Diagnostic device, diagnostic system, remote monitoring system and maintenance system

Abstract

A diagnostic device, a diagnostic system, a remote monitoring system, and a maintenance system are specified that can detect an anomaly in a bearing with a simple configuration.The diagnostic device is a diagnostic device that diagnoses an anomaly of a bearing in an elevator system comprising a lifting machine, a first pulley, a motor that rotates the first pulley with a rotating shaft body, and the bearing that supports the rotating shaft body, a second pulley, a main rope wound around the first pulley and the second pulley, and a cabin suspended from the main rope, wherein the diagnostic device comprises: a rotation angle calculation unit that calculates the total value of a rotation angle with which the first pulley has been rotated; and a determination unit that determines an anomaly of the bearing based on the total value of a rotation angle calculated by the rotation angle calculation unit when the cabin has been moved in a specific section.

Claims

[1] A diagnostic device that diagnoses an abnormality of a bearing in an elevator system that includes a hoisting machine having a first sheave, a motor that rotates the first sheave with a rotating shaft body, and the bearing that supports the rotating shaft body, a second sheave, a main rope wound around the first sheave and the second sheave, and a car suspended from the main rope, wherein the diagnostic device comprises: a rotation angle calculation unit that calculates the total value of a rotation angle at which the first pulley has been rotated; and a determination unit that determines an abnormality of the bearing based on the total value of a rotation angle calculated by the rotation angle calculation unit when the car was moved in a specific section. [2] Diagnostic device according to claim 1, further comprising a calculation unit that calculates an axial displacement value, which is the change value of the position in the vertical direction of the rotary shaft body that has changed from a reference position, on the basis of the total value of the rotation angle calculated by the rotation angle calculation unit, wherein the determination unit determines an abnormality of the bearing based on the axial displacement value calculated by the calculation unit. [3] The diagnostic device according to claim 2, wherein the calculation unit calculates a winding angle of the main rope with respect to the first sheave based on the total value of the rotation angle calculated by the rotation angle calculation unit, and calculates the axial displacement value based on the calculated winding angle. [4] The diagnostic device according to claim 3, wherein the calculation unit calculates the axial displacement value h by applying to the following expression (1): a calculated winding angle θ, a distance x in the horizontal direction between the center of the first sheave and the center of the second sheave, a distance y0 in the vertical direction between the center of the first sheave and the center of the second sheave in a case where the first sheave is present at a reference position, and a constant i indicating the winding method for winding the main rope around the first sheave and the second sheave: [Mathematical Expression 1] h=x⋅tan(θ−(1+2i)π2)−y0 [5] A diagnostic device according to claim 3 or claim 4, wherein, when the car has performed an upward travel, the calculation unit calculates the winding angle θ by applying to the following expression (2): the total value Θ up a rotation angle at a time when the car has performed the upward travel in the specific section, a constant r indicating the rope guiding method of the elevator system, the distance X of the specific section, the effective radius Re, which is half the sum of the sheave diameter of the first sheave and the diameter of the main rope, and a coefficient C1, and when the car has made a downward travel, the calculation unit calculates the winding angle θ by applying to the following expression (3): the total value Θ dnof a rotation angle at a time when the car has performed the downward travel in the specific section, the constant r, the distance X, the effective radius Re, a coefficient C2 and a coefficient C3: [Mathematical Expression 2] θ=C1ΘuprX−ReΘup and [Mathematical Expression 3] θ=C2ΘdnrX−(1+C3)ReΘdn [6] The diagnostic device according to any one of claims 3 to 5, wherein the calculation unit calculates the winding angle based on a measured value of a loading weight of the cabin and the total value of the rotation angle. [7] The diagnostic device according to any one of claims 2 to 6, wherein the determination unit determines, based on the axial displacement value, that an abnormality in which the internal shape of the bearing changes is present as the abnormality of the bearing. [8] The diagnostic device according to any one of claims 2 to 7, wherein the determination unit calculates, based on the axial displacement value, the value of a loading weight that occurs in the bearing when at least one of the bearing and the rotary shaft body expands, and determines that an abnormality in which the value of the loading weight increases is present as the abnormality of the bearing. [9] The diagnostic device according to claim 8, wherein the determination unit determines the abnormality of the bearing based on a measured value of the temperature of the bearing and the axial displacement value. [10] The diagnostic device according to any one of claims 2 to 9, wherein the determining unit determines the type of abnormality of the bearing based on the difference between the axial displacement value calculated by the calculating unit and a reference value of the axial displacement value. [11] The diagnostic device according to any one of claims 1 to 10, wherein the determination unit determines the abnormality of the bearing based on the total value of a rotation angle calculated by the rotation angle calculation unit when the car has performed an ascending travel and a descending travel without stopping in a section between an upper floor and a lower floor, which is set in the car as the specific section. [12] Diagnostic device according to one of claims 1 to 10, which further comprises a diagnostic operation command unit which, when it is detected that an object is not present inside the car based on a measured value of a loading weight of the car, transmits a command to cause a control panel of the elevator system to perform a diagnostic operation in which the car performs an upward travel and a downward travel without stopping between an upper floor and a lower floor specified in the car, wherein the determination unit determines the abnormality of the bearing based on a total value of a rotation angle obtained by the rotation angle calculation unit when the diagnosis process was executed. [13] Diagnostic device according to one of claims 1 to 12, which also includes: a model storage unit that stores a learned model for inferring an axial displacement value, which is a change value of a position in the vertical direction of the rotary shaft body that has changed with respect to a reference position, from a total value of a rotation angle calculated by the rotation angle calculation unit when the car moved from a departure floor to an arrival floor, the departure floor, the arrival floor, and the loading weight of the car at the time the car moved; and a reasoning unit that, using the learned model stored in the model storage unit, infers the axial displacement value from the total value of the rotation angle calculated by the rotation angle calculation unit when the car moved from the departure floor to the arrival floor, the departure floor, the arrival floor, and the loading weight of the car at the time the car moved, wherein the determination unit determines the abnormality of the bearing based on the axial displacement value inferred by the conclusion unit. [14] A diagnostic device that diagnoses an abnormality of a bearing in an elevator system comprising a hoisting machine including a first sheave, a motor that rotates the first sheave with a rotating shaft body, and the bearing that supports the rotating shaft body, a second sheave, a main rope wound around the first sheave and the second sheave, and a car suspended from the main rope, wherein the diagnostic device comprises: a rotation angle calculation unit that calculates the total value of a rotation angle at which the first pulley has been rotated; a model storage unit that stores a learned model for inferring an axial displacement value, which is a change value of a position in the vertical direction of the rotary shaft body that has changed with respect to a reference position, from a total value of a rotation angle calculated by the rotation angle calculation unit when the car moved from a departure floor to an arrival floor, the departure floor, the arrival floor, and the loading weight of the car at the time the car moved; an inference unit that, using the learned model stored in the model storage unit, infers the axial displacement value from the total value of the rotation angle calculated by the rotation angle calculation unit when the car moved from the departure floor to the arrival floor, the departure floor, the arrival floor, and the loading weight of the car at the time the car moved; and a determination unit that determines an abnormality of the bearing based on the axial displacement value inferred by the inference unit. [15] A diagnostic system that diagnoses an abnormality of a bearing in an elevator system that includes a hoisting machine having a first sheave, a motor that rotates the first sheave with a rotating shaft body, and the bearing that supports the rotating shaft body, a second sheave, a main rope wound around the first sheave and the second sheave, and a car suspended from the main rope, the diagnostic system comprising: a rotation angle detection device arranged in the hoisting machine and transmitting an angle signal corresponding to the angle at which the first sheave has been rotated; and the diagnostic device according to any one of claims 1 to 14, which calculates, based on the angle signal transmitted from the rotation angle detection device, the total value of a rotation angle at which the first pulley has been rotated, and determines an abnormality of the bearing based on the total value of a rotation angle calculated when the car has moved in a specific section. [16] Remote monitoring system comprising: the diagnostic system according to claim 15; and a monitoring device that receives information concerning a diagnosis result of the diagnosis device of the diagnosis system that has determined an abnormality of the bearing and transmits the information concerning the diagnosis result to the outside. [17] Maintenance system comprising: the diagnostic system according to claim 15; a monitoring device that receives information concerning a diagnosis result of the diagnostic device of the diagnostic system that has determined an abnormality of the bearing and transmits the information concerning the diagnosis result to the outside; and an information center device that receives the information concerning the diagnostic result from the monitoring device and generates a maintenance plan for the elevator system based on the information concerning the diagnostic result. [18] Maintenance system that performs maintenance of an elevator system that includes a hoisting machine having a first sheave, a motor that rotates the first sheave with a rotating shaft body, and the bearing that supports the rotating shaft body, a second sheave, a main rope wound around the first sheave and the second sheave, and a car suspended from the main rope, the maintenance system comprising: a rotation angle calculation unit that calculates the total value of a rotation angle at which the first pulley has been rotated when the car has moved from a departure floor to an arrival floor; and a calculation unit that calculates an axial displacement value, which is the change value of the position in the vertical direction of the rotary shaft body that has changed from a reference position, based on the total value of the rotation angle calculated by the rotation angle calculation unit; a learning information acquisition unit that acquires learning information including information linking the total value of the rotation angle calculated by the rotation angle calculation unit, the axial displacement value calculated by the calculation unit, the departure floor, the arrival floor, and the loading weight at the time the car was moving; and a model generation unit that generates a learned model using the learning information acquired by the learning information acquisition unit, for inferring the axial displacement value from the total value of the rotation angle calculated by the rotation angle calculation unit, the departure floor, the arrival floor, and the loading weight of the car at the time the car was moving.

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