JPH0132711Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a sliding energizing joint that can be attached and detached.

[Conventional technology]

As shown in Fig. 1, a conventional sliding current-carrying joint consists of a movable terminal a whose end is shaped into a spherical shape, and a fixed terminal b which has a spherical concave surface into which the spherical surface of the movable terminal fits into surface contact and is housed in a case c. There is a coil spring d that is constantly applied with a constant force to bring the terminals into close contact when electricity is applied between the two terminals.

[Problem that the invention attempts to solve]

Conventionally, the structure was as shown in Figure 1 above, so if the movable terminal and fixed terminal were not in close contact when energizing, an arc would occur on the contact surface, and the arc heat would melt the contact surface and roughen the surface, worsening the energizing effect. . Moreover, if the amount of heat generated is large, the contact surfaces of the two will be welded together.
Therefore, as described above, conventionally, the pressure coil spring is always urged in the direction of close contact with a certain constant force. However, in this case, since force is constantly applied, a considerable external force is required to freely move the movable terminal even when no electricity is applied, which causes problems such as strain on the joint and connected devices.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention reduces the contact resistance between the movable terminal and the fixed terminal when not energized, allows them to move freely with a small force, and uses a fluid that operates at the same time only when energized. It is designed to apply pressure.

[Effect]

Connect the fixed terminal to the transformer, the movable terminal to the welding gun, connect the cylinder port on the welding gun to the switching valve, and branch out this pressurization system.
Connect this to the port in the piston chamber of the joint case, and when you try to weld with a welding gun, switch the switching valve to the pressurized system, and the pressurized fluid will operate the piston of the cylinder installed in the welding gun, While both electrodes are closed, pressurized fluid branched from the pressurizing system is introduced into the piston chamber and presses the fixed terminal toward the movable terminal to bring the contact sliding surfaces into close contact. As a result, current flows to the electrodes of the welding gun and welds the metal interposed between the two electrodes, and when the switching valve is switched, the pressure on the fixed terminal is removed and the pressing force disappears, and the gap between the fixed terminal and the movable terminal is removed. Contact resistance becomes minute and both terminals can be moved freely. In addition, if it is desired to maintain close contact between the two contacts with a certain degree of constant force even when the pressure is released, a pressure coil spring may be added in addition to this as in the conventional method.

〔Example〕

Reference numeral 1 denotes a case serving as a cylinder, and this case 1 is provided with an annular seat 3 on the inner surface near one end to receive the spherical part of a spherical bulge 2' provided at the end of the movable terminal 2, which will be described later. A cover body 5 is screwed into the outer peripheral edge of the cover body 5 by threading a screw 4 thereon. Further, inside the case 1, a piston chamber 6 is formed between the annular seat 3 and the cover body 5.

The movable terminal 2, which has a spherical bulge 2' formed at one end, is inserted into the annular seat 3 from the tip through the piston chamber 6 from the cover body 5, and is movable by receiving a part of the spherical bulge 2'. The terminal 2 is designed to be able to move freely around the bulge 2'.

Further, inside the piston chamber 6, a spherical concave surface 7' that is slidably fitted with the spherical bulging part 2' of the movable terminal 2 is provided at the end, and a large diameter part D that becomes a piston with an O ring 8 fitted on the outer periphery. and a large diameter part D, which becomes a piston of the fixed terminal 7 consisting of a small diameter part d, is fitted integrally with this,
Further, the small diameter portion d is slidably fitted into a hole 5' formed in the cover body 5 via an O-ring 9 to maintain airtightness.

The cover body 5 is provided with a port 10 communicating with the piston chamber 6, and the movable terminal 2 is received by pressing the back surface of the large diameter portion D of the fixed terminal 7 with the fluid sent through the port 10. The spherical concave surface 7' provided on the fixed terminal is tightly fitted into the spherical bulge 2'.

11 is a hole communicating with the piston chamber 6.

FIG. 3 shows another embodiment in which the movable terminal 2 and the fixed terminal 7 are each divided, and an insulating material 12 is placed in the divided portion.
It is designed to be integrally fixed with an intervening part, so that several types of current can be passed through it.

FIG. 4 shows an example of the general use of the current-carrying joint, in which the current-carrying joint is interposed between both electrodes a, b of welding gun A and the transformer 13, and cables 14, 14' and 15,
Please contact me at 15'. At this time, cables 14 and 1
One end of 5 is connected to each fixed terminal 7, 7 in case 1, 1.
And cables 14', 15' are connected to each movable terminal 2, 2.

A cylinder 16 is attached to one arm of the welding gun A, and a rod 16' from the cylinder 16 is connected to the other arm, and the operation of the cylinder 16 opens and closes between the electrodes. The cylinder 16 has a pressurization and discharge port connected to a switching valve 17, and one pressurization system 18 has ports 10, 10 which are branched off 18' and communicated with the piston chamber 6 in each case 1. In the case of welding, when fluid is flowed in the direction of closing the electrode, the fluid is simultaneously introduced into the piston chamber 6, presses the fixed terminal 7 toward the movable terminal 2, and energizes the movable terminal 2 to weld. This is what we do.

[Effect of idea]

In the present invention, the movable terminal 2 received by the annular seat 3 inside the case 1 is designed to move freely around the spherical bulge 2' at the end, and furthermore, the movable terminal 2 is received by the annular seat 3 in the case 1, and can move freely around the spherical bulge 2' at the end. When the fixed terminal 7 having opposing spherical concave surfaces 7' is slid into the piston chamber 6 in the case and fluid is introduced into the piston chamber 6, the fixed terminal 7 is pushed by the fluid and the spherical bulge 2' When the spherical concave surface 7' is fitted, the contact surfaces are in close contact and conduction occurs without arcing.Also, when the pressing force is removed, the contact resistance between the terminals is small and the movable terminals can move freely, and only when energized is applied. Because it is fixed, do not put strain on other devices.
Also, durability can be extended.

Furthermore, since the fixed terminal can operate and energize at the same time as the cylinder of another device (welding gun) and the switching valve switch, fewer machines are used and there are no breakdowns.

[Brief explanation of drawings]

The drawings show an embodiment of the current-carrying joint according to the present invention, and FIG. 1 is a vertical side view of a conventional current-carrying joint;
FIG. 2 is a vertical side view of a current-carrying joint according to the present invention, and FIG. 3 is a vertical side view of a current-carrying joint according to another embodiment.
FIG. 4 is a circuit diagram of an example of use. DESCRIPTION OF SYMBOLS 1... Case, 2... Movable terminal, 2'... Spherical bulge, 3... Annular seat, 4... Screw, 5... Cover body, 5'... Hole, 6... Piston chamber, 7...
Fixed terminal, 7'... Spherical concave surface, 10... Port,
12...Insulating material, 16...Cylinder, 17...Switching valve, D...Large diameter portion, d...Small diameter portion.

Claims (1)

[Claims for Utility Model Registration] (1) An annular catch is integrally provided on the inner surface near one end of the case, and a cover body is provided on the other end, and the interior between the annular catch and the cover body is used as a piston chamber. The annular seat of this case receives the spherical bulge at one end of the movable terminal inserted through the piston chamber, and the piston chamber consists of a large diameter part and a small diameter part, and The large diameter part of the fixed terminal, which has a spherical concave surface that fits with the spherical bulge on the end face of the large diameter part, is slidably fitted as a piston, and the small diameter part is slid into a hole drilled in the cover body attached to the case. A current-carrying joint that fits in and connects the piston chamber with a port that introduces fluid from the outside. (2) The current-carrying joint according to claim 1, wherein the fixed terminal and the movable terminal are each divided, and an insulating material is interposed between the divided portions. (3) The port leading to the piston chamber in the case is connected to a pressurizing system of a cylinder operated by another device connected to the switching valve, so that the pressure system is connected to the switching valve so that the pressure system can be introduced and operated simultaneously with the operation of other cylinders. A current-carrying joint according to claim 1 of the utility model registration claim.