JPH073872U - Power supply terminal device for gun arm in welding gun - Google Patents

Abstract

(57) [Summary] [Structure] A screw hole 7 communicating with the arm cooling water hole 6 is formed at the tail end of the gun arm 1 of the welding gun, and the power supply terminal 4 for connecting the power supply conductor 5 is screwed into the screw hole 7. It is coupled to the gun arm 1 via the mating screw member 8. A terminal cooling water hole 1 connected to a power supply terminal 4 and a hose joint 9 ₁ screwed to the power supply terminal 4.
The cooling water holes 6 and 10 are communicated with each other through the shaft hole 8c formed in the screw member 8. [Effect] A screw member, which is a connecting member for both the gun arm and the power supply terminal, can also be used as a water-passing joint to continuously pass cooling water, reducing the number of parts of all parts including a hose joint and a hose, Cost reduction and weight reduction can be achieved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power supply terminal device for a gun arm of a welding gun.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, in an X-type welding gun, as shown in Japanese Patent Laid-Open No. 3-285776, a power supply terminal is provided at the tail end of the gun arm so as to project laterally, and a conductor for power supply is connected to the terminal. The conductors do not interfere with the gun arm opening / closing mechanism. In this case, the power supply terminal may be cast-molded integrally with the gun arm, but this complicates the mold and increases the manufacturing cost. Therefore, in general, a separate power supply terminal is connected to the gun arm. When connecting the power supply terminals, a seat surface for the power supply terminals is countersunk at the tail end of the gun arm, and the power supply terminals are bolted to the seat surface. In addition, since the power supply terminal generates heat as well as the gun arm when energized, cooling water holes are formed in the gun arm and power supply terminal respectively, and a cooling water hose for inflow and outflow is connected to the gun arm and also flows into the power supply terminal. The cooling water hoses for water supply and outflow are connected to allow cooling water to flow through each cooling water hole.

[0003]

[Problems to be solved by the device]

 In the above conventional example, it is necessary to process the seating surface for the power supply terminal, which increases the number of steps.In addition, it is necessary to provide hose joints for inflow and outflow for the gun arm and the power supply terminal, respectively. However, there is a problem that the handling of the cooling water hose becomes complicated. In view of the above points, the present invention makes it possible to connect the power supply terminal to the gun arm by a simple process with good power supply efficiency, and to connect the cooling water hole of the gun arm and the cooling water hole of the power supply terminal to each other to form a hose joint or The aim is to provide a device that allows the number of hoses to be reduced.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention relates to a welding gun, in which a power supply terminal for connecting a power supply conductor is connected to a gun arm, and a screw for communicating with an arm cooling water hole formed in the gun arm at the tail end of the gun arm. A hole is opened, the power supply terminal is connected to the gun arm through a screw member that is screwed into the screw hole, a shaft hole is formed in the screw member, and the terminal cooling water hole formed in the power supply terminal is formed in the shaft hole. It is characterized in that it is connected to the arm cooling water hole via.

[0005]

[Action]

 The contact area between the gun arm and the power supply terminal can be secured widely by the screwed part of the screw member with respect to the screw hole without the need to machine the seat surface for the power supply terminal on the gun arm, and the power can be efficiently supplied from the power supply terminal to the gun arm. Also, if a hose joint for inflow is provided on one side of the gun arm and the power supply terminal and a hose joint for outflow on the other side, a screw member also serves as a water passage joint for the arm cooling water hole and the terminal cooling water hole. As a result, cooling water can be continuously supplied, and the number of hose joints and hoses used can be reduced.

[0006]

【Example】

 Referring to FIG. 1, reference numeral 1 denotes a copper gun arm for an X-type welding gun, which has a mounting portion 2 for an arm holder pivotally supported by a gun bracket formed at the tail end of the gun arm 1 and a tip of the gun arm 1. Attach an electrode 3 that contacts the workpiece to the gun arm 1, connect a block-shaped copper power supply terminal 4 to the side of the tail end of the gun arm 1, and supply a power supply conductor 5 composed of an ounce copper plate connected to a power supply such as a welding transformer. The gun arm 1 was connected to the terminal 4 and fed from the conductor 5 through the feeding terminal 4.

As shown in FIGS. 2 and 3, the gun arm 1 is formed with a pair of upper and lower arm cooling water holes 6, 6 for the forward path and the backward path, and is formed on the side surface of the tail end portion of the gun arm 1. A screw hole 7 communicating with the lower arm cooling water hole 6 is opened, and a copper screw member 8 having screw portions 8a and 8b is provided at both ends, and the screw portion 8a at one end of the screw member 8 is screwed. The power supply terminal 4 was screwed into the hole 7 and the screw portion 8b at the other end, and the power supply terminal 4 was connected to the gun arm 1 through the screw member 8.

The power supply terminal 4 is formed with a terminal cooling water hole 10 connected to a hose joint 9 ₁ screwed to the outer surface thereof, and the screw member 8 is formed with a shaft hole 8 c so that the terminal cooling water hole 10 is formed. Is connected to the above-mentioned lower arm cooling water hole 6 through the shaft hole 8c, and is further connected to the tail end of the gun arm 1 to the upper arm cooling water hole 6 as shown in FIG. ₂ is screwed, and hoses 11 are connected to the terminal side hose joint 9 ₁ and the arm side hose joint 9 ₂ respectively to supply and drain water, so that the screw member 8 serves as a water passing joint and the arm cooling water hole 6 and the terminal cooling water. Cooling water was allowed to flow continuously to the holes 10. The screw member 8 is formed as a pipe screw so that water leakage can be prevented without using a sealing member such as an O-ring.

The conductor 5 is fastened to the power supply terminal 4 by a bolt 12 that is screwed into the screw hole 4a of the power supply terminal 4 through a mounting hole 5a at the end thereof. Here, the power supply terminal 4 is in contact with the gun arm 1 with a wide surface contact at the threaded portion of the screw member 8 and the screw hole 7, and the power supply terminal 4 does not have to be machined to form a seating surface for the power supply terminal 4. Power can be efficiently supplied from 4 to gun arm 1.

FIG. 4 shows another embodiment, in which the screw member 8 is integrally molded with the power supply terminal 4, and the power supply terminal 4 is further provided with a screw hole 4a for fastening a conductor and a shaft hole 8c of the screw member 8. the formed terminal coolant hole 10 to communicate, also serves as a bolt 12 for conductors fastened to the terminal-side hose joint 9 _1, and so obtain perform water flow for the terminal coolant holes 10.

According to this, the number of parts can be reduced as much as possible, and further cost reduction and weight reduction can be achieved. The bolt 12 is preferably formed as a pipe thread so that water leakage from the conductor fastening portion can be prevented without using a seal member.

[0012]

[Effect of device]

 As is apparent from the above description, according to the present invention, it is possible to connect the power supply terminal to the gun arm efficiently by simply processing the screw hole without processing the seat surface for the power supply terminal on the gun arm. Both the power supply terminal and the screw member, which is a connecting member for both, can also be used as a water joint to continuously pass cooling water, reducing the number of parts for all parts including the hose joint and hose, and reducing costs and weight. And the handling of the hose can be simplified.

[Brief description of drawings]

FIG. 1 is a perspective view of an example of a gun arm including the device of the present invention.

2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view of the disassembled state.

FIG. 4 is an exploded perspective view of another embodiment.

[Explanation of symbols]

 1 Gun Arm 4 Power Supply Terminal 5 Conductor 6 Arm Cooling Water Hole 7 Screw Hole 8 Screw Member 8c Shaft Hole 10 Arm Cooling Water Hole

Claims (1)

[Scope of utility model registration request] 1. In a gun arm of a welding gun, to which a power feeding terminal for connecting a power feeding conductor is connected, a screw hole communicating with an arm cooling water hole formed in the gun arm is formed at the tail end of the gun arm, and The power supply terminal is connected to the gun arm through a screw member that is screwed into the screw hole, and a shaft hole is formed in the screw member so that the terminal cooling water hole formed in the power supply terminal is provided through the shaft hole. A power supply terminal device for a gun arm in a welding gun, which is characterized in that