At present, due to the great variety of elevators, their use, drive, traction, and control methods, failures of various elevators are often not exactly the same. Periodically inspect and maintain the used elevators, eliminate the hidden troubles before they occur, take specific measures to eliminate them, and adjust the elevator's various faults. When used, combined with the specific conditions of the elevator, adopt correct and practical safety procedures, and quickly and effectively eliminate hidden troubles of various elevators so as to ensure safe and normal operation of the elevator. The following elevator maintenance company tells you: elevator maintenance safety and technical points.
Elevator maintenance safety and technical points
Safety points:
1. When many people cooperate with the maintenance of elevators, they must concentrate their minds on each other.
2. If you want to open the hall door with a triangular key, be sure to see the position of the car. Do not take for granted that the elevator must be in any position.
3. When opening the hall door into the car roof, it is not possible to immediately close the door. First, place the inspection switch on the service station, press the emergency stop switch, turn on the car ceiling light, and then close the hall door after the car top station has stabilized.
4. When the top of the car is out, first the hall door must be opened, then the car top inspection switch, emergency stop switch and lighting switch should be reset one by one, and then the hall door should be closed after reaching the hall. (If the person stands outside the hall and can operate the above switch, the switch should be reset after standing outside the hall)
5. When the car is running, don't stick your body out of the bar. Do not work on a ride.
6. In the car roof, in the event that the elevator runs out of control, it must be kept calm. It should be able to grasp the things that can help and keep it in a safe place. It cannot attempt to open the door and jump out.
7. When working in the pit, the safety switch of the pit maintenance box should be cut off. When you climb out of the pit, make sure that the hall door is open before you can access the pit's safety circuit and then quickly climb out of the pit. (If the safety switch can be operated outside the hall, the safety switch should be turned on after the person climbs out of the pit and then closes again)
8. If you must short-circuit the door lock to check the elevator door lock failure, you must ensure that the elevator is in maintenance state. After checking, be sure to disconnect the door lock short cable before returning the elevator to its normal state.
9. When overhauling emergency lifts, when using emergency switches, be sure to keep the doors closed and prevent others from falling into the hoistway. When entering the pit, if the door of the first floor is to be opened, a warning sign or special person's care must be taken outside the hall door to effectively prevent others from falling into the pit.
10. When it is necessary to cut off the power supply to overhaul the elevator, hang up the warning sign “Someone operates and prohibits closing”. When carrying out belt operation or using electric tools, it is necessary to do a good job of preventing electric shock.
Technical points
First, the door lock circuit
effect:
In order to ensure that the elevator can only operate after all doors are closed, a door electric interlock switch is installed on each hall door and car door. Only when all the electrical interlock switches of the door are fully connected, the door lock relay of the control panel can only pull in and the elevator can run.
Fault status:
When all the doors are closed, the state of the door lock relay is observed on the control panel. If the door lock relay is in the release state, the door lock circuit should be judged to be off.
Maintenance method:
Since most elevators cannot run at night when the door lock is disconnected, it is difficult to find out which door is faulty because the door lock fault is easy to judge.
Second, the safety circuit
effect:
To ensure that the elevator can operate safely, many elevators are equipped with safety components. Only when each safety component is in normal condition, the elevator can run, otherwise the elevator will immediately stop running.
The so-called safety loop is to install a safety switch in all safety components of the elevator, connect all safety switches in series, and control a safety relay. Only when all the safety switches are switched on, the safety relay is pulled in and the elevator can be operated electrically.
l. Common safety circuit switches include:
Room: Control panel emergency stop switch, phase sequence relay, thermal relay, speed limiter switch
Well: Upper limit switch, lower limit switch (some elevators put these two switches in the safety circuit, while others use these two switches to directly control the power supply)
Ground pit: broken rope protection switch, pit maintenance box emergency stop switch, buffer switch
Car: Control Box Emergency Stop Switch
Car top: safety window switch, safety gear switch, car top repair box emergency stop switch
Third, maintenance advice:
1. First, it is important to doubt whether the door lock of the elevator stop is faulty.
2. Ask if there is a triangular key to open the landing door and use the triangle key to re-open the hall door outside the hall.
3. Make sure that in the inspection state, the control panel separates the shortroom door lock and the hall door lock, and it is determined whether the hall door part or the car door part is faulty.
4. If the hall door is partially faulty, ensure that under the overhaul condition, the short-circuit hall locks the loop, run the elevator at the inspection speed, and check the contact status of each hall door by layer (don't forget the passive door).
Note: After repairing the door lock loop fault, it is necessary to remove the door lock short cable first to restore the elevator to the express train state.
In addition, at present, although many elevators have a normal door lock circuit and the door lock relays are also engaged, they usually take a normally open contact on the door lock relay and send it to the PC (or PC) for detection. If the door lock relay itself contacts, Bad, it will also cause the status of the door lock circuit failure.
Summary: The relevant information about elevator maintenance safety and technical points was introduced here for everyone. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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