JP2002224848A - Portable spot welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable spot welding equipment capable of ensuring the safety of a spot welding repairing work, reducing heavy work, and improving the working efficiency by finely adjusting and controlling the balance of the weight balance at a worker's hand or in the vicinity thereof irrespective of the weight of a spot welding gun. SOLUTION: In this portable spot welding equipment, the spot welding gun (5) is suspended from a main swing arm (2) pivotably supported by an upper end of a main pole (1) provided on a welding machine body (W) via one or two horizontal swing arms (3) and a gun hunger (4), a middle part of the main swing arm (2) and the main pole (1) are connected to each other by a weight balancing means, an air cylinder (6) connected to an air pressure source via a control means is employed as the weight balancing means, an end part of a piston rod (8) is pivotably attached to the main pole (1) so that the height of the pivotably supporting position can be changed along the main pole (1), and the air cylinder (6) is controlled by the remote control at hand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable spot welding apparatus, and more particularly, to a portable spot welding apparatus having a balance adjusting means for a suspended weight of a swing arm for suspending a spot welding gun. It is.

[0002]

2. Description of the Related Art In a conventional portable spot welding apparatus of this kind, a main pole is erected on a main body of a welding machine which can be moved to a working position by a movable caster, and a main swing arm is provided at an upper end of the main pole. The base end was pivotally fixed and the suspension wire wound on the suspension reel provided on the main pole portion was wrapped around the trochanter provided on the main pole and the main swing arm, and provided at the tip of the wire. Hang the spot welding gun on the suspension hook,
2. Description of the Related Art It is known that a suspension height of a spot welding gun is changed by setting an angle of a main swing arm with respect to a main pole and a winding setting of a suspension wire.

The portable spot welding apparatus described above is preferable in terms of reducing the heavy labor of the welding operator because the weight of the spot welding gun can be borne by the suspension wire. If it is shifted up or down or left or right from the suspended state, it cannot be handled unless the setting is changed or the operator bears it, which leads to improvement of welding work efficiency and reduction of work load. It was an inhibitor.

In order to improve the welding efficiency and the work load, the main pole and the intermediate portion of the main swing arm are replaced with a compression coil spring or a gas spring balance support means instead of the wire suspension method. Concatenate,
A portable spot welding apparatus (e.g., a portable spot welding apparatus) in which a moment opposite to the direction of action of the rotational moment due to the weight of the spot welding gun suspended from the tip of the main swing arm acts to maintain a weight balance. Japanese Patent Application Laid-Open No. 2000-141055 and Japanese Patent Application No. 11-155090).

[0005]

Accordingly, the use of high-strength steel sheets as sheet metal members and the increase in the thickness of the bonnet, trunk, and cabin portions themselves, which are adopted for vehicle safety measures, are repaired and welded. It has become possible to secure strength, improve work efficiency, and reduce heavy labor in welding work.However, diversification of vehicle forms and the accompanying width of spot welding gun weights, that is, several kg to more than a dozen kg range,
Without incurring dangers such as sudden jumps and descents, the welding work could not be performed with the worker's burden being almost constant,
Portable spot welding equipment with different suspension capacities had to be used.

The cause is not limited to the increase in the weight due to the increase in the required electric capacity of the spot welding gun itself and the increase in the weight of the power supply cable, and also the structural change of the spot welding gun due to the diversification of the form of the welding portion. Compression coil springs that connect the main pole and the middle part of the main swing arm at a fixed pivot position, despite the widening of the difference in weight of the spot welding guns of various forms associated with
A portable spot welding apparatus having a structure in which a supporting resistance force is applied by a gas spring or a combination of a gas spring and an auxiliary air cylinder is used.

Of course, when a spot welding gun lighter or heavier than the weight capable of maintaining the balance of the weight balance is suspended, a compression coil spring or a gas spring corresponding to the weight is prepared and replaced. 3 ~
This can be achieved by installing several portable spot welding equipment equipped with compression coil springs or gas springs for 5, 5-7, 7-10, 10-12 kg.
This is not only extremely uneconomical in terms of capital investment, but also causes a decrease in the efficiency of welding work, an increase in the risk of high work danger risks in welding work, inconvenience due to extension of the waiting period for repair, and an increase in repair costs. it is obvious.

According to the present invention, in order to make the form of the spot welding gun correspond to the welding position, the electrodes are opposed to each other through an arm passing through a cable in a deep U-shaped or semicircular metal tube. Even if the weight of the growing spot welding gun and the current carrying cable is several times larger than that of the usual spot welding gun, the weight balance can be secured immediately over a wide range without installing several portable spot welding equipment. The present invention has been invented in order to meet the demand for a portable spot welding apparatus which is safe, efficient, and can reduce the welding work load of the operator to a degree corresponding to the suspension change of the corresponding spot welding gun.

That is, according to the present invention, regardless of the magnitude of the weight of the spot welding gun, the balance of the weight balance can be finely adjusted and controlled in accordance with the working environment and the working posture at or near the worker by the worker himself. As a result, the burden of supporting the weight of the operator due to the change in the suspension height of the spot welding gun, which has occurred in the rough change adjustment control, is remarkably reduced, thereby ensuring safety, improving welding work efficiency, It is an object of the present invention to provide a portable spot welding apparatus capable of effectively utilizing the technology of an aging expert, satisfying the high needs of quick and elaborate vehicle repair, shortening a repair waiting period, and reducing repair costs. I have.

[0010]

A portable spot welding apparatus according to the present invention comprises a main swing arm on an upper end of a main pole (1) erected on a welding machine main body (W) supported by a moving caster (C). While pivoting the base end of (2),
The middle part of the main swing arm (2) and the main pole
And (1) are connected by weight balance means, and a gun suspension (4) is provided at one end of the main swing arm (2) via one or two horizontal swing arms (3). A head main body (5c) having a base end of a main electrode rod (5a) attached to the gun suspension (4) so as to linearly advance and retreat by air pressure; and a sub-electrode opposed to the main electrode rod (5a). Spot welding gun (5) that is connected and fixed to the gun arm (5d) holding and fixing the rod (5b)
In that it is a device that clamps and welds a member to be welded between the tips of the main electrode rod (5a) and the sub electrode rod (5b). The configuration is basically the same.

The portable spot welding apparatus according to the present invention is characterized in that the main swing arm (2)
An air cylinder consisting of a single-acting cylinder or a single-rod double-acting cylinder piped from an air pressure source via a regulator, an electromagnetic switching valve and a speed controller to the balance support control means connecting the intermediate portion of the main pole and the main pole (1). (6)
The end of the piston rod (8) is pivoted to the main pole (1) so that the height of the pivot support position can be changed along the main pole (1), and the spot welding gun (5) is held The electromagnetic switching valve is supplied and exhausted by a remote operation switch (9) disposed near the welding operator or detachably attached to the spot welding gun (5).

[0012]

According to the configuration of the portable spot welding apparatus according to the present invention described above, first, the connection between the intermediate portion of the main swing arm (2) and the main pole (1) is adjusted to the height of the pivotally supported position. Can be set to change the air cylinder
By pivoting the end of (6) on the side of the piston rod (8) to the main pole (1), the moment acting in the opposite direction to the moment acting direction due to the weight of the spot welding gun (5) can be changed. Thus, an equilibrium area can be secured in a predetermined height range for each pivot position.

For this reason, if the center position (pivot position) of the moment in the opposite direction is changed according to the weight of the spot welding gun (5), when the height of the welding work position is changed up and down in the equilibrium region, Placed near or by a welding worker where the worker holds the spot welding gun (5) or spot welding gun
If the air supply / exhaust operation to the air cylinder (6) is performed by hand operation of the remote control switch (9) detachably attached to (5), the spot welding gun (5) will be extremely smooth and safe.
The weight balance can be balanced at the required height position.

A gun suspension (4) is provided at one end of the main swing arm (2) via one or two horizontal swing arms (3), and a spot welding gun (5) is suspended therefrom. When suspended, the operator applies a slight horizontal force to the spot welding gun (5) in the equilibrium region of the vertical weight balance, and the one or two horizontal swing arms (3) Not only can displace the spot welding gun (5) in the horizontal direction, but also the welding machine body (W)
And the interval between the welding operation position and the one or two horizontal swing arms (3) can be freely changed by the rotational adjustment setting. It is better to use two horizontal swing arms (3) .Even if only one horizontal swing arm (3) is used, the adjustment area is narrow, but the spot welding gun (5) can be displaced in the horizontal direction and the welding machine body (W ) And the distance between the welding work positions can be adjusted.

As described above, the main swing arm (2)
The spot welding gun (5) is suspended on a gun suspension (4) provided at the tip of the gun via one or two horizontal swing arms (3), near the welding operator. The middle part of the main swing arm (2) and the main pole (1) are controlled by an air cylinder (6) controlled by a remote operation switch (9) detachably attached to the arrangement or the spot welding gun (5). Spot welding is achieved by a synergistic configuration in which the end of the piston rod (8) of the air cylinder (6) is pivotally connected along the main pole (1) so that the height of the pivotally supported position can be changed and set. Regardless of the weight of the gun (5), it is possible to finely adjust and control the balance of the weight balance in accordance with the work environment and work posture, at or near the worker, regardless of the weight of the gun (5). The spot welding gas that occurred in the change control (5) It is possible to remarkably reduce the burden on the weight of the worker due to the change in the suspension height, thereby improving the welding work efficiency, making effective use of the skills of aging skilled workers, and promptly and precisely repairing vehicles. It is possible to provide a portable spot welding apparatus capable of satisfying high needs, shortening a repair waiting period, and improving repair cost.

[0016]

DETAILED DESCRIPTION OF THE INVENTION AND

DESCRIPTION OF THE PREFERRED EMBODIMENTS A portable spot welding apparatus according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view, and FIG. 2 is a holder for changing a pivotal position attached to a main pole (1). 7) Perspective view of part, Fig. 3 is horizontal swing arm
FIG. 4 is a front view showing a connecting part in which an intermediate portion of the main swing arm (2) and the main pole (1) are connected by an air cylinder (6) with a cross section of (3), and FIG. FIG. 5 is a remote control switch (9) in which an air cylinder (6) is detachably attached to a spot welding gun (5).
FIG. 5 is an explanatory diagram of control in the case where control is performed by using.

The portable spot welding apparatus according to the first embodiment comprises a welding machine main body (W) having a main pole (1) supported by a moving caster (C), and a base end provided at an upper end of the main pole (1). The main swing arm (2) to which the part is pivoted, a single-acting air cylinder (6) connecting the middle part of the main swing arm (2) and the main pole (1), and the main pole (1) A fixed position changing holder (7) for fixing one end of the piston rod (8) of the air cylinder (6) and a second shaft sequentially pivoted on the vertical axis to the tip of the main swing arm (2). One horizontal swing arm (3a) and second horizontal swing arm (3b)
And a gun suspender (4) rotatably mounted on the free end of the second horizontal swing arm (3b) around a vertical axis, and a spot welding gun (5) detachably provided with a remote control switch (9). Five)
And the control unit (1
0), and the configuration of each unit will be described below.

First, the main pole (1) is formed of a pipe having a diameter of 50 mm, and is fixed to the welding machine main body (W) with an upper end height of 2 m, and a plate member is attached to the upper end of the main pole (1). A U-shaped bracket (11) for pivoting, which is bent into a letter shape so as to grip the main pole (1), is fixed with bolts and nuts penetrating the main pole (1) in the radial direction.

A pivot hole for pivotally connecting one end of each of two base arm (2a) and one end of a regulating arm (2b) constituting a main swing arm (2), which will be described later, is provided in the U-mounting bracket (11). But,
The two arms are vertically drilled at an interval.

The main swing arm (2) is a base arm.
(2a) and the regulating arm (2b), which are arranged in parallel with the base arm (2a) as the lower side, and the vertical swing rotation is caused by the overlap of the base arm (2a) and the regulating arm (2b). In order to constitute a parallel movement mechanism for restricting the restraint, each base end is pivotally attached to the pivoting U-bracket (11) and the distal end is pivotally attached to the head link member (12).

The air cylinder (6) connecting the intermediate portion of the main swing arm (2) and the main pole (1) is a single-acting type having a supply / exhaust port (6a). Base arm (2a) constituting the main swing arm (2)
Pivotally attached to the support bracket (13) fixed at the middle position in the longitudinal direction of
The other end (8a) of the piston rod (8) is pivotally attached to a pivoting position changing holder (7) fixed below the pivoting U-bracket (11) fixed to the main pole (1).

As shown in a perspective view of FIG. 2, a plurality of pivotally supporting recesses (FIG. 2) are used to pivotally connect the pivoting position changing holder (7) and the other end (8a) of the piston rod (8). 7a) is communicated with a shaft passage (14) formed in the vertical direction, and a main pole is formed by two mounting plates (15) in which a plurality of pivotally supporting recesses (7a) are stepped in the vertical direction.
(1) A piston rod (8) provided with a pivot hole between the mounting plate (15) of the pivoting position changing holder (7) portion fixed with the
The other end (8a) is interposed, and both ends are supported by penetrating a pivot shaft having male screws at both ends. Predetermined pivotal support recess (7a)
The pivot axis can be changed and fixed.

A head link member (12) for pivotally connecting the base arm (2a) of the main swing arm (2) and the distal end of the regulating arm (2b) is located adjacent to the arm pivot position. The inverted U-shaped support part (16) is formed.
Insert one end of a first horizontal swing arm (3a) having shaft holes formed vertically at both ends in (16), and penetrate a bending shaft that is tightened and loosened by operating the lock lever (17). The first horizontal swing arm (3a) is connected to rotate in the horizontal direction.

A handle (18) is provided in the shaft hole at the other end of the first horizontal swing arm (3a) made of a metal square member of about 40 cm.
The vertical axis with a screw (1
The threaded longitudinal axis (19) of the second horizontal swing arm (3b) provided at one end of the second horizontal swing arm (3b) penetrates from the bottom upward, and is screwed to the fixing handle.

The second horizontal swing arm (3b) has a size of 40 cm.
A link block (20) with a vertical axis (19) with a screw for turning and fixing freely by operating the handle (18) is integrally formed at the base end of the metal round bar member And
At the free end, a suspension shaft hole is provided for suspending the gun suspension tool (4) rotatably about a vertical axis.

The gun suspending device (4) has a U-shaped bracket mounted on a vertical axis for rotatably mounting on the free end of the second horizontal swing arm (3b). The U-shaped bracket (4a) is secured to the U-shaped bracket (4a). hook
(4b) is provided, and the spot welding gun (5) is hooked and supported on the safety hook (4b).

The spot welding gun (5) is provided at the base end of the main electrode rod (5a) so as to linearly advance and retreat by air pressure controlled and supplied from a piping path different from the air path to the air cylinder (6). A gun arm (5d) holding and fixing a head main body (5c) having attached thereto, and a sub electrode rod (5b) facing the main electrode rod (5a).
The remote control switch (9) for controlling the supply and exhaust of air to the air cylinder (6) and controlling the swing of the main swing arm (2) is attached to and detached from the hand grip for holding work The main electrode rod (5a) and the sub-electrode rod (5b) are sandwiched between the tips of the main electrode rod (5a) and the sub-electrode rod (5b) and are welded. is there.

As shown in FIG. 1, the control unit (10) is provided in the welding machine main body (W). The control unit (10) includes a swing control unit for the cylinder (6) and a spot welding unit. A control unit for supplying / exhausting air to the head main body (5c) of the gun (5) is provided. Regarding the former swing control unit, as shown in FIG. 5, an example of control piping of the cylinder (6) is provided. Air from the pressure source (P) is transferred to the cylinder via the solenoid on-off valve (21) and throttle valve (22).
(6) is supplied to a supply / exhaust port (6a), and the exhaust by gravity is controlled by an electromagnetic exhaust valve (23), and the electric control is performed by a remote control provided in a spot welding gun (5). The operation of the operation switch (9) is controlled through a control circuit wired on the circuit board (24). The latter is a conventional spot welding gun for the air supply / exhaust control unit to the head main body (5c).
Since there is no difference from the air supply / exhaust control to the head main body (5c) of (5), it is omitted from the drawing, but the air from the air pressure source is supplied to the spot welding gun (5) via a regulator, an electromagnetic switching valve, and a speed controller. ) Is controlled so as to supply / evacuate the head main body (5c). With this control, the main electrode rod (5a) is linearly advanced and retracted, and the main electrode rod (5c) is moved.
Welding is performed by applying a welding pressure to the work between a) and the auxiliary electrode rod (5b).

In the above embodiment, the end of the piston rod (8) of the air cylinder (6) connecting the intermediate portion of the main swing arm (2) and the main pole (1) is supported by a plurality of pivotally supporting members. A pivot position changing holder (7) in which the concave portion (7a) communicates with a shaft passage (14) formed in the vertical direction and is supported by a plurality of pivot support concave portions (7a) provided in the vertical direction. Although the configuration has been described as a configuration in which the pivot is changed by a part, the main pole (1) may be provided with a plurality of similar pivotal support recesses (7a) and directly supported. In this case, if a pipe having a square cross section is used, a plurality of pivoting support recesses (7
The formation processing of a) is easy, and the strength of the main pole (1) can be secured.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a portable spot welding apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a pivoting position changing holder (7) mounted and fixed to the main pole (1).

FIG. 3 is an exploded side view schematically showing a part of the portable spot welding apparatus according to the embodiment of the present invention. It is a detailed view of a part.

FIG. 4 is a front view showing a vertical swing state of the connecting component.

FIG. 5 is a control explanatory diagram when the air cylinder (6) is controlled by a remote control switch (9) detachably attached to the spot welding gun (5).

[Explanation of symbols]

 (W) Welding machine body (G) Welding gun (C) Moving caster (1) Main pole (2) Main swing arm (2a) Base arm (2b) Restriction arm (3) Horizontal swing arm (3a) First horizontal Swing arm (3b) Second horizontal swing arm (4) Gun suspension (4a) U bracket (4b) Safety hook (5) Spot welding gun (5a) Main electrode rod (5b) Sub electrode rod (5c) Head body (5d) Gun arm (6) Air cylinder (7) Pivot position change holder (7a) Pivot support recess (7b) Fixing operation handle (8) Piston rod (8a) Other end (9) Remote control switch (10) Control unit (11) U-bracket (12) Head link member (13) Support bracket (14) Shaft passage (15) Mounting plate (16) Reverse U-shaped support (17) Lock lever (18) ) Handle (19) Vertical axis with screw (20) Link block (P) Air pressure source (21) Solenoid on-off valve (22) Throttle valve (23) Electromagnetic exhaust valve (24) Circuit board

Claims (3)

[Claims] 1. A base end of a main swing arm (2) is pivotally mounted on an upper end of a main pole (1) erected on a welding machine main body (W) supported by a moving caster (C). The middle part of the main swing arm (2) and the main pole (1) are connected by weight balance means, and one or two horizontal swing arms (3) are provided at the tip of the main swing arm (2). A gun suspension tool (4) is provided through the gun suspension tool (4).
The head main body (5c) to which the base end of the main electrode rod (5a) is attached so as to linearly advance and retreat by air pressure, and the main electrode rod (5a)
The gun arm (5) holding and fixing the sub electrode rod (5b) facing
d) and a spot welding gun (5), which is fixedly connected to the main electrode rod (5a) and the auxiliary electrode rod (5b). In a portable spot welding apparatus adapted to perform welding, an intermediate portion of the main swing arm (2) and a main pole are provided.
The balance support control means for connecting to (1) is a piston rod of an air cylinder (6) consisting of a single-acting cylinder or a single-rod double-acting cylinder which is piped from an air pressure source via a regulator, an electromagnetic switching valve and a speed controller. Welding work that pivotally attaches the end of (8) to the main pole (1) so that the height of the pivot support position can be changed along the main pole (1) and holds the spot welding gun (5) The electromagnetic switching valve is supplied and exhausted by a remote operation switch (9) disposed near the user or detachably attached to the spot welding gun (5), according to the weight of the spot welding gun (5). Portable spot welding apparatus characterized in that balance control can be performed at or near a welding operator. 2. The height of the pivotally supported position is adjusted by the main pole (1).
The means for changing and setting along the plurality of pivot support recesses (7a)
The main pole () is connected to a pivot passage (14) formed in the vertical direction and supported by a plurality of pivotally supporting recesses (7a) provided in the vertical direction. 1), the pivot shaft provided at the end of the piston rod (8),
2. The structure according to claim 1, wherein the spot welding gun is supported by one of the pivotal support recesses according to the weight of the gun.
A portable spot welding apparatus as described. 3. The main swing arm (2) comprises a regulating arm (2b) with the base arm (2a) being on the lower side, and the main swing arm (2) performs vertical swing rotation of the main swing arm (2). The end of the air cylinder (6) is pivotally attached to the base arm (2a) so that the end of the air cylinder (6) is controlled by means constituting a parallel movement mechanism that restricts and restricts the overlap by the (2a) and the regulating arm (2b). Item 3. A portable spot welding apparatus according to Item 1 or 2.