JP2564240Y2 - Welding nut feeding device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding nut feeding device for automatically feeding a welding nut to a vertical plate-shaped workpiece with high accuracy.

[0002]

2. Description of the Related Art Conventionally, in a stationary nut welding machine which feeds and welds a nut, a portion to be welded is made horizontal, and in feeding the nut, inertia or gravity is used for moving the nut.

[0003]

In the stationary nut welding machine, the nut is fed and welded to a horizontal surface.
When welding a nut to a vertical plate-like welded part, the welding surface is changed by changing the posture of the work to be welded, the feeding of the nut is also limited to horizontal, and the fed nut is placed on the fixed positioning pin. Located by gravity. Therefore, in this nut feeding, the position of the surface to be welded is limited, and the inertia and gravity are used for the movement of the nut, so that the nut is set obliquely on the positioning pin provided at the center of the lower electrode, There was no certainty in the positioning of the feeding of the nut, such as when the nut hit and scattered. In particular, when the object to be welded is large or heavy, a large jig for holding the welding portion horizontally is required, and a great deal of man-hours have been required to change the posture.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention solves the above-mentioned problem by moving a welding nut in a direction perpendicular to a horizontal axis direction to a vertical plate-shaped workpiece having a horizontal hole. In addition, while moving and feeding by means of a chuck or the like to the extension of the horizontal hole center line, a movable electrode is provided on the extension facing the horizontal hole, and in the horizontal hole,
A positioning pin from the center of the other electrode corresponding to the moving electrode is provided so as to be movable by a moving means, the welding nut is positioned by the positioning pin, and the welding nut is clamped by the moving electrode and the positioning pin to form a lateral hole. To provide a welding nut feeder that moves the nut to the position, securely clamps and feeds the nut with high positional accuracy, automates this, and allows for the addition of the projection nut to the vertical surface in addition to the hammer. Is what you do.

[0005]

In the present invention, the welding nut 7 sent by the air tube is sent to the chuck 8 by the sent pneumatic pressure, and when the welding command signal comes, the chuck 8 advances by the cylinder to be welded to the vertical plate-like welded portion. When the welding nut 7 is moved and supplied to an extension of the center line of the horizontal hole 1b, and supplied to this position, the positioning pin 3 from the center of the electrode 6 passes through the horizontal hole 2 of the vertical plate-like welded portion 1b, and the welding nut 7 is roughly positioned by inserting the tip 3a and the nut guide 3b into the screw hole of the welding nut 7, then the lower end of the screw hole of the welding nut 7 is inserted into the intermediate conical portion 3c.
While pressing, the welding nut 7 is pushed out from the chuck 8 by using the slope of the welding nut 7 and pressed against the moving side electrode 4 to stop. Next, the chuck 8 returns to its original state.

Here, the magnitude relationship between the outer diameter of the pin and the diameter of the lateral hole is such that the nut guide portion pin diameter <the nut thread diameter <the lateral hole guide portion pin diameter <the lateral hole diameter, and the nut guide portion 3b of the pin.
It can be understood that an intermediate conical portion 3c can be formed between the nut and the lateral hole guide portion 3d, and the welding nut 7 roughly positioned by the nut guide portion 3b can be pinned by pushing the lower end of the screw hole with the intermediate conical portion 3c. While being centered at the center, it is clamped by the moving side electrode 4. Further, it is considered that the center of the pin and the center of the horizontal hole 2 are almost the same, and the welding nut 7 is positioned with high precision with respect to the horizontal hole 2.

Next, while applying air pressure to the cylinder of the positioning pin 3, the electrode 4 is connected to the vertical plate-like weld 1b with a larger force.
Electrode 4 and positioning pin intermediate conical part 3
c, while holding the welding nut 7 between them,
b, the welding nut 7 is moved to the position of the lateral hole 2 and further moved to the electrode 6, and then the positioning pin 3 is retracted and returned. The welding can be automatically performed on the vertical plate-shaped welded portion 1b.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a welding nut feeding device according to the present invention, which will be specifically described below with reference to the drawings.

Reference numeral 1 denotes an object to be welded having a horizontal piece 1a and a vertical plate-to-be-welded portion 1b.
Further, the electrode 4 provided on the moving body 5 is located on the extension of the center line of the horizontal hole 2. A rod-shaped positioning pin 3 passing through the horizontal hole 2
A hole 4a for inserting the distal end 3a of the hole is formed.

[0010] The positioning pin 3 includes the tip 3a, the nut guide 3b, the intermediate conical portion 3c, and the guide 3 of the lateral hole 2.
d, etc., and is moved by a cylinder (not shown) through the center of the electrode 6 positioned on the side of the horizontal hole 2.

A welding nut 7 sent by an air tube is received by a spring chuck 8 at an extended position of the center line of the horizontal hole 2 of the vertical plate-like welded portion 1b, and the chuck 8 is attached to a rod 9 from a cylinder. The welding nut 7 is supplied to a position on the center line of the lateral hole 2 by the rod 9 by operating the cylinder by the welding command signal (in this case, the chuck 8 is supplied in parallel with the surface to be welded. , May be supplied at a slight angle).

When the welding nut 7 is supplied on the center line of the horizontal hole 2, the positioning pin 3 moves forward, and the tip 3a and the nut guide 3b pass through the screw hole of the nut and the intermediate conical portion 3
c corresponds to the lower end of the screw hole of the welding nut 7. Subsequently, when the positioning pin 3 is advanced using the slope portion of the welding nut 7, the component force of the pin advancing force overcomes the spring force to open the chuck 8, the welding nut 7 is pushed out from the chuck 8, and the welding nut 7 is It is centered and clamped while being pressed against the moving electrode 4.

When the chuck 8 is retracted, the component of the retracting force of the chuck overcomes the spring force by using the round bar shape of the positioning pin 3 in the same manner as described above, and the chuck 8 is opened, disengaged from the positioning pin 3 and welded. Return to the nut supply outlet.
Next, the moving-side electrode 4 moves with a moving force that is superior to the advancing force of the positioning pin 3, presses the welding nut 7 against the vertical plate-like welded portion 1b, and conducts electricity to complete welding.

[0014]

According to the present invention, as described above, the welding nut sent by the air tube is received by the spring chuck, and this chuck is attached to the cylinder rod, and is fed to the extension of the horizontal hole. The center electrode is pressed against the moving electrode while centering at the intermediate conical portion of the positioning pin, and further moved to the vertical plate-like welded portion while holding the welding nut between the moving electrode and the intermediate conical portion of the positioning pin, and the two electrodes are energized. Vertical welding by returning the spring chuck attached to the cylinder rod, which receives the welding nut, perpendicularly to the horizontal direction at the time of welding start and clamping of the welding nut. The supply of welding nuts to the surface can be automated, the chuck consists of several parts and is inexpensive, and the welding nut is positioned above the height of the welding nut. Since the pin is pushed out of the chuck and pressed against the moving side electrode, it is securely held even if the positioning pin is positioned in the horizontal direction, and the welding nut is pushed while pressing the lower end of the screw hole with the intermediate conical part of the positioning pin. The nut center is the same as the pin center because it is clamped between the electrodes, and it is positioned accurately.The welding nut is securely held and supplied to the horizontal hole of the vertical plate-like welded part, and both electrodes are welded to the welding nut. Since the object is clamped, the projection nut can be welded on a vertical surface.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view of the present invention in which an object to be welded and a welding nut are fed.

FIG. 2 is a front view showing a state in which a welding nut is sandwiched between a moving-side electrode and a positioning pin and is moved to a vertical plate-like welded portion;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Workpiece 1a Horizontal piece 1b Vertical plate-shaped workpiece 2 Horizontal hole 3 Positioning pin 3a Tip part 3b Nut guide part 3c Intermediate conical part 3d Side hole guide part 4, 6 Electrode 4a Hole 5 Moving body 7 Welding nut 8 Chuck 9 Rod

Claims (1)

(57) [Scope of request for utility model registration] In a vertical plate-shaped workpiece having a horizontal hole, chuck means for receiving a welding nut sent by an air tube is provided, and the chuck means moves the welding nut in a direction perpendicular to a horizontal axis direction. The welding nut is positioned by a positioning pin that can be fed back and forth by a cylinder from the center of one of the electrodes passing through the horizontal hole through an extension of the center line of the horizontal hole. Then, the welding nut is pressed, released from the chuck means and pressed against the other movable side electrode corresponding to the positioning pin, and further, the welding nut is vertically sandwiched between the positioning pin intermediate conical portion and the movable side electrode. A welding nut feeding device that feeds plate-shaped workpieces.