JP3892816B2 - Welding electrode removal tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a welding electrode tip removal tool used for removing an electrode tip by manual operation when replacing a cap-shaped electrode tip attached to a tip of a shank for welding electrode.
[0002]
[Prior art]
Since this type of electrode tip wears and deforms during use and deteriorates the quality of welding, it is necessary to replace it whenever it is used for a certain period of time. Various proposals have been made.
[0003]
These electrode tip removal means include, for example, a form pre-installed in a resistance welding machine such as a welding robot as in Patent Documents 1 to 4, and a manual removal tool as in Patent Documents 5 to 7. It is roughly divided into two types.
[0004]
Patent Document 1: Japanese Patent Laid-Open No. 7-171686 Patent Document 2: Japanese Patent Laid-Open No. 2002-79382 Patent Document 3: Japanese Patent Laid-Open No. 2002-239749 Patent Document 4: Japanese Patent Laid-Open No. 2002-346759 Patent Document 5: Japanese Utility Model Publication No. 63-147273 Patent Document 6: Japanese Utility Model Application Publication No. 07-33471 Patent Document 7: Japanese Patent Application Laid-Open No. 2001-347380
[Problems to be solved by the invention]
However, in the case of the removal means according to the former form, (1) since it is installed individually, it is necessary to provide a large number of versatility, and (2) automatic positioning using a positioning device. (3) The structure is complicated, and expensive and precise parts such as motors and cylinders are required. Therefore, there are problems such as that it cannot be provided at low cost and lacks durability.
[0006]
Further, in the case of the detaching means according to the latter form, there is no problem like (1), (2), (3) by the former, but the cap-shaped electrode tip attached to the tip of the shank is pushed out in an insulator manner. Because of the structure to be removed, according to the results of the implementation of Patent Document 5 previously proposed by the present applicant, it has been found that there are the following problems when removing.
[0007]
That is, when the electrode tip is attached to a shank having a stepped shape with a small-diameter tapered portion at the tip of the large-diameter base, an annular insertion groove is formed between the tip of the large-diameter base and the base end of the electrode tip. When the expanding piece having a U-shaped cross section is inserted into the annular insertion groove and spread in a lever-like manner when removing, the expanding piece expands in an arcuate locus.
[0008]
In this way, when the spreading piece does not spread horizontally along the axis of the shank, but spreads in an arcuate locus, the electrode tip is not easily and reliably removed, The annular edges (end faces and edges) protruding on both sides of the annular insertion groove are damaged and deformed by the non-uniformly pressed parts of the expanded piece, and the influence on the shank side that needs to be used repeatedly is particularly large. is there.
[0009]
Therefore, in the present invention, a tool for removing a welding electrode tip that can solve the problems caused by these conventional techniques is provided, and in particular, the expanding piece is expanded horizontally along the axis of the shank. The main purpose of this is to prevent damage and deformation of the shank that needs to be used repeatedly, and to make this arrangement simple and inexpensive to provide and durable.
[0010]
[Means for Solving the Problems]
The welding electrode tip removal tool according to the present invention has a fixed portion with a fixed-side holder attached to the tip of one operation lever, a turning arm attached to the tip of the other operating lever, and pivotally attached to the turning arm. It is comprised with the movable part which attached the movable side holder via the axis | shaft.
[0011]
The fixed-side holder and the movable-side holder have a U-shaped fitting support groove to be mounted on the welding electrode shank and the electrode tip, and project between the inner end side of the fitting support groove and formed between the shank and the electrode tip. Each of the expanding pieces to be mounted in the annular insertion groove is provided, and the holders are connected to each other by a connecting shaft so as to be horizontally expandable / contractable via a spring member.
[0012]
Further, the rotating arm is provided with a cam surface which is gradually increased in distance from the pivot shaft, and the fixed side holder has a pivot arm cam which is pivoted about the pivot shaft by operation of the other operation lever. A cam guide surface that receives the pressure of the surface is provided, and the spring member is compressed by the pressure of the cam surface to separate the movable holder in the horizontal direction.
[0013]
In this welding electrode tip removal tool, the fitting support groove of the fixed side holder is attached to the shank and the fitting support groove of the movable side holder is attached to the electrode tip, and each expansion formed in each fitting support groove is provided. Set one piece on the welding electrode in a state where it is mounted in the annular insertion groove between the shank and the electrode tip, hold each operating lever, and rotate the other operating lever with the rotating arm attached. The electrode tips can be removed by separating the pieces.
[0014]
In this removal operation, when the pivoting arm pivots around the pivot shaft, the cam surface provided on the pivot arm presses the cam guide surface provided on the fixed side holder, and this pressing pivots on the pivot arm. The movable side holder pivotally attached to the shaft is pulled apart in the horizontal direction along the connecting shaft that is attached while compressing the spring member, and is separated from the fixed side holder, so that it is locked to each expanding piece. The shank and the electrode tip are separated.
[0015]
In this way, the annular edge portions (end face and end edge) protruding on both sides of the annular insertion groove are uniformly pressed by the expanding piece, while being separated in a horizontal state along the axial direction of the welding electrode, Unlike the prior art in which the expanding piece expands along an arcuate path, the electrode tip can be easily and reliably removed, and the annular edges on both sides of the annular insertion groove are damaged and deformed. There is nothing.
[0016]
In particular, the economical effect of preventing damage and deformation to the shank side that is used repeatedly is enormous, and the structure is simple, the number of parts is small, and expensive and precise parts are not required. Can be used for a long period of time.
[0017]
In addition, it has the versatility that it can be freely carried and the desired electrode tip can be removed, it is economical because it can be shared and it is not necessary to have many, and it can be positioned visually without relying on a positioning device. Can also be expected.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the welding electrode tip removal tool according to the present invention will be described in detail based on the removal tool 1 according to the illustrated embodiment to which the present invention is applied. FIG. 1 is an overall front view, and FIG. 3 is an exploded perspective view, FIG. 4 is a partially enlarged cross-sectional view, FIG. 5 is a front view in use, and FIGS. 6 and 7 are plan views in use. Show.
[0019]
The removal tool 1 includes a fixed portion 1A in which a fixed side holder 3 is attached to the tip of one operating lever 2, and a movable portion 1B in which a movable side holder 6 is attached to the tip of the other operating lever 4 via a rotating arm 5. The movable side holder 6 is pivotally attached to the rotary arm 5 via a pivotal attachment shaft 7 and is connected to the fixed side holder 3 via a connection shaft 9 elastically mounted on a spring member 8. ing.
[0020]
The welding electrode 10 includes a shank 11 and an electrode tip 12. The shank 11 has a large-diameter base portion 11b and a small-diameter taper portion on the distal end side of a support portion 11a attached to a resistance welding machine (not shown) such as a welding robot. 11c is formed, and the cap-shaped electrode tip 12 is attached to the small-diameter tapered portion 11c. Between the distal end of the large-diameter base portion 11b and the proximal end of the electrode tip 12, an annular insertion is made on the outer peripheral surface of the tapered portion 11c. A groove 13 is formed.
[0021]
The fixed-side holder 3 is provided with a U-shaped fitting support groove 14 into which the large-diameter base portion 11 b of the shank 11 can be inserted, and a fitting support groove on the inner edge adjacent to the movable side holder 6. 14 is provided with an expanding piece 15 formed by a U-shaped flange that can be inserted into the annular insertion groove 13 in a manner that protrudes from the inner surface of the annular insertion groove 13, and the both sides are flattened on the outer side, and the rotational sliding surface 16A (16) And a flange portion 18 whose inner surface forms a cam guide surface 17 is provided on the outer edge of the rotary sliding surface 16A.
[0022]
The movable side holder 6 is provided with a U-shaped fitting support groove 19 to be attached to the electrode chip 12, and protrudes from the inner surface of the fitting support groove 19 at the inner edge adjacent to the fixed side holder 3. An expanded piece 20 formed of a U-shaped flange to be mounted in the annular insertion groove 13 is provided, and both sides are flattened on the outer side to form a rotary sliding surface 16B (16). Screw holes 21 and 22 are provided in 16B.
[0023]
The rotating arm 5 is formed of a U-shaped frame that sandwiches the rotational sliding surface 16B of the movable side holder 6 from both sides, and through holes 22 and 22 are provided on the front end side of the frame. The formed pivot shaft 7 is inserted into the through hole 22 and screwed into the screw hole 21 so as to be pivotally mounted to the movable side holder 6, and an arc cam on the bottom side of the frame. Surfaces 23 and 23 are provided, and the cam surface 23 is set so that the distance from the pivot shaft 7 as a fulcrum gradually increases.
[0024]
Further, a stepped hole 24 is formed on the bottom side of the movable side holder 6 by a large diameter hole forming the spring accommodating chamber 24A and a small diameter through hole 24 communicating with the spring accommodating chamber 24A. Is provided with a screw hole 25 aligned with the stepped hole 24, and in a state in which the spring member 8 by a coil spring is accommodated in the spring accommodating chamber 24A, the connecting shaft 9 formed by the screw shaft is screwed into the screw hole 25, As a result, the holders 3 and 6 are connected to each other so as to be able to expand and contract.
[0025]
In the removal tool 1 having the above-described configuration, when the welding electrode 10 is set, as shown in FIG. 1, the other operation lever 4 is placed at a right angle with respect to one operation lever 2. As shown in FIG. 6, the expanded piece 15 of the fixed side holder 3 and the expanded piece 20 of the movable side holder 6 are in close contact with each other, and each of the expanded pieces 13 is expanded with respect to the annular insertion groove 13 of the welding electrode 10. Set with open pieces 15 and 20 fitted.
[0026]
When performing the detaching operation, grip the operating lever 2 with one hand and the operating lever 4 with the other hand, and rotate the operating lever 4 clockwise as shown in FIG. 5 with the operating lever 2 fixed. When moved, the rotating arm 5 connected to the operation lever 4 rotates along the rotation sliding surface 16 with the pivot shaft 7 as a fulcrum, while the cam surface 23 gradually approaches the flange portion 18 and the start end side is It abuts on the cam guide surface 17.
[0027]
When the cam surface 23 is further rotated after the contact, the cam surface 23 is set so that the distance from the pivot shaft 7 as a fulcrum is increased. The fixed side holder 3 that has received the light and the movable side holder 6 pivotally attached to the rotating arm 5 are connected by a connecting shaft 9 via a spring member 8. Retracts in a horizontal state while compressing the spring member 8 and is separated from the fixed side holder 3 to form a gap W.
[0028]
Accordingly, the cam surface 23 is set in advance so that the distance from the pivot shaft 7 as a fulcrum is increased by at least the gap W, and the spring member 8 is set in advance to an expansion / contraction width that can be compressed by at least the gap W. The electrode tip 12 can be pulled out and removed from the shank 11 side of the welding electrode 10.
[0029]
In this detaching operation, the shank 11 side of the welding electrode 10 is connected to the expanded piece 20 of the movable side holder 6 with the distal end of the large-diameter base portion 11 b locked by the expanded piece 15 of the fixed side holder 3. Since the base end of the tip 12 is engaged and pulled out in a horizontal state, unlike the prior art in which the expanding piece expands along an arcuate locus, the annular edge (end surface) protruding on both sides of the annular insertion groove And the edge) are uniformly pressed by the spread piece.
[0030]
As a result, the electrode tip 12 can be easily and reliably removed, and the annular edges on both sides of the annular insertion groove 13 are not damaged and deformed, and damage to the side of the shank 11 that is used repeatedly, in particular. The economic effect of preventing deformation is enormous.
[0031]
In addition, since the structure is simple and the number of parts is small and expensive and precise parts such as motors and cylinders are not required, it can be provided at low cost and can be used for a long time with excellent durability. Thus, it is possible to expect effects such as versatility that a desired electrode tip can be removed, economical because it is not necessary to provide a large number of electrode tips, and that positioning can be performed visually without relying on a positioning device.
[Brief description of the drawings]
FIG. 1 shows a front view of an entire removal tool according to an embodiment to which the present invention is applied.
FIG. 2 is a left side view in which a part of the removal tool in FIG. 1 is omitted.
3 shows an exploded perspective view of the removal tool of FIG. 1. FIG.
4 shows a partially enlarged sectional view of the removal tool of FIG.
FIG. 5 shows a front view of the removal tool of FIG. 1 in use.
6 is a plan view of the removal tool of FIG. 1 in use, showing a state where a welding electrode is set. FIG.
7 is a plan view of the removal tool of FIG. 1 in use, showing a state in which the electrode tip has been removed from the shank of the welding electrode.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Removal tool 2, 4 Operation lever 3 Fixed side holder 5 Rotating arm 6 Movable side holder 7 Pivoting axis (rotating fulcrum)
8 Spring member (coil spring)
9 Connecting shaft 10 Welding electrode 11 Shank 12 Electrode tip 13 Annular insertion groove 14, 19 Fitting support groove 15, 20 Expanding piece 16 Rotating sliding surface 17 Cam guide surface 18 Flange portion 21, 22, 25 Screw hole 23 Cam surface 24 Stepped hole W Gap

Claims (1)

A fixed part with a fixed holder attached to the tip of one operating lever, and a movable part with a rotating arm attached to the tip of the other operating lever and a movable holder attached to the rotating arm via a pivot shaft And consists of
The fixed side holder and the movable side holder have a U-shaped fitting support groove to be attached to the welding electrode shank and the electrode tip, and a ring formed between the shank and the electrode tip so as to protrude to the inner end side of the fitting support groove. Each expanding piece to be mounted in the insertion groove is provided, and the holders are connected to each other by a connecting shaft via a spring member so that the holder can be expanded and contracted. The fixed-side holder is provided with a cam guide surface that receives the pressing force of the cam surface of the rotating arm rotated about the pivot shaft by the operation of the other operating lever, and the spring member is compressed by the pressing of the cam surface. A welding electrode tip removal tool, wherein the movable side holder is separated from the fixed side holder while maintaining a parallel state along the connecting shaft .

Images