JP5123066B2 - Electrode tip removal device for welding - Google Patents

Description

  The present invention relates to an apparatus for removing a welding electrode tip taper-fitted to a shank from the shank.

  2. Description of the Related Art Conventionally, an apparatus for removing a welding electrode tip taper-fitted to a shank from the shank, which contacts the end surface of the shank and the end surface of the electrode tip by a gap between the large diameter portion of the shank and the electrode tip. A device for removing a chip tip from a shank by disposing a tip extraction plate having a substantially semicircular nail in contact with the tip of the removal device and pressing the end surface of the electrode tip in the axial direction of the electrode tip with the nail (For example, see Patent Documents 1 and 2).

Japanese Patent Laying-Open No. 2005-40830. Japanese Patent No. 3892816.

  By the way, in the apparatus as described in Patent Document 1 of the prior art, in order to widen the interval between the two extraction plates stacked in order to extract the electrode tip by the nail of the chip extraction plate, the wedge and the power for operating the wedge However, such a power system requires power and air wiring and piping to operate the device, which is inconvenient for installation and operation, and is a device for generating power. (Air cylinders, geared motors, control devices, etc.) are expensive, and the price of the removal device may be expensive.

  In addition, in the apparatus as described in Patent Document 2, the operation lever is used to widen the interval between the two extraction plates by the rotation arm, but in this case, the operation of operating the operation lever is performed. It requires personnel skill and excessive labor, and labor saving and complete automation are not possible.

  The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to make the electrode chip removal device powerless so that the electrode chip can be pulled out and a reliable chip. It is an object of the present invention to provide a welding electrode tip detaching apparatus capable of extracting and completely automating the apparatus.

  In order to achieve the above object, a welding electrode tip removal apparatus according to the present invention is a device for removing a welding electrode tip taper-fitted to a shank from the shank, wherein the large-diameter portion of the shank A tip extraction plate having a substantially semicircular claw that is in contact with the end face of the shank and the end face of the electrode tip in the gap between the electrode tip and the electrode tip is disposed on the distal end side of the removal device, and the end face of the electrode tip is In the device for removing the electrode tip from the shank by pressurizing in the axial direction of the electrode tip, the tip extraction plate is slidably stacked up and down on a column erected on the base plate, and both tip extraction plates are inserted. A spring wound around the support is brought into contact with one outer surface of the base plate, and the chip extraction plate is pivoted on the side surface of the base plate. It is arranged on the leading end side, and pins are provided in the front and rear direction on the free end side of the swing arm, and a groove for moving the pin is formed on the side surface of each chip extraction plate. And the chip extracting plate is connected by inserting the pin into the moving groove.

  Further, a swing arm stopper is provided between the pivot point of the swing arm and the pin on the free end side.

  In addition, chip extraction plates stacked in a vertically slidable manner on support posts erected on the base plate are arranged on the upper plate side and the lower plate side of the base plate, respectively. It is.

  In the present invention, the extraction plate is slidably stacked up and down on a column erected on the base plate, and a spring wound around the column is brought into contact with one outer surface of both extraction plates, The extraction plate is arranged on the free end side of a swinging arm pivoted on the side surface of the base plate, and a pin projecting forward and backward on the free end side of the swinging arm is connected to the extraction plate. Since the electrode tip attached to the shank is removed by moving the welding gun shank with respect to the extraction plate, the welding electrode tip is removed. It becomes a device for removing the electrode tip for welding, which makes the device non-powered and can stably and reliably extract the tip and fully automate the device.

  If a swing arm stopper is provided between the pivot point of the swing arm and the pin on the free end, the swing arm is excessively removed during the welding electrode tip removal operation. Since the extraction plate can operate more accurately without causing the spring to be damaged due to excessive vertical sliding of the extraction plate due to rocking, it becomes a welding electrode tip removal device that can also quickly remove the electrode tip. .

  In addition, in the case where the chip extraction plates stacked in a vertically slidable manner on the pillars erected on the base plate are respectively arranged on the upper plate side and the lower plate side of the base plate, Depending on the orientation of the gun, it is possible to reverse the direction of the gun or to remove the tip by using a set of tip extraction plates on the upper plate side or a set of tip extraction plates on the lower plate side. It becomes a welding electrode tip detaching apparatus that can extract the electrode tip from the shank without reversing itself.

  The extraction plate is slidably inserted vertically into the column that is erected on the base plate, the spring wound around the column is brought into contact with one outer surface of both chip extraction plates, and the extraction plate is The pin is disposed on the free end side of the swing arm pivoted on the side surface of the base plate, and a pin projecting forward and backward on the free end side of the swing arm is formed on the side surface of the extraction plate. A state where the welding gun with the electrode tip to be removed is moved by inserting it into the groove for moving the pin and is positioned so that both claws of the extraction plate fit in the gap between the electrode tip and the shank Further, by the movement of the welding gun, the swinging arm is rotated about the pivot, and the electrode tip is automatically extracted from the shank with the space between the two extraction plates widened.

  Then, the welding gun with the electrode tip to be extracted is moved so that both claws are placed in the gap between the electrode tip and the shank, the electrode tip is extracted, and welding is performed after the electrode tip is extracted. The welding gun movement control until the gun is removed from the electrode tip removal device can be fully automated by teaching the robot control mechanism and controlling it with the robot control. .

  1 to 4 relate to a welding electrode tip detaching apparatus according to a first embodiment of the present invention. FIG. 1 is a plan view of a main part, FIG. 2 is a front view thereof, and FIG. Sectional drawing and FIG. 4 are the operation | movement explanatory drawings.

  In the figure, reference numeral 1 denotes the whole appearance of a welding electrode tip removal device. The base plate of the welding electrode tip removal device 1 is composed of an upper plate 2, a lower plate 3 and side plates 4, and has a cross section. It is formed in a U shape.

  Reference numeral 5 denotes a chip extraction plate having a substantially semicircular claw 6 at its tip, and 7 a substantially semicircular claw 8 at its tip. The chip extraction plate 5 has a hole 9 in the rear part of the claw 6. However, a hole 10 is formed in the rear part of the claw 8 in the chip extraction plate 7, and pin movement grooves 11, 11 are formed on the chip extraction plate 5 downward on the side surface of the chip extraction plate 7. On the side surfaces, pin movement grooves 12 and 12 are respectively formed on the upper side.

Reference numeral 13 denotes a column which is erected between the upper plate 2 and the lower plate 3 constituting the base plate. The column 13 and the chip extraction plates 5 and 7 are inserted into the column 13 through holes 9 and 10, respectively. It is inserted so that it can slide up and down. Further, a spring 14 is wound around the column 13 between the lower outer surface of the chip extraction plate 7 and the lower plate 3.
When the chip extraction plates 5 and 7 are arranged at a position close to the lower plate 3, a spring 14 may be wound around the upper and outer surfaces of the chip extraction plate 5 and the upper plate 2.

  Reference numeral 15 denotes a swinging arm pivotally pivoted by the pivot point 16 at a central portion of the side plate 4 constituting the base plate, for example, using a pin as the pivot point 16. A front pin 17 and a rear pin 18 projecting toward the moving grooves 11 and 12 are attached to each free end side, which is in front of 15 and 15, at intervals in the front-rear direction.

The front pin 17 and the rear pin 18 may be connected in the front-rear direction and configured as one protruding member.
The swing arm 15 may be provided only on one side of the side plate 4.

  In the welding electrode tip removal device having the above-described configuration, the welding gun including the electrode tip 19 to be extracted is directed toward the electrode tip removal device 1 as indicated by an arrow A from the left side of FIG. It is set as the state which moved and was located so that both the nail | claws 6 and 8 of an extraction plate may fit in the clearance gap between the electrode tip 19 and the shank 20. FIG. At this time, the swinging arms 15 and 15 are in a substantially horizontal state, the pins 17 and 18 are placed in the movement grooves 11 and 12 in a horizontal state in the front and rear directions, and the chip extraction plates 5 and 7 are in a stacked state. The spring 14 is positioned substantially at the top of the support column 13 and abuts against the outer surface of the chip extracting plate 7 to hold the chip extracting plates 5 and 7. (Indicated in FIG. 4 by a solid line).

  Next, the robot moves the welding gun downward linearly to push the top surfaces of the stacked chip extraction plates 5 and 7 with the shank 20, and the stacked chip extraction plates 5 and 7 move downward, As the chip extraction plates 5 and 7 move downward, the free ends of the swinging arms 15 and 15 are pushed downward, and the swinging arms 15 and 15 are inclined with the pivot point 16 as a support shaft. Become.

  In the tilted state of the swing arm 15, the front pin 17 and the rear pin 18 on the free end side of the swing arm 15 are also in the same tilt state, and the vertical direction is between the front pin 17 and the rear pin 18. A difference in height is generated, and the difference in height solves the overlap between the chip extraction plate 5 and the chip extraction plate 7, and the distance between the two is maintained while the chip extraction plates 5 and 7 are maintained in a horizontal state. The electrode tip 19 is detached from the shank 20 by the claw 6 and the claw 8 as the distance between the tip extraction plates 5 and 7 is increased. (Indicated in phantom in FIG. 4).

  As described above, when the electrode tip 19 is detached from the shank 20, that is, when the electrode tip 19 is removed, the tip removal device 1 is unmanned only by controlling the welding gun appropriately by teaching the robot. In order to operate the chip detaching device 1, the chip detaching device 1 does not require wiring or piping such as a power source or air, and the distance between the chip extraction plates 5 and 7 is expanded to be parallel to each other without difficulty. The electrode tip 19 is reliably removed from the shank 20.

In addition, since the electrode tip 19 can be set downward on the tip extraction plates 5 and 7, for example, after the downward electrode tip 19 is extracted from the shank 20, the direction of the gun is turned upside down and the downward direction toward the shank 20 as described above. The formed electrode tip 19 is preferably removed. Furthermore, since the chip removal device 1 is not affected by gravity, the chip removal device 1 itself can be used either vertically or horizontally. Teaching is also easy.
Instead of reversing the direction of the gun, the chip removing device 1 itself may be reversed up and down.

  In the case where the welding electrode tip removal device according to the present invention is applied to a stationary welding gun, etc., the electrode tip removal device is attached to a robot, and the electrode tip removal device is attached to the welding gun side by the robot. The robot may be controlled so as to lead to

  The oscillating arm 15 oscillates about the pivot point 16 during the removal work of the electrode tip 19, but if this oscillating motion is excessively performed by inertia or the like, the spring 14 is overloaded. The spring 14 may be damaged.

Accordingly, as shown in FIGS. 1 and 3, a stopper 21 of the swing arm 15 is provided between the pivot point 16 of the swing arm 15 and the pins 17 and 18 on the free end side. is there. The stopper 21 is constituted by a cylindrical contact member 23 or the like fixed between the both swinging arms 15 and 15 with bolts 22, respectively. , The contact member 23 comes into contact with the side surface of the side plate 4 of the base plate, and the swinging arms 15 and 15 are prevented from further turning. It will be.
When only one swing arm 15 is provided, the stopper 21 is cantilevered on the swing arm 15.

  Therefore, the vertical movement of the tip extraction plate 5 and the tip extraction plate 7 that are linked to the swing arm 15 is within a predetermined range, and the spring 14 is not overloaded.

  If the stopper 21 is configured such that the end faces of the contact member 23 are in contact with the inner side surfaces of the two swinging arms 15, 15, the pivot of the swinging arm 15 is provided. Even if the point 16 is loosened and the interval between the free ends of the oscillating arms 15 and 15 is about to change, the interval is suppressed by the stopper 21, and the The free end of the arm 15 can oscillate stably, and as a result, the chip extraction plates 5 and 7 can be prevented from sideways and the electrode tip 19 can be removed more reliably by the claws 6 and 8. It is.

  In the tip detaching device in the above embodiment, when the electrode tip attached to the shank is extracted, if the orientation of the electrode tip relative to the shank is different such as upward or downward, the direction of the gun is reversed or the tip is removed. The detaching device itself is turned upside down.

  Therefore, as shown in FIG. 5, in this embodiment, the chip extraction plates 5 and 7 that are slidably stacked on the support column 13 erected on the base plate are connected to the upper plate 2 of the base plate. If the direction of the electrode tip 19 with respect to the shank 20 is different, such as upward and downward, respectively, without changing the direction of the gun or reversing the tip removal device itself upside down. Depending on the orientation of the electrode chip 19, it is possible to use a set of chip extraction plates 5 and 7 on the upper plate 2 side or a set of chip extraction plates 5 and 7 on the lower plate 3 side.

  In this embodiment, the configuration of the swing arm, stopper, etc. for each set of chip extraction plates is substantially the same as in the previous embodiment, so FIG. To do.

  In this way, depending on the direction of the electrode tip 19, the set of tip withdrawal plates 5 and 7 on the upper plate 2 side is used to remove the electrode tip 19 or the set of tip withdrawal plates 5 and 7 on the lower plate 3 side. The electrode tip 19 can be extracted from the shank 20 without reversing the direction of the gun or reversing the tip detaching device itself.

FIG. 1 is a plan view of an essential part of a welding electrode tip removing apparatus according to the present invention. FIG. 2 is a front view thereof. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is a diagram for explaining the operation. FIG. 5 is a sectional view of an essential part of another embodiment of the welding electrode tip removing apparatus according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrode removal device for welding 2, 3, 4 Base plate 5, 7 Tip extraction plate 6, 8 Claw 11, 12 Pin movement groove 13 Post 14 Spring 15 Swing arm 16 Axis point 17 , 18 pin 19 Electrode tip 20 Shank 21 Stopper

Claims (3)

An apparatus for removing a welding electrode tip taper-fitted to a shank from the shank, which is in contact with the end face of the shank and the end face of the electrode tip through a gap between the large diameter portion of the shank and the electrode tip. In a device for removing the electrode tip from the shank by disposing a tip extraction plate having a substantially semicircular claw on the tip side of the removal device and pressing the end surface of the electrode tip in the axial direction of the electrode tip with the claw, The chip extraction plate is slidably inserted in a vertically slidable column on a base plate, and a spring wound around the column is brought into contact with one outer surface of both chip extraction plates, and the chip An extraction plate is arranged on the free end side of the swinging arm pivoted on the side surface of the base plate, and pins are provided to project forward and backward on the free end side of the swinging arm. A welding electrode tip characterized in that a groove for moving the pin is formed on a side surface of the scraping plate, and the swing arm and the tip extraction plate are connected by inserting the pin into the groove for movement. Removal device. 2. The welding electrode tip removing apparatus according to claim 1, wherein a stopper of the swing arm is provided between a pivot point of the swing arm and a pin on a free end side. 2. A chip extracting plate, which is stacked so as to be slidable up and down on a column erected on the base plate, is disposed on the upper plate side and the lower plate side of the base plate, respectively. Or the removal apparatus of the electrode tip for welding of Claim 2.