JP2000141050A - Exchanging structure of welding gun arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding gun arm exchanging structure which is inexpensive, facilitates handling, and further facilitates exchanging of a gun arm, unnecessitates alignment and which is capable of being used in an X type and a C type by preliminarily assembling a fixed arm and a movable arm to unite them and attaching the unit to a gun main body including a driving part to reduce costs and weight of a member to be exchanged. SOLUTION: In a welding gun consisting of an arm unit 1 into which a movable arm 2 and a fixed arm 3 are preliminarily assembled and a gun main body 5 which is provided with a movable arm driving actuator 6, a fixing part 10 fastening and fixing the arm unit to the gun main body and a holding part 11 holding the arm unit to the gun main body are provided on the nearly same line in the vertical direction in the rear of the arm unit, and a power feeding terminal which is connected to a power feeding terminal 17 of the gun main body is provided in a position nearly symmetrical to the same line between these fixing part and holding part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding gun in which a fixed arm and a movable arm each having an electrode at an end thereof are attached to a gun body, the welding being suitable for detaching the gun arm from the gun body. It relates to the arm exchange structure of the gun.

[0002]

2. Description of the Related Art Conventionally, in an X-type welding gun in which a fixed arm and a movable arm each having an electrode at an end thereof are attached to a gun body, a gun arm and an electric motor, a speed reducer, etc., which are its driving unit, are unitized. What has been made detachable from the gun body is known as disclosed in, for example, JP-A-9-57453. Also, in a C-type welding gun in which a fixed arm and a movable arm each having an electrode at an end thereof are attached to the gun body, the rear end of the fixed arm is detachable from the gun body. It is known as disclosed in Japanese Patent Application Laid-Open No. 9-220675.

[0003]

The known X
In the case of a mold welding gun, when the gun arm is replaced, the unit such as the electric motor and the reduction gear, which is the driving part of the gun arm, is detached from the gun body, which increases the cost and weight.
It is uneconomical and difficult to handle. In addition, the known C-type welding gun has a problem in that it is necessary to perform centering of both arms after exchanging the fixed arm, and this operation is not easy. Further, neither of the known welding guns can freely select and attach a desired type of X-type or C-type gun arm to the gun body.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to assemble a fixed arm and a movable arm in advance to form a unit. By attaching the unit to the gun body including the drive unit, the cost and weight of the replacement member are reduced, and the unit is inexpensive and easy to handle, and the gun arm can be easily replaced without the need for centering. An object of the present invention is to provide a welding gun arm exchange structure that can be used in common with a mold.

[0005]

In order to achieve the above object, an arm exchange structure for a welding gun according to the present invention comprises an arm unit in which a movable arm and a fixed arm are pre-assembled, and a movable arm. In a welding gun comprising a gun body provided with an actuator for driving an arm, a fixing portion for fastening the arm unit to the gun body and a holding portion for holding the arm unit to the gun body at a rear portion of the arm unit. And a power supply terminal connected to a power supply terminal of the gun body at a position substantially symmetrical with respect to the same line between the fixing portion and the holding portion. Is what you do.

In addition, a toggle clamp from the gun body side is applied to tighten and fix the arm unit and the gun body,
The arm unit is held in the gun body.
A pin provided on the gun unit side and a pin receiver provided on the gun body side.

Further, a bolt for connecting the arm unit and the gun body is used for fastening the arm unit and the gun body, so that the arm unit is held by the gun body. It is characterized in that the pin is provided.

[0008]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of an X-type welding gun provided with an arm exchange structure according to the present invention, FIG.
3 to 5 are explanatory views showing the order of attachment, FIG. 6 is a front view of a C-type welding gun having an arm exchange structure according to the present invention, and FIG. 7 is an arm exchange structure according to the present invention. And FIG. 8 is a front view of a C-type welding gun provided with an arm exchange structure shown in FIG.

1 and 2, reference numeral 1 denotes an arm unit of an X-type welding gun in which a movable arm 2 and a fixed arm 3 are assembled in advance by a shaft 4, and 5 is the movable arm. 2
This is a gun body provided with an actuator 6 for driving the motor and a welding transformer 7.

The movable arm 2 is provided with an electrode 8 at its tip, and its rear upper end is pivoted about the shaft 4 so that the electrode 8 can be swung substantially vertically with the shaft 4 as a fulcrum. . The fixed arm 3 has an electrode 9 at the tip thereof and is fixed to the shaft 4.

At the rear upper part of the fixed arm 4 which constitutes the rear part of the arm unit 1, a fixing part 10 composed of a pin for fastening and fixing the arm unit 1 to the gun body 5 is provided.
At the rear lower part of the fixed arm 4, there is provided a holding part 11 composed of a pin for holding the arm unit 1 to the gun body 5, and the fixing part 10 and the holding part 11 are vertically Are positioned substantially on the same line in the
Power supply terminals 13, 13 connected to the power supply terminals 12, 12 of the gun body 5 are provided at positions substantially symmetrical with respect to the same line between the power supply terminals 12 and 12.

At the rear lower part of the movable arm 2 constituting a part of the arm unit 1, a pin 15 provided at the tip of a pressure rod 14 which moves forward and backward by the actuator 6 can be engaged. The engaging groove 16 is formed.

Reference numeral 17 denotes a cooling water coupler for connecting the arm unit 1 to the gun body 5, and 18 denotes an arm unit 1
Guide pins for connection between the gun body 5 and 19, 19
This is a handle for gripping the system unit 1 or the welding gun.

On the upper surface of the welding transformer 7 of the gun body 5, there is arranged a toggle clamp 20 whose tip can be locked to the fixing portion 10 on the arm unit 1 side. On the front surface of the device, a holding receiving portion 21 having a groove capable of supporting the holding portion 11 on the arm unit 1 side is arranged. Reference numeral 22 denotes a servomotor for driving the actuator 6.

In the welding gun having the above-described configuration, the welding operation is performed in the state shown in FIG. 1, and when the welding operation is completed, the servo motor 22 is driven and the pressure rod 14 is actuated by the actuator 6. When the arm is retracted, the movable arm 2 swings around the shaft 4 and the movable arm 2 is opened so that the electrode 8 is separated from the electrode 9.

When the arm unit 1 is mounted on the gun body 5 as shown in FIG. 1, the holding portion 21 on the arm unit 1 side is held in the holding receiving portion 21 arranged on the gun body 5.
1 is securely held, and the fixed portion 10 on the arm unit 1 side is securely tightened and fixed by the toggle clamp 20 disposed on the gun body 5, and the fixed portion 10 and the holding portion 11 are substantially co-axial in the vertical direction. Since the power supply terminals 13 and 13 are located substantially symmetrically with respect to the same line between the fixing portion 10 and the holding portion 11, the toggle clamp 20
The clamping force acts equally on the power supply terminals 13, 13, and the power supply terminals 13, 13 are connected to the power supply terminals 1 of the gun body 5.
As in the case of Nos. 2 and 12, each of them is securely connected to enable accurate supply of welding current. Since the pin 15 on the pressure rod 14 is engaged with the engagement groove 16 on the movable arm 2, the movable arm 2 is reliably swung by the actuator 6.

When the gun arm is to be replaced due to a change in welding conditions or the like, the toggle clamp 20 is operated to release the locked state between the toggle clamp 20 and the fixing portion 10 and the handle 19 is held. When the rear part of the arm unit 1 is lifted diagonally upward, the arm unit 1 can be easily separated from the gun body 5.

Then, in order to attach the arm unit 1 having another gun arm to the gun body 5, the work may be performed in the order shown in FIGS.

That is, the arm unit 1 having another gun arm is placed near the front of the gun body 5 and the toggle clamp 2
0 is left open (the state shown in FIG. 3). Then, while lifting the rear part of the arm unit 1, the holding unit 11 on the arm unit 1 side is held by the holding receiving unit 21 on the gun body 5 side.
The engaging groove 16 on the movable arm 2 side is placed directly above the pressure rod 1.
4 are positioned directly above the pins 15 on the fourth side (the state shown in FIG. 4), and then the rear part of the arm unit 1 is slightly lowered so that the connection guide pins 18 between the arm unit 1 and the gun body 5 are connected.
After that, the toggle clamp 20 is operated to lock the toggle clamp 20 and the fixing portion 10 (the state shown in FIG. 5), and by further clamping operation of the toggle clamp 20, the arm unit 1 and the gun are moved. The main body 5 is integrated as shown in FIG.

FIG. 6 shows a C-type welding gun provided with an arm exchange structure according to the present invention. The gun body 5 has the same structure as that of the above-described embodiment, and the arm unit 1 is also substantially C-shaped. The fixed arm 3 and the movable arm 2 are assembled in advance, and the pin 1 on the pressure rod 14 side is also provided at the rear end of the movable arm 2.
5 are formed, and the other configuration is substantially the same as that of the above-described embodiment. Therefore, the same reference numerals are given and the description is omitted. As is apparent from this drawing, the X-type arm unit 1 as in the above-described embodiment and the C-type arm unit 1 as in this embodiment can be assembled to the gun body 5. .

FIG. 7 shows another embodiment of the X-type welding gun provided with the arm exchange structure according to the present invention, which is different from the first embodiment in that the holding portion 11 on the arm unit 1 side has a hole. It is composed of a perforated pin receiver, and has a fixing portion 1 on the arm unit 1 side.
0 is constituted by bolts, the holding and receiving portion 21 on the gun body 5 side is constituted by an upright pin, and a bolt receiver 30 is employed in place of the toggle clamp 20 on the gun body 5 side. However, since the other configurations have substantially the same configuration as the first embodiment, the same reference numerals are given and the description is omitted.

In this embodiment, in order to assemble the arm unit 1 to the gun body 5, first, as in the embodiment, the arm unit 1 is mounted.
The arm unit 1 is placed near the front of the gun body 5, and then, while lifting the rear part of the arm unit 1, the pin receiver, which is the holding unit 11 on the arm unit 1 side, is the holding receiver unit 21 on the gun body 5 side. The engaging groove 16 on the movable arm 2 side is located directly above the pin 15 on the pressure rod 14 side directly above the pin, and then the rear part of the arm unit 1 is slightly lowered so that the arm unit 1 After the connection guide pins 18 between the arm unit 1 and the gun body 5 are opposed to each other, a bolt, which is the fixing portion 10 on the arm unit 1 side, is screwed into a bolt receiver 30 on the gun body 5 side, and the arm unit 1 is fixed by the bolt. The gun body 5
And the arm unit 1 and the gun body 5 are integrated as shown in FIG.

When the arm unit 1 is to be replaced, first, the bolt which is the fixing portion 10 is removed from the bolt receiver 30 on the gun body 5 side, and then the arm unit 1 is replaced.
Lift the rear part of the arm unit 1 and hold it on the arm unit 1 side.
And the engaging groove 16 on the movable arm 2 side with the pressure rod 1.
After removing from the pins 15 on the four sides, the arm unit 1 is preferably separated from the gun body 5, and then another arm arm is provided.
The arm unit 1 having the arm may be assembled to the gun body 5 as described above.

FIG. 8 shows a C-type welding gun according to another embodiment having an arm exchange structure according to the present invention. The gun body 5 has the same configuration as that of the above-described X-type welding gun. The arm unit 1 also comprises a substantially C-shaped fixed arm 3 and a movable arm 2 assembled in advance, and the rear end of the movable arm 2 is also engaged with the pin 15 on the pressure rod 14 side. A mating engagement groove 16 is formed, and the remaining configuration is substantially the same as that of the above-described embodiment of the X-type welding gun. . As is clear from this drawing, the gun body 5 has an X as in the above embodiment.
The type arm unit 1 is also a C type arm unit as in this embodiment.
The system unit 1 can also be assembled.

[0025]

According to the arm exchange structure of the present invention, the arm unit in which the movable arm and the fixed arm are pre-assembled with the gun body is only held by the holding portion and tightened by the fixing portion. The fixing portion and the holding portion are provided on substantially the same line in the up-down direction, and the gun body is positioned substantially symmetrically with respect to the same line between the fixing portion and the holding portion. Since the power supply terminal connected to the power supply terminal is provided, the cost of the welding gun and the weight of the member to be replaced are reduced, and it is inexpensive, easy to handle, and has a gun arm.
The gun can be easily replaced and there is no need for centering. The gun body can be used for both X-type and C-type.
It becomes a system exchange structure.

In addition, a toggle clamp from the gun body side is applied to tighten and fix the arm unit and the gun body.
When the pin provided on the arm unit side and the pin receiver provided on the gun body side are configured to hold the arm unit on the gun body, the arm unit and the gun body can be easily and easily tightened and fixed, and the It is easy to hold the arm unit, and a useful welding gun arm exchange structure is provided.

Further, a bolt for interconnecting the arm unit and the gun body is applied for tightening and fixing the arm unit and the gun body, so that the arm unit is held by the gun body. Even when the pin is used, the arm unit and the gun body can be easily tightened and fixed, and the arm unit can be easily held by the gun body, thus providing a useful welding gun arm exchange structure.

[Brief description of the drawings]

FIG. 1 shows an X having an arm exchange structure according to the present invention.
It is a front view of a mold welding gun.

FIG. 2 is a plan view thereof.

FIG. 3 is an explanatory view according to the mounting order.

FIG. 4 is an explanatory view according to the order of attachment.

FIG. 5 is an explanatory view according to the order of attachment.

FIG. 6 shows a C having an arm exchange structure according to the present invention.
It is a front view of a mold welding gun.

FIG. 7 is a front view of another embodiment of the X-type welding gun provided with the arm exchange structure according to the present invention.

FIG. 8 is a front view of a C-type welding gun provided with the arm exchange structure shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arm unit 2 Movable arm 3 Fixed arm 5 Gun main body 6 Actuator 10 Fixing part 11 Holding part 12 Power supply terminal of gun body 13 Power supply terminal of arm unit 20 Toggle clamp

Continuing from the front page (72) Inventor Hiroshi Chikawa 1 Toyota Town, Toyota-shi, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Shigeru Umeda 4-2-237 Ogami, Ayase-shi, Kanagawa Ohara F Term (reference) 4E065 AA06 AA07 BA06

Claims (3)

[Claims] 1. A welding gun comprising an arm unit in which a movable arm and a fixed arm are pre-assembled, and a gun body having an actuator for driving the movable arm. A fixing portion for tightening and fixing the arm unit to the gun body and a holding portion for holding the arm unit to the gun body are provided substantially on the same line in the vertical direction, and the same line is provided between the fixing portion and the holding portion. An arm exchange structure for a welding gun, wherein a power supply terminal connected to a power supply terminal of the gun body is provided at a substantially symmetrical position with respect to the arm. 2. A toggle clamp from the gun body side is applied to tighten and fix the arm unit and the gun body.
2. The arm exchange structure for a welding gun according to claim 1, wherein a pin provided on the arm unit side and a pin receiver provided on the gun body side are configured to hold the arm unit on the gun body. 3. A pin receiver provided on the arm unit side and a gun body side, wherein a bolt for interconnecting the arm unit and the gun body is applied to tighten and fix the arm unit and the gun body. 2. The arm replacement structure for a welding gun according to claim 1, wherein said pin is provided.