JP2539229Y2 - Arc stud welding machine - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an arc having a plurality of levers which can be opened and closed, and an arc shield divided body formed by dividing a cylindrical arc shield into a plurality of parts at the lower end of each lever. Related to stud welding machine.

[0002]

2. Description of the Related Art In arc stud welding, a cylindrical arc shield (ferrule) 2 is conventionally used as shown in FIG. When the stud 4 is welded to the material 6 to be welded, the arc shield 2 is fitted to the stud 4 as shown in the drawing to cover the welded portion of the stud 4 (the lower end of the stud 4). Shut off the weld from outside air.

As an example of arc stud welding using the above-mentioned arc shield, for example, as described in JP-A-59-141379 and JP-A-60-181269, a plurality of cylindrical arc shields are used. The two arc shield divided bodies are held by a welding machine so as to be able to approach and separate from each other, and the two arc shield divided bodies are brought close to each other and abutted to form a cylindrical arc shield. A method has been proposed in which the arc shield is used to cover the welded portion of the stud as shown in FIG. 7 and to perform arc stud welding. After the welding is completed, the two arc shield split bodies are separated to remove the arc shield from the welded stud. I have. According to such a method, arc stud welding can be repeatedly performed a plurality of times by the same arc shield.

FIG. 8 shows an example of an arc stud welding machine using a plurality of divided arc shields as described above.
The following can be considered. The illustrated arc stud welding machine opens and closes by turning the handle 10 up and down.
At the lower end of the lever 12, an arc shield holding portion 14 is attached by vertically holding the step portion 12a of the lever 12 and a nut 20 screwed to the lower end of the lever 12. Each of the arc shield holders 14 holds an arc shield split body 16 in a vertical direction between a projection formed on an inner surface of the holder main body 17 and a holder 18. The arc shield split body 16 has a substantially semi-cylindrical shape as shown in FIG. 1 described below.

[0005] Arc stud welding by the above welding machine is performed as follows. First, the handle 10 is rotated upward from a position shown by a solid line in FIG. 8 to a position shown by a broken line,
By doing so, the two levers 12 are opened to the open state shown by the broken lines, and thereafter the head of the stud 4 is gripped by the chuck 28 provided at the tip of the welding gun 26. Next, the handle 10 is pivoted downward so that both levers 12
Is closed to return to the original closed state shown by the solid line. In this closed state, the two arc shield split bodies 16 are in contact with each other to form a cylindrical arc shield, and the stud 4 is inserted into the arc shield. Subsequently, the welding machine is lowered from this state, and the lower end of the stud 4 and the lower end of the arc shield split body 16 are brought into contact with a predetermined position of the workpiece 6 to perform welding. After welding is completed, the handle 10 is turned upward to open the lever 12, and thereafter, arc stud welding is repeated in the same manner.

[0006]

[Problems to be Solved by the Invention] By the way, for example, in a construction site or the like, tens or hundreds of studs are often welded continuously, and at that time, arc stud welding is repeatedly performed many times. The arc shield split 16 is eroded or damaged by the molten metal therein, and it becomes necessary to replace the arc shield split 16 with a new one during welding.

In such a case, a method of replacing only the arc shield split body 16 with a new one while leaving the arc shield holding section 14 as it is, or separately preparing an arc shield holding section 14 holding the new arc shield split body 16 is prepared. It is conceivable to replace the arc shield holding part with a new one. However, during continuous arc stud welding, the arc shield split body 16 is required.
The vicinity is extremely hot, so it is difficult to replace the arc shield split body 16 and the arc shield holding portion 14 as described above.

Therefore, as in the welding machine described above, the lever 12 is divided into an upper lever portion 22 and a lower lever portion 24, which are detachably connected to each other. A method in which an assembly of the unit 24, the arc shield holding unit 14, and the arc shield split body 16 is prepared, and the entire lower lever unit 24 is replaced is considered. According to this method, the arc shield split body can be safely and easily replaced even when the temperature near the arc shield split body is high.

However, the upper and lower levers 24 and 24 are detachably connected to each other by inserting the upper end of the lower lever 24 into a lever insertion hole 22a formed in the upper lever 22 as shown in FIG. When the lever portion 24 is pressed, the pressing by the screw 22b presses one point on the lower lever portion 24. Therefore, if one screw 22b is used, the pressing is insufficient and a reliable connection is obtained. Instead, it is necessary to press with at least two screws 22b as shown.

Therefore, in the above connection structure, when replacing the arc shield split body 16, it is necessary to loosen or tighten the two screws 22b to attach and detach the lower lever portion 24. In addition, the amount of the screw is large and cumbersome, and the connecting portion itself is relatively small. Therefore, if the two screws 22b are provided, the screws themselves become inevitably small, and such small screws are inconvenient to handle and lost. Therefore, there is a problem that the workability of attaching and detaching the lower lever portion 24, that is, the workability of replacing the lower lever portion 24 is not good.

In view of the above circumstances, an object of the present invention is to provide an arc stud welding machine which can safely and easily replace an arc shield divided body and has good replacement workability.

[0012]

In order to achieve the above object, an arc stud welding machine according to the present invention is provided with a plurality of levers which can be opened and closed, and a cylindrical arc shield is provided at the lower end of each lever. An arc stud welding machine to which an arc shield split body formed by dividing into a plurality of parts is attached, wherein each of the levers is divided into an upper lever part and a lower lever part, and one of the two lever parts is provided. A connecting portion is provided on one lever portion, and the connecting portion includes
A lever insertion hole for inserting the other lever portion, a plate-shaped slit connected to the lever insertion hole in a plan view and extending a predetermined length in the longitudinal direction of the lever insertion hole, and opposed to each other with the slit of the connection portion interposed therebetween; Pressing means for pressing the slit opposing portions to approach each other are provided,
The two lever portions are connected by inserting the other lever portion into the lever insertion hole and pressing the slit-facing portions toward each other by the pressing means.

[0013]

In the arc stud welding machine, when the slit-facing portion is pressed by the pressing means, the pressing force is transmitted to the entire lever insertion hole via the slit-facing portion, and the other lever is pushed over the entire lever insertion hole. The two lever portions are connected by pressing and holding the portions. When the pressing by the pressing means is released, the pressing and holding of the other lever by the lever insertion hole is released, and both levers can be detached.

That is, in the arc stud welding machine, as described above, the lever is divided into an upper lever portion and a lower lever portion, and these are detachably connected to each other. Therefore, the lower part of the arc shield can be replaced at the time of replacement of the arc shield divided body, so that the replacement can be performed safely and easily even when the temperature near the arc shield divided body is high.

The two levers are connected by inserting the other lever into the slit-inserted lever insertion hole of the connecting portion provided on one lever, and bringing the slit-facing portions closer to each other by the pressing means. To connect the two lever portions.

In the above connection, the pressing force of the pressing means is transmitted to the entire lever insertion hole via the slit opposing portion. Therefore, even if there is only one pressing means and it applies a pressing force locally to the slit-facing portion, for example, only one screw as in the embodiment described later, the lever insertion hole can be used. As a whole, the other lever portion can be securely pressed and clamped, and only one pressing means is required. Therefore, a relatively large pressing means, for example, a relatively large screw can be used.

Accordingly, in the arc stud welding machine configured as described above, only one pressing means is required and a relatively large pressing means can be used, so that the amount of work at the time of replacement can be reduced and The operation of the pressing means is simple, and the replacement workability is good.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an arc shield split body used in an embodiment of an arc stud welding machine according to the present invention. Arc shield split 30 shown
Is formed by dividing a substantially cylindrical arc shield made of ceramics having excellent thermal shock resistance into two, each of which has a substantially semi-cylindrical shape.

On the lower surface of the arc shield split body 30,
A plurality of communication grooves 32 having a predetermined opening area for communicating gas between the inside and outside of the arc shield at the time of welding to perform degassing are formed,
The inner surface 34 forms a stud insertion hole slightly larger than the outer diameter of the stud 80 as shown in detail in FIG. A concave portion 38 for holding the shield holding portion is formed.

FIG. 2 shows an embodiment of the present invention, in which an arc stud welding machine for performing arc stud welding using the arc shield split body 30 is shown. FIG. 3 is a right side view of the welding machine shown in FIG. FIG.

The illustrated welding machine 42 includes a base 44, a pair of levers 50 rotatably supported via fulcrum pins 48 on two legs 46 fixed to the base 44, and a pair of levers 50. One end of the link 50 is rotatably connected to the upper end of the lever 50 via a joint pin 52, and the other end is rotatably connected to the upper end of the lever 50 via a joint pin 54. A handle 58 fixed to one end and extending in the left-right lateral direction (the direction of arrow B in FIG. 2) and a joint pin 54 connecting the other ends of the two links 56 are inserted through and up and down (the direction of arrow C in FIG. 2).
Elongate hole member having an elongate hole 60 extending therethrough and fixed to the base portion 44
62, a welding gun 66 attached to a pair of rods 64 erected on the base 44, a chuck 68 for holding the head of a stud 80 provided at the lower end of the welding gun 66, A welding machine body comprising a handle 70 having a welding switch 69 provided on the welding gun 66 is also provided.

An arc shield holder 72 is detachably attached to the lower end of each lever 50 of the welding machine main body.
30 are held respectively. The lever 50 can be opened and closed as shown by a broken line in the figure, and the opening and closing of the lever 50 is performed by rotating the handle 58 in the vertical direction.

The arc stud welding by the welding machine 42 is performed as follows. First, the handle 58 is pivoted upward from the position shown by the solid line in FIG. 2 to the position shown by the broken line, thereby opening the two levers 50 to the open state shown by the broken line.
Grab 80 head. Next, the handle 58 is rotated downward, thereby closing both levers 50 to return to the original closed state shown by the solid line. In this closed state, each lever 50
The arc shield holding portions 72 provided in the abutting each other, the arc shield split bodies 30 also abut each other to form a cylindrical arc shield, and a state in which the stud 80 is inserted in this arc shield. Has become. Subsequently, from this state, the welding machine 42 is lowered to bring the lower end portion of the stud 80 and the lower end surface of the arc shield split body 30 into contact with a predetermined position of the workpiece 82, and the switch 69 is pressed to perform welding. . After welding is completed, the handle 58 is rotated upward to open the lever 50, and thereafter, arc stud welding is repeated in the same manner.

Next, the structure of the lever 50, the attachment of the arc shield holding portion 72 to the lever 50, and the holding of the arc shield split body 30 by the arc shield holding portion 72 will be described with reference to FIGS. FIG. 4, which is an enlarged view taken along line
FIG. 5 is a sectional view taken along the line VV in FIG. 4 and VI-VI in FIG.
This will be described in detail with reference to FIG.

As shown in FIG. 2, the lever 50 is divided into an upper lever portion 90 and a lower lever portion 92, which are detachably connected to each other. That is, a connecting portion 94 is provided at a lower end portion of the upper lever portion 90, and the connecting portion 94 has a vertically inserted lever insertion hole 96 for inserting an upper end portion of the lower lever portion 92.
6, a plate-like slit 98 connected to the lever insertion hole 96 and extending a predetermined length in the longitudinal direction of the lever insertion hole 96 as shown in FIG. A pressing means 100 is provided for pressing the slit opposing portions 94a and 94b of the connecting portion 94, which oppose each other with the slit 98 interposed therebetween, in a direction of approaching each other.

In the present embodiment, the pressing means 100 is provided with a screwless through hole formed in one of the slit facing portions 94a.
100a, a female screw hole 100b formed in the other slit facing portion 94b, and a head screw 100c inserted into the screwless through hole 100a and having a tip screwed into the female screw hole 100b. I have.

To connect the two lever portions 90 and 92, the upper end of the lower lever portion 92 is inserted into the lever insertion hole 96 of the connection portion for a predetermined length, and then the headed screw 100c is rotated forward to advance the slit. This is performed by pressing the opposing portions 94a and 94b toward each other and pressing and holding the upper end of the lower lever portion 92 over the entire lever insertion hole 96 via the slit opposing portions 94a and 94b. The lower lever section
The detachment of the 92 from the connecting portion 94 is performed by rotating and retracting the head screw 100c to release the pressing of the slit facing portions 94a and 94b.

The arc shield holding section 72 includes a holding section main body 74 and a holding body 76. The holding part body 74 is
As shown in FIG. 5, the lower lever 92 is attached to the lower lever 92 by a stepped portion 92a of the lower lever 92 and a nut 92b screwed to the lower end of the lower lever 92.

The arc shield holding portion main body 74 has a concave portion of the arc shield divided body on an inner surface 74a thereof.
A convex portion 74c for fitting to 38 is formed. The convex portion 74c of the arc shield holding portion is fitted into the concave portion 38 of the arc shield split body 30, and a holding member 76 fixed to the holding portion main body 74 by a screw 76a is provided on the upper end surface 30a of the arc shield split body. It is arranged. That is, the arc shield split body 30 is held by the arc shield holding portion 72 vertically holding the upper surface 38a of the concave portion and the upper end surface 30a of the arc shield split body with the convex portion 74c and the holding member 76. I have.

As shown in the figure, the arc shield split body 30 is positioned such that the lower end face of the arc shield split body 30 projects downward by a predetermined length h from the lower end face of the arc shield holding portion 72. Is held. In this embodiment, the predetermined length h is set to 0.3 to 0.7 mm.

In this embodiment, the height (length in the vertical direction) of the concave portion 38 is set to be slightly larger than the height of the convex portion 74c so that a gap is formed therebetween. I have. By doing so, even if the holding part main body 74 is made of metal and thermally deformed from a high temperature during welding, the thermal deformation is absorbed by the gap, thereby cracking the arc shield split body 30 due to the thermal deformation of the holding part main body 74. Generation can be prevented.

According to the arc stud welding machine, the lever 50 is divided into the upper lever portion 90 and the lower lever portion 92 and these are detachably connected to each other. The entirety of the lever portion 92 can be replaced, so that the replacement can be performed safely and easily even when the temperature near the arc shield split body is high. The upper lever 90 and the lower lever 92 are connected by inserting the upper end of the lower lever 92 into the slit-inserted lever insertion hole 96 of the upper lever, so that one head serving as a pressing means is provided. Lower lever part over lever insertion hole 96 with attached screw 100c
Pressing and holding the upper end of 92
100c can be connected securely even with one screw, so the amount of work required when replacing the arc shield split body is reduced, and a relatively large screw can be used because only one screw 100c is required. Therefore, the handling and handling of the screw 100c at the time of replacement is improved, and the workability of replacing the arc shield split body, that is, the workability of attaching and detaching the lower lever portion is good.

Although the connecting portion 94 is provided on the upper lever portion 90 in the above embodiment, the connecting portion 94 may be provided on the lower lever portion 92. Further, the pressing means is not limited to the headed screw 100c described in the above embodiment, and other means can be used.

[0034]

As described above, according to the arc stud welding machine according to the present invention, the lever is divided into the upper lever portion and the lower lever portion and these are detachably connected to each other. When replacing the divided body, the entire lower lever portion can be replaced. Therefore, even if the temperature near the arc shield divided body is high, the replacement can be performed safely and easily.

The connection between the upper lever portion and the lower lever portion is performed by inserting the other lever portion into the slit-inserted lever insertion hole of the connecting portion provided on one lever portion, and pressing the other lever portion through the slit-facing portion. It is performed by pressing and holding the other lever part with the whole lever insertion hole,
The pressing means may be one pressing means for locally pressing and only one pressing means, so that a relatively large pressing means can be used, so that the workability of replacing the arc shield divided body by attaching and detaching the lower lever portion is good. It is.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an arc shield split body used in an embodiment of an arc stud welding machine according to the present invention.

FIG. 2 is a front view showing an embodiment of the arc stud welding machine according to the present invention.

FIG. 3 is a right side view showing an embodiment of the arc stud welding machine according to the present invention.

FIG. 4 is a view taken along the line IV-IV in FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a view taken along the line VI-VI of FIG. 2;

FIG. 7 is a diagram illustrating arc stud welding using an arc shield.

FIG. 8 is a front view showing a comparative example of the arc stud welding machine.

[Explanation of symbols]

 30 Arc shield split body 90 Upper lever part 92 Lower lever part 94 Connecting part 96 Lever insertion hole 98 Plate slit 100 Pressing means

Continuing on the front page (72) Inventor Kenji Namiki 1-90, Shimotakano, Sugito-cho, Kita-Katsushika-gun, Saitama Prefecture (72) Inventor Yasuya Nakano 3-3-105, Yoshiyuki Fujisawa-shi, Kanagawa Prefecture (56) References JP-A Heisei 3- 155472 (JP, A) JP-A-3-23072 (JP, A) Jpn.

Claims (1)

(57) [Scope of request for utility model registration] 1. An arc stud welding machine comprising a plurality of openable and closable levers, and an arc shield split body formed by dividing a cylindrical arc shield into a plurality of parts at a lower end of each lever. Each of the levers is divided into an upper lever portion and a lower lever portion, and one of the two lever portions is provided with a connecting portion, and the connecting portion is provided with the other lever portion. A lever insertion hole to be inserted, a plate-shaped slit connected to the lever insertion hole in a plan view and extending a predetermined length in the longitudinal direction of the lever insertion hole, and a slit facing portion facing the slit of the connection portion with the slit therebetween. Pressing means for pressing in the direction of approaching each other is provided, the other lever part is inserted into the lever insertion hole, and the slit facing parts are brought close to each other by the pressing means. An arc stud welding machine wherein the two lever portions are connected by pressing in a direction in which they are made to move.