JP4992142B2 - Earth electrode tip holder for welding - Google Patents

Description

  The present invention pulls out a recessed portion that is unexpectedly generated due to a contact accident or the like to an exterior body of an automobile, an agricultural machine, a construction machine, an electrical appliance, or the like in a direction to return to the original shape (original shape) when repairing the sheet metal. The present invention belongs to a technical field related to attachment of a welding ground electrode tip holder that serves as a ground when performing electric welding for welding a puller such as a puller electrode tip.

  Roughly categorizing repairs of automobile bodies that have deformed exterior parts due to contact accidents, etc., relatively large repairs to replace exterior parts, and dents that occurred in parts of outer panels such as fenders, bonnets, and doors It is divided into small repairs that correct the recesses. To correct this small indentation, pull out the indentation close to the original state, then apply a putty, polish the surface irregularities to the original state and polish with a grindstone (paper) and finally finish painting In many cases, repairs are completed.

  As a method for pulling out the recessed portion as much as possible, the puller electrode tip is welded to the recess, and the puller electrode tip is pulled out to draw out the welded portion to the place close to the original state while the recess is welded. It will be removed and put in the recesses, and will be painted and repaired.

  In order to weld this puller electrode tip to the concave portion, it is necessary to generate a welding heat that causes a positive current from the positive electrode of the electric welding machine to flow through the puller electrode tip and to be electrodeposited with the concave portion. In order to generate welding heat, it is necessary to have a circuit configuration in which a welding current flowing in the concave portion is passed through the ground electrode of the electric welding machine.

  For this reason, in order to energize the welder ground electrode in the recess, the ground electrode tip is pressed against the welded surface of the body where the painted surface near the recess is peeled, and the ground electrode tip and the ground electrode of the electric welder are connected to the ground wire. By connecting with each other, it is possible to configure a current circuit in which the welding current generates welding heat between the puller electrode tip and the recess.

In order to solve such a technical background, for example, technical means shown in the following patent documents are employed.
JP 2001-353580 A JP, 2005-324232, A JP, 2005-324232, A illustrates patent document 2 as a reference of one means of correcting plating using a puller electrode.

  As a trend in recent years, the outer panels of automobile fenders, bonnets, doors, etc. that are being repaired have subtle curves from the viewpoint of design and strength, and the material is also lighter in weight.部 材 We are moving to lighter aluminum or resin, and more and more members are not affected by magnetism.

  The electrode tip holder for welding shown in Patent Document 1 is of a type generally adopted in the automobile repair industry, and is mounted on the outer plate of an automobile fender, bonnet, door, etc. by utilizing a magnetized magnetic function. As a result, the earth electrode can be attached to and detached from the automobile repair part relatively easily and in a short time, and has been well received.

  However, there are many operations to grind iron sheets at sheet metal repair shops, and because there is a lot of iron powder scattered in the factory, iron powder adheres to the magnet of the electrode tip holder for welding, and iron powder If a magnet is magnetized on the body of an automobile while it is attached, the painted surface of the automobile may be damaged. Further, in order to remove the adhering iron powder from the magnet, it is necessary to extract the magnetic force of the magnet, and thus a demagnetizing device is required, which is inevitably used for rough removal to the extent that it is manually removed. In Patent Document 1, in order to remove the adhesion of iron powder from the magnet of the electrode tip holder for welding, a coating layer made of a non-magnetic material is used. However, the distance between the magnetized surface of the magnet and the body iron plate to be magnetized is too long. Since the magnetizing force decreases, it is necessary to increase the magnetic force of the magnet. Also, it is troublesome to remove the coating layer from the magnet and clean the attached iron powder, and even if the coating layer is attached, the magnetic force passes through the coating layer and the iron powder is easily adsorbed, so the coating surface damage is solved. There is no situation.

In addition, the magnet for magnetizing the car body has a magnetized surface that is machined into a flat surface and does not match the curve of the car body of the car. Wearing power is significantly reduced. For this reason, in order to enlarge a magnet, the weight was heavy and it induced the faults, such as becoming large. In addition, the magnetized part to which the electrode tip for grounding is attached needs to be a flat part and made of a magnetic material that can be magnetized. However, recent automobiles have been reduced in weight for the purpose of improving fuel efficiency. The transition from heavy iron plates to lighter aluminum-based materials is also becoming more conspicuous, and non-magnetic materials such as these aluminum-based materials and resin materials are used by magnets. Since magnetic attachment may not be possible, it is becoming impossible to work with a conventional earth electrode tip holder using a magnet.

  In addition, the end surface of the wing nut used in the earth electrode tip portion has a contact area that is reduced due to the inclination of the contact with the surface to be welded, so the wing nut must be attached perpendicularly to the surface to be welded. In the structure illustrated in FIG. 1, it is possible if the repair portion is flat, but the wing nut cannot be adjusted vertically in the curved portion.

  Furthermore, the welded surface body contact portion at the tip of the electrode tip is inherently energized with a large welding current, causing melting damage, and it is necessary to increase the contact surface pressing and energizing area. In this structure, the magnetized part and the electrode tip part are connected by a metal plate that acts as a spring, and if the car body is not flat but curved, the tip of the electrode chip can be attached in a state perpendicular to the car body. Rather, contact with tilt is common. During welding, an excessive welding current flows through the contact surface of the earth electrode tip, so the contact portion may be melted by the energizing current. To prevent this, the contact surface pressure between the earth electrode tip and the surface to be welded is reduced. Although strengthening, the metal plate and the flat magnet with the magnetized surface protected by the coating layer as in Patent Document 1 cannot prevent the erosion because a pressing load sufficient to prevent the erosion is not obtained due to the weak magnetizing force. The current situation is less effective.

  Welding requires an excessive current, so that the plus and ground wires of electric welders are generally thick and difficult to bend. For this reason, when connecting an earth wire to the earth electrode tip, it is common to connect with a bolt or nut, but when the ground wire is bent, twisted or distorted, it is transmitted to the magnetized part of the earth electrode tip, and the condition is bad. The magnetized part may come off from the body, and in order to prevent these obstacles, it was necessary to magnetize after unwinding and twisting the long ground wire in advance.

With respect to a welding circuit that contributes to solving the problems of the present invention, the relationship among the electric welding machine 1, the puller electrode tip 2, and the ground electrode tip 10 relating to welding will be schematically described with reference to FIG. When repairing by pulling out the recessed portion (recessed recess) 3 of the automobile body 6 in the direction to restore the original shape, the puller electrode tip 2 is welded to the recess 3 and the puller electrode tip 2 is pulled out for correction (references). 2). In order to weld the puller electrode tip 2, the plus wire 4 from the electric welder 1 is connected to the puller electrode tip 2, and the ground wire 51 from the electric welder 1 is connected to the ground wire connection part 50. The welding current flows from the electric welder 1 through the puller electrode tip 2, flows into the body 6, and flows from the ground electrode tip 10 to the electric welder 1 through the conductor 11 and the ground wire 51. Electric welding can be performed only after the setup.
The present invention is a part of the circuit relating to the ground electrode tip.

  In order to solve the above-mentioned problems, the present invention is firstly arranged in a suction device in which a soft member is brought into close contact with the surface of an object to be welded, and a holder portion integrally provided in the suction device. And a conductor with a ground electrode tip fixed and held in a freely slidable and reciprocating manner, and adjusting the position of the conductor with respect to the holder portion so that the tip side of the ground electrode tip is the surface of the work piece A soft product that is structured so that the portion (adsorption device) for adsorbing and holding the earth electrode tip on the work piece is integrated with the male screw attached to the holder portion (holding body). A conical suction cup formed of a resin material is used, and a soft member can be elastically contacted and sucked regardless of the material of the welded part.

  Secondly, the suction device that is in close contact with the workpiece to be welded is constituted by a suction cup, and a function of forcibly increasing the suction force of the suction cup is provided by providing a pressing means for forcibly pressing the suction cup against the surface to be welded. The suction cup part is provided with a plate for pressing the suction surface of the suction cup to forcibly lift the upper part of the suction cup, and the suction cup is lifted by tightening the female screw screwed into the male screw. The volume of the space A composed of the inner surface and the welded surface is increased, the negative pressure is increased, and the suction force is increased.

  Thirdly, to connect the ground wire from the welding machine to the base end side, and to attach the conductor with the ground electrode tip attached to the tip, the holder part fixedly held by the adsorption device is a block-like holder And a structure in which an electric conductor can be attached with attachments A and B that are fixed to the holding body so as to be displaceable. The holding body is fixed to the male screw of the suction cup, and the tip of the holding body has a tip. A rigid bar-shaped conductor bent in an L shape is structured to be mounted at a position where it can be displaced by mounting tools A and B and a knob.

  Fourth, the conductors attached by the attachments A and B that are fixed to the holding body so as to be displaceable are formed into a round bar shape with a circular cross section. That is, the rigid bar-shaped conductor whose tip is bent in an L-shape sets the ground electrode tip in an optimum state, and therefore, it is necessary to change the relative position so that it can be mutated. For this reason, the cross section is formed in a circular shape, inserted into the mounting holes of the fixtures A and B, displaced up and down, rotated around the axis, and slid forward and backward, and set to the desired posture by tightening the knob. The structure can be fixed.

  Fifth, in the top view, the ground electrode tip and the suction device are provided on the center line of the conductor, and the conductor is formed in a straight line so that the conductor can be lifted with a jack if necessary. The structure can surely increase the contact pressure of the ground electrode tip.

  Sixth, the conductor ground wire connection part is structured so that the earth wire from the electric welding machine can be rotated in the circumferential direction and can be joined and fixed in the axial direction, and when the connection part is burned by an energizing current By having an earth wire connecting part that can be easily replaced, the earth wire connecting part for connecting the earth wire of the electric welding machine is attached to a cylinder that can be rotated by a shaft attached to the conductor. The ground wire is fixed to the screwed clasp with bolts and nuts. Although this ground connection portion has been described as an example of being attached to an electric conductor, the same effect can be exhibited even if it is attached to the middle of the ground wire or to the earth electrode portion of an electric welding machine.

  Seventh, the fitting with the female screw of the adjustable fitting attached to the screw of the screw rod of the earth electrode tip portion is made into a flexible backlash configuration, and the fitting is inclined to the surface to be welded. It is structured so that it can be contacted evenly, and the fitting of the adjustable fitting mounted on the screw rod of the earth electrode tip part and the female screw has a flexible backlash configuration, and the screw of the fitting The contact part is provided so as to be shifted to the contact surface side, and the opposite side of the contact surface is configured as a contact tool having a large gap with the male screw, so that the contact tool can be inclined by an angle α with respect to the axis of the screw rod. It has a structure that can be done.

    Eighth, to set the length of the conductor, the height from the suction surface of the suction device to the conductor is set so that a jack for pressing and contacting the ground electrode tip to the surface to be welded can be easily attached. By securing the length of the conductor so that the jack can be installed from the suction position at a distance approximately equal to the distance from the suction position to the ground electrode tip, the welded surface is thin iron plate or aluminum If it is easy to melt, the contact surface between the ground electrode tip and the work piece is prevented from being melted by the welding current, so it is prevented by applying a pressing load to the contact surface. The height from the position to the conductor is such that the jack can be attached, and the distance from the suction device position to the ground electrode tip is approximately the same as the distance from the suction device position of the suction cup to the ground electrode tip. Key has a structure in which the length of the conductor can be attached is ensured.

According to the first aspect of the present invention, since it is adsorbed by the negative pressure suction force of the suction cup formed of a soft resin material, compared with the conventional magnetic attachment by the magnet, there is no magnetic force, and iron powder or the like is attached. Cleaning is easy, and even if the suction surface is a slightly deformed curved surface, the suction force does not decrease because the soft suction cup follows the curved surface. Also, because suction is performed by negative pressure instead of magnets, suction is possible on any material as long as the surface is smooth, and it is the best suction method for suctioning a smooth painted surface such as the exterior of an automobile. It can be said.
Also, the adsorption device is provided integrally with the holder part, and the conductor with the earth electrode tip is fixed and held in this holder part so that it can be swung up and down in a seesaw state and slid forward and backward in the front-rear direction. Thus, it is possible to reliably bring the tip end side of the ground electrode tip by the conductor into contact with the surface of the workpiece.

  According to the invention of claim 2, since the negative pressure of the suction cup described above can be increased, the suction force can be increased in proportion to the increase of the negative pressure, and the suction force is light and small. It is possible to provide a ground electrode tip holder having the same.

  According to the invention of claim 3, it is said that the surface to be welded of the ground electrode tip through which an excessive welding current flows has a large contact area and a high contact surface pressure is a method for preventing melting damage. For this reason, in the present invention, since the conductor integrally formed with the ground electrode tip can be displaced and fixed to the holding body, the ground electrode tip is perpendicular to the surface to be welded on any curved surface. It will be attached. In addition, since the fitting of the screw of the earth electrode tip fitting of the invention according to claim 7 has a flexible backlash structure with a large gap, even if the screw rod is attached to be slightly inclined, The end face can be brought into full contact with the non-welded surface, and an appropriate contact posture is ensured, so that a melting damage accident can be prevented.

  According to the fourth aspect of the present invention, the above-mentioned ground electrode tip can be fixed in a displaceable manner. This is because the conductors of the fixtures A and B for fixing and holding the conductor on the holding body, and the fixtures. Since the mounting parts of A and B have a circular cross section, it is possible to turn, rotate and slide freely. The ground electrode tip can be used as the welded surface regardless of the curved surface of the automobile body. It provides a structure that can be set in a desired posture and attached vertically.

  According to the invention of claim 6, in general, the plus wire from the electric welding machine is composed of a soft wire because the degree of movement is large for welding, but the ground wire has a small degree of movement and the thickness of the wire is thick. hard. Since the ground wire moves to each work place each time, the wire is twisted and bent, and when the ground wire is connected, there is a mounting hole to fix it with bolts, etc., but the ground wire mounting part is a light member The attachment member may be twisted and rotated by twisting of the ground wire. The fixing force in the case of the earth electrode tip is the magnetic adhesion force or the attractive force of the present invention and is not strong, and the magnetized part or the adsorbing part may come off. Since the clasp that stops the rotation can rotate freely, even if the ground wire is twisted, the clasp rotates, the rotational force is released, and the force that twists the adsorption part is not transmitted. Can be prevented.

  According to the eighth aspect of the present invention, since a large welding current flows through the contact portion of the ground electrode tip with the surface to be welded and may cause melting damage, the area of the contact portion is increased and the pressing of the contact surface is increased. It is a precautionary measure. In the present invention, a jack mounting space of the height of the holding body and the length of the conductive rod is provided so that a jack for lifting the conductor can be installed on the side opposite to the ground electrode tip portion from the suction portion of the suction cup as necessary. Therefore, by using a jack and lifting the electric conductor on the jack side, the ground electrode tip portion can be pushed down via the suction portion by the lever principle, and melting damage of this portion can be prevented. This jack does not need to be used when there is no concern about melting damage such as a thick steel plate, and is used by setting it as an attachment, and is not set when it is not necessary.

  FIG. 1 is a schematic diagram for explaining the operation of the recess repairing operation, FIG. 2 is a plan view of the whole embodiment of the welding ground electrode tip holder of the present invention, and FIG. 3 is a side view of FIG. In FIG. 3, the rigid round bar-shaped conductor 11 made of a conductive metal material movably attached to the holding body 28 of the adsorption unit 20-1 has a distal end bent to an L-shaped end. The ground electrode tip 10 is attached, and the ground wire connecting portion 50 is provided on the other base end side. The ground electrode tip 10 is provided with a distance L1 at which the conductor 11 can be easily adjusted to be displaceable so that the entire surface of the contact surface 15 of the contact tool 12 contacts the surface to be welded 18 evenly. A jack 40 may be used as necessary, and the length of the conductor 11 is provided in the jack 40 so that the distance L2 can be approximately the same as the distance L1. Further, as shown in FIG. 2, the center S of the suction cup device 20-1 and the axis of the conductor 11 are installed on the same line on the line connecting the center R of the earth electrode tip 10 and the center T of the jack 40.

FIG. 4 is a detailed sectional view of the earth electrode tip portion 10. A bolt-shaped screw rod 13 is fitted and connected to the tip of the electric conductor 11 bent in an L shape, and is fixed by a set female screw 14. A nut-shaped fitting 12 is joined to the screw rod 13 with a female screw 16, and the fitting of the screw is made larger than a normal gap, so that a flexible backlash configuration is provided. A female screw is provided on the contact surface 15 side of the contact tool 12, and a large gap 17 is provided on the opposite side from the screw rod 13. Further, the screw rod 13 has a structure that can be detached from the conductor 11 by loosening the set screw 14, and can be easily replaced when the screw rod 13 is worn or damaged.

FIG. 5 is a view in the case where the screw rod 13 does not attach to the welded surface 18 perpendicularly.
If the screw rod 13 is not attached perpendicularly to the surface to be welded, the contact surface 15 of the contact tool 12 is welded along the screw rod 13 when there is no screw fitting clearance between the screw rod 13 and the contact tool 12. The contact tool 12 comes into contact with the surface, but since there is a gap in the configuration where the screw is fitted, the contact tool 12 is separated from the axis of the screw rod 13 so that the contact surface 15 is along the welded surface 18. The contact surface 15 comes into full contact along the surface to be welded 18.

  FIG. 6 is a detailed view of the adsorption device 20-1 and the holder portion 20-2 of the cross section AA of FIG. The suction cup 23 is made of a soft resin material that is flexible and does not conduct electricity so as to be deformable, and is formed into a conical shape, and is integrally formed with a bolt-shaped male screw 27. A nut-shaped female screw 26 is screwed into the male screw 27, and an umbrella-shaped rigid plate 24 made of metal is provided between the suction cup 23 and the female screw 27. A space portion A22 is provided between the suction cup 23 and the suction surface 21, and a space portion B25 is provided between the plate 24 and the suction cup 23. Further, the outer diameter of the suction cup 23 is set to be slightly larger than the outer diameter of the plate 24.

  When the female screw 26 fitted to the male screw 27 is rotated and lowered to the suction surface 21 side, the plate 24 comes into contact with the outer peripheral portion of the suction cup 23 and stops descending, and then the upper side of the suction cup 23 is lifted. . When the suction cup 23 is lifted, the suction cup 23 is deformed so as to expand the space A22. When the volume of the space part A22 increases, the pressure inside the space part A22 decreases, the negative pressure increases, and the suction force increases in proportion to the pressure difference from the outside air, obtaining a strong suction force and adsorbing. The suction cup 23 is firmly adsorbed to the surface 21.

  As described above, since the negative pressure generated by the pressure difference with the outside air is used as the suction force, regardless of the material of the suction surface 21, how can the confidentiality between the suction cup 23 and the suction surface 21 be secured? It can be adsorbed to anything.

  In the case of the present invention, the suction cup 23 is made of a soft resin material that is flexible and non-conductive as described above. Therefore, since the current during welding does not flow to the suction surface 21, there is no damage to the painted surface of the suction surface.

  A holding body 28 serving as a rectangular holder portion 20-2 formed of a hard resin material is fitted on the upper portion of the male screw 27 with a screw and fixed with a nut 29. The holding body 28 is provided with a mounting tool A31 in the form of a round shaft and a mounting tool B32 in the form of a round tube, and the round bar-shaped conductor 11 has holes formed in the mounting tool A31, the mounting tool B32, and the holding body 28, respectively. The conductor 11 is mounted so as to be rotatable and slidable. A screw 37 is fitted with the knob 30 to the attachment A31. When the knob 30 is closed, the play of the hole formed in each member disappears and the conductor 11 is fastened and fixed. The conductor 11 can be freely displaced by the looseness of the formed hole.

  7 is a detailed view of section BB in FIG. The conductor 11 is attached through the holes drilled in each of the fixture A31, the fixture B32, and the holding body 28, and each hole has a gap through which the conductor 11 can freely rotate and slide. have. When the knob 30 is screwed, the fitting A31 is moved to the knob side, and the fitting B32 is moved to the knob 30 side via the conductor 11. However, the attachment B32 cannot move because the collar 36 stops at the groove portion 35 of the holding body 28. When the knob 30 is further screwed, the attachment A31 moves the conductor 11 to the knob 30 side, but the attachment B32 does not move. Therefore, the conductor 11 penetrating through the hole of the attachment B32 cannot be moved. Is fixed to the holding body 28. The conductor 11 has a circular cross section and is inserted into the attachment holes of the attachments A and B. The conductor 11 is displaceable so that it can be swiveled up and down in a seesaw shape, can be rotated around its axis, and can be slid forward and backward. It has a structure that can be set and fixed in a desired posture by tightening the knob 30.

FIG. 8 is a detailed sectional view of the jack 40. A screw 42 is provided at the center of a base 41 formed of a slightly soft resin material so as not to damage the painted surface, and a knob 43 is screwed. The receiver 44 is joined to the knob 43 by a ring 45 so as to be rotatable and cannot be separated. A V-groove 48 is provided at the tip of the receiver 44 so as to hold the round shaft portion of the conductive rod 11.
1, 2, and 3, the jack 40 is set so that the V-groove 48 is positioned below the round shaft portion of the conductive rod 11, and the knob 43 is artificially turned so that the jack is rotated. Forty V-grooves 48 can push up the conductive rod 11 and increase the contact pressure of the ground electrode tip.

  FIG. 9 is an enlarged cross-sectional view of the ground wire connecting portion 50. A pipe cylinder 11A is welded to the base of the electric conductor 11, and the tip of a shaft 54 with a pipe-like cylinder 53 fixed to the outer periphery thereof is rotatably inserted into the pipe cylinder 11A. Is secured by a screw 52 positioned at The rear end of the shaft 54 has a large diameter to prevent the cylinder 53 from coming out backward. The tube 53 is provided with a screw 55, and a clasp 56 is fixed to the tube 53 with the screw 55. The clasp 56 has a hole 60, and the ground wire 51 coming from the welding machine is fixed by a bolt 57 and a nut 58 using the hole 60.

  Since a large amount of current flows through the ground wire 51, a thick wire is used, and the ground wire 51 may be carried around every work place, and the ground wire 51 may remain strongly twisted. For this reason, the cylinder 53 rotates until the twisting force is eliminated so that the twisting force is not transmitted to the conductor 11, and the twisting force is not transmitted to the conductor side. However, burning may occur due to energization of an excessive current, and damage may progress to prevent rotation, and the structure can be disassembled and replaced with a set screw 52 so that it can be replaced when damaged.

  FIG. 10 shows an application modification of the present invention, and shows an embodiment of connection of a ground wire attached to an intermediate portion of the ground wire. The problem of twisting of the ground wire when the ground wire is connected needs to be solved not only with the ground electrode tip but also with a general ground connection. For this reason, there is a case where a mechanism for eliminating twisting of the ground wire is required in the middle from the electric welding machine to the ground connection portion instead of connecting to the conductor 11, and FIG. 10 shows the middle of the ground wire derived from the present invention. A device to be installed in the department is proposed. When the configuration shown in FIG. 10 is adopted, the electrode tip holder shown in FIGS. 2, 3 and the like is reduced in weight, and there is a secondary advantage that the burden on the automobile body is reduced.

FIG. 15 is a detailed cross-sectional view of a permanent jack portion showing a modification of the type in which the jack 40 and the ground wire connecting portion 50 are connected. The front part of the pipe-shaped coupling cylinder 77 is fixed to the rear end of the conductor 11 with an insertion screw 80. Then, a support shaft from the ground wire connecting portion 81 is inserted into the rear portion of the coupling cylinder 77 so as to be rotatable about the axis, and a retaining screw 82 is positioned at the small diameter portion 86 at the tip of the support shaft to couple the coupling cylinder. Fix to 77. The other end portion of the ground wire connecting portion 81 is provided with a thin cylindrical portion 84 having a hole 83 into which the ground wire 51 can be inserted, and the ground wire 51 is caulked and fixed by a thin pipe portion 84, whereby the ground wire 51 is It is supported so as to be rotatable around its axis. Further, a screw hole 76 penetrating in the vertical direction is formed in the middle of the coupling cylinder 77, a jack bolt 75 is screwed into the screw hole 76, and a metallic umbrella-shaped member 72 is formed below the jack bolt 75. A stand member provided with a soft member 71 on the peripheral surface is attached with a piece 74 and a screw 73 so as to be freely rotatable, and a disk-like operation knob 79 is fixed to the upper portion of the jack bolt 75.
With this configuration, the permanent jack 70 is permanently installed on the conductor 11 as shown in FIG. 16, and the convenience of using the jack immediately as needed increases. Became more compact.

Hereinafter, examples according to embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 11 shows an embodiment of a welding ground electrode tip holder according to the present invention.
An example of repair of a car body plating will be shown. As shown in FIG. 1, the puller electrode tip 2 is welded to the recess 3 and the recess 3 is pulled out in order to pull out the recessed portion (recess) 3 as much as possible, but the puller power source chip 2 is welded. As described above, it is necessary to separately install a ground electrode in order to achieve this.

  The main body of an automobile is an iron plate, but recently, the use of aluminum or resin is increasing for weight reduction. The body shown in the embodiment will be described as a composite body of a steel plate body 6 and a non-magnetic material body 7.

  1 is peeled off from the welded surface 19 of the body portion 6 that can be energized, and the screw rod 13 of the earth electrode tip 10 is brought into contact with the concave portion 3 of the correction portion shown in FIG. The adsorption device 20-1 is adsorbed at a distance L1 so that the screw rod 13 is perpendicular to a certain welded surface.

  In the conventional example shown in Patent Document 1, there is a defect that the material of the surface to be magnetized can be applied only to the material to be magnetized by the magnet because of the magnetized by the magnet. As long as the ears, which are conical hems, are flat and smooth enough to touch the entire circumference, they can be adsorbed regardless of the material of the adsorbing surface. An optimum ground electrode tip holder for welding can be provided.

  In FIG. 6, when the female screw 26 of the suction device 20-1 is loosened and the plate 24 is played and pressed against the suction surface, the suction cup 23 is deformed and the space A 22 is crushed. As the pressure increases, the pressure becomes negative and is attracted to the suction surface 21. The suction force of the suction cup 23 is so small that it is pressed by hand. Therefore, when the female screw 26 is pushed down with the screw, the upper part of the suction cup 23 is lifted, the volume of the space A22 increases, the negative pressure is increased, and the suction force by the suction cup 23 becomes strong. .

  With the holder 20-2 provided above the suction device 20-1 that is firmly adsorbed, the conductor 11 penetrating the holding body 28, the attachment A31, and the attachment B32 shown in FIG. Then, the fixture A31 is attracted to the knob 30 side, and the conductor 11 is fixed to the holding body 28.

  Again, confirm that the screw rod 13 at the tip of the fixed conductor 11 is perpendicular to the non-welded surface. If there is a correction, loosen the knob 30 and make the screw rod 13 of the conductor 11 vertical. Adjustment is performed by rotating or sliding the conductor 11, and the conductor 11 is fixed by the knob 30.

  The contact tool 12 at the tip of the conductor 11 is screwed, and the contact surface 15 is brought into contact with the welded surface 19. A jack 40 is installed at a portion of a distance L2 substantially equal to the distance L1 between the suction device 20-1 and the earth electrode chip 10, and the V groove 48 at the tip of the receiver 44 shown in FIG. The knob 43 is turned to lift the receiver 44, and the screw rod 13 of the earth electrode tip 10 and the contact surface 15 of the contact tool 12 are strongly pressed against the surface to be welded 19 based on the principle of lever using the suction device 20-1 as a fulcrum. It is possible to prevent melting damage due to a large current during welding.

  As shown in FIG. 2, the pressing force on the contact surface by the jack 40 is strengthened on a straight line connecting the action point T of the lifting force of the jack 40 acting vertically and the action point R of the pressing surface of the earth electrode chip 10. Since the center S of the suction cup device 20-1 serving as a fulcrum of the insulator is arranged, and the center of the conductor 11 is on the R, S, T line, the lifting load is efficiently converted into the pressing load with certainty. I can tell you.

  In the case of the permanent jack 70 shown in FIG. 16, the jack bolt 75 is screwed up and down on the coupling cylinder 77 fixed to the rear part of the conductor 11, and is permanently installed at the stable position. There is an advantage that the labor of setting is omitted, and the operation of rotating the jack bolt 75 can be quickly performed with the operation knob 79 in a stable posture at a position matched with the axis of the conductor 11. When the jack is not used, the jack bolt 75 may be raised to retract the umbrella-like member 72 upward. There is no need to lose the jack, and the labor of searching for each work can be omitted, thereby contributing to improvement in work efficiency.

  FIG. 12, FIG. 13 and FIG. 14 are diagrams for explaining the structure of the development process leading to the present invention, and show an example of attachment of the earth electrode tip 10, the suction cup device 20-1, and the jack 40. FIG. FIG. 12 is a top view, but the suction portion center V of the suction device 20-1 is shifted by L with respect to the line between the center U of the earth electrode tip 10 and the push-up center W of the jack 40.

  Although there are few cases where the jack 40 is used for a thick exterior member made of metal, even with this structure, the workability can be exhibited temporarily. However, as described above, in order to reduce the weight of automobiles in recent years, the use of a thin iron plate or the use of an aluminum material When an exterior member made of a non-conductive material is used, the jack 40 is often required, and when such a jack is required, the jack 40 is used with the three points shifted as described above. When the conductor 11 is pushed up, it is separated from the suction portion center V of the suction device 20-1 by a distance L, so that the pushing force acts on the conductor 11 and acts as a moment for tilting the suction device 20-1. For this reason, as shown in FIG. 14, the suction cup is lifted to one side and comes off with a weak force, and the case where the force of the jack 40 cannot be effectively transmitted to the earth electrode tip portion occurs. In order to further solve these problems The present invention has been invented.

  The suction cup 23, which is the contact surface of the body for both the suction device 20-1 and the jack 40, is made of a soft resin material, and the base 41 of the jack 40 is made of a slightly hard resin, so that there is little adhesion of iron powder in the repair shop. Even if it adheres, it is made of a material softer than iron powder. At the time of attachment, the suction cup 23 and the base 41 side are deformed and the body is not damaged.

    The present invention is widely used for repairing automobile sheet metal as its main application. In addition to automobiles, it can be used for a wide range of applications such as repairing shutters and exterior covers for electrical appliances such as air conditioners, as well as agricultural and construction machinery. The application of the present invention is not limited to automobile repair.

It is the schematic explaining the effect | action of a recessed part repair operation | work. FIG. 4 is a top view (plan view) of FIG. 3. It is a side view of an earth electrode device. It is a detailed sectional view of an earth electrode tip. It is explanatory drawing at the time of inclination of a ground electrode tip. It is detailed sectional drawing of an adsorption | suction apparatus. FIG. 7 is a detailed cross-sectional view of the holder portion of FIG. 6. It is a detailed sectional view of a jack part. It is a detailed sectional view of a ground wire connection part. It is a figure of the other Example of a ground wire connection part. It is a figure explaining the actual attachment of a ground electrode tip. It is a top view (plan view) of the structure for explaining the development process of the present invention. It is a side view of FIG. It is a front view of FIG. It is detail sectional drawing of the permanent jack part which shows the modification of the type which connected the jack and the earth wire connection part. FIG. 16 is an equipment diagram in which the permanent jack of FIG. 15 is mounted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric welding machine 2 Puller electrode tip 3 Recessed part 4 Positive electrode 5 Ground electrode 6 Iron plate body
7 Non-magnetic material body 8 Positive wire 10 Ground electrode tip 11 Electric body 12 Contacting tool 13 Screw rod 14 Set screw 15 Contact surface 16 Female screw 17 Gap 18 Welded surface 20-1 Suction device 20-2 Holder unit 21 Suction surface
22 Space A
23 Suction cup 24 Plate 25 Space B
26 Female screw 27 Male screw 28 Holding body 29 Nut 30 Knob 31 Mounting tool A
32 Attachment B
33 hole 34 groove 35 groove of holding body 36 hook of fitting B 37 screw 40 jack 41 base 42 screw 43 knob 44 receiving 45 ring 46 receiving groove 47 knob groove 48 V groove 50 ground wire connecting portion 51 ground wire 52 stopper Screw 53 Tube 54 Shaft 55 Screw 56 Clasp 57 Bolt 58 Nut 59 Clasp 60 Hole 70 Permanent jack 71 Soft member 72 Umbrella member 73 Screw 74 Frame 75 Jack bolt 76 Screw hole 77 Coupling cylinder 78 Hole 79 Operation knob 80 Set screw 81 Ground wire connection part 82 Retaining screw 83 Hole 84 Thin pipe part 85 Clothing material 86 Small diameter part L Distance between U-W line and V L1 Center distance between earth electrode tip and adsorption device L2 Adsorption device Center and jack center distance R Earth electrode tip center S Suction device Center of the jack shown in the center W Figure 13 of the suction device illustrated from the center h suction surface of the center T jack grounding electrode tip center V Figure 13 showing the height U 13 to conductor

Claims (8)

  A suction device that is brought into close contact with the surface of the work piece by elastic contact with a soft member, and a ground electrode tip fixed and held in a vertically swingable and reciprocatingly slidable state on a holder portion provided integrally with the suction device And a grounding electrode for welding, wherein the position of the conductor relative to the holder portion is adjusted so that the tip side of the grounding electrode tip is pressed against the surface of the workpiece. Tip holder.   The suction device that is in close contact with the workpiece to be welded is composed of a suction cup, and has a function of forcibly increasing the suction force of the suction cup by providing a pressing means for forcibly pressing the suction cup against the surface to be welded. The ground electrode tip holder for welding according to claim 1, wherein:   To connect the ground wire from the welding machine to the base end side and attach the conductor with the ground electrode tip attached to the tip, the holder part fixed and held by the adsorption device is formed in a block-shaped holder, The ground electrode tip holder for welding according to claim 1 or 2, wherein the conductor is attached by means of attachments A and B which are fixed to the holding body so as to be displaceable.   4. The welding ground electrode tip holder according to claim 1, wherein the conductors attached by the attachments A and B which are fixed to the holding body so as to be displaceable have a round bar shape with a circular cross section.   The ground electrode tip holder for welding according to claim 1, 2, 3, and 4, wherein the earth electrode tip and the suction device are provided on the center line of the conductor when viewed from above, and the conductor is formed in a straight line.   The conductor ground wire connection part is structured so that the ground wire from the electric welding machine can be rotated in the circumferential direction and can be joined and fixed in the axial direction so that it can be easily replaced when the connection part is burned by an energizing current. 6. The ground electrode tip holder for welding according to claim 1, further comprising a ground wire connecting portion having a structure.   The fitting with the female screw of the adjustable fitting attached to the screw of the screw rod of the earth electrode tip part has a flexible backlash configuration, and the fitting is evenly matched to the inclination of the surface to be welded. The grounding electrode tip holder for welding according to claim 1, 2, 3, 4, 5, or 6, which has a structure for contact.   To set the length of the conductor, secure the height from the suction surface of the suction device to the conductor so that the jack for pressing the ground electrode tip to the surface to be welded can be easily attached. The welding conductor according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the length of the conductor is secured so that the jack can be installed from the suction position at a distance substantially equal to the distance from the position to the ground electrode tip. Earth electrode tip holder.

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