JP2011046474A - Overload preventive device of passenger conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overload preventive device of a passenger conveyor capable of preventing an overload on the passenger conveyor without wastefully restricting the use of the passenger conveyor. <P>SOLUTION: The overload preventive device of the passenger conveyor includes an alarm generation device provided on or in the vicinity of the passenger conveyor, a detection device which detects a current flowing in a motor for driving the passenger conveyor and detects a load on the motor based on the current flowing in the motor, and an alarm control device which calculates the estimated load of the motor in future based on the load on the motor detected by the detection device and the increasing rate of the load on the motor, and determines whether an alarm is generated by the alarm generation device based on the estimated load in future. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a passenger conveyor overload prevention device.

  When the detected motor current value exceeds a preset current threshold, the conventional passenger conveyor overload prevention device issues a warning to a user who is about to enter the passenger conveyor. This prevents a failure of the drive device due to overloading of the passenger conveyor. For this reason, a sudden stop of a passenger conveyor is prevented, and it can prevent that a user falls down beforehand. Furthermore, when the motor current value increases despite issuing an alarm, it has also been proposed to slowly stop the passenger conveyor or to reduce the speed of the passenger conveyor using an inverter (for example, patents). Reference 1).

Japanese Patent Laid-Open No. 5-124787

  However, in the device described in Patent Document 1, when the preset current threshold is close to the allowable limit, the device has already become abnormal when a warning is issued, and the passenger conveyor suddenly stops, so that the original purpose cannot be achieved. There was a problem. In addition, if the current threshold is lowered to avoid this, there is a problem that the use of the passenger conveyor is suppressed and the transportation efficiency of the passenger conveyor is reduced by frequently issuing a warning even in a load state where the apparatus has a margin. It was.

  This invention was made in order to solve the above-mentioned subject, The objective is a passenger who can prevent that an overload is applied to a passenger conveyor, without suppressing utilization of a passenger conveyor. It is to provide an overload prevention device for a conveyor.

  An overload prevention device for a passenger conveyor according to the present invention detects a current flowing through a passenger conveyor or an alarm generating device provided in the vicinity of the passenger conveyor, and a motor that drives the passenger conveyor, and is based on the current flowing through the motor. Then, based on the detection device that detects the load of the motor, the load of the motor detected by the detection device and the increase rate of the load of the motor, a future predicted load of the motor is calculated, and the future load And an alarm control device that determines whether or not the alarm generation device generates an alarm based on a predicted load.

  According to this invention, it is possible to prevent the passenger conveyor from being overloaded without suppressing the use of the passenger conveyor.

It is a whole block diagram of the overload prevention apparatus of the passenger conveyor in Embodiment 1 of this invention. It is a side view of the passenger conveyor in which the overload prevention apparatus of the passenger conveyor in Embodiment 1 of this invention is utilized. It is a figure for demonstrating the overload prediction method of the overload prevention apparatus of the passenger conveyor in Embodiment 1 of this invention.

  A mode for carrying out the invention will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

Embodiment 1 FIG.
1 is an overall configuration diagram of an overload prevention device for a passenger conveyor according to Embodiment 1 of the present invention.
In FIG. 1, reference numeral 1 denotes a motor for a passenger conveyor drive. The motor 1 has a function of driving a passenger conveyor. Steps (not shown) are circulated and moved in the longitudinal direction of the passenger conveyor by the driving force of the motor 1. Thereby, the user can move in the longitudinal direction of the passenger conveyor by getting on the step from one of the upper and lower entrances (not shown), and can reach the other of the upper and lower entrances. .

  2 is an alarm generating device. This alarm generation device 2 is provided in the passenger conveyor or in the vicinity of the passenger conveyor. The alarm generation device 2 has a function of generating an alarm to a passenger conveyor user by voice or display. Specifically, the alarm generation device 2 has a function of giving a warning to a user who tries to get into the passenger conveyor by voice or display, or a guidance for refraining from using the passenger conveyor. 3 is a timing device. This timing device 3 is provided on a control panel of a passenger conveyor. This timing device 3 has a function of outputting a trigger signal at a preset detection interval.

  4 is a load detection device. The load detection device 4 is provided on a control panel of a passenger conveyor. The load detection device 4 has a function of detecting the load of the motor 1 in response to each trigger signal output from the timing device 3. Specifically, the load detection device 4 detects a current flowing through the motor 1. Here, the load of the motor 1 is proportional to the current in phase with the input voltage of the motor 1. That is, the load detection device 4 has a function of detecting the load of the motor 1 based on the current flowing through the motor 1. Thereby, the load of a passenger conveyor is detected.

  Reference numeral 5 denotes an alarm control device. The alarm control device 5 is provided on a control panel of a passenger conveyor. The alarm control device 5 includes an overload prediction device 6. The overload prediction device 6 responds to the previous trigger signal of the adjacent trigger signals from the load of the motor 1 detected by the load detection device 4 in response to the subsequent trigger signal of the adjacent trigger signals. The load detection device 4 has a function of subtracting the load of the motor 1 and calculating the increase / decrease amount of the load of the motor 1.

  Further, when the load on the motor 1 increases, the overload prediction device 6 has a function of dividing the increase amount of the load on the motor 1 by the time corresponding to the detection interval to calculate the time increase rate of the load on the motor 1. Prepare. Further, the overload prediction device 6 has a function of calculating a future predicted load of the motor 1 based on the load of the motor 1 and its time increase rate.

  In the present embodiment, the alarm control device 5 determines whether or not to cause the alarm generation device 2 to generate an alarm based on the predicted future load of the motor 1 calculated by the overload prediction device 6. If the alarm control device 5 determines that the alarm generation device 2 generates an alarm, the alarm control device 5 outputs an alarm signal to the alarm generation device 2. Upon receiving this alarm signal, the alarm generating device 2 generates an alarm.

Next, the time increase / decrease rate of the load of the motor 1 calculated by the overload prediction device 6 will be described with reference to FIG.
FIG. 2 is a side view of a passenger conveyor in which the passenger conveyor overload prevention device according to Embodiment 1 of the present invention is used.

  In FIG. 2, 7 is a passenger conveyor. Specifically, the passenger conveyor 7 is composed of an escalator having an inclined portion. Reference numeral 8 denotes a boarding port for the passenger conveyor 7. Reference numeral 9 denotes an exit of the passenger conveyor 7. The passenger conveyor 7 in FIG. 2 is in the ascending operation. That is, the lower entrance / exit of the passenger conveyor 7 becomes the entrance 8. On the other hand, the upper entrance of the passenger conveyor 7 becomes the exit 9.

Here, at the current time T0, the gravitational acceleration is g, the initial total mass corresponding to all users riding on the steps of the passenger conveyor 7 is M, the rising speed of the passenger conveyor 7 is V, the slope of the passenger conveyor 7 is The inclination angle is θ. In this case, when simplified except for mechanical loss, the load F0 of the motor 1 is expressed by the following equation (1).
F0 = g.M.V.sin.theta. (1)

  By the way, when the user gets into the passenger conveyor 7 from the boarding port 8, the total mass corresponding to all the users on the step is obtained by adding the initial total mass M to the mass m1 corresponding to the boarded user. It becomes. On the other hand, when the user gets off at the exit 9, the total mass corresponding to all users on the step is obtained by subtracting the mass m2 corresponding to the user who got off from the initial total mass M. . As described above, the total mass corresponding to all the users on the step is constantly changing. In other words, the load on the passenger conveyor is different from the load on the elevator and changes every moment.

  And the load of the motor 1 also changes following the change of the total mass corresponding to all the users riding on the step. Here, the load of the motor 1 at time T1 before the time ΔT corresponding to the detection interval from the current time T0 is F1. In this case, the load increase / decrease amount of the motor 1 from the time T1 to the current time T0 is represented by (F0−F1). Moreover, the time increase / decrease rate of the load of the motor 1 is represented by (F0−F1) / ΔT.

  On the other hand, T is the time until the step of the entrance 8 reaches the exit 9. This time T is obtained in advance from the stroke and speed of the passenger conveyor 7. Moreover, let the allowable load of the passenger conveyor 7 be Fm. This allowable load Fm is obtained in advance in consideration of the overload capability of the motor 1. In this case, the comparative increase amount of the load of the motor 1 from the current time T0 to the time after the time T is represented by (Fm−F0). The allowable time increase rate of the load of the motor 1 is represented by (Fm−F0) / T.

Therefore, in order to prevent the load on the motor 1 from exceeding the allowable load Fm in the future, the time increase / decrease rate of the load on the motor 1 needs to satisfy the following equation (2).
(F0−F1) / ΔT <(Fm−F0) / T (2)

  It should be noted that the time ΔT corresponding to the detection interval is arbitrarily set depending on design. For example, taking into account the speed of the passenger conveyor 7, the time ΔT corresponding to the detection interval may be set to a time at which a few steps at the entrance / exit pass. Further, the time ΔT corresponding to the detection interval may be set to about 1/10 of the time T until the step of the entrance 8 reaches the exit 9. If the time ΔT is set in this way, there is no problem in calculating the future predicted load of the motor 1.

Next, control of the alarm generation device 2 by the alarm control device 5 will be described with reference to FIG.
FIG. 3 is a diagram for explaining an overload prediction method of the passenger conveyor overload prevention apparatus according to Embodiment 1 of the present invention.

  FIG. 3 is a graph showing the load relationship of the motor 1 described in FIG. Here, the horizontal axis of FIG. 3 represents time, and the vertical axis represents the load of the motor 1. In FIG. 3, T0, T1, TF0, F1, and Fm are the same as those in FIG. Reference numeral 10 denotes an allowable load line. 11 is a critical load line. Reference numeral 12 denotes a predicted load line.

  As described in FIG. 2, the load at the current time T0 is F0. If the load of the motor 1 does not reach the allowable load Fm before time T, the motor 1 is not overloaded. That is, the critical load line 11 is represented by a straight line connecting the (T0, F0) point and the (T, Fm) point on the coordinate axis.

  On the other hand, the overload prediction device 6 obtains, as the predicted load line 12, a line obtained by extending a straight line connecting the (T0, F0) point and the (T1, F1) point on the coordinate axis. Based on the predicted load line 12, the overload prediction device 6 determines whether or not the future predicted load of the motor 1 is overloaded.

  In FIG. 3, it can be seen that the predicted load line 12 intersects the allowable load line 10 before time T. Thereby, the overload prediction device 6 determines that the motor 1 is in an overload state before the time T. In this case, the alarm controller 5 outputs an alarm signal to the alarm generator 2 to generate an alarm. Due to the occurrence of this alarm, a person in the vicinity of the passenger conveyor 7 refrains from using the passenger conveyor 7.

  On the other hand, when the predicted load line (not shown) crosses the allowable load line 10 after the time T, or decreases with time, the overload prediction device 6 determines the motor before the time T. It is determined that 1 is not overloaded. In this case, the alarm controller 5 does not output an alarm signal to the alarm generator 2 and does not generate an alarm. Thereby, utilization of the passenger conveyor 7 is not restrained by this.

  According to the first embodiment described above, the alarm control device 5 calculates the future predicted load of the motor 1 based on the load of the motor 1 detected by the load detection device 4 and its time increase rate. Based on the predicted future load, it is determined whether or not the alarm generation device 2 generates an alarm. Specifically, the alarm control device 5 calculates the time increase rate of the load of the motor 1 by dividing the increase amount of the load of the motor 1 by the time corresponding to the detection interval.

  For this reason, only in the case where an overload of the passenger conveyor 7 is predicted in the future, before the passenger conveyor 7 is actually overloaded, an alarm is generated using the alarm generator 2 with a margin. Can do. That is, it is possible to prevent the passenger conveyor 7 from being overloaded without restricting the use of the passenger conveyor 7.

  Further, the alarm control device 5 calculates the allowable time increase rate by subtracting the load of the motor 1 detected by the load detection device 4 when responding to the subsequent trigger signal of the adjacent trigger signals from the allowable load Fm. To do. The alarm control device 5 causes the alarm generation device 2 to generate an alarm when the time increase rate of the load of the motor 1 is larger than the allowable time increase rate. For this reason, the overload of the passenger conveyor 7 can be predicted with a simple configuration.

  The alarm control device 5 calculates the average time increase rate by dividing the sum of the time increase rates of the load of the motor 1 corresponding to each detection interval by the number of consecutive detection intervals, and calculates the average time When the increase rate is larger than the allowable time increase rate, the alarm generation device 2 may be configured to generate an alarm. In this case, the future predicted load of the motor 1 can be calculated more accurately.

  Further, the load of the motor 1 detected by the load detection device 4 when the alarm control device 5 compares the time increase rate of the load of the motor 1 with the allowable time increase rate in response to a later trigger signal is preset. It is good also as a structure performed when the threshold value exceeded. In this case, it is possible to prevent the alarm control device 5 from performing a useless calculation operation in a situation where the future predicted load of the motor 1 cannot be overloaded.

  Furthermore, in Embodiment 1, it demonstrated by the case where an overload prevention apparatus is utilized for an escalator. However, the same effect as described above can be obtained even if the overload prevention device is used on a moving sidewalk with no inclination.

1 motor, 2 alarm generator, 3 timing device, 4 load detector,
5 alarm control device, 6 overload prediction device, 7 passenger conveyor, 8 boarding gate,
9 Exit, 10 Allowable load line, 11 Critical load line, 12 Predicted load line

Claims (5)

An alarm generator provided in the vicinity of the passenger conveyor or the passenger conveyor;
Detecting a current flowing in a motor driving the passenger conveyor, and detecting a load of the motor based on a current flowing in the motor;
Based on the load of the motor detected by the detection device and the rate of increase in the load of the motor, a future predicted load of the motor is calculated, and an alarm is issued to the alarm generation device based on the predicted future load. An alarm control device for determining whether or not to generate, and
An overload prevention device for a passenger conveyor, comprising: Provided with a timing device that outputs a trigger signal at a preset detection interval,
The alarm control device responds to a previous trigger signal of the adjacent trigger signals from a load of the motor detected by the detection device in response to a later trigger signal of the adjacent trigger signals. The amount of increase in the load of the motor is calculated by subtracting the load of the motor detected by the detection device,
2. The overload prevention device for a passenger conveyor according to claim 1, wherein an increase rate of the load of the motor is calculated by dividing an increase amount of the load of the motor by a time corresponding to the detection interval. The alarm control device calculates a comparative increase amount of the load of the motor by subtracting the load of the motor detected by the detection device in response to the subsequent trigger signal from a preset allowable load,
Dividing the comparative increase amount by the time set as the time until the step at the boarding entrance of the passenger conveyor reaches the exit of the passenger conveyor to calculate an allowable increase rate,
The overload prevention device for a passenger conveyor according to claim 2, wherein when the rate of increase of the load of the motor is larger than the allowable rate of increase, the alarm generation device generates an alarm. The alarm control device calculates an increase rate of the load of the motor for each of a plurality of consecutive detection intervals,
By dividing the sum of the increase rates of the load of the motor corresponding to each of the detection intervals by the number of the continuous detection intervals, an average increase rate is calculated,
4. The passenger conveyor overload prevention device according to claim 3, wherein when the average increase rate is greater than the allowable increase rate, the alarm generation device generates an alarm.   The alarm control device compares the increase rate of the load of the motor with the allowable increase rate, and the threshold of the motor load detected by the detection device when the response to the subsequent trigger signal is set in advance. The overload prevention device for a passenger conveyor according to any one of claims 2 to 4, wherein the overload prevention device is performed when the value exceeds.

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