JPH1094881A - Spot welding attachment for robots - Google Patents

Abstract

(57) [Problem] To provide a spot welding attachment for a robot capable of easily and efficiently performing spot welding with a simple structure without being limited by the size of an object to be welded. SOLUTION: An arm 2 provided on a robot body 1 has a holder 3
And a fluid cylinder 4 is provided on the holder 3 so as to be movable left and right, and the fluid cylinder 4 is provided with piston rods 6 ₁ and 6 _2.
Are provided opposite to each other, and this one piston rod 6 ₁
The projecting distal portion ₆₁ 'to provide a one spot welding chip 5, the other of the piston rod 6 _second protrusion tips 6 _2' pairs of fixed those body a at predetermined intervals in the fuselage outside position facing The other spot welding tip 7 for spot-welding the workpieces c and c 'at predetermined intervals outside the fuselage at the position opposite to the tip end 5' of the spot welding tip 5 is fixed oppositely. Spot welding attachment for robots.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spot welding attachment for a robot.

[0002]

2. Description of the Related Art A conventional spot welding robot employs a structure in which a transformer is also incorporated in the body, and is large and heavy. Also, for example, a structure in which two sheets to be welded are pressed and welded by a welding tip (electrode) is adopted. All chips are projected from the fuselage.

[0003] Therefore, the size of the object to be welded is limited by the fact that the spot welding operation must be performed within the range of the depth of the body determined by the degree of protrusion of the holder holding the welding tip, that is, the length of the holder. There is a disadvantage that welding of a large workpiece cannot be performed.

According to the present invention, a fluid cylinder is provided on an arm of a robot body, a piston rod is provided on the left and right sides of the fluid cylinder so as to face each other, and a welding tip is provided on a protruding tip of one of the piston rods. Welding tip to be protruded into one piece, opposing welding tip is installed at a predetermined position on the back side of the plate to be welded separately from the fuselage, and the fixed body is separated at the position opposite to the tip of the other piston rod. If provided, the reaction force due to the pressing of the welding tips will not be directly applied to the arm of the robot body, and the present invention will focus on the fact that the size of the workpiece is not limited as in the conventional welding robot. The robot spot welding attachment of the invention was completed.

[0005]

The gist of the present invention will be described with reference to the accompanying drawings.

A holding body 3 is attached to an arm 2 provided on a robot body 1, a fluid cylinder 4 is provided on the holding body 3 so as to be movable left and right, and piston rods 6 ₁ and 6 ₂ are placed on the fluid cylinder 4 in a left-right facing state. to provided, this one of the piston rod ₆₁ of the projecting distal end portion ₆₁ 'of the one in the spot welding tip 5 is provided, the other of the piston rod 6 ₂ projecting tip 6 _2' aircraft outside of the predetermined position facing A fixed body a is opposed to the other at an interval, and the other of the workpieces c and c ′ is spot-welded at a predetermined interval outside the fuselage at a position opposed to the tip 5 ′ of the spot welding tip 5. The present invention relates to a spot welding attachment for a robot, in which a spot welding tip 7 is fixed oppositely.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings, which are examples of embodiments, showing the functions and effects.

[0008] Piston rod ₆₁ of the left and right by pressing the fluid into the fluid cylinder 4, 6 ₂ of the projecting distal end portion 6 ₁ ', 6 _2' when allowed to protrude, one of the piston rod ₆₁ of the spot welding tip 5 Cooperates with the other spot welding tip 7 that is fixed to the outside of the machine in proximity to the workpieces c and c ′.
Spot welding c '.

[0009] At this time stationary those body a in contact with that other piston rod 6 ₂ of the distal end portion 6 ₂ 'for supporting one of the pressing reaction force of the piston rod _61, that no load is on the arm 2.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a preferred embodiment of the present invention, in which a holding body 3 is attached to an arm 2 provided on a robot body 1;
This holder 3 is provided a fluid cylinder 4 freely horizontal movement, the fluid cylinder 4 provided the piston rod 6 _and 62 to the left and right opposing condition, one to the projecting distal end portion ₆₁ 'of the piston rod ₆₁ of the one spot welding chip 5 provided for by oppositely arranged fixed those body a at predetermined intervals in the outboard opposing position of the other of the piston rod 6 _second protrusion tips 6 ₂ ', the spot welding tip 5 The other spot welding tip 7 for spot-welding the workpieces c and c 'at a predetermined interval outside the fuselage at a position opposed to the distal end portion 5'.

In the illustrated embodiment, a holder 3 is attached to an arm 2 provided on a robot body 1 in the form of a channel having an opening at the front, and the left and right vertical sides 3 ', 3' of the holder 3 are provided from the outside. A retainer 13 having a single-flange bushing shape is fitted, and the flange is fixed to the vertical sides 3 ′ and 3 ′ with bolts. The fluid cylinder 4 is provided to be able to move to the left and right with respect to the arm 2 by fitting the cylindrical portion.

A piston rod 6 is provided in the fluid cylinder 4.
_{The first} and _second piston rods 61 are formed in a flange shape, and the _one of the piston rods 61 is formed in a flange shape. Te is fastened the base of the flange shape of the chip holding rod 10 volts, nuts, chips holding rod 10 the spot welding chip 5 provided on the other end, the other of the piston rod 6 ₂ projecting tip 6 ₂ ' The fixed body a is opposed to the body at a predetermined distance away from the body at the opposing position, and the workpiece c is positioned at a predetermined distance outside the body at the position opposite to the tip 5 ′ of the spot welding tip 5. The other spot welding tip 7 for spot-welding c ′ is fixed oppositely. Reference numeral 15 in the drawing denotes a flange with an insulating flange used when the flange provided at the protruding end of _one of the piston rods 61 and the flange provided at the base of the tip holding rod 10 are connected to each other with bolts and nuts. Bushing.

A spring support 8 is provided at the center of the outer cylinder of the fluid cylinder 4, and springs 9, 9 are provided between the left and right side surfaces of the spring support 8 and the vertical sides 3 ', 3'.
And a fluid is press-fitted into the fluid cylinder 4 from the A port of the fluid cylinder 4 to share the spot welding tip 5 of _one piston rod 61 with the other spot welding tip 7 fixed outside the machine. action with dynamic the weld object c, the impact force is operated to the arm 2 when returning the right and left of the piston rod 6 _and 62 by press-fitting the fluid from the B port and the fluid cylinder 4 when spot welding the c ' Is configured to mitigate.

In the drawings, the spot welding attachment of the machine is attached to the arm 2 of the robot main body 1. However, the workability may be further improved by attaching it to a freely movable arm.

The fixing body a is provided so as to be fixed in accordance with the thickness of the workpieces c and c 'and the set position of the other spot welding tip 7.

The spot welding transformer 12 is desirably provided separately from the robot body 1.

[0017]

According to the present invention, as described above, the fluid cylinder is provided on the arm of the robot body, the piston rods are provided on the left and right sides of the fluid cylinder so as to face each other. The welding tip that protrudes from the fuselage is reduced to one piece, and the spot welding tip that is opposed to the fuselage is attached to a predetermined position on the back side of the workpiece separately from the fuselage, so the size of the workpiece is limited. It is possible to perform spot welding without receiving it, and to support the impact reaction force generated at the time of spot welding by contacting the protruding tip of the other piston rod with a fixed body provided separately from the body. The spot for industrial robots that can efficiently perform spot welding work with an extremely simple structure in which impact force is not directly applied to the robot body 1 The contact attachment.

[Brief description of the drawings]

FIG. 1 is an explanatory front view of the present invention.

[Explanation of symbols]

a Fixed body c ・ c ′ Workpiece 1 Robot body 2 Arm 3 Holder 4 Fluid cylinder 5 Spot welding tip 5 ′ Tip 6 ₁ Piston rod 6 _{2 The} other piston rod 6 ₁ ′ Projecting tip 6 ₂ ′ Protruding tip 7 Spot welding tip

Claims (1)

[Claims] 1. A holding body is attached to an arm provided on a robot body, a fluid cylinder is provided on the holding body so as to be movable left and right, and a piston rod is provided on the fluid cylinder so as to face left and right. One tip welding tip is provided at the projecting tip, and a fixed body is provided at a predetermined interval outside the body at a position facing the projecting tip of the other piston rod, and the tip of the spot welding tip is provided. A spot welding attachment for a robot, wherein the other spot welding tip for spot welding an object to be welded is fixed opposite to the outside of the machine body at the opposing position.