JP2001129670A - Device for adjusting stroke of electrode in the welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for adjusting stroke of the electrode in the welding machine which prevents deformation of works and protects the electrode from damage by adjusting stroke of the electrode. SOLUTION: In the device for adjusting stroke of the electrode 5 which is attached at the tip of the electrode holding member 4 connected with the moving contact arm 1 which is driven by a motor, there is set a spring 11 between the top of the moving contact arm and the electrode holding member; there is also set at the electrode holding member an acceleration sensor to detect the contact of the electrode with works by the change of acceleration of the electrode holding member, or a position sensor to detect the same by the change of position of the electrode holding member against the moving contact arm. Through the action of sensor to control the motor, forward movement of the moving contact arm is suppressed, and as well as through the action of the spring, forwarding power of the electrode is absorbed, thus the contact of the electrode with works can be alleviated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling a stroke of an electrode for a welding machine attached to a tip of an electrode holding member connected to a movable arm driven by an electric motor.

[0002]

2. Description of the Related Art Conventionally, a movable arm driven by an electric motor is used.
An electrode holding member was directly connected to the tip of the system, and a welding machine electrode was attached to the tip of the electrode holding member. At the time of welding, the movable arm is driven by an electric motor, and the electrode on the movable arm side is rapidly brought into contact with the work to perform pressure welding.

[0003]

However, in the case of the above-mentioned conventional example, when an electrode comes into contact with the work due to the movement of the movable arm, an appropriate control device for the electrode stroke cannot be found, and therefore, there is a problem. There is a problem in that the electrode directly contacts the work with a strong force, and the work is deformed or the electrode is damaged.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to control a stroke amount of an electrode.
An object of the present invention is to provide an electrode stroke control device in a welding machine that prevents deformation of a work and prevents damage to an electrode.

[0005]

In order to achieve the above object, an electrode stroke control device in a welding machine according to the present invention comprises an electrode holding member and a movable arm arranged at the tip of a movable arm. A spring is arranged between the end of the electrode and an acceleration sensor for detecting the contact of the electrode with the work on the electrode holding member by a change in the acceleration of the electrode holding member, or an electrode for the movable arm. A position sensor for detecting a change in the position of the holding member is provided. The sensor controls the electric motor to suppress the advancement of the movable arm, and absorbs the advancement force of the electrode by the spring to work the electrode. It is characterized in that the contact with the contact is made a soft touch.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. In the figure, reference numeral 1 denotes a movable arm, which moves forward and backward by an electric motor (not shown). A screw 2 is screwed around the outer periphery of the distal end of the movable arm 1, and an adjusting nut 3 is screwed thereto.

Reference numeral 4 denotes an electrode holding member to which an electrode 5 is attached at the tip and a shunt holding member 7 to which a shunt 6 for supplying a welding current is connected at an intermediate portion. The rear end of the electrode holding member 4 is housed in the adjustment nut 3 and is fitted into a flange 8 locked by the adjustment nut 3 and a concave portion 9 formed at the tip of the movable arm 1. A protruding portion 10 is formed. A spring 11 is disposed in the concave portion 9 of the movable arm 1. The spring 11 is urged by a weak spring force so that the flange 8 of the electrode holding member 4 comes into contact with the adjustment nut 3. ing.

Therefore, the electrode holding member 4 is connected to the movable arm 1 by the adjusting nut 3 while maintaining the gap t. The gap t is adjusted by the adjusting nut 3 to about 5 mm to 10 mm corresponding to the output of the electric motor. Reference numeral 12 denotes a lock nut for locking the adjustment nut 3.

The electrode holding member 4 has a sensor
An acceleration sensor 13 for detecting the acceleration of the electrode holding member 4 is provided, and a signal from the acceleration sensor 13 is sent to an electric motor. And
As a sensor, a position sensor may be provided between the flange 8 of the electrode holding member 4 and the adjustment nut 3 on the movable arm 1 side instead of the acceleration sensor 13.

[0010] The electrode strobe in the welding machine as described above.
In the work control device, an electrode 5 is provided on one side of a work (not shown).
When the electric motor is driven in the state where is located, the movable arm 1 advances toward the work, and the electrode 5 on the movable arm 1 side quickly approaches and contacts the work. The forward force of the electrode 5 is absorbed by the spring 11 by the contact of the electrode 5 with the work, and the advance of the electrode 5 and the electrode holding member 4 is interrupted. Is detected by the acceleration sensor 13 or the position sensor immediately as a change in the acceleration of the electrode holding member 4 or as a change in the position between the electrode holding member 4 and the movable arm 1. The driving by the electric motor is suppressed by the signal from the sensor 13 or the position sensor, and the advance of the movable arm 1 is suppressed, and as a result, the contact of the electrode 5 with the work is a soft touch. By adjusting the gap t between the movable arm 1 and the electrode holding member 4 by the adjusting nut 3, optimal control corresponding to the output of the electric motor can be performed.

[0011]

According to the present invention, when the movable arm is advanced by driving the electric motor, the electrode comes into contact with the work, and at the same time, the advance force of the electrode is absorbed by the spring, and the acceleration sensor or the position sensor is immediately turned on. Operates to suppress the motor and the advance of the movable arm, so that the stroke amount of the electrode is controlled and the electrode comes into soft contact with the work. Thus, the deformation of the electrode can be prevented and the electrode can be prevented from being damaged.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a main part of an electrode stroke control device in a welding machine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable arm 4 Electrode holding member 5 Electrode 11 Spring 13 Acceleration sensor

Claims (1)

[Claims] An apparatus for controlling a stroke of an electrode attached to a tip of an electrode holding member connected to a movable arm driven by an electric motor, wherein the electrode is disposed at the tip of the movable arm. A spring is arranged between the holding member and the tip of the movable arm, and the electrode holding member is provided with an electrode.
An acceleration sensor that detects contact with the electrode by a change in the acceleration of the electrode holding member, or a position sensor that detects a change in the position of the electrode holding member relative to the movable arm
The electric motor is controlled by the sensor to suppress the advance of the movable arm, and the spring absorbs the advance force of the electrode to make the contact of the electrode with the work soft. An electrode stroke control device for a welding machine.