Missing step detection device for passenger conveyors

Abstract

The invention discloses a step deficiency detection device for a passenger conveying device. The step deficiency detection device is used for detecting whether step deficiency occurs on the steps of the passenger conveying device. The step deficiency detection device comprises a control device, a first sensor and a second sensor, wherein the first sensor and the second sensor are arranged in a driving station or a steering station; the two sensors are connected with the control device through signal lines respectively; when steps are detected by the sensors, the sensors output first signals; when step gaps are detected by the sensors, the sensors output second signals; when step deficiency does not occur, the first sensor and the second sensor detect step gaps at any different moments; when the first sensor and the second sensor output second signals at the same time, a judgment on step deficiency is made. The detection device is simple in structure and reliable to use. Sensor faults can be detected, and detection of step deficiency is realized accurately.

Description

technical field [0001] The invention relates to a detection device of a passenger conveying device, in particular to a step missing detection device of a passenger conveying device. Background technique [0002] The steps of the passenger conveyor are connected in a loop and move in a circle to transport passengers. Unwary occupants may fall into the mechanism and be seriously injured if: [0003] 1) After long-term operation, the parts that fix the steps are loose, causing the steps to break free from the step chain and fall into the inside of the truss; [0004] 2) One or more steps were removed during the inspection by maintenance workers and were not properly restored at the end of the inspection. [0005] Therefore, more and more attention has been paid to the reliability and safety of step missing detection of passenger conveying devices. In many years of practice, a variety of methods and devices for detecting missing steps have been proposed in the industry, aimin...

AI Technical Summary

Problems solved by technology

[0003] 1) After long-term operation, the parts that fix the steps are loose, causing the steps to break free from the step chain and fall into the inside of the truss;

[0004] 2) One or more rungs were removed during the overhaul by maintenance workers and were not properly restored at the end of the overhaul

However, when the sensor fails and continues to output the state of "detection of steps", the safety function will fail, and the passenger conveying device will be out of the protection of the safety function

[0007] China Patent No. 201020575087.2 is a device that compares the pulse of the step sensor with the expected frequency / period, which can detect the fault of missing steps in a stable operating state, but with the development of technology and the enhancement of energy conservation awareness, frequency conversion escalators Generally, it cannot be protected by this method during start-up and energy-saving low-speed operation (usually 20-30% of the rated speed), which will cause the safety function to enter the blind zone for a period of time, and there are certain potential safety hazards

The step detected by sensor A is marked as CA, and the step detected by sensor B is marked as CB. When CA and CB are missing at the same time, the safety function will lose its protective effect

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