

The object was solved by a known arrangement for feeding wire remotely, which device includes a wire feeder driven by a direct current motor, in the vicinity of which a coil for welding wire is arranged and a power supply for supplying a motor connected by a long flexible hose to a driving wire feeder driven by a motor. a hose with a handle to which a contact and an adjustable potentiometer are connected. What is new in the device according to the invention is that the traction wire feeder is driven by a controllable motor which, by means of a planetary traction device, determines a constant feed rate and adjusts the resistance of the welding wire in the hose, the speed of the ejection wire feeder varying according to this resistance value. the wire feeder acts as a sensor for the mechanical resistance of the welding wire in the hose. Both wire feeders (push and pull) 4 60983 operate by separate guest-excited DC motors whose speeds are controlled by two controllers supplied from a single power source. This power supply can be connected to a welding power supply, in which case the latter, taking into account the use of a wire transfer device for long-distance work, is placed in the vicinity of the wire feeder which pushes the wire. The speed controller of the wire feeder motor adjusts the wire feed speed to the desired one by means of a potentiometer with a handle placed on it or attached to a short hose, stabilizes the wire feed speed at the welding point and thus also the welding conditions. The wire feed motor controller, in turn, receives a signal from the wire feed motor load of the wire feeder and changes the wire feed speed so that the load caused by abrasion of the welding wire in the long hose is evenly distributed. The wire-drawing motor rotates smoothly, while the wire-pushing motor rotates at varying, sometimes reduced, sometimes increased speeds.

The solution presented above guarantees the interaction between the mechanical resistors present in the flexible hose and the electrical circuit using both motors. The variable speed of the motor pushing the wire, corresponding to the variations of the resistance of the hose, corresponds to the electrical sliding of the system in the direction of supply of the wire and in the opposite direction.

Another feature of the invention is that the electrical connection between the controllers of both motors is achieved using only two conductors placed in a flexible hose, by means of which the motor pulling the wire of the wire transfer mechanism is fed.

The use of this new system guarantees the following advantages: - Increased maximum distance when supplying welding wire per unit of power, as it is possible to take advantage of the full electric power of electric motors.

- Avoidance of possible mechanical slippage in the relative length change of the flexible hose with respect to the welding wire.

- Improved wire feed smoothness and stable arc in semi-automatic welding.

- Simplified hardware technology as much as possible due to the lack of control cables and connections. The connection between the two motors takes place by means of two or three conductors located in the housing of the standard hose.

- High sensitivity to rapidly occurring resistors and the ability to achieve a steady wire feed quickly and slowly.

- Good quality of the feed wire in the absence of mechanical slippage.

An example of the invention is shown in the accompanying drawings.

5,60983

Figure 1 is a schematic representation of an apparatus for feeding a welding wire over long distances in accordance with the invention.

Figures 2, 3 and 4 illustrate the passage of wire through a long flexible hose between both wire feeders.

Figure 5 shows the change in the feed speed of the wire pushing motor at the start of the wire pulling motor.

The welding wire 7 wound on the wire spool 8 - Fig. 1 - is pushed by means of an electric motor 3 and a wire wire feeding mechanism 1 moving the wire in a long flexible hose 5 in the direction E. The motor 3 is supplied from a power supply 13 via a regulator 14. Through the sheath of the hose 5 of length L, the welding current is supplied by means of a cable 17 from the power supply 13 to the welding point 11. A wire pulling mechanism 2 is mounted at one end of the long flexible hose by means of a motor 4. A wire feed mechanism 2 is driven. Potentiometer 16 is used to adjust the speed of the motor 4. The wire-drawing wire feeder 2 guides the wire in the hose 6 to the handle 10 (the hose can also be mounted on the handle 10) and from there to the welding point 11. The side line 18 provides a connection of the welding circuit from the long hose 5 jacket through the hose 6 jacket to the handle 10. the supply voltage is applied to the regulator 9 of the wire-drawing motor 4. Its speed is regulated by means of a potentiometer 16. Resistor 15 is connected in series to the supply circuit of controller 9. Molenqpia planetary wire feed mechanisms 1 and 2, which are in accordance with the inventors' certificates VRB 10986, 12045, 14017, are driven by motors 3 and 4 and are guided by wire 7 through a long, flexible hose connected to both mechanisms. The welding wire 7 is wound from a coil 8. The connection between the two motors is realized by means of an electrical connection 12 between the controllers of both motors.

The wire feeder according to Figure 1 operates as follows: In the initial position, the power supply 13 is switched on and the welding wire is passed through the long flexible hose 5 and the short hose to the handle 10. The contact 19 of the handle (or the relay controlled by it) is open. In this position, a small current (excitation current) is taken from the power supply 13, the voltage drop in the resistor 15 caused by which is not sufficient to connect the regulator 14 so that the motor 3 pushing the wire is also stopped. If at some point the switch 19 of the handle 10 is closed, the motor 4 starts, whereby more current flows through the resistor 15, the voltage drop of which is passed to the regulator 14 and the latter continues to supply voltage to the motor 3. The motor 3 also accelerates, but not as much ). During this time, the pulling wire feed mechanism 2 pulls the wire 7 through the long, flexible hose 5 60983 so that the amount of wire therein gradually decreases (Fig. 2). The wire is pressed against the wall of the tight flexible hose at A, B, C and D and this causes abrasion, the mechanical resistance in the hose increases and the motor is increasingly loaded due to the rollers mounted directly on the motor shaft of the pulling wire feeder 2. In an effort to maintain a constant speed, the current from the power supply 13 to the controller 9 increases. At the same time, the voltage drop in the resistor 15 increases, the controller 14 increases the energy supplied to the motor 3. The rotational speed of the motor 3 becomes higher than that of the motor 4, so that more wire is inserted into the long flexible hose than the pulling wire feed head 2 can receive and an excess wire is formed in the hose. In this case, the wire touches the wall at more points F, G, H, I, J, Y and R than before and the wire is unstressed. The load of the traction motor decreases, which is expressed as the magnitude of the current flowing through the resistor 15. The controller 14 supplies less energy to the pushing motor 3, whereby the engine speed decreases considerably. The amount of welding wire in the flexible hose decreases again, the motor 4 is loaded and the chain of events is repeated. After a few fluctuations, the speeds of motors 3 and 4 become the same. When the switch 19 is opened, the motor 4 stops, the current consumption decreases to the magnitude of the excitation current, the regulator 14 does not supply energy to the motor 3 and it stops.

The changes in the speed of the pushing motor 3 are shown in Fig. 5, where V 1 denotes the rotational speed of the pushing motor and the rotational speed of the driving motor.

When the relative length of the welding wire changes abruptly compared to the flexible hose, as it bends, the welding wire tensiones (Fig. 2) or loosens (Fig. 3), whereby its relative length relative to the hose 5 increases or decreases. In both cases, however, based on the above, an electric slip takes place between the wire feed mechanism 1 and the welding wire 7 by means of the electric motor 3 in the feed direction E (Fig. 2) or vice versa (Fig. 3).

Due to the mentioned advantages, the wire feeder can be widely used in house building, shipbuilding, etc.

Claims (2)

7 60983 1. Anordning for the purpose of a vehicle and a motor (3) driven for the purpose of driving a motor (1) and for the purpose of a vehicle (8) for the purpose of an engine (13) for a vehicle (13) low speed drives with low speed slings (5) to low speed drills (2), low speed drives with motor (4), low speed drills (6) with handles (10), low weight in contact (19) and in the potentiometer (16), on the other hand, in the case of a drag-and-drop motor (2) in the case of a power-assisted motor (4), in the case of a planetary motor (2) stranges and slangs, variables in particular in the case of third-party declarations (1) variations in the number of third-party declarations and in the case of third-party declarations (2) Mekaniska motständet hos träden i slangen. A device for supplying welding wire remotely, the device comprising a wire supply device (1) driven by a direct current motor (3), in the vicinity of which a coil (8) for welding wire is arranged and a power supply (13) for supplying a motor connected by a long flexible hose (5) to a traction wire feeder (2) driven by a motor (4) fitted with a hose (6) with a handle (10) to which a contact (19) and an adjustable potentiometer (16) are connected, characterized in that the traction wire feed the device (2) is driven by a controllable motor (4) which, by means of a planetary traction device (2), determines a constant feed rate and adjusts the resistance of the welding wire in the hose, the speed of the ejection wire feeder (1) varying according to this resistance value so that the wire between the feeders is free of tension and The pulling wire feeder (2) acts as a sensor for the mechanical resistance of the welding wire in the hose. Device for feeding a welding wire according to Claim 1, characterized in that the electrical connection between the two motors is effected by means of two lines (12) in a long, flexible hose (5). 2. An arrangement according to the preceding claim 1, which is an electric connection, in which case a motor motor is realized by means of a led (12), which is provided by a flexible tube (5).