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Elevator safety circuit

A technology of safety circuits and safety relays, applied in elevators, lifts, transportation and packaging in buildings, etc., can solve problems such as passenger injury, increased deceleration, and reduced passenger comfort.

Active Publication Date: 2015-01-21
SCHINDLER (CHINA) ELEVATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to this increase in the correlation coefficient of friction, when the brakes are applied in an emergency stop for elevators with synthetic traction devices, the deceleration of the car can be significantly increased, which seriously reduces the comfort of passengers and may even cause injury to passengers

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0021] The first elevator safety circuit 1 according to the present invention is figure 1 is shown in , where the power supply PS is connected to the input terminal T1 of the series chain of safety contacts S1-Sn. Contacts S1-Sn monitor the various states of the elevator and remain closed during normal operation. For example, contact S1 may be a landing door contact which will remain closed as long as that particular landing door is closed. If the landing door is opened without the elevator car arriving at that particular floor at the same time, which indicates a possible dangerous state, then the contact S1 will open and thereby cut off the safety chain 1 to initiate an emergency stop, which will be discussed further below Discuss in detail.

[0022] The driving relay 3 is connected between the output terminal T2 of the series chain of safety contacts S1-Sn and the common reference point 0V. The common reference point is hereinafter referred to as ground and is considered ...

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PUM

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Abstract

An alternative elevator safety circuit which can be used in a method to decelerate an elevator car during an emergency stop in a more controlled manner. The safety circuit comprises a series chain of safety contacts (S1-Sn) having an input (T1) connected to a power source (PS) and a first safety relay (7) deriving electrical power from an output (T2) of the series chain of safety contacts (S1-Sn). A delay circuit (13) is arranged between the output (T2) of the series chain of safety contacts (S1-Sn) and the first safety relay (7). Hence, if any of the safety contacts open to initiate an emergency stop, any process controlled by the operation of the first safety relay is delayed.

Description

technical field [0001] In elevator installations, the elevator car and the counterweight are usually supported on traction devices and connected to each other. The traction means is driven by means of joints with motor-driven traction sheaves to move the car and the counterweight in opposite directions along the elevator shaft. The drive unit including the motor, the associated brake and the traction sheave are usually located at the upper end of the elevator shaft or alternatively in the machine room directly above the shaft. Background technique [0002] The safety of the elevator is monitored and managed by means of a safety circuit or safety chain comprising a plurality of contacts or sensors. Such a system is disclosed in US 6,446,760. If during normal operation of the elevator one of the safety contacts opens or one of the safety sensors indicates an unsafe condition, the safety relay within the safety circuit transmits a signal to the elevator controller which instr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B1/32B66B5/02B66B13/22
CPCB66B13/22B66B1/32B66B5/02
Inventor 胡安·卡洛斯·阿贝德
Owner SCHINDLER (CHINA) ELEVATOR CO LTD