JPS599270B2 - Semi-automatic arc welding torch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a semi-automatic arc welding torch using consumable or non-consumable electrodes.

In general, semi-automatic welding torches for GMA (consumable electrode type gas shielded arc) welding, TIG or plasma (non-consumable electrode type gas shielded arc) welding, or non-gas encapsulated arc welding are widely used for welding steel, non-ferrous metals, etc. is,
It helps to obtain excellent weld properties.

When welding with conventionally used semi-automatic welding torches, there is no weaving mechanism at all in order to weave the arc generation point as necessary, so the operator must manually weave the desired trajectory. It is common knowledge that there is.

However, when an operator performs such weaving manually, the weaving speed is relatively slow for the purpose of shaping the bead, etc., so the purpose can be achieved. However, as the welding speed increases, the weaving speed typically must also increase, and manual adjustment by the operator becomes limited. Even if this is not the case, it goes without saying that performing weaving welding manually and in any position requires considerable skill, and it is currently difficult to train such technicians. be. It is also well known that when aluminum, stainless steel, titanium, etc. are welded by GMA or TIG, bubbles are likely to form in the weld metal, and in order to prevent the occurrence of such defects, pulse current control, etc. are required for these materials. Attempts have been made to weld by adding an arc or by welding by drawing a sinusoidal or circular arc trajectory. Conventionally, the devices that implement this method of controlling the trajectory of the arc are mainly fully automatic, large, and complex structures, which are difficult to apply to on-site work such as various constructions and structures. There was a drawback. Like the conventional semi-automatic welding torch, the present invention is lightweight, but like the fully automatic type mentioned above, the arc generating point of the welding electrode can be shaped into any shape during welding, such as a sine wave, a circle, or a double circle. The present invention provides a semi-automatic arc welding torch having a mechanism as shown in the figure.

By using this torch, you can improve the efficiency of semi-automatic welding work in particular, expand the field of application, and automatically weld any shape using the conventional general torch operation method, even if you are not a skilled technician. This makes it possible to draw the welding pattern, resulting in a significant improvement in welding quality even when welding in all positions.
That is, the present invention includes a rotary motor for vibrating the welding electrode inside the torch handle, and an eccentric shaft equipped with an eccentric amount adjusting section is coupled to the rotary motor via a rotation transmission gear, and the eccentric shaft and the free bearing section are connected to the rotary motor through a rotation transmission gear. This semi-automatic arc welding torch is characterized in that it is connected to the electrode held by a removable vibration transmission plate, and has excellent functions as described above. The present invention will be explained in detail below.

The arc welding torch of the present invention is similar in appearance to a conventional semi-automatic torch, but the arc generation point at the tip of the welding electrode is shaped into an arbitrary shape such as a sine wave or a circle inside the torch handle. A vibration source for drawing, ie, a vibration source such as an electric motor or an air motor, is built in, and the power from the vibration source is transmitted to the eccentric shaft via gears or the like.

The eccentric shaft has an adjustment mechanism that can continuously vary the amount of eccentricity as desired, and a vibration transmission plate is coupled to the tip of the eccentric shaft. Since the transmission plate needs to have a different shape depending on the arbitrary figure to be drawn on the tip of the electrode, it is of a type that can be easily attached and detached. Further, the vibration transmission plate and the electrode driving plate are coupled by an insertion pin to transmit power from the vibration source to the tip of the electrode.

Purchasing like this? When the welding method is GMA, the torch of the present invention is assembled so that the consumable electrode is sent out inside the contact tip, but when the welding method is TIG, for example,
The electrode can be replaced with an electrode with tungsten fixed to the contact tip, and the welding power source can be changed to an appropriate one as needed. Also, in plasma welding, by replacing and attaching a plasma welding nozzle to the contact tip part, the arc generating part can easily obtain an arbitrary locus pattern.

At this time, the welding power source can be used without any problem by connecting it for plasma welding. Furthermore, when applying to other consumable electrode types and welding methods such as non-gas encapsulation and submerged arc welding, by using a welding power source with constant voltage characteristics and drooping characteristics according to each welding method, it is possible to adjust the arc generation area to any desired location. You can also draw a shape and weld it. Next, the torch of the present invention will be described in more detail based on the drawings. First, FIG. 1 shows one embodiment of the torch of the present invention, and is a partially cut away perspective view of the torch.

The torch of the present invention vibrates the tip of the welding electrode 1 to obtain an arbitrary figure, and in the example of the torch shown in the same figure, the tip of the electrode has a reciprocating linear locus of amplitude W as shown by the solid line and the broken line. We have shown what causes the formation of

The electrode 1 is a consumable electrode core wire in the figure, and although not shown, it is unwound from a welding wire reel, passed through the power supply cable 2, introduced into the electrode rod 3, and then exited from the contact tip 4. This is what is sent to. However, the electrode rod 3 and the feeding power cable 2 are connected by a flexible conductive cable 5. The reason why a flexible conductive cable is used here is that when the tenon-straight electrode rod 3 is vibrated using the swivel bearing 6 as a fulcrum to give vibration to the tip of the electrode, the connecting end of the flexible conductive cable also uses the bearing 6 as a fulcrum. Since it swings as if it were a ball, it has the role of absorbing the swing caused by the vibration of the shaft. Of course, as a semi-automatic welding torch, if there is no functional problem, the electrode rod 3 may be purchased as one unit and connected to the power cable without connecting with the flexible conductive cable 5. In this case, the vibration applied to the tip of the electrode is applied via a swivel bearing 7 that fixedly holds the electrode rod 3, and an electrode drive plate 8 is fixed to the bearing. The electrode driving plate 8 has a function of mediating eccentric vibration generated from a vibration source, and the source of the vibration is within the handle portion 9. A motor 10 and the like as a vibration source are housed within the handle portion. A bevel gear 11 is connected to the motor as one of the rotation transmission mechanisms.

The bevel gear meshes with the driven bevel gear 12. Further, the bevel gear 12 is provided with a flange 13, and an eccentricity adjustment coupling 14 is provided on the flange portion.
A rotation fixing pin 15 is provided which can be rotated. The eccentricity of the eccentricity adjusting coupling 14 is adjusted by an eccentric pin 17 coupled to an eccentricity adjusting shaft 16.

That is, the amount of eccentricity is adjusted by moving the eccentric pin 17 to the left or right in the figure within the eccentric pin slide groove 18 provided in the eccentric amount adjustment coupling 14. In this case, the eccentricity adjustment shaft 16 and the free bearing 19
The amount of eccentricity becomes zero when the center axis of the eccentric shaft bearing 20 attached to the tip of the eccentricity adjustment coupling 14 held by the shaft is aligned. When the eccentric pin 17 moves to the left or right, the eccentric amount adjusting coupling 14 moves the sliding hole 21 in the vertical direction in the figure using the swivel bearing 19 as a fulcrum. When this point moves up and down, the axis line shifts, so when the eccentric amount adjusting coupling 14 rotates in this state, the center of the eccentric shaft bearing 20 makes a rotational circular motion. Here, the eccentric pin 17 is attached to the end of the eccentricity adjusting shaft 16, and the eccentricity adjusting shaft 16 engages with the eccentricity adjustable couple 22.

The coupling is manufactured so that the eccentricity adjusting shaft 16 can be rotated freely, but it is a mechanism that engages tightly in the left and right directions in the figure. Therefore, by rotating the eccentric adjustment knob 23 and rotating the eccentric adjustment screw portion 24, the eccentric pin 17 is rotated.
is adjusted to the left or right in the figure to obtain a desired amount of eccentricity. Eccentric shaft bearing 2 obtained in this way
The eccentric rotation of 0 is transmitted to the vibration transmission plate 25 through a vertically long shaft hole 34 provided in the vibration transmission plate 25. The transmission plate 25 is provided with two pin holes into which connecting pins 26 and 27 are fitted. The connecting pins 26 and 27 are fixed to the electrode 1 drive plate 8 which is fixed to the swivel bearing 7 that holds the electrode. Although it has been shown that the eccentric shaft bearing 20 is fitted to the vibration transmission plate 25 through a vertically elongated shaft hole, this part of the electrode drive plate 8 (not shown) is a fairly large loose hole that connects the eccentric shaft. It is purchased so that the bearing 20 passes through it. A guide hole 29 is provided below the vibration transmission plate, through which a vibration plate guide bearing pin 28 passes, in order to cause the transmission plate to perform a linear or angular movement through an eccentric shaft bearing. In addition, the diaphragm guide bearing pin 28
is fixed to a fixed plate 30 that does not swing at all. To explain the vibration situation at the electrode tip in this torch example,
When the eccentric shaft bearing 20 rotates eccentrically, the amount of eccentricity is transmitted to the vibration plate through the shaft hole 34 of the vibration transmission plate.

However, since the shaft hole 34 provided in the transmission plate 25 is a vertically elongated hole, the amount of eccentricity is determined by the movement of the bearing 20 in the elongated hole in the same vertical direction as the longitudinal direction of the handle, and the power from the vibration source is Not reached. On the other hand, in the direction perpendicular to the longitudinal direction of the handle, the width of the groove of the shaft hole 34 is almost the same as the outer diameter of the bearing 20, and the bearing 20 fits without any gap, so the amount of eccentricity can be directly stated. Become. The transmission plate 25 makes a linear or angular movement using the guide hole 29 as a fulcrum,
The eccentric movement is transmitted to the electrode driving plate 8 via the connecting pins 26 and 27, and the electrode tip makes a rectilinear reciprocating motion with an amplitude W. Note that FIG. 1 shows a GMA welding torch in which a shield gas pipe 31 is provided in the torch body, gas flows through the body from a gas inlet 32, and gas is discharged from a shield gas nozzle 33. There is.

This gas path is used for TIG welding, but
Needless to say, this is unnecessary in the case of submerged arc welding or non-gas encapsulated arc welding.

The torch of the present invention is a semi-automatic welding torch that has a vibration source inside the handle and has the function of drawing arbitrary shapes on the tip of the L electrode to obtain a welded part of stable quality. Removable vibration transmission plate 25 as equipment purchase
Its greatest feature is that it uses . That is, FIG. 2 shows the shape of a typical vibrating transmission board.

When applied to the torch example shown in FIG. 1, FIG. 2a shows a circular shape at the tip of the electrode. Connecting pin holes 35 and 36 are provided to be fixed with connecting pins 26 and 27 provided for connecting with the plate 8. In addition,
A guide hole 29 is provided at one end of the transmission plate 25 . This vibration transmission plate is provided with an eccentric shaft bearing 20, and when rotated by an eccentric amount, the vibration transmission plate moves up and down at the position of the guide hole 29, and transmits a circular motion to the electrode drive plate 8. It is something that Similarly, in FIG. 2b, the shaft hole 34 is a horizontally elongated hole, so even if the eccentric shaft bearing rotates by a certain amount of eccentricity, the power from the vibration source is not transmitted in the direction of the elongated hole; Since power is transmitted in the direction, electrode 1
The drive plate 8 only moves up and down, and if it is applied to the torch shown in FIG. This is exactly a 9σ conversion from the reciprocating motion in the example. FIG. 2c shows a vibrating board for an application example of the torch shown in FIG. 1, and as mentioned earlier, it shows the reciprocating figure of the electrode in the right angle direction crossing the longitudinal direction of the handle part 9. . By preparing various lengths and angles of the long hole of the shaft hole 34 provided in the vibration spreading plate 25, and arbitrarily selecting an appropriate one from among them, the shape shown in FIG. A nearly straight line figure can be obtained by reciprocating at any angle with respect to the longitudinal direction of the handle portion 9. The welding torch of the present invention has been illustrated and explained in terms of the consumable electrode type, but if the machine groove of the present invention is used as is and the electrode part is replaced with one for TIG or plasma welding, other methods can be used. Needless to say, it is also fully applicable to welding in the form of.

The torch of the present invention is a semi-automatic arc welding torch that has never been seen before, and can form an arc locus of any shape at the tip of the electrode, so the function is different from the conventional manual weeping, and the vibration pattern is stable. Therefore, the welder can simply operate the entire torch in a straight line at the target welding location, and weld while sweeping the arc point arbitrarily. These effects make it possible to perform weeping welding without the need for experienced welding technicians, which was required in the past.Furthermore, all-position welding can be performed stably, making it possible to improve workability and quality.6It has great industrial value. There is something big.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the torch of the present invention. FIGS. 2A, 2B, and 2C are diagrams showing several embodiments of the vibration transmission plate applied to the torch of the present invention. In the figure, 1 is an electrode, 2 is a power supply cable, 3 is an electrode rod, 4 is a contact chip, 5 is a flexible conductive cable, and 6
1 is a swivel bearing, 8 is an electrode drive plate, 9 is a handle portion, 10 is a vibration source motor, 11 and 12 are pebble gears, 13 is a gear flange, 14 is an eccentricity adjustment coupling, 15 is a rotation fixed pin, and 16 is an eccentricity adjustment Shaft, 17 is an eccentric pin, 18 is an eccentric pin slide groove, 19 is a universal bearing, 20 is an eccentric shaft bearing, 21 is a pin sliding hole, 22 is a coupling that can freely adjust the amount of eccentricity, 23 is an eccentric amount adjustment knob, 24 is an eccentric Adjustment screw, 25 is a vibration transmission plate, 26, 27 is a connecting pin, 28
is a diaphragm guide bearing pin, 29 is a guide hole, 30 is a fixed plate, 31 is a shield gas pipe, 32 is a gas inlet, 33
is a shield gas nozzle, 34 is a shaft hole, and 35 and 36 are connecting pin holes.

Claims (1)

[Claims] 1. A rotary motor for vibrating the welding electrode is provided inside the torch handle, and an eccentric shaft equipped with an eccentric amount adjustment section is connected to the rotary motor via a rotation transmission gear, and the rotary shaft is held by the eccentric shaft and a flexible bearing section. A semi-automatic welding torch, characterized in that a removable vibration transmission plate is connected to the electrode.