JPS5929807Y2 - Light alloy spot gun arm pivot structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pivoting structure for a spot gun arm for a welding machine made of a light alloy such as an aluminum alloy.

Spot gun arms have traditionally been made of brass.

Therefore, the weight is large and the cost is also high.

Particularly inconvenient due to the large weight is that when automating a welding line and mass producing it, a heavy arm will cause vibration, making it difficult to maintain the accuracy of the dot position, and performing accuracy control etc. will reduce the line speed. Not suitable for mass production.

In addition, when a handgun is heavy, work efficiency decreases.

Therefore, the present applicant has provided a spot gun arm made of a light alloy such as an aluminum alloy in place of the above-mentioned brass spot gun arm, thereby making it possible to reduce the weight and cost of the gun arm.

By the way, the type of spot welding such as a spot gun arm that grips a workpiece and performs spot welding requires seven sets of gun arms to be pivoted so that they can be opened and closed, and since the pivot joints are made of aluminum alloy, each point of the gun arm is Repeated rotation and sliding of the pivot joint may cause wear and tear, which may reduce durability.

Furthermore, the joint portion with the air cylinder unit that drives the gun arm to open and close has a similar problem in terms of durability.

The inventors of the present invention have devised the present invention in order to solve the problems with aluminum alloy spot gun arms such as those on the ground.The purpose of this invention is to A collar having an H-shaped cross-section and a support shaft insertion hole in the center is interposed, consisting of a portion interposed between the support shaft and the axial end face of the pivot joint portion, and a portion interposed between the axial end faces of the pivot joint portion. A cylindrical collar is interposed between the outer pivot joint and the support that sandwich this part, and the collar interposed between the pivot joint and the support shaft prevents seizure and wear. To provide a pivot joint structure for a spot gun arm made of light alloy, which improves life and durability.

Next, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a Bota Glumebe spot gun 1. The gun 1 consists of a pair of arms 2, 3, each of which has an electrode tip 4, 4 at its tip, which can be opened and closed at a pivot point 5. An air cylinder unit 6 for opening/closing drive is interposed between the rear sides of the opening/closing drive.

Figure 2 is a cross-sectional view of the pivot joint, with one arm 2 facing the middle.
It consists of a branch piece 2a, and two branch pieces 3a and 3b of the other arm 3, which are provided so as to sandwich the branch piece 2a, and each branch piece is provided with concentric stop holes 2c, 3c, and 3c, and a pin is attached to the branch pieces 3a and 3b. 7, insert the inner end surface of the pin head 7a into the outer surface of the branch piece 3a, apply the washer 8 to the outer surface of the branch piece 3b, protrude outward from the branch piece 3b, and screw the threaded part 7bK nut 9 of the tahin γ. Then, the pivot parts 2a, 3a, 3b of the arms 2, 3 are pivotally connected by pins T,
The arms 2 and 3 can be pivoted to open and close using a pin T as a fulcrum.

A collar 10 is fitted between the inner diameter part of the stop hole 2c of the intermediate support piece 2a and the outer peripheral part of the pin 7. The disc flange 10b is bent into a shape.

10c, the flange portions 10b, 10c are in contact with both axial end surfaces 2d, 2dK of the support piece 2a, and each axial inner end surface 3d, 3d of the support pieces 3a, 3b on both sides and the both end surfaces 2d, Intervening between 2d.

A cylindrical collar 11.11 is interposed between the stopper hole 3c of the outer support pieces 3a, 3b and the pin 7.

Furthermore, a grease injection groove 1 is provided in the central portion 10a of the collar 10.
0d, supply grease between the pin outer circumference and the collar,
Lubrication shall be provided.

As described above, sliding friction between aluminum alloy members and pins can be avoided, and the early progress of seizure and wear can be avoided, and sliding can be made even smoother by injecting grease.
The wear prevention effect can be further improved, and the life and durability can be significantly improved.

Furthermore, the pivot joint 12 between the cylinder unit 6 and the arms 2 and 3,
13 also has a similar structure.

By the way, regarding the material of the collar, since the gun arm is made of aluminum alloy, if the collar is made of a copper alloy, the material has a strong affinity with the aluminum alloy.
Adhesive seizure occurs during use.

Therefore, iron-based materials are preferable to aluminum alloys because they have relatively good adhesion resistance! Yes.

As detailed above, according to the present invention, it is possible to prevent seizure and wear of the pivot joint of the aluminum alloy spot gun arm, improve the lifespan and durability of this part, and by extension the lifespan and durability of the gun arm. The above can be achieved by simply interposing an H-shaped collar and a cylindrical collar, and there are many advantages such as being able to put into practical use an aluminum alloy spot gun arm that has a simple structure and reduces the weight and cost of the spot gun arm.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the spot gun, and FIG. 2 is an enlarged sectional view of the pivot joint. In the drawings, 2 and 3 are gun arms, 2a, 3a, and 3b are pivot parts, T is a support shaft, 10 is an H-shaped collar, and 11 is a cylindrical collar.

Claims (1)

[Scope of utility model registration request] A support shaft is provided in the center with an H-shaped cross-section consisting of a support shaft in the intermediate pivot joint, a portion interposed between the support shaft, and a portion interposed between the axial end faces of the intermediate pivot joint and other pivot joints. A pivoting structure for a light alloy spot gun arm, characterized in that a collar having an insertion hole is interposed, and a cylindrical collar is interposed between the support and another pivoting section sandwiching the intermediate portion.