Monitoring apparatus for lifting machine

Abstract

The invention relates to a monitor for a hoisting machine, which comprises a rotary encoder for detecting displacement of the hoisting machine and outputting impulse signals corresponding to the displacement of the hoisting machine, a control unit for calculating speed of the hoisting machine by using the impulse signals received from the rotary encoder, and a mode selecting module for switching the control unit between a standard mode and an actual operational mode, wherein in the standard mode, the control unit records the calculated speed of the hoisting machine as standard speed, and in the actual operational mode, the control unit compares actual speed of the hoisting machine calculated at a preset position with the standard speed corresponding to the preset position, so that the control unit sends out stop signals to stop the hoisting machine when a difference value of the actual speed and the standard speed is larger than a first threshold value. The monitor has the advantages of simple structure, high precision and wide appliance range.

Description

technical field [0001] The invention relates to a monitor for a hoist, in particular to a monitor for a mine hoist. Background technique [0002] The hoist is used as the key equipment in the mine, mainly used for lifting ore, personnel, and materials. Once an accident occurs, it may cause casualties or serious damage to the equipment. Therefore, the safety requirements of the hoist are very high. [0003] In the prior art, the safety of the hoist is achieved by setting the main protection function in the main control system of the hoist. However, if the main protection function of the main control system of the hoist fails, the hoist is prone to accidents. Therefore, in addition to setting the main protection function in the main control system of the hoist, it is required to set up a safety monitor. [0004] For this reason, in the prior art, there have been various safety monitors for the hoist, such as wellbore switch monitors, electromechanical monitors, and the like....

AI Technical Summary

Problems solved by technology

The problem of using physical formulas to calculate the speed (relative to position) curve is the low protection accuracy. The main reason is that the actual speed curve of the hoist is affected by many factors, which is far from the calculation using theoretical formulas. For example, although theoretically The trip of the hoist is divided into various stages, but there may be a large error between the stage of the hoist actually running a trip and the stage of the theoretical division

For example, when the actual speed of the hoist does not exceed the standard speed preset value, the hoist may already be in a dangerous operating state, however, the monitor may not have a dangerous signal at this time, resulting in an accident

Images