Safety door lock

Abstract

The invention discloses a safety door lock. The safety door lock comprises a door lock hook, wherein the door lock hook is arranged on one side of an opening and closing door plate. The safety door lock is characterized by further comprising a waterproof opening and closing box, a door lock tongue and a triggering device, wherein the waterproof opening and closing box is arranged on the other side of the opening and closing door plate, a static contact and a movable contact are arranged in the waterproof opening and closing box, the door lock tongue is buckled with the end of the door lock hook, the triggering device is used for closing or opening the static contact and the movable contact, the triggering device can be linked with the door lock hook, and a contact switch formed by the static contact and the movable contact is connected with other safety switches of an elevator in series in a safety control circuit of the elevator. According to the safety door lock, the movable contact and the static contact of the door lock switch are integrally arranged in the waterproof opening and closing box and can be forcibly disconnected, so that the requirements of safety contacts are satisfied, and the purposes of water prevention and dust prevention are achieved; the triggering device is arranged on the waterproof opening and closing box, so that the requirements of waterproof design of the switch are simplified, and the manufacturing cost of the switch is reduced; and the states of the movable contact and the static contact can be conveniently observed by virtue of a box cover of the opening and closing box, and whether the switch is normally operated is judged.

Description

technical field [0001] The invention relates to an elevator door lock structure, in particular to a safety door lock. Background technique [0002] Generally, in the elevator equipment with a door opening device, considering the safety requirements, the door lock switch is often provided with high electrical safety requirements, such as the requirements for safety contacts, that is, the contacts must be reliably disconnected. The action logic requirement is that the door lock switch is normally closed when the door is closed, and the door lock switch is turned off and must be turned off when the door is opened. For the integrated switch used in most occasions, it is either a normally closed contact but forced to open when compressed, or a normally open contact but cannot be forced to open after closing, it is difficult to meet the requirements of the safety contact of the door switch . Therefore, most of the door lock switches adopt the method of separating the switch cont...

AI Technical Summary

Problems solved by technology

However, in this structure, due to the separate arrangement of the two contacts, the contacts are often directly exposed to the outside, and are easily affected by water, dust, smoke, etc., and are prone to poor contact and open circuit

There are also a few door lock switches that integrate the two switch contacts inside the switch box, but in order to realize the positive disconnection of the two contacts inside the switch, it is necessary to design a complex mechanical linkage mechanism inside the switch. The volume of the switch is large and the structure is complex, and because the mechanical linkage structure of the switch is located inside the switch, it is difficult to directly check whether it is definitely disconnected and whether there is a lot of damage

At the same time, this kind of switch generally requires an external insert to be inserted into the switch to touch the mechanical linkage mechanism. It is difficult to carry out an effective waterproof design for the switch box, which often cannot meet the waterproof level requirements of the door lock switch.

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