JP6013941B2 - Stud welding gun cleaning device - Google Patents

Description

  The present invention relates to a cleaning device for a stud welding gun, and more particularly to a technique for removing deposits attached to a stud welding gun.

  Stud welding guns used in automobile body welding lines, etc., hold the stud bolt supplied from the bolt feeder to the electrode part at the tip of the welding gun, and bring the stud bolt into contact with the welded part to trigger By pulling and applying a voltage to the stud bolt, the stud bolt can be welded to the welded portion.

  However, in the stud welding gun, since spatter (spatter: metal fine particles) adheres to the tip of the stud welding gun including the electrode portion every time the welding is performed, if welding is continued with the spatter being attached, This causes the equipment to stop due to abnormal welding.

  For this reason, various techniques for removing spatter adhering to the stud welding gun have been proposed (see Patent Documents 1 to 3). Patent Document 1 describes a technique of cutting spatter attached to an electrode portion with a rotary cutting blade. Patent Document 2 describes a technique of polishing spatter attached to an electrode portion with a polishing tool. Patent Document 3 describes a technique for removing spatter adhering to an electrode portion by applying stripped fibers with pressurized air.

Japanese Utility Model Publication No. 6-29775 Japanese Utility Model Publication No. 3-103150 Japanese Utility Model Publication No. 5-33963

  However, all of the above-described prior arts require operations and adjustments to bring the rotary cutting blade, polishing tool, and belt-like fiber into contact with the tip of the stud welding gun, and are attached to the tip of the stud welding gun. It was difficult to remove the kimono quickly and easily.

  An object of the present invention is to provide a cleaning device for a stud welding gun that can quickly and easily remove deposits adhering to the tip of the stud welding gun simply by spraying an abrasive.

  A cleaning device for a stud welding gun according to an aspect of the present invention is a cleaning device for a stud welding gun that removes deposits attached to the tip of a stud welding gun including an electrode portion that holds a stud bolt. A cleaning chamber having an insertion port into which the tip of the welding gun is inserted, an abrasive spray nozzle provided in the cleaning chamber for spraying abrasive toward the tip of the stud welding gun, and so as to cover the insertion port And an insertion port covering member that prevents scattering of the abrasive.

  It is preferable that a plurality of abrasive spray nozzles are provided along the circumferential direction of the insertion opening.

  It is preferable that the abrasive spray nozzle is provided so as to be rotatable along the periphery of the distal end portion of the stud welding gun by a reaction force when the abrasive is sprayed.

  It is preferable that the insertion port covering member is made of a brush having elasticity that extends toward the center of the insertion port of the cleaning chamber.

  A blast tank is preferably connected to the cleaning chamber for supplying the abrasive to the abrasive spray nozzle and collecting deposits and abrasives removed from the tip of the stud welding gun.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the cleaning apparatus of the stud welding gun which can remove the deposit | attachment adhering to the front-end | tip part of a stud welding gun quickly and easily between welding.

It is a perspective view which shows one Embodiment of the cleaning apparatus of the stud welding gun to which this invention is applied. It is a perspective view which shows an example of a stud welding gun. It is a principal part expanded sectional view of a cleaning apparatus. It is a top view of a cleaning device. It is a top view which shows the other example of the cleaning apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 and 2, reference numeral 1 denotes a stud bolt welder for automatically welding a stud bolt to a vehicle body in an automobile production line, for example. The stud bolt welding machine 1 includes a welding robot 4 having a stud welding gun 3 at the tip of an arm 2, a control unit 5 that controls the welding robot 4, and a bolt feeder that supplies a stud bolt 6 to the stud welding gun 3. 7.

  The welding robot 4 has a stud welding gun attachment portion 8 for attaching the stud welding gun 3 to the tip portion of the arm 2, and the stud welding gun 3 is attached to the stud welding gun attachment portion 8.

  A cleaning device 10 for the stud welding gun 3 is installed on the floor surface 9 in the vicinity of the welding robot 4, and the polishing material 12 is passed through the polishing material supply hose 11 to the cleaning device 10 at a location away from the cleaning device 10. A blast tank 14 is provided for collecting the sputter and abrasive 12 supplied and removed by the cleaning device 10 from the cleaning device 10 via a recovery hose 13.

  As shown in FIG. 2, the stud welding gun 3 has a stud welding gun main body 15 attached to the stud welding gun attachment portion 8. The stud welding gun body 15 has an electrode for holding the stud bolt 6 supplied from the bolt feeder 7 through the supply pipe 16 at the tip of the stud welding gun body 15 and applying a welding voltage to the stud bolt 6. Detecting through a limit switch lever 19 whether or not the stud bolt 6 is welded to the welded portion, and a grounding portion 18 that is in contact with the welded portion to which the stud bolt 6 is welded. And at least a limit switch 20 is provided.

  As shown in FIGS. 3 to 4, the cleaning device 10 is provided in the cleaning chamber 22 having a container-like cleaning chamber 22 having an insertion port 21 for accommodating the distal end portion of the stud welding gun 3, and the stud welding gun 3. The abrasive 12 is sprayed toward the tip 3a of the stud welding gun 3 including the electrode portion 17 so as to cover the insertion port 21 and the abrasive spray nozzle 23 for removing spatter adhering to the surface of the tip 3a. An insertion port covering member 24 that is provided and prevents the abrasive 12 from scattering and a leg portion 25 that fixes the cleaning chamber 22 to the floor surface 9 are provided. The legs 25 are fixed with bolts 26 on the floor surface 9 in the vicinity of the welding robot 4 in the automobile production line.

  The cleaning chamber 22 is formed in a cylindrical shape or a rectangular tube shape, and has a top plate portion 22a in the upper portion and a bottom plate portion 22b in the lower portion. A circular opening 27 for inserting the tip 3a of the stud welding gun 3 is formed at the center of the top plate 22a. A taper between the side plate portion 22c and the bottom plate portion 22b of the cleaning chamber 22 has a diameter reduced downward so as to guide the abrasive 12 and spatter falling and dropping in the cleaning chamber 22 to the center of the bottom plate portion 22b. It is preferable to have the part 22d. Below the bottom plate portion 22b or the tapered portion 22d of the cleaning chamber 22 (see FIG. 3), a discharge port 28 for discharging the abrasive 12 and spatter accumulated in the cleaning chamber 22 is provided. Is connected to a recovery hose 13 leading to the blast tank 14 described above.

  In the illustrated example, two abrasive spray nozzles 23 in the illustrated example are provided around the distal end portion 3a of the stud welding gun 3, and the distal end portion 3a of the stud welding gun 3 is caused by a reaction force when the abrasive 12 is sprayed. It is possible to rotate along the perimeter. The abrasive spray nozzle 23 vertically rises upward from a single base portion 23a that stands vertically, a horizontal portion 23b that branches horizontally from the upper end portion of the base portion 23a to the left and right, and a tip portion of each horizontal portion 23b. A rising portion 23c, and a nozzle tip portion 23d protruding obliquely upward approaching each other from the tip portion of each rising portion 23c in a side view (FIG. 3) and projecting in an oblique direction opposite to each other in a plan view (FIG. 4) have.

  A cylindrical bearing portion 29 having a predetermined cylindrical height is vertically erected on the bottom plate portion 22b in the cleaning chamber 22, and a base portion 23a of the abrasive spray nozzle 23 is provided around the vertical axis inside the bearing portion 29. Is rotatably supported. Legs 25 are provided on the bottom plate portion 22 b of the cleaning chamber 22 via the bottom plate 30. Abrasive material supply hose 11 is connected to the bottom plate 30 and connected to the bearing portion 29 to supply the abrasive material 12 from the blast tank 14 to the abrasive spray nozzle 23. The bearing portion 29 constitutes a swivel joint.

  The insertion port covering member 24 is directed toward the center around the insertion port 21 of the cleaning chamber 22 in order to prevent the abrasive 12 from being scattered while allowing the insertion of the tip 3a of the stud welding gun 3 from the insertion port 21. It is preferable that it consists of the brush arrange | positioned. The brush constituting the insertion port covering member 24 is made of an elastic material, for example, synthetic resin. When the distal end portion 3a of the stud welding gun 3 is inserted, the insertion of the stud welding gun 3 is allowed while elastically deforming downward. The gap between the insertion port 21 and the tip 3a of the stud welding gun 3 is covered.

  The brush constituting the insertion port covering member 24 is attached by an annular top plate portion 22a formed at the upper end portion of the cleaning chamber 22 and an annular press plate 31 screwed onto the top plate portion 22a. It has been. The tip of the brush constituting the insertion port covering member 24 may extend to the center of the insertion port, or may be slightly away from the center of the insertion port 21.

  Next, the operation of the stud welding gun cleaning device having the above-described configuration will be described. If the welding of the stud bolt 6 by the stud welding gun 3 of the welding robot 4 is performed a set number of times, the welding robot 4 moves the stud welding gun 3 to the cleaning device 10 and spatters adhering to the electrode portion 17 of the stud welding gun 3. Perform the cleaning to be removed.

  In this case, if the welding robot 4 moves to the upper part of the cleaning device 10 with the stud welding gun 3 facing downward, the stud welding gun 3 is moved downward as it is to clean the tip of the stud welding gun 3. 10 is inserted into the insertion slot 21 at the top. This insertion operation is detected by, for example, a sensor (not shown) incorporated in the program or the cleaning device.

  The cleaning device is activated by the detection signal. That is, abrasive (for example, sand, glass particles) is supplied from the blast tank 14 to the abrasive spray nozzle of the cleaning device by compressed air, and the nozzle tip 23d is vertically raised as shown in FIG. The horizontal portion 23b that branches horizontally from the upper end of the horizontal portion 23b, the rising portion 23c that rises upward from the front end portion of each horizontal portion 23b, and the horizontal portion 23b from the front end portion of each rising portion 23c at an angle of 45 degrees. In addition, since the nozzle tip portion 23d is inclined obliquely upward, the abrasive spray nozzle rotates around the vertical axis of the base portion 23a due to the spraying reaction force of the abrasive material sprayed from the nozzle tip portion. As a result, the abrasive is sprayed around the front end portion of the stud welding gun 3, and the spatter adhering to the front end portion 3a of the stud welding gun 3 can be easily removed.

  In this case, since the insertion port covering member 24 is provided so as to cover the insertion port 21 of the cleaning device 10, it is possible to prevent the abrasive from scattering from the insertion port 21. In particular, since the insertion port covering member 24 is made of a brush having elasticity extended toward the center of the insertion port 21 of the cleaning chamber 22, the brush can be inserted into the insertion port 21 according to the insertion state of the stud welding gun 3. Can be covered.

  The cleaning chamber 22 is connected to a blast tank 14 that supplies the abrasive 12 to the abrasive spray nozzle 23 and collects the spatter and abrasive removed from the tip of the stud welding gun 3. And the recovery of the sputter and the abrasive can be performed by one apparatus, and the cleaning apparatus can be simplified.

  The present invention is not limited to the embodiment described above, and various design changes can be made within the scope of the present invention. For example, FIG. 5 is a plan view showing another example of the cleaning device. The same parts as those of the cleaning device of FIG. In the cleaning device of FIG. 5, the abrasive spray nozzle 23 has a horizontal portion 23b that branches horizontally from the upper end portion of the vertically upstanding base portion, and a rising portion that rises upward from the tip portion of each horizontal portion 23b. 23c, and a nozzle tip 23d inclined obliquely upward from the tip of each rising portion 23c toward the center of the cleaning chamber 22. The abrasive spray nozzle 23 has a fixed structure that does not rotate.

  According to the cleaning device 10 of the embodiment of FIG. 5, the abrasive can be sprayed from the abrasive spray nozzle 23 arranged in four directions to the tip including the electrode portion of the stud welding gun, and the tip of the stud welding gun can be sprayed. The attached deposits can be easily removed.

3 Stud Welding Gun 6 Stud Bolt 10 Cleaning Device 17 Electrode Part 21 Insert Port 22 Cleaning Chamber 23 Abrasive Material Spray Nozzle 24 Insert Port Cover Member 25 Leg

Claims (5)

A stud welding gun cleaning device for removing deposits adhering to the tip of a stud welding gun including an electrode portion for holding a stud bolt,
A cleaning chamber having an insertion opening into which the tip of the stud welding gun is inserted;
An abrasive spray nozzle provided in the cleaning chamber and spraying an abrasive toward the tip of the stud welding gun;
An insertion port covering member that is provided so as to cover the insertion port and prevents scattering of the abrasive;
Stud welding gun cleaning device. In the cleaning device of the stud welding gun according to claim 1,
A cleaning apparatus for a stud welding gun, wherein a plurality of the abrasive spray nozzles are provided along a circumferential direction of the insertion port. In the cleaning device of the stud welding gun according to claim 1,
A cleaning apparatus for a stud welding gun, wherein the abrasive spray nozzle is provided so as to be rotatable along a periphery of a tip end portion of the stud welding gun by a reaction force when the abrasive is sprayed. In the cleaning device of the stud welding gun according to claim 1,
A cleaning apparatus for a stud welding gun, wherein the insertion port covering member is made of a brush having elasticity extending toward the center of the insertion port of the cleaning chamber. In the cleaning device of the stud welding gun according to claim 1,
A cleaning apparatus for a stud welding gun, wherein the cleaning chamber is connected to a blast tank for supplying the abrasive to the abrasive spray nozzle and collecting deposits and abrasives removed from the tip of the stud welding gun. .

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