JPH0214865Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to the improvement of a welding torch oscillation device, and in particular to the vertical weaving mechanism of the torch in automatic welding equipment for TIG welding and the vertical movement of the torch by arc length control. The mechanism is configured to be operated reliably by a drive device that has a compact structure, to keep the weaving speed constant, and to easily change the weaving width.

[Prior Art] An automatic welding device for TIG welding may require a weaving mechanism for swinging the torch and a lifting/lowering means for moving in the axial direction of the torch shaft to adjust the arc. Various types of drive means and devices have already been proposed. However, these devices have drawbacks such as not being reliable in operation, being inconvenient to handle, and increasing the size of the device, which increases the burden on the truck. For this reason, the applicant has developed an oscillation device that can be constructed compactly, is easy to drive, and can be used stably over a long period of time, and has previously filed a patent application. (Special Application No. 55-47422). This oscillation device is
A movable housing that holds a torch reciprocates in a direction perpendicular to the axial direction of the torch, and the movable housing is attached to the tip of a sliding shaft that protrudes from a drive housing that has a built-in drive device. The torch, which is configured to be attached and held in the movable housing, is attached to a sliding member that is slidably inserted loosely into a slide shaft that is arranged parallel to the axial direction of the torch, and this sliding member is It is constructed so that it can be moved up and down via a spline shaft device that is provided within the drive housing and extends telescopically from the drive device, and has the advantage of being extremely easy to handle. However, the driving of the sliding shaft for reciprocating the movable housing is
This is carried out by a swinging lever, and the swinging lever engages a crank ball that rotates at one end at a constant speed and a fixed amount of eccentricity, and a fulcrum ball that supports the central part of the lever. The lever is pivoted, and the sliding shaft is connected to a moving member pivotally supported on the other end of the lever so as to slide. Further, the sliding range of the sliding shaft, that is, the oscillating width is controlled by changing the position of the fulcrum ball. Therefore, the swing lever swings back and forth at a constant speed, and when changing the oscillation width simply by changing the position of the fulcrum ball, the movement speed increases as the oscillation width increases, and conversely, when the width becomes narrower, the oscillation speed increases. Movement speed tends to be slower. Therefore, for example, if the oscillation rate width is 4 mm and the torch moving speed is 2 m/min, the oscillation rate width is
When set to 24mm, the torch movement speed is 6 times 12m/
In order to avoid the need to change the moving speed of the torch, it is necessary to change the rotational speed of the rotating crank ball at the same time as adjusting the oscillator width. However, in order to do this, the motor for rotating the crank ball must have a large capacity and be equipped with a speed governor. In view of the above, if a part of the small oscillation device proposed by the present applicant as mentioned above is improved so that a constant torch movement speed can be obtained even when the oscillation width is changed, it would be possible to It is thought that the versatility of the device can be further improved.

[Problems to be solved by the invention] The present invention was made with attention to these points, and it is designed to be small and lightweight, and the torch is installed on a sliding member that is moved up and down by loosely inserting it into a slide shaft provided in a movable housing. The movable casing is provided on a sliding shaft protruding from a driving casing in which a driving device is built in, and the movable casing is moved reciprocatingly.The means for lifting and lowering the sliding member is based on the one according to the above patent application. It is an object of the present invention to provide an oscillating device that can obtain a constant torch moving speed even when the oscillating lever portion is improved and the oscillating width is changed.

[Means for Solving the Problems] However, the present invention as a lever is such that the other end of the sliding shaft extends inside the drive housing, a rack is provided at the other end,
A drive shaft pinion is engaged with the rack, and the sliding shaft is slid by the rotation of the drive shaft pinion, and limit switches for changing the rotation of the drive shaft pinion are respectively driven to restrict both ends of the sliding range. A striker that is fixedly disposed within the housing and that operates the limit switch is screwed onto each of the screw shafts having reverse threads on the left and right sides, and
The screw shafts are also slidably attached to support seats connected to the sliding shafts, and the screw shafts are connected to the sliding shafts, and the screw shafts are connected to the housing through spline joints provided inside the drive housing. The gist of this is that it has a configuration that can be rotated from outside the body.

[Operations and Examples] The present invention will be described in detail below based on the drawings. However, the drawings show an example of a specific implementation of the present invention, and the present invention is not limited to these illustrated examples.
The present invention can be implemented in the same way even if the shape of the component parts is changed or a part of the design is changed in accordance with the purpose described later. FIG. , FIG. 2 is a side view of the lower side of FIG. 1, FIG. 3 is a side sectional view taken along the cutting line - of FIG. 1, FIG. 4 is a sectional view taken along the cutting line - of FIG. 3, and FIG. The figure is an enlarged explanatory view showing the direction of the arrow along the cutting line - in FIG. 3. In these figures, the oscillating device of the present invention is composed of a drive housing 1 and a movable housing 2, and the drive housing 1 is attached to a welding cart or a welding head device. On the other hand, the movable housing 2 is attached to the tips of sliding shafts 3, 3a that protrude from the drive housing 1 and slide.
Book slide shafts 5, 5a are attached.
A sliding member 6 is loosely inserted into the slide shafts 5, 5a, and the torch is attached to the torch mounting body 4.
It is attached to the sliding member 6 via. On the other hand, the movement of the sliding member 6 is carried out by the rotation of a rack member 9 fixed to the member 6 and a pinion 15 that engages with it. It is driven by the motor 8 in the direction of arrows z ₁ -z ₂ . By the way, the movable housing 2 has sliding shafts 3, 3.
Since the pinion 15 is moved in the direction of arrows x ₁ -x ₂ by a, the pinion 15 and the lifting motor 8 are connected via a telescopic spline shaft device 10. That is, as shown in FIG. 3, the spline shaft device 10 has an output shaft fitting body 12 on the motor side inserted into a spline bearing 11 loosely supported on a support wall, and a spline shaft 13 on the other end of the bearing 11. The pinion 15 is fixed to the other end of the spline shaft 13. 14 is a shaft that supports the pinion 15. Note that 16 is a dustproof bellows membrane.

On the other hand, sliding of the sliding shafts 3 and 3a is performed by a weaving motor 7, and the amount of reciprocating movement thereof is configured so as to be freely changeable from the outside of the drive casing 1, and the amount of movement is The moving speed is configured to remain constant even if the speed is changed. That is, the sliding shafts 3 and 3a are loosely inserted into boss portions 1b and 1b that are integrally formed in a part of the drive housing 1, respectively, and there is a connection on the rear end side that connects both sliding shafts. The material 20 is attached. The sliding shaft 3a is driven from the sliding shaft 3 via the connecting member 20,
The sliding shaft 3 is driven by a rack tooth 21 formed on a part of the shaft. Therefore, the sliding shaft 3 side is formed long and protrudes rearward from the connecting member 20, and the rack teeth 21 are carved on the lower surface side of the protruding portion.
Note that the rack teeth 21 may be constructed by attaching a rack rod made of another material to the sliding shaft 3. The pinion 19 that engages with the rack teeth 21 is fixed to one end of a drive shaft 18a that is loosely supported by a bracket 17 that is fixed in the drive housing 1, and the drive shaft 18a is connected to a weaving motor. 7 directly or by driving the miter gear 18 through the clutch device 17a. By the way, the sliding shaft 3 reciprocates, and the amount of this reciprocating movement (weaving width) needs to be adjusted. Therefore, in the device of this invention,
The rotation direction and rotation duration of the weaving motor 7 are changed by switching the power source for driving the motor or by switching the clutch device 17a. That is, the support arm 24 is disposed within the drive housing 1 so as to be substantially parallel to the movement locus of the connecting member 20.
, and limit switches 22 and 23 are attached to both sides of the support arm 24 (see FIG. 3). Further, the connecting member 20 has a supporting seat 2 parallel to the supporting arm 24.
8 is attached, and two strikers 25 and 26 are slidably provided on the support seat 28 in a line. The support seat 28 is formed with a dovetail-shaped sliding groove 28A as shown in FIG. Configure to be flexible. Note that these support seats 28 may be constructed of a plurality of slide shafts or other suitable sliding devices. On the other hand, each of the strikers 25 and 26 has a screw hole formed therein to form a screw shaft 27, and the screw shaft 27 is a double screw with opposite threads on the left and right sides with the almost center as the boundary, as shown in FIG. The axis. Therefore, when the screw shaft 27 is turned to one side, the strikers 25 and 26 are brought closer to each other, and when the screw shaft 27 is turned to the opposite side, the strikers 25 and 26 are moved away from each other. As shown in FIG. 5, the screw shaft 27 is loosely supported at one end (the left end in the figure) by the connecting member 20, and the loose support means only allows the screw shaft 27 to rotate, but cannot move in the axial direction. Regulated. Therefore, the strikers 25, 26 and the screw shaft 27 slide integrally with the sliding shaft 3, and this sliding movement is the same as the oscillator width. The other end of the screw shaft 27 is provided with a spline joint 29 as shown in FIG. 3, and a spline cylinder shaft 30 in the spline joint 29 is pivotally supported by a mounting member 35. That is, a pivot hole is formed in a part of the wall surface of the housing, and the spline cylinder shaft 30 is rotatably supported by the hole and the mounting member 35. Inside the spline cylindrical shaft 30 is a spline shaft 29 which can move freely in the axial direction of the cylindrical shaft and only transmits rotation.
a is inserted and the other end of the screw shaft 27 is connected to the spline shaft 29a. Therefore, during oscillation, the spline shaft 29a slides within the spline cylinder shaft 30. Further, as long as the cylinder shaft 30 is not rotated, the strikers 25 and 26 remain at a constant interval position.

On the other hand, the limit switches 22 and 23 are provided adjacent to the strikers 25 and 26.
The figure shows a micro switch as an example of a limit switch, and its operating contacts 23a and 22a are provided in contact with parts of strikers 26 and 25, respectively (FIG. 5). These limit switches 22 and 23 are configured to operate a rotation switching control switch of the weaving motor 7 or a clutch switching electromagnetic device of the clutch device 17a,
While one side is sensitive, the other side is insensitive.

Therefore, for example, in FIG. 5, if the connecting member 20 moves to the left and this movement is performed by the switch 23 and the striker 26, the end 26a of the striker 26 reaches the switch 23 and the switch 23 is activated. Then, as described above, at the same time as changing the driving direction, the switch 22 is brought into the sensitive state. This now moves to the right and the switch 22 reaches the end of the striker 25 and is switched again as described above. Therefore, in the illustrated example, the interval between both ends 25a, 26a of the strikers 25, 26 is the oscillating width. By rotating the screw shaft 27, this oscillating width can be freely changed.

On the other hand, in order to change the oscillation width, as shown in FIG.
1 is fixedly installed, and the handle gear 32 loosely supported by the mounting member 35 is engaged. A portion of the handle gear 32 protrudes outside the drive housing 1 so that the screw shaft 27 can be rotated manually. Reference numeral 33 (FIG. 1) is a sign board indicating the oscillation width and the operation of the handle gear 32.
Further, 34 (shown in FIG. 2) indicates a power supply outlet.

[Effect of the invention] In the oscillating device of the present invention constructed in this way, the sliding shaft 3 is moved by a rack and a pinion, so even if the oscillating width is changed, a constant speed can be maintained at all times, resulting in good welding. I can do it. In addition, it can be constructed in a small size, easy to handle, and can be used stably at the end.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view of an oscillation device to which the present invention is applied, Fig. 2 is a bottom side view of Fig. 1, Fig. 3 is a side sectional view taken along the cutting line - of Fig. 1, and Fig. 4 3 is a sectional view taken along the cutting line - in FIG. 3, and FIG. 5 is an enlarged sectional view taken along the cutting line - in FIG. 3 in the direction of the arrow. 1... Drive case, 2... Moving case, 3... Sliding shaft, 6
...Sliding member, 7... Weaving motor, 8... Lifting motor, 9... Rack member, 10... Spline bearing device, 12... Fitting body, 13... Spline shaft,
20... Connecting member, 21... Rack tooth, 24... Support arm,
25, 26... Striker, 27... Screw shaft,
28...Support seat, 29...Spline shaft, 30...Spline cylinder shaft, 33...Sign plate.

Claims (1)

[Scope of utility model registration request] A movable housing that reciprocates in a direction perpendicular to the axial direction of a welding torch to be held is attached to one end of a sliding shaft protruding from a drive housing in which a drive device is built, and the welding torch is slid. The sliding member is fixed to the member, and the sliding member is loosely inserted into a slide shaft fixed in parallel to the axial direction of the welding torch within the movable housing,
In the welding torch oscillating device, the pinion that engages with the rack member attached to the sliding member is connected to the motor in the drive housing via a spline shaft and a spline bearing, and the other end of the sliding shaft is driven. A rack is provided at the other end of the rack, and a drive shaft pinion is engaged with the rack, and the sliding shaft is slid by the rotation of the drive shaft pinion. Limit switches for changing the rotation of the drive shaft pinion that regulate both ends of the movement range are fixedly disposed within the respective drive housings, and strikers for operating the limit switches are screwed onto each of the screw shafts having reverse threads formed on the left and right sides. The screw shaft is also connected to the sliding shaft, and the screw shaft is connected to the sliding shaft via a spline joint provided in the drive housing. An oscillating device for a welding torch, characterized in that the device is configured to be able to rotate from outside the casing.