JP2881730B2 - Spot welding machine holding device and spot welding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for assisting a spot welding machine for performing a spot welding operation while holding it by an operator and facilitating the welding operation, and operating the spot welding machine. The present invention relates to a spot welding machine holding device and a spot welding device that reduce the burden of a worker on welding work.

[0002]

2. Description of the Related Art A spot welder is generally used for lap joining of relatively thin metal plates and the like, similarly to a bolted structure and a riveted joint structure. This spot welding has various advantages as follows. In spot welding,
Mechanical rigidity is maintained because no holes are made in the metal plate,
High joining efficiency can be obtained. Further, the joining pitch can be reduced, a high degree of secrecy against oil, gas, or water can be obtained, and the surface accuracy of the joining surface can be maintained.

[0003] On the other hand, spot welding requires a small joining pitch in places where stress concentration is severe because of a small slip coefficient. Further, the strength against peeling force or the strength against repetitive load in the peeling direction is inferior to that of a rivet bonding structure or the like, and also has the disadvantage that the mechanical strength is not uniform. A spot welder used for spot welding having such features is, for example, a method in which two metal plates are used as members to be welded, these two metal plates are overlapped, and a pair of welding electrodes press and hold. In the state
Electric current is applied between the welding electrodes, and the two metal plates are welded in a spot shape by Joule heat generated between the welding electrodes and the metal plate.

That is, the spot welding machine is composed of a pair of welding electrodes for clamping a member to be welded in a pressurized state, a power supply unit including a transformer (transformer) for supplying a current to these welding electrodes, a control unit, and the like. I have. As the power supply unit, various power supply units such as a single-phase AC type, a three-phase type, and a storage type are used. There is also a portable spot welding machine in which a transformer, a power supply unit, and a control unit are separated. The single-phase AC power supply has a simple structure and is easy to control and handle. The three-phase power supply uses three-phase alternating current, which is advantageous for large capacity. Further, in the energy storage type power supply, electrostatic energy is stored in a capacitor (capacitor) and discharged through a primary coil, and welding between members to be welded is performed using a secondary current flowing at that time.

The control unit controls the time for supplying current to the welding electrodes and the pressure at which the welding electrodes press the member to be welded. The control unit is configured using, for example, a current switching device, a conduction time control device, a sequence control device, and the like. There are mainly three types of current switchgear: an electromagnetic switch, a discharge tube switchgear or a mechanical switchgear. In particular, discharge tube control for controlling the welding current with an ignitron is extremely effective. The energization time control device is constituted by a timer. The sequence control device is in charge of a series of control operations such as a sandwiching operation of a member to be welded by a welding electrode, a supply control operation of a current to the welding electrode, or an opening operation of a welding electrode from the member to be welded.

[0006] The welding electrode is made of a material having high thermal conductivity and conductivity, and is composed of, for example, a copper alloy electrode to which cadmium, chromium, titanium, beryllium or the like is added.
An appropriate electrode shape is selected for the welding electrode according to the current distribution, the pressure distribution of the member to be welded, the cooling effect, and the like. In addition, in order to maintain welding accuracy, the welding electrode needs to be sufficiently managed with respect to a temporal change in shape due to long-term use. As the shape of the welding electrode,
For example, various shapes are known, such as a C-type having a sharp tip, an R-type having a round shape, and a CF-type having a trapezoidal shape.

Further, the welding electrode is generally provided with a cooling system constituted by a passage or the like through which air or water is circulated. This cooling system acts to control the temperature rise at the peripheral portion of the joint of the member to be welded to which the welding electrode is applied, so that the joint is locally heated to a high temperature. The spot welding machine is configured to be a movable type that allows the pair of welding electrodes to freely contact and separate from each other because it is necessary to press and hold the member to be welded by the pair of welding electrodes. In this case, the spot welding machine generally uses one of the welding electrodes as a fixed type and positions the other welding electrode on the fixed welding electrode by a driving mechanism such as an air cylinder in order to position a welding position with respect to the workpiece. It is configured as a movable type that moves toward and away from it.

Therefore, in such a spot welding machine, the movable welding electrode is moved toward the fixed welding electrode via the drive mechanism in a state where the fixed welding electrode is positioned and applied to a desired welding position of the member to be welded. By doing so, the member to be welded is pressed and held by the fixed side welding electrode and the movable side welding electrode. The principle of spot welding is to apply a current to a welding electrode holding a member to be welded under pressure, thereby welding the member to be welded in a spot shape. That is, when a current flows between the welding electrodes, the temperature of the joined portion of the two superposed welded members rapidly rises due to heat generated by contact resistance and softens. The softened joint is pressurized by the joint electrode and deformed by the pressure to reduce the contact resistance, but heat generation is promoted by an increase in the resistance of the base material itself due to a rise in temperature, and is locally melted. .

[0009] Even when the supply of current to the welding electrodes is stopped, the joint is still pressed and held by these welding electrodes, and is solidified by this pressure while keeping in close contact. In this way, the joints are locally welded to each other to complete the welding. In the spot welding machine described above, in order to improve welding efficiency or to reliably weld between the joints of the members to be welded, a pair of welding electrodes opposed to each other have their axes aligned with each other, and Must be clamped under pressure. Therefore, the movable welding electrode
At the time of the moving operation, the fixed welding electrode is configured so as to come in contact with and separate from the fixed welding electrode while maintaining the axis.

Incidentally, since the spot welding machine is provided with a head portion having welding electrodes, a power transformer, and the like, the overall weight is relatively large even if it is a portable type. However, spot welders are generally used, for example, in automobile repair shops to perform spot welding on the body of an automobile. In such spot welding, a worker must work while entering a narrow place while holding a heavy spot welder, and not only is the worker forced to work hard,
You are at risk.

To solve such a problem, for example, it is conceivable to carry out spot welding work by holding the spot welding machine body by a so-called magic hand device, that is, a manipulator or a robot device. However, even though the manipulator is suitable for simply moving the spot welder to a certain specified place accurately, it is not possible to move the spot welder to the back of the car body or to a narrow part to perform delicate work. Have difficulty. Further, since the manipulator becomes large-scale and the handling is troublesome, it is difficult to put the manipulator to practical use at all.

In particular, a spot welding machine in which the head portion is rotatable with respect to the main body portion can greatly improve the efficiency of the spot welding operation itself, but the weight is reduced. This does not mean that the problem of handling cannot be solved. Therefore, even if the spot welding machine is used at a repair shop of an automobile or the like and the spot welding location is not uniform, it is not possible to improve the overall work efficiency. Accordingly, the present inventor has attempted to improve the efficiency of spot welding work by enabling a relatively heavy spot welder to be easily operated, as shown in Japanese Patent Application Laid-Open No. 8-309558.
We have proposed a spot welding device that greatly reduces the burden on workers.

In the spot welding apparatus disclosed in Japanese Patent Application Laid-Open No. 8-309558, at least one of the welding electrodes is opposed to and separated from the other welding electrode by a drive mechanism. A spot welding machine body having a built-in power transformer for supplying a welding current between the welding electrodes, a base detachable from a chassis of the spot welding machine body, and supported rotatably with respect to the base. A connection device connected to connection means of a balancer device for suspending and supporting the spot welding machine body at a predetermined position.

According to the spot welding apparatus having the structure as disclosed in JP-A-8-309558, the connecting device is connected to connecting means drawn from a balancer device suspended on a ceiling or the like, so that the weight is relatively large. The spot welding machine main body is usually suspended and supported at a predetermined height position. The spot welding machine body is pulled out with a small force during the spot welding operation, so that the connecting means is further extended from the balancer device, and can be moved to the joint of the members to be welded. In addition, the spot welding machine main body is rotatably supported with respect to the connecting device, so that the welding electrode can be accurately positioned, for example, even in a narrow place.

When the spot welding operation is completed, the operator releases the hand held by the operator, and is again suspended and held at a predetermined height by the balancer device. The spot welding machine main body can be suspended and held at a desired position by adjusting the feeding amount of the connecting means of the balancer device.

[0016]

However, in the configuration disclosed in Japanese Patent Application Laid-Open No. Hei 8-309558, the spot welding machine main body is simply suspended and supported by the balancer device via a rotatable connecting device. In automobile repair shops, etc., spot welding is often performed on or near bent parts such as flanges formed on the periphery of each member constituting an automobile body.・ Work must be performed while maintaining the posture. When the spot welder is held in various orientations and postures as described above, according to the configuration disclosed in Japanese Patent Application Laid-Open No. H8-309558, most of the weight of the main body of the spot welder is supported by the operator, and the balancer device is used. Is merely reducing the load when moving the spot welding machine main body except for the downward posture.

In the drawings and the specification of Japanese Utility Model Application Laid-Open No. 55-35555, a relatively simple structure such as pliers for opening and closing a pair of opposed welding electrodes with respect to an axis of a base end is disclosed. Is shown in such a configuration that the spot welding machine main body is rotatably supported near the center of gravity and suspended from a ceiling beam or the like. In this case, a configuration in which the rotation support portion is linearly connected to a hanging rope or the like from a ceiling beam or the like and a configuration in which the rotation support portion is bent and connected to the hanging rope or the like are shown. In each case, it is assumed that the support is provided near the center of gravity.

With such a configuration, each electrode of the pair of welding electrodes is rotated in accordance with the opening and closing operation, and the axis between the electrodes is rotated in the vicinity of the center of gravity like a spot welding machine in which the axis moves in an arc shape. It can be applied only to a limited type of spot welder having a space that can be supported. Therefore, the technique disclosed in Japanese Utility Model Laid-Open No. 55-38555 is a technique intended only for a spot welder having a special shape, and is a general technique including a spot welder body disclosed in JP-A-8-309558. It cannot be applied to a simple spot welding machine.

The present invention has been made in view of the above circumstances, and can be applied to any type of spot welder. When the spot welder is operated in any orientation and posture, the balancer can be used. It is an object of the present invention to provide a spot welding machine holding device and a spot welding device capable of effectively applying the load of the device and reducing the burden on the operator. In particular, an object of the invention of claim 1 is to allow the spot welder to be suspended and supported by the balancer device at a position near the center of gravity even when the spot welder is operated in any orientation and posture, thereby effectively reducing the burden on the operator. It is an object of the present invention to provide a spot welding machine holding device capable of reducing the number of times.

It is an object of the present invention to provide a spot welding machine holding apparatus which can suspend and support the spot welding machine at a position substantially near the center of gravity with a particularly simple structure. A third object of the present invention is to provide a spot welding machine holding apparatus which can suspend and support the spot welding machine at a position substantially near the center of gravity with a particularly simple configuration. It is an object of the invention of claim 4 to provide a spot welding machine holding device capable of suspending and supporting a spot welding machine at a position substantially near the center of gravity with a particularly simple configuration. It is an object of the invention of claim 5 to provide a spot welding machine holding device capable of suspending and supporting a spot welding machine at a position substantially near the center of gravity with a particularly simple configuration.

It is an object of the present invention to provide a spot welding machine holding device capable of reducing the burden on an operator particularly safely. An object of the invention of claim 7 is to provide a spot welding machine holding device that can ensure the safety of an operator with a particularly simple configuration. An object of the invention of claim 8 is to provide a spot welding machine holding device which can suspend and support the spot welding machine at a position substantially near the center of gravity with a particularly simple configuration.

The object of the invention of claim 9 is to provide a work in which the spot welder main body is suspended and supported by the balancer device at a position substantially near the center of gravity even when the spot welder main body is operated in any orientation and posture. It is an object of the present invention to provide a spot welding apparatus capable of effectively reducing a burden on an operator. It is an object of the present invention to provide a spot welding apparatus capable of improving the operability of an operator.

[0023]

According to a first aspect of the present invention, there is provided a spot welding machine holding apparatus according to the present invention, wherein a supporting base for fixing a front surface to a side surface of the spot welding machine is provided. A predetermined gap is provided on the back side of the support base, and the base is rotated parallel to the back side of the support base about an axis perpendicularly protruding to a position substantially corresponding to the vicinity of the center of gravity of the spot welder in a fixed state on the back side of the support base. As possible,
Attached to the back surface of the support base, and formed at a substantially right angle toward the front side of the support base near the rotation end,
A first connecting arm extending substantially parallel to the axis, and a base end of the first connecting arm from a bent portion of the first connecting arm on a rotating end side of the first connecting arm. And a portion corresponding to a distance between the center of gravity of the spot welding machine in a fixed state and rotatably connected about an axis parallel to a base end of the first connection arm, and the first connection A second connecting arm that is sufficiently long compared to a distance between the arm and the bent portion, and is configured to be connected to a wire of the balancer device at a tip of the second connecting arm. It is characterized by:

According to a second aspect of the present invention, there is provided the spot welding machine holding apparatus, wherein the first connecting arm has a rotating shaft projecting vertically from a back side of the support base and the rotating shaft. And a bearing portion fixed to the base end of the first connecting arm and coupled to the support base.

According to a third aspect of the present invention, in the spot welding machine holding apparatus, the first connecting arm is fitted to a bearing portion vertically protruding from a back side of the support base and the bearing portion. The first connecting arm is coupled to the supporting base by a configuration including a rotating shaft protruding from a side of the base end of the first connecting arm.

According to a fourth aspect of the present invention, in the spot welding machine holding apparatus according to the present invention, the second connecting arm includes the first connecting arm.
A bearing portion having an outer surface fixed to a rotating end of the connecting arm, and a rotating shaft fitted into the bearing and projecting laterally from the base end of the second connecting arm. It is characterized in that it is coupled to the support base by a configuration including the above.

According to a fifth aspect of the present invention, there is provided the spot welding machine holding device according to the present invention, wherein the second connecting arm is provided with the first connecting arm.
A pivot shaft protruding laterally from a pivot end of the coupling arm; and a bearing portion pivotally supported by the pivot shaft and having an outer surface fixed to a base end of the second coupling arm. And being connected to the support base by a configuration including:

[0028] The spot welding machine holding device according to the present invention as set forth in claim 6 is characterized in that it further comprises stopper means for limiting a rotation range of the first connecting arm with respect to the support base. In the spot welding machine holding device according to the present invention described in claim 7, the stopper means includes:
It is characterized by including a stopper pin protruding from the support base. The spot welding machine holding device according to the present invention as set forth in claim 8, further comprising a hook member connected to a rotating end of the second connecting arm and connected to a wire of the balancer device. And

According to a ninth aspect of the present invention, there is provided a spot welding apparatus, comprising: a spot welding machine main body; a support base for fixing a front surface to a side surface of the spot welder main body; The spot welding machine fixed to the back of the support base is rotatable in parallel with the back of the support base around an axis perpendicularly proximate to a position substantially corresponding to the center of gravity of the spot welding machine, and is attached to the back of the support base. A first connecting arm that is bent substantially at right angles toward the front surface of the support base near the turning end and extends substantially parallel to the axis; and a turning end of the first connecting arm. From the bent portion of the first connecting arm,
Outside the portion corresponding to the distance between the base end of the connecting arm and the center of gravity of the spot welding machine body in a fixed state, about an axis parallel to the base end of the first connecting arm. A second connection arm that is connected as possible and is sufficiently long compared to the distance between the first connection arm and the bent portion; and a second connection arm that is connected via a wire to a distal end of the second connection arm. And a balancer device.

A spot welding apparatus according to a tenth aspect of the present invention is characterized in that the balancer apparatus includes a constant tension spring whose winding tension is substantially constant irrespective of the feeding amount.

[0031]

That is, in the spot welding machine holding apparatus according to the first aspect of the present invention, there is provided a spot welding machine in which a predetermined gap is present on the back side of the support base for fixing the front side to the side face of the spot welder and the spot is fixed to the back side of the support base. A first connecting arm is attached to the back surface of the support base so as to be rotatable in parallel with the back surface of the support base around an axis projecting perpendicularly to a position substantially corresponding to the vicinity of the center of gravity of the welding machine. An arm is formed to be bent at a substantially right angle toward the front surface of the support base near the rotation end, so as to extend substantially parallel to the axis, and the rotation end side of the first connecting arm is formed. Out of a position corresponding to a distance between a bent portion of the first connection arm and a center of gravity of the spot welding machine in a fixed state from the bent portion of the first connection arm.
And a second connecting arm, which is sufficiently long compared to the distance between the bent portion of the first connecting arm and the second connecting arm, is rotatable about an axis parallel to a base end of the connecting arm. And a distal end of the second connecting arm is connected to a wire of the balancer device.

With this configuration, even when the spot welder is operated in any orientation and posture, the spot welder is suspended and supported by the balancer at a position substantially near the center of gravity, thereby effectively reducing the burden on the operator. can do.

In a spot welding machine holding apparatus according to a second aspect of the present invention, the first connecting arm has a bearing portion supported by a rotating shaft vertically projecting from a back surface of the support base. A portion is fixed to the base end of the first connection arm, and is coupled to the support base. With such a configuration, the spot welder is suspended and supported at a position substantially near the center of gravity with a particularly simple configuration.

According to a third aspect of the present invention, in the spot welding machine holding apparatus, the first connecting arm is provided with a rotating shaft portion inserted into a bearing portion vertically projecting from a back surface of the support base. The first connection arm is coupled to the support base by a configuration protruding from the base end side. With such a configuration, the spot welder is suspended and supported at a position near the center of gravity with a simple configuration.

According to a fourth aspect of the present invention, there is provided the spot welding machine holding device, wherein the second connecting arm is pivotally mounted on a bearing having an outer surface fixed to a rotating end of the first connecting arm. And the rotation shaft portion is connected to the support base by a configuration in which the rotation shaft portion protrudes laterally from the base end portion of the second connection arm. With such a configuration, the spot welder is suspended and supported at a position near the center of gravity with a simple configuration.

According to a fifth aspect of the present invention, in the spot welding machine holding apparatus, the second connecting arm is pivotally mounted on a rotating shaft portion protruding laterally from a rotating end of the first connecting arm. The supported bearing is fixed to the base end of the second connecting arm on the outer surface, and is coupled to the support base. With such a configuration, the spot welder is suspended and supported at a position near the center of gravity with a simple configuration.

[0037] The spot welding machine holding device according to claim 6 of the present invention further includes stopper means for limiting a rotation range between the support base and the first connecting arm. With such a configuration, the burden on the worker can be reduced safely without the risk of the worker pinching the hand. In a spot welding machine holding device according to a seventh aspect of the present invention, the stopper means includes a stopper pin projecting from the support base. With such a configuration, the safety of the worker can be secured with a particularly simple configuration.

[0038] The spot welding machine holding device according to claim 8 of the present invention further includes a hook member connected to a rotating end of the second connecting arm for connecting to a wire of the balancer device. With such a configuration, the spot welder is suspended and supported at a position substantially near the center of gravity with a particularly simple configuration.

According to a ninth aspect of the present invention, there is provided a spot welding apparatus, wherein a predetermined gap is provided on a back surface of a support base for fixing a side surface of the spot welder main body, and the center of gravity of the spot welder main body is fixed to the back surface of the support base. A first connecting arm is attached to the back surface of the support base so as to be rotatable in parallel with the back surface of the support base around an axis projecting perpendicularly to a position substantially corresponding to the vicinity, and the first connection arm is rotated. In the vicinity of the end, the support base is bent substantially at right angles toward the front surface side of the support base, and is formed so as to extend substantially parallel to the axis. Outside of a portion corresponding to the distance between the bent portion of the first connection arm and the center of gravity of the spot welding machine in a fixed state from the bent portion of the first connection arm. Parallel to base end A second connecting arm, which is rotatable about an axis and is sufficiently long compared to a distance between the first connecting arm and the bent portion, is connected, and a tip of the second connecting arm. Is connected to the wire of the balancer device.

With this configuration, even when the spot welding machine body is operated in any orientation and posture, the spot welding machine body is suspended and supported by the balancer at a position substantially near the center of gravity, and the burden on the operator is effectively reduced. Can be reduced. In a spot welding apparatus according to a tenth aspect of the present invention, the balancer apparatus includes a constant tension spring having a substantially constant winding tension regardless of a feeding amount. With such a configuration, the spot welding machine main body can be stopped at an arbitrary height, and in particular, the operability of the operator can be improved.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a spot welding machine holding device according to the present invention will be described in detail based on embodiments with reference to the drawings. 1 and 2 show the configuration of a spot welding machine holding device according to one embodiment of the present invention. FIG. 1 is a front view of the spot welding machine holding device, and FIG. 2 is a right side view thereof.

The spot welding machine holding device 101 shown in FIGS. 1 and 2 has a mounting plate 1 as a supporting base, a first connecting arm 2 as a first connecting arm, and a second connecting arm 2 as a second connecting arm. A connecting arm 3 and a connecting member 4 as a hook member are provided. The mounting plate 1 is a spot welding machine main body 102 (hereinafter, referred to as a “welding gun”).
And fix it. In this case, although not shown, the welding gun 102 is provided with a welding electrode, that is, a fixed welding electrode 102d and a movable welding electrode 102e, which will be described later, projecting upward, and the mounting plate 1 is provided on a side surface of the welding gun 102. Is fixed. The welding gun 102 will be described later.

As shown, the mounting plate 1 has one end edge (FIG. 1).
(In the vicinity of the lower end) is bent at a right angle to form a bottom contact portion 1a. At the center of the back surface of the mounting plate 1 (the surface not in contact with the welding gun 102), a first rotating shaft 11 is protruded. A first connecting arm 2 is provided above the first rotating shaft 11 (fixed shaft for the welding gun 102) of the mounting plate 1 (corresponding to the direction in which the welding electrode portion of the welding gun 102 projects). A stopper pin 12 serving as a stopper means is protruded at an appropriate position so as not to make contact with the welding electrode and not to hinder the operation of the switch.

As shown in FIG. 2, the stopper pin 12
Although it is protrudingly provided at a location, it is not only fixedly provided at a preset position, but also some mounting holes 12a and the like are provided in advance, and the mounting position can be adjusted by changing to a position as desired. You may be able to. The welding gun 102 is fastened and fixed to the mounting plate 1 by, for example, one or more bolts 13. At this time, the axis of the first rotating shaft 11 of the mounting plate 1 passes near the center of gravity of the welding gun 102.

The first connect arm 2 is bent at a right angle at a predetermined size as shown in FIG. A first bearing 21 is fixed to one end (substrate) of the first connect arm 2. The outer peripheral surface of the first bearing 21 is
For example, the first connect arm 2 is formed by brazing, welding or the like.
Are welded to the one end and are fixedly connected with sufficient strength. For example, two rows of annular ball bearings 22 are fitted in the first bearing portion 21. The first bearing 21 is rotatably coupled to the first rotating shaft 11 implanted on the mounting plate 1 via a ball bearing 22.

The ball bearing 22 has a plurality of steel balls sandwiched between inner and outer annular housings. The first bearing 11 is fixed to the mounting plate 1 by the mounting screw 5. The first bearing portion 21 and the ball bearing 22 are prevented from falling off by the washer 6 and the bearing holding bolt 7 so as not to be separated from each other. At the other end of the first connect arm 2, that is, at the tip of the bent portion, a second bearing portion 23 is fixed substantially corresponding to the position of the center of gravity of the welding gun 102 in the bending direction. For example, two ball bearings 24 are fitted inside the second bearing portion 23.

The second connecting arm 3 is a second connecting arm, and has a substantially linear shape as shown in FIG. 2, and has a second rotating shaft 31 protruding laterally at the base end. I have. Second
The rotating shaft 31 is rotatably connected to the second bearing 23 via a ball bearing 24 at the tip of the first connect arm 2. The second bearing 23 is
A side peripheral portion of the first connect arm 2 is fixed to the distal end portion by welding or the like. The ball bearing 24 and the second rotation shaft 31 are inserted into through holes formed in the second rotation shaft 31 so as not to be separated from each other, and are inserted into female screw holes formed in the second connect arm 3. The bearing holding bolt 8 is screwed to prevent the bearing from falling off. The second connect arm 3 is connected to an end of the second pivot shaft 31 (FIG. 1).
It is desirable that the two be fixed to each other by electric welding in a state of contact with the concave groove formed on the lower surface.

At the distal end of the second connect arm 3, a connecting member 4 as a hook member, which is U-shaped and is supported at the open end side with the distal end of the second connect arm 3 interposed therebetween, is provided. ing. The connection member 4 is connected to a wire fed from the balancer device. FIG. 3 shows an example of a spot welding apparatus configured using the spot welding machine holding device 101 as described above.

The spot welding apparatus shown in FIG. 3 includes a spot welding machine holding device 101 and a welding gun 102,
Welder control unit 103, mast member 104, boom member 1
05, gas pressure arm 106, spring balancer 10
7, hanging wire 108, roller 109, connection wire bundle 110
And an air tube 111. A welding gun 102 is fixed to the spot welding machine holding device 101.

The welding machine control unit 103 includes a wheel 1 for movement.
A power supply for supplying a welding current of the welding gun 102 and an air controller for supplying air for operating the movable welding electrode and cooling are provided. A mast member 104 is provided upright on the welding machine control unit 103. At the tip of the mast member 104, the boom member 10 is rotatably
5 are connected at one end.

The boom member 105 is configured to be able to maintain a desired angle state with respect to the mast member 104 by a telescopic gas pressure arm 106.
Both ends of the gas pressure arm 106 are connected to an intermediate portion of the boom member 105 and an intermediate portion of the mast member 104, respectively. The gas pressure arm 106 can adjust the expansion and contraction state by operating the operation lever 6a provided at one end of the gas pressure arm 106a via the operation wire 106b. That is, when the operation wire 106b is pulled, the gas pressure arm 106 becomes freely expandable and contractable, and in this state, the angle of the boom member 105 is adjusted as desired. Then, when the operation wire 106b is released in a desired state, the gas pressure arm 106 maintains the telescopic state at that time, and the angle of the boom member 105 is fixed and held.

At the base end of the boom member 105, a spring balancer 107, which is a balancer device, is provided. In this case, the spring balancer 107 operates by pulling out the spring and using a constant tension spring having a constant tension regardless of the amount of extension. The suspension wire 108 is connected to the spring of the spring balancer 107, and the connecting member 4 of the spot welding machine holding device 101 is connected to the tip of the suspension wire 108. Suspension wire 10
Reference numeral 8 changes the operation direction downward via a roller 109 provided at the tip of the boom member 105. Welding machine control unit 1
The supply of the welding current from the power supply 03 to the welding gun 102 is as follows.
The operation of the movable welding electrode and the supply of cooling air from the air controller of the welding machine control unit 103 to the welding gun 102 are performed via the air tube 111.

Next, the details of the welding gun 102 will be described with reference to FIG. The welding gun 102 includes a handle 102a, an electrode stand 10
2b, an arm member 102c, a fixed welding electrode 102d, a movable welding electrode 102e, a head portion 102f, and a switch portion 102g are additionally provided. Welding gun 10
The main body of the power supply transformer, a part of the power transformer,
For example, it is configured to be covered by a chassis member made of aluminum die cast or the like.

The handle 102a is a portion for an operator to grip when holding and operating the welding gun 102.
A switch unit 102g for performing operations such as operation of the movable electrode 102e and ON / OFF of a welding current is provided near the handle 102a. The electrode stand 102b protrudes from the main body of the welding gun 102, and the base end of the arm member 102c intersects with the tip (projecting end) of the electrode stand 102b so as to intersect. A fixed welding electrode 102d is protruded from the welding gun 102 so as to be folded back.

The head portion 102f is provided on the main body of the welding gun 102 so as to protrude substantially in the same direction as the electrode stand 102b, and has a movable welding electrode 102e at the tip. The movable welding electrode 102e is a fixed welding electrode 102d.
Are arranged on the same axis, and their tip portions are opposed to each other. The head portion 102f is connected to the movable electrode 10 by an air cylinder provided inside the main body of the welding gun 102.
2e is moved forward and backward.

The fixed welding electrode 102d and the movable welding electrode 102e are formed of a copper alloy having high thermal conductivity and high conductivity, for example, cadmium, chromium, titanium or beryllium. The electrode stand 102b and the head portion 102f in the main body of the welding gun 102 are arranged to be inclined at a predetermined inclination angle α, for example, as shown in FIG.
The head portion 102f is rotatably attached to the main body of the welding gamma 102 by a hinge (not shown), and rotates the movable welding electrode as necessary to make the facing distance between the head portion 102f and the fixed welding electrode. In addition, even when the edge of the member to be welded is bent, such as a flange portion, the joint of the member to be welded can be easily sandwiched between the welding electrodes.

Next, the manner of using the spot welding machine holding device 101 and the spot welding device incorporating the same, configured as described above, will be described. As shown in FIG. 3, the welding gun 102 held by the spot welding machine holding device 101 is adjusted to the required position and orientation of the welded part of the member to be welded and to the required height, and The welding operation is performed by operating the switch unit 102g while holding.

The state shown in FIGS. 3 and 4 is a state in which the electrode stand 102b is positioned above the movable welding electrode 102e in the figure, the electrode is oriented rightward, and is held at an appropriate height to perform the welding operation. is there. In this position, the mounting plate 1
Are located in front of the welding gun 102, and open downward in the figure between the fixed and movable electrodes. In this state, it is possible to easily perform a welding operation on a rising portion from below, for example, an engine room of an automobile body.

In this state, the spot welding machine holding device 1
The first and second arm members 2 and 3 of FIG. 01 are appropriately rotated to the state shown in the drawing, and the welding gun 102 is
It is suspended by the spring balancer 107 substantially near the center of gravity (see FIG. 3). Therefore, a part of the load of the welding gun 102 held via the spot welding machine holding device 101 is absorbed by the spring balancer 107 via the wire 108 and the roller 109.

FIG. 5 shows the welding gun 102 from the state of FIG.
Is rotated substantially 180 ° clockwise in the figure. This state is suitable for welding in which, for example, a portion protruding below the periphery of the automobile body, an upper central portion of the tire house, and the like are joined. FIG. 6 shows the state of FIG. 5 as viewed from the left in the figure, and clearly shows the arrangement of the electrode stand 102b and the head 102f.

FIG. 7 shows the welding gun 102 from the state of FIG.
6 shows a state in which the first and second connect arms 2 and 3 of the spot welding machine holding device 101 are drastically changed from the state of FIG. I understand. In this state, welding in the vicinity of the right lateral portion of the tire house can be easily performed. FIG.
4 shows a state in which the welding gun 102 is rotated approximately 90 ° clockwise from the state shown in FIG. In this state, for example, a portion protruding outward from a low portion such as the vicinity of a step portion of an automobile body can be easily welded.

FIG. 9 shows the state of the welding gun 102 from the state of FIG.
Is rotated substantially 180 ° clockwise in the figure. In this state, it is possible to easily weld, for example, a gutter portion on the periphery of the roof of the automobile body.

FIG. 10 shows the welding gun 10 from the state of FIG.
2 shows a state of being rotated approximately 45 ° counterclockwise in the figure. In this state, it is possible to easily perform a welding operation on a part that is very difficult to weld, such as a part near the right 45 ° of the tire body of the automobile body.

FIG. 11 shows the welding gun 1 from the state of FIG.
02 shows a state where it has been rotated approximately 90 ° counterclockwise in the figure. In this state, it is possible to easily perform a welding operation on a portion that is very difficult to weld, for example, from the left side to the upper center of the tire body of the automobile body. FIG.
Is a welding gun 102 viewed from the left side in the figure from the state of FIG.
Is rotated approximately 90 ° clockwise, and the welding electrode is directed forward. In this state, for example, as shown in the figure, the welding work on the most difficult part in the vicinity of the left side of the tire body of the automobile body can be easily performed.

As described above, in various postures of the welding gun 102, the connecting arms 2 and 3 are appropriately rotated so that the welding gun 102 is always kept almost in the vicinity of the center of gravity and in a state that does not hinder the work. 102 is suspended by the spring balancer 107 at the required height. When the direction / posture of the welding gun 102 is changed, the first and second connect arms 2 and 3 may suddenly rotate. Therefore, the gap between the mounting plate 1 and the first connect arm 2 is set to a size such that an operator does not pinch his hand between the welding gun 102 or the mounting plate 1. Similarly, the first connect arm 2
Of the predetermined range, particularly on the side where the welding electrode is located,
The rotation is restricted so that the work can be performed easily and stably, and the worker is not injured by the careless rotation.

In addition, the present invention can be embodied with various modifications within a range that does not change the gist thereof, such as reversing the rotation shaft and the bearing or employing a bearing other than the ball bearing. . For example, as shown in FIG. 8, the length of the second connect arm 3 is desirably the same as that of the first connect arm 2, but it may be longer or shorter than this. As shown in FIG. 9, a length adjusting member 3a such as a turnbuckle may be provided. In this case, it is desirable to provide the lock nut 3b so that the turnbuckle does not rotate carelessly.

[0067]

As described above, according to the present invention, the spot welding machine in a state where a predetermined gap is present on the back surface of the support base for fixing the front surface to the side surface of the spot welder and is fixed to the back surface of the support base. A first connecting arm is attached to the back surface of the support base so as to be rotatable in parallel with the back surface of the support base around an axis projecting perpendicularly to a position substantially corresponding to the vicinity of the center of gravity of the support base. In the vicinity of the rotation end portion, it is bent substantially at a right angle toward the support base front side,
While being formed to extend substantially parallel to the axis,
From the bent portion of the first connection arm on the rotation end side of the first connection arm, between the base end of the first connection arm and the center of gravity of the spot welding machine in a fixed state. Outside the portion corresponding to the distance, it is rotatable around an axis parallel to the base end of the first connection arm, and is smaller than the distance between the first connection arm and the bent portion. The second connecting arm is sufficiently long and connected to the wire of the balancer device at the tip of the second connecting arm. It is possible to provide a spot welding machine holding device that enables the machine to be suspended and supported by a balancer device at a position substantially near the center of gravity, thereby effectively reducing the burden on the operator.

According to the spot welding machine holding device of the second aspect of the present invention, the first connecting arm has a bearing portion supported by a rotating shaft vertically projecting from the back surface of the support base,
Since the bearing portion is fixed to the base end of the first connecting arm, the spot welding machine can be suspended and supported at a position near the center of gravity with a particularly simple structure by being coupled to the support base. It becomes possible. According to the spot welding machine holding device of the third aspect of the present invention, the first connecting arm moves the rotating shaft portion inserted into a bearing portion vertically projecting from the back surface of the support base. By connecting the base to the support base, the spot welding machine can be suspended and supported at a position near the center of gravity with a simple structure.

According to the spot welding machine holding device of the present invention, the second connecting arm is rotated by the bearing having an outer surface fixed to the rotating end of the first connecting arm. A shaft welding part is inserted, and the rotating shaft part is connected to the support base by a structure protruding laterally at the base end of the second connecting arm. The suspension can be supported at a position substantially near the center of gravity. According to the spot welding machine holding device of claim 5 of the present invention, the second connecting arm is pivotally supported on a rotating shaft protruding laterally from a rotating end of the first connecting arm. The spot welding machine is suspended and supported at a position near the center of gravity with a simple structure by connecting the bearing portion formed to the support base by fixing the bearing portion to the base end of the second connecting arm on the outer surface. Can be.

According to the spot welding machine holding apparatus of the sixth aspect of the present invention, since the structure further includes a stopper means for restricting a rotation range between the support base and the first connecting arm, the operator can particularly hand-operate. It is possible to safely reduce the burden on the worker without danger of being pinched. According to the spot welding machine holding device of claim 7 of the present invention, the stopper means includes a stopper pin projecting from the support base.
Particularly, the safety of the worker can be ensured with a simple configuration. According to the spot welding machine holding device of the eighth aspect of the present invention, the configuration is particularly simple because it further includes a hook member connected to the rotating end of the second connecting arm and connected to the wire of the balancer device. With such a configuration, the spot welding machine can be suspended and supported at a position substantially near the center of gravity.

According to the spot welding apparatus of the ninth aspect of the present invention, the spot welding machine main body in a state where there is a predetermined gap on the back surface of the support base for fixing the side surface of the spot welder main body and is fixed to the back surface of the support base. A first connecting arm is attached to the back surface of the support base so as to be rotatable in parallel with the back surface of the support base around an axis projecting perpendicularly to a position substantially corresponding to the vicinity of the center of gravity of the support base. In the vicinity of the rotation end, the support base is bent at a substantially right angle toward the front surface of the support base, and is formed so as to extend substantially parallel to the axis, and at the rotation end of the first connection arm, The first connection is formed outside a portion corresponding to a distance between a bent portion of the first connection arm and a center of the first connection arm and a center of gravity of the spot welding machine in a fixed state. The base of the arm and the flat As rotatable shaft of such axis,
Connecting the second connecting arm, which is sufficiently long compared to the distance between the first connecting arm and the bent portion, and
When the spot welding machine body is operated in any orientation and posture, the spot welding machine body is suspended and supported by the balancer device at a position near the center of gravity even when the spot welding machine body is operated in any orientation and posture. Thus, the burden on the operator can be effectively reduced.

According to the spot welding apparatus of the tenth aspect of the present invention, since the balancer apparatus includes a constant tension spring having a substantially constant winding tension regardless of the feeding amount, the spot welding machine main body can be set to an arbitrary height. And can improve the operability of the operator.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing a configuration of a spot welding machine holding device according to one embodiment of the present invention.

FIG. 2 is a right side view schematically showing the configuration of the spot welding machine holding device of FIG.

FIG. 3 is a diagram showing an overall configuration of a spot welding apparatus to which the spot welding machine holding device of FIG. 1 is applied.

FIG. 4 is a view showing a state of a main part in a use state of the spot welding apparatus of FIG. 1;

FIG. 5 is a view showing a state of a main part in a use state of the spot welding apparatus of FIG. 1;

FIG. 6 is a view showing a state of a main part in a use state of the spot welding apparatus of FIG. 1;

FIG. 7 is a diagram showing a state of a main part in a use state of the spot welding apparatus of FIG. 1;

FIG. 8 is a diagram showing a state of a main part in a use state of the spot welding apparatus of FIG. 1;

FIG. 9 is a view showing a state of a main part in a use state of the spot welding apparatus of FIG. 1;

FIG. 10 is a diagram showing a state of a main part in a use state of the spot welding apparatus of FIG. 1;

FIG. 11 is a diagram showing a state of a main part in a use state of the spot welding apparatus of FIG. 1;

FIG. 12 is a diagram showing a state of a main part in a use state of the spot welding apparatus of FIG. 1;

[Description of Signs] 1 Mounting plate 2, 3 Connect arm 4 Connecting member 5 Mounting screw 6 Washer 7, 8 Bearing holding bolt 11, 31 Rotating shaft 12 Stopper pin 12a Mounting hole 13 Bolt 21, 23 Bearing portion 22, 24 Ball Bearing 101 Spot welding machine holding device 102 Welding gun 102a Handle 102b Electrode stand 102c Arm member 102d Fixed welding electrode 102e Movable welding electrode 102f Head unit 102g Switch unit 103 Welder control unit 103a Wheel 104 Mast member 105 Boom member 106 Gas pressure arm 106a Operation lever 106b Operation wire 107 Spring balancer 108 Suspension wire 109 Roller 110 Connection bundle 111 Air tube

Claims (10)

(57) [Claims] 1. A support base for fixing a front surface to a side surface of a spot welder, and a predetermined gap is provided on a back surface of the support base and substantially corresponding to a vicinity of a center of gravity of the spot welder in a fixed state on the back side of the support base. To be rotatable in parallel to the back surface of the support base about an axis projecting perpendicularly to the position of the support base, and attached to the back surface of the support base, and bent substantially at right angles toward the front surface of the support base near a rotation end. A first connecting arm formed and extending substantially parallel to the axis; and a bent portion of the first connecting arm on a rotation end side of the first connecting arm. At a position corresponding to the distance between the base end of the spot welding machine in a fixed state and the center of gravity of the spot welding machine, the base being rotatably connected about an axis parallel to the base end of the first connection arm, First
A second connecting arm that is sufficiently long compared to a distance between the connecting arm and the bent portion, and can be connected to a wire of a balancer device at a distal end of the second connecting arm. A spot welding machine holding device characterized by comprising. 2. The first connecting arm comprises: a rotating shaft vertically projecting from a back side of the support base; and a pivot shaft supported by the rotating shaft. The spot welding machine holding device according to claim 1, wherein the holding device is coupled to the support base by a configuration including a fixed bearing portion. 3. The first connecting arm includes: a bearing portion vertically protruding from a back side of the support base; a first fitting arm inserted into the bearing portion; The spot welding machine holding device according to claim 1, wherein the holding device is coupled to the support base by a configuration including a protruding rotation shaft portion. 4. The second connecting arm includes: a bearing having an outer surface fixed to a rotating end of the first connecting arm; and a second fitting arm inserted into the bearing. The spot welding machine according to any one of claims 1 to 3, wherein the end is connected to the support base by a configuration including a rotation shaft portion protruding laterally. apparatus. 5. The second connecting arm includes: a rotating shaft protruding laterally from a rotating end of the first connecting arm; and a second shaft supported by the rotating shaft. The spot welding according to any one of claims 1 to 3, wherein the base is coupled to the support base by a configuration including a bearing portion having an outer surface fixed to a base end of the second connection arm. Machine holding device. 6. The spot welding machine according to claim 1, further comprising stopper means for limiting a rotation range of said first connecting arm with respect to said support base. Holding device. 7. The apparatus according to claim 6, wherein said stopper means includes a stopper pin projecting from said support base.
3. The spot welding machine holding device according to item 1. 8. The apparatus according to claim 1, further comprising a hook member connected to a pivotal end of said second connecting arm for connecting to a wire of said balancer device. Item 2. The spot welding machine holding device according to item 1. 9. A spot welding machine main body, a support base for fixing a front surface to a side surface of the spot welder main body, and a spot having a predetermined gap on a back surface of the support base and fixed to the back surface of the support base. The support body is rotatable about an axis perpendicular to a position substantially corresponding to the vicinity of the center of gravity of the machine body and parallel to the back of the support base, and is attached to the back of the support base. A first connecting arm that is bent substantially at right angles to the first connecting arm and extends substantially parallel to the axis; and a bent portion of the first connecting arm on the rotation end side of the first connecting arm. An axis parallel to the base end of the first connection arm, outside a portion corresponding to the distance between the base end of the first connection arm and the center of gravity of the spot welding machine body in a fixed state. Can rotate around A second connection arm that is sufficiently longer than a distance between the first connection arm and the bent portion, and is connected to a tip of the second connection arm via a wire. And a balancer device. 10. The spot welding apparatus according to claim 1, wherein the balancer device includes a constant tension spring having a substantially constant winding tension regardless of a feeding amount.