Elevator Safety Devices and Elevators

Abstract

The invention discloses an elevator safety device. When the braking force increases due to reasons such as a decrease in speed, and the braking force exceeds a set value, the first elastic body can be moved backward through a feedback device, thereby reducing the impact on the braking body. The pressure of the guide rail can automatically control the size of the braking force to generate a suitable braking force. The braking force can be continuously adjusted within a large range. Even if the friction coefficient increases due to the decrease of the speed during the braking process, the braking force can still be automatically adjusted. Keep it at the specified value to keep the braking deceleration roughly constant, reduce the impact on passengers, reduce the risk of accidental injury to passengers, greatly reduce the maximum force on the elevator car components, and avoid damage to the car and counterweight components. The elevator safety device has a compact and simple structure, can continuously adjust the braking force within a wide range, automatically maintain the braking force at a specified value, and keep the braking deceleration roughly constant. The invention also discloses an elevator comprising the elevator safety device.

Description

technical field [0001] The invention relates to elevator control technology, in particular to an elevator safety device and an elevator. Background technique [0002] When the elevator overspeeds due to an accident, the elevator safety device brakes the car or the counterweight. In the Chinese national standard for elevators, the average deceleration of the car or counterweight with the rated load is required to be 0.2g to 1.0g when braking. But we know that the braking force of the safety device is not constant, and the braking force is related to the friction coefficient and positive pressure. Generally, the progressive safety device applies positive pressure to the brake element through the elastic element, and the friction between the brake element and the guide rail produces a braking force, but the friction coefficient is related to the speed. Generally speaking, as the speed decreases, the friction coefficient increases. Therefore, during the braking process of the c...

AI Technical Summary

Problems solved by technology

Excessive deceleration will not only bring discomfort to passengers, even accidental injury, but also bring difficulties to the design of safety devices. To ensure safety, car components and safety devices must be designed according to the maximum force, so that This makes the design of the elevator cumbersome and costly. At the same time, the relationship between the average deceleration and the maximum deceleration must be considered when initially adjusting the set braking force to meet the requirements of the national standard for the average deceleration. This gives the designer It has brought great difficulties. It is necessary to find a suitable setting method through a large number of experiments, which requires a lot of manpower and material resources.

[0003] In the existing safety device technology, the elastic body presses the brake body to slide on the guide rail to generate braking force, the positive pressure on the brake body is constant, but the friction coefficient changes due to the change of the speed of the car or counterweight , the braking force can only change with the

Or a complex method must be used for adjustment, such as an adjustment method disclosed in Chinese patent CN01139661.X, which adopts a hydraulic control method and has a complicated structure

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