JP2539230Y2 - 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 Conventionally, in arc stud welding, a cylindrical arc shield (ferrule) 2 is 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 one example of an arc stud welding machine using the above-mentioned arc shield, as described in Japanese Patent Application Laid-Open No. 59-141379 and Japanese Utility Model Application Laid-Open No. 60-181269, a plurality of cylindrical arc shields are used. For example, it has been proposed to divide the arc shield into two parts and hold the two arc shield divisions so as to be able to come and go.

As an example of the above arc stud welding machine, for example, the one shown in FIG. 11 can be considered. The illustrated arc stud welding machine is provided with two levers 12 which are opened and closed by a vertical rotation operation of a handle 10, and an arc shield holding portion 14 is provided at a lower end of the lever 12 with a step 12 a of the lever 12.
And a nut 20 screwed to the lower end of the lever 12 so as to be vertically clamped and attached. Each arc shield holding portion 14 has an arc shield split body 16 formed on the inner surface of the holding portion main body 17. It is vertically held and held by the convex portion and the holding body 18. Arc shield split body
16 has a substantially semi-cylindrical shape as shown in FIG. 1 described below.

In the above welding machine, first, the handle
10 is rotated upward from the position shown by the solid line in FIG. 11 to the position shown by the broken line to bring the two levers 12 into the open state shown by the broken line,
The head of the stud 4 is held by the chuck 28 provided at the tip of the welding gun 26. Next, the handle 10 is turned downward to bring both levers 12 into the closed state shown by the solid line. In this closed state, the two arc shield split bodies 16 face each other and come into contact with each other to form a cylindrical arc shield, and the stud 4 is inserted into the arc shield. Then, lower the welding machine from this state,
The lower end portion of the stud 4 and the lower end surface of the arc shield split body 16 are brought into contact with each other at a predetermined position of the workpiece 6, and welding is performed by covering the welded portion of the stud 4 with a cylindrical arc shield. After welding is completed, the handle 10 is rotated upward to open the lever 12, the two arc shield split bodies 16 are separated from the welded stud 4, and thereafter, arc stud welding is repeated in the same manner. According to this method, the arc stud welding can be repeatedly performed many times by the same arc shield.

[0006]

[Problems to be Solved by the Invention] By the way, for example, in a construction site, tens or hundreds of studs are often welded continuously. Arc shield split 16 is eroded or damaged by molten metal,
During the welding, the arc shield split body 16 needs to be replaced with a new one.

In such a case, a method of replacing only the arc shield divided body 16 with a new one, or separately preparing an arc shield holding part 14 holding the new arc shield divided body 16 and replacing the arc shield holding part with a new one. Although a method of replacement is considered, during continuous arc stud welding, the temperature near the arc shield split body 16 is extremely high, and therefore, the arc shield split body 16 and the arc shield holding portion as described above are used. Replacing 14 is difficult.

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 ends of the lower lever 24 are inserted into the lever insertion holes 22a formed in the upper lever as shown in the drawing, and the lower ends of the screws 22b are connected to each other. In the method of pressing the lever portion 24, when the lower lever portion 24 is formed of a cylindrical rod having a circular cross section, the rotation position of the lower lever portion 24 (the rotation position about the central axis of the lower lever portion 24) Since the lower lever 24 is not uniquely determined, it is difficult to set the lower lever portion 24 to a normal rotation position during connection.

[0010] Therefore, in the connection structure as described above,
The lower lever portion 24 is connected in a state shifted from the normal rotation position, and when the two levers 12 are closed, the arc shield split bodies 16 can not correctly face each other and abut, or at first, Even if they are connected so as to face each other correctly, the lower lever portion 24 rotates due to some external force during welding, and a problem arises in that the arc shield split bodies 16 do not face each other correctly.

In view of the above circumstances, an object of the present invention is to provide an arc stud welding machine capable of safely and easily replacing an arc shield split body and allowing the arc shield split bodies to always face each other correctly. Is to do.

[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, and a taper member having a tapered surface facing the lever insertion hole and inclined with respect to a predetermined direction substantially perpendicular to the longitudinal direction of the lever insertion hole, and A flat surface is provided on the outer surface of the lever portion, the other lever portion is inserted into the lever insertion hole, and the tapered member is brought into contact with the flat surface of the other lever portion by the tapered surface. The two lever portions are connected by pressing in the predetermined direction.

The connecting portion may be fixed to the one lever portion in advance, or the one lever portion may be formed by the tapered member simultaneously with the other lever portion in the same manner as the other lever portion. It may be connected to a part.

[0014]

In the arc stud welding machine, when the tapered member is pressed in the predetermined direction, the pressing force acts on the other lever portion via the tapered surface of the tapered member, and the tapered surface and the lever insertion hole are pressed. The other lever part is pressed and held between the inner lever and the inner surface of the lever. When the pressing of the taper member in the predetermined direction is released, the pressing and holding of the other lever portion by the tapered surface and the inner surface of the lever insertion hole is released,
Both lever portions are detachable.

That is, since the arc stud welding machine is configured such that the lever is divided into an upper lever portion and a lower lever portion and these are detachably connected to each other as described above, the lower portion is replaced when the arc shield split body is replaced. The entire lever part 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.

In the above connection, a flat surface is formed on the other lever to be connected, and the flat surface is pressed by the tapered surface of the tapered member. Therefore, the rotational position of the connecting portion of the other lever portion is uniquely determined by the flat surface, so that the flat surface is mounted so that the other lever portion is in the normal rotational position, that is, the arc shield split body is mounted in the correct direction. If they are set in advance so that they can be connected, the arc shield split members are always mounted in the correct orientation at the time of connection, and there is no danger of the orientation being shifted during welding.

[0017]

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 side surface 34 has a stud insertion hole slightly larger than the outer diameter of the stud 80 as shown in FIG. 5 described below, and the outer side surface 36 is provided with this arc shield split body 30 in an arc shield holding portion described below. A recess 38 for holding 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 above-mentioned arc shield split body 30 is shown. FIG. 3 is a right side view of the welding machine shown in FIG. FIG. 4 is an enlarged view taken along line IV-IV in FIG. 2, and FIG. 5 is a sectional view taken along line VV in FIG.

The welding machine 42 shown in the figure has a base 44, a pair of levers 50 rotatably supported by two legs 46 fixed to the base 44 via fulcrum pins 48, 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.

Each of the levers 50 of the welding machine main body is divided into an upper lever portion 90 and a lower lever portion 92, and these are detachably connected to each other. An arc shield holding portion 72 is detachably attached to a lower end portion of the lower lever portion 92, and each of the arc shield holding portions 72 holds the arc shield split body 30.

The above-mentioned arc shield holding section 72 is shown in FIGS.
As shown in the figure, the main body includes a holding portion main body 74 and a holding body 76.
The holding portion main body 74 is attached to the lower lever portion 92 by a step portion 92a of the lower lever portion 92 and a nut 92b screwed to a lower end portion of the lower lever portion 92. A convex portion 74c formed on the inner side surface 74a of the arc shield holding portion main body is fitted into the concave portion 38 of the arc shield split portion, and a screw 76a is mounted on the upper end surface 30a of the arc shield split portion by a screw 76a. A holding body 76 fixed to 74 is provided,
The arc shield split body 30 is sandwiched between the convex portion 74c and the holding member.
The upper surface 38a and the upper end surface 30a of the concave portion are held by the arc shield holding portion 72 by vertically sandwiching the upper surface 38a and the upper end surface 30a.

As shown, the arc shield split body 30 is positioned such that the lower end face of the arc shield split body 30 protrudes 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. 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 between them. Due to this gap, even if the holding part main body 74 is made of metal and is thermally deformed at a high temperature during welding, the thermal deformation is absorbed by the above-mentioned gap, thereby causing cracking of the arc shield split body 30 due to the heat deformation of the holding part main body 74. Etc. can be prevented.

The arc stud welding by the welding machine 42 is performed as follows. First, the handle 58 is rotated upward from a position shown by a solid line in FIG. 2 to a position shown by a broken line. Then, the joint pin 54 moves downward in the elongated hole 60, and the joint pin 52 rotates about the fulcrum pin 48 to open the two levers 50, and the open state shown by the broken line. Thereafter, the head of the stud 80 is gripped by the chuck 68, and the handle 58 is pivoted downward so that both levers 50
Is closed to bring it into the closed state shown by the solid line. In this closed state, the arc shield holding portions provided on each lever 50
72 are in contact with each other, and the arc shield divided bodies 30 are also in contact with each other facing each other to form a cylindrical arc shield, and a stud 80 is inserted into the arc shield. 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,
The switch 69 is pressed to perform welding. After welding,
The handle 58 is turned upward to open the lever 50, and thereafter, arc stud welding is repeated in the same manner.

Next, the connection structure of the lever 50 will be described.
6 and FIG. 6 which are enlarged views taken along the line VI-VI in FIG.
This will be described in detail with reference to FIG. 7 which is a sectional view taken along the line I-VII. A ring-shaped connecting portion 94 is fixed to a lower end portion of the upper lever portion 90 by welding or the like. The connecting portion 94 extends vertically in FIG. 2 for inserting an upper end portion of the lower lever portion 92. A lever insertion hole 96 and a tapered member 98 are provided. As shown in FIG. 6, the tapered member 98 faces the lever insertion hole 96 and extends in a direction indicated by an arrow D which is a predetermined direction substantially perpendicular to the longitudinal direction (the vertical direction in FIG. 2) of the lever insertion hole 96. It has a tapered surface 98a inclined with respect to it. The taper member 98 includes:
The base end portion 98b is loosely fitted into the hole 94a formed in the connecting member 94, and the male screw portion 98c formed on the distal end side passes through the hole 94b formed in the connecting member 94, and as a whole, in the predetermined direction ( The connecting member 94 is movably provided in the direction of arrow D), and a nut 100 is screwed to the male screw portion 98c. Note that the two-dot chain line in FIG. 7 is the arrow E in FIG.
The end face shape seen from the direction is shown. That is, the tapered member 98
Is formed of a cylindrical member having a uniform circular cross section, and one side surface thereof is tapered to form a tapered surface 98a.

The lower and lower lever portions 92 of the upper lever portion 90 are formed of cylindrical rods having a circular cross section, and a flat surface 92a formed by chamfering is provided on the outer surface of the upper end portion of the lower lever portion 92. . The flat surface 92a has a regular rotational position such that the lower lever portion 92 can correctly abut the arc shield split members 16 in relation to the tapered surface 98a when the lower lever portion 92 is connected to the connecting portion 94. It is set to be.

To connect the lower lever portion 92 to the connecting portion 94, the nut 100 is loosened to slightly move the tapered member 98 in the direction opposite to the arrow D, and under this condition, the lower lever portion 92 is connected.
Insert the upper end of 92 into the lever insertion hole 96 to make the flat surface 92a
And the tapered surface 98a.
To press the taper member 98 in the direction of arrow D, and thereby the lower lever portion is formed by the tapered surface 98a and the inner peripheral surface of the lever insertion hole 96.
This is done by pressing and holding the upper end of the 92.

In the above embodiment, the connecting portion 94 is fixed to the upper lever portion 90 in advance. Next, the connecting portion 94 is formed simultaneously with the lower lever portion 92 in the same manner as the lower lever portion 92. FIG. 8 is a sectional view similar to FIG. 6, and FIG.
This will be described with reference to FIG. 9, which is a sectional view taken along line -IX.

In this embodiment, a lever insertion hole 102 for inserting the upper lever portion 90 is provided in the connecting portion 94 on the side opposite to the lever insertion hole 96 with the tapered member 98 interposed therebetween. The tapered surface 98d is also formed on the opposite side of the tapered surface 98a. Both lever insertion holes 96, 102
Are formed as one hole integrated by the inner hole of the ring-shaped connecting portion 94. The tapered surface 98d is formed symmetrically with respect to the tapered surface 98a about a line extending in the direction of the arrow D.
And inclined with respect to the arrow D direction.
Further, the lower end of the upper lever portion 90 is formed of a cylindrical rod having a circular cross section, and a flat surface 90a is formed by chamfering. Note that the two-dot chain line in FIG.
It shows the end face shape as viewed from the direction of the arrow E in the middle. That is,
The tapered member 98 is made of a conical member, and has tapered surfaces 98a and 98b formed by chamfering both side surfaces.

To connect the lever portions 90 and 92 to the connecting portion 94, the nut 100 is loosened and the tapered member 98 is slightly moved in the direction opposite to the arrow D. Insert the upper end of the lower lever 92 and the lower end of the upper lever 90 into the lever insertion holes 96 and 102, respectively,
90a and 92a are opposed to both tapered surfaces 98a and 98d, and then the nut 100 is tightened to press the tapered member 98 in the direction of the arrow D, thereby forming both tapered surfaces 98a and 98d and both lever insertion holes 96 and 102. This is performed by simultaneously pressing and holding the upper end of the lower lever 92 and the lower end of the upper lever 90 with the inner peripheral surface.

In any of the above embodiments, the arc stud welding machine divides the lever 50 into an upper lever portion 90 and a lower lever portion 92 and removably connects them with a connecting portion 94 and a tapered member 98. Therefore, when replacing the arc shield split body, the entire lower lever portion can be replaced, and therefore, even if the temperature near the arc shield split body is high, the replacement can be performed safely and easily.

6 and 7, in the embodiment shown in FIGS. 6 and 7, the taper surface 98a of the taper member is brought into surface contact with the flat surface 92a formed in the lower lever portion to press and hold.
In the case of the embodiment shown in FIG. 7, the upper lever 90 is also pressed and clamped by bringing the tapered surface 98d into surface contact with the flat surface 90a. It is uniquely defined, so that the arc shield split is always mounted in the correct orientation during the connection, and there is no danger that the orientation will shift during welding.

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.

[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 upper lever and the lower lever are connected by inserting the other lever into the lever insertion hole of the connecting portion provided on one lever, and the flat surface of the other lever is tapered. The rotation position of the other lever portion in the connecting portion is uniquely determined by the flat surface, so that the arc shield split body can always be mounted in the correct direction and the arc shield can be mounted. There is no possibility that the direction of the divided body changes.

[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 sectional view taken along the line VII-VII of FIG. 6;

FIG. 8 is a view similar to FIG. 6, showing another embodiment.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a diagram illustrating arc stud welding using an arc shield.

FIG. 11 is a front view showing a comparative example of an arc stud welding machine.

[Explanation of symbols]

 30 Arc shield split body 90 Upper lever part 90a Flat surface 92 Lower lever part 92a Flat surface 94 Connecting part 96, 102 Lever insertion hole 98 Tapered member 98a, 98d Tapered surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Namiki 1-90, Shimotakano, Sugito-machi, Kita-Katsushika-gun, Saitama JP-A-3-23072 (JP, A) JP-A-3-155472 (JP, A) JP-A-59-94779 (JP, U) JP-B-2-19752 (JP, B2)

Claims (3)

(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, and a taper member having a tapered surface facing the lever insertion hole and inclined with respect to a predetermined direction substantially perpendicular to the longitudinal direction of the lever insertion hole are provided, and the other lever portion is provided on the other lever portion. A flat surface is provided on the outer surface, the other lever portion is inserted into the lever insertion hole, and the tapered member is pressed in the predetermined direction by bringing the tapered surface into contact with the flat surface of the other lever portion. Do An arc stud welding machine wherein the two lever portions are connected to each other. 2. The arc stud welding machine according to claim 1, wherein said connecting portion is fixed to said one lever portion in advance. 3. The connecting portion has a lever insertion hole for inserting the one lever portion on the opposite side of the lever insertion hole with the taper member interposed therebetween, and the taper member has an opposite side to the tapered surface. A tapered surface that faces the lever insertion hole for inserting the one lever and that is inclined with respect to the predetermined direction; a flat surface is provided on an outer surface of the one lever portion; Is inserted into a lever insertion hole for inserting the one lever portion, and both tapered surfaces of the tapered member are brought into contact with the flat surfaces of the two levers and pressed in the predetermined direction, whereby the other lever portion is inserted. The arc stud welding machine according to claim 1, wherein the connection to the one lever is performed simultaneously with the connection to the connection.