Lifter overload protection device and fault diagnosis method

Abstract

The invention belongs to the technical field of engineering machinery, and particularly relates to a lifter overload protection device. The lifter overload protection device comprises a sensing hinge pin, a filtering circuit, an AD converting circuit, a central processing unit, a lifter operation state input part, a photocoupling circuit, a relay control output circuit, a sound-light alarm unit, a three-position nixie tube load display unit and a four-position nixie tube real-time AD value display unit. The invention further provides an automobile calibration method for the protection device, a sensing hinge pin fault diagnosis method, a method for avoiding the overload protection misoperation during operation, a gain adjusting method and a peeling method to guarantee that the protection device can normally, safely and accurately operate.

Description

technical field [0001] The invention belongs to the technical field of engineering machinery, in particular to an elevator overload protection device and a fault diagnosis method. Background technique [0002] In 2008, the state mandated that construction hoists on construction sites must be equipped with overload protection. At present, more than 80% of the accidents are caused by overloading and illegal operation. The overload protection detects the real-time load through the sensor pin. When the load exceeds 110% of the rated load, it stops the operation of the construction hoist by cutting off the output relay. It is an important guarantee for safe production on construction sites. [0003] Before existing overload protection devices are used in the field, initial calibration work must be carried out. The purpose of calibration is to enable the overload protection device to display the loading load of the cage. Generally, the calibration work has the following two proc...

AI Technical Summary

Problems solved by technology

[0006] (2) Sensing pin damage is more common

During the installation and use of the sensing pin shaft, due to brutal installation, the elastic body of the pin shaft cannot be restored, and the pin shaft cable is easily broken by falling objects from a height. There is a problem with the signal, the signal size fluctuates randomly, and the load data shows frequent jumps

At present, if the sensor pin supporting the overload protection device fails, it can only be determined by professionals by measuring the piezoelectric signal of the pin shaft, which is difficult for general field electricians to complete.

[0007] (3) The system parameters are disordered, and the overload protection device has failed to work

At this time, even if the normal working sensor pin is used, the load display error will occur

[0008] (4) The elevator is overloaded and prone to malfunction during operation

The lift is driven by rack and pinion. During the operation, the force of the pin shaft is relatively large, which may easily cause data jumps, resulting in unstable load display and detection, and even cause overload protection malfunctions.

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