JPH0519275U - Escalator braking device - Google Patents

Abstract

(57) [Summary] [Construction] In a braking device Mg of an escalator in which a braking device operates regardless of which safety switch is actuated among the plurality of safety switches, in the braking device Mg of the escalator, the plurality of safety devices are promptly assembled according to an emergency request degree Sb. ₁ divided into two groups of ～Sbn and slow Giki set Sc ₁ ～Scn, early when the safety switch Giki set Sb ₁ ～Sbn is operated in a shorter stopping distance, slow Giki set Sc ₁ to S
When the cn safety switch was activated, the stopping distance was increased. [Effect] It has the effect of protecting passengers other than those involved in the accident from secondary disasters such as shogi.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a braking device for an escalator.

[0002]

[Prior Art]

2 is a circuit diagram of a main part of a conventional braking device for an escalator. In FIG. 2, P is a push button for starting an escalator, M is a start condition relay of a main motor (not shown) for driving the escalator in an ascending or descending direction, A is a self-holding relay, Aa is a normally open contact of A, Mg is a relay that operates an electromagnetic braking device, B is a safety switch operation detection relay, Ba is a normally open contact of B, and Sa ₁ ... San are incorporated in series. Shows the normally closed contact point of the safety device.

In starting the escalator, first, when the push button P for starting the escalator is manually inserted, (+)-P-Ba-A-(-) is closed and the contact Aa is turned on (+)-Aa. The circuit of -Ba-A-(-) is self-held, the electromagnetic braking device is excited by (+)-Aa-Ba-Mg-(-), the brake is released, and (+)-Aa-Ba. -M-(-) makes it possible to raise or lower the escalator. If any safety device is activated while the escalator is running, San will open, Ba will open, the main motor will stop, the electromagnetic braking device will be demagnetized, the brake will work instantaneously, and the escalator will suddenly stop. It has become. Q is a switch that stops the escalator.

As a reference example of this type of apparatus, Japanese Utility Model Laid-Open No. 59-133575 can be cited.

[0005]

[Problems to be solved by the device]

 By the way, the safety device of the escalator includes a footrail on the handrail inlet, a handrail inlet switch that operates when the hand or head is caught, and a foot on the skirt guard when an infant playing near the exit of the escalator. In addition to urgent safety devices such as a skirt guard switch that operates when you push the tip and ride your foot between the scart guard and the step, step drive chain over the years. Is relatively low urgency such as a terminal chain switch that operates when the pitch of the sprocket and the chain are out of alignment and a step lift detection switch that operates when your foot is caught between the front and rear steps. There is a safety device. In general, the escalator has a large number of passengers in addition to the person involved in the accident, so an emergency stop may cause a secondary disaster such as shogi defeat. In the above-mentioned conventional technology, all safety devices are handled with the same degree of urgency, and therefore, there is a problem that a secondary disaster is likely to be caused because a sudden stop is performed even when a safety device with a low degree of urgency is operated.

An object of the present invention is to provide an escalator braking device that can protect passengers other than the one involved in the accident from a secondary disaster such as shogi.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a brake device for an escalator in which a brake device operates regardless of which safety switch of the plurality of safety switches is operated. It is divided into two groups, the first group and the late group, and the stopping distance is shortened when the early group safety switch is activated, and the stopping distance is long when the late group safety switch is activated.

[0008]

[Action]

 In the present invention, the safety device is divided into two groups, an early group and a late group, according to the degree of urgent demand. When the safety switch of the early group operates, the stop distance is shortened and the safety switch of the late group operates. If you do so, you will be able to protect the passengers who are not involved in the accident from a secondary disaster such as shogi, because the stopping distance will be lengthened.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1, 3, and 4.

FIG. 1 is a circuit diagram of essential parts showing a braking device for an escalator, FIG. 3 is a relay operation diagram, and FIG. 4 is a braking distance comparison diagram for an escalator.

In FIG. 1, Sb _{1 to} Sbn are normally-closed contacts of a safety device of early group, Sc _{1 to} Sc n are normally-closed contacts of a safety device of late group, and C is _one of Sb _{1 to} Sbn. A relay that demagnetizes when the circuit is opened, Ca is a normally closed contact of relay C, D is a relay that is demagnetized when any of Sc _{1 to} Scn is opened, Da is a normally open contact of relay D, and Db is a relay. Normally closed contact of D, R ₁ and R ₂ are diodes, E is a relay that degausses when D is demagnetized, Ea is a normally open contact that opens when E is demagnetized, Db is a normally closed contact that closes when D is demagnetized. Here, E is for making the closing of the contact Db earlier than the opening of the contact Ea, and other reference numerals indicate the same parts as in FIG.

In the above-mentioned configuration, when Sbn, in which the safety device of the immediate preparatory group operates, opens, Ca opens, the main motor stops, and the contact Db remains open, so the braking distance is as shown by the solid line C in FIG. become. Further, when the safety device of the delay group operates and Scn opens, the opening of Da and the closing of Db occur at the same time, and Ea opens after a moment as shown in FIG. Therefore the braking distance by the circuit of Mg-Db-R ₂ -Mg is as D dotted line.

[0013]

[Effect of the device]

 According to the present invention, the safety device is divided into two groups, an early group and a late group, according to the degree of urgency, and when the safety switch of the early group is activated, the stop distance is shortened to ensure the safety of the late group. When the switch is activated, the stopping distance is increased, which has the effect of protecting passengers other than those involved in the accident from a secondary disaster such as shogi.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an essential part showing an embodiment of a braking device for an escalator according to the present invention.

FIG. 2 is a main part circuit diagram showing a conventional braking device.

FIG. 3 is a relay operation diagram.

FIG. 4 is a comparison diagram of braking distances of an escalator.

[Explanation of symbols]

M Start condition relay of main motor Mg Relay for activating electromagnetic braking device C Relay for early safety device D Relay for late safety device Sb ₁ ~ Sbn Normally closed contact of early safety device Sc ₁ ~ Scn For late safety device Normally closed contact R ₁ , R ₂ diode Db Normally closed contact of relay D

Claims (1)

[Scope of utility model registration request] 1. A braking device for an escalator in which a braking device operates regardless of which safety switch is actuated among the plurality of safety switches. The escalator braking device is divided into groups, and the stop distance is shortened when the safety switch of the early group operates, and the stop distance is lengthened when the safety switch of the late group operates.