JP2539232Y2 - Arc stud welding machine - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an arc having two levers which can be opened and closed, and an arc shield divided body formed by dividing a cylindrical arc shield into two at the lower end of each lever. It relates to a 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 an arc stud welding machine using the above-mentioned arc shield, as described in, for example, JP-A-59-141379 and JP-A-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 such an arc stud welding machine, for example, the one shown in FIG. 8 can be considered. The illustrated arc stud welding machine includes a base 8, on which two rods 10 extending vertically are erected.
A welding gun 12 is supported on 10 and the base 8 is provided with two legs 14 extending downward. A lever 16 is rotatably connected to each leg 14 by a connecting pin 16a, and each lever 16 is rotatably connected to one end of the link 18 by a connecting pin 18a at a position above the connecting pin 16a. The other end of each link 18 is rotatably connected to each other by a connecting pin 18b, and the connecting pin 18b is vertically movably guided by a vertically extending guide hole 20 at a position below the base 8. In addition, both levers 16
An arc shield holding part 22 is attached to a lower end of each of them, and an arc shield split body 24 is held in each arc shield holding part 22, respectively. The arc shield divided body 24 has a substantially semi-cylindrical shape as shown in FIG. 1 described below.

In the welding machine, first, a handle 26 provided at one end of the one link 18 is rotated upward from a position shown by a solid line in FIG. 8 to a position shown by a broken line in FIG. The connection pin 18b is moved downward along the guide hole 20 and the connection pin 18a is rotated about the connection pin 16a to thereby move the two levers 16a.
Is opened by a broken line, and the head of the stud 4 is gripped by the chuck 28 provided at the tip of the welding gun 12. Next, the handle 26 is rotated downward to bring both levers 16 into the closed state indicated by the solid line. In this closed state, the two arc shield split bodies 24 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. Subsequently, the welding machine is lowered from this state, and the lower end portion of the stud 4 and the lower end surface of the arc shield split body 24 are brought into contact with a predetermined position of the material 6 to be welded, and the stud 4 is welded with a cylindrical arc shield. Weld over the part. After the welding is completed, the handle 26 is turned upward to open the lever 16, and the two arc shield split bodies 24 are separated from the stud 4 thus welded. 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]

By the way, in the welding machine constructed as described above, the handle 26 is disposed below the base 8, and the handle 26 is relatively low at substantially the center in the vertical direction in the entire welding machine. The location is located.

Therefore, when actually performing welding work, it is necessary to operate the handle 26 located at a relatively low place, and the welding work posture becomes unnatural and cramped with forward bending, and the welding workability is reduced. There is a problem that is not good.

In view of the above circumstances, it is an object of the present invention to provide an arc stud welding machine which can perform a welding operation in a natural posture by extending a back and thus has a good welding operation.

[0009]

In order to achieve the above object, the arc stud welding machine according to the present invention has two 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 two pieces is attached,
◆ The two levers are rotatably connected to the base and have upper extensions extending upward from the connection from the connection, and a link is provided at the upper end of the upper extension of each lever. One end of the link is rotatably connected, and the other ends of the links are rotatably connected to each other, and the rotatable connection of the other ends of the links is located above the base. The guide is movably guided in the vertical direction, and one of the two links includes:
A handle for tilting the link to open and close both levers is provided.

[0010]

In the above arc stud welding machine, the two levers are rotatably connected to the base and have an upper extension extending upward from the connection to the base, and the upper end of the upper extension is provided. One end of the link is rotatably connected to the link, and one of the links is provided with a handle.
Accordingly, the handle is disposed above the base, and the handle is located relatively high above the entire welding machine.

Therefore, when performing the actual welding operation, since the handle to be operated is located at a relatively high place as described above, the back is extended without leaning forward and the handle is operated in a natural posture. The welding workability is good.

[0012]

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 arc shield split body 30 is shown. FIG. 3 is a right side view of the welding machine shown in FIG. 4 is an enlarged view taken along the line IV-IV in FIG. 2, FIG. 5 is a sectional view taken along the line VV in FIG. 4, and FIG.
FIG.

The illustrated welder 42 includes a base 44,
Two rods 46 extending upward are erected on the upper surface of 44,
A welding gun 48 is attached to the rod 46. Two levers 50 are rotatably connected to the base 44 via connection pins 52, respectively, and each lever 50 extends upward from the connection portion (the connection pin 52 portion) of the base 44. An upper extension 54 is provided. One end of a link 56 is rotatably connected to the upper end of each of the upper extension portions 54 by a connection pin 58, and the other ends of both links 56 are rotatably connected to each other by a connection pin 60. I have. Above base
A guide member 62 extending upward therefrom is fixed to the front surface of a front protruding portion 44a protruding forward (in the direction of arrow D in FIG. 3) substantially at the center of the left and right direction (direction of arrow B in FIG. 2).
The guide member 62 is formed with a vertically extending guide hole 64 which is a guide portion for guiding the connection pin 60 movably in the vertical direction (the direction of arrow C in FIG. 2). The pin 60 is fitted. A handle 66 extending in the left-right direction is fixed to one end of the one link 56. Further, a stud 80 is provided at the lower end of the welding gun 48.
A chuck 68 for holding the head of the welding gun is provided, and the welding gun 48 is provided with a handle 70 having a welding switch 69.

Each of the levers 50 is composed of an upper lever portion 90 including the upper extension portion 54 and a lower lever portion 92 which 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,
The arc shield holders 72 hold the arc shield split bodies 30 respectively.

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. 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.

The arc shield split body 30 is in a state where 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 as shown in the figure. 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 connection between the upper lever 90 and the lower lever 92 is performed as follows. That is, as shown in FIGS. 2 and 6, a connecting portion 94 is formed at the lower end of the lower lever portion 92, and the connecting portion 94 has a lever insertion hole penetrating vertically.
6 and a plate-like slit 98 connected to the lever insertion hole 96 and extending vertically as shown in FIG. 6 when viewed from above, and one slit facing the slit 98 of the connecting portion 94. A threaded through hole 100a is formed in the facing portion 94a, and a female screw hole 100b is formed in the other slit facing portion 94b.
100a and is screwed into the female screw hole 100b.

Then, the head screw 100c is loosened, the upper end of the lower lever 92 is inserted into the lever insertion hole 96, and then the head screw 100c is tightened.
The connection between the levers 90 and 92 is performed, and the levers 90 and 92 are detached by loosening the head screw 100c.

The arc stud welding by the welding machine 42 is performed as follows. First, the handle 66 is rotated upward from a position shown by a solid line in FIG. 2 to a position shown by a broken line. Then, the link 56 tilts and the connecting pin
60 moves downward in the guide hole 64, the connecting pin 58 rotates about the connecting pin 52, and the two levers 50 open, and the open state shown by the broken line is established. Then studs on chuck 68 above
The head of 80 is gripped, and the handle 66 is rotated downward to close both levers 50, thereby bringing the closed state shown by the solid line. In this closed state, the arc shield holding portions 72 provided on the respective levers 50 are in contact with each other, and
30 comrades face each other and abut each other to form a cylindrical arc shield, in which studs 80
Is inserted. 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 66 is rotated upward to open the lever 50, and thereafter, arc stud welding is repeated in the same manner.

According to the arc stud welding machine, the two levers 50 are rotatably connected to the base 44 and extend upwardly from the connection (the connection pin 52) upward of the base 44. One end of a link 56 is rotatably connected to the upper end of the upper extension 54, and a handle 66 is provided at the one end of one link 56.

Therefore, the handle 66 is located above the base and relatively high in the entire welding machine 42. As a result, the back is stretched without bending over during welding, and the handle 66 is held in a natural posture. The handle 66 can be operated, and welding workability is good.

In the welding machine 42, the lever 50 (arc shield divided body) is rotated by rotating the handle 66.
30), so that the opening and closing operation can be performed very easily and at will.

The handle 66 functions not only for opening and closing the lever 50 but also as a handle for stabilizing the welding position in cooperation with the handle 70 of the welding gun. That is, the handle 70 provided on the welding gun 48 extends in the front-rear direction (see the arrow D in FIG. 3) from the rear surface of the welding gun 48 to the rear, and the handle 66 is viewed from above with respect to the handle 70. Are arranged at an angle of 90 °. By providing the handle 66 at right angles to the handle 70 of the welding machine in this manner, the welding machine can be gripped by holding the handle 70 of the welding machine with the right hand, placing the index finger on the switch 69, and holding the handle 66 with the left hand during welding. 42 can be held in a well-balanced manner, and the welding operator can easily take a stable welding position, thereby improving work efficiency and reducing welding defects.

The chuck 68 is configured to hold the stud 80 on the same axis extending vertically with the welding gun 48, and the stud 80 gripped by the chuck 68 is connected to the arc shield holder 72. The lever 50 is positioned so as to be located on the same plane as the two levers 50 to be mounted, that is, the center axis of the stud 80 and the center axis of the two levers 50 are located on the same plane (a plane extending in the left-right and up-down directions). And welding gun
48 and are arranged. With such a configuration, the arc shield divided body 30 is reliably and evenly brought into contact with the base material, thereby enabling stable welding and improving the reliability of welding.

[0027]

As described above, according to the arc stud welding machine of the present invention, the lever is provided with the upper extension extending above the base, and the one end of the link is turned on the upper end of the upper extension. The link is movably connected and the link is provided with a handle, so that the handle is located at a high position above the base and relatively high throughout the welding machine, so that the back can be extended without bending over during welding. The steering wheel can be operated in a natural posture and the welding workability is good.

[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 44 Base 50 Lever 54 Upper extension 56 Link 60 Rotatable connection 64 Guide hole 66 Handle

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

Claims (1)

(57) [Scope of request for utility model registration] An arc stud welding machine comprising two openable and closable levers, and an arc shield split body formed by dividing a cylindrical arc shield into two at the lower end of each lever. The two levers are rotatably connected to a base and have upper extensions extending upward from the connection from the connection portion, and a link is provided at an upper end of the upper extension of each of the levers. One end of the link is rotatably connected, and the other ends of the links are rotatably connected to each other, and the rotatable connection of the other ends of the links is located above the base. An arc stud provided with a handle for tilting the link to open and close the levers on one of the two links. Welding machine.