JP2015003324A - Spot welder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spot welder which reduces a load applied to a spot welding gun, makes movement of the welding gun easy, and allows a worker to easily conduct welding while moving.SOLUTION: A spot welder 1 includes: a welder body 2; a spot welding gun 4 which is connected with the welder body 2 through cables 3; a lifter 5 which is erected on the welder body 2 and supports the spot welding gun 4; and a cable support 6 which supports the cables 3 between the spot welding gun 4 and the welder body 2. A third lifter 53 is pivotally supported so as to rotate relative to the second lifter 52 in a plane direction. The cable support 6 holds a bundle of the cables 3 between the welder body 2 and the spot welding gun 4.

Description

  The present invention relates to a spot welder that applies a current to a base material and welds metal with its resistance heat.

  Conventionally, as a spot welder, a spot welding gun is connected to a welding machine main body movably supported by a caster via a cable, and an operator performs welding work of a sheet metal with the welding gun in hand. An apparatus is known (for example, refer to Patent Documents 1 and 2). In such a spot welder, the spot welding gun is suspended from a lifter attached to the welder body. According to this configuration, since the spot welding gun having a relatively heavy weight is suspended at the working height, the operator can perform the welding work while holding the spot welding gun with a sense of weightlessness. .

  Especially in the spot welding machine mentioned above, the lifter is divided and connected in multiple stages near the position where the spot welding gun is suspended, and it is easy to swing the spot welding gun in the horizontal direction at the operator's hand position. (For example, refer to Patent Document 1). That is, in the conventional spot welder, the lifter is basically not divided in multiple stages, and the rotation of the lifter is realized by being rotatably attached at the attachment portion with the main body of the lifter.

  In addition, in a conventional spot welder, the operator can move the welding gun by hand by rotating the entire lifter or by extending or retracting a hanging tool that hangs the spot welding gun attached to the tip of the lifter. A movement allowable range of the welding gun was provided (see, for example, Patent Document 2). However, in such a configuration, the load applied to the rotation of the lifter and the expansion / contraction of the hanger for hanging the spot welding gun is received by the welding machine main body. For this reason, in order to prevent the welding machine main body from moving or toppling unexpectedly, a technique has also been proposed in which a stopper for preventing overturning is provided in the vicinity of the caster of the welding machine main body (see, for example, Patent Document 1).

JP 2002-224848 A JP 2001-225174 A

  By the way, in the conventional spot welding machine, the weight of the spot welding gun is several kilograms to several tens of kilograms, and the weight is excessive for the operator to hold and work. Of the weight of the welding gun, not only the weight of the spot welding gun itself but also the cable connecting the welding machine body and the spot welding gun may constitute not only the electrical system but also the cooling water piping, and it weighs more than 10 kg. Have Therefore, in operation, this cable may become an obstacle when the welding gun is moved.

  In addition, conventionally, a spring balancer is used as a hanging tool for suspending a welding gun, and this is attached to the base portion of the lifter to provide a movement allowable range of the welding gun. In the structure provided by dividing into multiple stages, the wire discharged from the spring balancer obstructs the lifter rotation, which hinders work.

  The present invention has been made in view of the conventional problems as described above, and the object thereof is to reduce the load applied to the spot welding gun and facilitate the movement of the spot welding gun while the operator moves. An object of the present invention is to provide a spot welding machine capable of easily performing a welding operation.

  In order to solve the above problems, the invention according to claim 1 is directed to a welding machine main body, a spot welding gun connected from the welding machine main body via a cable, and standing on the welding machine main body. A lifter for supporting the gun, and a cable support for supporting the cable between the spot welding gun and the welder body, the lifter being attached to the welder body in a vertical direction. 1 lifter, a second lifter projecting horizontally or obliquely from the first lifter, and a third lifter pivotally supported with respect to the second lifter, The spot welding gun is suspended from the tip of a third lifter, and the cable support includes a bottom portion provided with moving means, a pole standing on the bottom portion, and one of the cables on the support top. Characterized in that and a mounting portion for mounting a.

  In the above aspect, the lifter is divided, and the lifter in the vicinity of the position where the spot welding gun is suspended is configured to be rotatable with respect to other lifters. Thereby, when an operator tries to move the position of the spot welding gun, the lifter in the vicinity of the position where the spot welding gun is suspended can be independently rotated without rotating the entire lifter. As a result, the load is not applied to the entire lifter as the spot welding gun moves.

  Also, by providing a cable support for supporting the cable that connects the spot welding gun and the welding machine main body, it is possible to hold a cable that is heavy and obstructs work. Can be moved more easily. In particular, the cable support of this aspect is provided with moving means and provided separately from the welder main body. For this reason, when working away from the spot welding gun from the welding machine main body, conventionally, the work was performed by dragging the cable, and the weight of the cable was placed on the operator's hand. Work can be performed while moving the cable support between the machine body and the spot welding gun. Therefore, the work can be performed without burdening the weight of the cable by the operator.

  According to a second aspect of the present invention, there is provided a suspension apparatus according to the first aspect of the present invention, wherein the spot welding gun is suspended in the vicinity of the shaft support portion of the second lifter of the third lifter by extending and retracting a wire. It is characterized by having.

  In the above aspect, by providing a suspension device for suspending the spot welding gun in the vicinity of the second lifter shaft support portion of the third lifter, it becomes easier to handle the wire extending and retracting from the suspension device, An excessive load is not applied to the third lifter, and the operator can easily rotate the third lifter relative to the second lifter.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the cable support is configured to be adjustable in height.

  In the above aspect, since the height of the cable support is adjustable, for example, the height of the mounting portion on which the cable of the cable support is mounted is adjusted to the worker's working height or a position higher than that. Thus, the load of the cable applied to the operator can be reduced as much as possible. Thereby, the spot welding machine which does not put a burden on an operator can be provided.

  According to the present invention as described above, there is provided a spot welder that reduces the load applied to the spot welding gun, facilitates the movement of the spot welding gun, and allows the operator to easily perform the welding operation while moving. Can be provided.

The perspective view which shows the whole structure of the spot welder in embodiment of this invention. The side view which shows the structure of the lifter of the spot welder in embodiment of this invention.

  A mode for carrying out the present invention (hereinafter referred to as the present embodiment) will be described with a specific example.

[Constitution]
FIG. 1 is a perspective view showing the overall configuration of the spot welder 1 of the present embodiment. As shown in the figure, a spot welder 1 includes a welder body 2, a spot weld gun 4 connected from the welder body 2 via a cable 3, and a spot weld gun 4 erected on the welder body 2. And a cable support 6 for supporting the cable 3 between the spot welding gun 4 and the welding machine main body 2.

  The welding machine main body 2 has the same configuration as that of the prior art, and is composed of two upper and lower components. An operation panel P, an operation terminal T, a current circuit (not shown for internal configuration), a cable, 3 is provided with a main body device 21 provided with three connection portions C, and further provided with a main body portion 22 provided with cooling fans F and two moving casters K1 and K2 each having two sizes at the bottom.

  The cable 3 includes, for example, a primary cable and a secondary cable, a cooling water hose for supplying cooling water to a spot welding gun 4 described later, and a protective cover for protecting the cable and preventing magnetic diffusion. It is formed by bundling. The cable 3 may have a weight of about 10 to 15 kg including the primary and secondary cables and the cooling water hose.

  In the present embodiment, the spot welding gun 4 is formed in a U shape, and includes electrodes 41 and 42 at the end portion of the U shape. The operator holds the arm A with the insulating coating at the base of the spot welding gun 4 and performs the welding operation.

  The lifter 5 includes a first lifter 51 attached in a vertical direction with respect to the welding machine body 2, a second lifter 52 projecting from the first lifter 51 in a horizontal direction or an oblique direction, and a second lifter 52. The third lifter 53 is pivotally supported so as to be rotatable. A suspending device 54 for suspending the spot welding gun 4 is mounted on the third lifter 53.

  The first lifter 51 is fixed and erected on the lower back of the welding machine main body 2. The first lifter 51 is made of a pole-shaped member having a square cross section, and a second lifter 52 is attached to the upper end of the first lifter 51.

  As shown in FIG. 2, the second lifter 52 extends from a base portion 52 a fixed to the first lifter 51 by welding or the like to an end portion 52 b serving as a connection position with the third lifter 53. The two poles 52c and 52d are connected. The poles 52c and 52d are rotatably attached to the base 52a and the end 52b, respectively, and the second lifter 52 has an angle with respect to the first lifter 51 with the base 52a side as a base point. It can be changed freely. Further, a gas spring G that assists the angle adjustment of the second lifter 52 is provided between the first lifter 51 and the second lifter 52.

  The third lifter 53 is a single rod-shaped body having a square cross section, and the shaft 52e on the end 52b side of the second lifter 52 is pivotable in the plane direction with respect to the second lifter 52. It is supported. The distal end portion 53a of the third lifter 53 is a portion where the above-described spot welding gun 4 is suspended, and a feed roll 53b through which a wire W discharged from a suspension device 54 described later is passed is provided.

  In this embodiment, a spring balancer is used for the suspending device 54, and the spot welding gun 4 is attached to the tip of the wire W discharged from the spring balancer. The spot welding gun 4 is biased upward in the drawing and in the direction of the first lifter 51 in the second lifter 52 by the tension of the spring of the spring balancer (the direction indicated by the arrow in the drawing). Even if the welding gun 4 is held, the weight is not applied to the operator.

  Note that the suspension device 54 is not the tip portion 53a of the third lifter 53 but the end portion on the second lifter 52 side (near the shaft portion 52e) so that the rotation of the third lifter 53 is smooth. It is preferable to provide in. On the other hand, attaching the suspension device 54 to the second lifter 52, the first lifter 51, or the like is inconvenient in the handling of the wire W, thereby preventing the rotation of the third lifter 53. This is not preferable.

  The cable support 6 includes a bottom 61 provided with moving means, a pole 62 erected on the bottom 61, and a mounting portion 63 for mounting a part of the cable 3 on the cable support 6. The bottom portion 61 includes four casters K on the bottom surface of the plate-like body so that the cable support 6 can move independently of the welder main body 2. The pole 62 is a columnar pole having a configuration capable of changing the height, and is fixed to the bottom 61 by welding or the like. The mounting portion 63 is formed of a horizontally long mounting plate 63a having an arc-shaped cross section so that the bundle of cables 3 can be received in the horizontal direction. An appropriate portion of the cable 3 is mounted on the mounting portion 63 between the spot welding gun 4 and the welding machine main body 2 and fixed on the mounting plate 63a by a fixture 63b.

[Function and effect]
The spot welder 1 of the present embodiment having the above-described configuration operates as follows. In the spot welder 1, the lifter 5 is divided into first to third lifters 51 to 53, and the third lifter 53 is configured to be rotatable with respect to the second lifter 52. When trying to move the position of the gun 4, the third lifter 53 rotates independently of the first and second lifters 51, 52. Thereby, the load accompanying the weight of the spot welding gun 4 and movement with respect to the whole lifter 5 with the movement of the spot welding gun 4 is not applied.

  Further, the cable 3 that connects the spot welding gun 4 and the welding machine main body 2 is held by the cable support 6. As a result, the weight of the tens of kilograms is present, and the weight and load of the cable 3 that are obstructive when the spot welding gun 4 is moved are not applied to the operator. Therefore, the operator can perform the welding operation while moving the spot welding gun 4 more easily.

  In particular, the cable support 6 is provided with casters K and can be moved independently of the welder body 2. Here, when the work is performed by moving the spot welding gun away from the welder main body 2, the work is conventionally performed by dragging the cable, and the weight of the cable is placed on the operator. In this regard, in the present embodiment, the work can be performed while moving the cable support 6 between the welding machine main body 2 and the spot welding gun 4. Therefore, the work efficiency can be improved without the operator having to bear the weight of the cable 3.

  By providing the suspending device 54 for suspending the spot welding gun 4 in the vicinity of the shaft portion 52e of the third lifter 53, it becomes easy to handle the wire extending and contracting from the suspending device, and the third lifter 53 is excessively large. Thus, the operator can easily rotate the third lifter 53 with respect to the second lifter.

  Since the cable support 6 is configured to be adjustable in height, for example, the height of the mounting portion 63 on which the cable 3 of the cable support 6 is mounted is set to a work height or a position higher than that depending on the operator. By adjusting, the load of the cable applied to the operator's hand can be reduced as much as possible.

  As described above, in the spot welder 1 of the present embodiment, the cable support 6 is provided separately from the welder main body 2 while the lifter is divided so that the tip portion can be rotated. By such a rotation of the lifter and the mounting of the cable by the cable support, the operator can easily move the spot welding gun 4 while holding the spot welding gun 4 by hand.

DESCRIPTION OF SYMBOLS 1 Spot welder 2 Welding machine main body 21 Main body apparatus 22 Main body part 3 Cable 4 Spot welding gun 41, 42 Electrode 5 Lifter 51 First lifter 52 Second lifter 52a Base part 52b End part 52c, 52d Pole 52e Shaft part 53 First 3 Lifter 53a Tip 53b Feeding roll 54 Suspension device 6 Cable support 61 Bottom 62 Pole 63 Mounting portion 63a Plate 63b Fixture A Arm C Connection F Fan G Gas springs K, K1, K2 Casters P Panel T Operation terminal W wire

Claims (3)

The welder body,
A spot welding gun connected via a cable from the welder body, and
A lifter standing on the welder body and supporting the spot welding gun;
A cable support that supports the cable between the spot welding gun and the welder body,
The lifter includes a first lifter attached in a vertical direction with respect to the welder body, a second lifter provided in a horizontal direction or an oblique direction from the first lifter, and the second lifter. The spot lift gun is suspended from the tip of the third lifter.
The cable support includes a bottom having a moving means, a pole standing on the bottom, and a mounting portion for mounting a part of the cable on the support. Machine.   2. The spot welding according to claim 1, further comprising a suspending device that hangs the spot welding gun by allowing a wire to expand and contract in the vicinity of the shaft support portion of the second lifter of the third lifter. Machine.   The spot welder according to claim 1, wherein the cable support is configured to be adjustable in height.