JPH0346984A - Elevator sheave slip prevention device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an elevator control device, and particularly to a control device suitable for a rope-driven elevator.

[Conventional technology]

If the rider or counterweight is stuck and unable to move due to some kind of 1-rubble, the operation command is issued.
Abnormal friction occurs between the drive sheave of the hoist and the rope, causing abnormal wear on the drive sheave and the rope, and in the worst case, there is a risk that the rope may break.

On the other hand, the conventional device is
As in Publication No. 65, a device for detecting the difference in rotational speed was installed between the driving sheave and the deflecting sheave in order to detect slippage between the rope and the driving sheave, but the structure was complicated and it was not easy to install. It was not a device that could be used.

[Problem to be solved by the invention]

The above-mentioned conventional technology has a complicated structure and cannot be easily installed.In particular, it does not take into consideration the point of adding it to an elevator that is already in operation, and there is a problem that it cannot be solved at low cost and in a short period of time.

[Means to solve the problem]

In order to achieve the above object, the present invention does not directly detect rope slip, but indirectly detects sheave slippage by detecting elevator operation command information and elevator movement status. It was designed to do so.

[Effect]

When the position detecting device mounted on the car crosses the position detecting shield plate mounted on each floor, the output signal of this position detecting device turns on and off.

When the elevator is stopped, the output signal of this position detector is off because it intersects with the shield plate, and when an operation command is issued to the elevator, the car moves, so the shield plate is removed. The output signal is turned on. Changes in this signal change over a fixed period of time as the elevator car moves, so if the signal from this position detection device does not change even after the time set in advance by the timer has elapsed, a command is issued to the elevator to operate. Despite this, it is determined that the car is not moving, and the elevator is stopped.
To prevent abnormal wear between the drive sheave and the rope.

[Example] Hereinafter, the present invention will be explained in detail using an example shown in the drawings. FIG. 2 is a schematic diagram of an elevator equipped with a position detection device for each floor. 1 is the rail, 2 is the car, 3 is the platform,
Reference numeral 4 denotes a position detector 55 which is a baffle plate that drives the position detector.

FIG. 1 shows an embodiment of the invention. 4b is the contact of the position detector shown in Fig. 2, 10 is the driving relay coil, IQal,
10az is its make contact, 11 is a relay coil for car movement detection, and 1iar.

11az is its make contact, 4b is the break contact of the position detector 4 shown in Fig. 2, T is the timer, TL is its on-delay contact, 12 is a relay coil for detecting sheave slipping, 12a
13a is the make contact of the ascending operation command relay (not shown), 14a is the make contact of the descending operation command relay (not shown), and these are the operating power supplies P and N.
are connected as shown in the figure.

Next, the operation will be explained.

Now, a description will be given of a state in which an operation command is issued while the elevator car is stopped at the landing level.

As shown in FIG. 2, the positional relationship between the position detector 4 mounted on the car and the drive baffle plate 5 mounted in the tower is such that the position detector 4 and the drive baffle plate 5 intersect. The break contact 4b, which is the output signal thereof, is in an open state.

When the ascending operation command is issued, the ascending operation command relay contact 13a is turned on, and the operation relay 10 is turned on by the circuit P-13a-12a-10-N. The sheave slip detection relay contact 12a is closed because the stop command relay 12 is turned on by the P-Ti-12N circuit.

When the driving relay 10 is turned on, its make contact 10a is turned on.
x and 10az are also turned on, respectively, and P-10az-T
-N circuit causes timer T to start counting the time limit. When the elevator is operated normally, the first and second seats leave the hall 3, and the position detector 4 and drive baffle plate 5 are released from the crossed state, so the break contact 4b, which is the output signal of the position detector 4, is , close. As a result, the car movement detection relay 11 is turned on by the circuit P-4b-11-H and self-maintained by the circuit P-10az-11st-11-N. When a predetermined time period elapses after the operation command is issued, the timer T operates and its contact Tb becomes open. The time limit set for the timer T is set to the time limit for which the position detector 4 is no longer crossed with the drive baffle plate 5 during normal operation, plus an appropriate margin time, so the timer contact Tb opens. Even if this happens, the sheave slip detection relay 12 is turned on by the circuit P-11a-12-N, and the elevator is operated normally.

Now, if a driving command is issued while the rider or counterweight is stuck and unable to move due to some trouble, the position detector 4 and drive baffle plate 5 will continue to maintain the crossed state. Contact 4b of position detector 4 remains open. Therefore, the car movement detection relay 11 cannot be turned on, and its contact 11a cannot be turned on, and the sheave idle rotation detection relay 12 is P Tb 12
It turns on only in N circuits. When a driving command is issued and a certain period of time has elapsed, the timer 'r operates and its contact Tb
is opened, and all the closing circuits of the sheave slip detection relay 12 are opened, so the relay is turned off, the contact 12a of the circuit of the operation relay 1o is opened, the operation relay 10 is also turned off, and the elevator is stopped. -Dan,
The stopped elevator has a separate exit (not shown), forming a circuit that cannot be restarted.

〔Effect of the invention〕

According to the present invention, abnormal wear of the sheave and rope due to sheave idling can be prevented in advance.

Safety will be improved.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of an elevator equipped with a position detection device for each floor.

Claims (1)

[Claims] 1. A position detector for detecting the position of each floor in a hoisting elevator that suspends a car from one end of a rope and a counterweight from the other end and is operated by a drive sheave of a hoisting machine. and a timer set to a predetermined time limit, which counts the time limit after an elevator start command is issued. If the position detector does not operate even after the predetermined time limit of the timer has elapsed, the elevator is stopped. A sheave slip prevention device for an elevator, characterized in that it is provided with a means for preventing.