JP3073967B2 - Electrode tip loosening device for spot welding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spot welding electrode tip loosening device used for removing an electrode tip from a spot welding electrode rod.

[0002]

2. Description of the Related Art When a tip attached to the tip of an electrode rod is damaged, it is necessary to replace the tip. To do so, the old chip must first be removed. Conventionally, to remove a tip that is tapered or screwed into the tip of an electrode rod, a wrench-like object is fitted into a notch provided in the cylindrical tip, and the electrode rod is attached to an attachment part such as a welding machine. On the other hand, it was slightly rotated and loosened before being removed.

[0003]

However, it is troublesome and time-consuming to fit a wrench-shaped object into a notch formed in a cylindrical chip, and to turn it by turning it.

[0004] It is an object of the present invention to make it easy and quick to loosen an electrode tip.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the feature of the present invention is that a rotating body 29 provided on the casing 5 side is attached to a mounting portion.
Has a chip insertion opening into which the electrode tip 40 is inserted.
The tip holding means is attached, and the tip holding means is
The rotating body 2 so as to be rotatable forward and backward by the moving means 1
9 are provided with a plurality of gears 32 supported by
A valley is formed by notching the portion, and the inscribed circle of the valley when the valley faces the center line MM is larger than the outer diameter of the electrode tip 40 and the valley of the gear 32. Become tooth
Part is the inscribed circle of the mountain portion is set smaller than the outer diameter of the electrode tip 40 when facing the center line M-M, the gears
32 so that the electrode tip 40 can be held by rotating itself .
Stop means for releasably stopping the rotating body 29 is provided, and the electrode tip 40 held between the gears 32 is
Rotating body 29 inserts chip by driving means 1 to loosen
It is provided rotatably about the center line MM of the mouth.
And the casing 5 removes the electrode tip 40.
In the moving direction by the moving means .

Therefore, the holding body (32) can be loosened while holding the spot welding electrode tip 40 by the driving means 1, and can be easily and quickly detached.

[0007] A tip holding means having a tip insertion opening into which the electrode tip 40 attached to the attachment portion is inserted is attached to a rotating body 29 provided on the casing 5 side. A plurality of holding bodies 32 supported by the rotating body 29 so as to be freely rotatable forward and backward, each holding body 32 has a cam structure, and a valley of each holding body 32 has the center line M The inscribed circle of the valley when facing toward −M is larger than the outer diameter of the electrode tip 40, and the inscribed circle of the valley when the ridge of each holding body 32 faces the center line MM. the circle is set smaller than the outer diameter of the electrode tip 40, moreover, the mountain portion continuous each valley or al
The stopper gradually increases in diameter and is provided with a stopping means for releasably stopping the rotating body 29 so that each of the holding bodies 32 can rotate and hold the electrode chip 40, and is held between the holding bodies 32. To loosen the electrode tip 40
The rotating body 29 is driven by the driving means 1 to move the center line M of the chip insertion port.
The casing 5 is provided so as to be rotatable around −M, and the casing 5 is moved by a moving means in a direction in which the electrode tip 40 is removed.

Further, it is possible to reliably clamped by a plurality of holding member 32 and the electrode tip 40 radially, by rotating the rotating body 29 can be removed by loosening the electrode tip 40 of Suputto welding.

The holding body 32 is formed of a gear, and the valley of each holding body (32) is preferably formed by cutting out a tooth portion. In such a case, the tooth portion is formed by spot welding electrode tip. The tip 40 can be bitten, so that the chip 40 can be securely held.

Further, the casing 5 is provided so as to be movable by the moving means in a direction in which the chip holding means holds the electrode chip 40 and is detached from the mounting portion. In such a case, the electrode tip 40 can be more easily and quickly removed.

It is preferable that a restoring means is provided for restoring the rotating body 29 to an initial rotational position in which the tip holding means sandwiches the electrode tip 40. In such a case, the rotating body is securely held. In addition, it is possible to automatically restore to a predetermined rotational position, and it is possible to improve work efficiency.

[0012]

1 to 8 show an embodiment of the present invention. A casing 5 is attached to a motor case 10 of a motor 1 as a driving means in a horizontal direction.

Upper and lower walls 5a, 5b at the tip of casing 5
Are provided with insertion holes 21 each having a center line MM as a center, and a housing 13 is formed at a tip end of the casing 5. The storage portion 13 has teeth 1 on its outer and inner circumferences.
An annular main wheel 15 having respective 6 and 17 is provided rotatably. That is, an annular ridge 18 is protruded from a lower portion of the main wheel 15, and the ridge 18 is rotatably fitted into a fitting recess 23 formed in the casing 5.

A disk-shaped lower support plate 25 having an insertion hole 19 which is concentric with and substantially the same diameter as the insertion hole 21 of the casing 5 is formed in the projection 18 of the main wheel 15.
Are rotatably fitted inside. In the lower support plate 25, a plurality (three in this embodiment) of support holes 26 are formed at regular intervals (at regular angular intervals).

In order to be located above the main wheel 15,
A disc-shaped upper support plate 2 having an insertion hole 28 concentric with and substantially the same diameter as the insertion hole 21 of the casing 5 at the center.
7 is rotatably fitted to the upper wall 5 a of the casing 5. The upper support plate 27 has a plurality of support holes 30 corresponding to the support holes 26. still,
The rotating body 2 is formed by the upper and lower support plates 25 and 27.
9 are configured.

Each of the support holes 26, 30 of the upper and lower support plates 25, 27 has a planetary gear 32 as a holding body.
Of the planetary gear 32 is meshed with the inner peripheral tooth 17 of the main wheel 15. Each of the planetary gears 32 has a cutout portion 35 formed by cutting out a part of the tooth portion 32a in a flat or curved shape.

Therefore, in the initial state in which the notch 35 of each planetary gear 32 faces the center line MM, each notch 35 becomes a valley (small diameter portion) and the inscribed circle of each valley forms a spot. A tip insertion hole having a diameter larger than that of the welding electrode tip 40 is formed, and the spot welding electrode tip 40 can be inserted. Moreover,
The inscribed circle when the peak of each planetary gear 32 (the large-diameter portion provided with the teeth 32a) faces the center line MM,
A tip insertion port having a diameter slightly smaller than the outer diameter of the electrode tip 40 is formed.

A plurality of (three in this embodiment) planetary gears 32 constitute chip holding means.

An intermediate gear 37 constituting an interlocking mechanism is interposed between the main wheel 15 and the drive gear 12 provided on the drive shaft 11 of the motor 1. The intermediate gear 37 has a vertical support shaft 45 fixed to the casing 5.
And is rotatably supported by the drive gear 12 and the outer peripheral teeth 16 of the main wheel 15.

The interlocking mechanism may have a configuration in which a pulley is provided on the motor 1 and the main wheel 15 and a timing belt is wound around both pulleys, and is not particularly limited.

On the periphery of the upper support plate 27,
A single or a plurality of notches 41 are formed as engagement means for a stopper for stopping the rotation of the upper support plate 27. The casing 5 includes:
A cylinder 43 as an operating means is mounted via a bracket 46, and a rod 4 as an engaging member is provided.
The tip of 3a is adapted to releasably engage with the notch 41.

The shaft portion 33 of the specific planetary gear 32 protrudes above the upper wall 5a of the casing 5, and the shaft portion 33 has a sensor fixed to the casing 5 by an appropriate bracket (not shown). A plate-like detection object 48 detected by 47 is fixed. Therefore, when the sensor 47 detects the detection target 48, the motor 1 is stopped, and the notch 41 of the upper support plate 27 is
And stops at a predetermined rotational position opposite to. Here, the notch 41 and the cylinder 43 constitute a stopping means, and the notch 41, the cylinder 43, the detected object 48 and the sensor 47 constitute a restoring means. Note that the stopping means and the restoring means are not limited to the above configuration.

In this embodiment, the electrode tip 4
In addition to the configuration in which the casing 5 is rotated and loosened while sandwiching it, a configuration in which the casing 5 is moved up and down is also provided.

That is, on both sides of the drive gear 12 fixed to the drive shaft 11 of the motor 1, a pair of intermediate gears 50,
A pair of raising and lowering gears 55 having a female screw portion 53 at the center are rotatably held on both sides of the casing 5 so as to mesh with the intermediate gears 50 and 51, respectively.

Then, the female screw portion 53 of each lifting gear 55
Is screwed with a threaded portion 58 formed on an upper and lower rod-shaped support body 57. The upper and lower portions of the support 57 are attached to a bracket 60 fixed to a fixed base. In addition, the moving means 62 for moving the casing 5 is constituted by each of the lifting gear 55 and the support body 57.

One embodiment of the present invention has the above-described configuration. Next, an example of use of such an apparatus will be described.

First, the valley 35 of the planetary gear 32 is aligned with the center line M
状態 The state facing the M direction is the initial state, and each valley 3
5 is larger than the outer diameter of the spot welding electrode tip 40.

Further, the rod 43a of the cylinder 43 is advanced, and the distal end of the rod 43a is engaged with the notch 41 of the upper support plate 27 at a predetermined rotation position. Therefore, the upper support plate 27 and the lower support plate 25 connected to the upper support plate 27 via the planetary gear 32 are not rotated (see FIGS. 6 and 7A).

In this state, the electrode tip 40 attached to the electrode rod for spot welding is inserted into the tip insertion slot, the motor 1 is operated to rotate the drive gear 12 forward, and the main wheel 37 is driven through the intermediate gear 37. 15 rotates, each planetary gear 32 meshing with the rotating main wheel 15
Rolls (rotates around the shaft 33).

When the planetary gear 32 rotates, the diameter of the tip insertion port is reduced. That is, since the planetary gears 32 in the initial state rotate, the tooth portions 32a of the respective planetary gears 32 bite into and fix the electrode tip 40 (see FIG. 7B).

Further, the rod 43a of the cylinder 43 is retracted so that the tip of the rod 43a is separated from the notch 41 of the upper support plate 27. As a result, the rotation of the upper and lower support plates 25 and 27 becomes free, and the upper and lower support plates 25 and 27 rotate together with the main wheel 15 to a predetermined angle, whereby the planetary gear 32 bites into the electrode chip 40 from three directions. , The electrode tip 40 can be loosened by turning.

The intermediate gears 50 and 51 for raising and lowering the casing 5 also rotate in conjunction with the intermediate gear 37 to rotate the pair of raising and lowering gears 55 on both sides. Since each of the lifting gears 55 is screwed to the fixed-side support member 57, the casing 5 is lowered and the loosened electrode tip 40
Can be reliably removed.

Further, when the motor 1 is rotated in the reverse direction,
The lower support plates 25, 27 rotate in the opposite direction. When the sensor 47 detects the detection target 48, the motor 1 stops to stop the upper and lower support plates 25 and 27 at predetermined positions.

Then, again, the rod 43a of the cylinder 43
And the front end thereof is engaged with the notch 41 of the upper support plate 27. Further, by removing the removed electrode tip 40 by rotating the motor 1 in the reverse direction, the planetary gear 32 can be returned to the initial state where the tip insertion port has a large diameter, and can be automatically removed.

The electrode tip 40 attached to the electrode rod for spot welding can be inserted into the tip insertion opening from below.
Is raised. In short, the moving means 62
Any configuration may be used as long as the tip holding means operates in the direction of holding the electrode tip 40 and moves the casing 5 in the direction in which the electrode tip 40 is removed. In addition, moving means 6
As a means for driving the second gear 2 in conjunction with the chip holding means, a structure in which each of the intermediate gears 50 and 51 is meshed with the intermediate gear 37 may be employed.

The upper and lower support plates 25, 27
To restore the cylinder to its initial position
The upper and lower support plates 25 and 27 may be rotated while sliding the third rod 43a on the peripheral surface of the upper support plate 27, and the motor 1 may be stopped when the rod 43a engages with the notch 41. In such a case, the notch 41 and the cylinder 43 constitute a restoring unit.

The engaged means constituting the restoring means and the stopping means is not limited to the notch 41 but may be a projection provided on the upper support plate 27 or a hole.
Moreover, these engaged means may be detected by a non-contact sensor, and the means is not particularly limited.

FIGS. 8 and 9 show another embodiment of the present invention, wherein the holding body has a cam structure. A cam surface 64 is formed by cutting out a part of the tooth portion 32b of the planetary gear 32, or a cam portion is formed separately from the tooth portion coaxially with the tooth portion (the tooth portion and the cam portion are integrally formed). May be formed). The valley 35a of the holding body 32 has a center line M─M.
The state facing the direction is the initial state, and each valley 35a
Is larger than the outer diameter of the spot welding electrode tip 40.

The mountain portion 35b which is continuous from the valley 35 a is,
The diameter gradually increases, and the electrode tip 40 is sandwiched between predetermined portions of each peak.

An engaging member 65 releasably engaged with the notch 41 of the upper support plate 27 is provided on the casing 5 side so as to be able to retreat and retreat. The engaging member 65 is an elastic member (coil) housed in the casing 5. The spring 66 is urged by a predetermined elastic force in a direction in which the notch 41 is engaged.
Note that the notch 41, the engaging member 65, and the elastic body 66 constitute a stopping unit and a restoring unit. Notch 41
Can be provided on the lower support plate 25 side.

In this embodiment, the pin body 32 is rotated (rotated), so that the spot welding electrode tip 40 is held by the cam surface 64 of the peak 35b with a predetermined force. Further, when a rotational force acts on the main wheel 15 (when a predetermined torque or more is applied to the main wheel 15), the notch 41 causes the engaging member 65 to retreat against the elastic body 66. The engagement with the engagement member 65 is released.

Therefore, with such a mechanism, the chip 40 can be securely loosened without excessive clamping force being applied to the chip when the chip 40 is loosened. When the upper and lower support plates 25 and 27 are rotated in opposite directions, the engaging member 65 slides on the peripheral surface of the upper support plate 27 and engages with the notch 41 by the elastic force of the elastic body 66. Then, the upper and lower support plates 25 and 27 can be restored to the initial state.

[0043]

According to the present invention than the structure described above, electric <br/> pole loosening of the chip can easily and quickly securely performed, it is possible to apply to the work by the robot. Also, there is no need to provide a notch for hooking a wrench or wrench on the chip.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic plan view including a partial cross section showing a configuration in which a casing interlocked with a tip holding means is moved up and down by the gear.

FIG. 3 is an overall schematic sectional view of the apparatus.

FIG. 4 is a plan view of the device including a partial cutaway.

FIG. 5 is an overall schematic side view of the apparatus.

FIG. 6 is a plan view showing a state in which the stopping means stops the rotating body.

FIG. 7A is a plan view of a state in which a valley of a holding body faces a central axis, and FIG. 7B is a plan view of a state in which a mountain of the holding body faces a center axis.

FIG. 8 shows another embodiment of the present invention, and is a plan view of a state in which a stopping means stops a rotating body.

FIG. 9 is a partial cross-sectional plan view showing a state where the holding body is rotated while holding the electrode tip.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drive means (motor), 5 ... Casing, 29 ... Rotating body, 32 ... Holding body (planetary gear), 40 ... Spot electrode chip, MM ... Center line of chip insertion port

Claims (3)

(57) [Claims] An electrode tip (4) attached to a mounting portion is attached to a rotating body (29) provided on a casing (5) side.
A chip holding means having a chip insertion opening into which the chip holder 0 is inserted is attached, and the chip holding means is supported by the rotating body (29) so as to be rotatable forward and backward by a driving means (1). A valley is formed by cutting out the teeth of each gear (32), and the inscribed circle of the valley when the valley faces the center line (MM) is provided. The outer diameter of the electrode tip (40) and the gear (32)
Is set smaller than the outer diameter of the electrode tip (40) when the tooth portion serving as the peak is directed to the center line (MM), and each gear (32) rotates on its own axis. A stop means for releasably stopping the rotating body (29) is provided so that the electrode tip (40) can be sandwiched so that the electrode tip (40) can be loosened. The rotating body (29) is provided rotatably about the center line (M-M) of the chip insertion port by the driving means (1), and the casing (5) is provided with the electrode chip (4).
An electrode tip loosening device for spot welding, wherein the device is moved by a moving means in a direction in which 0) is removed. 2. An electrode tip (4) attached to a mounting portion on a rotating body (29) provided on a casing (5) side.
A chip holding means having a chip insertion opening into which the chip holder 0 is inserted is attached, and the chip holding means is supported by the rotating body (29) so as to be rotatable forward and backward by a driving means (1). Each of the holding bodies (3) is provided with a holding body (32).
2) has a cam structure, and the inscribed circle of the valley when the valley of each holding body (32) faces the center line (MM) is determined from the outer diameter of the electrode tip (40). The inscribed circle of the ridge when it is large and the ridge of each holding body ( 32 ) faces the center line (M-M) is set smaller than the outer diameter of the electrode tip (40), and mountain portion continuous each valley or et al.,
The diameter of the rotating body (2) gradually increases, and the rotating body (2) is rotated so that each holding body ( 32 ) can rotate and hold the electrode tip (40).
Stop means for releasably stopping 9) is provided, and the electrode tip (4) held between the holding bodies ( 32 ) is provided.
The rotating body (29) is provided rotatably about the center line (M-M) of the chip insertion port by the driving means (1) so as to loosen the electrode chip (0). (40) An electrode tip loosening device for spot welding, wherein the device is moved by a moving means in a direction in which the (40) is removed. 3. The rotating body (29) is connected to each holding body (3).
The electrode tip loosening device for spot welding according to claim 1 or 2, further comprising a restoring means for restoring the initial position of the electrode tip (2) to sandwich the electrode tip (40).