JPH03264493A - Drive device of escalator - Google Patents

Abstract

PURPOSE:To immediately stop a drive device when a footstep moves in the reversal direction by providing a cam on the output shaft of a speed reducer, installing a limit switch provided with an operation lever and a change-over contact point to be operated by the cam the speed reducer and connecting the above change-over contact point to a drive direction selection circuit inside the controller of a drive unit. CONSTITUTION:In the case of lifting drive, when a key switch KYS of an operation board is turned in the UP direction, an UP contact point is closed and an UP electromagnetic switch U-Ctt is excited so that a motor starts and an escalator is driven to ascend. Accordingly, a cam 12 rotates in the UP direction, and the operation lever 14 of a limit switch LS is inclined to the right side and makes contact along the cam 12, and an UP direction change-over contact point U is made and a holding circuit is formed. When the footstep of an escalator starts to move in the descending direction due to some reason while running in the ascending direction, the cam 12 begins to rotate counterclockwise and the head point part of the operation lever 14 enters the inside of a cut-off part 11 of the cam 12 so that the operation lever 14 is finally turned over and inclined in the DN direction and makes contact with the cam 12, then the operation lever 14 changes over the contact point and opens the electromagnetic switch.

Description

[Detailed description of the invention] [Purpose of the invention] <Industrial application field> The present invention relates to a safety device for escalator operation.

<Prior art> A drive device for operating an escalator has a motor 2, an electromagnetic brake 3, a coupling 4, a reducer 5, etc. installed on a machine bed 1, a small drive sprocket 7 attached to an output shaft 6 of the reducer 5, The steps 10 are driven via a drive chain 8, a step chain 9, etc. connected to the tip.

Conventionally, in such a drive device, if the operating direction of the escalator (ascending (LIP) direction or descending (DN) direction) changes to the opposite direction for some reason during operation, the corresponding direct There were no safety devices in place.

However, a 3E relay is installed in the control circuit to detect phase loss, reverse phase, and overload of the three-phase input power supply to the escalator.
A safety device is provided that prevents the motor 3 from reversing by detecting an abnormality in the input power to the motor 3 and stopping the escalator.

(Problem to be solved by the invention) However, the safety measure using this 3E relay only checks whether there is an abnormality in the input power supply, and does not detect the actual operation of the escalator, so for example, if an abnormality occurs inside the motor. The problem is that even if an escalator step that is operating in an upward (up) direction starts to move in a downward (DN) direction, it cannot be detected.

The object of the present invention is to provide a safety device that immediately detects movement of an escalator step in a direction opposite to the direction in which the escalator is being operated and stops the escalator.

[Structure of the invention]

(Means for Solving the Problems) To achieve the above object, the present invention extends the output shaft of the reducer of the escalator drive device and attaches a disc-shaped cam having a notch on the outer periphery.

A limit switch having an operating lever operated by this cam and a switching contact is attached to the reducer, and the switching contact is connected in series to a driving direction selection circuit in the control device of the drive device to form a control circuit. .

(Function) When the escalator is normally operating in the upward or downward direction, the operating lever of the limit switch contacts the rotating cam and tilts in either the UP or DN direction, closing its contact point. .

However, when some abnormality occurs and the escalator step starts moving in the opposite direction, the tip of the lever gets stuck in the notch of the cam, the lever tilts in the opposite direction, and the limit switch switching contact switches and is closed. The contacts are opened, the self-holding circuit is opened, the control power is cut off, and the escalator stops.

<Example> The present invention will be explained based on the example shown in FIGS. 1 to 6.

A cam 1 having a notch 11 on the outer periphery at the shaft end opposite to the output shaft 6 to which the small drive sprocket 7 of the reducer 5 is attached.
Install 2.

A limit switch LS having a switching contact is attached to the main body of the reducer 5 using a plate 13, and an operating lever 14 of the limit switch is brought into contact with the cam 12. The cam 12 is made of a synthetic resin with a low coefficient of friction and high wear resistance, such as ultra-high molecular weight polyethylene, and the relationship between the cam 12 and the limit switch [S is the notch 11 of the cam when the operating lever 14 is in its neutral position. Attach it so that its tip fits inside.

The switching contacts (U, El) of this limit switch are incorporated into the control circuit as follows.

Select the driving direction of the escalator drive device, which consists of the safety circuit 15 and the operation circuit of the electromagnetic switch for operating the yS motor (U-C [[ and D-C[t]), and the key switch on the operation panel that starts the operation. A switching contact U is connected to the self-holding circuit of the electromagnetic switch in each operating direction of uP and DN in the circuit.
, D are inserted in series.

When starting the escalator, for example, into upward operation using the drive device configured as described above, the key switch KVS on the operation panel is
When turned in the P direction, the Up contact closes and the uP electromagnetic switch u-
ctt is excited, the motor is started, and the escalator is operated upward.

Due to this upward operation, the cam 12 rotates in the uP direction, and the operating lever 14 of the limit switch LS tilts to the right as shown in Fig. 3 and comes into contact with the cam 12, and the UP direction switching contact U is closed to open and close the electromagnetic switch. A self-holding circuit is formed with the self-holding contacts of the device u-ctt.

Therefore, even if the key switch KVS is released at this time, the escalator continues to operate. In the case of descending operation, the above operation is opposite and has the same effect.

If, for some reason, the escalator step 10 begins to move downward while traveling in the upward direction as described above, the cam 12 begins to rotate counterclockwise, and the cam 12
The tip of the operating lever 14 that is in contact with the outer peripheral surface of the cam 12 is inserted into the notch 11 of the cam 12, and further, due to the rotation of the notch 11, the operating lever 14 is moved as shown in Fig. 4.5.
It is reversed, tilted in the DN direction, and comes into contact with the cam 12. At this time, the operating lever 14 switches the contacts, the UP direction self-holding circuit is opened, the electromagnetic switch u-ctt is opened, the power to the motor circuit is cut off, and the escalator is stopped.

At this time, the switching contact is closed in the DN direction, but since the normally open contact of the descending switch DC[t is open, the escalator will not be operated in the opposite direction.

As described above, the device of the present invention can safely and reliably detect an abnormality in the actual operating direction of the escalator and stop the escalator.
It is not a high-cost device like a relay, but is an inexpensive and highly economical device.

As another embodiment of the present invention, by providing a plurality of notches 11 in the cam 12, the detection resolution of reverse rotation detection can be increased.

Further, the detection position in the traveling direction of the step 10 (limit switch mounting position) is not limited to the reducer output shaft, but the same effect can be obtained by detecting at any other position between the reducer and the step.

〔Effect of the invention〕

The present invention mechanically detects abnormalities in the operating direction of escalators.
It is possible to sell escalator safety devices that can be detected directly, are safe, reliable, and highly economical.

[Brief explanation of drawings]

FIG. 1 is a plan view of a drive device according to the present invention, and FIG.
Figures 3, 4, and 5 are views from the ■-■ arrows in Figure 1, and are explanatory diagrams of the switching operation of the limit switch operating lever, and Figure 6 is according to the present invention. FIG. 7 is a developed view of the control circuit, and is a perspective view of the top of the escalator. 5...Reducer 14...Operating lever [S...Limit switch Figure 8 is a view from the ■-■ line arrow in Figure 7 6...Output shaft 12...Cam drive

Claims (1)

[Scope of Claims] In an escalator drive device comprising a motor, a speed reducer, a control device, etc., a cam for switching an operating lever of a limit switch according to the rotational direction of the output shaft of the speed reducer is attached to the output shaft of the speed reducer. . An escalator drive device, characterized in that the limit switch is provided on the speed reducer side, and a switching contact of the limit switch is connected to a driving direction selection circuit in a control device.