Test fixtures for contactors

Abstract

The invention relates to a testing device for a contactor, comprising: a housing; an actuation module, mounted on the housing, and moving under the action of an external force; a transmission module, connected with the actuation module and a moving contact assembly of the contactor, and The movement of the actuating module is transmitted to the moving contact assembly; the sensor module is installed to the transmission module, and the displacement of the moving contact assembly and the reaction force of the moving contact assembly spring received by the moving contact assembly are measured through the transmission module. During the operation of the device, the actuating module moves under the action of external force, causing the transmission module to move, and then the moving contact assembly moves. When the moving contact assembly moves to a predetermined position, it stops moving, and then releases the external force. At this time, the moving contact The component will move under the action of the spring of the moving contact component. The reaction force of the spring of the moving contact component and the displacement of the moving contact component will be output through the transmission module through the sensor module. Through the displacement and reaction force of the moving contact component The size relationship determines the overtravel of the contactor.

Description

technical field [0001] The invention relates to a testing device for a contactor. Background technique [0002] The contactor is an electrical control component with large production volume and wide application range, which can be used to frequently switch AC and DC main circuits and large-capacity control circuits. Cooperating with relays can realize functions such as timing operation, interlock control, quantitative control, pressure application and undervoltage protection. The mechanical performance of the contactor (mainly refers to the contact overtravel) will directly affect its electrical life. For example, the overtravel of the main contact is insufficient due to excessive ablation. If it is not found in time, it is very likely to cause contact welding, and in severe cases, it will cause system damage. At present, the contactor can only be replaced passively when the contacts are welded or lack of phase failure during use, which poses a great hidden danger to the s...

AI Technical Summary

Problems solved by technology

For example, the overtravel of the main contact is insufficient due to excessive ablation. If it is not found in time, it is very likely to cause the contact to melt and weld, and in severe cases, the system will be damaged.

At present, the contactor can only be replaced passively when there is contact melting or lack of phase failure during use, which poses a great hidden danger to the safety of electrical lines and the personal safety of users

The existing contactor detection method is manual detection, and the detection equipment is an electric meter, which can only simply detect the on-off state of the contactor, and cannot accurately detect the contact ablation; if large-scale special equipment is used, the contactor needs to be removed. It takes a long time, labor costs are expensive, work efficiency is low, and labor intensity is high

[0003] One of the mechanical properties of the contactor is reflected in the overtravel of the contact. With the increase of the number of uses, the overtravel of the contact decreases continuously, and the pressure of the contact decreases accordingly. In severe cases, it will cause welding and burning of the contact , causing damage to equipment or even paralysis of electrical lines

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