JP3224741U - Upper electrode position detector of welding machine - Google Patents

Abstract

In a spot welding machine such as a nut welding machine, the position of an upper electrode can be prevented by checking the position of the upper electrode at the time of welding to prevent problems such as welding of two pieces overlapped and defects such as attaching nuts having different heights. Provide a detector. In a welding machine (1), a work (W) or a nut (N) set on a lower electrode (2) is sandwiched by an upper electrode (4) that can be raised and lowered, and a current is applied while applying pressure to weld the work. In order to detect the position of the upper electrode at the time of welding, an engaging body 7 which moves up and down integrally with the upper electrode, and a position detecting body 5 which is attached to a fixed portion of the welding machine and has a sliding type variable resistor are provided. The vertical bar 9 is connected to the sliding portion of the vertical bar 9, and the engaging body 7 is engaged with the top 10 of the vertical bar 9 during the lowering stroke of the upper electrode. [Selection diagram] Fig. 1

Description

  The present invention, for example, in a welding machine such as a nut welding machine, by checking the position of the upper electrode at the time of welding, in order to prevent defects such as welding of two overlaps and nuts with different heights. Technology.

  Conventionally, in a spot welder, an upper electrode that can be raised and lowered to pressurize and energize by sandwiching the workpiece set on the lower electrode to detect inappropriate setting of the workpiece such as steel plate and nut A technique for measuring the lowering position of the upper electrode is known, and a technique for using a potentiometer that moves up and down integrally with the upper electrode to measure the position of the upper electrode is known. (See, for example, Patent Document 1.) In this technique, a potentiometer (linear slide type variable resistor) is arranged in parallel with a vertical cylinder for raising and lowering an upper electrode, and a shaft for detecting the potentiometer is used. By connecting the tip of the rod to the rod end of the vertical cylinder, the amount of movement of the detection shaft and the rod is equalized, and the lowered position of the upper electrode is measured by a potentiometer.

JP-A-2015-27680.

  However, in this technique, the moving stroke of the potentiometer detection shaft is the same as the lifting stroke of the upper electrode, and the lifting stroke of the upper electrode is usually large. Of the potentiometer, and the durability of the potentiometer is inferior.

  Therefore, an object of the present invention is to improve the durability of a linear slide type variable resistor in a position detecting body of an upper electrode using a linear slide type variable resistor.

  In order to achieve the above object, the present invention provides a welding machine for welding an object to be welded by sandwiching the object to be welded set on a lower electrode with an upper electrode that can be moved up and down and applying current while pressing the upper and lower electrodes. In the upper electrode position detector of the welding machine for detecting the position of the upper electrode during welding, the position detector is a member that is constantly urged upward and moves up and down integrally with the upper electrode during the lowering stroke of the upper electrode. An ascending and descending member is provided which engages with the union and descends together, and this ascending and descending member is connected to a sliding member of a linear sliding type variable resistor.

As described above, the elevating member that is always urged upward and is lowered together with the engaging body that moves up and down integrally with the upper electrode during the descent stroke of the upper electrode is provided. By connecting to the sliding member of the variable resistor, the lifting stroke of the lifting member can be made smaller than the lifting stroke of the upper electrode, and the durability of the linear sliding variable resistor can be improved. Moreover, the measurement position is accurate by measuring the lowering position of the upper electrode with the linear slide type variable resistor.

At this time, if the lifting member is provided with a stroke adjusting mechanism capable of adjusting a lifting stroke, the stroke amount can be adjusted to a user's desired stroke amount, which is convenient.
In addition, as the engaging body that moves up and down integrally with the upper electrode, if a plurality of mounting members are used to diversify the mounting position and mounting posture on the upper electrode side, the form of the welding machine used by the user It is convenient because the engaging body can be attached in accordance with the condition.

  In addition, the mounting member of the engaging body that directly engages with the elevating member is provided with an insulating material for preventing electrical conduction between the elevating member and the elevating member. It is preferable because it can be prevented.

Upper electrode position detection that detects the position of the upper electrode during welding of a welding machine that welds the object to be welded by sandwiching the object to be welded set on the lower electrode with the upper electrode that can be raised and lowered and applying current while applying pressure A body is provided, and as this position detecting body, an ascending / descending member is provided which is constantly urged upward and engages with an engaging body which ascends and descends integrally with the upper electrode during the descending stroke of the upper electrode and descends together. By connecting this lifting member to the sliding member of the linear sliding variable resistor, the lifting stroke of the lifting member can be made smaller than the lifting stroke of the upper electrode, improving the durability of the linear sliding variable resistor. Can be done. At this time, if the elevating member is provided with a stroke adjusting mechanism that can adjust the elevating stroke, adjustment according to the preference of the user is possible, and as an engaging body that moves up and down integrally with the upper electrode, If it is composed of a plurality of assembling members, the engaging body can be attached according to the mode of the welding machine used by the user, which is convenient.
Furthermore, if an insulating material for preventing electrical conduction is provided between the elevating member and the mounting member that directly engages with the elevating member of the engaging body, damage to the pressurizing cylinder of the welding machine can be prevented. Is preferred.

FIG. 4 is an explanatory view of a portion mainly including an upper electrode of the nut welding machine according to the present invention. It is explanatory drawing which expanded the part which shows the relationship between this position detection body and an engagement body. It is explanatory drawing which shows an example at the time of changing the combination of the assembly member of an engagement body. It is explanatory drawing which shows an example of the assembly member of this engagement body. It is explanatory drawing which shows an example of the electrical insulation of the front-end | tip part of an assembly member.

An embodiment of the present invention will be described with reference to the accompanying drawings.
The upper electrode position detector according to the present invention is a linear slide variable resistor, which aims to increase the durability of the linear slide variable resistor in the upper electrode position detector using a linear slide variable resistor. The sliding amount of the sliding member is reduced.

  That is, in the present embodiment, the present upper electrode position detecting body is applied to the upper electrode side of the nut welding machine, and the nut welding machine 1 has a workpiece such as a steel plate or a welded weld as shown in FIG. A lower electrode 2 on which a nut N is placed and an upper electrode 4 which can be moved up and down by a driving source 3 are provided. A workpiece W and a nut N with a weld are placed on the lower electrode 2 with the upper electrode 4 raised. After that, the upper electrode 4 is lowered by the operation of the drive source 3, the work W and the nut N with a weld are sandwiched and pressurized. The weld at the lower end is melted and welded.

  At this time, the upper electrode position detecting body 5 is configured to detect the position of the upper electrode 4 at the time of descent together with the engaging body 7. If the height is not regular, the height position of the upper electrode 4 is out of the normal range, and the signal from the position detector 5 is controlled so that the energizing operation is not performed.

  In this case, in the technique of JP-A-2015-27680 described in the related art, a potentiometer (linear slide type variable resistor) is arranged in parallel with a vertical cylinder for raising and lowering the upper electrode. Since the tip of the potentiometer detection shaft and the rod tip of the vertical cylinder are directly connected, the travel stroke of the potentiometer detection shaft is the same as the vertical stroke of the upper electrode, and if welding work is repeated many times As described above, the wear of the slide portion of the potentiometer becomes severe, and the durability of the potentiometer is inferior.

  Therefore, the upper electrode position detector 5 is provided with an elevating member 6 which descends in the middle of the elevating stroke of the upper electrode 4 in synchronism with the lowering of the upper electrode 4, and an engaging member 7 which is detachable from the elevating member 6. By connecting the upper end of the elevating member 6 to the sliding member of the linear sliding variable resistor, the final descending position of the upper electrode 4 can be confirmed. The sliding amount is shorter than the vertical stroke of the upper electrode 4 to improve the durability of the linear slide type variable resistor.

  That is, as shown in FIG. 2, the upper electrode position detector 5 is provided with a linear slide type variable resistor (not shown) inside a U-shaped frame 8 and slides the variable resistor. A member (not shown) is slidable in the vertical direction, and a vertical bar 9 of a lifting member 6 extending downward is connected to the sliding member. Is mounted. The top 10 can be screwed into a screw portion 9n at the lower end of the vertical bar 9 and can be moved up and down, and a stopper s for regulating the lower position of the top 10 near the lower end of the screw portion 9n. Are provided, and the vertical bar 9, the top 10, and the stopper s constitute the elevating member 6.

    An air cylinder 11 for constantly urging the elevating member 6 upward is disposed at an upper portion inside the frame 8, and an air hose (not shown) for feeding pressurized air is connected to the air cylinder 11. are doing.

  An attachment member 12 is attached to the back side of the position detecting body 5, and the attachment member 12 is attached to a fixed portion of the welding machine 1.

  On the other hand, as shown in FIG. 4 in the present embodiment, the engaging body 7 is composed of three mounting members, that is, first to third mounting members 13, 14, and 15. It is attached to an arbitrary position of a member that moves up and down in synchronization with the upper electrode 4.

By configuring the engaging body 7 from the plurality of assembly members 13, 14, and 15 in this manner, the mounting location of the engaging body 7 and the change in the posture of the engaging body 7 can be diversified, and the user can use it at his own place. It can be mounted in a different form according to the mode of the welding machine. 2 is a horizontal surface such as an upper surface or a lower surface, but as an example of a mode such as a change in posture of the engaging body 7 when the mounting place of the engaging body 7 is a vertical surface. As shown in FIG.
In addition, the number of divisions, the shape, and the like of the assembly member are arbitrary.

  The third assembling member 15 has a bifurcated portion that moves up and down with the vertical bar 9 interposed therebetween. A bifurcated insulating material 16 is attached to the bifurcated portion, and the bifurcated portion of the insulating material 16 is made of metal. It is fixed in a state that it protrudes inward from the forked portion of the third assembling member 15, and even when the forked portion of the third assembling member 15 contacts the vertical bar 9 made of metal, the electric power is cut off. Have been to be.

  This is because the conductive state between the vertical bar 9 and the engagement body 7 may damage the pressurizing cylinder of the welding machine.

  With the configuration of the position detection body 5 and the engagement body 7 as described above, the third assembly member 15 of the engagement body 7 engages with the top 10 and pushes down the vertical bar 9 during the stroke of the lowering of the upper electrode 4, The final position of the upper electrode 4 is measured with a linear slide type variable resistor. When the measurement is completed, the upper electrode 4 is raised by the operation of the drive source 3, and the vertical bar 9 of the position detector 5 is restored to the original position by the urging force of the air cylinder 11. At this time, the elevating stroke of the elevating member 6 of the position detector 5 can be made smaller than the elevating stroke of the upper electrode 4, and the durability of the linear slide type variable resistor can be improved.

  Although the elongated hole n is formed in the second assembling member 14, when the engagement body 7 is assembled, the second assembling member 14 is assembled so that the elongated hole n is in the vertical direction. The elongate hole n of the assembling member 14 and the screw portion 9n of the vertical bar 9 are used as a stroke adjusting mechanism so that the elevating stroke of the elevating member 6 can be adjusted.

That is, the procedure for setting the elevating / lowering stroke of the elevating member 6 in the present embodiment is as follows. First, the coupling between the second assembling member 14 and the first assembling member 13 is temporarily connected to loosen the degree of coupling. By lowering the top 10 of the elevating member 6 of the detection body 5 to the lowermost stopper s of the screw portion 9n and lowering the upper electrode 4 to the lowest, the insulating material 16 of the third assembly member 15 Then, the connection between the second assembly member 14 and the first assembly member 13 is fully tightened in this state.
Then, by moving the top 10 to the uppermost part of the screw portion 9n with the upper electrode 4 raised, the length of the screw portion 9n can always be set to the lifting stroke of the lifting member 6.
In this case, the position of the second assembling member 14 and the first assembling member 13 is adjusted up and down so that the elevating member 6 can be moved up and down within the length range of the long hole n of the second assembling member 14. The stroke can be adjusted arbitrarily.

The present invention is not limited to the above embodiment. Those having substantially the same configuration as those described in the claims of the present invention and exhibiting the same functions and effects belong to the technical scope of the present invention.
For example, the present welding machine 1 is not limited to a welding machine for attaching nuts, but is also applicable to a spot welding machine, a welding machine with bolts, and the like.

  Since it is possible to accurately ascertain the state of a defective setting of the work to be welded and to improve the durability of the detection body, widespread use in the field of welding in particular is expected in the future.

  DESCRIPTION OF SYMBOLS 1 ... welding machine, 4 ... upper electrode, 5 ... position detecting body, 6 ... elevating member, 7 ... engaging body, 9 ... vertical bar, 15 ... 3rd assembly member, 16 ... insulating material.

Claims (4)

The position of the upper electrode at the time of welding of a welding machine that welds the object to be welded by sandwiching the object to be welded set on the lower electrode with the upper electrode that can be raised and lowered and applying current while pressing the upper and lower electrodes is detected. An upper electrode position detecting body of the welding machine, the position detecting body being constantly urged upward and being engaged with an engaging body that moves up and down integrally with the upper electrode during the lowering stroke of the upper electrode. An upper electrode position detector for a welding machine, comprising: a descending elevating member, wherein the elevating member is connected to a sliding member of a linear slide type variable resistor. 2. The upper electrode position detector according to claim 1, wherein the lifting member includes a stroke adjustment mechanism that can adjust a lifting stroke of the lifting member. 3. 3. The engaging body that moves up and down integrally with the upper electrode includes a plurality of mounting members in order to diversify mounting positions, mounting postures, and the like on the upper electrode side. 4. 3. An upper electrode position detector for a welding machine according to claim 1. 4. An assembly member of the engaging body which directly engages with the elevating member is provided with an insulating material for preventing electrical conduction between the elevating member and the assembling member. An upper electrode position detector for a welding machine according to any one of the preceding claims.

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