JP2009255108A - X type servo gun equipped with transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X type servo gun equipped with a transformer, which attains miniaturization and light weight of a gun by reducing the overall length of welding equipment and allows a secondary circuit of a welding current to have a minimum length. <P>SOLUTION: The X type servo gun equipped with a transformer is constituted so that a main shaft section 19 is composed using, as a pair of right and left main shafts, the main shafts 3, 3 axially supporting the intermediate part of an oscillating arm 4, and a space 20 is formed between the main shafts on the distal end side of a gun bracket 2, and a welding transformer 18 is arranged in the space, and the welding transformer is overlapped with the main shaft section. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention comprises a main shaft that pivotally supports an intermediate portion of a swing arm, a welding transformer, a pressure drive device that pressurizes and drives the rear end of the swing arm, and a fixed arm. The present invention relates to an X-type servo gun having a transformer having an attached gun bracket.

  Conventionally, in an X-type servo gun equipped with a transformer, a main shaft that pivotally supports an intermediate portion of a swing arm, a welding transformer, and a pressurizing drive for driving the rear end of the swing arm There is a welding device having a drive device and a gun bracket to which a fixed arm is attached (see, for example, Patent Documents 1, 2, and 3).

Japanese Patent Laying-Open No. 2006-312187 (see FIG. 3). Utility Model Registration No. 3112742 (see FIG. 2). Utility model registration No. 3112747.

  By the way, in any of the above-described conventional welding apparatuses, the welding transformer is disposed between the main shaft and the pressure driving device, and the overall length of the gun bracket to which these are attached becomes longer and larger, and the pressure driving is performed. The rear end of the oscillating arm attached to the tip of the device is far away from the main shaft, and the lever ratio of the oscillating arm is reduced, and the oscillating arm is also enlarged. There's a problem.

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is to reduce the overall length of the welding apparatus to reduce the size and weight of the gun. The present invention intends to provide an X-type servo gun having a transformer in which the secondary circuit of the welding current is set to the minimum length.

  In order to achieve the above object, an X-type servo gun equipped with a transformer according to the present invention comprises a main shaft portion having a pair of left and right main shafts that pivotally support an intermediate portion of a swing arm, and A space portion is formed between the main shaft portions on the front end side, a welding transformer is disposed in the space portion, and the welding transformer overlaps the main shaft portion. Is.

  The pair of left and right main shafts, which are the main shaft portions, are connected by a small-diameter connecting shaft.

  Further, a fixed arm is pivotally supported on the main shaft portion, and an equalizing device is added between the gun bracket and the fixed arm between the main shaft portion and the pressure driving device. .

  The main shaft that supports the middle part of the swing arm is composed of a pair of left and right main shafts, and a main shaft portion is formed on the distal end side of the gun bracket. A space is formed between the main shaft portions, and the space is welded. Since the transformer is arranged so that the welding transformer overlaps with the main shaft, the overall length of the gun bracket is short and the size can be reduced, and the swinging arm attached to the tip of the pressure driving device can be reduced. -The rear end of the arm can be moved closer to the main shaft, the lever ratio of the swinging arm can be increased, the swinging arm is downsized, and the overall welding equipment is also smaller and lighter In addition, an X-type servo gun with a transformer that can easily and easily shorten the supply of secondary current from the transformer to the arm.

  Further, when the pair of left and right main shafts that are the main shaft portions are connected by a small-diameter connecting shaft, in addition to the above effects, there is no particular influence on the formation of the space portion between the main shaft portions, and both main shafts are It is possible to support the intermediate portion of the swing arm more stably by maintaining the mutual rigidity and operating evenly.

  In addition to the above effects, when a fixed arm is pivotally supported on the main shaft and an equalizing device is added between the main shaft and the pressure drive device between the gun bracket and the fixed arm. Thus, the equalizing device can be disposed within the minimum necessary distance (dead space) between the main shaft portion and the pressure driving device, and the equalizing device can be added without any particular influence on the overall length of the gun bracket. Thus, the function of the X-type servo gun equipped with a transformer can be further improved.

  The main shaft that supports the middle part of the swing arm is composed of a pair of left and right main shafts, and a main shaft portion is formed on the distal end side of the gun bracket. A space is formed between the main shaft portions, and the space is welded. An X-type servo gun provided with a transformer in which a transformer is disposed so that the welding transformer overlaps the main shaft portion.

A first embodiment of the present invention will be described with reference to FIGS.
1 is a side view of an X-type servo gun according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a cross-sectional view taken along line AA of FIG. 1, and FIG.

  In the figure, reference numeral 1 denotes an X-type servo gun. A gun bracket 2 of the servo gun 1 includes a main shaft 3 provided above the tip thereof and a swing arm 4 that swings about the main shaft 3 as a fulcrum. And a fixed arm 6 are held, and one end of the gun bracket 2 is connected to a robot (not shown) by a connecting plate 7.

  A shank 9 having an electrode 8 is connected to the tip of the swing arm 4, and an intermediate portion of the swing arm 4 extends downward and is pivotally supported by the main shaft 3 provided on the gun bracket 2. The swing arm 4 extends further rearward and upward from the main shaft 3 side, and its rear end portion is connected to the front end portion of the pressure driving device 5.

  The pressure driving device 5 is pivotally supported by the gun bracket 2 by a pivot device 10 at a position substantially the same level as the main shaft 3 and at a position close to the main shaft 3 behind the main shaft 3. For example, it is composed of a motor, a screw shaft and a nut, and converts the rotation of the motor 11 into a linear motion of the pressure rod 12, and this linear motion is an additive attached to the tip of the pressure drive device 5. The oscillating arm 4 is connected to the rear end portion of the oscillating arm 4 via the pressure rod 12 and driven by the motor 11 so that the oscillating arm 4 oscillates with the main shaft 3 as a fulcrum. It has become.

  The fixed arm 6 is fixed to the front end side of the gun bracket 2 with bolts 14, 14,... Below the main shaft 3 with insulating spacers 13, 13 interposed therebetween. A shank 16 having an electrode 15 is connected to the front end portion thereof, and a welding transformer 18 is disposed on the rear end portion 17 side.

  As shown in FIG. 3, the main shaft 3 is provided on the gun bracket 2 in a pair of left and right so as to pivotally support a bifurcated portion below the intermediate portion of the swing arm 4 and constitutes a main shaft portion 19. is doing. Therefore, a space portion 20 (see FIG. 3) is formed between the main shaft portions 19 on the distal end side of the gun bracket 2.

  The welding transformer 18 is composed of, for example, a small and compact inverter transformer, and the welding transformer 18 overlaps the main shaft portion 19 in the space portion 20 between the main shaft portions 19. In this way, the gun bracket 2 is fixed to the gun bracket 2 with the bolts 21, 21... So that the mounting portion of the pressure driving device 5 is as close as possible to the main shaft portion 19.

  One terminal 22 of the secondary current terminal of the welding transformer 18 is joined to a connection portion 23 formed on the fixed arm 6 by a bus bar 24, and the secondary current on the rectifier 25 side of the welding transformer 18 is also connected. The other terminal 26 of the terminal is connected to the swing arm 4 through a shunt 27.

  The X-type servo gun is configured as described above. First, the pressure driving device 5 is driven to move the tip of the swing arm 4 downward, and a workpiece (not shown) is formed between the electrodes 8 and 15. ) Is held (the state of FIG. 1 is obtained). During the welding operation, the welding transformer 18 is operated by holding the workpiece between the electrodes 8 and 15 and operating the welding transformer 18 while the swing arm 4 is in a pressurized state as described above. The rectified welding current is conducted as a direct current from the other terminal 26 of the secondary current terminal through the shunt 27 to the swing arm 4 and is sent from the welding electrodes 8 and 15 to the fixed arm 6 and then fixed. A current is conducted from the connecting portion 23 at the rear end of the arm 6 to one terminal 22 of the secondary current terminal of the welding transformer 18 via the bus bar 24.

  According to the present invention, the main shaft 3 that pivotally supports the intermediate portion of the swing arm 4 is used as the pair of left and right main shafts 3, 3 to form the main shaft portion 19. Since the space portion 20 is formed between them, the welding transformer 18 is disposed in the space portion 20, and the welding transformer 18 overlaps the main shaft portion 19, the total length of the gun bracket 2 is The rear end of the oscillating arm 4 that is short, small, and attached to the tip of the pressure driving device 5 can be brought close to the main shaft portion 19, and the lever ratio of the oscillating arm 4 can be reduced. The oscillating arm 4 can be made smaller and the entire welding apparatus 1 can be made smaller and lighter, and the supply of secondary current from the transformer 18 to the arms 4 and 6 can be shortened and simplified. It becomes an X-type servo gun with a transformer that can be easily done.

A second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the configuration is substantially different from that of the first embodiment except that a configuration in which a pair of left and right main shafts 3 and 3 as the main shaft portion 19 are connected by a small-diameter connecting shaft 30 is adopted. Since there is not, description of the whole welding apparatus 1 is abbreviate | omitted.

  The small diameter of the small-diameter connecting shaft 30 is smaller than the diameter of the main shaft 3, and the small-diameter connecting shaft 30 has a special influence on the formation of the space 20 between the main shaft portions. The rectifier 25 side of the welding transformer 18 can be sufficiently arranged.

  As described above, since the pair of left and right main shafts 3 and 3 as the main shaft portion 19 are connected by the small-diameter connecting shaft 30, in addition to the effects of the first embodiment, the formation of the space portion 20 between the main shaft portions 19 is exceptional. Thus, both the main shafts 3 and 3 are maintained firmly to each other and operate equally, and a more stable shaft support of the intermediate portion of the swing arm 4 is also possible.

A third embodiment of the present invention will be described with reference to FIGS.
In the third embodiment, the fixed arm 6 is pivotally supported on the main shaft portion 19, and the equalizing device 40 is provided between the main shaft portion 19 and the pressure drive device 5 between the gun bracket 2 and the fixed arm 6. Except for employing the added configuration, the configuration is not substantially different from that of the first embodiment or the second embodiment, so the same reference numerals are given to the drawings and the description thereof is omitted.

  The fixed arm 6 is formed with a bifurcated extension 41 on the rear end side with spacers 13 and 13 of insulating material sandwiched between the pair of left and right main shafts 3. , 3, and one end of, for example, a spring constituting the equalizing device 40 is connected to the free end of the rear portion thereof. The other end of the spring constituting the equalizing device 40 is connected to the gun bracket 2.

  The installation site connected to the gun bracket 2 of the equalizing device 40 is within the minimum necessary distance between the main shaft portion 19 and the pressure driving device 5 (from the load capacity of the ball screw in the pressure driving device 5). Even if the equalizing device 40 is added, the first embodiment or the second embodiment described above is employed, even if the equalizing device 40 is added to the main shaft portion 19 and the pressure driving device 5. It is not necessary to extend the entire length of the gun bracket 2 in FIG.

  The welding transformer 18 disposed in the space 20 between the main shafts 19 is fixed to the extension 41 by bolts 21, 21... In the extension 41 of the fixed arm 6.

  As described above, the fixed arm 6 is pivotally supported on the main shaft portion 19, and the equalizing device 40 is added between the gun bracket 2 and the fixed arm 6 between the main shaft portion 19 and the pressure driving device 5. Therefore, when an excessive pressure load from the swing arm 4 is applied to the work or the fixed arm 6, the load can be released to the equalizing device 40, and the work or the welding device as a whole. Is maintained safely, in addition to the effects of the first embodiment or the second embodiment, the equalizing device 40 can be disposed within the minimum necessary distance between the main shaft portion 19 and the pressure driving device 5, The equalizing device 40 can be added without any particular effect on the overall length of the gun bracket 2, and the function of the X-type servo gun provided with a transformer can be further improved.

1 is a side view of an X-type servo gun according to the present invention. FIG. It is AA sectional drawing of FIG. It is a principal part bottom view of FIG. It is principal part sectional drawing of the other Example of the X-type servo gun which concerns on this invention. It is the principal part bottom view. FIG. 6 is a side view of still another embodiment of the X-type servo gun according to the present invention. It is the principal part bottom view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 X type servo gun 2 Gun bracket 3 Main shaft 4 Oscillating arm 5 Pressurizing drive device 6 Fixed arm 18 Welding transformer 19 Main shaft portion 20 Space portion 30 Connecting shaft 40 Equalizing device

Claims (3)

A main shaft that pivotally supports an intermediate portion of the swing arm, a welding transformer, a pressure drive device that pressurizes the rear end of the swing arm, and a gun to which a fixed arm is attached In the X-type servo gun having a transformer having a bracket, a main shaft portion is configured with a pair of left and right main shafts supporting the intermediate portion of the swing arm as a pair of left and right main shafts. A transformer is characterized in that a space is formed between the main shafts, the welding transformer is disposed in the space, and the welding transformer overlaps the main shaft. X-type servo gun. 2. An X-type servo gun with a transformer according to claim 1, wherein a pair of left and right main shafts which are the main shaft portions are connected by a small-diameter connecting shaft. The fixed arm is pivotally supported on the main shaft portion, and an equalizing device is added between the main shaft portion and the pressure drive device between the gun bracket and the fixed arm. An X-type servo gun comprising the transformer according to Item 2.