JPH07314145A - Spot welding device - Google Patents

Abstract

PURPOSE:To lessen an energization quantity and energization time by clamping the welding points of objects to be welded by means of conductors and electrodes for welding, bringing electrodes for switches into contact with the conductors and spot welding the welding points by energizing these electrodes. CONSTITUTION:The electrodes 20 for welding and the electrodes 21 for switches are respectively connected via cords 22, 23 to terminals 5a, 5b of a transformer connected to a power source 5 for welding. The power source 20 for welding is brought into pressurized contact with the intersected points P of longitudinal bars T1 and cross bars T2 in such a manner and the electrodes 21 for switches are pressed to the conductors 2. Simultaneously, electricity is supplied to the power source 5 for welding the electrodes 20 for welding the intersected points P of the longitudinal bars T1 and the cross bars T2 the conductors 2 the electrodes 21 for switches the power source 5 for welding, by which the intersected points P are spot welded and a reinforcing bar net is formed. At this time, the electrodes 20 for welding brought into pressurized contact with the intersected points P and the electrodes 21 for switches pressed to the conductors 2 are arranged in proximity and, therefore, a roasting voltage is made small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spot welding device.

[0002]

2. Description of the Related Art Conventionally, for example, there is a spot welding apparatus in which a plurality of reinforcing bars are arranged as a vertical bar and a horizontal bar in a grid pattern and spot welding is performed at the intersections of these bars to form a grid bar reinforcing bar unit.

In such a spot welding apparatus, a welding electrode connected to a welding power source is arranged immediately above the conductor, and the welding electrode is movable back and forth with respect to the conductor connected to the welding power source. Then, place the intersection point of the vertical stripe and the horizontal stripe on the conductor, contact the welding electrode at the intersection point, and perform spot welding by energizing and heating the intersection point. There is.

[0004]

However, in the above spot welding apparatus, the welding electrode → the intersection of the vertical and horizontal stripes → the current applied to the conductor flows from the end of the conductor to the welding power source. Since the energization time, the energization amount, and the so-called fog voltage at the time of energizing the conductor must be increased, the electricity cost becomes high, the welding cost becomes high, and the welding work time becomes long.

[0005]

In view of the above, according to the present invention, a conductor, a welding electrode that is arranged so as to be movable back and forth with respect to the conductor, and a welding electrode that are arranged close to the welding electrode are provided. It is equipped with a switch electrode arranged so as to be able to come in and out of contact with the electrode and a welding power source for supplying electricity to both electrodes. The switch electrode is brought into contact with the body, and the welding power source → welding electrode → welding target → conductor → switch electrode → welding power source is energized to enable spot welding at the welding point. The purpose is to provide a spot welding device.

Further, according to the present invention, the welding electrode presses the welding portion of the object to be welded with a pressure of 0.8 to 1 t / cm ² , and the welding electrode and the switch electrode are moved in the forward and backward directions with respect to the conductor. It is also characterized in that it can be moved integrally in a direction orthogonal to.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

A shown in FIG. 1 is a spot welding apparatus according to the present invention. The spot welding apparatus A is a support machine frame 1
In addition, the conductor 2 and the electrode portion 3 that moves back and forth with respect to the conductor 2.
And a moving part 4 for moving the electrode part 3, a welding power source 5 for supplying electricity to the electrode part 3, and a vertical stripe T1 as an object to be welded.
Is provided with a positioning portion 6 for positioning, and vertical bars T1 and horizontal bars T2 as the objects to be welded are arranged in a grid pattern.
The spot P (see FIG. 4) at the intersection point with is capable of spot welding.

As shown in FIG. 1, the support frame 1 includes a pair of left and right front columns 10 and 10 arranged at intervals in the left-right width direction.
And a pair of left and right rear columns 11,11 arranged immediately behind the front columns 10,10, and the upper ends of the front columns 10,10 and the rear columns 11,1.
The upper support frame 12 that is laid horizontally between the upper front end of 1 and the upper horizontal support frame 13 that is laid horizontally between the upper ends of the rear columns 11 and 11.
Lower lateral support frame that is laid horizontally between the lower parts of the rear columns 11 and 11.
14 and a rear intermediate support column 15 that supports the middle part of the lower horizontal support frame 14 and a pair of left and right upper and lower parts that are horizontally installed between the middle parts of the front and rear support columns 10, 10, 11, and 11. Side support frame 16,16,17,1
The framework consists of 7 and 7.

As shown in FIGS. 1 to 3, the conductor 2 is a strip of copper that extends in the lateral direction and is attached to the upper surface of the lower lateral support frame 14.

As shown in FIGS. 1 to 3, the electrode part 3 is composed of a welding electrode 20 and a switch electrode 21, and is attached to a moving part 4 which will be described later and to a welding power source 5 which will be described later. Connected via cords 22 and 23.

The moving part 4 is, as shown in FIGS. 1 and 2,
A guide rail 25 extending in the left-right width direction is laterally installed between the upper parts of the rear columns 11 and 11 of the support frame 1, and a pair of left and right electrode support members 26 and 26 are slidably attached to the guide rail 25. , Cylinders 27, 27 for pressurization and cylinders 28, 28 for advancing and retracting are attached to the electrode unit supports 26, 26 respectively, and each cylinder 27, 27, 28, 2
8 piston rods 27a, 27a, 28a, 28a can be moved up and down in the vertical direction.
While attaching the welding electrodes 20 and 20 to the lower ends of a and 27a,
The switch electrodes 21, 21 are attached to the lower ends of the piston rods 28a, 28a of the advancing / retreating cylinders 28, 28.

The electrode support 26 is shown in FIGS.
As shown in Fig. 5, a sliding motor 26b is attached to the support body 26a, and a sliding mechanism (not shown) is linked to the sliding motor 26b so that the support body 26a is guided along the guide rail 25. It can be moved to any position.

Further, as shown in FIG. 2, the pressurizing cylinder 27 and the advancing / retreating cylinder 28 are attached to the electrode portion supporting member 26 via a cylinder stay 29 so as to be close to each other in the lateral direction,
A constant gap (for example, 60 mm) can be maintained between the welding electrode 20 and the switch electrode 21 attached to each cylinder 27, 28.

Moreover, the pressurizing cylinder 27 is shown in FIGS.
As shown in, the piston rod 27a is moved up and down to move the welding electrode 20 attached to the lower end of the piston rod 27a to the intersection point P of the vertical stripe T1 and the horizontal stripe T2 placed on the conductor 2. In addition to being freely contactable and separable, it is possible to pressurize the intersection point P with a high pressure, for example, a pressure of 0.8 to 1 t / cm ² , and at the same time, to supply an alternating current of 80 to 100 A with a voltage of 200 to 220V. I have to.

On the other hand, in the forward / backward moving cylinder 28, as shown in FIGS. 2 to 4, the piston rod 28a is moved up and down to move the switch electrode 21 attached to the lower end of the piston rod 28a to the conductor 2. It can be attached to and detached from the upper surface of.

As shown in FIGS. 1 and 2, the welding power sources 5 are mounted on the left and right side portions of the upper support frame 12 of the supporting machine frame 1, respectively, and are connected to the power source as the welding power source 5. The two transformers are placed, and as shown in FIG. 3, the welding electrode 20 and the switch electrode 21 are connected to the terminals 5a and 5b of each transformer via cords 22 and 23, respectively. .

In this way, as shown in FIGS. 3 and 4, the welding electrode 20 is pressed against the intersection point P of the vertical stripe T1 and the horizontal stripe T2, and the switch electrode 21 is brought into contact with the conductor 2. At the same time, welding power source 5 → welding electrode 20 → intersection point P of vertical line T1 and horizontal line T2 → conductor 2 → switch electrode 21 → welding power source 5 is energized, or electricity is applied in the opposite direction to the above. hand,
By spot welding the intersection point P, the rebar mesh M
(See FIG. 8) can be formed.

At this time, a welding electrode is pressed against the intersection point P.
Since the 20 and the switch electrode 21 in contact with the conductor 2 are closely arranged, for example, with an interval of 60 mm, the so-called fog voltage can be reduced and the energization amount and energization time can be reduced. Can be reduced.

Moreover, the intersection point P is provided on the welding electrode 20.
For example, since pressing is performed with a high pressure of 0.8 to 1 t / cm ² , the reinforcing bar can be prevented from being oxidized and welding can be performed in a short time.

Further, the welding electrode 20 and the switch electrode
21 is supported by the electrode portion support 26, and the electrode portion support 26
Since it can be moved to an arbitrary position along the guide rail 25 in the left-right width direction, an arbitrary spot welding point, that is, an intersection point P in this embodiment can be welded quickly and reliably.

Therefore, in the spot welding apparatus A according to this embodiment, the welding cost and welding time can be greatly reduced.

As shown in FIGS. 1, 5 and 6, the positioning section 6 is provided between the upper support frames 16 and 16 of the support frame 1,
Four 1st, 2nd, 3rd and 4th positioning guide rails 30, 31, 32, 33 extending in the left-right width direction are laterally crossed at an interval in the front-rear direction, and the first front and rear Five longitudinal guides extending in the front-rear direction between the fourth positioning guide rails 30 and 33.
34, 34, 34, 34, 34 slide brackets 35, 35, 3 respectively
Across the 5,35,35 sideways slidably in the left-right width direction, and the intermediate second and third positioning guide rails 31,32
The five vertical guides 34, 34, 34, 34, 34 are also slid horizontally across the slide brackets 35, 35, 35, 35, 35, respectively, while supporting frame A positioning actuating body guide rail 36 extending in the left-right width direction is laterally provided between the lower support frames 17, 17 and a positioning actuating body 37 is mounted on the guide rail 36 in the left-right width direction along the guide rail 36. It is movable.

The longitudinal guide member 34 is shown in FIGS.
Longitudinal guide groove extending in the front-back direction as shown in
34a is formed, and claw fitting recesses 34b, 34b are formed in the central portions of the left and right side surfaces, respectively.

The positioning actuator 37 is shown in FIGS.
As shown in Fig. 4, the drive motor 37b is attached to the actuating body 37a, the slide drive mechanism (not shown) is linked to the drive motor 37b, and the drive motor 37b is rotated forward and backward to operate. The body 37a can be moved in the left-right width direction, and the actuator body 37a has a claw lifting cylinder 37c.
Install the piston rod 37 of the cylinder 37c
The piston rod 37d
By attaching a bifurcated fitting claw 37e that opens upward to the upper end of the piston and moving the piston rod 37d upward,
The fitting claw 37e is provided with a claw fitting concave portion 34b of the vertical line guide body 34,
It can be fitted to 34b from below.

In this way, the actuating body 37a is moved to a position directly below the vertical bar guide body 34, and at the same position, the piston rod 37d of the claw lifting cylinder 37c is lifted to move the vertical bar guide body 34. The fitting claw 37e is fitted into the claw fitting concave portion 34b, and in the same state, the actuating body 37a is moved to a preset vertical streak pitching position.

After that, the piston rod 37d of the claw lifting cylinder 37c is disengaged, and the same operation as described above is repeated to dispose each vertical line guide body 34 at a predetermined vertical line pitch position. I am able to do it.

At this time, the vertical line guide groove of each vertical line guide body 34
By inserting the vertical muscle T1 in advance in 34a,
The vertical stripes T1 can be arranged at a predetermined pitch via the vertical stripe guides 34.

Then, as shown in FIGS. 2 to 4, the conductors 2 are placed on the vertical stripes T1 arranged at a predetermined pitch as described above.
In the upper part, the transverse lines T2 are placed in an orthogonal state, and then spot welding is performed as described above.

The spot welding apparatus A according to this embodiment is also used.
7 is equipped with a control unit 40, and as shown in FIG. 7, the operation panel unit 41 is connected to the input side of the control unit 40, while the welding power source 5, the pressurizing cylinder 27, and the advancing / retreating cylinder 27 are connected to the output side. 28
By connecting the sliding motor 26b, the driving motor 37b, and the claw lifting cylinder 37c, sequence control from pitching of the vertical stripe T1 to spot welding can be performed.

In addition, the pitch of the vertical stripe T1 can be changed, and further, the spot welding position can be changed with the change of the pitch by the operation panel portion 41.

Spot welding apparatus A constructed as described above
As shown in FIG. 8, a vertical bar feeder B, a horizontal bar feeder C, and a reinforcing bar net carry-out device D are disposed in the vicinity of.

As shown in FIG. 8, the vertical streak supplying device B is provided with a vertical streak reservoir 50 and a vertical streak take-out arm part 51. Vertical T1
Of the vertical streak guides 34 provided in the positioning portion 6 of the spot welding apparatus A.
It is possible to insert one vertical muscle T1 in each. 52 is a vertical streak guide roller portion.

As shown in FIG. 9, the horizontal bar feeder C includes a horizontal bar storage section 53 and a horizontal bar take-out arm section 54. The horizontal bar take-out arm section 54 takes out the horizontal bar T2 from the horizontal bar storage section 53 one by one. On the vertical stripe T1 aligned on the conductor 2, the horizontal stripe T2
Can be placed in an orthogonal state.

As shown in FIGS. 8 and 10, the reinforcing bar net unloading device D comprises a horizontal bar adsorbing arm section 55 and a reinforcing bar net accommodating section 56, and the horizontal bar adsorbed to the vertical bar T1 by the horizontal bar adsorbing arm section 55. Adsorbing T2, pulling out the vertical bar T1 and the horizontal bar T2 to the reinforcing bar net accommodation section 56 side arranged immediately after each pitch of the horizontal bar T2, and repeating the work of sequentially spot welding the horizontal bar T2, the grid After the bar-shaped rebar net M is formed,
It is supposed to be accommodated in 56.

In this way, the reinforcing bar net forming work is fully automated, that is, as shown in FIGS. 8 to 10, the vertical bar T1 is supplied from the vertical bar feeder B to the positioning portion 6 of the spot welding machine A one by one. The same positioning unit 6 supplies a plurality of vertical stripes T1.
Are arranged at a constant pitch in the left-right width direction, the horizontal stripes T2 are placed in an orthogonal state on the vertical stripes T1 arranged on the conductor 2 by the horizontal stripe supply device C, and each intersection point P is spot welded. Device A
Spot welding is performed sequentially by the electrode part 3 of, and then the horizontal bar T2 is adsorbed by the reinforcing bar net carry-out device D and the horizontal bar T2 is
And the vertical stripe T1 are pulled out to the immediate rear by a constant pitch of the horizontal stripe T2, and the vertical stripe is positioned on the conductor 2 again from the horizontal stripe feeder C.
The transverse bars T2 are placed on T1 in an orthogonal state so that the intersection points P can be spot-welded one after another by the electrode part 3. This work is repeated a required number of times to form the reinforcing bar net M. The net M is housed in the rebar net housing portion 56 so that the work for forming the rebar net can be automatically performed.

The operation timing of each of the devices A, B, C, D is sequence controlled by the control unit 40.

[0038]

According to the present invention, the following effects can be obtained.

The conductor and the welding electrode pinch the welding point of the work piece to be welded, and the switch electrode is brought into contact with the conductor so that the welding power source → the welding electrode → the welding point of the work piece → conduction Since the body → switch electrode → welding power source is energized to enable spot welding at the welding point, the energization amount and energization time (so-called fog voltage) can be reduced.

Therefore, the welding cost and the welding work time can be significantly reduced.

The welding electrode is provided at the welding point of the object to be welded.
In order to press at a pressure of 0.8 to 1 t / cm ² , for example, when welding reinforcing bars as the objects to be welded, the reinforcing bars can be prevented from being oxidized and can be welded in a short time.

Therefore, also from this point, the welding cost and the welding work time can be greatly reduced.

Since the welding electrode and the switch electrode can be integrally moved in the direction orthogonal to the advancing / retreating direction with respect to the conductor, any spot welding point can be welded quickly and reliably.

Therefore, also from this point, the welding cost and the welding work time can be greatly reduced.

[Brief description of drawings]

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

FIG. 2 is a front view of the main part.

FIG. 3 is an explanatory diagram of the main part.

FIG. 4 is an explanatory plan view of the spot welding.

FIG. 5 is a perspective view of a positioning unit.

FIG. 6 is a front explanatory view of the positioning unit.

FIG. 7 is a control block diagram.

FIG. 8 is an explanatory plan view of an automated reinforcing bar net formation system.

FIG. 9 is an explanatory plan view of the automated reinforcing bar network forming system.

FIG. 10 is an explanatory plan view of the automated reinforcing bar net formation system.

[Explanation of symbols]

 A Spot welding device B Vertical bar feeder C Horizontal bar feeder D Reinforcing bar net carry-out device 1 Support machine frame 2 Conductor 3 Electrode part 4 Moving part 5 Welding power supply 6 Positioning part

Claims (3)

[Claims] 1. A conductor, a welding electrode which is arranged so as to move forward and backward with respect to the conductor, and is arranged in close proximity to the welding electrode, and is arranged so that it can come into contact with and separate from the conductor. Equipped with a switch electrode and a welding power supply for supplying electricity to both electrodes, the welding point of the object to be welded is clamped by the conductor and the welding electrode, and the switch electrode is brought into contact with the conductor. , Welding power source → Welding electrode → Welding object → Conductor → Switch electrode → Welding power source is energized to enable spot welding at the welding spot. 2. The welding electrode has a welding point of the object to be welded.
The spot welding apparatus according to claim 1, wherein the spot welding apparatus presses with a pressure of 8 to 1 t / cm ² . 3. The spot welding apparatus according to claim 1, wherein the welding electrode and the switch electrode are integrally movable in a direction orthogonal to the advancing / retreating direction with respect to the conductor.