JP3138570B2 - Electrode stroke control device in welding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding machine attached to a tip of an electrode holding member connected to a movable arm driven by an electric motor or a fluid cylinder or a fixed arm moved by an equalizing unit or the like. The present invention relates to a device for controlling a stroke of a working electrode.

[0002]

2. Description of the Related Art Conventionally, an electrode holding member is directly connected to a tip of a movable arm and a fixed arm driven by an electric motor or a fluid cylinder, and an electrode for a welding machine is attached to the tip of the electrode holding member. Was installed. At the time of welding, the movable arm is driven by an electric motor or a fluid cylinder, and the electrode on the movable arm is rapidly brought into contact with the work. Pressure welding is performed in a state of contact with the work.

[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. Further, the same problem arises on the fixed arm side because the electrode directly contacts the work with a sudden force.

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 is provided with an electrode holding member rotatably supported at the tip of an arm, A stopper is disposed from the arm toward the upper and lower surfaces of the electrode holding member, and the height of one stopper is adjustable, and a spring is disposed between the other stopper and the surface of the electrode holding member. An electrode touch sensor is placed on the electrode holding member, and when the electrode contacts the work,
The movement of the arm is suppressed by the touch sensor.
The spring absorbs the forward force of the electrode and absorbs the electrode power.
-It is characterized in that the contact with the hook is made a soft touch .

[0006]

In the electrode stroke control device for the welding machine constructed as described above, the arm is held in a state in which the electrode holding member is pressed by the spring and is in contact with one of the stoppers whose height can be adjusted. , The electrode holding member is moved to the work side, and the electrode at the tip is rapidly approached to the work and brought into contact therewith. The contact of the electrode with the workpiece causes the electrode holding member to rotate about the pivot portion until the surface of the electrode holding member contacts the other stopper. During this time, the advancing force of the electrode is absorbed by the spring, but the contact of the electrode with the work immediately changes the acceleration of the electrode holding member or the position of the electrode holding member with respect to the arm. , The movement of the arm is suppressed by the signal from the touch sensor, and the contact of the electrode with the work becomes a soft touch. By adjusting the height of the adjustable stopper, optimal control corresponding to the moving speed of the arm becomes possible.

[0007]

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 is moved back and forth by an electric motor or a fluid cylinder (not shown). An electrode holding member 2 is pivotally supported by a pin 3 at the tip of the movable arm 1. An electrode 4 is attached to the tip of the electrode holding member 2 so as to face the work 5.

A shunt 7 for supplying a welding current is attached to the rear end face 6 of the electrode holding member 2. A screw rod 8 is fixed to the lower part of the movable arm 1, and a nut 9 is screwed into the screw rod 8 to constitute one stopper 11 for the lower surface 10 of the electrode holding member 2. . Therefore, the height of the stopper 11 can be adjusted by the position of the nut 9.

Reference numeral 12 denotes another stopper fixed to the upper part of the movable arm 1 and constitutes a stopper for the upper surface 13 of the electrode holding member 2. A spring 14 is arranged between the stopper 12 and the upper surface 13 of the electrode holding member 2 so as to always press the upper surface 13 of the electrode holding member 2. Therefore, the lower surface 10 of the electrode holding member 2 is in contact with one stopper 11 as shown in the figure.

The electrode holding member 2 is provided with an acceleration sensor 15 for detecting the acceleration of the electrode holding member 2 as a touch sensor for an electrode, and a signal from the acceleration sensor 15 is provided by an electric motor or a motor. The fluid is sent to the cylinder. The touch sensor is replaced with the electrode holding member 2 instead of the acceleration sensor 15.
A position sensor may be provided between and the stopper 11.

The electrode strobe in the welding machine as described above.
In the work control device, as shown in the figure, the electrode holding member 2 is pressed by a spring 14, and the lower surface 10 of the electrode holding member 2 is brought into contact with one of the stoppers 11 whose height can be adjusted, and the work 5 When the electric motor or the fluid cylinder is driven in a state where the electrode 4 of the movable arm 1 is located on one side of the movable arm 1, the movable arm 1 advances toward the work 5, and the movable arm 1 is moved. The electrode 4 on one side quickly approaches and contacts the work 5. The contact of the electrode 4 with the work 5 causes the electrode holding member 2
Rotates around the shaft support 3 until the upper surface 13 of the electrode holding member 2 comes into contact with the other stopper 12. In the meantime, the forward force of the electrode 4 is absorbed by the spring 14, but the contact of the electrode 4 with the work 5 is immediately detected by the acceleration sensor 15 as a change in the acceleration of the electrode holding member 2. The driving of the arm 1 is suppressed by the signal from the acceleration sensor 15, and the contact of the electrode 4 with the work 5 becomes a soft touch. By adjusting the height of the adjustable stopper 11, optimal control corresponding to the moving speed of the arm 1 becomes possible.

In the above embodiment, a movable arm has been described as an arm, but the arm may be a fixed arm which is moved by an equalizing unit or the like. What is necessary is just to suppress an equalizing unit etc. by the signal from a sensor.

[0013]

According to the present invention, when the electrode comes into contact with the work by the arm, the electrode holding member rotates around the pivot, the forward force of the electrode is absorbed by the spring, and the touch sensor is immediately turned on. Operates to suppress the advance of the arm, so that the amount of stroke of the electrode is controlled and the electrode makes soft contact with the work. It is possible to prevent the damage of the electrode in advance.

[Brief description of the drawings]

FIG. 1 is a side 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 Arm 2 Electrode holding member 3 Shaft support pin 4 Electrode 11 One stopper 12 The other stopper 14 Spring 15 Touch sensor

Claims (1)

(57) [Claims] In an apparatus for controlling a stroke of an electrode attached to a tip of an electrode holding member connected to an arm, the electrode holding member is rotatably supported at the tip of the arm. A stopper is arranged from the arm toward the upper and lower surfaces of the electrode holding member, and the height of one stopper is adjustable, and a spring is arranged between the other stopper and the surface of the electrode holding member. Then, a touch sensor of the electrode is arranged on the electrode holding member, and when the electrode comes into contact with the work , the touch is performed.
The movement of the arm is suppressed by the
By absorbing the forward force of the electrode by pulling, to the electrode work
An electrode stroke control device for a welding machine, characterized in that the contact of the electrode is soft touch .