JPH069773U - Spot welder - Google Patents

Abstract

(57) [Abstract] [Purpose] When performing spot welding, the work can be held horizontally without being affected by the floor surface, and the work can be performed safely without interfering with the feet of the worker. Provide a spot welding machine equipped with a work table having a compact structure as a whole. [Structure] Among upper and lower arms supporting upper and lower electrodes in a spot welding machine, a support member is extended from both left and right sides of the lower arm, and a table spanning both support members is positioned between the upper and lower electrodes. In this structure, a through hole facing the upper and lower electrodes is opened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a spot welder, and more particularly, to a spot welder that is provided with a work table to facilitate welding work accurately.

[0002]

[Prior art]

 Conventionally, the spot welder has upper and lower arms on a column that is erected on the base, and the upper and lower electrodes are supported by the upper and lower arms. In addition to being positioned between them, two workpieces are sandwiched by the upper and lower electrodes, and a large current is applied by applying pressure to perform spot welding.

[0003]

[Problems to be solved by the device]

 In the case of the spot welding, for example, in the case of products such as steel furniture cabinets where the finish of the appearance should be emphasized, so-called spot marks (dents on the spot surface) that occur in the spot-welded welds should be minimized. Must be suppressed.

Therefore, for this purpose, it is important to hold the work in a horizontal state during the work of spot welding. In other words, the upper and lower electrodes must be pressure-bonded to the surface of the work from the vertical direction. This is because the work is not kept horizontal, and if the upper and lower electrodes are pressed against the surface of the work from the direction of inclination, the work is deformed and a recess is formed in the weld.

By the way, the conventional spot welding machine does not consider horizontal holding of the work as described above, and the welding work is left to the responsibility of the user who uses the welding machine. .

Therefore, when a user uses a conventional spot welding machine to perform spot welding, in order to position the work between the upper and lower electrodes and hold the work in a stationary state, the user appropriately procures a workbench. The current situation is to arrange a pair of worktables on the left and right of the upper and lower electrodes, and place the work on this worktable so that welding work can be performed.

However, under such a current situation, not only is it inconvenient for the user to procure an appropriate workbench, but also a space for arranging the workbench on the left and right of the welding machine is required, and many work benches are required. It is impossible to save space in the factory when installing the welding machine. In addition, the provision of the workbench narrows the space under the feet of the worker, making the welding operation difficult and creating a dangerous cause during the work. Moreover, even if a pair of work benches are provided, if the floor surface is not horizontal, the work piece can be kept horizontal as described above by inserting a spacer or the like between the work bench and the floor surface. Therefore, the work load of the site workers will increase because more work is required to do so.

[0008]

[Means for Solving the Problems]

 The present invention provides a spot welding machine that solves the above-mentioned problems.The first means is to provide a spot welding machine having upper and lower arms for supporting upper and lower electrodes, respectively. The support members are extended from both left and right sides, a table spanning both support members is positioned between the upper and lower electrodes, and a through hole facing the upper and lower electrodes is formed in the table.

Further, the present invention is configured as a second means, in a spot welding machine having upper and lower arms respectively supporting upper and lower electrodes, a pair of support members attached to both left and right sides of the lower arm, A table is provided on both support members via a positioning means and is arranged between the upper and lower electrodes, and the positioning means has a space between the support member and the table on an axis substantially parallel to the lower arm. The table is provided with a through hole facing the upper and lower electrodes, and the through hole is formed substantially parallel to the lower arm. It is a point formed by an elongated hole extending in the axial direction.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the spot welding machine 1 is known per se, and is provided with vertical arms 3 and 4 on a column 2 standing on a base, and upper and lower arms 3 and 4 are vertically moved. The electrodes 5 and 6 are supported. The upper and lower electrodes 5 and 6 are moved in a mutually close direction by a drive source composed of a cylinder by operating an operation switch such as a foot pedal (not shown), and are set between the electrodes 5 and 6. A work consisting of two metal plates is crimped, and spot welding is performed by passing an electric current, and after welding is completed, it can be returned to its original position.

In the present invention, the spot welding machine 1 is provided with a workbench, and in this embodiment, the workbench is provided over a pair of support members 7, 7 and both support members 7, 7. It is composed of a table 8.

The pair of support members 7, 7 are configured to be symmetrical to each other, and have a mounting portion 9 along the side surface of the lower arm 4 and an outwardly extending shape from the mounting portion 9. It has a wing portion 10 and a rail portion 11 bent upward at the upper end of the wing portion 10, and is integrally formed of a robust metal plate. The mounting portion 9 is formed by superimposing an auxiliary plate 12 on the side surface facing the lower arm 4 and integrating them by welding or the like. By bending the upper end edge of the auxiliary plate 12, the top surface of the lower arm 4 is bent. To form an engaging edge 12a for engaging with.

Therefore, in order to attach the pair of support members 7, 7 to the lower arm 4, screw holes 13 are formed on both sides of the lower arm 4, and the support members 7, 7 are attached to the corresponding support members 7, 7. The holes 7a, 7a are provided so as to penetrate the mounting portion 9 and the auxiliary plate 12. Therefore, as shown in FIGS. 2 and 3, on both sides of the lower arm 4, the engaging edges 12a of the support members 7, 7 are engaged with the top surface of the lower arm 4, and the fastening of a butterfly bolt or the like is performed. The pair of support members 7, 7 is detachably attached to the lower arm 4 by fastening the means 14 to the screw hole 13 via the attachment hole 7a. In this state, the rail portion 11 of the support member 7 is arranged substantially parallel to the lower arm 4.

The table 8 constitutes a rectangular plate having a size laid across the pair of support members 7, 7 and is formed of a metal plate. The surface of the table 8 is preferably laminated or coated with a hard resin such as melamine resin. Alternatively, the table 8 may be formed of a wooden or resin plate and subjected to surface treatment by laminating or coating the hard resin.

As shown in FIG. 2, the table 8 is laid across the support members 7 and 7 via the positioning means 15. In the example shown in the figure, the lower surface of the table 8 has the support member 7 mounted on the lower surface thereof. The groove member 16 for receiving the ruled portion 11 is fixed. Only one of the groove members 16 is shown in the drawing, but a pair is provided corresponding to each of the support members 7, 7.

The positioning means includes a plurality of concave portions 17 provided at intervals on the axis of the rail portion 11 arranged substantially in parallel with the lower arm 4, and a convex portion 18 provided on the groove member 16. The convex portion 18 can be fitted into the selected concave portion 17 freely. In the case of the illustrated example, the concave portion 17 is formed by the notch 19 formed in the rail portion 11, and the convex portion 18 is formed by the pin 20 that is fixed by penetrating the groove member 16, but the specific configuration is not limited. . Further, in the present embodiment, the concave portion 17 is provided on the support member 7 and the convex portion 18 is provided on the table 8, but this may be reversed.

As shown in FIG. 3, the positioning means 15 composed of the concave portion 17 and the convex portion 18 is provided in a pair in the vicinity of both ends of the rail portion 11 and the groove member 16. Therefore, the interval pitch of the recesses 17 provided on the tip end side of the rail portion 11 and the interval pitch of the recesses 17 provided on the tail end side of the rail portion 11 are configured to be equal, and a pair of front and rear protrusions 18, 18 simultaneously fits into the recesses 17, 17 to keep the table 8 horizontal. Then, in this state, the table 8 is arranged between the upper and lower electrodes 5 and 6.

As shown in FIG. 1, the table 8 has a through hole 21 facing the upper and lower electrodes 5 and 6, and the through hole 21 is an elongated hole extending in an axial direction substantially parallel to the lower arm 4. Has been formed. At this time, it is preferable to form the wide portions 21a, 21a at both ends of the long hole.

When performing spot welding based on the above-described embodiment, since the table 8 is installed in a horizontal posture by the pair of support members 7, 7, a work is placed on the table 8 and Spot welding may be performed by moving a work on the table 8 so that a predetermined welding position faces the electrodes 5 and 6 and operating the electrodes. In this state, the work piece is kept in a horizontal posture, that is, in a posture in which the electrodes 5 and 6 are received vertically, so that good spot welding is possible and the above-mentioned spot mark is minimized. be able to. In addition, since the worker's feet are a free space, workability is good.

By the way, the size of the work differs depending on the purpose of the work. For example, when the work is a large-sized metal plate whose edge is close to the support 2, the table 8 is moved in front of the worker. In some cases, the work may not be stable unless it is supported by the center as much as possible. In such a case, the table 8 is lifted, the fitting between the concave portion 17 and the convex portion 18 is released, the table 8 is pulled out toward the front of the operator, and then the convex portion 18 is fitted into another concave portion 17. The table 8 may be supported on the support member 7. Such a position adjustment amount of the table 8 can be designed arbitrarily according to the number of rows of the concave portions 17, and the length of the through hole 21 of the table 8 may be designed according to the adjustment amount.

Incidentally, in the general-purpose spot welding machine 1, the upper and lower electrodes 5 and 6 can be positionally adjusted in the vertical direction and the front-back direction with respect to the upper and lower arms 3 and 4. With respect to such an adjustment position, the through hole 21 of the table 8 is formed as a long hole that is long in the front-rear direction, so that the through hole 21 can always be exposed to the upper and lower electrodes 5, 6. The electrodes 5 and 6 may be of a crank type other than the straight rod as shown in the figure, but even for such a crank type electrode, the wide portion of the through hole 21 is also used. 21a looks good.

As described above, the table 8 may be formed of an insulating material such as wood or resin, or may be formed of a metal material such as a metal plate. In the case of such a metal, There is a secondary effect of stabilizing the welding current. That is, when a work made of a metal plate is usually inserted between the upper and lower electrodes 5 and 6, magnetism is generated between the electrodes because the work is a magnetic substance, and the current of the electrodes is reduced. . For this reason, it is known that a preset current value cannot be obtained, and spot welding defects sometimes occur. In this regard, if the table 8 is made of a metal plate, it is possible to detect the current drop of the electrode due to the magnetism generated by the table 8 before the work is loaded. By setting, there is an advantage that current shortage at the time of loading the work can be prevented.

[0024]

[Effect of device]

 According to the present invention as set forth in claim 1, since the work table composed of the support members 7, 7 and the table 8 is attached to the lower arm 4 of the spot welding machine 1, the work table can be set by the user as in the conventional case. It is not necessary to procure it, which is convenient when performing spot welding work.

Particularly, by fixing the support members 7 and 7 to the lower arm 4 and straddling the table 8 on both support members 7 and 7, the table 8 can be placed in a horizontal posture without being affected by the floor surface. Since it can be fixed, the work can be easily held horizontally during welding work, and the spot traces that occur on the work during spot welding can be suppressed as much as possible, so spot welding with a good finish is always possible. And

Further, according to the present invention, since the operator's feet are free space and do not have a member structure that interferes with the operator's feet, there is no danger of work and the workability is good. . Moreover, the work table including the support members 7, 7 and the table 8 is integrated with the spot welding machine 1 and does not require various supporting mechanisms in the periphery, so it is relatively compact and spot-welded in the factory. It also contributes to space saving when installing the machine.

According to the present invention as set forth in claim 2, in addition to the above, the table 8 is provided with a positioning means 15 comprising a plurality of concave portions 17 and convex portions 18 which can be fitted into the selected concave portions 17. The position can be adjusted in the front-back direction of the operator, and the through hole 21 is formed in a long hole in response to this position adjustment. Therefore, although the structure is relatively compact as a whole as described above, It is possible to move and adjust the table 8 to a predetermined position in correspondence with works of different sizes, which has an effect of always being able to perform good work easily.

Further, if the support members 7, 7 are detachably attachable to the screw holes 13 of the lower arm 4 by the fastening means 14 such as butterfly bolts as in the above-described embodiment, a conventional general-purpose spot welding machine is provided. The present invention can be implemented immediately by simply providing the screw holes 13 in 1, and is excellent in easiness of implementation, easy to disassemble and assemble, and convenient for packaging and transportation.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a front view showing a partial cross-section of one embodiment of the present invention and an enlarged cross-sectional view of a main part.

FIG. 3 is a side view showing a partial cross-section of one embodiment of the present invention.

[Explanation of symbols]

 1 Spot Welder 3 Upper Arm 4 Lower Arm 5 Upper Electrode 6 Lower Electrode 7 Support Member 8 Table 9 Mounting Part 10 Wing Part 11 Rail Part 12 Auxiliary Plate 12a Engaging Edge 13 Screw Hole 14 Fastening Means 15 Positioning Means 16 Groove Member 17 Recessed portion 18 Convex portion 19 Notch 20 Pin 21 Through hole 21a Wide portion

Claims (2)

[Scope of utility model registration request] 1. A spot welding machine having upper and lower arms respectively supporting upper and lower electrodes, wherein a support member is extended from both left and right sides of the lower arm, and a table spanning both support members is provided between the upper and lower electrodes. The spot welding machine is characterized in that it is positioned and a through hole facing the upper and lower electrodes is opened in the table. 2. A spot welding machine having upper and lower arms that respectively support the upper and lower electrodes, and a pair of support members attached to both left and right sides of the lower arm, and straddling the support members via positioning means. And a table arranged between the upper and lower electrodes, and the positioning means is selected from a plurality of recesses provided at intervals on an axis substantially parallel to the lower arm, between the support member and the table. The table is provided with a through hole facing the upper and lower electrodes, and the through hole is formed as an elongated hole extending in an axial direction substantially parallel to the lower arm. Characteristic spot welding machine.