Automatic detection and cut-off device for actuator internal faults

Abstract

The invention relates to the technical field of actuators, in particular to an automatic detecting and power off device of actuator inner failure. The device is composed of a detecting circuit, a logic judging circuit, a power off control circuit and a contact device which are connected to an actuator through a signal line in sequence, the contact device is connected between a manual detecting switch and the actuator, the detecting circuit is composed of a control signal detecting circuit and a position feedback signal detecting circuit, the control signal detecting circuit is composed of a separating device, a sampling resistor, a voltage divider, and a comparator which are connected to the actuator through a control signal line, and the power off control circuit is composed of a switch circuit and a time relay. The automatic detecting and power off device of actuator inner failure has the advantages that an actuator power source can be powered off automatically, so that the failed actuator is separated from production. When the power source is powered off, opening of various valves and dampers arranged on the actuator can be controlled manually. Serious harm to production caused by actuator failure can be avoided.

Description

technical field [0001] The invention relates to the technical field of actuators, in particular to an automatic detection and cut-off device for internal faults of actuators. Background technique [0002] Due to the internal failure of the actuator, for example, the quality of the internal components of the actuator is not up to standard, aging or a program error occurs during the program operation of the intelligent actuator, and the actuator will be out of control. [0003] Under this kind of fault, the control motor in the actuator will not be controlled by the input signal, but will rotate in one direction, that is, it will be fully closed uncontrolled, and will return to its original position after a short stay. In some production, this will cause large fluctuations in production indicators, seriously affecting equipment and personal safety. For example, in power plant production, it will cause the damper and water gate controlled by the actuator to close, causing the b...

AI Technical Summary

Problems solved by technology

However, none of these can fundamentally prevent the occurrence of such accidents.

[0006] After the fault of this kind of actuator is damaged due to internal reasons, it is not enough to rely only on replacing the new actuator, because after the fault, the swing of the faulty actuator that does not follow the instruction will sometimes cause serious damage and cause personal injury. Serious accidents involving injury or damage to production equipment

[0007] But at present, the actuator manufacturers have not proposed technical solutions for the special situation that the actuator does not act according to the instruction after the actuator is damaged.

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