Elevator safety circuit detection system

A safety loop, detection system technology, used in elevators, transportation and packaging, etc.

Active Publication Date: 2020-12-11
SHANGHAI MITSUBISHI ELEVATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, there is no technical solution to prevent electrical hazards and operational accident risks caused by accidental short-circuiting of the action contacts of the upper and lower stop devices and telescopic guardrails

Method used

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  • Elevator safety circuit detection system
  • Elevator safety circuit detection system
  • Elevator safety circuit detection system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The elevator safety loop detection system comprises an elevator safety loop, a controller, and an upper stop-stop detection switch 9;

[0066] The elevator safety loop includes an elevator automatic safety loop and an inspection safety loop;

[0067] An upper stop reset switch 3 is connected in series between the working power supply and the input end of the elevator automatic safety circuit;

[0068] An upper stop action switch 4 is connected in series between the working power supply and the input end of the maintenance safety circuit;

[0069] The upper stop action switch 4 is a normally open contact, which is installed next to the upper stop device. The upper stop device has two positions: a reset position and an effective position. When the car rises and the upper stop device is placed in the effective position , the state of upper stop action switch 4 becomes closed;

[0070] The upper stop reset switch 3 is opposite to the switching logic of the upper stop acti...

Embodiment 2

[0082] Based on the elevator safety loop detection system of Embodiment 1, when the input end of the elevator automatic safety loop is at a working high level, and the up-stop short-circuit detection point is at a detection high level, the controller outputs the up-stop reset switch 3 short Receive fault signal.

[0083] Preferably, when the input terminal of the automatic safety circuit of the elevator is at a working high level, and the up-stop short-circuit detection point is at a high level, the controller also controls to prohibit the operation of the automatic safety circuit of the elevator.

[0084] In the wells of buildings with civil construction features on the low roof, the upper stop device gives the maintenance personnel in the well an extra space to avoid danger, and protects the maintenance personnel operating in the well. After the maintenance personnel complete the maintenance operation, the upper stop device needs to be reset, and the elevator can only be all...

Embodiment 3

[0087] Based on the elevator safety loop detection system of Embodiment 2, if the processor receives the elevator automatic running state signal, and the elevator automatic safety loop input is at a working high level, and the up-stop short-circuit detection point is at a detection high level, Then output the upper stop detection switch 9 short-circuit fault alarm signal.

[0088] The elevator safety loop detection system of embodiment three, such as Figure 4 As shown, it is possible to carry out self-checking of the short-circuit failure of the upper stop-stop detection switch 9.

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PUM

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Abstract

The invention discloses an elevator safety circuit detection system. A pair of upper stop detection switches with the same switch logic as a normally open contact upper stop action switch is added atthe normally open contact upper stop action switch between a working power supply and the inlet end of an overhaul safety circuit. Whether the upper stop action switch is short-circuited or not is judged by monitoring combinational logic of the potential of an upper stop short-circuit detection point and the potential of the inlet end of the overhaul safety circuit, the electrical hidden danger caused by accidental short circuit of the upper stop action switch is eliminated, and the safety risk of operation of maintainers in a hoistway is reduced. Accidental short circuit detection of the upper stop action switch can be achieved only by simply modifying an original elevator safety circuit, modification of the original elevator safety circuit is extremely small, and a standard elevator canbe rapidly modified into an elevator with a short top layer function.

Description

technical field [0001] The invention relates to elevator safety technology, in particular to an elevator safety circuit detection system. Background technique [0002] With the development of cities, high-rise buildings are rising frequently, and the use of elevators is becoming more and more popular. Then there are more and more safety accidents caused by elevator equipment failure, so the functional safety of elevators has gradually been paid attention to. [0003] At present, the safety system of the elevator uses an electrical safety chain to realize safety control. The safety chain is a safety circuit formed by connecting a safety switch and a relay in series. If any safety switch is activated, the safety chain will be disconnected, thereby prohibiting Operation of drives and brakes (brakes remain locked). The safety switches in the above-mentioned safety chain are distributed in various positions of the elevator, some are in the machine room, such as the emergency st...

Claims

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Application Information

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IPC IPC(8): B66B5/00
CPCB66B5/00
Inventor 刘涛张磊刘文晋董德靖
Owner SHANGHAI MITSUBISHI ELEVATOR CO LTD
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