JPS581990Y2 - Earthing device for electric welding - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a grounding device for electric welding used during electric welding, and is aimed at easily forming a ground for a welding base material.

A conventional grounding device for electric welding is composed of a large clip to which a ground wire is connected, and the large clip is engaged with one end of the welding base material to form a ground for the welding base material.

In this way, conventional grounding devices can only form a ground at the lower end of the welding base material, so as the welding base material becomes larger, the connection between the electrically welded location and the grounded location in the welded base material increases. Not only does the distance increase, which means a large amount of power is wasted, but
Sometimes the welding itself is not achieved properly.
It had the disadvantage of being

The present invention was devised to eliminate the drawbacks of the conventional examples described above, and uses the fact that the welding base material is a magnetic material to attach the ground electrode connected to the ground wire to the welding base using the magnetic attraction force. The earth electrode can be firmly fixed and held while electrically connected to the welding material, and the above-mentioned attraction force due to the magnetic force disappears due to the sliding displacement of the permanent magnet, which is the magnetic source, so that the earth electrode can be easily separated from the welding base material. It is composed of

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

The grounding device for electric welding according to the present invention includes a guide member 1 made of a non-magnetic material that is formed into a vertically long gate shape and has a handle portion 4 on its upper side.
And between the lower ends of both legs, which are both the left and right sides of this guide member 1,
A pair of adsorption members 3, 3' made of a soft magnetic material are installed and fixed in facing positions front and back with a constant interval, and an electrically insulating material and a non-conductive material is placed between the lower ends of the pair of adsorption members 3, 3'. Through a ground electromagnetic support member 5 made of a material that is also a magnetic material, it can be moved up and down in an upright position with its lower end protruding below the lower end surfaces of the adsorption members 3 and 3', and always directed downward. The earth electrode 9 is held assembled while receiving the elastic force from the spring 7, and the pair of suction members 3 are guided by both legs of the guide member 1.
A permanent magnet 12 is assembled to be slidable in and out between the magnets 3' and 3', and the surface facing the adsorption member 3' is a magnetic pole face, and a low-height gate fixed to the upper end of the permanent magnet 12. It is composed of a mold-shaped operating handle 13.

The guide member 1 holds the pair of attracting members 3, 3' facing each other at regular intervals, and slides the permanent magnet 12 in and out between the pair of attracting members 3, 3'. Since it is assembled and held so that it can move freely,
In order to achieve smooth sliding of the permanent magnet 12 in the vertical direction, vertical grooves for guiding are formed on the opposing inner surfaces of both legs of the guide member 1, as in the illustrated embodiment. It is preferable that both ends of the permanent magnet 12 fit loosely in the groove.

A pair of suction members 3 fixed between the lower end portions of the guide member 1,
3' is a part that forms an adsorption surface for the surface of the welding base material 14 of the device of the present invention, and therefore, the lower end surfaces of both adsorption members 3 and 3' are flat surfaces located on the same flat surface. is good.

The earth electrode 9 assembled between the lower ends of the pair of suction members 3, 3' via the earth electrode support member 5 for vertical displacement is naturally connected to a ground wire (not shown). However, in the case of the illustrated embodiment, a stepped portion 8 is provided around the flat end of the ground electrode 9, and the pull-out plate 10 is not pulled out from the ground electrode 9 while being locked to the stepped portion 8. A ground terminal 11 to which a ground wire is connected is provided at the end of the pull-out plate 10 extending from between the adsorption members 3 and 3', thereby establishing a connection between the ground electrode 9 and the ground wire. It looks like this.

In the illustrated embodiment, the ground electrode support member 5, which holds the twisted earth electrode 9 assembled between the pair of suction members 3°3', extends the drawer plate 10 from between the two suction members 3°3'. It has the shape of a hollow rectangular box with one side open so that the earth electrode 9 can be inserted vertically through it.

A spring T that exerts a downward elastic force on the earth electrode 9 that is assembled and held in the earth electrode support member 5 is positioned within the earth electrode support member 5 while being fitted onto the earth electrode 9. The upper end is brought into elastic contact with the top wall of the earth electrode support member 5, and the lower end is brought into elastic contact with a drawer plate 10 which is fixed to the earth electrode 9 in such a manner that it cannot be removed.

Note that the earth electrode 9 protruding on the earth electrode support member 5
The stopper 6 integrally provided in the shape of a flange at the upper end is used when the drawer plate 10 is not fixed to the earth electrode 9.
This is to prevent the earth electrode '9 from falling downward from the earth electrode support member 5 due to its own weight.

Generally, the ground electrode 9 has its lower end in contact with the welding base material 14 to electrically connect the welding base material 14 to the ground wire, so the contact resistance between the welding base material 14 and the earth electrode 9 is reduced. should be as small as possible, and for this reason, it is preferable that the lower end surface of the ground electrode 9 be the same flat surface as the surface of the welding base material 14.

A permanent magnet 12 is slidably attached to the guide member 1 so that it can move in and out between the pair of adsorption members 3 and 3', and its magnetic force is more effectively applied to both the adsorption members 3, 3' and the welding base material. 14
Both adsorption members 3, 3'
Since it is desirable that the gap formed between the magnetic pole surface and the opposing surfaces of the attracting members 3 and 3' be as small and uniform as possible when the permanent magnet 12 is inserted into the magnet, the shape of the permanent magnet 12 is as follows. It is preferable to have a thick flat plate shape as in the illustrated embodiment.

This twisted permanent magnet 12 is used as the welding base material 14 of the device of the present invention.
In order to ensure that the suction and detachment operations for the
As shown in FIG. 4, when the adsorption members 3 and 3' are completely separated from each other and are displaced downward, the entire magnetic pole surface is completely attached to the opposing surface of the adsorption members 3 and 3', as shown in FIG. The height of the permanent magnet 12 and the height of the combination with the operating handle 13 are set so that the permanent magnet 12 and the operating handle 13 are positioned facing each other.

Incidentally, auxiliary members 2 and 2' made of non-magnetic material are fixed on the upper end surfaces of both the adsorption members 3 and 3' in a form that covers the upwardly displaced permanent magnet 12 from the front and back. ,2
' is used to guide the permanent magnet 12 in order to make the vertical displacement of the permanent magnet 12 more stable, and to prevent other objects from colliding with the permanent magnet 12, which has mechanically fragile properties. .

Since the present invention has the above-described configuration, the device of the present invention, which has a ground wire connected to the ground terminal 11, is carried by the handle 4 near the welding point of the welding base material 14 and placed.

At this time, the permanent magnet 12 is moved by both adsorption members 3 and 3' due to its own weight.
Since they are located in between, a strong magnetic attraction force is generated on the lower end surfaces of both adsorption members 3 and 3', and this magnetic attraction force causes the adsorption members 3 and 3' to adsorb onto the welding base material 14. However, due to the elasticity of the spring 7, the lower end of the ground electrode 9, which protrudes below the lower ends of the suction members 3 and 3', hits the welding base material 14, and in this state, the suction member 3 The magnetic attraction force generated between .3' and the welding base material 14 is due to the large distance between the adsorption members 3, 3' and the welding base material 14, that is, the amount of downward protrusion of the ground electrode 9. Unable to overcome the elasticity of spring 1, the suction member 3
, 3' and the welding base material 14 cannot be attracted to each other.

From this state, a downward force is applied to the handle portion 4 to press the device of the present invention onto the welding base material 14 against the elasticity of the spring γ, thereby bringing the mating members 3, 3' into contact with the welding base material 14. As a result, the magnetic attraction force acting between the adsorption members 3, 3' and the welding base material 14 becomes much stronger than the elasticity of the spring 7.
The device of the present invention is held by suction to the welding base material 14 in the attitude shown in FIG. 5.

In the state shown in FIG. 5, the ground electrode 9 is pressed against the welding base material 14 by the elasticity of the spring 10, so the electrical connection between the grounding electrode 9 and the welding base material 14 is maintained in an extremely good condition. will be done.

From the assembled state shown in FIG. 5, the combination of the operating handle 13 and the permanent magnet 12 is moved upward by placing the finger of the hand extending over the handle portion 4 over the operating handle 13, as shown in FIG. 4. ,
When the permanent magnet 12 is removed from between the two attracting members 3, 3', the magnetic attraction force acting between the attracting members 3, 3' and the welding base material 14 disappears, and the elasticity of the spring 7 causes the earth electrode to close. 9 protrudes downward.

In other words, the elasticity of the spring 7 pushes up the parts other than the ground electrode 9, thereby making it possible to separate the device of the present invention from the welding base material 14.

Note that when the permanent magnet 12 is removed from between the two adsorption members 3, 3', a magnetic attraction force is naturally generated between the adsorption member 3.3' and the permanent magnet 12 to prevent this separation. However, since the permanent magnet 12 moves in a direction parallel to its magnetic pole surface, the magnetic attraction force acting between the permanent magnet 12 and the attraction members 3, 3' is extremely weak, and the permanent magnet 12 moves in a direction parallel to its magnetic pole surface. There is no possibility that it will be impossible to achieve upward movement of the magnet 12.

As is clear from the above description, the present invention allows the connection and disconnection of the ground wire to the welding base material to be achieved extremely easily and reliably, and also allows the connection point of the ground wire to the welding base material to be freely set. This can significantly reduce the power consumed within the welding base material, resulting in more efficient electric welding, and the ground electrode has a strong Since the electrical connection is made while being pressed against the welding surface, contact resistance can be reduced, and power efficiency during welding can be further improved, among other excellent effects.

[Brief explanation of the drawing]

1 and 2 are a front view and a side view of an embodiment of the present invention, FIGS. 3 and 4 are a front longitudinal sectional view and a side longitudinal sectional view of an embodiment of the invention, and FIG. FIG. 3 is a side vertical cross-sectional view at the time of suction. 1... Guide member, 3 and 3/... Adsorption member, 5... Earth electrode support member, 7...
・・・Spring, 8...Step part, 9...
Earth electrode, 10...Drawer plate, 12...
...Permanent magnet, 13... Operating handle, 14...
...Welding base material.

Claims (1)

[Scope of utility model registration request] A guide member made of a non-magnetic material that is formed into a gate shape and has a handle on its upper side, and a pair of suction members made of a soft magnetic material that are fixed at a constant interval between the lower ends of both legs of the guide member so as to face each other from front to back. A ground electrode support member made of an insulating and non-magnetic material is interposed between the lower end portions of the pair of adsorption members, and the lower end is raised and lowered with the lower end protruding below the lower end surface of the adsorption member. A ground electrode that is movable and always held downward by the elasticity of a spring, and a ground electrode that is slidably moved in and out between the pair of adsorption members guided by both legs of the guide member. 1. A grounding device for electric welding, which comprises a permanent magnet with a magnetic pole surface facing the attraction member, and a low-height gate-shaped operating handle fixed to the upper end of the permanent magnet.