What are functions of elevator safety gear?

Elevator safety gear is the part of elevator, which is the safety protection device for protecting elevator runs safely. Elevator safety gear is operated by elevator overspeed governor, the function is that stops the elevator car and holds the elevator car at the elevator guide rail in an emergency when the running speed of elevator car exceeds the set speed by elevator overspeed governor, or elevator suspension rope is in broken or loose situation. Elevator safety gear provides effective protection for elevator running in safe; usually it is installed on the elevator car or counterweight frame.

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Types of Elevator safety gear

In accordance with the different structure of its brake components, elevator safety gear can be divided into wedge-shaped block, eccentric gear, and roller. According to stop distance, it can be divided into instantaneous safety gear and progressive safety gear.

More introduction of elevator safety gear, please review ElevatorVip’s official website: https://www.elevatorvip.com/

How to install and adjust Elevator Roller Guide Shoe?

Notes for installation of roller guide shoe in following:

 

1) Inspect installation situation of the guide rail, if there are some positional deviation at the step of rail or rail gauge, which should be adjusted before working.

 

2) Inspect interval of safety gear whether meets in the range of standard requirements, the interval between 2 blocks should not less than 2-3mm.

 

3) The bayonet of safety gear should be aligned with jaws center of roller guide shoe, the interval is between top plate of two slots and top of guide rail must not less than 5mm.

 

4) The roller of guide shoe should be perpendicular to the surface of guide rail, and the middle roller should be aligned with top surface of guide rail.

 

5) The maximum pressure of roller guide shoe should not exceed 25kg, and the pressure on each roller should not exceed 12.5kg, if the pressure could not be adjusted, then the car should be done the static balance and dynamic balance.

 

6) The residual oil should be cleaned after finished installation of roller guide shoe if there has, make sure there is no any oil on the surface of guide rail.

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.