Elevator emergency braking device

An emergency braking and elevator technology, which is applied in transportation, packaging, elevators, etc., can solve the problems of unstable braking force and wear of brake shoes, achieve sufficient braking performance, ensure braking performance, and improve the average friction coefficient Effect

Inactive Publication Date: 2016-07-13
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of high-speed elevators, the brake shoes are significantly worn, and it is difficult to ensure that the same brake shoe needs to be braked twice consecutively as stipulated by foreign standards.
In addition, since there are only 4 brake shoes in one section of the emergency braking device, the braking force becomes unstable due to surface pressure and wear.

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0055] Figure 4 It is a schematic diagram showing the two-stage emergency brake device according to the first embodiment of the present invention. In the first embodiment, the frame bodies 9 of the respective units are fastened to each other by fastening screws 34, and the figure 2 The illustrated emergency brake device units are stacked vertically to form a two-stage emergency brake device 33 . One end of the upper and lower brake shoes 1A, 1B is provided with a holding member 5 lifted by a driving device (not shown) for driving the emergency braking device 33, and the upper and lower brake shoes 1A, 1B are lifted approximately at the same time, thereby utilizing The wedge action clamps the guide rail 7. Thus, in the first embodiment, since two 1-stage emergency braking devices are provided, each 1-stage emergency braking device has a pair of brake shoes ( 4 brake shoes in total), so the braking force of 8 brake shoes can be obtained in total, which can effectively deal ...

no. 2 example

[0062] Figure 7 It is a schematic diagram showing the multi-stage emergency braking device 35 composed of three-stage emergency braking devices according to the second embodiment of the present invention. In the second embodiment, the three-stage brake shoes are an upper-stage brake shoe 100A, a middle-stage brake shoe 100B, and a lower-stage brake shoe 100C from top to bottom. In the second embodiment, speed energy is absorbed by a high initial friction coefficient, and in order to ensure two consecutive braking actions of the same brake shoe, it is configured as a multi-stage type that switches the actions of each brake shoe. Here, ceramics are used for the upper brake shoe 100A for the same reason as in the first embodiment, and cast iron-based materials are used for the middle brake shoe 100B and the lower brake shoe 100C.

[0063] exist Figure 7 Among them, the characteristic component is the middle brake shoe 100B, which is clamped into the guide rail relative to the...

no. 3 example

[0076] Figure 11 is a schematic diagram showing a third embodiment of the present invention.

[0077] Brake shoe 1E is a mixed material type brake shoe. Its sliding surface is made of metal material M such as cast iron that can obtain a high initial friction coefficient, and ceramic C with wear resistance and heat resistance is embedded in the sliding surface. . In the case of using a mixed material type brake shoe, the entire surface of the brake shoe made of a metal-based material M with a high friction coefficient slides on the guide rail at the moment when braking is started by a single-body brake shoe. Absorb speed energy, and in the subsequent braking, the ceramic C that has not been worn out ensures braking.

[0078] In the case of hybrid material type brake shoes, although it is not easy to meet the conditions of two consecutive braking of the same brake shoe stipulated by foreign standards, it can be applied to elevator specifications with low speed and light load....

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PUM

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Abstract

The purpose of the present invention is to ensure sufficient braking performance by generating a braking force in response to high speeds and large masses to be able to mitigate deceleration reaction time during braking. Moreover, in compliance with overseas standards, the purpose is to ensure two consecutive braking events using the same brake shoes. An emergency stop device for an elevator (6) that generates braking force by brake shoes (1) pressing a guide rail (7), disposed in an elevator shaft, and sliding thereupon in order to stop an elevator car (46), wherein the brake shoes (1) constitute a multistage structure, with each stage using a brake shoe (1) having different physical properties, and one stage comprises a brake shoe comprising a sliding face that is a stepped structure form, or having different slopes on the back face.

Description

technical field [0001] The invention relates to an emergency braking device for an elevator, in particular to an emergency braking device that can generate stable braking force even when used in a high-speed elevator. Background technique [0002] In existing elevators, as a safety device, an emergency braking device is provided, and when the elevator car descends at a speed above a constant speed, the emergency braking device stops the elevator car at an appropriate deceleration. [0003] When the descending speed of the elevator car reaches more than the prescribed speed, the brake shoes of the emergency braking device with two wedge-shaped (wedge) friction members are clamped into the guide rails arranged on the wall of the elevator passage, and the springs are used to press the guide rails. The guide rail generates a braking force using the elastic force generated by the elastic deformation of the spring, and the brake shoe is usually formed of a metal-based material suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B5/22
CPCB66B5/22
Inventor 大森贡坂井满佐藤五郎礒谷仁
Owner HITACHI LTD
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