JP6827178B2 - Welding torch - Google Patents

Description

The present disclosure relates to a welding torch, particularly to a welding torch incorporating a wire feeding device for feeding wires.

A welding torch incorporating a wire feeding device for feeding wires is disclosed, and a configuration for cooling a motor for feeding wires is disclosed using a shield gas supplied to the welding torch as a cooling medium. For example, see Patent Document 1).

On the other hand, in the control of consumable electrode type arc welding in which pulse welding and short-circuit welding are alternately repeated, the normal and reverse wires are periodically repeated during the short-circuit welding period, and the welding current is immediately before the end of the pulse period. It is known that by starting the normal feeding of the wire when the current is smaller than the base current, the generation of spatter can be suppressed and stable welding can be realized. It is also known that by shortening the cycle of forward feed and reverse feed, the actual welding speed can be further increased and the generation of spatter can be suppressed (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2016-129465 International Publication No. 2016/075871

When the forward and reverse wires are fed at high speed, the wire wears severely and the amount of abrasion powder increases. It is necessary to remove the wear debris from the wire because it may cause a ground fault from a part through which an electric current flows to a part (motor, etc.) that should not flow, or a tracking factor of an insulating part, which may cause burning. On the other hand, it is necessary to cool the motor for wire feeding.

The present invention solves the above-mentioned conventional problems, and provides a welding torch capable of cooling a motor and also removing abrasion powder of a wire.

In order to solve the above problems, the welding torch of the present invention includes a feed unit provided with a feeding component and a motor for feeding wires, a motor holder provided so as to cover the motor, and a torch body. The motor holder includes a first cooling unit that cools the side surface of the motor and a second cooling unit that cools the other side surface of the motor, and the first cooling unit has a first inflow port and a first outflow port of the cooling fluid. The second cooling unit has a second inlet of the cooling fluid, a second outlet, and a second flow passage connecting them, and the first outlet and the above. The second inflow port is connected, the second inflow port is connected to the third inflow port located inside the feed unit, and the third inflow port is connected to the fluid outlet provided below the feed component. ..

The cooling fluid flows through the first cooling unit and the second cooling unit to cool the motor, and then flows out from the fluid outlet toward the vicinity of the feeding component.

The welding torch of the present invention can cool the motor and also remove wear debris from the wire.

External view of the entire welding torch according to the embodiment of the present invention Top view of the motor holder of the welding torch according to the embodiment of the present invention. Side view of the motor holder of the welding torch according to the embodiment of the present invention (arrow view A in FIG. 2). Another side view of the motor holder of the welding torch according to the embodiment of the present invention (arrow view B in FIG. 2). CC sectional view in FIG. DD sectional view in FIG. EE sectional view in FIG. Partial external view of the feed unit in FIG. 1 with the cover removed. Figure of arrow C in FIG.

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

FIG. 1 is an overview view of the entire welding torch. The welding torch includes a motor holder 1 that covers the motor 5 (see FIG. 5 and the like), and a feed unit 2 that has a mechanism for sending a welding wire 203 from the tip of the torch body 3 by the motor 5. The motor 5 is fixed to the feed unit 2 via an insulating component. The motor holder 1 is connected to the tip of the manipulator (not shown) of the welding robot via the torch holder 4.

FIG. 2 is a top view of the motor holder 1 (including the motor) with the feed unit 2 and the torch body 3 removed. FIG. 3 is a side view of the motor holder 1 (arrow view A in FIG. 2), and FIG. 4 is a side view of the other side of the motor holder 1 (arrow view B in FIG. 2).

The motor holder 1 has a configuration in which a first cooling unit 11 having a flow path through which a cooling fluid for cooling the motor 5 flows and a second cooling unit 12 having the same configuration sandwich both side surfaces of the motor 5. .. The first cooling unit 11, the second cooling unit 12, and the motor flange 13 are configured to wrap the outer shell of the motor 5, and the shaft 51 of the motor 5 projects from the motor flange 13. A gas such as air is used as the cooling fluid here.

Next, the two cooling units will be described in detail with reference to FIGS. 5 and 6. FIG. 5 is a CC cross section of FIG. 2, and FIG. 6 is a DD cross section of FIG.

The inlet pipe 110 connected to an external compressor or the like is connected to the first inflow port 111 (see FIG. 4) which is the inlet of the cooling fluid of the first cooling section 11, and the first inflow port 111 is the first cooling section. It is connected to the first continuous passage 113 provided inside the 11, and the first continuous passage 113 is connected to the first outlet 112 (see FIGS. 4 and 6) which is an outlet of the cooling fluid from the first cooling unit 11. ing. The first outlet 112 is open in a direction intersecting the axial direction of the motor 5. The axial direction means a direction along the axis 51 of the motor 5.

Here, the first passage 113 can be easily manufactured, for example, by using aluminum as the base material of the first cooling unit 11, carving a groove from one side surface side thereof, and covering the entire groove with a plate material to cover the groove. Is.

The second cooling unit 12 is provided with a second inflow port 122 (see FIGS. 3 and 5) that serves as an inlet for the cooling fluid from the first cooling unit, and the second inflow port 122 is inside the second cooling unit 12. The second passage 123 is connected to the second outlet 121 (see FIG. 3), which is the outlet of the cooling fluid from the second cooling unit 12 to the outside. The second outlet 121 is connected to the outlet pipe 120. The second inflow port 122 is open in a direction intersecting the axial direction of the motor 5.

The first inflow port 112 and the second inflow port 122 are connected by a pipe-shaped connector 14 in a direction intersecting the axial direction of the motor 5. The connector 14 is configured to be fitted into the recesses of the first cooling unit 11 and the second cooling unit 12 via the O-ring 15. Even if the connector 14 is not used, the first inflow port 111 has a convex shape that protrudes from the side surface of the first cooling unit 11, and the second inflow port has a concave shape that is recessed from the side surface of the second cooling unit 11. These may be connected by fitting them. In this case, the configuration becomes simpler and the reliability is improved.

It should be noted that the first outlet 112 and the second inflow port 122 are connected inside the first cooling unit 11 and the second cooling unit 12, that is, like the above-mentioned fitting 14 and the fitting of the unevenness. It is preferable that the configuration is not exposed to the outside. It can be protected from external dust and the like, and in particular, it can be protected from welding spatter and the like.

In the above configuration, the cooling fluid enters from one end of the inlet pipe 110 and flows out to the outlet pipe 120 via the first cooling unit 11 and the second cooling unit 12.

FIG. 7 is an EE cross section of FIG. A wiring opening 18 which is an outlet of the wiring 52 of the motor 5 is provided on a part of the upper mating surface of the first cooling unit 11 and the second cooling unit 12, and wiring is provided so as to cover the wiring opening 18. A cover 16 is provided. The wiring 52 is guided to the outside through the wiring hole cap 19 provided in the wiring cover 16 as shown by the alternate long and short dash line in FIG. The wiring 52 guided to the outside is connected to a control device of the robot or the like.

As described above, except for the shaft 51, the motor 5 is covered by the motor flange 13, the first cooling unit 11, the second cooling unit 12, and the wiring cover 16. As a result, the motor 5 can be protected from external dust and the like, and in particular, it can be protected from welding spatter and the like. It is preferable to have the wiring cover 16, but the effect can be exhibited without it.

Further, as shown in FIGS. 6 and 7, heat conductivity is provided as a heat transfer member between the first cooling unit 11 and the side surface of the motor 5, and between the second cooling unit 12 and the other facing side surfaces of the motor 5. The elastic sheet 17 of the above is sandwiched. As a result, the adhesion between each cooling unit and the motor 5 is enhanced, and the cooling effect is improved. By changing the thickness of the elastic sheet 17, it is possible to adopt another motor and cope with the case where the outer shape is different.

Silicone rubber, acrylic rubber, or the like can be used for the elastic sheet 17, but the elastic sheet 17 is not particularly limited to this, and may be a heat conductive grease such as silicon.

Further, as shown in FIG. 1, one end of the torch holder 4 is fixed to the anti-motor flange 13 side of the second cooling portion 12 of the motor holder 1, and the other end is fixed to a place near the tip of the manipulator. As a result, the motor holder 1 can be used as a component in which the entire welding torch is offset from the tip of the manipulator, the outer shape of the torch holder 4 can be reduced, and a compact welding torch for a robot can be provided.

On the other hand, the other end of the outlet pipe 120 is connected to the third inflow port 201 in the feed unit 2. The UF base 20 provided with the third inflow port 201 is provided with a fluid outlet 202, and the cooling fluid entering from the third inflow port 201 is discharged from the fluid outlet 202.

A wire feeding component is arranged on the upper part of the UF base 20. As shown in FIG. 7, the wire 203 is sandwiched between the feed roller 204 attached to the shaft 51 of the motor and the pressurizing roller 206 that is pressurized to the feed roller side by the pressurizing adjustment unit 207, and the motor 5 Is fed to the tip of the torch body 3 by the rotational movement of the torch body 3.

Since a welding current flows through the wire 203 during welding, the feed roller 204 is insulated from the motor shaft 51 by an insulator 205.

The feeding parts here refer to the feeding roller 204, the pressure roller 206, and the insulator 205.

In such a configuration, when the forward and reverse feeds of the wire 203 are performed at high speed, the wire 203 is heavily worn due to the friction between the wire 203 and the feed roller 204 and the pressure roller 206, and wear powder is generated. When the amount of wear debris increases and adheres to the insulator 205, it is conceivable that the feed roller 204 and the motor 5 are electrically connected and a welding current flows to the motor 5.

Therefore, as shown by the arrow in FIG. 6, the cooling fluid is ejected from the fluid outlet 202 of the UF base 20 toward the feed component such as the insulator 205 and the feed roller 204 so that the wear debris can be removed. It has become. Then, the cooling fluid containing the removed abrasion powder is discharged to the outside of the feed unit 2.

Here, the cooling fluid discharged from the fluid outlet 202 is discharged in a direction opposite to the welding point (direction of the tip of the torch body 3) so as not to interfere with the shield gas used for gas shielded arc welding. That is, the cooling fluid is ejected upward from below the feed component.

In addition, it is conceivable to use a shield gas as the cooling fluid, but not only the shield gas is warmed and causes deterioration of welding quality, but also there is a risk of time lag reaching the welding point and gas leakage in the cooling member because it passes through the cooling flow path. Since there are various demerits such as adjustment of the required flow velocity, the cooling fluid and the shield gas at the time of welding are different fluids here.

The shape, diameter, number, and position of the fluid outlet 202 can be arbitrarily set, and the cooling fluid can be applied to the feed roller 204 or the like to remove or prevent adhesion of abrasion powder.

Further, when the flow rate of the cooling fluid required to cool the motor 5 is constant, the shape, diameter, and number of the fluid outlets 202 can be arbitrarily set, so that the flow velocity of the cooling fluid discharged from the fluid outlet 202 can be arbitrarily set. Can be done.

As described above, the welding torch of the present invention can be applied to a welding robot or the like that is attached to the tip of a manipulator and automatically performs welding.

1 Motor holder 2 Feed unit 3 Torch body 4 Torch holder 5 Motor 11 1st cooling part 12 2nd cooling part 13 Motor flange 14 Connector 15 O-ring 16 Wiring cover 17 Elastic sheet 18 Wiring opening 19 Wiring hole cap 51 Shaft 52 Wiring 110 Inlet pipe 111 1st inflow port 112 1st inflow port 113 1st continuous passage 120 Outlet pipe 121 2nd inflow port 122 2nd inflow port 123 2nd consecutive passage 201 3rd inflow port 202 Fluid outlet 203 Wire 204 Feeding Roller 205 Insulation 206 Pressurized roller

Claims (3)

A feed unit equipped with a feed component and a motor for feeding wires,
A motor holder provided so as to cover the motor and
Equipped with a torch body
The motor holder includes a first cooling unit that cools the side surface of the motor and a second cooling unit that cools the other side surface of the motor.
The first cooling unit has a first inflow port of a cooling fluid, a first outflow port, and a first flow passage connecting them.
The second cooling unit has a second inflow port of a cooling fluid, a second outflow port, and a second flow path connecting them.
The first outlet and the second inlet are connected to each other.
The second outlet is connected to a third inlet located inside the feed unit.
The third inflow port is a welding torch that connects to a fluid outlet located below the feed component. The welding torch according to claim 1, wherein the cooling fluid flows through the first cooling unit and the second cooling unit to cool the motor, and then ejects the cooling fluid from the fluid outlet toward the vicinity of the feeding component. The welding torch according to claim 2, wherein the cooling fluid is different from the shield gas for gas shielded arc welding.

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