JPH0891753A - Brake device for escalator - Google Patents

Abstract

PURPOSE: To provide a brake device for an escalator which can carry out brake application so that the favourable stop distance for the safety traveling can be obtained, independently of the variation of the load condition applied to the escalator. CONSTITUTION: An escalator is brake-applied by the first brake 3a which is operated when stop operation is performed during the operation of an escalator, and the second brake 3b which operates after the lapse of a ceetain time from the time point when the stop operation is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking device for an escalator, which brakes the escalator by simultaneously braking the escalator drive motor while the power supply is stopped.

[0002]

2. Description of the Related Art Conventionally, an escalator braking device of this type starts a braking operation when a safety device or a protective device is activated or a stop button is pressed to perform a braking operation, and a load condition is applied. Also, the escalator is braked so that the escalator is stopped after a lapse of a certain time determined in consideration of a certain slip distance.

[0003]

However, in the conventional case, since there is only one system for braking the escalator, when the escalator is overloaded with passengers exceeding the capacity, or when the step of the escalator is stepped on. If the dynamic load increases significantly due to the movement of many passengers, there is a problem that the stopping distance from the start of braking to the stop may be longer than the preferable distance. It was

The present invention has been made in view of the above circumstances, and an object of the present invention is to brake so as to obtain a preferable stopping distance for safe driving regardless of fluctuations in load conditions applied to the escalator. It is to provide a braking device for an escalator that operates.

[0005]

In order to achieve the above object, the present invention relates to a braking device for an escalator, which brakes an escalator by simultaneously braking the escalator driving motor by putting the escalator driving motor in a power supply stopped state. In response to the first brake, and a second brake in which the braking operation is started after a predetermined time has elapsed from the time when the predetermined stop operation is performed. .

[0006]

In the braking device for the escalator according to the present invention, the system for braking the escalator has two systems, that is, the system having the first brake and the system having the second brake, so that a predetermined stop operation is performed. Due to this, the power supply to the escalator drive motor is stopped, and at the same time, the first brake starts the braking operation, and after the lapse of the required time determined by the operating characteristics of the escalator, that is, the constant operation determined by the operating characteristics of the escalator. Braking is performed at the stop distance. Also,
The second brake starts the braking operation after a predetermined time has elapsed from the time when the predetermined stop operation is performed.

Normally, a sufficient braking force can be obtained only by the operation of the first brake, but when a passenger with a load significantly exceeding the rating gets on the escalator due to a flood of passengers, etc., the first braking is performed after a certain period of time. In addition to the braking force of the
Safe and reliable braking can be performed by the operation of the second brake.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a control circuit showing an essential part of an embodiment of the present invention.

1 is a power supply for driving the escalator, 2 is
It is an electric motor driven by the power source.

Reference numeral 3a is a first brake that operates during a normal stop, and 3b is a second brake that operates a fixed time after the brake device 1 operates. The first brake coil 8a and the second brake coil 8b are used. It works in conjunction with each brake coil.

Reference numeral 5 is an escalator emergency stop switch, and 7 is a driving operation switch for driving operation. Four
Is a drive relay operated by operating the driving operation switch, and 4a, 4b, 4c are drive relay a contacts that are closed by the operation of the drive relay.

Further, 6 is a timer device for providing a constant interval between the operations of the first brake and the second brake, and 6a
Is a time contact of the timer device.

In such a structure, in the normal escalator, the drive relay 4 is excited by operating the operation switch 7, and at the same time, the contact a 4a of the relay is closed and power is supplied to the drive motor 2. . The drive relay a contact 4b is also closed, and the first brake coil 8a is excited to release the first brake 3a. Further, the time a contact of the timer 6 is closed and the second brake coil 8b is also released.

The drive relay a contact 4c is also closed in association with the operation of the drive relay to form a self-holding circuit, and the operation is continued even after the operation of the operation switch 7 is stopped.

When the emergency stop switch 5 is operated in such a state, the excitation of the drive relay is released and at the same time the first relay is deenergized.
~ All the third drive relay a contacts 4a, 4b, 4c are released. In this way, the power supply to the drive motor is stopped,
At the same time, the excitation of the first brake coil 8a is released, and the first brake coil 8a is released.
The escalator stops with a constant braking distance by the braking force of the brake 3a.

For example, the braking force of the first brake 3a of the normal escalator is set to a force capable of stopping normally even when the escalator load, that is, the number of passengers is 100%. Therefore, even when the load is 100%, the escalator normally stops by the braking force of the first brake.

However, when the load greatly exceeds 100%, or when many passengers move on the step and the dynamic load increases significantly, after the escalator is stopped,
You will not be able to stop even after the time required to travel the preset distance has elapsed. In such a case, the time a contact 6a of the timer 6 is released at a fixed time after the stop operation, and the second contact
The excitation of the brake coil 8b is released, the second brake 3b operates, and the escalator is surely braked by a stronger braking force.

[0019]

According to the present invention, when the rated load is applied, the vehicle is stopped after traveling a certain distance by the braking force of only the first brake, and even when the load is remarkably increased. The braking force of the first brake and the second brake ensures reliable braking of the escalator.

In this way, a stable braking force can be obtained irrespective of the load condition of the escalator, and it is possible to prevent an abrupt stop or, conversely, an abnormally long braking distance.
It can prevent unexpected accidents.

[Brief description of drawings]

FIG. 1 is a diagram showing a control circuit forming a main part of an embodiment of the present invention.

[Explanation of symbols]

 1 Power Supply 2 Drive Motor 3a First Brake 3b Second Brake 4 Drive Relay 4a Drive Relay a Contact 4b Drive Relay a Contact 4c Drive Relay a Contact 5 Emergency Stop Switch 6 Timer 6a Timer a Contact 7 Drive Operation Switch 8a First brake coil 8b Second brake coil

Claims (2)

[Claims] 1. A braking device for an escalator, which brakes an escalator by simultaneously braking an escalator driving motor to stop the power supply, and a first brake in which a braking operation is started in response to a predetermined stop operation, An escalator braking device comprising: a second brake that starts a braking operation after a lapse of a predetermined time from the time when the predetermined stop operation is performed. 2. The braking force of the second brake is made larger than the braking force of the first brake so that the time required for the escalator to stop is always maintained within a certain range. The escalator braking device according to 1.