JP6565781B2 - Elevator door open / close diagnosis system - Google Patents

Description

  The present invention relates to an elevator door open / close diagnosis system.

  2. Description of the Related Art Conventionally, there is known a technique capable of detecting a door opening / closing abnormality by comparing a time required for opening and closing an elevator door with a torque lower than that during normal operation with a reference value. As such a technique, for example, there is one described in Patent Document 1 below.

JP-A-8-85689

  In the technique as described above, a sign of a door opening / closing abnormality cannot be detected in a state where no door opening / closing abnormality has occurred.

  The present invention has been made to solve the above problems. The purpose is to provide an elevator door opening / closing diagnosis system capable of detecting signs of door opening / closing abnormality.

  The elevator door opening / closing diagnosis system according to the present invention generates a door opening / closing abnormality by comparing the time required to open and close the door with a normal diagnosis torque lower than that during normal operation when checking the elevator door. A normal diagnosis unit that performs a normal diagnosis to determine whether or not the door is open and open and the door is opened and closed with a torque lower than the normal diagnosis torque when the normal diagnosis unit determines that no door opening / closing abnormality has occurred. A low torque diagnosis unit that performs low torque diagnosis that compares a required time with a reference value, and a diagnosis result storage unit that stores a result of low torque diagnosis by the low torque diagnosis unit in association with torque in the low torque diagnosis.

  In the present invention, the low torque diagnosis unit performs the low torque diagnosis when the normal diagnosis unit determines that the door opening / closing abnormality has not occurred. The diagnosis result storage unit stores the result of the low torque diagnosis by the low torque diagnosis unit in association with the torque in the low torque diagnosis. For this reason, it is possible to detect a sign of a door opening / closing abnormality.

It is a schematic diagram which shows an example of the structure of an elevator. It is a front view of the door device of an elevator. It is a block diagram which shows an example of the door opening / closing diagnostic system of the elevator in Embodiment 1. FIG. FIG. 5 is a diagram for explaining low torque diagnosis performed continuously in the first embodiment. 3 is a flowchart illustrating an operation example of the door control device in the first embodiment. It is a hardware block diagram of a door control apparatus.

  The present invention will be described in detail with reference to the accompanying drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals. The overlapping description will be simplified or omitted as appropriate.

Embodiment 1 FIG.
Drawing 1 is a mimetic diagram showing an example of the structure of an elevator.

  As shown in FIG. 1, the elevator 1 includes a hoistway 2, a hoisting machine 3, a rope 4, a car 5, and a counterweight 6. The hoistway 2 is formed, for example, so as to penetrate each floor of a building (not shown). The hoisting machine 3 is provided, for example, in a machine room (not shown). The rope 4 is wound around the hoisting machine 3. The car 5 and the counterweight 6 are suspended in the hoistway 2 by the rope 4. The car 5 and the counterweight 6 move up and down when the hoisting machine 3 is driven.

  As shown in FIG. 1, the elevator 1 includes a car door 7, a landing door 8, and a door control device 9. The car door 7 is attached to a car-side door device (not shown in FIG. 1). The landing door 8 is attached to a landing-side door device (not shown in FIG. 1). The door control device 9 is provided on the upper part of the car 5, for example. Hereinafter, the car door 7 and the landing door 8 are also simply referred to as a “door”.

  FIG. 2 is a front view of an elevator door device. FIG. 2 shows a state in which the door device provided in the car 5 is viewed from the landing side as an example. FIG. 2 shows a double door device as an example.

  As shown in FIG. 2, the door device includes a motor 10, a transmission belt 11, a transmission pulley 12, an opening / closing pulley 13, an opening / closing belt 14, a door rail 15, a door hanger 16, a hanger roller 17, and a connector 18. ing.

  The motor 10 is electrically connected to the door control device 9. The transmission belt 11 is wound around the rotation shaft of the motor 10 and the transmission pulley 12. A plurality of opening / closing pulleys 13 are provided. One of the opening / closing pulleys 13 is fixed to the same rotating shaft as the transmission pulley 12. The opening / closing belt 14 is wound around all the opening / closing pulleys 13.

  The door rail 15 is provided along the left-right direction when the car 5 is viewed from the front. A car door 7 is fixed to the lower part of the door hanger 16. A hanger roller 17 is provided on the upper portion of the door hanger 16. The hanger roller 17 is supported by the door rail 15. That is, the car door 7 is supported by the door rail 15 via the door hanger 16 and the hanger roller 17. The hanger roller 17 is provided to be rotatable with respect to the door hanger 16. The hanger roller 17 can move left and right on the door rail 15.

  The door hanger 16 is connected to the opening / closing belt 14 by a connecting tool 18. When the motor 10 is driven, torque is transmitted to the door hanger 16 via the transmission belt 11, the transmission pulley 12, the opening / closing pulley 13, the opening / closing belt 14, and the connecting tool 18. With this torque, the car door 7 fixed to the door hanger 16 is opened and closed. The landing door 8 is opened and closed in conjunction with the opening and closing of the car door 7.

  FIG. 3 is a configuration diagram illustrating an example of an elevator door opening / closing diagnosis system according to the first embodiment.

  As shown in FIG. 3, the door opening / closing diagnosis system includes a door control device 9, an elevator control device 19, a remote monitoring device 20, and an information center 21. The door control device 9 includes a normal diagnosis unit 22, a notification unit 23, a low torque diagnosis unit 24, a diagnosis presence / absence determination unit 25, and a diagnosis result storage unit 26. The elevator control device 19 and the remote monitoring device 20 are provided, for example, in a building where the elevator 1 is installed. The information center 21 is provided in a building different from the building where the elevator 1 is installed, for example. The information center 21 is, for example, a server provided in a management company for the elevator 1.

  The elevator control device 19 is electrically connected to the hoisting machine 3, the door control device 9 and the remote monitoring device 20. The remote monitoring device 20 has a function of communicating with the information center 21. Communication between the remote monitoring device 20 and the information center 21 may be wired communication or wireless communication.

  For example, the elevator control device 19 controls the movement of the car 5 by driving the hoisting machine 3. For example, the remote monitoring device 20 transmits information acquired from the door control device 9 and the elevator control device 19 to the information center 21. The information center 21 stores information received from the remote monitoring device 20, for example.

  The door control device 9 controls the opening and closing of the door by controlling the operation of the motor 10. For example, the door control device 9 changes the opening / closing speed of the door by changing the torque generated by the motor 10.

  The normal diagnosis unit 22 performs “normal diagnosis” when checking the door of the elevator 1. In the normal diagnosis, it is determined whether or not a door opening / closing abnormality has occurred by comparing a time required to open and close the door with a torque lower than that during normal operation of the elevator 1 with a preset reference value. That is. The normal diagnosis is performed on all floors where the car 5 of the elevator 1 can be stopped, for example. Hereinafter, the torque in the normal diagnosis is also referred to as “normal diagnosis torque”. The normal diagnosis torque is set in advance for each model of the elevator 1 or each building where the elevator 1 is installed, for example.

  For example, the normal diagnosis unit 22 determines that the door opening / closing abnormality has not occurred when the time required to open and close the door with the normal diagnosis torque is smaller than or less than the reference value. For example, the normal diagnosis unit 22 determines that a door opening / closing abnormality has occurred when the time required to open and close the door with the normal diagnosis torque is equal to or greater than a reference value or greater than the reference value.

  When the normal diagnosis unit 22 determines that a door opening / closing abnormality has occurred, the notification unit 23 issues an abnormality notification. The abnormality notification is to transmit information indicating that a door opening / closing abnormality has occurred to the information center 21 via the remote monitoring device 20.

  The low torque diagnosis unit 24 has a function of performing “low torque diagnosis” when checking the door of the elevator 1. The low torque diagnosis means that when the normal diagnosis unit 22 determines that the door opening / closing abnormality has not occurred, the time required to open / close the door with a torque lower than the normal diagnosis torque is compared with a reference value. is there. The low torque diagnosis is performed, for example, on all floors where the door 5 is not abnormal among the floors where the car 5 of the elevator 1 can be stopped. That is, the low torque diagnosis is performed for each landing door 8, for example. Note that when the normal diagnosis unit 22 determines that a door opening / closing abnormality has occurred, the low torque diagnosis is not performed.

  The reference value in the low torque diagnosis is the same as the reference value in the normal diagnosis. That is, it is determined by the low torque diagnosis whether or not the door can be normally opened and closed with a torque smaller than the normal diagnosis torque in a state where no door opening / closing abnormality has occurred. The low torque diagnosis unit 24 determines that the diagnosis result is good when the time required to open and close the door with a torque smaller than the normal diagnosis torque is smaller than or less than the reference value. The low torque diagnosis unit 24 determines that the diagnosis result is not good when the time required to open and close the door with a torque smaller than the normal diagnosis torque is equal to or greater than the reference value or greater than the reference value.

  The low torque diagnosis unit 24 has a function of continuously performing low torque diagnosis a plurality of times while changing the torque for each low torque diagnosis. The upper limit of the number of times the low torque diagnosis is continuously performed is set in advance, for example. Hereinafter, the torque in the last low torque diagnosis among a plurality of consecutive low torque diagnoses is also referred to as “final torque”.

  The diagnosis presence / absence determination unit 25 determines whether or not there is a next low torque diagnosis every time the low torque diagnosis is completed once, for example, when a plurality of low torque diagnosis is continuously performed.

  The diagnosis result storage unit 26 stores the result of the low torque diagnosis by the low torque diagnosis unit 24. For example, the diagnosis result storage unit 26 stores the result of the low torque diagnosis for each landing door 8. The diagnosis result storage unit 26 stores at least the result of the last low torque diagnosis when a plurality of times of low torque diagnosis are continuously performed. The diagnosis result storage unit 26 stores the torque in the low torque diagnosis, the execution date of the low torque diagnosis, and the like in association with the result of the low torque diagnosis, for example. The information stored in the diagnosis result storage unit 26 is transmitted to the information center 21 via the remote monitoring device 20, for example.

  Hereinafter, the fact that the door opening / closing abnormality has not occurred and the result of the low torque diagnosis is good may be expressed as “diagnosis result is OK”. Moreover, it may be expressed as “diagnosis result is NG” that the door opening / closing abnormality has occurred and that the result of the low torque diagnosis is not good.

  FIG. 4 is a diagram for explaining low-torque diagnosis performed continuously in the first embodiment.

  In FIG. 4, the horizontal axis represents time, and the vertical axis represents torque. The position in the vertical axis direction of the horizontal line in the figure indicates the torque in the normal diagnosis or the low torque diagnosis. In FIG. 4, the value of the normal diagnostic torque is represented by x. FIG. 4 shows, as an example, a case where the upper limit number of times that low torque diagnosis is continuously performed is five. In this case, as a general rule, the inspection from the first low torque diagnosis to the fifth low torque diagnosis is sequentially performed after the normal diagnosis in which the diagnosis result is OK for one door inspection.

  The arrows in FIG. 4 indicate torque changes. The low torque diagnosis next to the normal diagnosis or the low torque diagnosis in which the diagnosis result is OK is performed with the torque changed according to the downward arrow. The low torque diagnosis next to the low torque diagnosis in which the diagnosis result is NG is performed with the torque changed according to the upward arrow. That is, the torque in the low torque diagnosis rises or falls according to the result of the low torque diagnosis performed immediately before the low torque diagnosis.

  As shown in FIG. 4, as the second low torque diagnosis, one of the second low torque diagnosis a and the second low torque diagnosis b is performed. As the third low torque diagnosis, any one of the third low torque diagnosis a to the third low torque diagnosis d is performed. As the fourth low torque diagnosis, any one of the fourth low torque diagnosis a to the fourth low torque diagnosis h is performed. As the fifth low torque diagnosis, any one of the fifth low torque diagnosis a to the fifth low torque diagnosis p is performed.

  The length of the arrow in FIG. 4 corresponds to the torque change amount. As shown in FIG. 4, the torque in the first low torque diagnosis is half of the normal diagnosis torque x. That is, the amount of torque change between the normal diagnosis and the first low torque diagnosis is half of x.

  As shown in FIG. 4, the amount of torque change between the first low torque diagnosis and the second low torque diagnosis is ¼ of x. That is, the torque change amount between the first low torque diagnosis and the second low torque diagnosis is one half of the torque change amount between the normal diagnosis and the first low torque diagnosis.

  As shown in FIG. 4, the amount of torque change between the second low torque diagnosis and the third low torque diagnosis is 1/8 of x. The torque change amount between the third low torque diagnosis and the fourth low torque diagnosis is 1/16 of x. The amount of torque change between the fourth low torque diagnosis and the fifth low torque diagnosis is 1/32 of x. That is, the torque change amount between the second low torque diagnosis and the third low torque diagnosis among the arbitrary three consecutive low torque diagnoses is the first low torque diagnosis and the second low torque diagnosis. Is half of the amount of torque change between the two.

  The diagnosis result storage unit 26 stores at least the result of the fifth low torque diagnosis from the first low torque diagnosis to the fifth low torque diagnosis. The diagnosis result storage unit 26 stores, for example, the torque in the fifth low torque diagnosis, the implementation date of the fifth low torque diagnosis, and the like in association with the result of the fifth low torque diagnosis. In the example shown in FIG. 4, the torque in the fifth low torque diagnosis is the final torque. In the example shown in FIG. 4, a low final torque means that the door is opened and closed smoothly.

  The low torque diagnosis unit 24 may omit a part of the continuous low torque diagnosis based on the final torque at the previous inspection stored in the diagnosis result storage unit 26. For example, the low torque diagnosis unit 24 may omit the low torque diagnosis less than the upper limit number of times among the upper limit number of low torque diagnosis units. Hereinafter, a specific example of omitting the low torque diagnosis will be described.

  For example, when the final torque at the previous inspection is the torque at the fifth low torque diagnosis i, the final torque at the current inspection is the torque at the fifth low torque diagnosis h to the torque at the fifth low torque diagnosis a. Presumed to be either. That is, it is estimated that there is a high possibility that the result of the first low torque diagnosis is NG. In this case, the low torque diagnosis unit 24 may omit the first low torque diagnosis and execute the second low torque diagnosis a after the normal diagnosis.

  For example, when the final torque at the time of the previous inspection is the torque at the fifth low torque diagnosis e, the final torque at the time of the current inspection is the torque from the torque at the fifth low torque diagnosis a to the torque at the fifth low torque diagnosis d. Presumed to be either. That is, it is estimated that there is a high possibility that the result of the first low torque diagnosis is NG and the result of the second low torque diagnosis a is also NG. In this case, the low torque diagnosis unit 24 may omit the first low torque diagnosis and the second low torque diagnosis and perform the third low torque diagnosis a after the normal diagnosis.

  For example, if the final torque at the previous inspection is the torque at the fifth low torque diagnosis n, the final torque at the current inspection is the torque at the fifth low torque diagnosis m from the torque at the fifth low torque diagnosis a. Presumed to be either. If all the torque from the torque in the fifth low torque diagnosis a to the torque in the fifth low torque diagnosis m is left as the possibility of the final torque, the first low torque diagnosis cannot be omitted. In this case, for example, the first low torque diagnosis may be omitted if the range that can be the final torque of this time can be narrowed based on the inspection execution interval or the type of the elevator 1. In this case, for example, if the low torque diagnosis to be performed next to the normal diagnosis is set in advance at the current inspection in accordance with the final torque at the previous inspection, the first low torque diagnosis may be omitted. Good.

  As described above, the low torque diagnosis unit 24 can omit a part of the continuous low torque diagnosis. However, for example, when a door maintenance operation has been performed between the previous inspection and the present time, the low torque diagnosis unit 24 does not omit a part of the low torque diagnosis. Whether or not the door maintenance work has been performed may be determined based on, for example, a log stored in the door control device 9, the elevator control device 19, the remote monitoring device 20, the information center 21, or the like.

  FIG. 5 is a flowchart illustrating an operation example of the door control device according to the first embodiment.

  The normal diagnosis unit 22 performs normal diagnosis (step S101), and determines whether or not the diagnosis result of the normal diagnosis is OK (step S102). When it determines with a diagnostic result being NG in step S102, the alerting | reporting part 23 performs abnormality notification (step S103). When the process of step S103 is performed, the low torque diagnosis unit 24 does not perform the low torque diagnosis.

  When it is determined in step S102 that the diagnosis result is OK, the low torque diagnosis unit 24 performs a low torque diagnosis by reducing the torque (step S104). Subsequent to step S104, the low torque diagnosis unit 24 determines whether or not the diagnosis result is OK (step S105). When it is determined in step S105 that the diagnosis result is OK, the diagnosis presence / absence determination unit 25 determines whether or not there is a next low torque diagnosis (step S106). If it is determined in step S106 that there is a next low torque diagnosis, the low torque diagnosis unit 24 performs the process of step S104.

  When it is determined in step S105 that the diagnosis result is NG, the diagnosis presence / absence determination unit 25 determines whether or not there is a next low torque diagnosis (step S107). When it is determined in step S107 that there is a next low torque diagnosis, the low torque diagnosis unit 24 performs a low torque diagnosis by increasing the torque (step S108). Subsequent to step S108, the low torque diagnosis unit 24 determines whether or not the diagnosis result is OK (step S109). When it is determined in step S109 that the diagnosis result is OK, the diagnosis presence / absence determination unit 25 performs the process of step S106. When it is determined in step S109 that the diagnosis result is NG, the diagnosis presence / absence determination unit 25 performs the process of step S107.

  When it is determined in step S106 or step S107 that there is no next low torque diagnosis, the diagnosis result storage unit 26 stores the final torque and the result of the last low torque diagnosis (step S110). When the process of step S110 is performed, the low torque diagnosis in one door inspection is completed.

  In the first embodiment, the low torque diagnosis unit 24 performs the low torque diagnosis when the normal diagnosis unit 22 determines that the door opening / closing abnormality has not occurred. The diagnosis result storage unit 26 stores the result of the low torque diagnosis in association with the torque in the low torque diagnosis. For this reason, according to the first embodiment, it is possible to detect how much torque is currently required to smoothly open and close the door in a state where no door opening / closing abnormality has occurred. Further, since the result of the low torque diagnosis and the torque in the low torque diagnosis are stored every time the door is inspected, it is possible to detect a change in the door state over time. For this reason, for example, the occurrence tendency of door opening / closing abnormalities can be derived for each door, each elevator, or each building. As a result, it is possible to detect a sign of an elevator door opening / closing abnormality. Thereby, for example, it is possible to appropriately set the execution time of the maintenance work and prevent the occurrence of door opening / closing abnormality.

  In the first embodiment, the low torque diagnosis unit 24 continuously performs a plurality of low torque diagnoses while changing the torque for each low torque diagnosis. The diagnosis result storage unit 26 stores the result of the last low torque diagnosis in association with the final torque that is the torque in the last low torque diagnosis. For this reason, according to Embodiment 1, the torque currently required in order to open and close a door smoothly can be detected with high precision. As a result, it is possible to detect a sign of an elevator door opening / closing abnormality with higher accuracy.

  In the first embodiment, the low torque diagnosis unit 24 reduces the torque in the low torque diagnosis performed after the normal diagnosis and the low torque diagnosis in which a good result is obtained, and the low torque diagnosis in which an unfavorable result is obtained. The torque is increased in the low torque diagnosis performed next. For this reason, according to Embodiment 1, the torque currently required in order to open and close a door smoothly can be detected with high precision. As a result, it is possible to detect a sign of an elevator door opening / closing abnormality with higher accuracy.

  In the first embodiment, when the low torque diagnosis unit 24 continuously performs the low torque diagnosis of the upper limit number of times, the first low torque diagnosis that is performed next to the normal diagnosis with a torque that is one half of the normal diagnosis torque. I do. The low torque diagnosis unit 24 performs a low torque that is next performed with a torque obtained by changing one half of the torque change amount between the normal diagnosis and the first low torque diagnosis from the torque in the first low torque diagnosis. Make a diagnosis. The low torque diagnosis unit 24 calculates the second torque change amount between the first low torque diagnosis and the second low torque diagnosis among the low torque diagnosis performed three times in succession. The third low torque diagnosis is performed with the torque changed from the torque in the low torque diagnosis. That is, the low torque diagnosis unit 24 sets the torque change amount to ½ for each low torque diagnosis with 1/2 of the normal diagnosis torque as an initial value. For this reason, according to the first embodiment, it is possible to detect with high accuracy the torque currently required for smoothly opening and closing the door by a simple and general technique. As a result, it is possible to detect various signs of abnormal door opening / closing of the elevator with higher accuracy regardless of the type and installation location.

  In the first embodiment, the low torque diagnosis unit 24 has a lower torque than the upper limit number of times in the low torque diagnosis of the upper limit number based on the final torque at the previous inspection stored in the diagnosis result storage unit 26. It is also possible to omit the diagnosis. As a result, it is possible to detect a sign of an abnormal door opening / closing of the elevator more efficiently.

  In the first embodiment, when a part of the continuous low torque diagnosis is omitted, the value of the final torque at the previous inspection may be used instead of the torque at the low torque diagnosis at the current inspection. However, in order to prevent the torque from becoming a negative value, the absolute value of the torque change amount cannot be omitted so as to be larger than the final torque value at the previous inspection. When the low torque diagnosis is omitted using the final torque value at the previous inspection, the final torque value and the diagnostic result at the current inspection are different in expression from the case of using the above-described omitted method. Can be a thing. However, the value of the final torque and the diagnosis result indicate that “how much torque is currently required to open and close the door smoothly” is substantially the same as when using the above-described method of omission. It is.

  In the first embodiment, the diagnosis result storage unit 26 may be provided in the elevator control device 19, the remote monitoring device 20, or the information center 21. In this case, information such as the final torque and the diagnosis result may be transmitted to other devices without being stored in the door control device 9 itself.

  FIG. 6 is a hardware configuration diagram of the door control device.

  The functions of the normal diagnosis unit 22, the notification unit 23, the low torque diagnosis unit 24, the diagnosis presence / absence determination unit 25, and the diagnosis result storage unit 26 in the door control device 9 are realized by a processing circuit. The processing circuit may be dedicated hardware 50. The processing circuit may include a processor 51 and a memory 52. A part of the processing circuit is formed as dedicated hardware 50, and may further include a processor 51 and a memory 52. FIG. 6 shows an example in which the processing circuit is partly formed as dedicated hardware 50 and includes a processor 51 and a memory 52.

  When at least a part of the processing circuit is at least one dedicated hardware 50, the processing circuit may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or the like. The combination is applicable.

  When the processing circuit includes at least one processor 51 and at least one memory 52, the functions of the normal diagnosis unit 22, the notification unit 23, the low torque diagnosis unit 24, the diagnosis presence / absence determination unit 25, and the diagnosis result storage unit 26 are software , Firmware, or a combination of software and firmware. Software and firmware are described as programs and stored in the memory 52. The processor 51 reads out and executes the program stored in the memory 52, thereby realizing the function of each unit. The processor 51 is also referred to as a CPU (Central Processing Unit), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, and a DSP. The memory 52 corresponds to, for example, a nonvolatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, an EPROM, and an EEPROM, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, and a DVD.

  Thus, the processing circuit can realize each function of the door control device 9 by hardware, software, firmware, or a combination thereof. Each function of the elevator control device 19, the remote monitoring device 20, and the information center 21 is also realized by a processing circuit similar to the processing circuit shown in FIG.

DESCRIPTION OF SYMBOLS 1 Elevator 2 Hoistway 3 Hoisting machine 4 Rope 5 Car 6 Counterweight 7 Car door 8 Landing door 9 Door control device 10 Motor 11 Transmission belt 12 Transmission pulley 13 Opening and closing pulley 14 Opening and closing belt 15 Door rail 16 Door hanger 17 Hanger roller 18 Connector 19 Elevator control device 20 Remote monitoring device 21 Information center 22 Normal diagnosis unit 23 Notification unit 24 Low torque diagnosis unit 25 Diagnosis presence / absence determination unit 26 Diagnosis result storage unit 50 Dedicated hardware 51 Processor 52 Memory

Claims (5)

When checking elevator doors, perform normal diagnosis to determine whether a door opening / closing error has occurred by comparing the time required to open and close the door with a normal diagnosis torque lower than that during normal operation. A normal diagnostic department;
When the normal diagnosis unit determines that no door opening / closing abnormality has occurred, a low torque diagnosis is performed in which the time required to open and close the door with a torque lower than the normal diagnosis torque is compared with the reference value. A torque diagnostic unit;
A diagnosis result storage unit for storing a result of low torque diagnosis by the low torque diagnosis unit in association with torque in the low torque diagnosis;
Elevator door opening / closing diagnosis system with The low torque diagnosis unit continuously performs low torque diagnosis of the number of times equal to or less than a preset upper limit number while changing the torque for each low torque diagnosis.
The elevator of claim 1, wherein the diagnosis result storage unit stores the result of the last low torque diagnosis among the continuously executed low torque diagnoses in association with the final torque that is the torque in the last low torque diagnosis. Door open / close diagnosis system.   The low torque diagnosis unit lowers the torque in the low torque diagnosis performed after the normal diagnosis and the low torque diagnosis obtained with a good result, and is performed next to the low torque diagnosis obtained with an unfavorable result. The elevator door opening / closing diagnosis system according to claim 2, wherein the torque in the low torque diagnosis is increased.   The low torque diagnosis unit performs the first low torque diagnosis performed next to the normal diagnosis with a torque that is a half of the normal diagnosis torque when continuously performing the low torque diagnosis of the upper limit number of times, The torque that is half the amount of torque change between the normal diagnosis and the first low torque diagnosis is a torque that is changed from the torque in the first low torque diagnosis, and is low after the first low torque diagnosis. Torque diagnosis is performed, and half of the amount of torque change between the first low torque diagnosis and the second low torque diagnosis among the low torque diagnosis performed three times in succession is the second low torque. The elevator door opening / closing diagnosis system according to claim 2 or 3, wherein a third low torque diagnosis is performed with a torque changed from a torque in the diagnosis.   The low torque diagnosis unit omits the low torque diagnosis less than the upper limit number among the low torque diagnosis of the upper limit number based on the final torque at the time of the previous inspection stored in the diagnosis result storage unit. The elevator door opening / closing diagnostic system according to any one of claims 2 to 4.

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