What are the functions of the elevator inspection switch?

The inspection switch is used to switch between the normal operation of the elevator and the inspection state. When it goes to “check and repair” the elevator does not respond to incoming and outgoing calls and cannot travel at high speed. What are the functions of the elevator inspection switch? What should be noted when the elevator is overhauled? More information is needed on matters needing attention during the operation and use of the elevator.

What are the functions of the elevator inspection switch?

What are the functions of the elevator inspection switch?

  1. Pay attention to the inspection operation

If the elevator needs to run slowly during inspection, the number of people should not be less than two. Also pay attention to safety, especially when operating on the top of the car. When the cage roof is undergoing inspection and operation, it shall close all the doors of the outer hall before running slowly. When the elevator runs at a slow speed to a certain position, if the inspection of electrical and mechanical parts is needed, the inspection personnel should first cut off the emergency switch on the top of the car or the emergency button on the car’s control panel before the operation.

  1. Pay attention to the inspection operation in unsafe condition

If the elevator is out of control but the safety clamp is not working, the personnel inside the elevator should remain calm. In case of failure, the personnel in the elevator shall use all communication facilities to inform the related personnel. If an earthquake occurs, the elevator should immediately stop operating on the nearest floor. In case of fire, the elevator should be moved to the safe floor as soon as possible, and then the personnel inside the elevator should be evacuated safely. After all the personnel are evacuated, the power of the elevator should be cut off, and the doors of each floor should be closed. If the elevator is out of control, the emergency stop button should be pressed immediately, and the personnel inside the elevator cannot open the car door to jump out in case of danger.

Lecture on elevator parts and elevator knowledge Elevator Safety Gear & Reducer

Lecture on elevator parts and elevator knowledge

Lecture on elevator parts and elevator knowledge Elevator Safety Gear & Reducer

  • Elevator Safety Gear & Reducer

Elevator safety gear is a mechanical device, which stop the car (or counter-weight) from moving. Safety pliers are required for any manned car suspended by a wire rope or chain. When there is a passageway or space under the bottom pit, a safety clamp is also required for the weight. The safety clamp is set on the beam under the cage frame and ACTS in pairs on the guide rail at the same time.

A speed limiter is a device that limits the speed of a car (counter-weight), and usually installed in the machine room or at the top of the well. The tension device is placed in the bottom pit.

Safety gear and speed limiters must be combined to work.

 

  1. Elevator Speed limiter (Reducer)

Speed limiter can be divided into swing hammer type and centrifugal type according to its action principle.

Hem hammer speed limiter is to use the CAM on the rope wheel in contact with the roller at the end of the pendulum in the process of rotating, the frequency of the pendulum swings associated with rope wheel speed, when the vibration of the pendulum frequency exceeds a predetermined value, the pendulum of the ratchet into rope wheel stop stop claws, so that the speed limiter to stop running.

The speed limiter of centrifugal structure can be divided into vertical axis rotating type and horizontal axis rotating type. It is characterized by simple structure, high controllable ability and small space required for installation.

When designing or selecting, the following problems should be noted:

1). Speed limiter operating speed

2). Pretension force of speed limiter rope

3). Adhesion of the speed limiter rope to the rope wheel or the tension force of the speed limiter during operation

4). The response time of the limiter action should be as short as possible.

 

  1. Instantaneous safety gear

It features a short braking distance and a strong impact on the car.

Divided into several categories:

Wedge type instantaneous safety pliers

Eccentric block type instantaneous safety clamp

Roller type instantaneous safety pliers

 

  1. Progressive safety gear

It is characterized by elastic clamping of the clamping body, long stopping distance and stable car.