​What Is The Common Sense About Elevator Door Lock Circuit?

- Feb 17, 2021-

We all know that the composition of elevators is very complicated, and there are many safety components on elevators. Only by ensuring the normal operation of each component can the normal operation of the entire elevator be guaranteed. The door lock loop of the elevator is a very important link. Only when all the door lock circuits are all connected. The elevator can run safely. But I believe that many people don't know much about the door lock circuit of the elevator. Maybe they haven't even heard of it. Today I will introduce the basic knowledge of the elevator door lock circuit.


1. Function of elevator door lock loop

In order to ensure that the elevator can only operate after all doors are closed, door electrical interlock switches are installed on each hall door and car door. Only when all the door electrical interlock switches are all turned on, the door lock relay of the control panel can be closed and the elevator can run. Since most elevators cannot run in express and slow trains when the door lock is disconnected, although the door lock failure is easy to judge, it is difficult to find out which door failure is.

2. Composition of elevator door lock loop

The elevator door lock hook is a device that can close automatically. The door lock has a spring that can make the door lock hook press down. That is, it can automatically close without external force and keep the elevator hall door closed. Its function is to maintain this state to ensure that the elevator door is tightly closed, and to avoid the danger of the elevator door being easily opened. Also, after the elevator door lock is in place, the electrical switch on the door lock is turned on, so that the elevator can run normally.

3. Introduction to the benefits of elevator door locks

The electrical part is responsible for the control of the door lock circuit, which is divided into main lock and auxiliary lock to prevent the door lock circuit from failing and causing accidents. The mechanical part is responsible for the response of the door opener to prevent the function of opening the door without tools. Generally, the design and production must pass the type test of the authoritative department before it can be put into use.

We often see news reports that some elevators have malfunctioned, causing people in the elevators to be trapped, and some may even be trapped for several days. Especially for some people with confined space phobia, it is very dangerous. Because the elevator has been running uninterrupted, so I may have some minor faults. Then there are many reasons for failure. There are also many that require our special attention, so today's article will introduce you to the common faults of the elevator mechanical system that need attention.


1. Faults caused by natural wear

Mechanical parts will inevitably wear out during operation. New parts must be replaced when they are worn to a certain extent. Elevators must be repaired from time to time, and some vulnerable parts must be replaced in advance. If there is a failure, then update will be caused to passengers. Some economic losses.

2. Failure caused by mechanical fatigue

Certain mechanical parts are often subjected to stresses such as bending and shearing for a long time, which will cause mechanical fatigue and reduce mechanical strength and plasticity. Some parts are stressed beyond the strength limit and cause mechanical accidents or failures. For example, the steel wire rope is subjected to long-term tensile stress, bending stress, and abrasion. When it is more serious, the stress is uneven, which increases the stress of the remaining strands, causing a chain reaction, and finally all the ropes are broken, and a major accident may occur.

3. Failure caused by the lubrication system

The role of lubrication is to reduce friction and wear, extend the life of the machine, and also play a role in cooling, rust prevention, shock absorption and buffering. If the lubricating oil is too little, or it will be a lot of poor quality, it will cause overheating and burns of the mechanical parts, or it will be seized or damaged.

In order to ensure the normal operation of the elevator, this requires us to frequently check the contact parts of some switches of the elevator. If the power outage is very long, the relevant maintenance personnel should also be notified in time for emergency treatment. When dealing with it, it is necessary to find out the relevant reasons. If the elevator is not routinely maintained, the safety of the elevator must not be guaranteed. Therefore, some common elevator failures and related maintenance methods must be mastered.