JPH1058155A - Detecting device for member to be welded of welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detecting device for member to be welded of a welding machine capable of confirming presence/absence of a bolt supplied in simple construction in welding a bolt to a work. SOLUTION: The detecting device 1 of a welding machine M is constructed so as to include an upper electrode 2 and a lower electrode 3. An air passage 21 is formed in the upper electrode 2, a pressure sensor 5 is connected thereto. An electrode main body 31, an exchange electrode 32 and a guide pin 33 are included in the lower electrode 3, an air chamber 35 is formed integrally with the upper opening part 31a of an electrode main body 31 and a large diameter hole 32c of the exchange electrode 32, an air supply device 4 is connected to the air camber 35. The guide pin 33 consists of a body part 33a and a bottom part 33b, an air passage 33d is formed directing upward from the body part 33a so that the air passage 21 of the upper electrode 2 is roughly aligned to its axial center. When the bolt B is supplied, air in the air chamber 35 is not supplied to the air passage 21, when the bolt B is not supplied, air is supplied to the air passage 21, and the pressure sensor 5 is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an upper electrode and a lower electrode, a plate-like work is set on a guide pin provided on the lower electrode, and a welded member such as a bolt is set on the set work. More particularly, the present invention relates to a device for detecting a member to be welded of a welding machine that detects whether a bolt to be welded is supplied to a welding position.

[0002]

2. Description of the Related Art Conventionally, particularly in the automobile industry, many operations for welding bolts to a plate-like work have been performed. The operation of welding bolts to a work is generally performed in an automated system, and the bolts transported by the bolt supply device are supplied to the welding machine. The welding machine M1 is
As shown in FIG. 4, the lower electrode 43 includes an electrode body 44 and an electrode body 4.
The work W is placed on the replacement electrode 45 while being guided by the guide pins 46. Supported. The bolt B is supplied to the set work W, and the upper electrode 42 descends to press the electrode, thereby welding the bolt B to the work W.

[0003]

However, in the welding machine M1 arranged in the conventional automated system, the bolt B, which should be supplied from the bolt supply device 47, has a supply error due to some cause. If it is not supplied to the inside of the work W, welding will be performed without the bolt B, and a product defect will occur.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. By providing a welding device with a detection device capable of detecting the presence or absence of a bolt, it detects whether or not the bolt is supplied when welding the bolt to a work. An object of the present invention is to provide a device for detecting a member to be welded of a welding machine which can be formed simply and simply.

[0005]

Means for Solving the Problems A device for detecting a member to be welded of a welding machine according to the present invention is configured as follows in order to solve the above problems. In other words, the workpiece is provided with an upper electrode and a lower electrode, and the workpiece is welded to the workpiece supported by the lower electrode by pressing the workpiece by the upper electrode. A device for detecting a member to be welded of a welding machine, wherein the lower electrode is slidably disposed within the exchange electrode, the exchange electrode being disposed above the electrode body and supporting a work, and A guide pin having a concave portion for guiding a workpiece and for guiding a member to be welded, wherein an air chamber connected to an external air supply device is formed in the exchange electrode, and a lower portion of the guide pin is provided with the air. While being inserted into the room, an air passage is formed in the guide pin from the lower part to the upper part of the guide pin, and the upper electrode is formed in the upper electrode so as to coincide with the air passage of the guide pin. An air passage penetrating through the inside is formed, and an air detection device provided outside is connected to the air passage of the upper electrode. At the time of welding, the pressure of the air supplied from the air supply device causes the workpiece to be welded. It is characterized in that the presence or absence of a member can be detected.

Preferably, the upper portion of the air chamber is formed on a tapered surface, and the lower portion of the guide pin has a tapered portion engaging with the tapered surface.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

[0008] As shown in FIG. 1, a welded member detecting device (hereinafter, referred to as a detecting device) 1 of the welding machine M is a welding machine M.
And an air supply device 4 connected to the lower electrode 3 and a pressure sensor 5 connected to the upper electrode 2.

The upper electrode 2 is formed with an air passage 21 which is bent from the lower surface of the axis to the upper side of the axis and penetrates the outer peripheral surface. 23, and a commonly used pressure sensor 5 is connected. Pressure sensor 5
Is designed to send a signal to a controller (not shown) when a predetermined pressure is applied.

The lower electrode 3 has an exchange electrode 32 provided above the electrode body 31 and a guide pin 33 slidably provided inside the exchange electrode 32. Replacement electrode 3
2 is formed with a screw portion 32a that can be screwed to the main body electrode 31, and has a small-diameter hole 32b at the top so as to penetrate the axis;
A large-diameter hole 32c is formed in the lower part. A tapered surface 32d that extends downward is formed at a portion of the large-diameter hole 32c that contacts the small-diameter hole 32b. A guide pin 33 is fitted in the small-diameter hole 32b so as to be slidable in the up-down direction. Thus, the air chamber 35 is formed. An air passage 31b is formed from the opening 31a of the main electrode 31 toward the outer peripheral surface of the side of the main electrode 31. An air hose 37 is connected to a metal fitting 36 provided at an inlet of the air passage 31b. The supply device 4 is connected. The work W is supported on the upper surface of the main electrode 32.

The guide pin 33 includes a body 33a and a bottom 33.
The body portion 33a is fitted into the small-diameter hole 32b of the exchange electrode 32, and the bottom portion is inserted into the large-diameter hole 32c and has a tapered surface 33c that engages with the tapered surface 32d of the exchange electrode 32. Have been. Further, an air passage 33d is formed from the lower side surface of the body portion 33a to the axial center and upward from the axial center to the upper end surface. Air passage 33
d indicates that when the upper electrode 2 is brought into contact with the guide pin 33,
Formed at a position coinciding with the air passage 21 of the upper electrode 2,
The air supplied from the air passage 33d is supplied to the air passage 21 of the upper electrode 2.

A concave portion 33e is formed on the upper surface of the guide pin 33 so that the tip of the bolt B to be welded can be engaged. Guide the bolts B. And when the welding operation is not performed, the guide pin 33
The upper portion protrudes above the exchange electrode 32 by the pressure of the air, and the work W can be guided by being fitted into a hole formed in the work W.

Further, the bolts B are moved one by one to the bolt supply device 6 by a parts feeder (not shown) arranged separately from the welding machine M, and the bolts B are supplied between the upper electrode 2 and the lower electrode 3 by the bolt supply device 6. Supplied to

Next, the operation of the detecting device 1 of the welding machine M configured as described above will be described with reference to FIGS.

In the state shown in FIG. 1, the upper electrode 2 is in the upper position, and the bolt B is supplied between the upper electrode 2 and the lower electrode 3 by the bolt supply device 6. The work W is guided by the guide pins 33 of the lower electrode 3 and is supported by the exchange electrode 32. The air chamber 35 is filled with air supplied from the air supply device 4 and pushes up the guide pins 33 as shown in FIG. The entrance of the air passage 33 d formed in the guide pin 33 is provided in the small-diameter hole 3 of the exchange electrode 32.
2b, the tapered surface 32d of the exchange electrode 32 is closed by the tapered surface 33c of the guide pin 33, so that the air filled in the air chamber 35 leaks very little.

In this state, the upper electrode 2 descends toward the guide pin 33. At this time, as shown in FIG. 2, when the bolt B is supplied, the upper electrode 2 abuts on the upper part of the guide pin 33 while pressing the upper surface of the bolt B, and the guide pin 33 resists the pressure of air. And lower it. Guide pin 33
Moves downward in the exchange electrode 32, the guide pin 33
33d is communicated with the air chamber 35,
The air supplied to the air chamber 35 is supplied to the air passage 33d. However, the air is blocked by the bolt B and is not supplied to the air passage 21 of the upper electrode 2. Therefore, the pressure of the pressure sensor 5 is not detected.

On the other hand, simultaneously with the lowering of the upper electrode 2, a signal for welding preparation is output by a control device (not shown). Then, if the signal from the pressure sensor is not output even after the lapse of a predetermined time, the welding operation is performed as it is.

Next, when the bolt B is not supplied when the upper electrode 2 is lowered, as shown in FIG. 3, the upper electrode 2 directly presses the guide pin 33 to move it downward. When the guide pin 33 is moved downward, the air passage 33d formed in the guide pin 33 is communicated with the air chamber 35, and the air supplied to the air chamber 35 is supplied to the air passage 33d.
The air is supplied to the air passage 21 of the upper electrode 2, and is supplied to the pressure sensor 5 via the air hose 23. Since the pressure reaches a predetermined pressure, the pressure sensor 5 sends a signal to a controller (not shown).

On the other hand, in the control device which inputs the welding preparation signal output at the same time as the upper electrode 2 starts to descend,
Upon receiving a signal from the pressure sensor 5, a welding stop signal is output to stop welding.

Therefore, whether or not the bolt B is present on the guide pin 33 can be easily determined based on whether or not the air passes.

In this embodiment, a sealing for air leakage is not shown, but is naturally provided at a necessary portion, for example, the air chamber 35 or the air fittings 22 and 36.

Further, the detecting device for a welding machine according to the present embodiment is not limited to an automated welding machine, but can achieve the same effect in a manual welding machine.

[0023]

As described above, according to the present invention, a device for detecting a member to be welded of a welding machine comprises an upper electrode having an air passage formed therein, an air chamber, and a lower pin having a guide pin having an air passage formed therein. The workpiece is welded to the workpiece supported by the lower electrode by applying pressure to the workpiece by the upper electrode. And an air passage for the upper electrode;
The air passage of the upper electrode is formed so as to coincide with the air passage of the guide pin, an air detection device provided outside is connected to the air passage of the upper electrode, and an air supply device is connected to the air chamber of the lower electrode. I have. Then, at the time of welding, when the member to be welded is supplied, the air does not reach the air passage of the upper electrode by the member to be welded, and it is determined that there is a bolt,
When welding is performed and the member to be welded is not supplied, air passes through the air passage of the upper electrode, and further activates the pressure sensor to stop welding. Therefore, defective workpieces can be prevented with a simple structure.

Further, in a state where the guide pins are not welded, the guide pins are always arranged so as to protrude from the replacement electrode by the air pressure of the air chamber, so that not only the work can be reliably guided, but also parts can be saved. The bolt can be reliably moved to the welding position by the recess formed in the guide pin.

Further, since the upper portion of the air chamber and the lower portion of the guide pin are configured to be engaged with each other by a tapered surface, it is possible to prevent air from leaking in the air chamber, and to efficiently determine the presence or absence of parts. We can confirm and perform welding work.

[Brief description of the drawings]

FIG. 1 is a diagram showing a detection device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an operation of the detection device in a state where the bolt is supplied.

FIG. 3 is a diagram showing an operation of the detection device in a state where the bolt is not supplied.

FIG. 4 is a diagram showing the conventional detection device.

[Explanation of symbols]

 M ... Welding machine 1 ... Detector 2 ... Upper electrode 21 ... Air passage 3 ... Lower electrode 32 ... Exchange electrode 32d ... Tapered surface 33 ... Guide pin 33d ... Air passage 33c ... Tapered surface 33e ... Recess 35 ... Air chamber 4 ... Air Supply device 5: Pressure sensor B: Bolt (member to be welded) W: Work

Claims (2)

[Claims] An upper electrode and a lower electrode, wherein the workpiece is welded to the workpiece supported by the lower electrode by pressing the workpiece by the upper electrode. The lower electrode, the electrode body, an exchange electrode disposed on the upper part of the electrode body and supporting a work, and slidable in the exchange electrode. And a guide pin having a concave portion for guiding a workpiece and guiding the member to be welded, wherein an air chamber connected to an external air supply device is formed in the exchange electrode, A lower portion is inserted into the air chamber, and an air passage is formed in the guide pin from a lower portion to an upper portion of the guide pin, and the upper electrode matches the air passage of the guide pin. An air passage penetrating through the upper electrode is formed in the upper electrode, and an air detection device provided outside is connected to the air passage of the upper electrode, and the pressure of air supplied from the air supply device during welding is connected. A member detection device for a welding machine, capable of detecting the presence or absence of a member to be welded. 2. An apparatus for detecting a member to be welded in a welding machine, wherein an upper portion of the air chamber is formed on a tapered surface, and a lower portion of the guide pin has a tapered portion engaging with the tapered surface.