Submerged arc welding controller

Abstract

The invention relates to a submerged arc welding controller, which comprises a singlechip, a welding voltage current isolation transformation conditioning circuit, a rectifying unit, a plurality of groups of isolated power supplies, a bus voltage detecting unit, a bus voltage regulating unit, a full-bridge pulse-width modulation (PWM) pulse width driving unit, an armature voltage and current sampling circuit and a motor excitation regulating unit. The singlechip is connected with the bus voltage regulating unit, the bus voltage detecting unit, the full-bridge PWM pulse width driving unit, the armature voltage and current sampling circuit, the motor excitation regulating unit and the welding voltage current isolation transformation conditioning circuit through power interfaces respectively, and the closed-loop control over the rotation speed and rotation direction of the motor is realized by detecting voltage and current signals, an excitation current signal and armature voltage and current signals and controlling the PWM pulse width driving unit. In the invention, a full-bridge driving technique is adopted, the anti-interference capacity is high, energy consumption braking can be realized, the impact is small, the torque output of a wire feeding machine is stable, and the communication function of the network is realized.

Description

technical field [0001] The invention relates to the technical field of wire feeding control for submerged arc welding, in particular to a wire feeding controller with network communication function controlled by a dsPIC 30F series single-chip microcomputer. Background technique [0002] At present, in submerged arc welded steel pipe manufacturing enterprises, 2-10 wire welding is required at the same time to improve the metal deposition rate and welding speed. The welding speed can reach more than 1.8m / min, and the single wire current can reach more than 1500A. The quality management department requires the ability to record and control welding parameters. Customers have almost strict requirements on welding quality, so they put forward higher requirements on welding equipment. [0003] Through the investigation, it is known that the existing wire feeding control technology is mainly based on the adjustable speed driver made of SCR power devices, and the direction is switc...

AI Technical Summary

Problems solved by technology

Generally, there is no energy consumption braking function, and it can only work in the I and "I quadrants, and the speed change rate is low.

The hardware is controlled by multiple circuit boards to complete the logic and simulation, the structure is complex, there are many faults, and the stability is poor

The production line is generally a welding system composed of multiple welding control boxes, and the operation is very complicated and unfriendly

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