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Elevator braking system

A technology for elevator braking and braking, which can be used in transportation and packaging, elevators, etc., and can solve problems such as unbalance and car impact.

Active Publication Date: 2008-09-10
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But in this existing elevator braking device, since the overspeed detection level set in the overspeed detection unit is only level 1, when the overspeed detection unit When the overspeed of the car is detected, the same braking force will be applied to the car through the same action even if the weight in the car and the moving direction of the car are different.
Therefore, for example, when the car is raised with many passengers in the car, an imbalance will occur between the car side and the counterweight side. When the brake device is working, it may bring a greater impact to the car

Method used

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no. 1 Embodiment approach

[0015] figure 1 It is a block diagram showing the elevator according to the first embodiment of the present invention. In the figure, in the hoistway 1, a car 2 guided by a car guide rail (not shown) for lifting and a counterweight 3 guided by a counterweight guide rail (not shown) for lifting are provided. A hoist (drive device) 4 for raising and lowering the car 2 and the counterweight 3 is provided in the lower part of the hoistway 1 . The hoist 4 has a hoist main body 5 including a motor, and a drive pulley 6 that is a pulley driven to rotate by the hoist main body 5 .

[0016] A plurality of main ropes 7 are wound around the drive pulley 6 . The car 2 and the counterweight 3 are suspended in the hoistway 1 by the main ropes 7 . And the car 2 and the counterweight 3 are raised and lowered by the rotation of the drive pulley 6 . That is, the drive pulley 6 rotates as the car 2 and the counterweight 3 move.

[0017] A braking device 8 for braking the rotation of the dri...

no. 2 Embodiment approach

[0047] Figure 4 It is a block diagram showing the braking system of the elevator according to the second embodiment of the present invention. In the figure, the hoist 4 is equipped with a braking device 41 for braking the rotation of the drive pulley 6 . The brake device 41 has first to fourth brake parts (a plurality of brake parts) 42 to 45 arranged at intervals in the rotation direction of the drive pulley 6 . The first to fourth brake parts 42 to 45 each have a brake shoe that is in contact with or separated from the drive pulley 6, an urging spring that urges the brake shoe in the direction of contact with the drive pulley 6, and an urging spring that energizes the brake shoe against the energizer. The applied force of the force spring makes the brake shoe leave the electromagnet of the drive pulley 6. And the first to fourth brake parts 42 to 45 respectively generate equal braking torques.

[0048] The braking device 41 performs first to fourth braking operations (a ...

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Abstract

A brake device is adapted to be able to perform different kinds of braking operation. An elevator car is braked by braking operation of the brake device. An emergency stop device for preventing the car from falling is mounted on the car. The emergency stop device is operated when the speed of the car reaches emergency stop overspeed. In a safety device are set overspeed levels according to positions of the cage, and the levels correspond to different braking operation and are lower than the emergency stop overspeed. When the speed of the car reaches each overspeed level, the safety device causes the brake device to perform braking operation corresponding to the level of overspeed at which the speed of the car has reached.

Description

technical field [0001] The present invention relates to an elevator braking system that performs a braking operation for stopping a car when overspeeding of the car is detected. Background technique [0002] In conventional elevators, there has been proposed a brake device that forcibly stops the car when overspeeding of the car is detected by an overspeed detection means. In the overspeed detection means, one overspeed detection level is set, and this overspeed detection level is set to a value higher than the normal speed level of the car. The overspeed detection level may vary continuously towards the end of the hoistway. If the speed of the car exceeds the overspeed detection level, the overspeed detection unit detects the overspeed of the car (see Patent Document 1). [0003] Patent Document 1: Japanese Patent Laid-Open No. 2004-123279 [0004] But in this existing elevator braking device, because the overspeed detection level that is set in the overspeed detection u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66B5/02B66B1/32B66B5/04B66B5/14
CPCB66B1/3492B66B5/04B66B5/06B66B5/18B66B5/02B66B1/32B66B5/14
Inventor 木川弘冈本健一上田隆美
Owner MITSUBISHI ELECTRIC CORP