CN202186817U - Elevator door lock safety return circuit - Google Patents

Abstract

The utility model discloses an elevator door lock safety return circuit, which comprises a safety device. The safety device is in series connection with a safe relay and further in series connection with door locks of each hall and a first door lock relay, and a series circuit of the hall door locks and the first door lock relay is further in parallel connection with a series circuit of a lift car door lock and a second door lock relay. The elevator door lock safety return circuit can not only meet maintenance requirements of elevator maintenance workers, but also avoid accidents caused by carelessness of the maintenance workers.

Description

A kind of door lock of elevator safety return circuit

Technical field

The utility model relates to a kind of door lock of elevator safety return circuit, belongs to the elevator technology field.

Background technology

Current, as shown in Figure 1 in many door lock of elevator vital circuits of usefulness.This circuit is to say that the series connection of car door lock, Room loop of the door lock do not make a detection signal, delivers to control loop, as one of necessary condition of operation.But when door lock relay J MS goes wrong, door lock will lose the protection of shearing, to such an extent as to produce the situation that elevator opens the door and moves.And elevator service personnel often needs the short circuit door switch elevator car door system being carried out fault inquiry, when maintenance, when finishing the work, because shorting stub is not pulled down in carelessness or because unforeseen circumstances causes the door lock short circuit, thereby stays accident potential.

The utility model content

The purpose of the utility model is, a kind of door lock of elevator safety return circuit is provided.It both can satisfy the maintenance needs of elevator service personnel, can prevent the accident that carelessness caused of service personnel again.

The technical scheme of the utility model: a kind of door lock of elevator safety return circuit; Be characterized in: comprise safety device; Safety device is connected with safety relay; Safety device is also connected with each Room door lock and the first door lock relay, also is parallel with the circuit series of the car door lock and the second door lock relay on the circuit series of the Room door lock and the first door lock relay.

In the aforesaid door lock of elevator safety return circuit, the said first door lock relay all links to each other with PLC or computer control board with the second door lock relay.

In the aforesaid door lock of elevator safety return circuit, said safety device comprises emergency stop switch, governor switch, security window switch, safety tongs switch and limit switch.

Compared with prior art, the condition distinguishing of closing of door lock, the detection that utilizes normally closed contact normally to move are carried out in the first door lock relay of the utility model utilization parallel connection and the normally closed electric shock of the second door lock relay.These contacts status input PLC or computer control board are judged whether disconnection fault of door lock safety return circuit through software.Being in the short circuit door lock still is mechanical breakdown or door lock relay fault etc.

Description of drawings

Fig. 1 is existing door lock of elevator vital circuit scheme drawing;

Fig. 2 is the structural representation of the utility model embodiment.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is further described, but not as the foundation to the utility model restriction.Embodiment.A kind of door lock of elevator safety return circuit; As shown in Figure 2; Safety device; Safety device is connected with safety relay, and safety device is also connected with each Room door lock (1KMT to nKMT) and the first door lock relay, also is parallel with the circuit series of the car door lock and the second door lock relay J MS2 on the circuit series of the Room door lock KMJ and the first door lock relay J MS1.The said first door lock relay all links to each other with PLC or computer control board with the second door lock relay.Said safety device comprises emergency stop switch JT0, governor switch JT1, security window switch JT2, safety tongs switch JT3 and limit switch JT4 etc.The condition distinguishing of closing of door lock, the detection that utilizes normally closed contact normally to move are carried out in the first door lock relay of the utility model utilization parallel connection and the normally closed electric shock of the second door lock relay.These contacts status input PLC or computer control board are judged whether disconnection fault of door lock safety return circuit through software.Being in the short circuit door lock still is mechanical breakdown or door lock relay fault etc.

Claims (3)

1. door lock of elevator safety return circuit; It is characterized in that: comprise safety device; Safety device is connected with safety relay; Safety device is also connected with each Room door lock and the first door lock relay, also is parallel with the circuit series of the car door lock and the second door lock relay on the circuit series of the Room door lock and the first door lock relay.

2. door lock of elevator safety return circuit according to claim 1 is characterized in that: the said first door lock relay all links to each other with PLC or computer control board with the second door lock relay.

3. door lock of elevator safety return circuit according to claim 1 is characterized in that: said safety device comprises emergency stop switch, governor switch, security window switch, safety tongs switch and limit switch.

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