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Elevator Spare Parts and Elevator Knowledge: Safety Gear and Reducer

Elevator spare parts-safety gear is a kind of mechanical equipment that stops the car (or counterweight device) from moving. Passenger cars suspended by steel wire ropes or chains must be equipped with a safety gear. When there is a passage or space for people under the pit, the counterweight device also needs to be equipped with a safety gear. The safety gear is arranged on the lower beam of the car frame and acts together on the guide rail in pairs. The elevator spare parts-speed limiter is a device that restricts the speed of the car (or counterweight device). Generally, the equipment is in the machine room or on the top of the shaft. The tensioning equipment is placed in the pit.


The safety gear and the overspeed governor must work together in order to work.


1. Elevator spare parts: speed limiter


Elevator spare parts-speed limiter can be divided into two types according to its operating principle: the pendulum and the centrifugal.


The lower pendulum speed limiter of elevator spare parts uses the cam on the rope wheel to touch the roller at one end of the pendulum during the rotation process. The shake frequency of the pendulum is related to the speed of the rope wheel. When the vibration frequency of the pendulum exceeds a predetermined value, The pawl of the pendulum enters the stop pawl of the rope wheel, and then stops the overspeed governor. View more details about fire rated lift doors.


The speed limiter with the centrifugal structure can be divided into two types: the straight axis rolling type and the horizontal axis rolling type. Simple structure, high feasibility, and small space required for equipment are its characteristics.


When planning or selecting, pay attention to the following problems:


a.The operating speed of the elevator spare parts- speed limiter.

b.The pre-tensioning force of the elevator spare parts-overspeed governor rope.

c.The adhesion of the elevator spare parts-overspeed governor rope in the sheave or the tension of the overspeed governor when it is in motion.

d.The response time of the elevator spare parts-speed limiter should be as short as possible.


2. Instantaneous safety gear of elevator spare parts


The characteristics: the braking interval is short, and the car accepts severe shocks. There are several types: wedge-type instantaneous safety gear, eccentric block-type instantaneous safety gear, and roller-type instantaneous safety gear. Check more on  elevator parts.


3. Progressive safety gear of elevator spare parts


The characteristics are that it has elastic clamping type with far distance between stopping and is relatively stable.  

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