JP2930807B2 - Elevator control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an elevator brake device when it is broken.

[0002]

2. Description of the Related Art A conventional car braking function of an elevator will be described with reference to FIG.

In an elevator, a device for mechanically holding the stopped state of the car 1 has a brake mechanism (brake device).
There are two. This is an important device for safety, and it is one of the basic conditions for an elevator to reliably perform a braking operation.

[0004] The elevator is connected to a counterweight 5 via a wire rope 4 around which the car 1 is wound around a hoisting sheave 3, and an electric motor 6 rotates the hoisting sheave 3 so that the electric motor 6 rotates between the hoisting sheave and the wire rope. The hoisting and rewinding of the wire rope 4 is performed by the frictional force, and the raising and lowering operation of the car 1 is performed.

Therefore, when the car 1 is stopped or the power is released, there is no driving torque of the electric motor 6 and the car 1 is mechanically driven.
Requires the brake device 2 to stop.

The brake device 2 comprises an electric motor 6 and a hoisting sheave 3
A brake shoe 8 made of a material having a high coefficient of friction is applied to a coupling 7 (also used as a brake drum, hereinafter referred to as a brake drum) with a force of a brake spring 9 to obtain a braking force. This braking force is stipulated in the regulations and must be large enough to brake a load handling load equivalent to 150% or more of the rated load capacity of the elevator, and a function to release this braking force is required.

The above-mentioned braking force release mechanism generally employs a method in which an electromagnetic solenoid 10 is used to generate an electromagnetic force that overcomes the force of the brake springs 9 and 9 to forcibly release the brake.

Conventionally, it has been determined that the braking force has been lost, that is, the brake has been released, based on the electromagnetic force generation command (brake release command), and a car running command has been output to the electric motor.

[0009]

However, in the case where the braking force is lost (braking release) without generation of electromagnetic force, that is, despite the fact that the electromagnetic solenoid does not operate, the brake mechanism is mechanically damaged. However, in such a case, since no drive command is issued to the electric motor, the motor is in a free state, and the car starts free-falling in a heavy direction due to the weight difference between the car and the counterweight.

When the car side is heavy and the car 1 falls freely, the situation is almost the same as that of wire rope cutting. In such a case, an overspeed detection mechanism is provided for the safety of passengers in the car.
That is, the governor device operates, and a safety device (not shown) provided on the car operates to mechanically stop the car. Conversely, when the counterweight is in a free-fall state, the safety device does not operate.

As described above, when the safety device cannot be stopped, that is, when the speed at which the governor device is operated is not reached, or when the car falls freely in the ascending direction, the safety device is provided in the elevator pit (the lowest floor). Is a space provided below for safety, and its size and the like are also specified by laws and regulations.) The method of softening is common.

If the speed is such that the car freely falls in the descending direction and the governor device does not operate, the governor operates so that the impact is not a large impact and the magnitude thereof is equal to or less than a value specified by law. Safety and buffer devices are provided.

When the car 1 is on the lowest floor and falls freely in the ascending direction, the counterweight 5 collides with the buffer device 12 at a considerably high speed. The shock of the car at this time is a considerable shock, although smaller than the counterweight that directly collides, and the damage to the passenger safety and each part of the elevator spreads, and not only the brake mechanism 2 is damaged but also returns. As a result, it takes time and the service to the customer is deteriorated.

As described above, when the mechanical braking force due to the breakage of the brake mechanism disappears and the motor power is turned off, other stop devices are not always sufficient.
Therefore, an object of the present invention is to prevent the free fall of the car when detecting the disappearance of the mechanical braking force due to the breakage of the brake mechanism, and to control and drive the car to contact and stop at a low speed with the shock absorber on the terminal floor. Is to get the means.

[0015]

Means for Solving the Problems The above conventional problems are solved.
Therefore, the elevator control device of the present invention
When the car in an open runs, the car by the restart of the electric motor
Stop door on the middle floor and get off the car for passengers in the car.
After passengers get off,
And control means for causing the car or the counterweight to contact and stop on the buffer device at the bottom of the hoistway .

[0016]

[Action brake system is damaged, when detecting this in a pressure sensor of the brake oxalic portion performs control for running a low speed, if there are passengers in the car is stopped once in the middle floor, remains door open, Display an abnormal situation and guide passengers to get off. After the passengers get off, the doors are closed, the vehicle is driven again at a low speed, and the car is brought into contact with the shock absorbing device on the last floor to stop the car.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on an embodiment shown in FIG.

A pressure sensor 14 is provided between the brake shoe 8 and the brake arm 13 to detect a braking force by the brake spring 9 during braking. Furthermore, turning on the motor power,
OFF and ON of the electromagnetic solenoid 10 for brake release,
An auxiliary contact for detecting OFF and a limit switch are provided.

[0019] In this configuration, the control device, the electromagnetic solenoid OFF by the electric motor supply opening, upon detecting a braking force zero, it is determined that the brake mechanism failure, you switch the low speed running operation control to restart the motor . And in the middle of the basket
Stop the door once on the floor and open the door,
And instruct the passengers in the car to get out of the car. Passengers
After dismounting, the door is closed, the car is driven again at a low speed in either the heavy direction of the car or the counterweight, and the car 1 or the counterweight 5 is brought into loose contact with the shock absorber 11 or 12 to stop.

According to the present invention having such a configuration, the safety of the operation of the elevator during operation is ensured as follows.

When the car is running, there should be no stopping force due to the brakes. This is the same as when the car is damaged from the viewpoint that the brakes do not work, so that the running control is continued. There is no distinction between normal operating conditions and when broken. But,
What is different from the normal case is that when the user arrives at the destination floor and stops, the operation control is stopped, and the vehicle falls free.

Elevator motors have a continuous rating limit, and continuous control can lead to motor burnout.

A feature of the present invention is that, when a breakage state of the brake mechanism occurs, a function is provided for causing the elevator to run at a low speed to a position where the motor does not fall free even if the power supply of the motor is released.

There is a difference in weight between the basket and the counterweight.
The car is configured to be balanced in a state where a load of 45% to 50% of the rated load weight is applied to the car. That is, even if the car has a weight that balances the counterweight and there is no stopping force due to the brake, braking force by the brake is always required except in a situation where the car and the counterweight do not move due to the balance.

The braking force is generated when the brake shoe is pressed against the brake drum by the force of the brake spring. When the elevator is started, a current flows through the brake coil according to a command from the control panel, and a brake lever is pushed to generate a gap between the brake shoe and the drum, thereby eliminating the braking force. After confirming that the braking force has been lost, the control panel applies a running control torque to the electric motor to drive the elevator. At the time of landing, it is confirmed that the braking force by the brake mechanism has returned, and the driving force of the electric motor is eliminated.However, when it is detected by the pressure sensor provided between the brake shoe and the brake arm that the braking force does not return, the motor is stopped. While maintaining the driving force, if the car door coincides with the landing door, stop control with the door open, and if there is a deviation, drive at a low speed to the coincident position, and after the door position coincides Announcement and display to passengers to get off.

After confirming that all the passengers have got off, the door is closed,
Start running at a low speed to the person with a heavy basket or counterweight.

When either the car or the counterweight comes into contact with the shock absorber and reaches a position where it cannot run, the power supply of the electric motor is released and a standby state is displayed by displaying a failure status. The arrival at the position where the vehicle does not travel is detected by the operation of a car position detection limit switch provided in the elevator shaft.

[0028]

According to the present invention, when the car brake mechanism is damaged, the car or the weight can be gently stopped to rescue the passengers safely, the elevator parts are hardly destroyed, and the accident recovery is easy. Becomes

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an elevator according to the present invention;

FIG. 2 is a partial detailed view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cage 2 ... Brake device 6 ... Electric motor 7 ... Brake drum 9 ... Brake spring 10 ... Electromagnetic solenoid

Claims (1)

(57) [Claims] (1) When a car travels with the motor power turned off,
Restart of the motor is stopped the door open in the middle floor of the car by, or
Guide passengers to get out of the car,
After the passenger got off the control to contact and stop the car or counterweight is traveling at a low speed on a shock absorber of the elevator shaft bottom
A control device for an elevator, comprising means .