JP5739045B1 - Passenger conveyor - Google Patents

Abstract

Provided is a passenger conveyor capable of reliably stopping a step even when a large load is applied when the passenger conveyor is stopped by an electromagnetic brake. When a shaft sensor 19 detects rotation of a rotating shaft in a downward direction after operating an electromagnetic brake 21 and stopping a motor 20, an inverter is operated with the electromagnetic brake 21 operated. Inverter control of the motor 20 is started so that torque for rotation in the upward direction of the rotary shaft is generated using the device 6, and the torque is increased until rotation of the rotary shaft in the downward direction is stopped. [Selection] Figure 2

Description

  Embodiments of the present invention relate to passenger conveyors.

  In a passenger conveyor braking system such as an escalator or a moving sidewalk, an electromagnetic brake is attached to a rotating shaft of a motor that moves a step, and the passenger conveyor is stopped by the electromagnetic brake.

JP-A-3-106793 JP 2002-2111866 A

  However, when the passenger conveyor stops while a lot of people are on the passenger conveyor due to congestion or the like, the load on the step may exceed the assumed load. At this time, there is a problem in that the stop state cannot be maintained by the holding ability of only the electromagnetic brake due to an excessively large load, and the step starts to descend.

  Then, in view of the said problem, embodiment of this invention aims at providing the passenger conveyor which can stop a step reliably, even if a heavy load is applied when a passenger conveyor stops with an electromagnetic brake.

  According to an embodiment of the present invention, a plurality of steps that are raised or lowered, a step chain that is connected to the plurality of steps, a drive sprocket that rotates the step chain, and the steps that move in the up or down direction. A motor that rotates the drive sprocket, an inverter that outputs a drive current to the motor using a voltage from an AC power source, and controls the torque of the motor by an inverter, and an electromagnetic that stops the rotating shaft of the motor A brake, a shaft sensor for detecting the rotation direction of the rotating shaft, and after the motor is stopped by operating the electromagnetic brake, the shaft sensor detects the rotation of the rotating shaft in the descending direction; While the electromagnetic brake is in operation, the inverter device is used to generate the torque for rotating the rotating shaft in the upward direction. Start the inverter control, the rotation of the lowering direction of said rotary shaft is a passenger conveyor and a control unit to increase the torque until it stops.

Explanatory drawing of the escalator of this embodiment. Escalator electrical circuit. The flowchart which shows the control method at the time of the stop of an escalator.

  Hereinafter, a passenger conveyor according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the escalator 10 will be described with reference to FIGS.

(1) Escalator 10
The structure of the escalator 10 will be described with reference to FIG. FIG. 1 is an explanatory view of the escalator 10 as seen from the side.

  A truss 12 of the escalator 10 is supported using support angles 2 and 3 across the upper and lower floors of the building 1.

  A driving device 18 is provided inside the upper floor machine room 14 at the upper end of the truss 12. The drive device 18 includes a motor 20 including an induction motor (induction motor) and a drive chain 22 operated by the motor 20, and a drive sprocket 24 is rotated by the drive chain 22. An electromagnetic brake (MB) 21 is provided on the rotating shaft of the motor 20. Further, a control device 50 is provided inside the machine room 14 on the upper floor side. A ratchet device 23 is provided below the drive sprocket 24.

  The electromagnetic brake 21 is attached to the rotating shaft of the motor 20, and by applying power to the brake coil, the brake lining is pressed against the brake drum or the brake disc by a spring force to give a braking force, and the step 30 is The role of stopping within a predetermined stop distance and the rotation of the rotating shaft are held so that the step 30 does not descend after the step 30 stops. The braking torque of the electromagnetic brake 21 is set such that it can be stopped within a predetermined stopping distance due to the balance with inertia, and the holding ability that the step 30 is not lowered even when the passenger is on the step 30 after the escalator 10 stops. The maximum passenger load assumed by the escalator 10 is set to a numerical value with a certain margin. In addition, the brake shoe or brake pad of the electromagnetic brake 21 wears when the number of uses increases, so that maintenance is regularly performed to maintain a normal braking torque for a long period of time, and the brake shoe and the brake pad must be replaced. Do.

  In the ratchet device 60, at the time of emergency stop, the control unit 60 moves the claw, engages with a gear provided coaxially with the drive sprocket 24, and urgently stops the rotation of the drive sprocket 24.

  Although not shown in FIG. 1, the rotation axis of the motor 20 is provided with an axis sensor 19 for detecting the number of rotations and the rotation direction of the rotation axis as shown in FIG. 2. The axis sensor 19 is a pulse generator, for example.

  A driven sprocket 26 is provided inside the lower floor side machine room 16 at the lower end of the truss 12, and a pair of left and right endless step chains 28, 28 are spanned between the drive sprocket 24 and the driven sprocket 26. A plurality of steps 30 are attached at equal intervals to the pair of left and right step chains 28, the wheels 30 a of the steps 30 travel on a guide rail (not shown), and the rear wheels 30 b travel on the guide rail 25.

  On the left and right sides of the truss 12, a pair of left and right balustrades 36, 36 are erected. A handrail belt 38 moves on top of the balustrade 36. A front skirt guard 40 is provided to cover the lower front side of the upper floor side of the balustrade 36, and a lower front skirt guard 42 is provided on the lower front side of the balustrade 36 from the front of the front skirt guards 40, 42. Inlet portions 46 and 48, which are entrances and exits of the handrail belt 38, protrude. A skirt guard 44 is provided at the lower side of the balustrade 36. Operation panels 52 and 56 and speakers 54 and 58 are provided on the upper and lower floors on the inner surface of the front skirt guards 40 and 42 or the skirt guard 44, respectively.

  A boarding board 32 on the upper floor is provided at the entrance of the ceiling surface of the machine room 14 on the upper floor side, and a boarding board 34 on the lower floor side is provided at the entrance of the ceiling surface of the machine room 16 on the lower floor side. It has been.

(2) Electrical Configuration of Escalator 10 Next, the electrical configuration of the escalator 10 will be described based on the electrical circuit of FIG.

  As shown in FIG. 2, the inverter 60, the electromagnetic brake 21, the shaft sensor 19, the speakers 54 and 58, the ratchet device 23, and the safety device 62 are connected to the control unit 60 provided in the control device 50.

  The inverter device 6 is driven by the three-phase AC power supply 4 via the circuit breaker 5 and inverter-controls the rotation speed, rotation direction, and torque of the motor 20 by a control signal from the control unit 60.

  The electromagnetic brake 21 is controlled by the controller 60 to supply power to the brake coil, and rotates or stops the motor 20.

  The shaft sensor 19 outputs information on the rotation speed and rotation direction of the rotation shaft of the motor 20 to the control unit 60.

  The ratchet device 23 can prevent the drive sprocket 24 from rotating in the downward direction as described above, and is operated by the control unit 60.

  As the safety device 62, a skirt guard pinched detection device provided in the skirt guard 44, an inlet pinched detection device provided in the inlet portions 46 and 48, a step lift detection device provided in the guide rail 25, an emergency stop button Etc.

(3) Control method at the time of a stop Next, the control method when the driving | running of the escalator 10 stops is demonstrated based on the flowchart of FIG.

  In step 1, when the safety device 62 operates to stop the escalator 10, the control unit 60 operates the electromagnetic brake 21 to hold and stop the rotation of the rotating shaft of the motor 20, and in the downward direction of the step 30. Also prevents the movement of. Then, the process proceeds to Step 2.

  In step 2, the control unit 60 constantly monitors the rotation direction signal from the axis sensor 19, and if the axis sensor 19 detects rotation of the rotation axis in the downward direction, the process proceeds to step 3 (in the case of YES) If the rotation in the downward direction is not detected, the process returns to Step 1 (in the case of NO), and the rotation of the motor 20 is stopped only by the electromagnetic brake 21.

  In step 3, since the control unit 60 has detected the rotation of the rotating shaft in the downward direction, the control unit 60 determines that a load higher than expected is applied on the step 30, or that the braking torque of the electromagnetic brake 21 is not normal, and the escalator An inspection signal is output to a monitoring center outside the vehicle 10, and audio broadcasting is performed from the speakers 54 and 58 so that the passenger moves from above the step 30. Then, the process proceeds to Step 4.

  In step 4, the control unit 60 starts outputting torque that causes the rotating shaft of the motor 20 to rotate in the upward direction using the inverter device 6, and then gradually increases the torque. Then, the process proceeds to Step 5.

  In step 5, the control unit 60 continues to monitor the rotation direction of the rotating shaft using the shaft sensor 19, and gradually increases the torque until the rotating shaft is stopped by the inverter device 6, thereby stopping the rotation of the rotating shaft. If this is detected, the process proceeds to step 6 (in the case of YES), and if stop cannot be detected, the process proceeds to step 7 (in the case of NO).

  In step 6, the control unit 60 controls and holds the output of the torque with the rotating shaft stopped by the inverter device 6, and proceeds to step 7.

  In step 7, the control unit 60 continues to monitor the rotation direction of the shaft sensor 19. At this time, when the passenger gets further on the step 30 and the load increases, the rotating shaft rotates in the downward direction. On the other hand, when the load decreases when the passenger gets off, the rotating shaft rotates in the upward direction. Therefore, the control unit 60 proceeds to step 8 when the rotation shaft rotates in the descending direction (in the case of YES), and proceeds to step 10 when rotated in the stop or ascending direction (in the case of NO).

  In step 8, since the rotation shaft is rotating again in the downward direction, the control unit 60 controls the inverter device 6 to gradually increase the torque of the motor 20, and proceeds to step 9.

  In step 9, the control unit 60 determines whether or not the torque of the motor 20 by the inverter control of the inverter device 6 has reached the upper limit value. If not, the control unit 60 repeats the control from step 5 to step 9 (NO ), If the upper limit value has been reached, the process proceeds to step 14 (in the case of YES).

  In Step 10, since the rotating shaft is rotating in the stop or ascending direction as described above, if the rotating shaft is rotating in the ascending direction, the control unit 60 proceeds to Step 11 (in the case of YES) and is stopped. Then, the process returns to step 5 (in the case of NO).

  In step 11, the control unit 60 gradually decreases the torque of the motor 20 using the inverter device 6 because the rotating shaft rotates in the upward direction, and proceeds to step 12.

  In step 12, the control unit 60 determines whether or not the torque of the motor 20 has reached the lower limit value. If not, the control unit 60 returns to step 5 (in the case of NO), and if it has reached, proceeds to step 13 ( If yes).

  In step 13, since the motor torque has reached the lower limit value, the control unit 60 determines that the load has been reduced to a state where the torque that supplements the braking torque of the electromagnetic brake 21 is not necessary, and stops the inverter control of the inverter device 6. Return to 1.

  In step 14, the control unit 60 determines that the braking torque of the electromagnetic brake 21 cannot be compensated by the inverter control by the inverter device 6 because the torque has reached the upper limit value, and operates the ratchet device 23. Then, the rotation of the drive sprocket 24 is mechanically stopped, and the process proceeds to Step 15.

  In step 15, the control unit 60 stops the inverter control by the inverter device 6 and proceeds to step 16.

  In step 16, the control unit 60 transmits an abnormality alarm signal to a monitoring center or the like, and proceeds to step 17.

  In step 17, the control unit 60 performs control so that the motor 20 cannot be restarted, and the process ends.

  Note that the control unit 60 always detects the three-phase drive current output from the inverter device 6 to the motor 20 to determine whether or not the motor torque performed by the control unit 60 has reached the upper limit value or the lower limit value. The torque value is determined based on the drive current value.

(4) Effect According to the present embodiment, when the escalator 10 is stopped, when the passenger (load) more than expected is on the step 30, or when the braking torque of the electromagnetic brake 21 is not normal, the step 30 When the shaft sensor 19 detects the lowering, the control unit 60 generates torque on the motor 20 based on the output from the inverter device 6 to supplement the braking torque of the electromagnetic brake 21 and prevent the step 30 from lowering. .

  Moreover, the control part 60 can confirm and adjust the braking torque of the electromagnetic brake 21 at the time of a subsequent inspection by transmitting an inspection signal to the outside. For this reason, the safety of the escalator 10 is maintained, and the risk of stopping for a long time can be reduced because the operation does not require urgency.

  Further, the control unit 60 promptly reduces the load on the step 30 by prompting passengers to move by voice after stopping the step 30, and can quickly return to a state where the step 30 can be held only by the electromagnetic brake 21. Can hold state.

  Further, even when the load on the step 30 varies, the control unit 60 always monitors the behavior of the rotating shaft and accordingly increases or decreases the output from the inverter device 6, thereby increasing the load on the step 30. Optimal holding torque can be obtained.

  Further, since the control unit 60 generates torque of the motor 20 with the electromagnetic brake 21 being operated, even if a passenger's load fluctuation occurs after the stop of the step 30, the rotating shaft always has the electromagnetic brake 21. The braking torque is applied, and the load on the rotating shaft is not excessively changed, and the movement of the step 30 can be kept to a minimum during the control for adjusting the torque.

  In addition, by providing an upper limit value for the output from the inverter device 6, even if the torque of the motor 20 that supplements the braking torque reaches the limit point, the ratchet device 23 can be operated to ensure that the stop can be reliably maintained. is there.

  In addition, the escalator 10 can be stopped while maintaining a safe state even under conditions of use at the time of congestion, or when an adjustment error or omission of confirmation occurs during maintenance. At this time, since the escalator 10 does not become impossible to restart until the torque of the motor 20 that supplements the braking torque reaches the limit point, the escalator 10 can be operated again, thereby improving the transportation and safety of passengers. Can be compatible.

(5) Modification Examples In each of the above embodiments, the escalator 10 has been described, but it may be implemented on a moving walk instead.

  Moreover, although the axis sensor 19 was implemented with the pulse generator, you may use sensors other than this.

  Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

6 ... Inverter device, 10 ... Escalator, 19 ... Axis sensor, 20 ... Motor, 21 ... Brake, 23 ... Ratchet device, 24 ... Drive sprocket, 30 ... Step, 60 ... Control unit

Claims (10)

A plurality of steps going up or down;
A step chain in which a plurality of the steps are connected;
A drive sprocket for rotating the step chain;
A motor that rotates the drive sprocket so that the step moves in the up or down direction;
An inverter device that outputs a drive current to the motor using a voltage from an AC power source and performs inverter control of the torque of the motor;
An electromagnetic brake for stopping the rotating shaft of the motor;
An axis sensor for detecting a rotation direction of the rotation axis;
After the motor is stopped by operating the electromagnetic brake, when the shaft sensor detects the rotation of the rotating shaft in the downward direction, the rotating shaft is operated using the inverter device while the electromagnetic brake is operated. A control unit that starts inverter control of the motor so that torque for rotation in the upward direction of the motor is output, and increases the torque until rotation in the downward direction of the rotary shaft stops;
With passenger conveyor. The controller is
If the shaft sensor does not detect the rotation of the rotating shaft after the rotating shaft is stopped, the torque is maintained,
When the shaft sensor detects rotation in the upward direction of the rotating shaft after the rotating shaft is stopped, the torque is decreased,
If the shaft sensor detects rotation in the downward direction of the rotating shaft after stopping the rotating shaft, the torque is increased.
The passenger conveyor according to claim 1. The control unit stops the rotation of the rotary shaft only by the electromagnetic brake when the torque is decreased from a predetermined lower limit value.
The passenger conveyor according to claim 2. The control unit operates a blocking device that blocks rotation of the drive sprocket when the torque exceeds a predetermined upper limit.
The passenger conveyor according to claim 2. When the blocking device is operated, the control unit notifies an alarm to the outside, and disables the restart of the motor.
The passenger conveyor according to claim 4. The blocking device is a ratchet device;
The passenger conveyor according to claim 4. The control unit notifies an inspection signal to the outside after the rotation shaft is stopped.
The passenger conveyor according to claim 1. The control unit performs a notification that prompts the passenger on the step to move,
The passenger conveyor according to claim 1. The axis sensor is a pulse generator provided on the rotating shaft;
The passenger conveyor according to claim 1. The passenger conveyor is an escalator or a moving sidewalk.
The passenger conveyor according to claim 1.

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