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Safety device for elevator and rope slip detection method

A technology of safety devices and elevators, applied in the direction of transportation and packaging, elevators, etc., can solve problems such as time-consuming

Active Publication Date: 2012-07-18
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned conventional emergency stop device for an elevator, after the rope slip is detected, the governor rope is grasped, and the emergency stop operation is performed by descending the car, so it takes time until the car is stopped in an emergency.
In addition, depending on the weight balance between the car and the counterweight, the car may be pulled upwards. In this case, the conventional emergency stop device cannot cope with it, and the car stops in a state where the rope slips, and the emergency stop of the car still takes time.

Method used

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  • Safety device for elevator and rope slip detection method
  • Safety device for elevator and rope slip detection method
  • Safety device for elevator and rope slip detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] figure 1 It is a block diagram showing the elevator apparatus according to Embodiment 1 of the present invention. In the figure, the car 1 and the counterweight 2 are suspended in the hoistway by the main rope 3 as the suspension unit, and rely on the driving force of the traction machine 4 to move up and down in the hoistway. In the hoistway, a pair of car guide rails 9 ( figure 2 ); and a pair of counterweight guide rails (not shown) that guide the lifting of the counterweight 2.

[0020] The hoisting machine 4 has a driving sheave 5 around which the main rope 3 is wound, a hoisting machine motor 6 that rotates the driving sheave 5 , and a hoisting machine brake 7 that brakes the rotation of the driving sheave 5 . An emergency stop device (emergency stop device in the vertical direction) 8 is attached to the car 1, and holds the car guide rail 9 to make the car 1 come to an emergency stop. The emergency stop device 8 is electrically operated by an actuator, and ca...

Embodiment approach 2

[0054] under, Figure 5 It is a configuration diagram showing an elevator apparatus according to Embodiment 2 of the present invention. In Embodiment 1, the governor sheave 20 is provided with the car motion detector 23 , but in Embodiment 2, the reverse sheave 10 is provided with the car motion detector 24 . The car motion detector 24 generates a signal corresponding to the rotation of the return sheave 10 , that is, a signal corresponding to the movement of the car 1 . As the car motion detector 24, for example, an encoder, a resolver, a speed detection device, or the like can be used. The slip detection unit according to Embodiment 2 includes a drive sheave rotation detector 11 , a car motion detector 24 , and a slip detection circuit 30 .

[0055] Usually, there is almost no difference between the tension of the main rope 3 on one side of the reverse sheave 10 and the tension of the main rope 3 on the other side of the reverse sheave 10, so no slippage occurs between the...

Embodiment approach 3

[0058] under, Image 6 It is a configuration diagram showing an elevator apparatus according to Embodiment 3 of the present invention. In this example, a current sensor 25 is provided on the power supply cable of the hoisting machine motor 6 . The current sensor 25 generates a signal corresponding to the torque of the hoisting machine motor 6 . The slip detection circuit 30 determines slip between the drive sheave 5 and the main rope 3 based on the off signal of the relay 15 , that is, the brake operation command, the signal from the current sensor 25 , and the signal from the drive sheave rotation detector 11 .

[0059] Specifically, the movement of the drive sheave 5 , that is, the output from the drive sheave rotation detector 11 is considered when an off signal (brake operation command) of the relay 15 is output. When there is no slippage, the traction machine brake 7 applies braking to the inertia of the traction machine 4, the car 1, the counterweight 2 and the main ro...

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PUM

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Abstract

A safety device for an elevator, in which slip detection means detects a slip between a drive sheave and a main rope. An emergency stop device is mounted on an elevator car. The emergency stop device is electrically operated by an actuator and causes an emergency stop of the car independent of the direction of travel of the car, whether the upward direction or the downward direction.When the slipdetection means detects a slip between the drive sheave and the main rope, the emergency stop device interrupts electric power supply to a hoist motor and activates braking of the emergency stop device.

Description

technical field [0001] The present invention relates to a safety device for an elevator that detects slippage between a driving sheave and a main rope to stop a car, and an elevator rope slippage detection method that is applied to the safety device. Background technique [0002] In the conventional elevator emergency stop device, the output from the speed detection device for the main rope is compared with the output from the speed detection device for the driving sheave. The governor rope stop device inputs a command to hold the governor rope. When the governor rope is gripped by the governor rope stop device, an emergency stop operation is performed, and the car is emergency stopped (for example, refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent Laid-Open No. 2004-149231 [0004] In recent years, there has been an increasing demand for cars to stop quickly in emergency situations, such as measures to prevent passengers from being caught between la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B5/12
CPCB66B5/00
Inventor 木川弘丸山直之安藤英司
Owner MITSUBISHI ELECTRIC CORP