Elevator apparatus
First Claim
1. An elevator apparatus, comprising:
- a hoisting machine having a drive sheave and a hoisting machine brake for braking rotation of the drive sheave;
a main rope wound around the drive sheave;
a ascending/descending body suspended by the main rope to be raised and lowered by the hoisting machine; and
a brake control device for controlling the hoisting machine brake, wherein;
the brake control device has;
a first brake control portion for stopping the ascending/descending body as an emergency measure by operating the hoisting machine brake when an abnormality is detected;
a second brake control portion for reducing a braking force of the hoisting machine brake when a deceleration of the ascending/descending body becomes equal to or higher than a predetermined value during emergency braking operation of the hoisting machine brake; and
a third brake control portion for monitoring a slip speed of the main rope with respect to the drive sheave during emergency braking operation of the hoisting machine brake and reducing a braking force of the hoisting machine brake when the slip speed of the main rope becomes equal to or higher than a predetermined value; and
the second brake control portion and the third brake control portion control the hoisting machine brake independently of the first brake control portion.
1 Assignment
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Accused Products
Abstract
In an elevator apparatus, a brake control device has a first brake control portion, a second brake control portion, and a third brake control portion. The first brake control portion operates a hoisting machine brake to stop a ascending/descending body as an emergency measure when an abnormality is detected. The second brake control portion reduces a braking force of the hoisting machine brake when a deceleration of the ascending/descending body becomes equal to or higher than a predetermined value during an emergency braking operation of the hoisting machine brake. The third brake control portion monitors a slip speed of a main rope with respect to a drive sheave during emergency braking operation of the hoisting machine brake, and reduces a braking force of the hoisting machine brake when the slip speed of the main rope becomes equal to or higher than a predetermined value.
52 Citations
7 Claims
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1. An elevator apparatus, comprising:
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a hoisting machine having a drive sheave and a hoisting machine brake for braking rotation of the drive sheave; a main rope wound around the drive sheave; a ascending/descending body suspended by the main rope to be raised and lowered by the hoisting machine; and a brake control device for controlling the hoisting machine brake, wherein; the brake control device has; a first brake control portion for stopping the ascending/descending body as an emergency measure by operating the hoisting machine brake when an abnormality is detected; a second brake control portion for reducing a braking force of the hoisting machine brake when a deceleration of the ascending/descending body becomes equal to or higher than a predetermined value during emergency braking operation of the hoisting machine brake; and a third brake control portion for monitoring a slip speed of the main rope with respect to the drive sheave during emergency braking operation of the hoisting machine brake and reducing a braking force of the hoisting machine brake when the slip speed of the main rope becomes equal to or higher than a predetermined value; and the second brake control portion and the third brake control portion control the hoisting machine brake independently of the first brake control portion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification