Consumable part fault detection method in plasma arc spray gun

Abstract

The invention provides a consumable part fault detection method in a plasma arc spray gun. The method is characterized by continuously detecting at least one of the E-pole voltage of an arc-turning IGBT or the voltage of the low-voltage end of a high-voltage arc striking transformer in plasma arc spray gun operation; and determining that a consumable part in the plasma arc spray gun has a fault according to the quantitative density of detection voltages which are suddenly changed within a certain period of time. By using the method, the fault of the consumable part during the plasma arc spraygun operation can be timely detected, a machine can be stopped and a warning is sent out so as to avoid the further enlargement of the fault, production is not stopped because of the scrapping of thespray gun, economic losses are reduced and the decrease of processing quality, which is caused by the excessive loss of the consumable part, can be prevented.

Description

technical field [0001] The invention relates to the field of plasma arc and application technology, in particular to a method for detecting faults of consumable parts in a plasma arc spray gun. Background technique [0002] Consumable parts often fail in the operation of plasma arc spray gun. If there is no effective method for detecting the fault of consumable parts in plasma arc spray gun, the fault cannot be found in time and the shutdown will result in a decrease in the processing quality of the workpiece, which will further lead to the expansion of the fault , Even the spray gun body is scrapped, causing economic losses, increasing production costs, and production halts affecting production efficiency. Therefore, it is necessary to detect and discover the failure of consumable parts in time, and to shut down and warn. In addition, when using unmatched consumable parts by mistake, the failure phenomenon will also appear in advance. Therefore, a method for detecting the...

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Problems solved by technology

[0004] Defects of the method of "Fault Event Detection in Plasma Arc Spray Gun": the detection is easily interfered by high-intensity electromagnetic disturbance when the arc is transferred, and it is easy to make the detection protection allergic and affect the stability of the detection; the operating current is often controlled by a constant current feedback control circuit Control, the current has high stability and is not easy to fluctuate. If the operating current is used as the detection object, it is not easy to detect the failure of consumable parts; the operating voltage of the plasma arc spray gun is often called the arc voltage. There will be a high voltage of more than several thousand volts during arc ignition and arc rotation, and the signal sampling is dangerous. Even in normal operation, there are large voltage fluctuations, which is not conducive to the acquisition of fault characteristic signals.

[0006] Defects of the method of "System and Method for Detecting Nozzle and Electrode Loss": the stability of this method is difficult to guarantee

On the one hand, the electrode accessories have a certain dimensional tolerance, and the arc voltage of each accessory is also different; secondly, the surface of the workpiece to be processed is not necessarily flat, and the height between the arc spray gun and the workpiece will change continuously during operation, resulting in constant arc voltage. change; and, again, how are new and old accessories perceived to differ? How to fix it? There are great difficulties in practical

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