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Elevator device

A technology for elevators and monitoring devices, applied in transportation, packaging, elevators, etc., can solve problems such as broken ropes, inability to detect slow rope slippage, shortened rope life, etc.

Active Publication Date: 2013-04-17
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the conventional elevator protection device and safety brake device as described above, the slow rope slippage cannot be detected, and the life of the rope may be shortened or the rope may be broken due to the accumulated friction with the sheave.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0018] figure 1 It is a block diagram showing the elevator apparatus according to Embodiment 1 of the present invention. In the drawing, a hoisting machine 1 is provided above the hoistway. The traction machine 1 has a motor 2 , a traction sheave 3 rotated by the motor 2 , and a traction machine brake 4 that brakes the rotation of the traction sheave 3 . In this example, the traction sheave 3 is directly connected to the rotating shaft of the electric motor 2 and rotates together with the rotor of the electric motor 2 . During normal operation, the traction machine brake 4 maintains their stopped state (stationary hold) when the rotation of the motor 2 and the traction sheave 3 stops.

[0019] The hoisting machine 1 is provided with a first speed detector 5 that generates a signal corresponding to the rotational speed of the hoisting machine 1 , that is, the rotational speed of the traction sheave 3 . For the first speed detector 5, for example, an encoder (a traction machi...

Embodiment approach 2

[0045] under, Figure 4 It is a block diagram showing main parts of an elevator apparatus according to Embodiment 2 of the present invention. In Embodiment 2, the emergency stop operation command device 19 calculates the slip distance of the suspension body 7 relative to the traction sheave 3 as a slip degree value. And, when the slip distance of the suspension body 7 exceeds the first distance threshold (first threshold), the emergency stop operation instruction device 19 stops the car 8 at a predetermined floor through the traction machine 1 . Also, when the slip distance of the suspension body 7 exceeds a second distance threshold (second threshold) greater than the first distance threshold, the emergency stop operation command device 19 outputs an actuation signal to the emergency stop drive unit 11a.

[0046] In addition, the emergency stop operation command device 19 has a slippage distance calculation unit 23 and a slippage determination unit 21 . The slippage distanc...

Embodiment approach 3

[0064] under, Figure 6 It is a block diagram showing main parts of an elevator apparatus according to Embodiment 3 of the present invention. In Embodiment 3, the emergency stop operation command device 19 calculates the slip distance and slip speed of the suspension body 7 relative to the traction sheave 3 as the slip degree value. And, when the slip distance of the suspension body 7 exceeds the distance threshold (first threshold), the emergency stop operation instruction device 19 stops the car 8 at a predetermined floor via the traction machine 1 . Moreover, when the slippage speed of the suspension body 7 exceeds a speed threshold value (2nd threshold value), the emergency stop operation command device 19 outputs an operation signal to the emergency stop drive part 11a.

[0065] Here, the speed threshold is set to correspond to a degree of slippage greater than the distance threshold. That is, the speed threshold is set to be larger than the numerical value obtained by ...

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Abstract

In an elevator apparatus, a safety gear makes a car perform an emergency stop in response to an activating signal. A slippage monitoring apparatus computes a slippage extent value that is a value that relates to extent of slippage of a suspending body relative to a driving sheave based on the signals from first and second speed detectors. The slippage monitoring apparatus stops the car at a predetermined floor using a hoisting machine if the slippage extent value exceeds a first threshold value, and activates the safety gear using the activating signal if the slippage extent value exceeds a second threshold value.

Description

technical field [0001] The present invention relates to an elevator device which detects slippage of a suspension body relative to a traction sheave to stop a car. Background technique [0002] In conventional elevator protection devices, the slippage of the traction rope relative to the sheave is detected based on the rotation speed of the pulley that rotates with the movement of the car and the commanded travel speed of the speed command generator. , make the sheave emergency stop (for example, refer to Patent Document 1). [0003] In addition, in the conventional elevator safety braking device, when the car speed detected by the speed sensor exceeds a threshold value, the safety control device generates an activation signal. After a start signal is generated, the friction brake is pressed against the guide rail, and the car is braked (for example, refer to Patent Document 2). [0004] Patent Document 1: Japanese Patent Application Laid-Open No. 59-230981 [0005] Paten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B5/02
CPCB66B5/125B66B5/06B66B5/0037
Inventor 冈田大辅木川弘上田隆美丸山直之钉谷琢夫
Owner MITSUBISHI ELECTRIC CORP
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