JP6191723B1 - Elevator diagnostic system - Google Patents

Abstract

An object of the present invention is to provide an elevator diagnosis system capable of diagnosing contact failure of a switch provided in an elevator hoistway. An elevator diagnosis system according to the present invention includes a switch 8 disposed in a hoistway 2 so that a contact is changed from a closed state to an open state by contact with a cam 20 attached to a car 5 of the elevator 1. The position detection unit 13 that detects the position of the car 5 when the contact of the switch from the open state to the closed state is detected as the return point of the switch 8, and the return point of the switch 8 detected by the position detection unit 13 is preset. The switch diagnosis unit 15 that determines whether or not the condition is satisfied, and when the switch diagnosis unit 15 determines that the return point of the switch 8 does not satisfy the condition, there is a possibility that a contact failure has occurred in the switch 8 And a diagnostic result storage unit 16 for storing information indicating that there is. [Selection] Figure 1

Description

  The present invention relates to an elevator diagnosis system.

  The elevator hoistway is provided with a switch that opens a contact when it comes into contact with a cam attached to the car. 2. Description of the Related Art Conventionally, a technique for diagnosing a switch abnormality based on the position of a car when such a switch contact is opened is known. As such a technique, for example, there is one described in Patent Document 1 below.

JP-A-9-249360

  With the above-described technology, it is diagnosed that the switch operates normally when it comes into contact with the cam, but it is not diagnosed that the switch returns to normal when it is separated from the cam. In other words, the above-described technique cannot diagnose contact failure of the switch contacts.

  The present invention has been made to solve the above problems. The purpose is to provide an elevator diagnosis system that can diagnose a contact failure of a switch provided in an elevator hoistway.

  In the elevator diagnosis system according to the present invention, the contact of the switch arranged in the hoistway is changed from the open state to the closed state so that the contact is changed from the closed state to the open state by contact with a cam attached to the elevator car. A position detection unit that detects the position of the car at the time of return as a return point of the switch, and a switch diagnosis unit that determines whether or not the return point of the switch detected by the position detection unit satisfies a preset condition; A diagnostic result storage unit that stores information indicating that a contact failure may occur in the switch when the switch diagnosis unit determines that the return point of the switch does not satisfy the condition. Is.

  In the present invention, the switch diagnosis unit determines whether or not the return point of the switch detected by the position detection unit satisfies a preset condition. The diagnosis result storage unit stores information indicating that a contact failure may occur in the switch when the switch diagnosis unit determines that the return point of the switch does not satisfy the condition. For this reason, the contact failure of the switch provided in the hoistway of the elevator can be diagnosed.

It is a block diagram which shows an example of the diagnostic system of the elevator in Embodiment 1 of this invention. It is a side view which shows an example of the installation state of the end point switch in a hoistway. It is an enlarged view which shows the state where the cam is not contacting the end point switch. It is an enlarged view which shows the state which the cam is contacting the end point switch. FIG. 5 is an arrow view of the end point switch viewed from the X direction shown in FIG. 4. It is a timing chart which shows the relationship between the state of the cam with respect to an end point switch, and the state of an electrical signal. 3 is a flowchart illustrating an operation example of the diagnostic system in the first embodiment. It is a hardware block diagram of a 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.
FIG. 1 is a configuration diagram illustrating an example of an elevator diagnosis system according to the first embodiment.

  As shown in FIG. 1, the elevator 1 includes a hoistway 2, a hoisting machine 3, a rope 4, a car 5, a counterweight 6, and an encoder 7. 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. The encoder 7 is attached to the motor of the hoisting machine 3.

  As shown in FIG. 1, for example, an end switch 8 is provided in the hoistway 2 as a contact type switch. The end point switch 8 includes an upper end point switch 8a and a lower end point switch 8b. The upper end switch 8 a is disposed at the upper end of the hoistway 2. The upper end switch 8a is provided at a position corresponding to the uppermost floor of the building in the hoistway 2, for example. The lower end switch 8 b is disposed at the lower end of the hoistway 2. The lower end switch 8b is provided at a position corresponding to the lowest floor of the building in the hoistway 2, for example. The lower end switch 8b is, for example, a switch having the same structure as that of the upper end switch 8a installed upside down.

  As shown in FIG. 1, the diagnostic system includes a control device 9, a remote monitoring device 10, and an information center 11. The control device 9 includes an operation control unit 12, a position detection unit 13, a position information storage unit 14, a switch diagnosis unit 15, and a diagnosis result storage unit 16. The control device 9 and the remote monitoring device 10 are provided, for example, in a building where the elevator 1 is installed. The information center 11 is provided in a building different from the building where the elevator 1 is installed, for example. The information center 11 is, for example, a server provided in a management company for the elevator 1.

  The control device 9 is electrically connected to the hoisting machine 3, the encoder 7, the end point switch 8, and the remote monitoring device 10. The remote monitoring device 10 has a function of communicating with the information center 11. Communication between the remote monitoring device 10 and the information center 11 may be wired communication or wireless communication.

  The operation control unit 12 controls the movement of the car 5 by driving the hoisting machine 3. The operation control unit 12 moves the car 5 based on, for example, operations on a car operation panel, a hall operation panel, and a maintenance terminal (not shown).

  The position detection unit 13 detects the position of the car 5 in the hoistway 2. The position of the car 5 is detected based on a signal from the encoder 7, for example. Further, the position of the car 5 may be detected based on a signal from a sensor (not shown) provided in the hoistway 2 or the car 5, for example.

  The position information storage unit 14 stores information indicating the position of the car 5 detected by the position detection unit 13. The position information storage unit 14 stores, for example, date and time associated with information indicating the position of the car 5. The position of the car 5 may be represented by, for example, a height based on the lower end portion of the hoistway 2. The position of the car 5 may be represented by, for example, a depth based on the upper end portion of the hoistway 2. The position of the car 5 may be represented by, for example, a positive value or a negative value with respect to a specific floor.

  The switch diagnosis unit 15 diagnoses the end point switch 8 based on, for example, information indicating the position detected by the position detection unit 13. For example, the switch diagnosis unit 15 diagnoses the end point switch 8 based on the information stored in the position information storage unit 14.

  The diagnosis result storage unit 16 stores the result of diagnosis by the switch diagnosis unit 15. The diagnosis result storage unit 16 stores, for example, information indicating that a contact failure may occur in the end point switch 8. The diagnosis result storage unit 16 stores, for example, information indicating that a contact failure may occur in the end point switch 8.

  The remote monitoring device 10 transmits information stored in the diagnosis result storage unit 16 to the information center 11, for example. For example, the information center 11 stores information received from the remote monitoring device 10.

  FIG. 2 is a side view showing an example of an installation state of the end point switch in the hoistway. FIG. 2 shows a case where two upper end point switches 8a and two lower end point switches 8b are provided as an example.

  As shown in FIG. 2, a guide rail 17, a mounting arm 18, and a switch support 19 are provided in the hoistway 2. The guide rail 17 is provided along the up-down direction. The car 5 moves in the hoistway 2 while being guided by the guide rail 17. One end of the mounting arm 18 is fixed to the guide rail 17. The attachment arm 18 is provided so as to be orthogonal to the longitudinal direction of the guide rail 17, for example. For example, the attachment arm 18 is provided at a position corresponding to the upper end portion and the lower end portion of the hoistway 2. The switch support 19 is attached to the other end of the attachment arm 18. For example, the upper end of the switch support 19 is fixed to the other end of the mounting arm 18 located at the upper end of the hoistway 2. The lower end portion of the switch support 19 is fixed to, for example, the other end portion of the mounting arm 18 located at the lower end portion of the hoistway 2. For example, the switch support 19 is provided so as to be orthogonal to the longitudinal direction of the mounting arm 18. The switch support 19 is provided, for example, along the vertical direction in parallel with the guide rail 17.

  As shown in FIG. 2, the end point switch 8 is attached to the switch support 19. The upper end switch 8a is disposed, for example, in the vicinity of the mounting arm 18 located at the upper end of the hoistway 2. The lower end switch 8b is disposed, for example, in the vicinity of the mounting arm 18 located at the lower end of the hoistway 2.

  As shown in FIG. 2, the car 5 has a cam 20. The cam 20 is fixed to an attachment member that extends from the side surface of the car 5 toward the switch support 19. The cam 20 has a flat portion and an inclined portion at a portion facing the switch support 19. The flat portion is formed at the center of the cam 20 in the vertical direction. The flat portion has, for example, a shape along the vertical direction in parallel with the switch support 19. The inclined portions are formed at the upper end portion and the lower end portion in the vertical direction of the cam 20. The upper inclined portion is formed so that the portion closer to the upper end of the cam 20 has a larger distance from the switch support 19. The lower inclined portion is formed such that the portion closer to the lower end of the cam 20 has a larger distance from the switch support 19. The position of the cam 20 in the horizontal direction is set so that the inclined portion or the flat portion can contact the end point switch 8 when the car 5 moves.

  FIG. 3 is an enlarged view showing a state where the cam is not in contact with the end point switch. FIG. 4 is an enlarged view showing a state where the cam is in contact with the end point switch. 3 and 4 show the upper end switch 8a as an example.

  As shown in FIGS. 3 and 4, the upper end switch 8 a includes a switch body 21, a lever 22, a roller 23, a spring 24, a lever shaft 25, and a roller shaft 26. The lever 22 is provided so as to be rotatable with respect to the switch body 21 within a certain angle range around the lever shaft 25. The roller 23 is provided to be rotatable with respect to the lever 22 around a roller shaft 26. The lever shaft 25 and the roller shaft 26 are, for example, perpendicular to the moving direction of the car 5 and the longitudinal direction of the mounting arm 18. The spring 24 connects the switch body 21 and the lever 22 along a direction perpendicular to the lever shaft 25 and the roller shaft 26. The spring 24 is disposed on the side opposite to the roller 23 when viewed from the lever shaft 25.

  When the car 5 rises from the state shown in FIG. 3, the cam 20 comes into contact with the roller 23. When the flat portion of the cam 20 moves to the height of the roller 23, as shown in FIG. 4, the roller 23 is pushed into the switch support 19 side by the flat portion. When the car 5 is lowered from the state shown in FIG. 4, the cam 20 is separated from the roller 23. At this time, the lever 22 is rotated by the spring 24, so that the roller 23 returns to the position shown in FIG.

  FIG. 5 is an arrow view of the end point switch viewed from the X direction shown in FIG. Note that the terminals and contacts in FIG. 5 are schematically shown, and do not limit the internal structure of the actual end switch.

  As shown in FIG. 5, a terminal 28 a, a terminal 28 b, a fixed contact 29 and a movable contact 30 are provided inside the cover 27 of the switch body 21. The fixed contact 29 is connected to the terminal 28a. The movable contact 30 is connected to the terminal 28b. While the fixed contact 29 and the movable contact 30 are in contact, an electric signal is input from the upper end point switch 8 a to the control device 9. The movable contact 30 is opened and closed by the rotation of the lever shaft 25 accompanying the movement of the lever 22. The movable contact 30 is in contact with the fixed contact 29 when the upper end switch 8a is in the state shown in FIG. The movable contact 30 is not in contact with the fixed contact 29 when the upper end switch 8a is in the state shown in FIG. That is, when the roller 23 is pushed by the cam 20, the upper end switch 8a is changed from the closed state to the open state. The upper end switch 8 a returns from the open state to the closed state when the cam 20 is separated from the roller 23.

  FIG. 6 is a timing chart showing the relationship between the state of the cam and the state of the electrical signal with respect to the end point switch. FIG. 6 shows an electrical signal when the contact between the fixed contact 29 and the movable contact 30 is good and an electrical signal when the contact between the fixed contact 29 and the movable contact 30 is poor.

  As shown in FIG. 6, when the contact of the end point switch 8 is good, when the cam 20 is in contact with the end point switch 8, the electrical signal to the control device 9 is turned off with a delay of time t1. Further, when the contact of the end point switch 8 is good and the cam 20 is not in contact with the end point switch 8, the electrical signal to the control device 9 is turned on with a delay of time t1. The time t1 is a delay due to the mechanical operation of the end point switch 8, and is not due to an abnormality of the end point switch 8.

  On the other hand, as shown in FIG. 6, when the contact of the end point switch 8 is poor, if the cam 20 is not in contact with the end point switch 8, the control device is delayed by the time t1 plus the time t2. The electrical signal to 9 is turned on. In this case, the position of the car 5 when the electrical signal is turned on is farther from the end point switch 8 than when the contact of the contact point is good. Time t2 is a delay due to contact failure of the contact of the end point switch 8. The contact failure is caused by, for example, dust adhering to the contact and a good oxide film not being formed on the contact.

  The operation control unit 12 has a function of performing diagnostic operation when the operation mode of the elevator 1 is the maintenance mode. The diagnostic operation is, for example, an operation for operating and returning the end point switch 8 by moving the car 5 at a very low speed at the upper end or the lower end of the hoistway 2. The moving speed of the car 5 in the diagnostic operation is, for example, 4 meters per minute. The movement of the car 5 in the diagnostic operation may be automatically controlled, for example. The movement of the car 5 in the diagnostic operation may be controlled based on, for example, an operation performed by a maintenance worker on the in-car operation panel, the landing operation panel, the maintenance terminal, and the like.

  The position detection unit 13 detects the position of the car 5 when the contact of the end point switch 8 is changed from the closed state to the open state as the operating point of the end point switch 8 during the diagnostic operation. The detection of the operating point is performed based on, for example, that no electrical signal is input from the upper end switch 8a. The position detector 13 detects the position of the car 5 when the contact of the end point switch 8 is changed from the open state to the closed state as a return point of the end point switch 8 during the diagnostic operation. The detection of the return point is performed based on, for example, an input of an electric signal from the upper end switch 8a.

  The position information storage unit 14 stores the return point of the end point switch 8 detected by the position detection unit 13. The position information storage unit 14 stores the return point in association with at least the date when the return point is detected. That is, the position information storage unit 14 stores the history of the return point of the end point switch 8 for each end point switch 8. Note that the position information storage unit 14 may also store the operating point of the end point switch 8 detected by the position detection unit 13.

  The switch diagnosis unit 15 determines whether or not the difference between the value of the operating point and the value of the return point of the end point switch 8 detected by the position detection unit 13 is smaller than a preset specified value. That is, the switch diagnosis unit 15 determines whether or not the distance between the operating point of the end switch 8 and the return point in the hoistway 2 is smaller than a specified value.

  When the switch diagnosis unit 15 determines that the distance between the operating point of the end point switch 8 and the return point is equal to or greater than a specified value, the diagnosis result storage unit 16 displays “warning information” for the end point switch 8. Remember. “Warning information” is information indicating that a contact failure may occur in the end point switch 8.

  The switch diagnosis unit 15 returns the return point of the end point switch 8 stored in the position information storage unit 14 when the distance between the operating point of the end point switch 8 and the return point is smaller than a preset specified value. It is determined whether or not has changed continuously in the direction away from the installation position of the end switch 8 for a preset number of times. The preset number is, for example, 5 times. For example, when the end point switch 8 is the upper end point switch 8a, the switch diagnosis unit 15 determines whether or not the return point has been continuously lowered by a preset number of times. For example, when the end point switch 8 is the lower end point switch 8b, the switch diagnosis unit 15 determines whether or not the return point has continuously increased for a preset number of times.

  When the switch diagnosis unit 15 determines that the return point of the end point switch 8 has been continuously changed in a direction away from the installation position of the end point switch 8 by the switch diagnosis unit 15, The “predictive information” for the end switch 8 is stored. The “predictive information” is information indicating that a contact failure may occur in the end switch 8 in the future.

  FIG. 7 is a flowchart showing an operation example of the diagnostic system in the first embodiment. FIG. 7 shows a diagnostic operation of the upper end switch 8a as an example.

  When the car 5 rises in the diagnostic operation (step S101), the position detector 13 detects the operating point of the upper end point switch 8a (step S102). When the operating point is detected, the car 5 stops (step S103). Thereafter, the car 5 descends (step S104). As the car 5 descends, the position detector 13 detects the return point of the upper end switch 8a (step S105).

  The switch diagnosis unit 15 determines whether or not the difference between the value of the operating point and the value of the return point is smaller than a specified value (step S106). When it is determined in step S106 that the difference is smaller than the specified value, the switch diagnosis unit 15 determines whether the return point has been continuously lowered five times or more (step S107).

  If it is determined in step S107 that the return point has not been continuously lowered five times or more, the diagnostic system ends the diagnostic operation of the upper end switch 8a. In this case, the diagnosis result storage unit 16 may store information indicating that the upper end switch 8a is normal, for example.

  If it is determined in step S106 that the difference is greater than or equal to the specified value, the diagnosis result storage unit 16 stores “warning information” (step S108). When it is determined in step S107 that the return point has been continuously lowered five times or more, the diagnosis result storage unit 16 stores “predictive information”.

  The diagnostic operation of the lower end point switch 8b can be expressed as a partial replacement of the flowchart of FIG. In the diagnostic operation of the lower end switch 8b, for example, the content of step S101 is “cage down”, the content of step S104 is “cage up”, and the content of step S107 is “return point rises five times or more continuously?” Become.

  In the first embodiment, the position detection unit 13 has a switch contact disposed in the hoistway 2 so that the contact is changed from the closed state to the open state by contacting the cam 20 attached to the car 5 of the elevator 1. The position of the car 5 when it is changed from the open state to the closed state is detected as a return point of the switch. The switch diagnosis unit 15 determines whether or not the switch return point detected by the position detection unit 13 satisfies a preset condition. The diagnosis result storage unit 16 stores “warning information” indicating that a contact failure may occur in the switch when the switch diagnosis unit 15 determines that the return point of the switch does not satisfy the condition. To do. For this reason, according to Embodiment 1, the contact failure of the switch provided in the hoistway of the elevator can be diagnosed. As a result, by causing the “warning information” to be reflected in the next elevator maintenance work, it is possible to prevent the occurrence of problems.

  In the first embodiment, the position detection unit 13 detects the position of the car 5 when the contact of the switch arranged in the hoistway 2 changes from the closed state to the open state as the operating point of the switch. The switch diagnosis unit 15 performs the determination on the condition that the distance between the switch operating point and the return point detected by the position detection unit 13 is smaller than a preset specified value. That is, according to the first embodiment, the diagnosis is performed based on how far the return points are relatively apart from the operating point of the switch. For this reason, for example, even if the operating point changes due to expansion / contraction of the switch support 19 or wear of the roller 23, the diagnosis result is not affected. As a result, the contact failure of the switch can be diagnosed with high accuracy.

  In the first embodiment, the position information storage unit 14 stores the return point of the switch detected by the position detection unit 13 in association with at least the date when the return point is detected. When the switch return point detected by the position detection unit 13 satisfies the condition, the switch diagnosis unit 15 continues the switch return point stored in the position information storage unit 14 for a predetermined number of times or more. It is determined whether or not the switch is moving away from the installation position of the switch. The diagnosis result storage unit 16 contacts the switch when it is determined by the switch diagnosis unit 15 that the switch return point has continuously changed in a direction away from the installation position of the switch for a preset number of times. Stores “predictive information” indicating that a defect may occur in the future. Therefore, according to the first embodiment, even if no contact failure has occurred in the switch at the present time, a sign of contact failure can be detected based on a time-series change in the return point. As a result, the occurrence of trouble can be prevented in advance by reflecting the “predictive information” in the elevator maintenance plan.

  In the first embodiment, the diagnosis system may notify “warning information” and “predictive information” to an elevator maintenance worker or the like. The notification may be, for example, transmitting information to the information center 11 by the remote monitoring device 10. The notification may be performed using, for example, a display or a speaker provided in the hall or the car 5 or the like. The notification may be performed using a maintenance terminal, for example.

  In the first embodiment, at least one of the position information storage unit 14, the switch diagnosis unit 15, and the diagnosis result storage unit 16 may be included in the remote monitoring device 10 or the information center 11. That is, for example, not the control device 9 but the remote monitoring device 10 or the information center 11 may perform a contact failure diagnosis operation.

  The diagnosis system in the first embodiment may be applied to a switch other than the end point switch 8 provided in the hoistway 2. The diagnosis system can similarly perform an abnormality diagnosis on a contact type switch that operates in the same manner as the end point switch 8.

  FIG. 8 is a hardware configuration diagram of the control device.

  Each function of the operation control unit 12, the position detection unit 13, the position information storage unit 14, the switch diagnosis unit 15, and the diagnosis result storage unit 16 in the control device 9 is 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. 8 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, each function of the operation control unit 12, the position detection unit 13, the position information storage unit 14, the switch diagnosis unit 15, and the diagnosis result storage unit 16 is 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 control device 9 by hardware, software, firmware, or a combination thereof. Each function of the remote monitoring device 10 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 Encoder 8 End point switch 8a Upper end point switch 8b Lower end point switch 9 Control device 10 Remote monitoring device 11 Information center 12 Operation control unit 13 Position detection unit 14 Position Information storage unit 15 Switch diagnosis unit 16 Diagnosis result storage unit 17 Guide rail 18 Mounting arm 19 Switch support 20 Cam 21 Switch body 22 Lever 23 Roller 24 Spring 25 Lever shaft 26 Roller shaft 27 Cover 28a Terminal 28b Terminal 29 Fixed contact 30 Movable Contact 50 Dedicated hardware 51 Processor 52 Memory

Claims (4)

The position of the car when the contact of the switch arranged in the hoistway is changed from the open state to the closed state so that the contact is changed from the closed state to the open state by contacting with the cam attached to the elevator car. A position detector for detecting the return point of the switch;
A switch diagnosis unit that determines whether a return point of the switch detected by the position detection unit satisfies a preset condition;
A diagnostic result storage unit that stores information indicating that a contact failure may occur in the switch when the switch diagnosis unit determines that the return point of the switch does not satisfy the condition;
Elevator diagnostic system with The position detection unit detects the position of the car when the contact of the switch arranged in the hoistway changes from a closed state to an open state as an operating point of the switch,
2. The switch diagnosis unit according to claim 1, wherein the switch diagnosis unit performs determination based on a condition that a distance between an operation point of the switch detected by the position detection unit and a return point is smaller than a predetermined value set in advance. Elevator diagnostic system. A position information storage unit that stores a return point of the switch detected by the position detection unit in association with a date when the return point is detected;
When the switch return point detected by the position detection unit satisfies the condition, the switch diagnosis unit continues the switch return point stored in the position information storage unit for a predetermined number of times or more. To determine whether it is moving away from the installation position of the switch,
The diagnosis result storage unit touches the switch when the switch diagnosis unit determines that the return point of the switch continuously fluctuates in a direction away from the installation position of the switch for a predetermined number of times or more. The elevator diagnosis system according to claim 1, wherein information indicating that a defect may occur is stored.   The switch arranged in the hoistway is at least one of an upper end switch located at the upper end of the hoistway and a lower end switch located at the lower end of the hoistway. The elevator diagnostic system according to Item 1.

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