What Is a Safety Clamp?

Safety gear is a safety protection device for elevators. The elevator safety gear device is under the control of the speed limiter. When the speed of the elevator exceeds the speed limit set by the speed limiter of the elevator, or when the suspension rope breaks and slackens, the car is stopped and clamped on the guide rail. A safety device. It provides effective protection for the safe operation of the elevator. Generally, it is installed on the car frame or counterweight frame. Safety gears are divided into one-way safety gears and two-way safety gears, but due to the complicated manufacturing process, two-way safety gears have not been popularized in China.

The safety gear device is composed of a safety gear operating mechanism and a safety gear body. That is, when the safety gear mechanism is activated, first the electrical mechanism is touched to cause the elevator safety circuit to be disconnected to stop the elevator.

Elevator safety gear can be divided into block type,

Safety gear lever-speed limiter wire rope-tensioner-speed limiter-rope clamp, is guaranteed

The working principle of the safety gear is: the speed limiter is driven by the safety gear lever

Safety gear is the most important safety component in an elevator. Only by ensuring the safety and effectiveness of the safety gear can the safety of the elevator be guaranteed. It is worth noting that the components of the safety gear are not isolated bodies. Only when they are properly used with the speed limiter can they achieve their proper effect.

The safety gear device includes a safety gear body, a safety gear lifting linkage and an electrical safety contact. Safety gear can be divided into instantaneous and progressive safety gear according to structure and working principle.

When the instantaneous safety gear is in action, the kinetic energy and potential energy of the car are mainly deformed by the body of the safety gear and

1. There are sand, dust, sludge and other foreign objects in the jaws of the safety gear. The safety gear wedge blocks cannot clamp the rail guide, and the car continues to slide down, causing failure.
Treatment method: Remove the safety gear to clean up the foreign objects in the jaw.

2. Due to the wear of the wheel groove of the governor, the position of the governor wire rope is lowered, the rope clamp does not contact the steel rope or the braking force is insufficient, causing the governor steel rope to slip. Solution: Adjust the position of the speed limiter rope clamp and steel rope.

3. The structure size of the safety gear lifting mechanism is incorrect, the stroke of the lifting rod is not enough, and the lifting is not in place, so that the wedge cannot contact the working surface of the track, causing invalid action. Handling method: The structure of the lifting mechanism of different types of elevator safety gear is different, but most of them are crank rocker mechanisms. The effective stroke of the lifting rod can be changed by changing the structural size of the link mechanism.

4. The position of the speed limiter wire rope is not within the effective width of the rope clamp, so that the rope clamp cannot reach the speed limiter wire rope, causing failure.
Treatment method: If the relative position of the wheel groove of the speed limiter and the rope clamp is incorrect, you can adjust its relative position. If the installation position of the speed limiter is incorrect and the relative position of the wire rope and the rope clamp is incorrect, the position of the speed limiter can be adjusted. If the position of the rope is incorrect, adjust the position of the rope.

5. The braking force of the speed limiter rope clamp is not enough to clamp the speed limiter steel rope. When the governor moves, the governor steel rope slips in the groove of the governor and cannot lift the safety gear, causing failure. The "Elevator Manufacturing and Installation Safety Regulations" stipulates that when the speed limiter operates, the tensioning force of the speed limiter rope must not be less than the larger of the following two values: 300N or twice the force required for the safety gear device to function. The tensioning force here should be understood as the maximum braking force given to the governor rope by the friction of the wheel groove or the rope clamping device after the governor operates, that is, the governor rope is not in the governor. Minimum tension for slipping. This force is too small to lift the safety gear mechanism, but this force should not be too large to prevent it from being broken by exceeding the tensile strength of the wire rope.
Treatment method: Adjust the tension of the governor rope appropriately.

6. In the newly installed elevator, the speed limiter is installed in the wrong direction. When the elevator is running downwards, the speed limiter rope clamp cannot clamp the speed limiter steel rope. Conversely, when the elevator is running upwards, the rope clamp is reversed. Clamp the wire rope and cause failure. Solution: Reorient the speed limiter. ^[1]