Elevator rope diagnostic device and elevator rope diagnostic method

Abstract

Provided is an elevator rope diagnostic device and an elevator rope diagnostic method capable of accurately diagnosing deterioration of an elevator rope. [Solution] According to an embodiment, an elevator rope diagnostic device includes a deterioration calculation unit that calculates the degree of deterioration for each position in the elevator rope based on the number of bends caused by the rope passing through a sheave over which it is hung, and the number of slippages that occurred between the rope and the sheave, counted for each position in the rope.

Description

[Technical field]

[0001] An embodiment of the present invention relates to an elevator rope diagnostic device and an elevator rope diagnostic method. [Background technology]

[0002] When elevator ropes deteriorate, they can stretch or slip between the sheaves over which they are stretched, which can prevent the elevator control panel from accurately recognizing the car's position.

[0003] To deal with this, there is a technique that measures the number of times the rope passes through the sheave at each position and estimates the degree of rope deterioration based on this measurement (for example, Patent Document 1). There is also a technique that counts pulses proportional to the amount of rotation of the winch that winds up the rope, measures the amount of slippage between the rope and the sheave at each count interval, and estimates the degree of rope deterioration based on this measurement (for example, Patent Document 2). By using these techniques, it is possible to detect when the rope has deteriorated and take appropriate measures, such as replacing the rope. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-27888 A [Patent Document 2] JP 2013-241247 A Summary of the Invention [Problem to be solved by the invention]

[0005] The progression of rope deterioration depends on various factors, such as elevator operation conditions and rope material. For example, even if the number of times the rope passes through the sheaves at each position does not reach a predetermined value, slippage may occur depending on the rope material. Also, even if there is no slippage between the rope and the sheaves, deterioration may progress in places where the sheaves pass frequently in the rope due to elevator operation conditions.

[0006] However, the above-mentioned technology had a problem in that it was not possible to diagnose rope deterioration by taking into account both the number of times the rope passes through the sheaves at each position and the occurrence of slippage between the rope and the sheaves.

[0007] The present invention has been made in consideration of the above circumstances, and has an object to provide an elevator rope diagnostic device and an elevator rope diagnostic method that are capable of accurately diagnosing deterioration of an elevator rope. [Means for solving the problem]

[0008] According to an embodiment for achieving the above object, an elevator rope diagnostic device includes a deterioration calculation unit that calculates the degree of deterioration for each position in the elevator rope based on the number of bends caused by the rope passing through a sheave over which the rope is suspended, and the number of slippages that occurred between the rope and the sheave, counted for each position in the rope. [Brief description of the drawings]

[0009] [Figure 1] 1 is an overall view showing the configuration of an elevator using an elevator control device equipped with the function of a rope diagnosis device according to a first and second embodiments. FIG. [Diagram 2] 1 is a block diagram showing a configuration of an elevator control device equipped with the function of a rope diagnosis device according to a first embodiment. [Diagram 3] 4 is a flowchart showing the operation of the rope diagnosis device according to the first embodiment. [Figure 4]FIG. 11 is a block diagram showing a configuration of an elevator control device equipped with the function of a rope diagnosis device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an elevator equipped with the function of the elevator rope diagnostic device according to the first and second embodiments of the present invention will be described.

[0011] First Embodiment Configuration of the elevator according to the first embodiment FIG. 1 is an overall view showing the configuration of an elevator 1A according to a first embodiment. The elevator 1A includes a hoist 31, a first sheave 311, and a second sheave 32 installed in a machine room 3 above a hoistway 2 of a building, a main rope 41 hung between the first sheave 311 and the second sheave 32, a car 42 suspended from one end of the main rope 41, a counterweight 43 suspended from the other end of the main rope 41, an elevator control device 100A installed in the machine room 3, and an administrator terminal 200 capable of communicating with the elevator control device 100A. The car 42 and the elevator control device 100A are connected by a tail cord 44. In the elevator 1A, the main rope 41 is hung between the first sheave 311 and the second sheave 32 in a 1:1 roping manner.

[0012] The first sheave 311 is installed in the hoist 31. The first sheave 311 is installed with a rotation amount measuring device 312 that measures the amount of rotation of the first sheave 311. The rotation amount measuring device 312 has a pulse generator (not shown) that generates pulses according to the amount of rotation of the first sheave 311, and a pulse counter (not shown) that counts the generated pulses, and measures the amount of rotation of the first sheave 311 based on the number of pulses counted by the pulse counter.

[0013] A code tape 45 is installed in the elevator 2 in the range in the height direction in which the car 42 ascends and descends. Identification information, for example, a scale, that identifies the height at each height position is added to the code tape 45. A measuring device 421 is installed on the upper part of the car 42. The measuring device 421 measures the current absolute position of the car 42 by reading the identification information in the code tape 45 from a predetermined direction.

[0014] 2 is a block diagram showing the configuration of the elevator control device 100A. The elevator control device 100A includes a storage unit 11, a wireless communication unit 12, and a CPU 13A.

[0015] The storage unit 11 has a sheave information storage unit 111 and a rope information storage unit 112. The sheave information storage unit 111 stores information on the first sheave 311 and the second sheave 32, such as the installation positions, diameters, and bending number correction values ​​preset for each groove shape provided on the outer periphery of each sheave. The bending number correction value will be described later.

[0016] The rope information storage unit 112 stores the integrated value of the number of times each sheave has passed for each position in the main rope 41 during the period from the start of use of the main rope 41 to the present, the number of times bending, and the number of times slippage has occurred. The wireless communication unit 12 performs wireless communication with the manager terminal 200. The number of times bending and the number of times slippage has occurred will be described later.

[0017] The CPU 13A is, for example, a CPU (Central Processing Unit) provided in a general-purpose microcomputer, and configures one or more information processing units described below by installing and executing a predetermined elevator control program.

[0018] The CPU 13A has a function as a rope diagnostic device, and includes a rotation amount acquisition unit 131, a cage information acquisition unit 132, an operation control unit 133, a bend count update unit 134, a slippage occurrence count update unit 135, a deterioration calculation unit 136, and an output control unit 137.

[0019] The rotation amount acquisition unit 131 acquires information on the amount of rotation of the first sheave 311 measured by the rotation amount measurement device 312. The car information acquisition unit 132 acquires information output from devices in the car 42, such as information on the absolute position of the car 42 measured by the measurement device 421, information on the operation content performed by the user on an in-car operation panel (not shown), and the like.

[0020] The operation control unit 133 controls devices such as the winch 31 based on the amount of rotation of the first sheave 311 acquired by the rotation amount acquisition unit 131 and the information acquired by the car information acquisition unit 132 .

[0021] During the raising and lowering operation of the car 42, the bend count update unit 134 updates the accumulated number of passes through each sheave in the rope information memory unit 112 for each position within the main rope 41, each time it passes through the first sheave 311 and each time it passes through the second sheave 32, based on the absolute position information of the car 42 measured by the measuring device 421 and the sheave information stored in the sheave information memory unit 111.

[0022] The slippage occurrence count update unit 135 updates the accumulated value of the slippage occurrence count in the rope information memory unit 112 with respect to the position in the main rope 41 where slippage occurred between the first sheave 311 during the raising and lowering operation of the car 42.

[0023] The deterioration calculation unit 136 calculates the degree of deterioration for each position in the main rope 41 based on the information stored in the rope information storage unit 112.

[0024] The output control unit 137 transmits the information on the degree of deterioration calculated by the deterioration calculation unit 136 to the manager terminal 200 via the wireless communication unit 12, and causes it to be output.

[0025] Operation of the elevator according to the first embodiment While the elevator 1A is operating, the car information acquisition unit 132 in the elevator control device 100A acquires information output from equipment in the car 42, such as information on the absolute position of the car 42 measured by the measuring device 421, and information on the operations performed by the user on the in-car operation panel (not shown).

[0026] In addition, the operation control unit 133 controls devices such as the winch 31 based on the amount of rotation of the first sheave 311 measured by the rotation amount acquisition unit 131 and the information acquired by the car information acquisition unit 132.

[0027] During operation of the elevator 1A, the elevator control device 100A executes a rope diagnosis process for diagnosing the degree of deterioration of the main rope 41. Fig. 2 is a flowchart showing the operation of the rope diagnosis process executed by the elevator control device 100A during operation of the elevator 1A.

[0028] When the elevator 1A starts to ascend or descend the car 42 while it is operating ("YES" in S1), the number of bends update unit 134 recognizes the position within the main rope 41 that passed through the first sheave 311 and the position within the main rope 41 that passed through the second sheave 32 during the ascending or descending operation based on the absolute position information of the car 42 measured by the measuring device 421 (S2).

[0029] The bend number updating unit 134 determines that the position x has passed the first sheave 311, for example, when the predetermined position x in the main rope 41 passes any position on the outer periphery of the first sheave 311, such as the midpoint or end point of the portion of the outer periphery of the first sheave 311 that contacts the main rope 41. The bend number updating unit 134 also determines that the position x has passed the second sheave 32, when the position x has passed any position on the outer periphery of the second sheave 32.

[0030] The bend count update unit 134 updates the accumulated value of the number of times the first sheave 311 has been passed, stored in the rope information memory unit 112, by incrementing it by 1 for a predetermined position within the main rope 41 that is in contact with the first sheave 311 when it is recognized in step S2 that the first sheave 311 has been passed, for example, the midpoint of the part of the main rope 41 that is in contact with the first sheave 311.

[0031] Furthermore, the bend count updating unit 134 updates the integrated value of the number of times the second sheave 32 has been passed, stored in the rope information storage unit 112, by incrementing it by 1 for a predetermined position in the main rope 41 that is in contact with the second sheave 32 when it is recognized in step S2 that the second sheave 32 has been passed (S3). The bend count updating unit 134 determines whether the first sheave 311 or the second sheave 32 has passed for each position at intervals of several mm in the main rope 41, for example, and updates the number of bends for the position recognized as having been passed.

[0032] In addition, after the elevator car 42 starts to move up and down, each time a pulse is generated from the pulse generator in the rotation amount measuring device 312, the slippage occurrence count update unit 135 determines whether or not slippage has occurred between a predetermined position in the main rope 41 that is in contact with the first sheave 311, for example, the midpoint of the part of the main rope 41 that is in contact with the first sheave 311.

[0033] A description will be given of the process of determining whether or not a slippage has occurred, which is executed by the slippage occurrence count update unit 135. The slippage occurrence count update unit 135 calculates the amount of slippage at a position in the main rope 41 that is in contact with the first sheave 311, based on the appropriate feed amount of the main rope 41 calculated from the shape of the first sheave 311 and the displacement of the actual measurement value of the absolute position of the car 42, during one pulse count interval.

[0034] The appropriate feed amount of main rope 41 in one pulse count interval is calculated based on the preset pulse generation interval of a pulse generator in rotation amount measuring device 312 and the diameter of first sheave 311 stored in sheave information storage unit 111. This "appropriate feed amount of the main rope" is the length of main rope 41 that is fed out by the rotation of first sheave 311 in a state where an appropriate frictional force is applied between main rope 41 and first sheave 311 and no slippage occurs.

[0035] When the pulse generator in the rotation amount measuring device 312 is set to generate N pulses for each rotation of the first sheave 311, the first sheave 311 rotates 1 / N times during one pulse count interval by the pulse counter. The appropriate feed amount of the main rope 41 during one pulse count interval at this time is calculated by the following formula (1).

[0036] f = π × d a / N (1) In the above formula (1), f is the appropriate feed amount of the main rope 41 in one pulse count interval, π is the circular constant, and d a is the central diameter of the arc described by the main rope 41 hung on the first sheave 311.

[0037] The slip occurrence count update unit 135 calculates the amount of slippage between the first sheave 311 for each position of the main rope 41 using the feed amount f calculated by the above formula (1) and the displacement of the absolute position of the car 42 measured by the measuring device 421 during one pulse count interval, using the following formula (2).

[0038] L = |δ-f| (2) In the above equation (2), L is the amount of slippage of the main rope 41, δ is the displacement of the absolute position of the car 42, and the right-hand side indicates the absolute value of the difference between the displacement of the absolute position of the car 42 and the appropriate feed amount of the main rope 41.

[0039] The slippage occurrence count update unit 135 calculates the amount of slippage at a predetermined position in the main rope 41 that is in contact with the first sheave 311 for each pulse count interval using the above formula (2). When the slippage occurrence count update unit 135 recognizes the calculated amount of slippage as a valid value for the amount of slippage and not as an error, it determines that slippage has occurred at the position in the main rope 41 that is in contact with the first sheave 311.

[0040] Each time a pulse is generated from the pulse generator in the rotation amount measuring device 312 during an ascending or descending operation, the slippage occurrence count updating unit 135 uses the above formula (2) to determine whether or not slippage has occurred between the first sheave 311 and a predetermined position in the main rope 41 that is in contact with the first sheave 311. When the slippage occurrence count updating unit 135 detects that slippage has occurred between the first sheave 311 ("YES" in S4), it recognizes the position in the main rope 41 at the time of this detection as the position where slippage has occurred.

[0041] The slippage occurrence count update unit 135 updates the integrated value of the slippage occurrence count stored in the rope information storage unit 112 by incrementing it by 1 for the predetermined position in the main rope 41 where the slippage occurred (S5).

[0042] When the slippage occurrence count update unit 135 updates the integrated value of the slippage occurrence count in step S5, or when it determines in step S4 that no slippage has occurred between the main rope 41 and the first sheave 311 ("NO" in S4), if the lifting and lowering operation of the car 42 has not ended ("NO" in S6), it returns to step S2. The processing of steps S2 to S6 is repeated until the lifting and lowering operation of the car 42 ends.

[0043] When the raising and lowering operation of the car 42 is completed ("YES" in S6), the bend count update unit 134 calculates the number of bends for each position in the main rope 41 from the integrated value of the number of passes through the first sheave 311 for each position in the main rope 41 stored in the rope information storage unit 112, the integrated value of the number of passes through the second sheave 32, and the bend number correction value for each sheave in the sheave information stored in the sheave information storage unit 111.

[0044] This number correction value for each sheave is preset based on the groove shape of each sheave, and for groove shapes that impose a high load on the main rope 41 passing through, such as a V-shape that creates a gap between the main rope 41 and the groove shape that has a small contact area with the main rope 41, the number of passes is set to be higher by a predetermined percentage in order to hasten the deterioration of the main rope 41. In this case, a coefficient of 1 or more is set as the bending number correction value, for example.

[0045] Furthermore, for a groove shape that places a low load on the main rope 41 passing through, such as a U-shape that creates no gap between the main rope 41 and the groove shape and has a large contact area with the main rope 41, the bend number correction value is set to reduce the number of passes by a predetermined percentage, since the groove shape is unlikely to affect the progression of deterioration of the main rope 41. In this case, a coefficient of 1 or less than 1 is set as the bend number correction value, for example.

[0046] The bend count update unit 134 calculates the number of bends by adding up the corrected number of passes through the first sheave 311 and the corrected number of passes through the second sheave 32 for each position of the main rope 41, as shown in the following equation (3).

[0047] m = n a × k a + n b × kb (3) In the above formula (3), m is the number of bending times, and n a is the number of passes through the first sheave 311, and k a is the bending number correction value for the groove shape of the first sheave 311, and n b is the number of passes through the second sheave 32, and k b is a bend number correction value related to the groove shape of the second sheave 32. The bend number update unit 134 updates the number of bends for each position of the main rope 41 stored in the rope information storage unit 112 with the value calculated by the above formula (3) (S7).

[0048] The deterioration calculation unit 136 calculates the degree of deterioration for each position in the main rope 41, for example, for each meter, based on the number of bends and the number of slippages that occurred for each position of the main rope 41 stored in the rope information storage unit 112, using the following formula (4) (S8).

[0049] X(x) = m(x) / M + s(x) / S (4) In the above formula (4), X(x) is the degree of deterioration at any position x of the main rope 41, m(x) is the number of bends of the main rope 41 at the position x, M is the allowable number of bends, s(x) is the number of slippages that have occurred at the position x of the main rope 41, and S is the allowable number of slippages.

[0050] The "allowable number of bends" is a preset upper limit of the number of bends that maintains a state in which the main rope 41 can be normally used. The "allowable number of slippages" is a preset upper limit of the number of slippages that can determine that the main rope 41 can be normally used.

[0051] The output control unit 137 generates output information based on the degree of deterioration for each position of the main rope 41 calculated by the deterioration calculation unit 136, and transmits the output information to the manager terminal 200 via the wireless communication unit 12 (S9). The output control unit 137 may display the degree of deterioration for each position over the entire length of the main rope 41 in three stages, specifically, the first stage being a state in which "no deterioration has occurred," the second stage being a state in which "checking is required," and the third stage being a state in which "rope replacement is required." Alternatively, the output control unit 137 may display a detailed degree of deterioration, such as the calculation result of the above-mentioned formula (3), for any range of the main rope 41. Alternatively, the output control unit 137 may generate output information by switching between these three-stage display and a detailed display based on the operation of the manager.

[0052] The manager terminal 200 outputs the information on the deterioration degree for each position of the main rope 41 transmitted from the elevator control device 100A. The manager can check the deterioration degree of the main rope 41 by recognizing the information output from the manager terminal 200.

[0053] According to the above first embodiment, the deterioration calculation unit 136 calculates the degree of deterioration for each position in the main rope 41 of the elevator 1A based on the number of bends caused by the main rope 41 passing through the first sheave 311 and the second sheave 32 through which the main rope 41 is stretched, and the number of slippages that occurred between the main rope 41 and the first sheave 311, counted for each position in the main rope 41.

[0054] This allows the deterioration degree of the main rope 41 of the elevator 1A to be diagnosed for each position with high accuracy. In addition, by transmitting the diagnosis result to the manager's terminal, the time required for maintenance work by the manager can be reduced.

[0055] Furthermore, the deterioration calculation unit 136 calculates the deterioration degree of the main rope 41 by using the number of bending times corrected based on at least one of the shapes of the grooves for installing the main rope 41 formed in the first sheave 311 and the second sheave 32, and the positions of the first sheave 311 and the second sheave 32. This makes it possible to diagnose the deterioration degree of the main rope 41 with even greater accuracy.

[0056] Furthermore, the main rope 41 is hung over the first sheave 311 and the second sheave 32, and the deterioration calculation unit 136 calculates the degree of deterioration for each position in the main rope 41 using the number of bends calculated by adding up the number of passes counted for each of the multiple sheaves 311, 32. This makes it possible to accurately diagnose the degree of deterioration of the main rope 41 even when multiple sheaves are used.

[0057] The elevator control device 100A also includes a rope information storage unit 112 that stores the number of bends and the number of slippages, a bend number update unit 134 that increases and updates the number of bends in the rope information storage unit 112 for a position in the main rope 41 that has passed through the first sheave 311 and the second sheave 32 as the car 42 ascends and descends, and a slippage occurrence number update unit 135 that, when it is determined that slippage has occurred between a predetermined position of the main rope 41 and the first sheave 311 as the car 42 ascends and descends, increases and updates the number of slippage occurrences in the rope information storage unit 112 for this predetermined position. A deterioration calculation unit 136 calculates the deterioration degree of the main rope 41 using the number of bends and the number of slippage occurrences stored in the rope information storage unit 112.

[0058] This allows the number of bends and slippages counted when the car 42 ascends or descends and the main rope 41 moves to be appropriately increased. In this case, even if the car is operated differently from normal operation, for example, when the car stops between floors during inspection work and changes the running direction, the number of bends and slippages of the main rope 41 caused by this operation can be appropriately counted and updated.

[0059] The deterioration calculation unit 136 also calculates the degree of deterioration for each position in the main rope 41 based on the ratio of the counted number of bends to a preset allowable number of bends, which is the upper limit of the number of bends at which the main rope 41 can be kept in a normally usable state, and the ratio of the counted number of slippage occurrences to a preset allowable number of slippage occurrences, which is the upper limit of the number of slippage occurrences at which the main rope 41 can be determined to be normally usable. This makes it possible to accurately detect deterioration according to the characteristics of the main rope 41.

[0060] Second Embodiment Configuration of elevator according to second embodiment The overall configuration of the elevator 1B according to the second embodiment is similar to that of the elevator 1A in FIG. 1 described in the first embodiment, except that the elevator 1B has an elevator control device 100B instead of the elevator control device 100A.

[0061] 4 is a block diagram showing the configuration of an elevator control device 100B according to this embodiment. The elevator control device 100B has the same configuration as the elevator control device 100A described in the first embodiment, except that the CPU 13B has a traction shortage determination unit 138, so detailed descriptions of parts having the same functions will be omitted.

[0062] In this embodiment, the slippage occurrence count update unit 135 functions as a slippage amount calculation unit, and stores the amount of slippage between the first sheave 311 for each position of the main rope 41 calculated by the above-mentioned formula (2) in the rope information storage unit 112. The traction shortage determination unit 138 determines that a traction shortage has occurred when the amount of slippage between the first sheave 311 for each position of the main rope 41 stored in the rope information storage unit 112 exceeds a preset threshold value.

[0063] Operation of the elevator according to the second embodiment In the second embodiment, while performing processing similar to that of the first embodiment, the traction insufficiency determination unit 138 monitors the amount of slippage between the first sheave 311 for each position of the main rope 41 stored in the rope information storage unit 112, and determines that a traction insufficiency has occurred when the amount of slippage exceeds a preset threshold value.

[0064] The threshold value for detecting the occurrence of insufficient traction is desirably set based on the design value of the amount of rope slippage when the car 42 moves from the top floor to the bottom floor, or based on the measured value of the amount of rope slippage in a normal state, for example, when the car 42 is normally operated from the top floor to the bottom floor after the elevator is installed. Furthermore, the occurrence of insufficient traction can be detected with even greater accuracy by correcting the threshold value based on the ratio of the moving distance of the car to the distance from the top floor to the bottom floor.

[0065] For example, the traction shortage determination unit 138 may set a threshold value of the amount of rope slippage when the car 42 is normally operated from the top floor to the bottom floor as Y, and set the total amount of rope slippage that occurs when the car 42 moves a distance h as l h Then, when the following formula (5) is satisfied, the occurrence of insufficient traction is detected.

[0066] Y × h / H < l h (5) In the above formula (5), H represents the distance from the top floor to the bottom floor.

[0067] When the traction shortage determination unit 138 detects the occurrence of a traction shortage, it obtains information on the absolute position of the elevator 42 at the time of detection and transmits it to the administrator terminal 200 via the output control unit 137 and the wireless communication unit 12.

[0068] The manager terminal 200 issues a report by outputting information on the absolute position of the car 42 when the lack of traction was detected, the information being transmitted from the elevator control device 100B. By recognizing the information issued from the manager terminal 200, the manager can confirm the position of the car 42 when the lack of traction occurred.

[0069] In the above-mentioned first and second embodiments, a case has been described in which the measuring device 421 installed in the car 42 measures the absolute position of the car 42 by reading the identification information in the code tape 45 installed in the elevator shaft 2 from a specified direction, but the method of measuring the absolute position of the car is not limited to this.

[0070] For example, the absolute position of the car 42 may be measured by a laser displacement meter installed in the elevator 2 or the machine room 3. Alternatively, a sensor mounted on the speed governor may measure the absolute position of the car 42. This allows the number of devices installed in the car 42 to be reduced.

[0071] In the above-mentioned first and second embodiments, the elevators 1A and 1B are described as elevators in which the hoist 31, the first sheave 311, and the second sheave 32 are installed in the machine room 3, and the main rope 41 is hung on these sheaves in a 1:1 roping method, but the present invention is not limited to this. For example, the present invention can be similarly applied to an elevator in which a machine room is not provided and the hoist 31, the first sheave 311, and the second sheave 32 are arranged in a hoistway, or an elevator in which the main rope 41 is hung on the sheaves in a 2:1 roping method, and deterioration of the main rope 41 can be diagnosed.

[0072] Furthermore, in the first and second embodiments described above, the sheave information storage unit 111 of the elevator control device 100A, 100B may further store information on the presence or absence of S-bend in the main rope 41 depending on the position of the sheave, and the bend count update unit 134 may use this information on the presence or absence of S-bend to correct the number of passes of the sheave to calculate the number of bends. Specifically, if the main rope 41 is installed so as to have an S-bend state, the load on the main rope 41 increases, so the number of passes is corrected to be higher by a predetermined percentage. This allows the bend count update unit 134 to calculate the number of bends with even higher accuracy.

[0073] In addition, in the above-mentioned first embodiment, the bend count update unit 134, the slip occurrence count update unit 135, and the deterioration calculation unit 136 are each provided as separate information processing units within the CPU 13A of the elevator control device 100A, but these multiple processes may also be configured to be executed by a single information processing unit.

[0074] Similarly, in the above-mentioned second embodiment, the bend count update unit 134, the slip occurrence count update unit 135, the deterioration calculation unit 136, and the traction deficiency determination unit 138 are each provided as separate information processing units within the CPU 13B of the elevator control device 100B, but these multiple processes may also be configured to be executed by a single information processing unit.

[0075] Furthermore, in the first and second embodiments described above, information on the deterioration degree of the main rope 41 calculated by the deterioration calculation unit 136 may be transmitted to and stored in a remote management device or a cloud serving as a management device. This allows the manager to access the remote management device or cloud from the manager terminal 200 at any time and check the information on the deterioration degree of the main rope 41.

[0076] In the first and second embodiments described above, the memory unit 11, the bend count update unit 134, the slip occurrence count update unit 135, the deterioration calculation unit 136, and the output control unit 137 provided in the elevator control device 100A, 100B may be provided outside the elevator control device 100A. By configuring in this way, a main rope diagnosis function can be easily added to an existing elevator system.

[0077] Furthermore, the memory unit 11, the bend count update unit 134, the slip occurrence count update unit 135, the deterioration calculation unit 136, and the output control unit 137 may be provided in a management device remote from the elevators 1A and 1B or in a cloud serving as a management device. By configuring in this manner, deterioration diagnosis of the main ropes of multiple elevators can be performed by these functional units provided in the remote management device or the cloud.

[0078] Also, only some of these functional units, for example only the memory unit 11, may be provided in a management device remote from the elevators 1A, 1B or in a cloud serving as a management device. By configuring in this manner, a plurality of rope diagnosis devices can perform deterioration diagnosis of the main rope 41 using information stored in the management device or the cloud.

[0079] Furthermore, the elevator control devices 100A and 100B may store rope information by adding information on the number of passengers in the car immediately before the update and the time as update history information on the number of bends and the number of slips. This allows the deterioration calculation unit 136 to calculate the deterioration degree of the main rope 41 by taking these pieces of information into consideration, and allows the manager to verify the progress of deterioration of the main rope by referring to these pieces of information.

[0080] In the above-described first and second embodiments, the rope diagnosis device calculates the degree of deterioration of the main rope 41. However, this is not limited to this, and the rope diagnosis device may calculate the degree of deterioration of other ropes hung across sheaves in the elevator, such as governor ropes or compensating ropes.

[0081] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0082] 1A, 1B... elevator, 2... elevator shaft, 3... machine room, 11... memory unit, 12... wireless communication unit, 13A, 13B... CPU, 31... hoist, 32... second sheave, 41... main rope, 42... car, 43... counterweight, 44... tail cord, 45... cord tape, 100A, 100B... elevator control device, 111... sheave information memory unit, 112... rope information memory unit, 131... rotation amount acquisition unit, 132... car information acquisition unit, 133... operation control unit, 134... bending number update unit, 135... slip occurrence number update unit, 136... deterioration calculation unit, 137... output control unit, 138... traction shortage determination unit, 200... administrator terminal, 311... first sheave, 312... rotation amount measurement device, 421... measurement device

Claims

1. An elevator rope diagnosis device comprising a deterioration calculation unit that calculates the degree of deterioration for each position in the elevator rope based on the number of bends caused by the rope passing through a sheave over which the rope is hung, and the number of slippages that occur between the rope and the sheave, counted for each position in the rope.

2. 2. The elevator rope diagnosis device according to claim 1, wherein the deterioration calculation unit calculates the degree of deterioration using a number of bending times corrected based on at least one of a shape of a groove formed in the sheave for installing the rope and a position of the sheave.

3. The rope is hung over a plurality of sheaves, 2. The elevator rope diagnosis device according to claim 1, wherein the deterioration calculation unit calculates the degree of deterioration using a number of bends calculated by adding up the number of passes counted for each of the plurality of sheaves for each position in the rope.

4. A rope information storage unit that stores the number of bending times and the number of slippage occurrence times; a bend number update unit that increases and updates the number of bends stored in the rope information storage unit for a position in the rope that has passed through the sheave as the elevator car rises or falls; a slip occurrence count update unit that, when it is determined that a slip has occurred between a predetermined position of the rope and the sheave due to the elevator car ascending or descending, increases and updates the slip occurrence count stored in the rope information storage unit with respect to the predetermined position, 2. The elevator rope diagnosis device according to claim 1, wherein the deterioration calculation unit calculates the degree of deterioration using the number of bending times and the number of slippage occurrence times stored in the rope information storage unit.

5. 2. The elevator rope diagnosis device according to claim 1, wherein the deterioration calculation unit calculates a degree of deterioration for each position in the rope based on a ratio of the counted number of bends to a preset allowable number of bends, which is an upper limit of the number of bends at which the rope can be maintained in a normally usable state, and a ratio of the counted number of slippage occurrences to a preset allowable number of slippage occurrences, which is an upper limit of the number of slippage occurrences at which the rope can be determined to be normally usable.

6. A management device that stores the number of bending times and the number of slippage times is communicatively connected to the management device, 2. The elevator rope diagnosis device according to claim 1, wherein the deterioration calculation unit calculates the degree of deterioration using the number of bending times and the number of slippage occurrences stored in the management device.

7. A slippage amount calculation unit is further provided for calculating an amount of slippage that has occurred when it is determined that slippage has occurred between the predetermined position of the rope and the sheave, The elevator rope diagnosis device according to any one of claims 1 to 6, further comprising a traction deficiency determination unit that determines that a traction deficiency has occurred when the slippage amount calculated by the slippage amount calculation unit exceeds a preset threshold value.

8. Rope diagnostic device, An elevator rope diagnosis method for calculating a degree of deterioration at each position in an elevator rope based on the number of bends caused by the rope passing through a sheave over which the rope is hung, and the number of slippages that occur between the rope and the sheave, counted for each position in the rope.

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