JP2008290846A - Brake device for passenger conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brake device for a passenger conveyor without a damper and preventing dropping of a main brake and an auxiliary brake at the same time in an electric system. <P>SOLUTION: The brake device for a passenger conveyor comprises a motor 24 for driving a main driving sprocket 9, a ratchet wheel 19 arranged on the main driving sprocket 9, a lever 38 whose one end engages with a pawl 19a of the ratchet wheel 19, a main brake 26 having a main coil 26L for restraining/releasing the motor 24, and an auxiliary brake 34 having an auxiliary coil 34L for acting to move the lever 38 in the direction of disengaging the ratchet wheel 19 from the lever 38, wherein, when a first switch 53 is opened, a first electric current I1 flowing in the main coil 26L is carried through a resistor 57 and a first circulation diode 55, and the first electric current is attenuated faster than a second electric current by the resistor 57. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a brake device for a passenger conveyor.

A conventional passenger conveyor brake device includes a main drive sprocket and a driven sprocket around which a step chain to which a step row is attached is wound, and a flange provided on a main shaft of the main drive sprocket, as described in Patent Document 1 below. A ratchet wheel that is pressed and engaged via a friction material, a lever that is elastically biased by the ratchet wheel by a resilient member, and one end of which engages, and the ratchet wheel and the lever are disengaged. An auxiliary brake device for a passenger conveyor having an electromagnetic coil that swings the lever in a direction to be provided with a damper provided at the other end of the lever to prevent the lever from being momentarily biased by an elastic member. is there.

According to such a brake device for a passenger conveyor, the damper provided at the other end of the lever suppresses the urging force of the elastic member that urges the lever to engage with the ratchet wheel. Regardless of the emergency stop due to the operation of the equipment, etc., the main brake is activated when the escalator is stopped, the auxiliary brake is delayed with respect to the main brake of the motor, and the main brake and the auxiliary brake are operated simultaneously, and the passenger conveyor suddenly stops. Can be avoided.
JP-A-63-315483

However, since the brake device for the passenger conveyor has a damper provided at the other end of the lever to prevent the lever from being momentarily biased by the elastic member, there is a problem that the structure is complicated and the size is increased. It was.

The present invention has been made to solve the above-described problems, and provides a passenger conveyor brake device that prevents a main brake and an auxiliary brake from falling simultaneously in an electric system without having a damper. With the goal.

According to a first aspect of the present invention, there is provided a brake system for a passenger conveyor, wherein a main drive sprocket and a driven sprocket around which a step chain to which steps are attached are wound, a drive chain is hung on the main drive sprocket and the driven sprocket, and the main drive sprocket is mounted. A motor to be driven, a ratchet wheel provided on the main drive sprocket, a lever having one end engaged with the ratchet wheel, a first brake having a first electromagnetic coil for restraining and releasing the motor, and the ratchet And a second brake having a second electromagnetic coil for engaging and releasing the wheel and the lever, and a control unit having different drop times of the first brake and the second brake. is there.

It is preferable that the control means in the brake device for a passenger conveyor according to the second aspect of the invention has a resistance for returning the current flowing through the first electromagnetic coil. Thereby, since the 1st brake falls faster than the 2nd brake, simultaneous fall of the 1st brake and the 2nd brake can be prevented with simple composition.

It is preferable that the control means in the brake device for a passenger conveyor according to the third invention cuts off the voltage applied to the first electromagnetic coil after reducing the current of the first electromagnetic coil. Thereby, since the 1st brake falls faster than the 2nd brake, simultaneous fall of the 1st brake and the 2nd brake can be prevented with simple composition.

According to the present invention, since the first brake and the second brake are prevented from falling simultaneously in the electric system without having a damper, the shock of the passenger on the step can be reduced.

Embodiment 1 FIG.
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall view of a passenger conveyor showing an embodiment of the present invention, and FIG. 2 is an overall view of a brake device for the passenger conveyor shown in FIG. FIG. 3 is a circuit diagram of the brake device for the passenger conveyor shown in FIG.
In FIG. 1, the passenger conveyor is wound around a main drive sprocket 9 and a driven sprocket 11 in which a step chain 7 attached to the step 5 is arranged on the upper and lower floors. A driven sprocket 15 is attached to the main shaft 13 attached to the main drive sprocket 9, and a drive chain 17 is wound around the driven sprocket 15 and the drive sprocket 22 of the speed reducer 20. The power from the speed reducer 20 is transmitted to the main drive sprocket 9 via 17. A motor 24 is directly connected to the speed reducer 20, and a main brake 26 as a first brake and a flywheel 28 are provided on the shaft of the motor 24.

The main brake 26 brakes the step 5 when the passenger conveyor stops, and the braking force of the main brake 26 is transmitted to the main drive sprocket 9 via the speed reducer 20 and the drive chain 17. Further, when a power failure occurs when a large number of passengers are on the step 5, the passenger conveyor may reversely move due to the weight of the passengers. Therefore, the auxiliary brake device 30 that directly applies a braking force to the main shaft 13 is provided. Is provided.

In FIG. 2, the auxiliary brake device 30 has a ratchet wheel 19 movably held on a main shaft 13, and a lever 38 that can be engaged with a claw 19 a of the ratchet wheel 19 is provided. The lever 38 operates in the event of a power failure or the like and engages with the claw 19a.
A lever 38 is pivotally supported on the support base 32 via a pin 36, one end of which is engageable with a claw 19a of the ratchet wheel 19, and the other end of the lever 38 is shown in FIG. It is given a clockwise urging force. A connection pin 37 is attached between the other end of the lever 38 and the pin 36, and a plunger 34 a of the auxiliary brake 34 as a second brake and the lever 38 are connected via the connection pin 37.

In FIG. 3, the circuit of the brake device includes a converter 51 that rectifies an AC power supply e to generate a DC voltage, and a main coil as a first electromagnetic coil of the main brake 26 via a first switch 53 at the output of the converter 51. 26L is connected, and a first freewheeling diode 55 and a first resistor 57 are connected in series to the main coil 26L. An auxiliary coil 34L as a second electromagnetic coil of the auxiliary brake 34 is connected to the output of the converter 51 via the second switch 63, and a second return diode 65 is connected in parallel to the auxiliary coil 34L.

The operation of the brake control device for a passenger conveyor configured as described above will be described with reference to FIGS.
<During normal operation>
When power is applied to the motor 24, the first switch 53 and the second switch 63 are turned on (closed), the first current I1 flows through the main coil 26L, the main brake 26 is turned on, and the auxiliary coil 34L is turned on. The second current I2 flows and the auxiliary brake 34 is also turned on. As a result, the motor 24 rotates and the steps 5 of the passenger conveyor circulate and transport the passengers on the steps 5. When the stop command is issued, the power of the motor 24 is cut off, the first switch 53 is opened, the first current I1 is cut off to the main coil 26L, the main brake 26 is dropped and the motor 24 is restrained to step. 5 is stopped.

<When stopped>
When a power failure occurs, the AC power source disappears, so that the power source of the motor 24 is cut off and the DC power source of the converter 51 disappears. As a result, the first current I1 flowing in the main coil 26L flows through the first resistor 57 and the first freewheeling diode 55, and the first current I1 is consumed in the first resistor 57 as shown in FIG. The main brake 26 falls and restrains the motor 24 at time ta after the power failure. At the same time, the second current I2 flowing through the auxiliary coil 34L flows through the second return diode 65, attenuates as shown in FIG. 4, and the auxiliary brake 34 falls later than the main brake 26 at time tb after the power failure. To do. Thereby, the lever 38 engages with the claw 19a of the ratchet wheel 19 to stop the movement of the steps 5 of the passenger conveyor.

The brake system of the passenger conveyor of the above embodiment hangs the drive chain 17 on the main drive sprocket 9 and the driven sprocket 11 on which the step chain 7 to which the step 5 is attached is wound, and the main drive sprocket 9 and the drive sprocket 22. A motor 24 that drives the drive sprocket 9 via the speed reducer 20, a ratchet wheel 19 provided on the main drive sprocket 11, a lever 38 that has one end engaged with a claw 19 a of the ratchet wheel 19, and the motor 24 A first brake having a main brake 26 having a main coil 26L for restraining and releasing the lever, and an auxiliary brake 34 having an auxiliary coil 34L for operating the lever 38 in a direction to release the engagement between the ratchet wheel 19 and the lever 38. When 53 is opened, the first current I1 flowing in the main coil 26L is The current flows through the resistor 57 and the first return diode 55, and the resistor 57 attenuates the first current more rapidly than the second current. Thereby, after the main brake 26 falls faster than the auxiliary brake 34, the auxiliary brake 34 falls. Thereby, the stop shock of the step 5 becomes stepwise by the simple electrical configuration as described above.

Embodiment 2.
In the above embodiment, the resistor 57 is used to make the fall time of the main brake 26 faster than that of the auxiliary brake 34. However, in the present embodiment, after the main brake 26 is activated, the resistor is inserted and the main brake 26 is inserted. After suppressing the current flowing through the main brake 26, the main brake 26 is released to make the fall time of the main brake 26 faster than the auxiliary brake 34.
This embodiment will be described with reference to FIG. FIG. 5 is a circuit diagram of a brake device for a passenger conveyor showing another embodiment. In FIG. 5, the same reference numerals as those in FIG.

In FIG. 5, the circuit of the brake device is such that the main coil 26L of the main brake 26 is connected to the output of the converter 51 via the first switch 53 and the current limiting resistor 101, and the first return diode is connected to the main coil 26L. 55 are connected in parallel. The current limiting resistor 101 is connected in parallel with a normally open contact 103 that opens when the main brake 26 is released and closes when the main brake 26 is restrained.
Thus, when the motor 24 is driven, the first and second switches 53 and 63 are closed in a state where the normally open contact 103 is closed, and a current is passed through the main coil 26L and the auxiliary coil 34L. When the main brake 26 and the auxiliary brake 34 are opened, the normally open contact 103 is opened, the current limiting resistor 101 is inserted, the current flowing through the main brake 26 is reduced, and the main brake 26 is kept open.

Here, when a power failure occurs, the AC power source e disappears, so the DC power source of the converter 51 disappears. As a result, the third current flowing in the first brake 26L flows through the first return diode 55 and attenuates, and the main brake 26 falls at time ta after the power failure. At the same time, a fourth current larger than the third current flowing in the main coil 26L flows through the second return diode 65 and attenuates, and the auxiliary brake 34 falls later than the main brake 26 at time tb after the power failure. Thereby, the movement of the steps 5 of the passenger conveyor is stopped.

  The present invention can be applied to passenger conveyors.

1 is an overall view of a passenger conveyor showing an embodiment of the present invention. 1 is an overall view of a passenger conveyor brake device according to an embodiment of the present invention. It is a circuit diagram of the brake device of the passenger conveyor shown in FIG. It is a curve figure which shows operation | movement of the brake device of the passenger conveyor shown in FIG. It is a circuit diagram of the brake device of the passenger conveyor which shows other embodiment of this invention.

Explanation of symbols

  5 steps, 7 steps chain, 9 main drive sprocket, 11 driven sprocket, 17 drive chain, 19 ratchet wheel, 20 speed reducer, 24 motor, 26 main brake, 26L main brake, 34 auxiliary brake, 34L auxiliary brake coil, 38 lever 57 resistance.

Claims (3)

A main drive sprocket and a driven sprocket around which a step chain with a step attached is wound;
A motor that hangs a drive chain on the main drive sprocket and the driven sprocket, and drives the main drive sprocket;
A ratchet wheel provided on the main drive sprocket;
A lever whose one end engages with the ratchet wheel;
A first brake having a first electromagnetic coil for restraining and releasing the motor;
A second brake having a second electromagnetic coil for engaging and releasing the ratchet wheel and the lever;
Control means for different drop times of the first brake and the second brake;
A brake device for a passenger conveyor, comprising: The control means has a resistance for refluxing the current flowing through the first electromagnetic coil.
The passenger conveyor brake device according to claim 1. The control means cuts off the applied voltage of the first electromagnetic coil after reducing the current flowing through the first electromagnetic coil.
The passenger conveyor brake device according to claim 1.

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