JP2016103880A - Electrode connection mechanism for welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode connection mechanism for a welding device in which a stator can be disposed in a stationary manner and which can be configured in a small physical status and at low cost.SOLUTION: An electrode connection mechanism 50 is provided in the welding device including a welding torch which is rotated along a welding part 54 to weld the welding part 54, and disposes a stator 5 in the stationary manner, the welding part being formed by abutting terminals of conductor segments 24a-24d which are arrayed in an annular shape on an end face of the stator 5. The electrode connection mechanism comprises: a hold member 62 for positioning and holding the stator 5; an outer electrode 59 which is abutted to the conductor segment 24d, presses it inwards and electrifies the welding part 54; and one rotary cam 56 wich simultaneously drives the hold member 62 and the outer electrode 59.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electrode connection mechanism of a welding apparatus that joins ends of conductor segments to form a winding of a rotating electrical machine.

  The winding of the stator of the rotating electrical machine is formed by joining the ends of conductor segments protruding from the end face of the stator slot. The ends of the conductor segments are evenly arranged on the circumference at the end face of the stator, but the work diameter, the number of winding layers, and the layer pitch differ depending on the type of the stator, so the junction between the ends of the conductor segments The position of is different for each type of stator.

  A technique for joining the ends of the conductor segments by welding is disclosed in Patent Document 1, for example.

  In the technique disclosed in Patent Document 1, a welding torch attached to a robot arm and fixed is provided with a relatively large physique electrode connection mechanism equipped with a large number of electrodes connected to each conductor segment together with a stator. By rotating at a constant speed, the ends of the conductor segments are continuously welded together.

JP 2008-154433 A

  However, in the technique of Patent Document 1 described above, in order to cope with various stators having different numbers of conductor segments, workpiece diameters, and layer pitches, a relatively large physique electrode connection mechanism is provided for each stator. There is a problem that replacement is required, and the setup becomes complicated and a long time is wasted.

  In order to solve this problem, the welding torch is configured to be rotated corresponding to the welded portion by a rotation mechanism such as a robot, and an electrode connection mechanism arranged in a fixed manner is required. The conventional electrode connection mechanism comprises an outer electrode, an inner electrode, a core holding member, three types of levers that drive these three members in the horizontal direction, and three types of cylinders that drive each lever in the vertical direction. . In this configuration, the three types of cylinders that drive the levers are stacked in the horizontal direction, so that the physique of the electrode connection mechanism is large in the horizontal and vertical directions.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an electrode connection mechanism of a welding apparatus in which a stator can be fixedly arranged and can be configured with a small size and low cost.

  In order to achieve the above object, the invention according to claim 1 is directed to a welded portion (54) formed by abutting ends of conductor segments (24a to 24d) arranged in a ring on the end face of the stator (5). An electrode connection mechanism (50) provided in a welding device (1) having a welding torch (2) for welding the welded portion by rotating in accordance with the stator, wherein the stator is disposed in a fixed manner. A holding member (62) for positioning and fixing, an outer electrode (59) that abuts against the conductor segment and presses inward to energize the weld, and the holding member and the outer electrode are driven simultaneously. And a rotating cam (56).

  According to this configuration, the electrode connection mechanism (50) is in contact with the holding member (62) for positioning and fixing the stator (5) and the conductor segment (24d), and presses inward to weld (54). ), And a rotating cam (56) for simultaneously driving the holding member (62) and the outer electrode (59). For this reason, the actuators required for each of the holding member and the outer electrode are integrated into one rotating cam, so that the size of the electrode connection mechanism can be reduced and the manufacturing cost of the electrode connection mechanism can be reduced. There is an effect. Further, since the stator is fixedly disposed, an electrode rotation mechanism is not required, so that the electrode connection mechanism can be reduced in size, and the setup work at the time of replacing the stator is facilitated.

It is a front view which shows the whole structure of the welding apparatus provided with the electrode connection mechanism which concerns on embodiment of this invention. FIG. 2 is a plan view showing a part of an annular arrangement of conductor segment terminals together with an outer electrode (only one is shown) by enlarging the II-II arrow view in FIG. 1. It is a front view of the partial cross section which shows the principal part which the electrode connection mechanism in FIG. 1 expanded with each form in the up-and-down movement end of a shaft. FIG. 4 is a plan cross-sectional view showing an engagement form between a holding member of a rotating cam before rotation and an outer electrode, based on an arrow IV-IV in FIG. 3. FIG. 5 is a plan cross-sectional view showing an engagement form between a holding member of a rotating cam in the middle of rotation and an outer electrode on the basis of the arrows VV in FIG. 3. FIG. 4 is a plan cross-sectional view showing an engagement form between a rotating cam holding member and an outer electrode after rotation based on a view taken along arrows VI-VI in FIG. 3.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, the same reference numerals are given to the portions corresponding to each other in all the drawings in this specification, and the description of the overlapping portions will be omitted as appropriate.

  As shown in FIGS. 1 and 2, a rotating electrical machine winding welding apparatus 1 having an electrode connection mechanism 50 according to an embodiment of the present invention includes a welding torch 2. The stator 5 of the rotating electrical machine (not shown) is fixedly disposed on the electrode connection mechanism 50 as a gantry so that the end face is horizontal. The welding torch 2 is formed so that the ends of the conductor segments 24a to 24d of the stator 5 are in contact with each other, and the welding portions 54 and the welding electrodes 25 that are annularly arranged on the end surface of the stator 5 are opposed to each other. 54 is movable in the radial direction of the annular array, and is arranged and revolved at a setup position positioned at the same diameter as the diameters D1 and D2 of the annular array of the welded portion 54. The welding device 1 is covered with a casing (not shown) that can be freely opened and closed.

  As shown in FIGS. 1 and 2, the conductor segments 24 a to 24 d are accommodated in slots 47 provided in the axial direction of the stator 5 of the rotating electrical machine so that the end portions protrude from the end surfaces. Terminals of the conductor segments 24 a to 24 d that are adjacent to each other in the radial direction of the stator 5 outside the end face of the slot 47 come into contact with each other to form a welded portion 54. The weld 54 is welded by the welding torch 2 to become a winding, and a stator winding is formed. The welded portions 54 with which the ends of the conductor segments 24a and 24b are in contact with each other are arranged in an annular shape having a diameter D1 on the end face of the stator 5 so as to maintain a slight gap between the welded portion 54 and the welding electrode 25. The welding torch 2 is disposed on Further, the welded portions 54 with which the ends of the conductor segment 24c and the conductor segment 24d abut are arranged in an annular shape with a diameter D2 on the end face of the stator 5, and a slight gap is provided between the welded portion 54 and the welding electrode 25. A welding torch 2 is arranged to keep. These welds 54 are welded and joined by the welding torch 2. As shown in FIG. 2, in this embodiment, the winding layer is described as an example of two layers having a diameter D1 and a diameter D2, but the number of winding layers may be three or more. Of course, the diameter and layer pitch of the winding layers differ depending on the type of the stator.

  As shown in FIG. 1, the welding torch 2 performs TIG (Tungsten Inert Gas) welding on the welded portion 54 where the ends of the conductor segments 24 a to 24 d abut. In the welding torch 2, the terminals of the conductor segments 24 a to 24 d are brought into contact with each other by energization from the power connector 26 to the welding electrode 25 made of tungsten in the atmosphere of argon gas which is an inert gas supplied from the gas connector 27. An arc is generated between the welding portion 54 and the welding electrode 25 that are in contact with each other, and welding is performed by melting the welding portion 54 with this arc heat. The air connector 28 is for supplying air to the welding torch 2.

  As shown in FIG. 1, the welding torch 2 is attached to the attachment plate 20 via the setup device 3. The mounting plate 20 is installed between four bushes 22 that slide on four support columns 21 erected on a linear guide 23 with the frame plate 19 installed on the end surface. Further, a ball nut 49 is fixed to the mounting plate 20, and a ball screw 48 screwed with the ball nut 49 is driven and controlled by the servo motor 9 through the pulley 13, the belt 17 and the pulley 14. With such a configuration, the servo motor 9 can maintain the gap between the welded portion 54 and the welding electrode 25 stably and with high accuracy.

  As shown in FIG. 1, the setup device 3 stores a servo motor 10 fixed to the mounting plate 20, a ball screw connected to the output shaft of the servo motor 10 and a ball nut screwed to the servo motor 10. The housing 34 is slidably movable. The arm 35 is fixed to the front end of the housing 34 and has a guide groove 37. The cam follower 36 engages with the guide groove 37. The cam follower 36 and the friction applying device 4 are provided. It comprises a torch support base 38 that supports the welding torch 2.

  The welding torch 2 is attached to the torch support base 38 via a bearing in a state where electrical insulation is ensured by the fasteners 29. With such a configuration, the welding torch 2 is rotatable (spinned) with respect to the torch support base 38.

  A servo motor (not shown) arranged on the back side perpendicular to the paper surface of FIG. 1 controls the pulley board 16 by rotating it so as to be concentric with the central axis of the stator 5. The lower surface of the pulley board 16 is attached to the mounting plate 20 via a bearing. A torch support base 38 is provided on the upper surface of the pulley disc 16 so as to be slidable in the radial direction of the pulley disc 16, that is, in the radial direction of the annular arrangement of the welded portions 54. Since the welding torch 2 is controlled by being driven to rotate by the servo motor 12 from such a configuration, the welding torch 2 can be rotated (revolved) stably and accurately with an arbitrary diameter such as the diameter D1 or the diameter D2.

  As shown in FIG. 1, the friction applying device 4 is erected on the upper surface of the pulley board 16 so as to abut on both side surfaces of the torch support base 38 and slide the torch support base 38. It generates power. The friction applying device 4 can reliably hold the setup position in the radial direction of the stator 5 of the torch support base 38 positioned by the setup device 3.

  As shown in FIG. 1, the linear guide 23 erected on the support column 21 can move horizontally in the direction perpendicular to the paper surface of FIG. 1. When the stator 5 is attached to the electrode connection mechanism 50 installed below the attachment plate 20, the column 21 and the attachment plate 20 are moved by moving the support column 21 in the back direction perpendicular to the paper surface of FIG. The electrode connection mechanism 50 is retracted from above. An electric wire guide 51 is provided in order to prevent excessive deformation due to movement of the column 21 such as electric wires connected to the welding torch 2 and the servo motors 9 and 10.

  According to the configuration described above, the welding torch 2 arranged on the rotating torch support base 38 is positioned at an arbitrary position in the radial direction of the welded portion 54 arranged in an annular shape by the setup device 3 and the friction applying device 4. It becomes possible, and it can be rotated following the welded portion 54 which is fixedly arranged in an annular shape with an arbitrary dimension. However, regardless of this configuration, such an operation may be realized by a robot or the like that can rotate the welding torch.

  As shown in FIGS. 1 and 3, a shaft 8 is provided at the center of the electrode connection mechanism 50 so as to be concentric with the center hole of the stator 5. A shaft driving device 7 that moves the shaft 8 up and down is provided at the lower end of the shaft 8. As shown in FIG. 3, the right half side of the shaft 8 represents a state before the shaft 8 is moved downward, and the left half side of the shaft 8 represents a state after the shaft 8 is moved downward. Since the upper end portion of the shaft 8 has a funnel shape, when the shaft 8 is moved downward by the shaft driving device 7, the sliding piece 61 is driven radially outward by sliding with the inclined surface of the funnel-shaped portion. Move. Then, the inner electrode 60 fixed to the sliding piece 61 moves radially outward and contacts and presses the inner side surface of each conductor segment 24a. As a result, the ends of the conductor segment 24 a and the conductor segment 24 b come into contact with each other to form a welded portion 54, and the welded portion 54 is welded by the welding torch 2 when energized from the inner electrode 60.

  As shown in FIGS. 2 to 4, the outer electrode 59 can be moved radially in the radial direction of the stator 5 by a rotating cam 56 engaged through a pin 57. The outer electrode 59 has a shape in which a saddle-shaped contact portion having a stepped portion 63 is erected on the longitudinal end surface of a domino saddle-shaped base, and is annularly arranged so as to be concentric with the welded portion 54. Yes.

  As shown in FIGS. 3 to 6, the rotating cam 56 is a disk having a cam groove 64 that engages with a pin 57 erected on the lower surface of each outer electrode 59, and rotates concentrically with the annular arrangement of the outer electrodes 59. Arranged freely. The same number of cam grooves 64 as the outer electrodes 59 are annularly arranged in the vicinity of the outer periphery of the rotating cam 56 so as to form an acute angle from the circumferential tangent of the rotating cam 56 to the outer side in the rotating direction of the rotating cam 56. .

  As shown in FIG. 4, the pin 57 located at the outer end of the cam groove 64 before the rotation of the rotating cam 56 is rotated by the lever 66 connected to a driving source (not shown). Since it is driven inward by the cam groove 64, it moves to the inner end of the cam groove 64 as shown in FIGS. Accordingly, each outer electrode 59 moves inward, and the stepped portion 63 of each outer electrode 59 comes into contact with and presses the outer side surface of each conductor segment 24d. As a result, the ends of the conductor segment 24d and the conductor segment 24c come into contact with each other to form a weld 54, and the weld 54 is welded by the welding torch 2 when energized from the outer electrode 59.

  As shown in FIG. 3, the stator 5 placed on the upper surface of the stator receiver 55 is positioned and fixed to the electrode connection mechanism 50 by four holding members 62 provided on the outer periphery thereof. The holding member 62 has an L-shaped cross section, and the bottom surface of the L-shaped short side has a curved surface having the same curvature as the outer peripheral surface of the stator 5. Further, a projecting portion 67 that abuts against an end surface corner of the stator 5 is provided at the tip of the L-shaped short side so as to project from the bottom surface.

  The holding member 62 can be moved radially in the radial direction of the stator 5 by a rotating cam 56 engaged through a pin 58. That is, as shown in FIGS. 4 to 6, the rotary cam 56 has a letter-shaped cam groove 65 for engaging with a pin 58 erected on the L-shaped long side of the holding member 62 inside the cam groove 64. Have. The cam groove 65 includes an arc portion 68 that is a concentric arc with the rotating cam 56, and a bent portion 69 that is bent and extended outward at an acute angle from the end of the arc portion 68 on the rotating cam 56 rotation direction side. .

  As shown in FIG. 4, the pin 58 positioned at the outer end of the bent portion 69 before the rotation of the rotating cam 56 is rotated by the lever 66 connected to a driving source (not shown). Is driven inward by the bent portion 69, and thus moves to the boundary between the bent portion 69 and the arc portion 68 as shown in FIG. 5. Along with this, the holding member 62 moves inward, the bottom surface thereof comes into contact with the outer peripheral surface of the stator 5, and the projecting portion 67 can come into contact with the end surface corner portion of the stator 5. When the rotating cam 56 further rotates, as shown in FIG. 6, the pin 58 reaches the end of the arc portion 68 on the side opposite to the rotation direction. When the pin 58 moves along the arc portion 68 by the rotation of the rotating cam 56, the arc portion 68 is concentric with the rotating cam 56, so the holding member 62 does not move while maintaining its position.

(Electrode connection process)
(1) After the stator 5 is placed on the upper surface of the stator receiver 55 located at the descending end, the rotating cam 56 in the state shown in FIG. 4 is rotated clockwise as indicated by the arrow, and the state shown in FIG. To. Thereby, each holding member 62 moves inward until it contacts the outer peripheral surface of the stator 5 to position the stator 5. At the same time, each outer electrode 59 moves inward in the central axis direction of the stator 5 and approaches each conductor segment 24d.

(2) As shown in FIG. 3, the stator receiver 55 is moved upward by means (not shown), and the end surface corner of the stator 5 is brought into contact with the protruding portion 67 of the holding member 62 to connect the stator 5 to the electrode. Secure to mechanism 50.

(3) The shaft 8 is lowered by the shaft driving device 7, and the inner electrodes 60 are moved radially outward so that the tips of the inner electrodes 60 are brought into contact with the inner side surfaces of the conductor segments 24a and further pressed.

(4) The rotating cam 56 in the state shown in FIG. 5 is further rotated clockwise as indicated by the arrow to obtain the state shown in FIG. Accordingly, the holding member 62 maintains the fixed state of the stator 5 by bringing the bottom surface into contact with the outer peripheral surface of the stator 5 and bringing the protruding portion 67 into contact with the corner of the end surface of the stator 5. 59 moves inward in the direction of the central axis of the stator 5, and each step 63 presses the outer side surface of each conductor segment 24d.

  Through the above-described process, the welded portion 54 including the conductor segment 24a and the conductor segment 24b can be energized from the inner electrode 60, and the welded portion 54 including the conductor segment 24d and the conductor segment 24c can be energized from the outer electrode 59. Thus, all the welds 54 are welded.

  As is clear from the above detailed description, the electrode connection mechanism 50 according to the present embodiment has a holding member 62 for positioning and fixing the stator 5 and a conductor segment 24d and presses inward to press the welded portion 54. And an outer electrode 59 to be energized, and a rotating cam 56 that drives the holding member 62 and the outer electrode 59 simultaneously. Therefore, since the actuators required for each of the holding member 62 and the outer electrode 59 are collected in one rotating cam 56, the size of the electrode connection mechanism 50 can be reduced, and the manufacturing cost of the electrode connection mechanism 50 can be reduced. There is an excellent effect that it can be reduced. Further, since the stator 5 is fixedly arranged, an electrode rotation mechanism is not required, so that the electrode connection mechanism 50 can be reduced in size, and the setup work at the time of stator replacement is facilitated.

  Further, since the rotary cam 56 has a U-shaped cam groove 65, the holding member 62 can be driven in two steps, and the electrode connection can be effectively performed in cooperation with the outer electrode 59.

  In addition, the holding member 62 has a curved surface having the same curvature as the outer peripheral surface of the stator 5 on the bottom surface thereof, and includes a protruding portion 67 that protrudes from the bottom surface and contacts the end surface of the stator 5. Can be positioned and fixed.

  In addition, since the shaft 8 is provided concentrically with the central hole of the stator 5 and drives the inner electrode 60 that contacts the conductor segment 24a and presses outward, all the welds 54 can be effectively energized. .

  In addition, this invention includes what can be implemented in the aspect which added various change, correction, improvement, etc. based on the knowledge of those skilled in the art. Further, it goes without saying that any of the embodiments to which the above-mentioned changes are added is included in the scope of the present invention without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Welding apparatus 2 Welding torch 5 Stator 8 Shaft 24a-24d Conductor segment 50 Electrode connection mechanism 54 Welding part 56 Rotating cam 59 Outer electrode 60 Inner electrode 62 Holding member 65 Cam groove 67 Protrusion part

Claims (4)

A welding torch (2) that welds the welded portion by rotating following the welded portion (54) formed by abutting the ends of the conductor segments (24a to 24d) arranged annularly on the end face of the stator (5). An electrode connection mechanism (50) that is provided in a welding apparatus (1) having a fixed arrangement of the stator,
A holding member (62) for positioning and fixing the stator;
An outer electrode (59) that contacts the conductor segment (24d) and presses inward to energize the weld;
An electrode connection mechanism for a welding apparatus, comprising: a rotating cam (56) for simultaneously driving the holding member and the outer electrode.   The electrode connection mechanism of the welding apparatus according to claim 1, wherein the rotary cam has a U-shaped cam groove (65).   The holding member has a curved surface having the same curvature as the outer peripheral surface of the stator on the bottom surface thereof, and further includes a projecting portion (67) that projects from the bottom surface and abuts against an end surface of the stator. Or the electrode connection mechanism of the welding apparatus of 2.   4. A shaft (8) for driving an inner electrode (60) that is provided concentrically with the central hole of the stator and contacts the conductor segment (24a) and presses outward. The electrode connection mechanism of the welding apparatus of any one of these.

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