Single cylinder dual-action type spot welding machine welding head

Abstract

The invention discloses a welding head for a double-acting spot welder with a single-cylinder, comprising a rails tie plate, a cylinder, an electrode tip holder, an electrode pole connected with the electrode tip holder, and electrode arranged at the electrode tip holder and a pressure replacement setting. The pressure replacement setting consists of a leader rocker die and a pinion-and-rack mechanism. A locating screw and the displacement control apparatus of a vernier regulation nut are arranged on the leader rocker die mechanism. The invention is able to correctly locate the distance of the electrodes and drive two electrodes at the same time. With the low cost needed, the invention is able to realize the precise location and the chucking power adjustment of the double-electrode of a resistance welder welding joint, which presents the coupling of variable electroslag welding with the welding joint of high cost performance, thereby leading a welding point to stable quality and preventing a work piece from deformation. The invention has simple structure. And the cost of processing components is low, which is easy to be operated.

Description

technical field [0001] The invention relates to a welding head of a spot welding machine, in particular to a welding head of a single-cylinder double-action spot welding machine. Background technique [0002] The spot welding machine is a device that applies pressure through the electrode after the weldment is assembled, and uses the resistance heat generated by the current to pass through the contact surface of the joint and the adjacent area to perform welding. This welding method is called resistance welding. Resistance welding has the characteristics of high production efficiency, low cost, material saving, and easy automatic control. Therefore, it is widely used in various industrial sectors such as aviation, aerospace, energy, electronics, automobiles, and light industry. One of the important welding processes. The welding quality of resistance welding is generally determined by the following three variables: (1) welding current or voltage, power; (2) welding time; (3...

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Problems solved by technology

[0005] 1. The disadvantage of manually moving the electrode (usually pedal type) to clamp the workpiece through a mechanical device is that the work efficiency is low, and the second is that the strength of the human device varies from person to person and from time to time, resulting in inconsistent clamping strength between electrodes. Thus making the welding quality unstable

[0006] 2. The general disadvantage of the welding head that uses the cylinder to drive the electrode is that the positioning of the clamped workpiece is not accurate enough: if one cylinder is used to drive one electrode and the other electrode is fixed to clamp the workpiece, when the welding part is heated and softened and deformed during welding, it is easy to Cause workpiece deformation, which is not allowed for many workpieces to be welded, such as the welding of high-power triode pins; if double cylinders are used to drive two electrodes separately, since the two cylinders are not easy to achieve the same action, it is easy to cause two The strength of each electrode is different, and the displacement distance is different, resulting in fluctuations in the quality of welding points and deformation of the workpiece.

[0007] 3. The main disadvantage of the welding head that uses the servo motor to drive the electrode is that it is expensive

Therefore, the clamping force between the two electrodes of the welding head that uses the servo motor to drive the electrode cannot be adjusted, that is, it cannot adapt to the change of the clamping force parameter when welding different workpieces.

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