JP2010058154A - Electric driving unit for x type gun - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric driving unit for X-type gun by combining a pressure application driving body with a motor, wherein the unit is attached to a fixed arm or a gun bracket utilizing a housing on the rear end side of the motor, thereby rendering the unit compact and capable of stably holding the pressure application driving device and causing the maintenance thereof to be executed with reliability and ease. <P>SOLUTION: The electric driving unit for X-type gun, wherein the pressure application driving body 8 and a motor 12 are combined with each other, comprises: a pressure application shaft 9 having a part to be pulled into the motor, with a screw shaft secured in a rotary shaft of the motor and a nut to be threaded with the screw shaft provided in the pressure application shaft; a hollow part for containing the screw shaft formed inside the pressure application shaft; a bearing 11 provided at thr pressure application shaft for axially supporting the rear end of the swing arm and the pressure application shaft; a guide bearing of the pressure application shaft and a thrust bearing of the rotary shaft of the motor provided in the front end side of the motor; a bearing for supporting the rotary shaft of the motor provided in the rear end side of the motor: and a bearing 23 for pivotally supporting the housing and the fixing arm or the gun bracket in the housing 22 of the bearing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  According to the present invention, an intermediate portion of a swing arm, which is one of two gun arms having electrodes opposed to each other at the tip, is pivotally supported on a gun bracket by a pivot. An X-type gun in which the rear end of the arm is connected to a pressure shaft provided in the main body of the pressure drive unit, and the rear end of the fixed arm which is the other arm is connected to the main body of the pressure drive unit or the gun bracket. This relates to an electric drive unit.

  Conventionally, of two gun arms having electrodes opposed to each other at the tip, the middle part of the swing arm, which is one arm, is pivotally supported on the gun bracket by a pivot, and the swing arm The rear end is connected to a pressure shaft provided in the pressure drive unit main body, the rear end of the fixed arm which is the other arm is fixed to the gun bracket, and the pressure drive unit main body is attached by an attachment member. There is an electric X-type gun that is held by the gun bracket (see, for example, Patent Document 1).

  In addition, the main body of the pressure drive unit and the motor are combined, and a pressure shaft having a portion driven by the motor and drawn into the motor is provided, and a rotation shaft that is a rotor of the motor is provided. A hollow formed in a hollow shaft, fixing a screw shaft in the rotation shaft, providing a nut to be screwed to the screw shaft in the pressure shaft, and housing the tip end side of the screw shaft in the pressure shaft There is a driving device for a welding apparatus in which a slab is formed (see, for example, Patent Document 2).

Utility Model Registration No. 3112742 JP 2001-293577 A

  By the way, in the former electric X-type gun, a pressurizing drive unit body is attached to the front part of the motor, and a screw shaft and a pressurizing shaft which are rotated by rotation of the motor in the pressurization drive unit body. Rotating motion by the motor is converted into reciprocating motion of the pressurizing shaft, and this pressurizing drive unit is a pressurizing drive unit arranged at the front part of the motor Since the main body is attached to the gun bracket by the attachment member, the motor is positioned behind the attachment member of the pressure drive unit main body, the length of the pressure drive device becomes longer, the size is increased, and the swing arm When the electrode is opened and closed by the motor, the motor may swing greatly and the holding of the pressure driving device may become unstable.

  The drive device of the latter welding device is composed of a press drive unit body and a motor combined to make the entire length of the press drive device short. However, the drive device is placed at any position on the welding device. There is no consideration of installation, and there is no suggestion of a technical idea to attach it to the gun bracket using at least the housing at the rear end of the motor.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to combine a pressurizing drive unit main body and a motor to provide an electric motor for an X-type gun. By constructing the drive unit and mounting the unit to the gun bracket or fixed arm using the housing on the rear end side of the motor, it is small in size, stable holding of the pressure drive device and easy maintenance An electric drive unit for an X-type gun is to be provided.

  It is another object of the present invention to provide an electric drive unit for an X-type gun, which is advantageous for repairing, in which a screw shaft can be rotated from a manual operation hole in the event of a power failure or failure of a motor and pressure drive unit.

  In order to achieve the above object, an electric drive unit for an X-type gun according to the present invention combines a pressurizing drive unit body and a motor, and is driven by the motor and pulled into the motor. A rotation shaft of the motor is formed as a hollow shaft, a screw shaft is fixed in the rotation shaft, and a nut that is screwed with the screw shaft is provided on the pressure shaft, A cavity for accommodating the tip end side of the screw shaft is formed inside the pressure shaft, and a bearing for pivotally supporting the rear end of the oscillating arm and the pressure shaft at the front of the pressure shaft is provided. A guide bearing for the pressure shaft and a bearing for bearing the axial load of the motor rotating shaft are provided on the front end side of the motor, and a bearing for supporting the motor rotating shaft is provided on the rear end side of the motor. And a bearing for pivotally supporting the housing and the fixed arm or gun bracket by a pivot. It is an.

  Further, a manual operation hole for a screw shaft is provided at a rear end portion of the pressurizing drive unit main body.

  According to the present invention, the pressurizing drive unit main body and the motor are combined, the pressurizing shaft having a portion driven by the motor and drawn into the motor is provided, and the rotating shaft of the motor is provided. A hollow formed in a hollow shaft, fixing a screw shaft in the rotation shaft, providing a nut to be screwed to the screw shaft in the pressure shaft, and housing the tip end side of the screw shaft in the pressure shaft And a bearing that pivotally supports the rear end of the oscillating arm and the pressure shaft by a pivot is provided at the front of the pressure shaft, and the guide bearing and motor of the pressure shaft are provided at the front end of the motor. A bearing for bearing the axial load of the rotating shaft of the motor, and a bearing for supporting the rotating shaft of the motor on the rear end side of the motor, and the housing and the fixed arm or gun in the housing of the bearing Since a bearing that pivotally supports the bracket with a pivot is provided as an electric drive unit for the X-type gun, sputtering from the pressure shaft, etc. It is difficult to penetrate and the nut and screw shaft can be sufficiently protected, can sufficiently withstand the bending stress from the arm during welding, the holding of the gun is more stable, and interference with workpieces and jigs Thus, the electric drive unit for the X-type gun that can be welded very easily, is small, stably holds the pressure drive device, and is easy to maintain reliably.

  Also, since the screw shaft manual operation hole is provided in the rear end of the pressure drive unit body, the screw shaft can be rotated from the manual operation hole in the event of a power failure or failure of the motor and pressure drive unit. This is an electric drive unit for an X-type gun that is advantageous for repair.

  Of the two gun arms with electrodes facing each other at the tip, the middle part of the swing arm, which is one of the arms, is pivotally supported on the gun bracket by a pivot, and the rear end of the swing arm Is connected to a pressure shaft provided in the main body of the pressurizing drive unit, and the rear end of a fixed arm which is the other arm is connected to the main body of the pressurizing drive unit or the gun bracket. A pressure drive unit main body and a motor are combined, a pressure shaft having a portion driven by the motor and drawn into the motor is provided, and the rotation shaft of the motor is formed as a hollow shaft, A screw shaft is fixed in the rotary shaft, and a nut that is screwed to the screw shaft is provided in the pressure shaft, and a cavity is formed inside the pressure shaft so that the tip side of the screw shaft is accommodated. A bearing for pivotally supporting the rear end of the oscillating arm and the pressure shaft by a pivot is provided at the front, and a guide bearing for the pressure shaft is provided on the front end side of the motor. A bearing for bearing the axial load of the rotating shaft of the motor and a bearing for supporting the rotating shaft of the motor on the rear end side of the motor, and the housing and the fixed arm in the housing of the bearing; Alternatively, an electric drive unit for an X-type gun provided with a bearing that pivotally supports the gun bracket with a pivot.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 4 of the accompanying drawings.
FIG. 1 is a schematic side view of an electric X-type gun provided with an electric drive unit in which a motor according to the present invention and a pressure drive unit main body are combined, FIG. 2 is a plan view thereof, and FIG. A longitudinal sectional view of an electric drive unit, FIG. 4 is a plan view thereof.

In FIGS. 1 and 2, reference numeral 1 denotes a swing arm which is one gun arm having an electrode 2 at the tip, and 3 denotes the other gun arm having an electrode 4 facing the electrode 2 at the tip. It is a fixed arm.
An intermediate portion of the swing arm 1 is pivotally supported by a pivot 5 at a tip of a gun bracket 6 connected to a wrist (not shown) of the robot. The fixed arm 3 is fixed to the tip of the gun bracket 6. An inverter transformer 7 is attached to and held by the gun bracket 6 behind the pivot shaft 5.

  Further, the pressure shaft 9 side protruding from the pressure drive unit body 8 is connected to the rear end of the swing arm 1 by a pivot 10 such as a hinge pin, and 11 is added to support the pivot 10. This is a bearing provided at the tip of the pressure shaft 9.

  Referring to FIGS. 3 and 4, reference numeral 12 denotes an electric motor positioned in the pressurizing drive unit body 8, and the motor 12 and the pressurization drive unit body 8 are combined. The rotating shaft 13 which is the rotor of the motor 12 is formed as a hollow shaft, and a screw shaft 14 such as a ball screw is fastened to the hollow portion of the rotating shaft 13 by, for example, a screw or wedge-coupled. A fixing portion 15 is formed by, for example, and the rotation shaft 13 and the screw shaft 14 are integrated. Further, a nut 16 such as a ball nut is provided integrally or by fastening with a screw or the like on the rear end side of the pressurizing shaft 9, and the screw formed on the nut 16 is the screw. The screw of the shaft 14 is screwed. The nut 16 provided on the rear end side of the pressure shaft 9 is positioned so as to reciprocate within the hollow portion of the rotating shaft 13.

  A cavity 17 in which the tip end side of the screw shaft 14 is accommodated is formed in the pressure shaft 9. The pressure shaft 9 is guided by a guide bearing 18 provided on the front end side of the motor 12 so as to reciprocate linearly.

  Reference numeral 19 denotes a thrust bearing provided at the front portion of the motor 12, which bears an axial load of the rotating shaft 13 of the motor 12, and 20 denotes a housing of the thrust bearing 19.

  Reference numeral 21 denotes a bearing provided at the rear of the motor 12 to support the rotating shaft of the motor. The housing 22 of the bearing 21 is provided with bearings 23 and 23 that open to the gun bracket 6 side. The bearings 23 and 23 constitute a bearing for pivotally supporting the housing 22 and the gun bracket 6 with pivots 24 and 24.

  Therefore, the pressure drive unit body 8 and the motor 12 are combined, the tip of the pressure shaft 9 is turned to the swing arm 1 by the pivot 10, and the housing 22 on the rear end side of the motor 12 is pivoted. Bearings 11 and 23 are provided so as to be connected to the gun bracket 6 by 24 and 24, respectively, to constitute an electric drive unit.

  Reference numeral 25 denotes an encoder disposed at the rear of the motor 12, and 26 denotes a conductive connection device for the motor 12 and the encoder 24.

  In the electric X-type gun constructed as described above, when the pressurizing drive unit body 8 is in the state shown in FIG. 3, the pressurizing shaft 9 is most retracted into the motor 12 and the swing arm 1 is in the open position as shown in phantom in FIG.

  When the motor 12 is driven from this state to rotate the rotary shaft 13, the screw shaft 14 integrated with the rotary shaft 13 is rotated, and this rotation is a pressurization that is screwed with the screw of the screw shaft 14. It is transmitted to the screw of the nut 16 provided on the shaft 9, and the pressure shaft 9 is advanced so as to be sequentially pushed out from the pressure drive unit main body 8. The advancement of the pressure shaft 9 swings the swing arm 1 with the pivot 5 as a fulcrum, and closes the electrode 2 toward the electrode 4. Then, when the pressure shaft 9 extends and the workpiece (not shown) is sandwiched between the electrodes 2 and 4, the gun performs a welding operation by power transmission from the transformer 7.

  When the welding operation is completed, when the motor 12 is driven in reverse to rotate the rotary shaft 13 in the opposite direction, the screw shaft 14 is rotated, and this rotation is transmitted to the nut 16 on the pressure shaft 9 side. The pressurizing shaft 9 is retracted so as to be sequentially pulled into the pressurizing drive unit main body 8. The retraction of the pressure shaft 9 causes the swing arm 1 to swing about the pivot 5 and the electrode 2 to open away from the electrode 4. Then, with the pressing shaft 9 returned to the original position as shown in FIG. 3, the swing arm 1 is in the open position indicated by the phantom line in FIG.

  By the way, the motor 12 for driving the pressure shaft 9 is combined with the pressure drive unit main body 8 together with a part of the pressure shaft 9, so that this gun is compactly and compactly assembled into a work and a work. There is no interference with the tool, and the pressure shaft 9, the swing arm 1, and the housing 22 on the rear end side of the motor and the gun bracket 6 are connected by pivots 10, 24 such as hinge pins, respectively. Therefore, the swinging motion of the swinging arm 1 is stable and the swinging operation is not unreasonable, and the pressurizing drive unit main body 8 swings within a relatively narrow range with the pivot 24 as a fulcrum. In addition, since the rear end of the pressurizing drive unit main body 8 is maintained without being obstructed by anything, the maintenance of the encoder 25 and the like can be easily and effectively performed, and the electric drive unit can be attached and detached. Easy and very easy to maintain It is.

  The pressurizing drive unit body 8 includes a pressurizing shaft 9 having a portion driven by the motor 12 and drawn into the motor 12, and the rotating shaft 13 of the motor 12 is formed as a hollow shaft. The screw shaft 14 is fixed in the rotary shaft 13, and a nut 16 that is screwed with the screw shaft 14 is provided on the pressure shaft 9. The tip end side of the screw shaft 14 is accommodated in the pressure shaft 9. The pressurizing drive unit main body 8 can be shortened in the moving direction of the pressurizing shaft 9 and the motor 12 can be miniaturized.

  The portion of the pressure shaft 9 protruding from the motor 12 is not formed with a screw, and the pressure shaft 9 is guided by a guide bearing 18, so that the pressure shaft 9 is not welded. It can sufficiently withstand the bending stress from the swing arm 1 side, and it is difficult for spatter and the like to enter the motor 12 from the pressurizing shaft 9. Since it is located in the cavity 17 inside the pressure shaft 9, the nut 16 and the screw shaft 14 can be sufficiently protected.

A second embodiment of the present invention will be described with reference to FIGS. 5 and 6 of the accompanying drawings.
FIG. 5 is a schematic side view of another embodiment of an electric X-type gun provided with an electric drive unit in which a motor and a pressure drive unit body according to the present invention are combined, and FIG. 6 is a plan view thereof. It is.

  In this embodiment, the configuration of the electric drive unit in which the main body of the pressure drive unit and the motor are combined is substantially the same as that of the first embodiment shown in FIGS. The description is omitted.

  5 and 6, the rear end side 3 ′ of the fixed arm 3 extends rearward below the gun bracket 6, and the end of the rear end side 3 ′ is the rear end side of the motor 12. These are connected by pivots 24 and 24 that are pivotally supported by a bearing 23 provided in the housing 22.

  Therefore, the pressure drive unit body 8 and the motor 12 are combined, the tip of the pressure shaft 9 is turned to the swing arm 1 by the pivot 10, and the housing 22 on the rear end side of the motor 12 is pivoted. Bearings 11 and 23 are provided so as to be connected to the rear end side 3 ′ of the fixed arm 24 and 24, respectively, to constitute an electric drive unit, and the swinging motion of the swinging arm 1 is stabilized. As a result, the electric drive unit can be easily mounted and removed, and maintenance can be performed very easily and accurately.

  In the first and second embodiments, as shown in FIGS. 3 and 4, the cover case 8 ′ forming the rear end portion of the pressurizing drive unit body 8 is formed at the rear end of the screw shaft 14. A manual operation hole 28 is provided toward the square or hexagonal processed portion 27.

  When the manual operation hole 28 is provided, when the pressure shaft 9 cannot move and the gun arm is not opened or closed due to a power failure or a failure of the motor 12, the manual operation hole 28 is provided. When the tool 27 is inserted to rotate the machining portion 27, the screw shaft 14 is rotated by the rotational force, the gun arm can be opened and closed, and the gun arm can be easily moved to a desired position. This is an electric drive unit for an X-type gun that is advantageous for repair.

  The square or hexagonal processed portion 27 formed at the rear end portion of the screw shaft 14 may be formed so as to protrude from the rear end portion of the screw shaft 14 or may be formed by being retracted inside the rear end portion. May be.

FIG. 1 is a schematic side view of an electric X-type gun provided with an electric drive unit in which a motor and a pressure drive unit main body according to the present invention are combined. FIG. 2 is a plan view thereof. FIG. 3 is a vertical cross-sectional view of the electric drive unit as the main part. FIG. 4 is a plan view thereof. FIG. 5 is a schematic side view of an electric X-type gun according to another embodiment provided with an electric drive unit in which a motor according to the present invention and a pressure drive unit main body are combined. FIG. 6 is a plan view thereof.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oscillating arm 2, 4 Electrode 3 Fixed arm 3 'Extension part of fixed arm 5 Pivot 6 Gun bracket 8 Pressurization drive body 9 Pressurization shaft 10 Pivot 11 Bearing 12 Motor 13 Rotating shaft 14 Screw shaft 16 Nut 17 Cavity 18 Guide bearing 19 Thrust bearing 21 Rotary shaft bearing 22 Housing 23 Bearing 24 Pivot 28 Manual operation hole

Claims (2)

Of the two gun arms with electrodes facing each other at the tip, the middle part of the swing arm, which is one of the arms, is pivotally supported on the gun bracket by a pivot, and the rear end of the swing arm Is connected to a pressure shaft provided in the main body of the pressurizing drive unit, and the rear end of a fixed arm which is the other arm is connected to the main body of the pressurizing drive unit or the gun bracket. A pressure drive unit main body and a motor are combined, a pressure shaft having a portion driven by the motor and drawn into the motor is provided, and the rotation shaft of the motor is formed as a hollow shaft, A screw shaft is fixed in the rotary shaft, and a nut that is screwed to the screw shaft is provided in the pressure shaft, and a cavity is formed inside the pressure shaft so that the tip side of the screw shaft is accommodated. A bearing for pivotally supporting the rear end of the oscillating arm and the pressure shaft by a pivot is provided at the front, and a guide bearing for the pressure shaft is provided on the front end side of the motor. A bearing for bearing the axial load of the rotating shaft of the motor and a bearing for supporting the rotating shaft of the motor on the rear end side of the motor, and the housing and the fixed arm in the housing of the bearing; An electric drive unit for an X-type gun, wherein a bearing for pivotally supporting the gun bracket with a pivot is provided. 2. The electric drive unit for an X-type gun according to claim 1, wherein a manual operation hole for a screw shaft is provided at a rear end portion of the pressure drive unit main body.