Elevator safety system

Abstract

The invention discloses an elevator safety system. A safety evaluation unit is in communication with a lift car safety node through a first serial bus, is in communication with a control cabinet through a second serial bus, and is connected to an emergency electric operation device through a wire harness; the lift car safety node is connected to a car roof maintenance operation device through a wire harness; the lift car safety node receives a car top maintenance operation function signal, a car roof maintenance uplink confirmation signal and a car top maintenance downlink confirmation signalfrom the car roof maintenance operation device, and sends the car top maintenance operation function signal, the car roof maintenance uplink confirmation signal and the car top maintenance downlink confirmation signal to the safety evaluation unit through the first serial bus; and the emergency electric operation device is used for sending an emergency electric operation function signal, an emergency electric operation uplink confirmation signal and an emergency electric operation downlink confirmation signal to the safety evaluation unit. The elevator safety system is simple and clear in circuit, the number of contacts is reduced, the cost is reduced, meanwhile, the risk of faults is reduced, and the state of the contact of a switch or a button can be diagnosed.

Description

technical field [0001] The invention relates to elevator control technology, in particular to an elevator safety system. Background technique [0002] The standards prevailing in the elevator industry include: GB 7588-2003 and its No. 1 amendment, EN 81-20:2014. [0003] The elevator standard stipulates that the elevator must have: emergency electric operation (if necessary), car top inspection operation, pit inspection operation (specified in EN81-20:2014), inspection platform inspection operation (if necessary) and car inspection operation (if necessary) required) and other operating states. After entering the above running state, the elevator safety circuit will be disconnected and maintained until the corresponding running button is activated. [0004] For the relationship between emergency electric operation and various inspection operations, the elevator standard stipulates that the priority of inspection operation is higher than that of emergency electric operation,...

AI Technical Summary

Problems solved by technology

This safety system with a safety bus only involves the information collection of elevator safety devices and the disconnection of the safety loop, and does not involve the transmission of various operating states such as emergency electric operation and maintenance operation to the safety controller through the safety bus

At the same time, the safety system only informs the elevator driving and braking unit of the unsafe state, and the unit performs the safe braking operation of the elevator. No matter how the unsafe state is sent to the driving and braking unit of the elevator, there is a greater risk , the elevator may not brake safely

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