JPS6146377A - Torch cleaning device for welding robot - Google Patents

Abstract

PURPOSE:To obtain a titled device that ensures removal of spatter by fixing a torch nozzle at high accuracy by a link mechanism clamp that augments pressing force of a spring with rotation and ascent of a scraper, and bringing the diameter of scraper rotation close to the diameter of inner wall face of the torch. CONSTITUTION:With ascent of a rotary scraper 12, driven by a motor 24, by a reversible motor 42 and a rack 36 pinion 38 mechanism, an operation rod 56 pushed in by a chain 84 is released the torch nozzle 18 is fixed at high accuracy by pressing force of a coil spring 68 and thrusting of a pad 70 at the tip of a step-up link mechanism 54 against fixing pad 72. The rotary scraper 12 goes up further, and cleans the inner wall face of the torch nozzle 18. As the core of the scraper 12 coincides with the core of inner wall face of the nozzle 18, it is possible to bring the diameter of rotation of the scraper 12 as near as possible to the diameter of inner wall face of the nozzle 18. Thus, cleaning is made sure furthermore.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cleaning device for a torch for a welding robot, and more particularly to an improvement in the cleaning device for removing spatter adhering to the inner wall of a nozzle of a torch.

[Prior art]

Generally, when welding is performed by arc welding, spatter formed by slag and metal particles scattered during welding adheres to the inner peripheral wall of the nozzle at the tip of the welding torch, making it impossible to obtain a stable arc. Conventionally, a cleaning device equipped with a scraper is used to remove the spatter adhering to the inner wall of the nozzle, and the scraper is inserted into the inner wall of the nozzle and rotated to remove the spatter.

[Problem that the invention seeks to solve]

By the way, the positioning accuracy of the torches of welding robots varies considerably. Therefore, when performing cleaning work by positioning and stopping the torch due to the positioning accuracy unique to the welding robot, the positioning accuracy of the torch must be taken into account when adjusting the scraper. The rotational diameter had to be made smaller in advance (about 4 to 6 degrees smaller) than the nozzle inner chest wall diameter. (If the stop position of the torch shifts, the scraper cannot be inserted into the nozzle if the rotational diameter of the scraper and the diameter of the inner circumferential wall of the nozzle are almost the same.) For this reason, with conventional cleaning devices, the inner circumferential wall of the nozzle Since the scraper cannot be placed as close as possible, a lot of spatter is left behind, and when welding is performed again, the spatter during welding adheres to the spatter left behind, making it easier for the spatter to grow. There was a point. In addition, the torch of a welding robot must be easily moved according to the welding location, so it is easy to increase the weight and make it a stronger structure, so the cleaning force of the scraper nozzle cannot be increased too much. For this reason, there is a problem in that when spatter grows to a large extent on the inner circumferential wall of the nozzle, the nozzle cannot be cleaned using a scraper with a small cleaning force.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention constitutes a torch cleaning device in which a clamping means for fixing the torch of a welding robot during cleaning is arranged.

[Effect]

In the above-described torch cleaning device, the torch is fixed by a clamping means during cleaning to improve the positioning accuracy of the welding robot torch.

〔Example〕

Hereinafter, one embodiment of the torch cleaning device according to the present invention will be described in detail.

1 to 3 are a front view and a side view, respectively, of a welding robot torch cleaning device 10 according to the present invention.

and a top view.

This welding robot torch cleaning device (hereinafter simply referred to as the cleaning device) 10 supports a scraper 12 constituted by a pair of plates arranged opposite each other, and cleans while rotating the scraper 12 in a horizontal direction. equipped f11
a slide portion 14 that moves in the vertical direction (arrow A) of 0;
It consists of a drive section 16 that moves this slide section 14 up and down, and a clamp means that holds a torch nozzle 18 of a welding robot (not shown) positioned above the scraper 12. Further, the slide portion 14 is
It consists of a shaft n that supports the scraper 12, a motor that rotates the shaft 4, and a slide member that moves the motor 24 and the shaft n together in the vertical direction of the device 10. As shown in FIG. 2, the guide bars 32 and 34 are disposed across between the plate row in which the clamp means are arranged and the plate 30 that supports the drive section 16, and the guide bars 32 and 34 have both ends 26a.

26b is inserted. On the other hand, as shown in FIG. 1, a rack is disposed at the rear of the slide member of the slide portion 14 and extends below the apparatus 10.

Also, a pinion gear meshes with this rack, and this pinion gear is connected to a motor 42 arranged at the rear of the drive section 16 via a shaft 40. Therefore, drive unit 1
When the motor 42 of No. 6 rotates forward or reverse, the rack 36 moves up and down via the pinion 38.
The sliding member of the sliding part 14 fixed to the scraper 1 also moves up and down along the guide bars 32 and 34.
2 is brought into contact with and separated from the torch nozzle 18. Also,
The plate door is provided between the plate 30 that supports the drive section 16 and the plate 2B in which the clamping means is arranged.

Supports 44 and 46 (first
and FIG. 3) are arranged. Further, in FIGS. 1 and 2, the reference numeral 1 is a column that supports the entire device 10. As shown in FIG.

On the other hand, as shown in the top view of FIG. 3, a clamping means is disposed on the plate 28.

This clamping means includes an arm 52 rotatably supported in front of the plate 28 by an axial force, and an arm 52 that is rotatably supported in front of the plate 28.
It consists of an operating rod 56 connected via a second link mechanism 54, and this operating rod 56 is connected to a bearing 5 formed in the plate row.
8, 60. The link mechanism is constituted by an arm 62 that connects the rear end 52b of the arm 52 and the tip 56a of the operating rod 56, and this arm 62 is connected to the rear end of the arm 52 by a shaft 64°66. It is supported by the end 52b and the tip 56a of the operating rod 56. On the other hand, the large diameter portion 56 of the operating rod 56
A coil spring 68 is disposed between B and the bearing 58, and the elastic force of the coil spring 68 constantly urges the operating rod 56 toward the rear of the plate, that is, in the direction of arrow B. Furthermore, pads 70 and 72 for gripping the torch nozzle 18 are arranged at the tip 52a of the arm 52 and at the notch 28a formed at the tip of the plate path, respectively. Further, a pressing means 74 is disposed at the rear end 56c of the operating rod 56 for pressing the operating rod 56 in the opposite direction against the pressing force of the coil spring 68 in the direction of arrow B. In FIG. 3, this pressing means 74 causes the coil spring 68 to
The operation rod 56 is pressed against the elastic force of the clamping means φ
The operating rod 56 is normally moved in the direction of arrow B by the elastic force of the coil spring 68, and the pads 70 and 72 are expanded as shown by the dashed line. It's blocking the gap. On the other hand, the pressing means 74 includes nuts 76, 7, as shown in FIG.
1 fixed to the rear end 56C of the operating rod 56 by 8.
A chain link connects a letter-shaped pressing member 80, a bar 82 fixed to the lower end of this pressing member 80 with a nut 81, and a tip 82a of this bar 82 and the sliding member on which the sliding portion 14 is arranged. The chain 84 is bent into an L-shape and stretched by an idle sprocket 86 interposed therebetween. In addition, Jin's idle sprocket 86
is rotatably supported by a plate 88 attached to the lower surface of the plate 2B on which the clamp means is arranged.

Next, the operation of the cleaning device 1110 described above will be explained, and the configuration will also be explained in more detail.

When the torch 18 of the welding robot (not shown) is positioned and stopped between the pads 70 and 72 of the clamping means (9) as shown in FIG. 3, the cleaning operation begins as shown in FIG.
l The motor 42 of the drive unit 16 of the cleaning device 10 in the standby state rotates, and the pinion and rack a cause
The slide portion 14 moves upward along a guide bar 34. On the other hand, when the motor 42 of the moving part 16 rotates, the motor of the slide part 14 also rotates at the same time, causing the scraper 12 to rotate. Also, when the slide portion 14 moves upward,
The chain 8 connecting the slide member of the slide portion 14 and the bar 82 of the pressing means 74 is relaxed, and therefore,
As shown in FIG. 83, the operating rod 56 is moved in the direction of arrow B by the elastic force of the coil spring 68 of the clamping means. When the operating rod 56 moves in the direction of arrow B, the link mechanism U rotates the end arm 52 to clamp the torch nozzle 18 between the pads 70 and 72. on the other hand.

After the torch nozzle 1B is clamped by the clamping means, the scraper 12 is further moved upward by a predetermined distance while being rotated by the drive section 16 and the slide section 14, as shown in the enlarged cross-sectional view of the main part in FIG. It is inserted into the inner peripheral wall 18a of the torch nozzle 18. Note that since the rotation diameter l of this scraper 12 is slightly smaller than the diameter of the inner circumferential wall of the torch 18 (0<L-1<0.5 m), spatter attached to the inner circumferential wall 18a of the torch 18 is removed. (not shown) will be removed from the immediate vicinity of the attached portion. Note that when the scraper 12 is inserted into the inner circumferential wall 18H of the torch nozzle 18 for a predetermined length and the spatter removal operation is completed, the motor 42 of the drive section 16 is reversely rotated and the slide section 14 is lowered. Further, when the slide portion 14 descends, the slide member causes the operating rod 56 of the clamping means to move backward against the elastic force of the coil spring 68, thereby releasing the clamp on the torch 18. Note that the slide section 14 and the drive section 16
When the slide portion 14 descends by a predetermined distance, each motor stops at that position and becomes ready for cleaning the torch 18 again. In FIG. 4, the symbol ■ is an orifice, 92 is a tip, and 94 is a welding wire.

〔Effect of the invention〕

The present invention comprises a torch cleaning device equipped with a clamping means for positioning and fixing the torch of a welding robot.
Since the torch nozzle can be positioned and fixed with high precision without depending on the positioning accuracy inherent to the welding robot, the scraper rotation diameter of the cleaning device is placed as close as possible to the inner circumferential wall diameter of the torch nozzle, and the Spatter adhering to the inner circumferential wall of the torch nozzle can be more reliably removed.

[Brief explanation of drawings]

1 to 3 are a front view and a side view, respectively, showing a torch cleaning device for a welding robot according to the present invention. and a top view, and FIG. 4 is a sectional view of the main part of the torch nozzle. 10... Torch cleaning device for welding robot, 12...
Scraper, 18...torch nozzle, processing...clamping means, 52...arm, 54...link mechanism, 5
6... Operating rod, 68... Coil spring, 74...
...Press means.

Claims (2)

[Claims] (1) Cleaning the nozzle of the welding robot torch in a welding robot torch cleaning device in which a rotating scraper is inserted into the nozzle inner peripheral wall of the welding robot torch to remove spatter adhering to the inner peripheral wall. 1. A torch cleaning device for a welding robot, comprising a clamping means for positioning and fixing the nozzle when cleaning the nozzle. (2) The clamp means includes an arm that grips and releases the nozzle, an operating rod connected to the arm via a link mechanism, a coil spring that constantly presses the operating rod in a direction to grip the nozzle, and the arm that grips and releases the nozzle. The torch cleaning device for a welding robot according to claim 1, characterized in that the device is a pressing means for pressing an operating rod in a direction to release the grip of the nozzle.