JPH0723108Y2 - Welding gun power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a power supply device for a welding gun mounted on a welding jig or the like of an automobile body.

(Prior Art) Conventionally, as a welding gun of this type, according to Japanese Utility Model Publication No. 58-23492, a fixed gun arm is fixed to a gun main body that is vertically movable on a machine base composed of a jig main body of a welding jig. In addition, a movable gun arm that is opened and closed with respect to the fixed gun arm is provided above the fixed gun arm, and the movable gun arm is first brought into contact with the upper surface of the work by the closing operation of the movable gun arm, and then the contact reaction force. It is known that the gun main body is pulled up by the above to bring the fixed gun arm into contact with the lower surface of the work, and the work is spot-welded by energizing both the gun arms while the work is clamped from above and below by the gun arms. ing. In this structure, the gun body is provided with a terminal portion connected to the fixed gun arm, and the terminals of both ends of the feeding cable composed of a coaxial cable connected to the welding transformer are provided at the terminal portion with an insulating material interposed therebetween to form a single pole. The terminal is in contact with the terminal part, and the outer surface of the terminal of the other pole is fastened together so that the ounce copper plate connected to the movable gun arm is superposed, and the fixed gun arm and the other pole of the other pole are connected from the terminal of the one pole through the terminal part. Power is supplied from the terminal to the movable gun arm via an ounce copper plate.

(Problems to be solved by the invention) By the way, when welding a thick plate or an aluminum plate, it is necessary to increase the welding current considerably. Therefore, the power feeding cable has a large diameter with a large current-carrying capacity. Since the rigidity is high and the power supply cable is connected to the terminal part of the gun body as described above, the lifting and lowering operation of the gun body is obstructed, and it is necessary to enlarge the pressurizing cylinder of the gun. It causes a problem such as deterioration of quality.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power supply device capable of performing an opening / closing operation of a movable gun arm and a lifting / lowering operation of a gun body without moving a power supply cable in order to eliminate such a problem.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a fixed gun arm is fixedly mounted on a gun body supported on a machine base so as to be vertically movable, and the fixed gun arm is provided above the fixed gun arm. In a power supply device for a welding gun that is provided with a movable gun arm that is opened and closed with respect to the terminal part connected to a fixed gun arm, which is fixed to the gun body by being positioned below the tail end of the movable gun arm, and below the terminal part. And a support member fixed to the machine base and fastened together with a pair of vertical and longitudinal terminal plates that are superposed on the support member via an insulating material.
The upper end of the inner terminal plate is connected to the lower end of the first flexible power feeding member having the upper end connected to the terminal portion in the up-down direction, and the outer terminal plate is insulated with the first flexible power feeding member. The upper end of this extension is extended along the outside of the member, the upper end of which is connected to the tail end of the movable gun arm, and the lower end of a second flexible power supply member that is long in the up-down direction is connected, and A power supply cable connected to a welding transformer is connected to the lower ends of both terminal plates.

(Function) Since the power supply cable is connected to the terminal plate fixed to the machine base, the power supply cable does not move when the movable gun arm is opened and closed and the gun body is moved up and down. Power is supplied to the fixed gun arm and the movable gun arm from each terminal plate through each flexible power feeding member, and each power feeding member bends following the opening / closing operation of the movable gun arm and the lifting / lowering operation of the gun body. The operation of the gun body is not hindered by the power feeding member.

Further, even if a pair of flexible power supply members are provided, both power supply members are disposed on one side of the gun body along the gun body with good space efficiency, so that the welding gun does not become large.

Furthermore, since the outer terminal plate is extended upward together with the insulating material along the outer side of the first flexible power supply member that connects the inner terminal plate to the inner terminal plate, this extended portion connects to the outer terminal plate. It functions as a member that separates the second flexible power supply member and the first flexible power supply member, and even if both flexible power supply members are bent, they do not come into contact with each other and a short circuit accident does not occur.

(Embodiment) Referring to FIG. 1, (1) shows a machine base composed of a jig main body of a welding jig, (2) shows a support column erected on the machine base (1),
An upper plate (3) laterally overhanging at the upper end of the column (2) and an arm-shaped supporting member (4) extending laterally at the lower part of the column (2) are attached to the supporting member (4). As shown in FIGS. 2 and 3, a lower plate (5) facing the upper plate (3) is attached, and a pair of guide bars (6) ( 6) was erected, and the gun body (7) of the welding gun was supported by the guide bars (6) and (6) so as to be movable up and down.

More specifically, as shown in FIG. 4, the gun body (7) includes a gun bracket (8) consisting of a pair of left and right side plates (8a), (8a), and a pressure bracket suspended from the gun bracket (8). Cylinder (9)
And a pair of guide sleeves (10) and (10) for inserting the guide bars (6) and (6) on the outer surface of the pressurizing cylinder (9), the gun body (7) The guide bar (6) at the guide sleeve (10) (10)
(6) was supported so that it could be raised and lowered.

The gun bracket (8) has a fixed gun arm (11) bolted between its side plates (8a) and (8a) as shown in FIG.
And a pair of upper and lower guide pins (12a) engaging with the cam grooves (8b) (8b) formed in the side plates (8a) (8a) between the side plates (8a) (8a). An arm holder (12) to which (12a) is attached is provided, and an upper movable gun arm (13) facing the fixed gun arm (11) is attached to the upper surface of the arm holder (12), and the arm holder (12) is attached. The upper end of the piston rod (9a) of the pressure cylinder (9) is connected to the lower guide pin (12a) of the pressurizing cylinder (9), and the movable gun arm (13) is cammed by the upward and downward movements of the piston rod (9a). An upward opening operation and a downward closing operation, which are guided by the groove (8b), are provided, and the gun body () is provided between the guide sleeves (10) and (10) on the outer surface of the pressurizing cylinder (9). 7) The lifting cylinder (14) is formed and the piston rod (14a) of the cylinder (14) is attached. When the movable gun arm (13) is closed by contacting the adjusting screw (14b) attached to the lower plate (4) and moving the piston rod (9a) of the pressure cylinder (9) downward. A pressure fluid is introduced into the upper chamber of the working cylinder (14) to push up the gun body (7), and the electrode tip (13a) at the tip of the movable gun arm (13) and the electrode tip (at the tip of the fixed gun arm (11) ( The work W is clamped from above and below with 11a).

The gun bracket (8) has a power supply plate (11b) connected to the fixed gun arm (11) as shown in FIGS. 5 and 6.
Is fixed, and the terminal portion (1
1c) is located below the tail end of the movable gun arm (13), and an insulating material (19) is sandwiched and superposed on the tip of the support member (4) located below the terminal (11c). A pair of inner and outer terminal plates (15 ₁ ) (15 ₂ ) that are long in the vertical direction are provided between the inner terminal plate (15 ₁ ) and the support member (4) with another insulating material (1
9) Tighten them together with the interposition, and then both terminal plates (15 ₁ ) (15 ₂ )
A pair of power supply cables (16 ₁ ) (16 ₂ ) connected to a welding transformer (not shown) were connected to the lower end of each.

The upper end of the inner terminal plate (15 ₁ ) is connected to the lower end of a vertically elongated first flexible power supply member (17 ₁ ) made of an ounce copper plate whose upper end is connected to the terminal portion (11c). There is. Also,
The outer terminal plate (15 ₂ ) along with the insulating material (19) is extended upward along the outer side of the first flexible power feeding member (17 ₁ ), and the movable gun arm (13) is attached to the upper end of this extension. A lower end of a _second flexible power feeding member (172) which is made of an ounce copper plate and has an upper end connected to a tail end is connected to the lower end to connect both the first and second flexible power feeding members (17 _1). ) (17 ₂ ) is installed on one side of the gun body (7) along the gun body (7) with good space efficiency and separated from each other by the extension of the outer terminal plate (15 ₂ ). I got it. Then, the fixed gun arm (11) and the other feeding cable (16 ₂ ) from _one feeding cable (16 ₁ ) via the terminal plate (15 ₁ ), the feeding member (17 ₁ ) and the feeding plate (11 b).
From the terminal plate (15 ₂ ) and the power supply member (17 ₂ ) to the movable gun arm (13), thereby energizing the electrode tips (11a) (13a) and spot welding the workpiece W. To do. These power supply members (17 ₁ ) (17 ₂ ) bend as the gun body (7) moves up and down and the movable gun arm (13) opens and closes, but the power supply cables (16 ₁ ) (16 ₂ ) Even if the cable (16 ₁ ) (16 ₂ ) does not move together and thus has a large diameter with a large current-carrying capacity, the gun body (7) and the movable gun arm (13) do not move with the cable (16 ₁ ) (16 ₂ ) Moves smoothly without being disturbed.

In the figure, (18) is the piston rod (9) of the pressure cylinder (9).
The stopper (19) integrated with the upper plate (3) that abuts against the step surface (9b) formed in (a) and restricts the upward movement of the piston rod (9a) at a fixed position, and (19) indicates an insulating material.

(Effect of the Invention) As is apparent from the above description, according to the present invention, the power supply cable does not move when the movable gun arm is opened and closed and the gun body is moved up and down, and the power supply cable has a large diameter and a large diameter. In addition, the movable gun arm and the gun body can be operated smoothly, the pressurizing cylinder of the gun does not have to be upsized, the durability of the power supply cable is improved, and a pair of flexible power supply members are provided. However, it is possible to dispose the power feeding members in a state of being separated from each other on one side of the gun body along the gun body with good space efficiency, and it is possible to suppress an increase in size of the entire welding gun.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of an example of a welding gun equipped with the device of the present invention, and FIGS. 2 to 6 are lines II-II to V of FIG. 1, respectively.
It is a sectional view taken along the line I-VI. (1) …… Machine stand (4) …… Supporting member (7) …… Gun body (11) …… Fixed gun arm (13) …… Movable gun arm (15 ₁ ) (15 ₂ ) …… Terminal board (16 ₁ ) (16 ₂ ) …… Power supply cable (17 ₁ ) (17 ₂ ) …… Flexible power supply member

Claims (1)

[Scope of utility model registration request] 1. A welding gun comprising a fixed gun arm fixedly mounted on a gun main body supported on a machine stand, and a movable gun arm opened and closed relative to the fixed gun arm above the fixed gun arm. In the power feeding device, a terminal portion that is located below the tail end portion of the movable gun arm and is fixed to the gun body, is connected to the fixed gun arm, and a support member that is located below the terminal portion and is fixed to the machine base is provided. A pair of terminal plates, which are long and thin in the up-down direction and are superposed on the support member via an insulating material, are fastened together, and the upper end of the inner terminal plate is connected to the upper end to the terminal portion. The lower end of the flexible power feeding member is connected, and the outer terminal plate is extended upward along the outer side of the first flexible power feeding member together with the insulating material, and the upper end of the extension portion is movable gun arm. Connected to the tail end of Connect the lower end of the longitudinal second flexible power supply member in a downward direction, and the feeding device of the welding gun, characterized in that connecting a power supply cable connected to the welding transformer to the lower ends of the terminal plates.