Elevator state monitoring method, state monitoring program, recording medium, and state monitoring device

Abstract

The elevator state monitoring method includes a tension calculation step of calculating the tension of each of a plurality of ropes using a tension model composed of a plurality of motion equations. The tension model takes discrete tension data including measured values of tension of each rope and a plurality of parameters as input data, and takes continuous tension data as output data. In the tension model, the amount of displacement imparted to the pulley-side end of each winding-side portion and each delivery-side portion is set to a free length of the rope, which is a value obtained by subtracting the amount of elongation of the rope from the amount of winding based on the amount of winding of the pulley.

Description

Technical Field

[0001] The present disclosure relates to an elevator status monitoring method, a status monitoring program, a recording medium, and a status monitoring device. Background Art

[0002] In existing elevator rope elongation detection devices, for each of a plurality of elevator ropes, the current tension measured by a rope tension measuring device is compared with the normal tension stored in a storage unit. Then, when the difference between the current tension and the normal tension is equal to or greater than a specified value, a rope slip determination unit determines that the elevator rope has slipped (for example, refer to Patent Document 1).

[0003] In Patent Document 1, formulas related to the tension of a main rope modeled using one spring are disclosed in the same way as in Non-Patent Documents 1 and 2. The rope modeling technology disclosed in these documents has advantages such as reduced computational load and high efficiency in simulation calculations compared to the modeling technology that divides a rope into multiple elements.

[0004] However, on the other hand, the rope modeling technology based on one spring has a disadvantage that the simulation accuracy of the rope tension is insufficient, for example, as in Non-Patent Document 2. That is, the difference between the measured value related to the rope tension and the simulation result remains as a problem.

[0005] In addition, "modeling" here, for example, means deriving a model represented by a mathematical formula, a program, etc. from the equations of motion used to simulate and analyze physical behavior, and is also called "modeling". As a method for analyzing behavior, simulation analysis using a computer is currently widespread and common, but in addition, it includes mathematical analysis methods such as solving differential equations using Laplace transforms.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: International Publication No. 2016 / 047330

[0009] Non-Patent Document 1: Daisuke Nakazawa, Seiji Watanabe, Daiki Fukui: "Analysis of the Tension Behavior of Elevator Ropes Considering Rope Slip", "Recent Technologies and Advancements in Elevators / Amusement Facilities, etc.", Proceedings of the Technical Symposium of the Japan Society of Mechanical Engineers, (2016), pp. 45-50

[0010] Non-Patent Document 2: Aya Shibayama, Takayoshi Kamata, Akira Ogawa, Tomohiro Shiki: "Analysis of Tension Variation of Main Ropes for Elevators Caused by Deviation of Groove Depth of Traction Machines", "Recent Technologies and Advancements in Elevators / Amusement Facilities, etc.", Proceedings of Technical Lectures of the Japan Society of Mechanical Engineers, (2021) Summary of the Invention

[0011] Problems to be Solved by the Invention

[0012] In the above-described conventional modeling technique for a rope based on a single spring, it is efficient in terms of simulating and calculating the rope tension. However, there is a problem that the simulation accuracy of the rope tension is insufficient.

[0013] The present disclosure has been completed to solve the above-described problems, and an object thereof is to obtain an elevator state monitoring method, a state monitoring program, a recording medium, and a state monitoring device related to an elevator state monitoring technique capable of estimating more accurate tension through simple processing.

[0014] Means for Solving the Problems

[0015] The elevator state monitoring method of the present disclosure includes the following tension calculation step: For each of the multiple ropes that are wound around a pulley having multiple grooves and suspend a car and a counterweight, the winding side portion and the payout side portion with respect to the pulley are respectively modeled as springs, and the tension of each of the multiple ropes is calculated using a tension model composed of multiple equations of motion. The tension model takes discrete tension data and multiple parameters as input data. The discrete tension data includes the measured values of the tensions of the respective ropes in a state where the car is at a measured position in the hoistway. The tension model takes continuous tension data as output data. The continuous tension data is continuous data of the tensions of the respective ropes including the estimated values of the tensions of the respective ropes in a state where the car is at a position other than the measured position. In the tension model, the displacement amount given to the pulley side end portions in each winding side portion and each payout side portion is set to a value obtained by subtracting the rope elongation amount in the winding amount from the winding amount based on the pulley, that is, the rope free length.

[0016] The state monitoring device of the elevator of the present disclosure has a monitoring device main body. For each of the multiple ropes that are wound around a pulley having multiple grooves and suspend a car and a counterweight, the winding side portion and the payout side portion relative to the pulley are respectively modeled as springs, and the tensions of the multiple ropes are calculated using a tension model composed of multiple equations of motion. The tension model takes discrete tension data and multiple parameters as input data. The discrete tension data includes the measured values of the tensions of the respective ropes in a state where the car is at a measured position in the hoistway. The tension model takes continuous tension data as output data. The continuous tension data is continuous data of the tensions of the respective ropes including the estimated values of the tensions of the respective ropes in a state where the car is at a position other than the measured position. In the tension model, the displacement amount given to the pulley side end portions in each winding side portion and each payout side portion is a value obtained by subtracting the rope elongation amount in the winding amount from the winding amount based on the pulley, that is, the rope free length.

[0017] Advantages of the Invention

[0018] According to the present disclosure, more accurate tension can be estimated by simple processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an explanatory diagram showing an equivalent model of a rope passing over a pulley.

[0020] Figure 2 It is Figure 1 The equivalent model of is replaced with a model in a one-dimensional coordinate system and shown in an explanatory diagram.

[0021] Figure 3 It is an explanatory diagram showing the behavior of the Figure 1 winding side portion modeled by multiple different methods.

[0022] Figure 4 It is Figure 1 The rope of is divided into a winding side portion and a payout side portion and shown in an explanatory diagram.

[0023] Figure 5 It is an explanatory diagram showing the behavior of two winding side portions with different tensions acting thereon for different multiple models.

[0024] Figure 6 It is Figure 5 A table showing the evaluation results of three models in.

[0025] Figure 7 It is an explanatory diagram showing an example of a model of an elevator.

[0026] Figure 8 It is a graph showing the relationship between the tensions of two ropes and the car position when the depths of two grooves are equal.

[0027] Figure 9 It is a graph showing the relationship between the tensions of two ropes and the car position when there is a 0.2 mm difference in the depths of two grooves.

[0028] Figure 10 It is a graph showing a comparison between the calculated values of the tensions of two ropes and the car position when there is a 0.7 mm difference in the depths of two grooves and multiple measured values.

[0029] Figure 11 It is a structural diagram of an elevator in a 1:1 rope winding mode where multiple ropes are wound around a pulley in a double-loop manner.

[0030] Figure 12 It is to Figure 11 show a graph comparing the relationship between the calculated values of the tensions in the elevator and the car position with multiple measured values.

[0031] Figure 13 It is an explanatory diagram showing the relationship between the tension model in Embodiment 1 and the input / output data.

[0032] Figure 14 It is a block diagram showing the state monitoring device of the elevator in Embodiment 1.

[0033] Figure 15 It is to show Figure 14 the flowchart of the operation of the operation unit.

[0034] Figure 16 It is to show Figure 15 the flowchart of the operation of the processing part of the tension model.

[0035] Figure 17 It is an explanatory diagram showing the relationship between the tension model in Embodiment 2 and the input / output data.

[0036] Figure 18 It is a flowchart showing a part of the operation of the state monitoring device in Embodiment 2.

[0037] Figure 19 It is an explanatory diagram showing the relationship between the tension model in Embodiment 3 and the input / output data.

[0038] Figure 20 It is a flowchart showing a part of the operation of the state monitoring device in Embodiment 4.

[0039] Figure 21 It is a flowchart showing a part of the operation of the state monitoring device of the first modification example in Embodiment 4.

[0040] Figure 22It is a flowchart showing a part of the operation of the state monitoring device according to the second modification of Embodiment 4.

[0041] Figure 23 It is a flowchart showing a part of the operation of the state monitoring device according to Embodiment 5.

[0042] Figure 24 It is a flowchart showing a part of the operation of the state monitoring device according to Embodiment 6.

[0043] Figure 25 It is a flowchart showing a part of the operation of the state monitoring device according to Embodiment 7.

[0044] Figure 26 It is a flowchart showing a part of the operation of the state monitoring device according to the modification of Embodiment 7.

[0045] Figure 27 It is a flowchart showing the maintenance period calculation process of the state monitoring device according to Embodiment 8.

[0046] Figure 28 It is a flowchart showing the maintenance period monitoring process of the state monitoring device according to Embodiment 8.

[0047] Figure 29 It is an explanatory diagram showing the relationship between the tension model and the input / output data in the modification of Embodiment 8.

[0048] Figure 30 It is a flowchart showing the maintenance period monitoring process of the modification of Embodiment 8.

[0049] Figure 31 It is a flowchart showing a part of the operation of the state monitoring device according to Embodiment 10.

[0050] Figure 32 It is a structural diagram showing the first example of the processing circuit that realizes each function of the monitoring device main body according to Embodiments 1 to 10.

[0051] Figure 33 It is a structural diagram showing the second example of the processing circuit that realizes each function of the monitoring device main body according to Embodiments 1 to 10. Detailed Embodiments

[0052] Hereinafter, the embodiments will be described with reference to the drawings.

[0053] Embodiment 1

[0054] As a model (mechanical model) of a rope wound around a pulley, the finite element method (FEM: Finite Element Method), the multi-body method, etc. are considered. However, the computational load of these methods is high and they lack generality. Therefore, a simple model in which the rope is regarded as a single spring is constructed.

[0055] First, consider the simplest model in which a single rope is wound around a single pulley. Figure 1 It is an explanatory diagram showing an equivalent model of the rope passing over the pulley. Figure 2 It is Figure 1 An explanatory diagram showing the equivalent model replaced by a one-dimensional coordinate system.

[0056] In the figure, a rope 11 is wound around a pulley 10. The pulley 10 rotates counterclockwise in the figure. The moving direction of the rope 11 is determined corresponding to the rotation direction of the pulley 10. In particular, in Figure 2 the model of the rope 11 in the one-dimensional coordinate system shown, corresponding to the rotation direction of the pulley 10, the wound side portion and the payout side portion of the rope 11 move in the same direction.

[0057] In the equivalent model of the rope, as Figure 1 and Figure 2 shown, the rope 11 is assumed to be composed of three parts: a wound side portion, a payout side portion, and a portion that moves integrally with the pulley 10. More precisely, the portion that moves integrally with the pulley 10 refers to the portion that exists on the pulley 10 and can move integrally with the pulley 10.

[0058] In the following drawings, a subscript i is attached to a variable related to the wound side portion of the rope 11 with the meaning that it is a label on the input side. The wound side portion is the portion of the rope 11 that is upstream of the pulley 10 in the moving direction of the rope 11.

[0059] In addition, a subscript o is attached to a variable related to the payout side portion of the rope 11 with the meaning that it is a label on the output side. The payout side portion of the rope 11 is the portion of the rope 11 that is downstream of the pulley 10 in the moving direction of the rope 11.

[0060] When the rope 11 is wound by a small winding amount Δx due to a small rotation of the pulley 10, the winding amount Δx is expressed as the sum of the free length ΔLi of the rope and the elongation amount Δui of the rope. The free length ΔLi of the rope is the length in the state where no tension is applied.

[0061] That is, the winding amount Δx corresponds to the rope displacement amount in the state where tension is applied, and becomes a value obtained by adding the rope elongation amount based on the tension to the rope displacement amount in the state where no tension is applied, that is, the free length ΔLi of the rope. Also, asFigure 2 As shown, with respect to the winding side portion, the feeding side portion, and the portion that moves integrally with the pulley, the rope displacement amounts in the state where no tension is applied are respectively the same rope free length ΔLi.

[0062] Δx = ΔLi + Δui (1.1)

[0063] The rope elongation amount Δui of the winding side portion is obtained based on the tension Ti of the winding side portion. In contrast, since the tension of the feeding side portion is To, the rope elongation amount Δuo of the feeding side portion is different from the rope elongation amount Δui of the winding side portion.

[0064] Therefore, the minute slip amount of the rope 11 on the pulley 10, that is, the creep amount Δcr, becomes the difference in rope elongation amounts Δuo - Δui with respect to the rope free length ΔLi.

[0065] Δx + Δcr = (ΔLi + Δui) + (Δuo - Δui) = ΔLi + Δuo (1.2)

[0066] The lower ends of the winding side portion and the feeding side portion are associated with the treatment of the rope elongation amount, and the following behavior has been experimentally confirmed using an actual machine. In addition, in Figure 1 , xi represents the displacement of the lower end of the winding side portion. In addition, xo represents the displacement of the lower end of the feeding side portion.

[0067] In addition, the behavior that can be focused on here, that is, the behavior of the lower ends of the winding side portion and the feeding side portion associated with the treatment of the rope elongation amount, is the key point for being able to propose a model of a rope and an elevator with excellent characteristics this time.

[0068] · The lower end of the winding side portion rises by the same amount as the winding amount Δx of the rope 11 on the pulley 10.

[0069] · The lower end of the feeding side portion generally descends by an amount different from the winding amount Δx on the pulley 10.

[0070] Figure 3 is an explanatory diagram showing the behavior of the winding side portion of the rope 11 that has been modeled by multiple different methods. In particular, as an explanatory diagram effective in terms of the model of the rope 11 proposed as the method of Embodiment 1 this time, showing the Figure 1 here and the Figure 3 shown later and the Figure 5 .

[0071] In Figure 3In (a), a multi-agent model is shown. In the multi-agent model, the winding side portion is divided into a plurality of micro intervals. Further, in the multi-agent model, when the upper end of the winding side portion is wound by Δx, the lower end of the winding side portion rises by Δx.

[0072] Here, the minute winding amount Δx is separated into the free length ΔLi of the rope and the elongation amount Δui of the rope. When the spring constant determined by the length of the winding side portion before winding is set as ki, after winding, the length of the winding side portion becomes shorter by Δx. Therefore, the spring constant after winding changes to k'i. At this time, k'i > ki. In addition, in the following description, the spring constant is sometimes referred to as rope rigidity.

[0073] In Figure 3 (a'), the winding side portion of the rope 11 modeled as one spring is shown. In this model, when the upper end of the winding side portion is wound by Δx, the lower end of the winding side portion also rises by Δx. Further, in this model, the spring constant remains ki. However, actually, the spring constant changes to k'i.

[0074] In Figure 3 (b), a model in which the spring constant in the model of (a') is changed to k'i is shown. The position of the upper end of the winding side portion is the same as that in the model of (a'). The lower end of the winding side portion rises by Δui with respect to the model of (a'). This is the following effect: The rope rigidity rises from ki to k'i, and thereby, the deflection amount of the winding side portion decreases.

[0075] The behavior of the lower end of the winding side portion is actually the same as that in the model of (a). However, in the model of (b), the behavior of the lower end of the winding side portion is different from the actual behavior that can be confirmed by the actual machine.

[0076] In Figure 3 (c), a model of the rope 11 used in Embodiment 1 is shown. In this model, compared with the models of (a), (a'), and (b), the position of the upper end of the winding side portion is lower. In the model of (c), the position of the lower end of the winding side portion is the same as that in the models of (a) and (a').

[0077] Figure 4 is an explanatory diagram showing an equivalent model of Figure 1 divided into a winding side portion and a feeding side portion. In Figure 4 the winding side portion and the feeding side portion are respectively modeled as independent springs. Thereby, for the spring force (i.e., tension) determined by the displacement difference between both ends of each spring, the force balance condition can be considered.

[0078] In Figure 4In the equation, yi represents the displacement of the upper end of the winding side portion. In addition, yo represents the displacement of the upper end of the delivery side portion. The relational expression for the winding side portion at rest, that is, before winding, is given by the following equation.

[0079] Ti=ki(yi-xi)=(EA / Li)(0-x'i)(1.3)

[0080] Here, ki is the rope rigidity of the winding side portion, yi is the displacement of the upper end of the winding side portion, xi is the displacement of the lower end of the winding side portion, Li is the length of the winding side portion, E is the Young's modulus of the rope 11, and A is the cross-sectional area of ​​the cross section of the rope 11 perpendicular to the length direction.

[0081] In addition, x'i is the initial elongation of the lower end of the winding side portion, which is a negative value. The coordinate system in this case is defined by assuming that the displacement in the upward direction is positive. The rope rigidity ki of the winding side portion is a function of the Young's modulus E, the cross-sectional area A, and the length Li of the winding side portion.

[0082] The winding-side portion is wound around the pulley 10 while receiving the tension Ti, so the following relational expression is obtained.

[0083] Ti=(EA / ΔLi)Δui(1.4)

[0084] When the winding side portion is slightly wound around the pulley 10 by Δx, regardless of the rope rigidity, as Figure 2 and Figure 3 As shown in FIG. 1 , the lower end of the winding side portion rises by Δx. Therefore, the force balance after winding by Δx is given by the following formula.

[0085] Ti=(EA / (Li-ΔLi))(yi-xi)

[0086] =(EA / (Li-ΔLi)){yi-(x'i+Δx)}(1.5)

[0087] The tension Ti of the winding side portion is calculated based on the displacement difference yi-xi between the upper end and the lower end of the winding side portion. In addition, based on this formula, the relationship that the displacement yi of the upper end of the winding side portion should satisfy is obtained.

[0088] yi=(Ti / EA)(Li-ΔLi)+x'i+Δx(1.6)

[0089] When the above equation is rearranged using equations (1.1), (1.3), and (1.4), the following equation is obtained.

[0090] yi=(Ti / EA)(Li-ΔLi)-(Ti / EA)Li+ΔLi+Δui

[0091] = -(Ti / EA)ΔLi + ΔLi + Δui

[0092] = -Δui + ΔLi + Δui = ΔLi(1.7)

[0093] Therefore, the displacement yi at the upper end of the winding side portion during minute winding needs to be set to the free length ΔLi of the rope in the winding amount Δx, rather than the winding amount Δx, i.e., ΔLi + Δui. Thus, the displacement xi at the lower end of the winding side portion becomes the winding amount Δx, and the result corresponding to Figure 3 (a) of

[0094] In this way, in the method of Embodiment 1, i.e., Figure 3 (c) of

[0095] Figure 5 is an explanatory diagram showing the behavior of two winding side portions with different tensions acting on multiple different models. In Figure 5 , (a), (b), and (c) are models corresponding to Figure 3 (a), (b), and (c) of

[0096] In the model of (a), even if the tensions are different, i.e., Ti1 and Ti2, the lower ends of the two winding side portions are displaced upward by the same distance Δx as the winding amount Δx.

[0097] On the other hand, in the model of (b), the displacement of the upper ends of the two winding side portions is Δx. In contrast, the lower end of one winding side portion is displaced upward by Δx + Δui1, and the lower end of the other winding side portion is displaced upward by Δx + Δui2.

[0098] In an actual elevator, the lower ends of the two winding side portions are connected to the car or the counterweight, and the displacement amounts are the same. Therefore, for the winding side portion with a tension Ti1 smaller than the tension Ti2, the lower end is pulled up excessively, resulting in slack and a decrease in tension. In addition, for the winding side portion with a tension Ti2, the lower end is pulled down, increasing the tension.

[0099] In this way, in the model of (b), when the same winding amount Δx is given to the two winding side portions with different tensions, by applying a binding force that makes the lower end positions consistent for the deviation at the lower end, the result is a change in tension.

[0100] In contrast, in the model of (c), the upward pull amounts of the upper ends of the two winding side portions are not the same Δx, but become the free lengths ΔLi1 and ΔLi2 of the ropes on the pulley 10 corresponding to the tensions, which are different from each other. By correcting this upward pull amount, the displacement amounts of the lower ends of the two winding side portions both become Δx, consistent with the model of (a).

[0101] Figure 6 It is a table showing the evaluation results of three models in Figure 5 . In the multi-agent method of (a), the winding behavior can be accurately modeled. However, the rope 11 needs to be divided into multiple segments, the model becomes complex, and the calculation time increases.

[0102] On the other hand, in the methods of (b) and (c) where the rope 11 is modeled as a spring, the model is simple and the calculation load is low. However, in the model of (b), the tension on the winding side part cannot be correctly evaluated. In contrast, in the model of (c) proposed as the method of Embodiment 1 this time, the tension on the winding side part is accurately evaluated.

[0103] The model of (c) is a simple model, so the calculation load is low. In a maintenance operation portable PC (Personal Computer) or control panel (CP: Control Panel) with memory constraints, it is also possible to easily calculate the tension change for each car position of all ropes in real time.

[0104] Therefore, at the maintenance site, by using the tension measurement data at limited car positions, it is possible to grasp the tension of each car position of all ropes, and the maintenance time can be shortened.

[0105] Next, the pay-out side part will be described. According to Figure 4 , the relational expression related to the pay-out side part at rest is as follows.

[0106] To = ko(yo - xo) = (EA / Lo)(0 - x'o)(1.8)

[0107] Here, ko is the rope stiffness of the pay-out side part, yo is the displacement of the upper end of the pay-out side part, xo is the displacement of the lower end of the pay-out side part, Lo is the length of the pay-out side part, E is the Young's modulus of the rope 11, and A is the cross-sectional area of the cross-section of the rope 11 perpendicular to the length direction.

[0108] In addition, x'o is the initial elongation of the lower end of the pay-out side part and is a negative value. The rope stiffness ko of the pay-out side part is a function of the Young's modulus E, the cross-sectional area A, and the length Lo of the pay-out side part.

[0109] When Δx is wound on the winding side part, the free length of the rope on the deflector pulley 10 of the pay-out side part becomes longer by ΔLi. In addition, due to the tension To of the pay-out side part, the free length ΔLi of the rope of the pay-out side part elongates by Δuo.

[0110] To = (EA / ΔLi)Δuo(1.9)

[0111] Therefore, when the rope 11 is slightly wound by Δx around the pulley 10, at the lower end of the payout side portion, it is displaced downward by ΔLi + Δuo. The force balance of the payout side portion after winding by Δx is given by the following equation.

[0112] To = (EA / (Lo + ΔLi))(yo - xo)

[0113] = (EA / (Lo + ΔLi)){yo - (x'o - ΔLi - Δuo)}(1.10)

[0114] The tension To of the payout side portion is calculated based on the displacement difference yo - xo between the upper end and the lower end of the payout side portion. In addition, according to this equation, the relational expression that the displacement yo of the upper end of the payout side portion should satisfy is obtained.

[0115] yo = (To / EA)(Lo + ΔLi) + x'o - ΔLi - Δuo(1.11)

[0116] Using equations (1.11), (1.8), and (1.9) to arrange the above equation.

[0117] yo = (To / EA)(Lo + ΔLi) - (To / EA)Lo - ΔLi - Δuo

[0118] = (To / EA)ΔLi - ΔLi - Δuo

[0119] = Δuo - ΔLi - Δuo = -ΔLi(1.12)

[0120] According to this equation, the displacement yo given to the upper end of the rope rigidity ko of the payout side portion needs to be set to the rope free length -ΔLi in the winding amount, rather than the winding amount -Δx. As a result, the displacement xo of the lower end of the payout side portion becomes the payout amount ΔLi + Δuo.

[0121] In addition, the displacement xo of the lower end of the payout side portion is ΔLi + Δuo, which is different from the displacement Δx = ΔLi + Δui of the lower end of the winding side portion. This difference is the creep amount Δcr of the rope 11 on the pulley 10.

[0122] Δcr = Δuo - Δui = (ΔLi / EA)(To - Ti)(1.13)

[0123] As Figure 1 shown, the research so far is the formulation in the case of the counterclockwise rotation of the pulley 10 along Figure 1 . On the other hand, when considering the relational expression in the case of the clockwise rotation of the pulley 10 along Figure 1 , by defining the winding amount Δx as a negative value, the counterclockwise relational expression can be directly used. However, the tension of the winding side portion becomesFigure 1 To, therefore, it is necessary to replace Ti in Equation (1.4) with Figure 1 To.

[0124] In addition, in Figure 1 , a structure is shown in which the rope 11 is wound around the upper part of the pulley 10 and the rope 11 is stretched downward. However, the derived relational expression does not change even in a structure in which the rope 11 is wound around the lower part of the pulley 10 and the rope 11 is stretched upward.

[0125] Based on the above results, the winding model of the rope 11 around the pulley 10 can be organized as follows.

[0126] · Assume that the counterclockwise rope displacement on the pulley 10 is positive and the clockwise rope displacement is negative, and set the sign of the winding amount Δx according to the direction of rotation

[0127] · The rope stiffness ki of the winding side part is defined as the value obtained by dividing the product of the Young's modulus E of the rope 11 and the cross-sectional area A by the length Li of the winding side part

[0128] · The rope stiffness ko of the feeding side part is defined as the value obtained by dividing the product of the Young's modulus E of the rope 11 and the cross-sectional area A by the length Lo of the feeding side part

[0129] · When calculating the rope stiffnesses ki and ko, the lengths Li and Lo are set to the rope free length where the rope 11 is not subjected to tension

[0130] · The tension Ti of the winding side part is defined as the value obtained by multiplying the rope stiffness ki by the displacement difference yi - xi between the upper and lower ends

[0131] · The tension To of the feeding side part is defined as the value obtained by multiplying the rope stiffness ko by the displacement difference yo - xo between the upper and lower ends

[0132] · The displacement of the end portion on the pulley 10 side in the winding side part is defined as the value obtained by subtracting the rope elongation amount Δui of the winding side part from the minute winding amount Δx of the rope 11 on the pulley 10, and is equivalent to the rope free length ΔLi with respect to the winding amount Δx

[0133] · The displacement of the end portion on the pulley 10 side in the feeding side part is defined as the value obtained by subtracting the rope elongation amount Δui of the winding side part from the minute winding amount Δx of the rope 11 on the pulley 10, and is equivalent to the rope free length ΔLi with respect to the winding amount Δx

[0134] · The rope elongation amount on the above-mentioned pulley 10 is calculated based on the tension Ti of the winding side part

[0135] Next, Figure 7 is an explanatory diagram showing an example of a model of an elevator. InFigure 7 Among them, as the simplest model, a model with a 1:1 rope winding method and one rope is shown.

[0136] Here, the model (c) of the rope described above is further incorporated into the model of the elevator for explanation. That is, here, as the model of the elevator, an elevator is envisioned as follows: The car 12 and the counterweight 13 are each suspended in a bucket - type manner by the rope 11 using the pulley 10 as a sheave. By winding or paying out the rope 11 through the pulley 10, the car 12 and the counterweight 13 perform lifting and lowering movements.

[0137] Each element of the elevator is modeled as a spring - mass system. The rope 11 is modeled as a mass point element on the pulley 10, and the winding part side and the payout part side are each modeled as spring elements.

[0138] In Figure 7 where Js is the inertia moment of the pulley 10, Jr is the inertia moment of the rope 11 on the pulley 10. Jr is the inertia moment based on mass related to the rope part that moves integrally with the pulley 10. Mc is the mass of the car 12, Mw is the mass of the counterweight 13, msc is the mass of the car - side hook 14, and msw is the mass of the counterweight - side hook 15. These are parameters related to the inertia elements.

[0139] mrc is the mass of the car - side part of the rope 11, and mrw is the mass of the counterweight - side part of the rope 11. The car - side part is the part of the rope 11 that is on the car 12 side of the pulley 10. The counterweight - side part is the part of the rope 11 that is on the counterweight 13 side of the pulley 10. Similarly to the above, these are also parameters related to the inertia elements.

[0140] ksc is the stiffness of the car - side hook 14, ksw is the stiffness of the counterweight - side hook 15, krc is the stiffness of the car - side part of the rope 11, and krw is the stiffness of the counterweight - side part of the rope 11. These are parameters related to the stiffness elements.

[0141] θs is the rotation angle of the pulley 10, θr is the rotation angle of the rope 11 on the pulley 10. xc is the displacement of the car 12, xw is the displacement of the counterweight 13, xsc is the displacement of the car - side hook 14, xsw is the displacement of the counterweight - side hook 15, xrc is the displacement of the car - side part of the rope 11, and xrw is the displacement of the counterweight - side part of the rope 11.

[0142] The equation of motion represented by a differential equation without considering the damping term based on the damping element is as follows. Here, as the operator representing the second - order differential operation with respect to time t, d^2 / dt^2 is used.

[0143] Mc(d² / dt²)xc - ksc(xsc - xc) = -Mc g (1.14)

[0144] Mw(d² / dt²)xw - ksw(xsw - xw) = -Mw g (1.15)

[0145] msc(d² / dt²)xsc + ksc(xsc - xc) - krc(xrc - xsc)

[0146] = -msc g (1.16)

[0147] msw(d² / dt²)xsw + ksw(xsw - xw) - krw(xrw - xsw)

[0148] = -msw g (1.17)

[0149] mrc(d² / dt²)xrc + krc(xrc - xsc) - krc(-Rθr - xrc)

[0150] = -mrc g (1.18)

[0151] mrw(d² / dt²)xrw + krw(xrw - xsw) - krw(Rθr - xrw)

[0152] = -mrw g (1.19)

[0153] Js(d² / dt²)θs = τ - λ (1.20)

[0154] Jr(d² / dt²)θr - krcR(-Rθr - xrc) + krwR(Rθr - xrw)

[0155] = λ (1.21)

[0156] In addition, R is the radius of the pulley 10, and g is the acceleration due to gravity. Further, τ is the driving torque applied to the pulley 10, and λ is the constraint torque acting between the pulley 10 and the rope 11.

[0157] On the pulley 10, the pulley 10 and the rope 11 move integrally within the range of the ultimate traction ratio Γ. The ultimate traction ratio Γ is given as a function of the coefficient of friction between the pulley 10 and the rope 11 and the winding angle of the rope 11 relative to the pulley 10.

[0158] At this time, the condition satisfied by the ratio of the tension Ti in the wound side portion to the tension To in the pay - out side portion of the rope 11 and the constraint condition equation are given by the following formula. Here, as the operator representing the first - order differential operation with respect to time t, d / dt is used.

[0159] (1 / Γ) < (To / Ti) < Γ(1.22)

[0160] (d / dt)θs - (d / dt)θr = 0(1.23)

[0161] The constraint torque λ acts on the pulley 10 and the rope 11 as a force that satisfies the above equation. On the other hand, when the tension ratio To / Ti exceeds the limit traction ratio Γ, the rope 11 slides relative to the pulley 10 while the frictional force acts, and thus, a difference occurs between the rotational speed of the pulley 10 and the rotational speed of the rope 11.

[0162] (d / dt)θs - (d / dt)θr ≠ 0(1.24)

[0163] Next, the behavior when the car 12 descends, that is, when the pulley 10 rotates counterclockwise along Figure 7 will be described. Consider the equilibrium state at time t + Δt after a small time Δt has elapsed from the equilibrium state at time t. When the car 12 descends by a small time Δt, the winding amount Δx on the pulley 10 is given by the following equation.

[0164] Δx = RΔθr = ΔL + Δu(1.25)

[0165] Here, ΔL is the free length of the rope with respect to the small winding amount Δx when the car 12 descends, that is, the length of the rope in a state where no tension is acting. In addition, Δu is the elongation amount of the rope with respect to the small winding amount Δx when the car 12 descends.

[0166] In addition, a plurality of grooves are provided on the outer periphery of the pulley 10. The corresponding ropes 11 are inserted into each groove. Each groove is cut by the rope 11 over the years. The radius R is the radius of the pulley 10 at each groove. Therefore, when the cutting amounts in the plurality of grooves are different from each other, the radius R varies slightly according to the groove.

[0167] Due to such a difference in the radius R, a difference in the winding amount occurs, and a tension difference is generated between the plurality of ropes 11.

[0168] When the tension acting on the counterweight side portion of the rope 11 is set as Tw, Δu satisfies the following equation.

[0169] Tw = (EA / ΔL)Δu → Δu = (Tw / EA)ΔL(1.26)

[0170] Thus, the free length ΔL of the rope can be obtained from the small winding amount Δx.

[0171] Δx = (1 + (Tw / EA))ΔL → ΔL = Δx / (1 + (Tw / EA))(1.27)

[0172] According to this formula, the length Lc of the car side portion in the rope 11 and the length Lw of the counterweight side portion in the rope 11 are respectively given by the following formulas.

[0173] Lo(t + Δt) = Lc(t + Δt) = Lc(t) + ΔL,

[0174] Li(t + Δt) = Lw(t + Δt) = Lw(t) - ΔL(1.28)

[0175] The winding amount, the corresponding rope free length, and the rope elongation amount at time t + Δt are respectively given by the following formulas.

[0176] x(t + Δt) = x(t) + Δx,

[0177] L(t + Δt) = L(t) + ΔL,

[0178] u(t + Δt) = u(t) + Δu(1.29)

[0179] The amount x(t + Δt) = Rθr(t + Δt) wound by the rope pulley 10 includes the rope elongation amount. However, in order to calculate the tension generated in the winding side portion of the rope 11 and the tension generated in the payout side portion of the rope 11, instead of directly using Rθr as the winding amount, it is necessary to set it as the rope free length L.

[0180] The rope free length L can be obtained by the following formula.

[0181] x(t + Δt) = Rθr(t + Δt)

[0182] = L(t + Δt) + u(t + Δt) → L = Rθr - u(1.30)

[0183] Thus, the tension Ti generated in the winding side portion of the rope 11 is given by the following formula.

[0184] Ti = Tw = ki(L - xrw)

[0185] = krw(L - xrw) = krw(Rθr - u - xrw)(1.31)

[0186] In addition, the tension To generated in the payout side portion of the rope 11 is given by the following formula.

[0187] To = ko(-L - xrc)

[0188] = krc(-L - xrc) = krc(-Rθr + u - xrc)(1.32)

[0189] According to these formulas, the winding amount portions in the motion equations (1.18), (1.19), and (1.21) are corrected as follows.

[0190] Rθr → Rθr - u(1.33)

[0191] Next, the behavior when the car 12 ascends, that is, when the pulley 10 rotates clockwise along Figure 7 will be described. When the car 12 ascends for a short time Δt, the winding amount Δx on the pulley 10 is given by the following formula. Also, let Figure 7 the counterclockwise direction be positive. Therefore, when the pulley 10 rotates clockwise along Figure 7 , the winding amount Δx becomes negative.

[0192] Δx = Rθr = ΔL + Δu(1.34)

[0193] Here, Δu is the rope elongation amount with respect to the small winding amount Δx when the car 12 ascends, and it is negative.

[0194] When the tension on the car side part of the rope 11 is set as Tc, Δu satisfies the following formula.

[0195] Tc = (EA / ΔL)Δu → Δu = (Tc / EA)ΔL(1.35)

[0196] Thus, the rope free length ΔL can be obtained from the small winding amount Δx.

[0197] Δx = (1 + (Tc / EA))ΔL → ΔL = Δx / (1 + (Tc / EA))(1.36)

[0198] According to this formula, the length Lc of the car side part in the rope 11 and the length Lw of the counterweight side part in the rope 11 are respectively given by the following formulas.

[0199] Li(t + Δt) = Lc(t + Δt) = Lc(t) + ΔL,

[0200] Lo(t + Δt) = Lw(t + Δt) = Lw(t) - ΔL(1.37)

[0201] Here, since the free length ΔL is negative, the length of the rope on the car side part decreases, and the length of the rope on the counterweight side part increases.

[0202] The rope free length L when the car 12 ascends can be obtained by the following formula.

[0203] x(t + Δt) = Rθr(t + Δt)

[0204] = L(t + Δt) + u(t + Δt) → L = Rθr - u(1.38)

[0205] Thus, the tension Ti generated in the winding side portion of the rope 11 is given by the following equation.

[0206] Ti = Tc = ki(-L - xrc)

[0207] = krc(-L - xrc) = krc(-Rθr + u - xrc) (1.39)

[0208] In addition, the tension To generated in the unwinding side portion of the rope 11 is given by the following equation.

[0209] To = ko(L - xrw)

[0210] = krw(L - xrw) = krw(Rθr - u - xrw) (1.40)

[0211] Based on these equations, the winding amount portions in the motion equations (1.18), (1.19), and (1.21) are corrected as follows.

[0212] Rθr → Rθr - u (1.41)

[0213] Based on the above results, the tension model as a generalized model of rope winding can be defined as follows. Thus, the tension model consists of multiple motion equations. In addition, in this specification and the claims, the analysis model related to the rope tension is simply referred to as the tension model.

[0214] Regardless of the traveling direction of the car 12, the rope length Lc on the car 12 side and the rope length Lw on the counterweight 13 side are obtained by the following equations respectively. That is, the lengths of the winding side portion and the unwinding side portion are calculated based on the rope free length ΔL.

[0215] Lc(t + Δt) = Lc(t) + ΔL, Lw(t + Δt) = Lw(t) - ΔL (1.42)

[0216] Here, ΔL satisfies the following equation.

[0217] When the car descends: ΔL = equation (1.27), when the car ascends: ΔL = equation (1.36) (1.43)

[0218] The winding amount portions in the motion equations (1.18), (1.19), and (1.21) are corrected as follows.

[0219] Rθr → L = Rθr - u (1.44)

[0220] As shown in equations (1.27) and (1.36), the rope free length ΔL is a function of the winding amount Δx and the tension Ti in the winding side portion.

[0221] Here, the relationship of the correction amount u with respect to a small time becomes the following equation.

[0222] u(t + Δt) = u(t) + Δu(1.45)

[0223] When the car descends: Δu = Equation (1.26), when the car ascends: Δu = Equation (1.35)(1.46)

[0224] As shown in Equation (1.26) and Equation (1.35), the rope elongation amount Δu is a value proportional to the rope free length ΔL and the tension Ti of the winding side portion.

[0225] The above relationship also holds when there is one or more pulleys in addition to the pulley 10 serving as a sheave, and further holds regardless of the number of ropes 11.

[0226] Next, as an example, calculation results in a structure where two ropes 11 are wound around the pulley 10 in a single loop manner in a 1:1 rope winding type elevator are shown. In the following calculations, the car position is changed respectively to obtain the tensions of the two ropes 11 when the depths of the two grooves are equal to each other and when the depths of the two grooves are different from each other.

[0227] Figure 8 It is a graph showing the relationship between the tensions of the two ropes 11 and the car position when the depths of the two grooves are equal. Figure 9 It is a graph showing the relationship between the tensions of the two ropes 11 and the car position when there is a difference of 0.2 mm in the depths of the two grooves. Figure 10 It is a graph showing a comparison between the calculated values of the tensions of the two ropes 11 and the car position when there is a difference of 0.7 mm in the depths of the two grooves and multiple measured values.

[0228] In Figure 8 , Figure 9 and Figure 10 , the car 12 travels back and forth from the uppermost floor to the lowermost floor. In addition, Car1 shows the tension of the car side portion in one rope 11. Car2 shows the tension of the car side portion in the other rope 11. CWT1 shows the tension of the counterweight side portion in one rope 11. CWT2 shows the tension of the counterweight side portion in the other rope 11. In addition, the measured values of each tension are values obtained by measuring the tension acting on the hook spring.

[0229] When the depths of the two grooves are equal to each other, as Figure 8 shown, regardless of the car position, the tension shows a fixed value.

[0230] On the other hand, the depths of the two grooves being different from each other is equivalent to the radius R of the pulley 10 in the equation of motion being different for each rope 11. When there is a difference in the depths of the two grooves, as Figure 9 shown, the tensions when the car 12 ascends and descends depict different trajectories from each other. In Figure 9 , the grooves corresponding to Car2 and CWT2 are deeper than the grooves corresponding to Car1 and CWT1.

[0231] In the case where the winding amount is calculated using a model that does not consider the rope elongation amount, even under the condition that the groove depths are the same, due to the difference in the initial elongation amounts of the ropes that represent the deviation of the initial tension, the tension changes as the position of the car changes. As a result, it becomes different from the actual tension behavior where the tension does not change according to the car position.

[0232] When the difference in the depths of the two grooves becomes large, the tension ratio between the winding side portion and the payout side portion exceeds the limit traction ratio Γ, and the rope 11 slides relative to the pulley 10, as Figure 10 shown, and the slope of the tension variation changes midway. According to Figure 10 , according to the analysis method of Embodiment 1, it is possible to accurately calculate the tension variation including the rope sliding behavior.

[0233] In addition, since the limit traction ratio Γ is a function of the friction coefficient between the pulley 10 and the rope 11, when the friction coefficient changes, the limit traction ratio Γ also changes. This change in the limit traction ratio Γ is manifested as an offset of the inflection point where the slope of the tension variation changes. Therefore, by grasping the amount of offset of this inflection point, it is also possible to obtain the amount of change in the friction coefficient.

[0234] Figure 11 is a structural diagram of an elevator in a 1:1 rope winding method in which a plurality of ropes 11 are wound around the pulley 10 in a double-loop manner schematically. In the double-loop method, each rope 11 is wound around the pulley 10 as a sheave and the deflector sheave 16 twice. According to the analysis method of Embodiment 1, calculations can also be performed for the double-loop method.

[0235] Figure 12 is Figure 11 a diagram showing a comparison between the calculated value of the tension in the elevator and the relationship with the car position and a plurality of measured values. Figure 12 The horizontal axis of is a value obtained by non-dimensionalizing the car position through the lifting stroke. Figure 12 The vertical axis of is a value obtained by non-dimensionalizing the tension through the average tension at the intermediate floor.

[0236] Here, let the rope 11 passing through the groove with the normal depth be the normal groove rope, the rope 11 passing through the groove shallower than the normal depth be the shallow groove rope, and the rope 11 passing through the groove deeper than the normal depth be the deep groove rope.

[0237] In Figure 12 , the solid line represents the calculation result of the tension of the shallow groove rope. □ represents the measured value of the tension of the shallow groove rope when the car ascends. 〇 represents the measured value of the tension of the shallow groove rope when the car descends.

[0238] The dashed line represents the calculation result of the tension of the normal groove rope. △ represents the measured value of the tension of the normal groove rope when the car ascends. ▽ represents the measured value of the tension of the normal groove rope when the car descends.

[0239] The single dotted line represents the calculation result of the tension of the deep groove rope. ◇ represents the measured value of the tension of the deep groove rope when the car ascends. ◆ represents the measured value of the tension of the deep groove rope when the car descends.

[0240] As Figure 12 shown, it can be confirmed that even for a complex system structure such as the double-loop method, the tension can be calculated with high precision by the tension model as the analysis model.

[0241] In addition, in a simple system structure with one pulley 10, as the tension calculation method of Embodiment 1, without performing the analysis of numerically integrating the equation of motion, i.e., the time response analysis, the tension variation can be calculated by the static analysis based only on the force balance.

[0242] In addition, the static analysis mentioned here is the static analysis using the equation of motion from which the inertia term based on the inertia element and the damping term based on the damping element are deleted. Generally, the equation of motion includes the inertia term based on the inertia element, the stiffness term based on the stiffness element, and the damping term based on the damping element, and the analysis using this equation of motion is called the dynamic analysis. However, in this specification and the claims, the equation based on the force balance in the static analysis is also included in the scope of the equation of motion as a special case of the equation of motion.

[0243] However, when it becomes a complex system structure including the deflector pulley 16 and multiple pulleys such as the suspension pulley in the 2:1 rope winding method that are linked with the pulley 10 as the rope pulley, it is necessary to obtain the rotation amounts of the linked multiple pulleys through the convergence calculation. Therefore, the force balance condition cannot be simply obtained by the static analysis.

[0244] Therefore, in the tension calculation method of Embodiment 1, in the case of a complex system structure including multiple pulleys linked to the pulley 10, by numerically integrating the equation of motion, a convergence calculation is performed in a manner that always satisfies the equation of motion, and the rotation amounts of the multiple linked pulleys are obtained as the time history response.

[0245] Figure 13 FIG. is an explanatory diagram showing the relationship between the tension model in Embodiment 1 and the input / output data. In the state monitoring method of Embodiment 1, discrete tension data and multiple parameters are input to the above-mentioned tension model. Thereby, continuous tension data is output.

[0246] Among the multiple parameters, it includes various data related to the rope specifications and data related to the groove cutting amount.

[0247] Among the various data related to the rope specifications, it includes Young's modulus E, cross-sectional area A, rope diameter d, linear density ρ, number of ropes N, shackle rigidity ks, etc. At least one of these data, for example, the rope diameter d, can also be a fixed value. The data related to the groove cutting amount is the measured value of the depth of each groove.

[0248] The discrete tension data includes the measured values of the tensions of the respective ropes 11 in the state where the car 12 is at the measurement position in the hoistway, the rope numbers, and the information of the measurement position. The measurement position, that is, the car position when the tension is measured, is, for example, the middle floor or the bottom floor. In addition, the measurement position can also be two or more places. The rope numbers and the measurement position are associated with the measured values of the respective tensions. The measured value of each tension is, for example, a value read from a tension meter of the rope near the shackle.

[0249] In addition, it is not necessary to measure the tensions of all the ropes 11 at the same car position.

[0250] Furthermore, it is not necessary to measure the tensions of all the ropes 11. When the car 12 is at the top floor, only the tensions of the rope with the maximum tension and the rope with the minimum tension are measured. The rope with the maximum tension is the rope with the largest deformation amount of the shackle spring. The rope with the minimum tension is the rope with the smallest deformation amount of the shackle spring. In this case, regarding the remaining ropes as one spring, as a structure in which the car 12 is suspended by three ropes, it is also possible to equivalently evaluate.

[0251] The continuous tension data is continuous data of the tensions of all the ropes at all car positions. By using the tension model of Embodiment 1, continuous tension data can be obtained from the discrete tension data. The continuous tension data includes the tensions of all the ropes at the car positions where the actual measurement has not been performed, the rope numbers, and the car positions. The rope numbers and the car positions are associated with the calculated values of the respective tensions.

[0252] The elevator status monitoring method of Embodiment 1 includes a tension calculation step. In the tension calculation step, for each of the plurality of ropes 11, the winding side portion and the payout side portion relative to the pulley 10 are respectively modeled as springs. Then, the tensions of the plurality of ropes are calculated using a tension model composed of a plurality of equations of motion corresponding to these models. The plurality of ropes 11 are wound around the pulley 10 and suspend the car 12 and the counterweight 13.

[0253] The tension model takes discrete tension data and a plurality of parameters as input data and continuous tension data as output data. Further, in the tension model, the displacement amount applied to the upper end, which is the pulley side end portion in each winding side portion, is set as the rope free length ΔL. The rope free length ΔLi is a value obtained by subtracting the rope elongation amount Δu in the winding amount Δx from the winding amount Δx based on the pulley 10.

[0254] The status monitoring program of Embodiment 1 is a program that causes a computer to execute a status monitoring method including the above-described tension estimation method.

[0255] That is, the status monitoring program is a program that causes a computer to execute a tension estimation process. In the tension estimation process, the tensions of the plurality of ropes are calculated using the above-described tension model.

[0256] In addition, generally, a program is stored in a storage medium (e.g., Figure 33 the memory 202) in a readable form. Moreover, the process described in the program read from the storage medium is executed by a computer. The recording medium of Embodiment 1 is a computer-readable recording medium that records an elevator status monitoring program that causes a computer to execute a status monitoring method including the above-described tension estimation method.

[0257] Figure 14 is a block diagram showing the elevator status monitoring device of Embodiment 1. The status monitoring device has a monitoring device main body 20. As functional blocks, the monitoring device main body 20 has a data input unit 21, a storage unit 22, an arithmetic unit 23, and a data output unit 24.

[0258] Discrete tension data is input from the tension measuring device 25 to the data input unit 21. In addition, various data related to the rope specifications and data related to the groove cutting amount are input to the data input unit 21.

[0259] The storage unit 22 stores the data input to the data input unit 21. In addition, the storage unit 22 stores the calculation result of the arithmetic unit 23.

[0260] The arithmetic unit 23 calculates continuous tension data based on the discrete tension data, various data related to the rope specifications, and data related to the groove cutting amount. The data output unit 24 outputs the continuous tension data calculated by the arithmetic unit 23 to the outside.

[0261] Figure 15 is a flowchart showing Figure 14 the operation of the operation unit. In step S1001, the discrete tension data, various data related to the rope specifications, and data related to the groove cutting amount are set to initial values. After the time t is set to zero, in step S1002, the commanded angular velocity given to the pulley 10 to move the car 12 is calculated.

[0262] Next, in step S1003, the commanded torque is calculated so that the pulley 10 follows the commanded angular velocity and is given as input data to the tension model. In steps S1004 and S1005, the equations of motion are integrated over time, thereby calculating the winding-side tension data Ti(t + Δt) and the payout-side tension data To(t + Δt) at the next time step t + Δt.

[0263] Then, in step S1006, the time t is set to t + Δt again, and thus the states at the next time step are calculated sequentially. By repeating the above steps, the tension at all car positions can be obtained as continuous tension data.

[0264] Figure 16 is a flowchart showing Figure 15 the operation of the processing part of the tension model. Using the angular velocity (d / dt)θs(t) of the pulley 10 and the angular velocity (d / dt)θr(t) of the rope on the pulley at time t, the rope angle θr on the pulley 10, in step S101, a small winding amount Δx is obtained according to equation (1.25) or (1.34).

[0265] Then, in step S102, the operation unit 23 determines whether the winding amount Δx is greater than 0. That is, the operation unit 23 determines the traveling direction of the car 12. Here, when Δx is positive, the car descends, and when Δx is negative, the car ascends.

[0266] If Δx is greater than 0, the car 12 descends, and in step S103, the operation unit 23 sets the counterweight-side tension Tw as the winding-side tension Ti as shown in equation (1.31). If Δx is not greater than 0, the car 12 ascends, and in step S104, the operation unit 23 sets the car-side tension Tc as the winding-side tension Ti as shown in equation (1.39).

[0267] Then, in step S105, the arithmetic unit 23 calculates the free length ΔL of the rope according to equation (1.43). Next, in step S106, the arithmetic unit 23 calculates the rope length Lc on the car side and the rope length Lw on the counterweight side as values at time t+Δt based on the free length ΔL of the rope, using equation (1.42). In addition, the winding amount x of the rope 11 on the pulley 10 and the free length L of the rope on the pulley 10 corresponding to the winding amount x are calculated as values at time t+Δt according to equation (1.29).

[0268] Then, in step S107, the arithmetic unit 23 obtains the rope rigidity ki of the winding side portion at time t+Δt according to equation (1.31) or (1.39) based on the length Li of the winding side portion and the length Lo of the feeding side portion using equation (1.28) or (1.37), and obtains the rope rigidity ko of the feeding side portion according to equation (1.32) or (1.40). Furthermore, the tension Ti of the winding side portion at time t+Δt is obtained according to equation (1.31) or (1.39), and the tension To of the feeding side portion is calculated according to equation (1.32) or (1.40).

[0269] Then, in step S108, the arithmetic unit 23 determines whether the tension ratio To / Ti satisfies equation (1.22). Then, when equation (1.22) is satisfied, in step S109, the arithmetic unit 23 determines that no slip has occurred between the pulley 10 and the rope 11, and executes the process of equation (1.23).

[0270] On the other hand, when equation (1.22) is not satisfied, in step S110, the arithmetic unit 23 determines that slip has occurred between the pulley 10 and the rope 11, and executes the process of equation (1.24).

[0271] Through the above processing, while obtaining the angle θs of the pulley 10, the angular velocity (d / dt)θs, the angle θr of the rope 11 on the pulley 10, and the angular velocity (d / dt)θr at the next time step t+Δt, the tension Ti on the winding side and the tension To on the feeding side can be obtained.

[0272] In such a state monitoring method, state monitoring program, recording medium, and state monitoring device, for each of the plurality of ropes 11, the winding side portion and the feeding side portion with respect to the pulley 10 are respectively modeled as springs. Then, the tensions of the plurality of ropes are calculated using a tension model composed of a plurality of equations of motion. In addition, the tension model takes discrete tension data as input data and continuous tension data as output data.

[0273] Therefore, the tension variation for each car position of all the ropes 11 can be easily calculated through processing with low computational load and simplicity.

[0274] In addition, in the tension model, the displacement amount given to the pulley-side end portion, i.e., the upper end, in each winding-side portion is set as the rope free length ΔL. Therefore, more accurate tension can be estimated through simple processing.

[0275] In addition, the maximum value of the tension and the amount of change in the tension caused by the change in the car position can be grasped more accurately. Thereby, it is monitored whether these values converge within the allowable range, and in the case of exceeding the allowable range, maintenance inspection is carried out. Thereby, the tension of each rope 11 can be appropriately managed.

[0276] In addition, the tension model uses the measured values of the depths of the respective grooves provided in the pulley 10 as input data. Therefore, more accurate tension can be estimated.

[0277] In addition, the rope elongation amount Δu is a value proportional to the rope free length ΔL and the tension Ti in the winding-side portion. Therefore, the rope elongation amount Δu can be calculated more accurately, and thereby, accurate tension can be estimated.

[0278] In addition, the rope free length ΔL is a function of the winding amount Δx and the tension Ti in the winding-side portion. Therefore, the rope elongation amount Δu with respect to the winding amount Δx can be calculated more accurately, and thereby, the tension Ti in the winding-side portion can be calculated more accurately.

[0279] In addition, the lengths of the winding-side portion and the feeding-side portion are calculated based on the rope free length ΔL, respectively. Thereby, the rope free length ΔL of the rope wound around the winding-side portion becomes shorter, and the feeding-side portion becomes longer. Therefore, more accurate tension can be estimated.

[0280] That is, in the tension model, the displacement amount given to the pulley-side end portions in the winding-side portion and the feeding-side portion is set as the value obtained by subtracting the rope elongation amount in the winding amount from the winding amount based on the pulley, i.e., the rope free length ΔL. Thereby, more accurate tension can be estimated.

[0281] In addition, the tension Ti in the winding-side portion is calculated based on the displacement difference between the upper end and the lower end of the winding-side portion, and the tension To in the feeding-side portion is calculated based on the displacement difference between the upper end and the lower end of the feeding-side portion. Therefore, more accurate tension can be estimated.

[0282] In addition, the rope rigidity ki in the winding-side portion is a function of the Young's modulus E, the cross-sectional area A, and the length Li of the winding-side portion. In addition, the rope rigidity ko in the feeding-side portion is a function of the Young's modulus E, the cross-sectional area A, and the length Lo of the feeding-side portion. Therefore, the rope rigidity ki in the winding-side portion and the rope rigidity ko in the feeding-side portion can be calculated more accurately.

[0283] Embodiment 2

[0284] Next, Figure 17 is an explanatory diagram showing the relationship between the tension model and the input / output data in Embodiment 2. Among various data related to the rope specifications, there are Young's modulus E, cross-sectional area A, rope diameter d, linear density ρ, number of ropes N, shackle rigidity ks, etc. However, the Young's modulus E and the cross-sectional area A among them change over the years. When the Young's modulus E and the cross-sectional area A change, a deviation occurs between the continuous tension data and the discrete tension data.

[0285] In contrast, in Embodiment 2, the values of the Young's modulus E and the cross-sectional area A, which are parameter values in each rope 11, are respectively converged and identified through iterative calculations so that the continuous tension data and the discrete tension data are consistent. In addition, the basic structure of the state monitoring device in Embodiment 2 is the same as Figure 14 the same.

[0286] Figure 18 is a flowchart showing a part of the operation of the state monitoring device in Embodiment 2. The state monitoring device periodically executes Figure 18 the update process of the parameter values shown to make the continuous tension data and the discrete tension data consistent on the basis of the same operation as in Embodiment 1. In general, the operation of the update process of the parameter values is called parameter estimation or parameter identification.

[0287] In step S201, the monitoring device main body 20 calculates the difference in tension, that is, the tension difference, between the continuous tension data and the discrete tension data at the same car position for each rope 11.

[0288] Next, in step S202, the monitoring device main body 20 determines whether the absolute value of the tension difference is smaller than the difference threshold ε. The difference threshold ε is a small value preset in the monitoring device main body 20. If the tension difference is smaller than the difference threshold ε, the monitoring device main body 20 ends the current process.

[0289] When the tension difference is equal to or greater than the difference threshold ε, in step S203, the monitoring device main body 20 corrects the parameter values. The parameter values are the values of the Young's modulus E and the cross-sectional area A.

[0290] At this time, the monitoring device main body 20 uses a data table that stores the results calculated using multiple different parameter values for the tension model. The monitoring device main body 20 estimates the parameter values with the smallest tension difference through interpolation according to the data table.

[0291] Then, in step S204, the monitoring device main body 20 calculates new continuous tension data using the corrected parameters. Then, in step S205, the monitoring device main body 20 updates the continuous tension data and returns to the process of step S201. The above process is repeated until the absolute value of the tension difference is smaller than the differential threshold ε. Thus, the parameter values after aging changes can be identified and the parameter values can be updated.

[0292] The state monitoring method of Embodiment 2 includes a parameter value update step and a tension calculation step that is the same as that of Embodiment 1. The parameter value update step is as follows: when the difference between the continuous tension data and the discrete tension data is equal to or greater than the differential threshold ε, at least one of the value of Young's modulus E and the value of cross-sectional area A is updated so that the continuous tension data and the discrete tension data are consistent.

[0293] The state monitoring program of Embodiment 2 is a program that causes a computer to execute the above state monitoring method.

[0294] In addition, the recording medium of Embodiment 2 is a computer-readable recording medium that records the elevator state monitoring program that causes a computer to execute the above state monitoring method. The state monitoring program is stored in a storage medium (such as Figure 33 the memory 202) in a readable form. Moreover, the processing described in the state monitoring program read from the storage medium is executed by the computer.

[0295] In such a state monitoring method, state monitoring program, recording medium, and state monitoring device, the values of Young's modulus E and cross-sectional area A are updated corresponding to the aging changes of each rope 11. Since Young's modulus E and cross-sectional area A affect the rope rigidity, the tension of each rope 11 can be estimated more accurately.

[0296] In addition, the identified cross-sectional area A of each rope 11 can be used as an index for determining the deterioration state of each rope 11. For example, when the identified cross-sectional area A is lower than the allowable value, maintenance inspection is performed and the rope is replaced according to the state of the rope 11.

[0297] In addition, as the value of aging change among various data related to the specifications of the rope 11, in addition to Young's modulus E and cross-sectional area A, the rope diameter d is also cited. When the rope diameter d changes, similar to the case where the groove depth in the pulley 10 changes, the winding amount of the rope 11 on the pulley 10 changes, affecting the tension. Thus, the rope diameter d can also be made to converge and identified by repeated calculations so that the continuous tension data and the discrete tension data are consistent.

[0298] In addition, the groove cutting amount does not change according to the car position. In contrast, the number of bends varies for each rope section. Therefore, the rope diameter d becomes a value that differs according to the car position. By comparing the difference between the continuous tension data and the discrete tension data for each car position, it is also possible to calculate the difference in the rope diameter d caused by the car position.

[0299] Embodiment 3

[0300] Next, Figure 19 is an explanatory diagram showing the relationship between the tension model and the input / output data in Embodiment 3. The groove cutting amount among the parameters input to the tension model changes over the years. When the groove cutting amount changes, a deviation occurs between the continuous tension data and the discrete tension data.

[0301] In contrast, in Embodiment 3, the values of the groove cutting amount in each groove are converged and identified by repeated calculations so that the continuous tension data and the discrete tension data match. In addition, the basic structure of the state monitoring device of Embodiment 3 is the same as Figure 14 the same.

[0302] The state monitoring method of Embodiment 3 includes a parameter value update step and a tension calculation step that is the same as in Embodiment 1. The parameter value update step is a step in which, when the difference between the continuous tension data and the discrete tension data is equal to or greater than the difference threshold ε, the groove cutting amount in each groove is updated so that the continuous tension data and the discrete tension data match.

[0303] The specific content of the parameter value update step is to replace Figure 18 the Young's modulus E and the cross-sectional area A in the description of

[0304] The state monitoring program of Embodiment 3 is a program that causes a computer to execute the above-described state monitoring method.

[0305] In addition, the recording medium of Embodiment 3 is a computer-readable recording medium that records the elevator state monitoring program that causes a computer to execute the above-described state monitoring method. The state monitoring program is stored in a storage medium (such as Figure 33 the memory 202) in a readable form. Moreover, the processing described in the state monitoring program read from the storage medium is executed by a computer.

[0306] In such a state monitoring method, state monitoring program, recording medium, and state monitoring device, the values of the groove cutting amount in each groove are updated corresponding to the aging change of the pulley 10. Thereby, it is possible to estimate the tension of each rope 11 more accurately.

[0307] In addition, when a difference greater than the allowable amount occurs between the groove cutting amounts in multiple grooves, a groove grinding operation for equalizing the depths of the multiple grooves can be performed at an appropriate timing.

[0308] In addition, each identified groove cutting amount can be used as an index for determining the deterioration state of the pulley 10. For example, when the groove cutting amount in at least any one groove exceeds the allowable value, an instruction to request replacement of the pulley 10 can be reported.

[0309] In addition, the initial value of each groove cutting amount may not be a measured value, but a value identified based on the discrete tension data. Thereby, the operation of measuring the groove depth can be omitted.

[0310] In addition, both the parameter value update step in Embodiment 2 and the parameter value update step in Embodiment 3 can be executed.

[0311] Embodiment 4

[0312] Next, Embodiment 4 will be described. The basic structure of the state monitoring device in Embodiment 4 is the same as Figure 14 However, in Embodiment 4, the state monitoring device is a server. That is, the state monitoring device is placed at a location far from the elevator that is the object of the maintenance work.

[0313] The discrete tension data and the data related to the groove cutting amount are sent from the maintenance work site to the state monitoring device via the communication network line. The transmission and reception of data between the maintenance work site and the state monitoring device are performed by the communication device carried by the maintenance worker or the control panel of the elevator.

[0314] In Embodiment 4, various data related to the rope specifications are embedded in the tension model as fixed values. That is, various data related to the rope specifications are pre-stored in the monitoring device main body 20 by the storage unit 22.

[0315] Figure 20 is a flowchart showing a part of the operation of the state monitoring device in Embodiment 4. The monitoring device main body 20 executes the Figure 20 shown adjustment amount sending process during the maintenance inspection of the elevator.

[0316] In step S301, the monitoring device main body 20 acquires the discrete tension data and the data related to the groove cutting amount via the communication network line. The discrete tension data and the data related to the groove cutting amount are sent from the maintenance work site to the monitoring device main body 20 via the communication network line.

[0317] In step S302, the monitoring device main body 20 calculates continuous tension data. Then, in step S303, the monitoring device main body 20 determines whether the maximum tension, which is the maximum value of the tension included in the continuous tension data, exceeds the maximum allowable value. The maximum allowable value is preset in the monitoring device main body 20 as the tension allowable value.

[0318] When the maximum tension exceeds the maximum allowable value, in step S304, the monitoring device main body 20 calculates the adjustment amount of the tension so that the maximum tension becomes below the maximum allowable value. Then, the monitoring device main body 20 sends the adjustment amount to the maintenance work site via the communication network line.

[0319] The maintenance worker adjusts the tension of each rope 11 according to the received adjustment amount and sends the adjusted discrete tension data to the monitoring device main body 20.

[0320] If the maximum tension becomes below the maximum allowable value in step S303, the monitoring device main body 20 ends the adjustment amount sending process.

[0321] The state monitoring method of Embodiment 4 includes an adjustment amount sending step and a tension calculation step that is the same as that of Embodiment 1. The adjustment amount sending step is the following step: determining whether the tension of each rope 11 deviates from the tension allowable value based on the continuous tension data, and sending the calculated adjustment amount of the tension when it deviates from the tension allowable value.

[0322] The state monitoring program of Embodiment 4 is a program that causes a computer to execute the above state monitoring method.

[0323] In addition, the recording medium of Embodiment 4 is a computer-readable recording medium that records the elevator state monitoring program for causing a computer to execute the above state monitoring method. The state monitoring program is stored in a storage medium (such as Figure 33 the memory 202) in a readable form. Moreover, the processing described in the state monitoring program read from the storage medium is executed by the computer.

[0324] In such a state monitoring method, state monitoring program, recording medium, and state monitoring device, when the maximum tension exceeds the allowable value, the adjustment amount of the tension is sent to the maintenance work site. Therefore, the tension adjustment operation can be easily performed, and the shortening of the maintenance work time can be achieved. In addition, by making the tension of each rope 11 an appropriate size, the shortening of the life of each rope 11 can be suppressed.

[0325] In addition, the re-acquisition of the discrete tension data after the tension adjustment may be omitted.

[0326] In addition, the elevator that is the object of maintenance work can also measure the tension of each rope 11 at a preset cycle and send it as discrete tension data to the status monitoring device. In addition, a groove depth measuring device that measures the depth of each groove in the measuring pulley 10 can be provided near the pulley 10.

[0327] Moreover, the elevator can also measure the depth of each groove at a preset cycle and send it as data related to the groove cutting amount to the status monitoring device.

[0328] In this case, the monitoring device main body 20 can also execute the adjustment amount sending process at the timing of receiving the discrete tension data and the data related to the groove cutting amount. The maintenance worker can adjust the tension of each rope 11 according to the adjustment amount sent by the latest adjustment amount sending process during the maintenance work.

[0329] Figure 21 It is a flowchart showing a part of the operation of the status monitoring device according to the first modification of Embodiment 4. In the adjustment amount sending process of the first modification, a preset minute adjustment amount is sent to the elevator one or more times.

[0330] When the maximum tension exceeds the maximum allowable value in step S303, in step S305, the monitoring device main body 20 in the first modification sends -ΔT as the adjustment amount of the tension to the maintenance work site.

[0331] In addition, when the maximum tension is below the maximum allowable value, in step S306, the monitoring device main body 20 determines whether the minimum tension, which is the minimum value of the tensions included in the continuous tension data, is less than the minimum allowable value. The minimum allowable value is preset as the tension allowable value in the monitoring device main body 20.

[0332] When the minimum tension is less than the minimum allowable value, in step S307, the monitoring device main body 20 sends +ΔT as the adjustment amount of the tension to the maintenance work site. The value of ΔT is preset in the monitoring device main body 20.

[0333] After sending the adjustment amount of the tension in step S305 or step S307, in step S308, the monitoring device main body 20 sends a car running instruction to the maintenance work site.

[0334] After the maintenance worker adjusts the tension of each rope 11 according to the received adjustment amount, the car 12 runs back and forth once, and sends the adjusted discrete tension data to the monitoring device main body 20.

[0335] Such adjustment of the tension is repeated until the maximum tension becomes below the maximum allowable value and the minimum tension becomes above the minimum allowable value.

[0336] The adjustment amount transmission step in the first modification example is as follows: Based on the continuous tension data, it is determined whether the tension of each rope 11 deviates from the allowable tension value. If it deviates from the allowable tension value, the adjustment amount of the preset tension is transmitted.

[0337] Figure 22 It is a flowchart showing a part of the operation of the state monitoring device according to the second modification example of Embodiment 4. The state monitoring device in the second modification example is not a server but a portable computer carried by a maintenance operator.

[0338] Therefore, the calculated adjustment amount is displayed on the state monitoring device itself. In addition, data related to the groove cutting amount and discrete tension data are directly input to the state monitoring device.

[0339] According to the state monitoring device of the second modification example, for elevators that are not connected to the network, the same processing as that of the server is also performed, so that the tension can be easily adjusted.

[0340] Embodiment 5

[0341] Next, Embodiment 5 will be described. The basic structure of the state monitoring device of Embodiment 5 is the same as Figure 14 the same. In addition, the state monitoring device of Embodiment 5 is a server.

[0342] The elevator to be the maintenance object measures the tension of each rope 11 at a preset cycle and transmits it as discrete tension data. The state monitoring device receives the discrete tension data via the communication network line.

[0343] Figure 23 It is a flowchart showing a part of the operation of the state monitoring device of Embodiment 5. In step S401, the monitoring device main body 20 obtains discrete tension data via the communication network line. Data related to the rope specifications and data related to the groove cutting amount are pre-stored in the monitoring device main body 20.

[0344] In step S402, the monitoring device main body 20 calculates the continuous tension data. Then, in step S403, the monitoring device main body 20 determines whether the maximum tension, which is the maximum value of the tension included in the continuous tension data, exceeds the maximum allowable value. The maximum allowable value is preset in the monitoring device main body 20.

[0345] When the maximum tension exceeds the maximum allowable value, in step S404, the monitoring device main body 20 reports a maintenance instruction, that is, reports to the management room that a maintenance operation is required. If the maximum tension does not exceed the maximum allowable value, the monitoring device main body 20 waits to receive the next discrete tension data.

[0346] The state monitoring method of Embodiment 5 includes a maintenance instruction reporting step and a tension calculation step identical to that of Embodiment 1. The maintenance instruction reporting step is as follows: Determine whether the tension of each rope 11 deviates from the allowable tension value based on the continuous tension data, and if it deviates from the allowable tension value, report that a maintenance operation is required.

[0347] The state monitoring program of Embodiment 5 is a program that causes a computer to execute the above-described state monitoring method.

[0348] In addition, the recording medium of Embodiment 5 is a computer-readable recording medium that records an elevator state monitoring program for causing a computer to execute the above-described state monitoring method. The state monitoring program is stored in a storage medium (such as Figure 33 the memory 202) in a readable form. Moreover, the processing described in the state monitoring program read from the storage medium is executed by the computer.

[0349] In such a state monitoring method, state monitoring program, recording medium, and state monitoring device, a maintenance instruction is reported when the maximum tension exceeds the allowable tension value. Therefore, it is possible to adjust the tension of each rope 11 at a more appropriate timing, and it is possible to suppress the shortening of the life of each rope 11.

[0350] In addition, it is possible to suppress the excessive implementation of maintenance operations and to achieve the appropriate allocation of maintenance workers.

[0351] In addition, it is possible to make the maintenance operation target more clear and to shorten the maintenance operation time.

[0352] In addition, the timing of the maintenance operation is made appropriate, whereby it is possible to suppress vibrations, abnormal noises, etc. caused by the deterioration of the performance of the elevator.

[0353] In addition, the allowable tension value in Embodiment 5 may be the minimum allowable value, or may be both the maximum allowable value and the minimum allowable value.

[0354] Embodiment 6

[0355] Next, Embodiment 6 will be described. The basic structure of the state monitoring device of Embodiment 6 is the same as Figure 14 that. In addition, the state monitoring device of Embodiment 6 is a server.

[0356] The elevator to be the maintenance operation target measures the tension of each rope 11 at a preset cycle and transmits it as discrete tension data. The state monitoring device receives the discrete tension data via a communication network line.

[0357] Figure 24It is a flowchart showing a part of the operation of the state monitoring device according to Embodiment 6. In step S501, the monitoring device main body 20 acquires discrete tension data via a communication network line. Data related to the rope specifications and data related to the groove cutting amount are pre-stored in the monitoring device main body 20.

[0358] Then, the monitoring device main body 20 calculates continuous tension data, but this is omitted in Figure 24 In addition, in step S502, the monitoring device main body 20 extracts aging change data. The aging change data is the current value of the parameter that changes over time among the multiple parameters input to the tension model.

[0359] As parameters that change over time, the Young's modulus E of the rope 11, the cross-sectional area A of the rope 11, the groove cutting amount, etc. are cited. The current values of these parameters can be identified by the methods shown in Embodiment 2 and Embodiment 3.

[0360] Next, in step S503, the monitoring device main body 20 determines whether there is an abnormality in the aging change data. In the monitoring device main body 20, an aging change allowable value is set for each parameter that changes over time. The monitoring device main body 20 compares each parameter that changes over time with the corresponding aging change allowable value.

[0361] When there is an abnormality in the aging change data, that is, when there is a parameter exceeding the aging change allowable value, in step S504, the monitoring device main body 20 reports a maintenance instruction. If there is no abnormality in the aging change data, the monitoring device main body 20 waits to receive the next discrete tension data.

[0362] The state monitoring method according to Embodiment 6 includes an aging change monitoring step and a tension calculation step that is the same as that in Embodiment 1. The aging change monitoring step is a step of determining whether a parameter that changes over time among multiple parameters deviates from the aging change allowable value, and when deviating from the aging change allowable value, reporting that a maintenance operation is required.

[0363] The state monitoring program according to Embodiment 6 is a program that causes a computer to execute the above-mentioned state monitoring method.

[0364] In addition, the recording medium according to Embodiment 6 is a computer-readable recording medium that records the elevator state monitoring program that causes a computer to execute the above-mentioned state monitoring method. The state monitoring program is stored in a storage medium (such as Figure 33 the memory 202) in a readable form. Moreover, the processing described in the state monitoring program read from the storage medium is executed by a computer.

[0365] In such a state monitoring method, state monitoring program, recording medium, and state monitoring device, deterioration of at least any one of the rope 11 and the pulley 10 can be detected at an early stage, and maintenance work can be carried out at a more appropriate timing.

[0366] Embodiment 7

[0367] Next, Embodiment 7 will be described. The basic structure of the state monitoring device according to Embodiment 7 is the same as that of Figure 14 the same. In addition, the state monitoring device according to Embodiment 7 is a server.

[0368] Discrete tension data and data related to the groove cutting amount are sent from the maintenance work site to the state monitoring device via a communication network line. The transmission and reception of data between the maintenance work site and the state monitoring device are performed by a communication device carried by the maintenance worker or the control panel of the elevator.

[0369] In Embodiment 7, various data related to the rope specifications are embedded in the tension model as fixed values. That is, various data related to the rope specifications are pre-stored in the monitoring device main body 20 by the storage unit 22.

[0370] Figure 25 is a flowchart showing a part of the operation of the state monitoring device according to Embodiment 7. The monitoring device main body 20 executes the Figure 25 adjustment amount transmission process shown.

[0371] In step S601, the monitoring device main body 20 acquires discrete tension data and data related to the groove cutting amount via a communication network line. The discrete tension data and the data related to the groove cutting amount are sent from the maintenance work site to the monitoring device main body 20 via a communication network line.

[0372] Then, the monitoring device main body 20 calculates continuous tension data, but it is omitted in Figure 25 . In addition, in step S602, the monitoring device main body 20 calculates the difference between the maximum value and the minimum value of the depth of the groove in the pulley 10, that is, the maximum difference.

[0373] Next, in step S603, the monitoring device main body 20 determines whether the maximum difference exceeds the maximum difference allowable value. The maximum difference allowable value is preset in the monitoring device main body 20.

[0374] When the maximum difference exceeds the maximum difference allowable value, in step S604, the monitoring device main body 20 calculates the adjustment amount of the tension of each rope 11. Then, the monitoring device main body 20 sends the adjustment amount of the tension via a communication network line.

[0375] The monitoring device main body 20 calculates the adjustment amount of the tension of each rope 11 so that the depths of the multiple grooves approach equal values.

[0376] Specifically, the monitoring device main body 20 calculates an adjustment amount to reduce the tension of the rope 11 corresponding to the groove with a large groove cutting amount and increase the tension of the rope 11 corresponding to the groove with a small groove cutting amount. By increasing the tension of the rope 11, after the tension adjustment, the groove cutting amount of the corresponding groove becomes larger. By reducing the tension of the rope 11, after the tension adjustment, the groove cutting amount of the corresponding groove becomes smaller.

[0377] The maintenance operator adjusts the tension of each rope 11 according to the received adjustment amount.

[0378] In step S603, if the maximum difference becomes equal to or less than the maximum difference allowable value, the monitoring device main body 20 ends the adjustment amount transmission process.

[0379] The state monitoring method of Embodiment 7 includes an adjustment amount transmission step and a tension calculation step that is the same as that of Embodiment 1. The adjustment amount transmission step is the following step: determining whether the maximum difference in the depths of a plurality of grooves deviates from the maximum difference allowable value, and if it deviates from the maximum difference allowable value, transmitting the calculated adjustment amount of the tension.

[0380] The state monitoring program of Embodiment 7 is a program that causes a computer to execute the above-described state monitoring method.

[0381] In addition, the recording medium of Embodiment 7 is a computer-readable recording medium that records an elevator state monitoring program for causing a computer to execute the above-described state monitoring method. The state monitoring program is stored in a storage medium (such as Figure 33 the memory 202) in a readable form. Moreover, the processing described in the state monitoring program read from the storage medium is executed by a computer.

[0382] In such a state monitoring method, state monitoring program, recording medium, and state monitoring device, when the maximum difference exceeds the maximum difference allowable value, the adjustment amount of the tension is transmitted to the maintenance work site. Therefore, the tension adjustment work can be easily performed, and the shortening of the maintenance work time can be achieved.

[0383] In addition, the depths of a plurality of grooves can be gradually made closer to an equal value, and the long life of the pulley 10 can be achieved. In addition, by extending the life of the pulley 10, the labor and time for pulley replacement and groove machining work can be reduced.

[0384] In addition, the tension difference of the plurality of ropes 11 due to the difference in the depths of the grooves can be suppressed, and the long life of each rope 11 can also be achieved.

[0385] Figure 26 is a flowchart showing a part of the operation of the state monitoring device according to a modification of Embodiment 7.

[0386] In step S701, the monitoring device main body 20 of the modification example acquires discrete tension data and data related to the groove cutting amount.

[0387] Then, the monitoring device main body 20 calculates continuous tension data, but it is omitted in Figure 26 In addition, in step S702, the monitoring device main body 20 calculates the average value of the depths of a plurality of grooves, and selects the rope number i of the rope 11 corresponding to the deepest groove and the rope number j of the rope 11 corresponding to the shallowest groove.

[0388] Next, in step S703, the monitoring device main body 20 determines whether tension adjustment is required using the depth difference allowable value. The depth difference allowable value is preset in the monitoring device main body 20.

[0389] Specifically, in step S703, the monitoring device main body 20 determines whether the difference between the depth of the deepest groove and the average value exceeds the depth difference allowable value. Then, when the depth difference allowable value is exceeded, in step S704, the monitoring device main body 20 temporarily sets -ΔT as the adjustment amount of the tension of the rope 11 for the rope number i.

[0390] In addition, in step S703, the monitoring device main body 20 determines whether the difference between the depth of the shallowest groove and the average value exceeds the depth difference allowable value. Then, when the depth difference allowable value is exceeded, in step S704, the monitoring device main body 20 temporarily sets +ΔT as the adjustment amount of the tension of the rope 11 for the rope number j.

[0391] If neither the difference between the depth of the deepest groove and the average value nor the difference between the depth of the shallowest groove and the average value exceeds the depth difference allowable value, the monitoring device main body 20 determines that tension adjustment is not required, and ends the current process.

[0392] When the tension adjustment amount ΔT is given, the overall rope tension behavior changes, and the adjusted maximum tension may exceed the maximum allowable value. Therefore, in step S705, the monitoring device main body 20 calculates continuous tension data based on the temporarily set adjustment amount. Then, the monitoring device main body 20 determines whether the maximum tension is below the maximum allowable value.

[0393] When the maximum tension exceeds the maximum allowable value, in step S707, the monitoring device main body 20 reduces the adjustment amount. For example, when the temporarily set adjustment amount is +ΔT, the temporarily set value of the adjustment amount is corrected to +ΔT - t. In addition, when the temporarily set adjustment amount is -ΔT, the temporarily set value of the adjustment amount is corrected to -ΔT + t. The reduction amount t is a value smaller than ΔT.

[0394] The monitoring device main body 20 repeats the processes of step S705 to step S707 until the maximum tension becomes equal to or less than the maximum allowable value.

[0395] If the maximum tension is equal to or less than the maximum allowable value, then in step S708, the monitoring device main body 20 officially sets the adjustment amount, and transmits the tension adjustment information associating the rope number and the adjustment amount to the elevator via the communication network line.

[0396] The maintenance operator adjusts the tension of each rope 11 according to the received adjustment amount. By reducing the tension, the surface pressure acting on the groove decreases, so that the cutting speed of the groove can be reduced. In addition, by increasing the tension, the surface pressure acting on the groove increases, so that the cutting speed of the groove can be increased.

[0397] The state monitoring method of the modification of Embodiment 7 includes an adjustment amount transmission step and a tension calculation step the same as that of Embodiment 1. In the adjustment amount transmission step, it is determined whether at least any one of the difference between the depth of the deepest groove and the average value and the difference between the depth of the shallowest groove and the average value exceeds the depth difference allowable value. Then, in the case where the depth difference allowable value is exceeded, the tension adjustment information is transmitted.

[0398] The state monitoring program of the modification of Embodiment 7 is a program that causes a computer to execute the above state monitoring method.

[0399] In addition, the recording medium of the modification of Embodiment 7 is a computer-readable recording medium that records the elevator state monitoring program that causes a computer to execute the above state monitoring method. The state monitoring program is stored in a storage medium (such as Figure 33 the memory 202) in a readable form. Moreover, the processes described in the state monitoring program read from the storage medium are executed by the computer.

[0400] In such a state monitoring method, state monitoring program, recording medium, and state monitoring device, the tension adjustment operation can also be easily performed, and the shortening of the maintenance operation time can be achieved.

[0401] In addition, continuous tension data is calculated based on the temporarily set adjustment amount, and the adjustment amount is corrected so that the maximum tension becomes equal to or less than the maximum allowable value. Therefore, the uniformization of the groove cutting amount can be achieved within an appropriate range of tension variation.

[0402] In addition, Figure 22 Similar to the second modification of Embodiment 4 shown in

[0403] In addition, in the adjustment amount transmission step in Embodiments 4 and 7, before transmitting the adjustment amount, it is also possible to determine whether adjustment with the adjustment amount can be achieved in terms of the thread amount of the tension adjustment screw, the rope safety factor, etc. Then, in the case where it is determined that adjustment cannot be achieved, it is also possible to notify the meaning that adjustment cannot be made. By notifying the meaning that adjustment cannot be made, maintenance operators can machine each groove or replace the pulley 10.

[0404] Embodiment 8

[0405] Next, Embodiment 8 will be described. The basic structure of the state monitoring device of Embodiment 8 is the same as Figure 14 the same.

[0406] Figure 27 is a flowchart showing the maintenance period calculation process of the state monitoring device of Embodiment 8.

[0407] In the maintenance period calculation process, an estimated value is calculated according to the time-varying function, and the maintenance period is calculated based on the continuous tension data calculated using the estimated value. The maintenance period is the period when maintenance work needs to be carried out.

[0408] The time-varying function is a function representing the time variation of the estimated object parameter caused by the travel of the car 12. The estimated object parameter is at least any one of a plurality of parameters. The time-varying function is obtained, for example, based on the test evaluation results and is stored in advance in the monitoring device main body 20. The estimated value is the future value of the estimated object parameter.

[0409] The estimated object parameter of Embodiment 8 is the groove cutting amount. The time-varying function of Embodiment 8 is the groove wear function. The groove wear function is a function representing the relationship between the travel distance of the car 12 and the groove cutting amount in each groove. The estimated value is the future value of the groove cutting amount.

[0410] In step S801, the monitoring device main body 20 acquires discrete tension data and data related to the groove cutting amount. In Embodiment 8, various data related to the rope specifications are embedded in the tension model as fixed values.

[0411] Next, in step S802, the monitoring device main body 20 calculates a plurality of estimated values corresponding to different travel distances. Then, in step S803, the monitoring device main body 20 calculates a plurality of continuous tension data corresponding to the plurality of estimated values respectively.

[0412] Then, in step S804, the monitoring device main body 20 calculates the maintenance period. Specifically, the monitoring device main body 20 obtains the maximum tension from each continuous tension data, and selects the traveling distance where the maximum tension exceeds the maximum allowable value. Then, the distance obtained by subtracting the set distance from the selected traveling distance or the distance obtained by multiplying the selected traveling distance by the safety factor is set as the maintenance period. The safety factor is a positive value less than 1.

[0413] Figure 28 is a flowchart showing the maintenance period monitoring process of the state monitoring device according to Embodiment 8.

[0414] The maintenance period monitoring process is a process of monitoring whether the maintenance period has been reached based on the cumulative traveling distance of the car 12.

[0415] The cumulative traveling distance of the car 12 can be calculated based on the number of car starts and the number of working days of the elevator. The number of car starts is the number of times the elevator serves passengers within one day, for example, the number envisaged in advance when the elevator is delivered, or the average number of starts during a certain period based on actual working data, etc. In addition, by receiving information related to the actual traveling distance from the elevator control panel, the cumulative traveling distance of the car 12 can also be obtained.

[0416] In step S805, the monitoring device main body 20 obtains the data required for calculating the continuous tension data and the data related to the cumulative traveling distance of the car 12. Then, in step S806, the monitoring device main body 20 calculates the continuous tension data.

[0417] Next, in step S807, the monitoring device main body 20 determines whether the maintenance period calculated by the maintenance period calculation process has been reached.

[0418] If the maintenance period has not been reached, in step S808, the monitoring device main body 20 corrects the data of the parameters that can be corrected. As a result, the accuracy of the continuous tension data in the future cumulative traveling distance is improved.

[0419] If the maintenance period has been reached, in step S809, the monitoring device main body 20 reports to the management room that the maintenance period has been reached.

[0420] The state monitoring method of Embodiment 8 includes a maintenance period calculation step, a maintenance period monitoring step, and a tension calculation step that is the same as that of Embodiment 1. The maintenance period calculation step is as follows: calculating an estimated value of the future groove cutting amount according to the groove wear function, and calculating the maintenance period according to the continuous tension data calculated using the estimated value. The maintenance period monitoring step is as follows: monitoring whether the maintenance period has been reached based on the cumulative traveling distance of the car 12.

[0421] The status monitoring program of Embodiment 8 is a program that causes a computer to execute the above-described status monitoring method.

[0422] In addition, the recording medium of Embodiment 8 is a computer-readable recording medium that records the status monitoring program of an elevator that causes a computer to execute the above-described status monitoring method. The status monitoring program is stored in a storage medium (such as Figure 33 the memory 202) in a readable form. Moreover, the processing described in the status monitoring program read from the storage medium is executed by the computer.

[0423] In such a status monitoring method, status monitoring program, recording medium, and status monitoring device, it is possible to estimate in advance the period when maintenance work is required. Therefore, it is possible to efficiently set a maintenance plan and appropriate the load on the maintenance staff.

[0424] In addition, by monitoring whether the maintenance period has been reached, it is possible to more reliably perform maintenance work and keep the elevator in a more appropriate state.

[0425] Next, a modified example of Embodiment 8 will be described. The basic structure of the status monitoring device of the modified example of Embodiment 8 is the same as Figure 14 the same.

[0426] Figure 29 is an explanatory diagram showing the relationship between the tension model and the input / output data in the modified example of Embodiment 8. Among various data related to the rope specifications, it includes Young's modulus E, cross-sectional area A, rope diameter d, linear density ρ, number of ropes N, shackle rigidity ks, etc. In the modified example of Embodiment 8, each groove cutting amount is calculated by substituting various data related to the rope specifications and discrete tension data into the tension model. The difference between the relationship between the tension model and the input / output data in the modified example of Embodiment 8 and the relationship between the tension model and the input / output data in Embodiment 8 lies in calculating the groove cutting amount.

[0427] Figure 30 is a flowchart showing the maintenance period monitoring process of the modified example of Embodiment 8. The maintenance period monitoring process is a process of calculating the groove cutting amount and continuous tension data corresponding to the traveling distance based on the accumulated traveling distance of the car 12 and monitoring whether the maintenance period has been reached.

[0428] In step S805a, the monitoring device main body 20 acquires the data required to calculate the continuous tension data and the data related to the accumulated traveling distance of the car 12. Then, in step S805b, the monitoring device main body 20 passes through Figure 29The processing is used to calculate the groove cutting amount corresponding to the cumulative travel distance of the car 12. Then, in step S806, the continuous tension data is calculated using the calculated groove cutting amount, the data required for calculating the continuous tension data obtained in step S805a, and the data related to the cumulative travel distance of the car 12.

[0429] Next, in step S807, the monitoring device main body 20 determines whether the maintenance period calculated through the maintenance period calculation process has been reached.

[0430] If the maintenance period has not been reached, in step S808, the monitoring device main body 20 corrects the data of the parameters that can be corrected. As a result, the accuracy of the continuous tension data at the future cumulative travel distance is improved.

[0431] If the maintenance period has been reached, in step S809, the monitoring device main body 20 reports to the management room that the maintenance period has been reached.

[0432] The state monitoring method of the modification of Embodiment 8 includes a maintenance period calculation step, a maintenance period monitoring step, and a tension calculation step the same as that of Embodiment 1. The maintenance period calculation step is as follows: an estimated value of the future groove cutting amount is calculated according to the groove wear function, and the maintenance period is calculated according to the continuous tension data calculated using the estimated value. The maintenance period monitoring step is as follows: it is monitored whether the maintenance period has been reached based on the cumulative travel distance of the car 12.

[0433] The state monitoring program of the modification of Embodiment 8 is a program that causes a computer to execute the above state monitoring method.

[0434] In addition, the recording medium of the modification of Embodiment 8 is a computer-readable recording medium that records the elevator state monitoring program that causes a computer to execute the above state monitoring method. The state monitoring program is stored in a storage medium (such as Figure 33 the memory 202) in a readable form. Moreover, the processing described in the state monitoring program read from the storage medium is executed by the computer.

[0435] According to the state monitoring method, state monitoring program, recording medium, and state monitoring device of the modification of Embodiment 8, the same effects as those of Embodiment 8 described above can be obtained.

[0436] In addition, according to the modification of Embodiment 8, the measurement operation of the groove cutting amount can be omitted, so the workload of the maintenance staff can be reduced.

[0437] Embodiment 9

[0438] Next, Embodiment 9 will be described. The basic structure of the state monitoring device of Embodiment 9 is the same as that ofFigure 14 Same

[0439] In addition, the state monitoring device of Embodiment 9 performs the same maintenance period calculation process as Figure 27 and the same maintenance period monitoring process as Figure 28 However, in Embodiment 9, the step S803 of Figure 27 is omitted.

[0440] The parameters to be estimated in Embodiment 9 are the Young's modulus E and the cross-sectional area A in each rope 11. The time-dependent change function in Embodiment 9 is a rope time-dependent function. The rope time-dependent function is a function representing the relationship between the travel distance of the car 12 and the Young's modulus E and the cross-sectional area A. The estimated values are the future values of the Young's modulus E and the future values of the cross-sectional area A in each rope 11.

[0441] In Figure 27 step S801 of, the monitoring device main body 20 acquires discrete tension data and various data related to the rope specifications.

[0442] Next, in step S802, the monitoring device main body 20 calculates a plurality of estimated values corresponding to different travel distances.

[0443] Then, in step S804, the monitoring device main body 20 calculates the maintenance period. Specifically, the monitoring device main body 20 selects the travel distance at which either the Young's modulus E or the cross-sectional area A deviates from the allowable value. Then, the distance obtained by subtracting the set distance from the selected travel distance or the distance obtained by multiplying the selected travel distance by the safety factor is set as the maintenance period.

[0444] The maintenance period monitoring process is the same as that in Embodiment 8.

[0445] The state monitoring method of Embodiment 9 includes a maintenance period calculation step, a maintenance period monitoring step, and a tension calculation step that is the same as that in Embodiment 1. The maintenance period calculation step is the following step: calculating estimated values of the future values of the Young's modulus E and the future values of the cross-sectional area A according to the rope time-dependent function, and calculating the maintenance period according to the estimated values. The maintenance period monitoring step is the following step: monitoring whether the maintenance period has been reached based on the cumulative travel distance of the car.

[0446] The state monitoring program of Embodiment 9 is a program that causes a computer to execute the above state monitoring method.

[0447] In addition, the recording medium of Embodiment 9 is a computer-readable recording medium that records the elevator state monitoring program for causing a computer to execute the above state monitoring method. The state monitoring program is stored in a storage medium (such as Figure 33of the memory 202). Moreover, the processes described in the status monitoring program read from the storage medium are executed by a computer.

[0448] In such a status monitoring method, status monitoring program, recording medium, and status monitoring device, it is possible to estimate in advance the timing when maintenance work needs to be carried out. Therefore, it is possible to efficiently set a maintenance plan and appropriate the load on the maintenance staff.

[0449] In addition, by monitoring whether the maintenance timing has been reached, it is possible to more reliably carry out maintenance work and keep the elevator in a more appropriate state.

[0450] In addition, in Embodiments 8 and 9, it is also possible to execute a function update process for updating the time-varying function. Specifically, in the function update process, a set distance is preset, and an estimated value when the set distance is reached is calculated in advance using the time-varying function. Then, when the cumulative travel distance of the car 12 reaches the set distance, the difference between the current measured value or estimated value of the parameter to be estimated and the estimated value calculated in advance is calculated. The time-varying function is updated to make this difference smaller.

[0451] In addition, the updated time-varying function can also be uploaded to the server. In the server, multiple groove wear functions collected from multiple elevators are stored for each elevator type, and the time-varying function is optimized based on this data. The optimized time-varying function is transferred from the server to each elevator, and in each elevator, the groove wear function is updated to the latest state.

[0452] In this way, by continuously updating the time-varying function, it is possible to improve the accuracy of the time-varying function and the accuracy of the estimated value. As a result, it is possible to set a more appropriate maintenance timing.

[0453] Embodiment 10

[0454] Next, Embodiment 10 will be described. The basic structure of the status monitoring device in Embodiment 10 is the same as Figure 14 the same. In addition, the status monitoring device in Embodiment 10 is a server.

[0455] The processing amount of each groove is stored as a parameter in the monitoring device main body 20. The initial value of the processing amount is 0.

[0456] Figure 31 is a flowchart showing a part of the operation of the status monitoring device in Embodiment 10. In step S901, the monitoring device main body 20 acquires discrete tension data, various data related to the rope specifications, data related to the groove cutting amount, etc. via the communication network line. A part of the various data related to the rope specifications, for example, the rope diameter d, may also be a fixed value.

[0457] Next, in step S902, the monitoring device main body 20 calculates continuous tension data.

[0458] Then, in step S903, the monitoring device main body 20 determines whether the tension state is below the reference value. Specifically, the monitoring device main body 20 determines whether the maximum tension and the amount of change in tension are respectively below the preset reference values.

[0459] If the tension state is below the reference value, then in step S904, the monitoring device main body 20 sets the machining amount of the groove, sends the set machining amount to the elevator, and ends the process. The maintenance operator mechanically machines each groove according to the sent machining amount. If the machining amount is the initial value, that is, 0, no machining is required.

[0460] When the tension state exceeds the reference value, in step S905, the monitoring device main body 20 updates by increasing the machining amount of each groove by a set amount.

[0461] Then, in step S906, the monitoring device main body 20 determines whether the machining of the updated machining amount can be achieved.

[0462] Specifically, the monitoring device main body 20 determines whether the operation time required for machining the updated machining amount is below the set time. If it is below the set time, it is determined that it can be achieved. In the case of exceeding the set time, it is determined that it cannot be achieved.

[0463] In addition, the monitoring device main body 20 determines whether the strength of the pulley 10 becomes above the set strength through the machining of the updated machining amount. If it is above the set strength, it is determined that it can be achieved. If it is less than the set strength, it is determined that it cannot be achieved.

[0464] If the machining of the updated machining amount can be achieved, the monitoring device main body 20 returns to the process of step S901. Then, in step S902, the monitoring device main body 20 calculates continuous tension data considering the updated machining amount. The monitoring device main body 20 repeats the above process until the tension state becomes below the reference value.

[0465] In the case where the machining of the updated machining amount cannot be achieved, it is difficult to make the tension state below the reference value even if the machining amount is increased. Therefore, in step S907, the monitoring device main body 20 sends an equipment replacement instruction to the elevator and ends the process.

[0466] The state monitoring method of Embodiment 10 includes a machining determination step, a machining amount setting step, and a tension calculation step identical to that of Embodiment 1. The machining determination step is a step of determining whether machining needs to be performed on each groove based on continuous tension data. The machining amount setting step is a step of setting the machining amount when it is determined that machining needs to be performed.

[0467] The state monitoring program of Embodiment 10 is a program that causes a computer to execute the above state monitoring method.

[0468] In addition, the recording medium of Embodiment 10 is a computer-readable recording medium that records the elevator state monitoring program for causing a computer to execute the above state monitoring method. The state monitoring program is stored in a storage medium (such as Figure 33 the memory 202) in a readable form. Moreover, the processing described in the state monitoring program read from the storage medium is executed by the computer.

[0469] In such a state monitoring method, state monitoring program, recording medium, and state monitoring device, it is determined whether machining needs to be performed on each groove, and the machining amount is set when necessary. Therefore, the efficiency of the maintenance work for the pulley 10 can be improved.

[0470] In addition, in the machining amount setting step, it is determined whether machining can be achieved, and if not, an equipment replacement instruction is sent. Therefore, the replacement of the equipment can be carried out at a more appropriate time.

[0471] Furthermore, in Embodiments 1 to 10, among the multiple parameters that are input data of the tension model, as data other than the above data, it may also include the loading history data of the car 12, the actual driving history data of the car 12, data related to the friction state, etc. Thus, the estimation accuracy can be improved.

[0472] The loading history data is data related to the loading amount of each trip of the car 12. The driving history data is data related to the driving distance of each trip of the car 12 and can be obtained based on the rotation speed of the pulley 10. The data related to the friction state is data related to the friction coefficient between the pulley 10 and the rope 11 and can be obtained from a function with at least any one of the viscosity of the lubricating oil, the temperature of the use environment, the humidity of the use environment, the surface pressure between the pulley 10 and the rope 11, etc. as parameters.

[0473] In addition, in the aging change function, parameters such as the loading history data of the car 12, the actual running history data of the car 12, and the acceleration / deceleration history data of the car 12 can also be included. Thus, by estimating the continuous tension data more accurately, the degree of aging change of each component can be estimated more accurately. The acceleration / deceleration history data is data related to the positions where the car 12 accelerates and decelerates during each run of the car 12.

[0474] In addition, in the aging change function, as parameters, the number of bending times of each part of the rope 11 can also be included. Thus, the degree of aging change of each part of the rope 11 can be estimated more accurately.

[0475] In addition, the method for obtaining the discrete tension data is not limited to the measurement by the tension measuring device 25. For example, the tension value can also be converted from the vibration period of the rope 11 obtained by the vibration method.

[0476] In addition, the rope in the present disclosure is a rope in a broad sense and includes, for example, a belt for suspending the car.

[0477] In addition, the elevator can also be an elevator with a machine room, a machine-roomless elevator, a double-deck elevator, an elevator in a single-hoistway multi-car mode, etc. The single-hoistway multi-car mode is a mode in which the upper car and the lower car arranged directly below the upper car are respectively lifted and lowered independently in a common hoistway.

[0478] In addition, Embodiments 2 to 10 can be implemented by appropriate combination.

[0479] As an example, Embodiment 8 and Embodiment 9 can also be implemented in combination. In this case, the monitoring device main body 20 calculates the continuous tension data using the value of the future Young's modulus E and the value of the future cross-sectional area A in the rope 11 and the value of the future groove cutting amount in the pulley 10. Therefore, the continuous tension data at the future cumulative running distance can be calculated with higher accuracy, and the determination accuracy of the arrival of the maintenance period is improved.

[0480] In addition, as another example, Embodiment 6, Embodiment 8, and Embodiment 9 can also be implemented in combination. In this case, the monitoring device main body 20 calculates the continuous tension data using the value of the future Young's modulus E and the value of the future cross-sectional area A in the rope 11 and the value of the future groove cutting amount in the pulley 10. Further, the monitoring device main body 20 determines whether there is an abnormality in the aging change data for the parameters that change over time (the value of the future Young's modulus E, the value of the future cross-sectional area A, the value of the future groove cutting amount). Thus, it can be known which parameter among the parameters that change over time reaches the aging change allowable value when the maintenance period arrives. Therefore, it can be determined which of the rope 11 and the pulley 10 has deteriorated. Therefore, the deteriorated part can be determined early, and the efficiency of the maintenance work can be improved.

[0481] In addition, as another example, Embodiment 7 and Embodiment 10 may be implemented in combination. In this case, in the operation of the state monitoring device of Embodiment 10, when the monitoring device main body 20 determines in step S906 Figure 31 that the time required for machining the updated machining amount exceeds the set time and cannot be achieved, through the processing shown in Embodiment 7, the adjustment amount of the tension of each rope 11 is calculated so that the depths of the multiple grooves approach equal values. The maintenance operator adjusts the tension of each rope 11 according to the received adjustment amount. In this way, by combining Embodiment 7 and Embodiment 10, even when the operation time required for machining each groove cannot be ensured, the groove depth can be adjusted so that the groove depths of each groove are in a desired state.

[0482] The above combinations of embodiments are examples, and they may also be implemented in other combinations.

[0483] In addition, each function of the monitoring device main body 20 in Embodiments 1 to 10 is implemented by a processing circuit. Figure 32 FIG. is a structural diagram showing a first example of a processing circuit that implements each function of the monitoring device main body 20 in Embodiments 1 to 10. The processing circuit 100 of the first example is dedicated hardware.

[0484] In addition, the processing circuit 100 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. In addition, each function of the monitoring device main body 20 may be implemented separately by the processing circuit 100, or each function may be implemented uniformly by the processing circuit 100.

[0485] In addition, Figure 33 FIG. is a structural diagram showing a second example of a processing circuit that implements each function of the monitoring device main body 20 in Embodiments 1 to 10. The processing circuit 200 of the second example includes a processor 201 and a memory 202.

[0486] In the processing circuit 200, each function of the monitoring device main body 20 is implemented by software, firmware, or a combination of software and firmware. The software and firmware are described as programs and stored in the memory 202. The processor 201 reads and executes the programs stored in the memory 202, thereby implementing each function.

[0487] It can also be said that the program stored in the memory 202 is a program that causes a computer to execute the steps or methods of the above-mentioned respective parts. Here, the memory 202 is, for example, a non-volatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable Read Only Memory), or an EEPROM (Electrically Erasable and Programmable Read Only Memory). In addition, a magnetic disk, a floppy disk, an optical disk, a high-density disk, a mini disk, a DVD, etc. also correspond to the memory 202.

[0488] In addition, regarding the functions of the above-mentioned respective parts, part of them can be implemented by dedicated hardware, and part of them can be implemented by software or firmware.

[0489] In this way, the processing circuit can implement the functions of the above-mentioned respective parts through hardware, software, firmware, or a combination thereof.

[0490] Reference Numeral Explanation

[0491] 10: pulley; 11: rope; 12: car; 13: counterweight; 20: monitoring device main body.

Claims

1. A method for monitoring the state of an elevator, wherein, the method for monitoring the state of the elevator includes the following tension calculation steps: for each of a plurality of ropes wound around a sheave having a plurality of grooves and suspending a car and a counterweight, the winding side portion and the payout side portion with respect to the sheave are respectively modeled as springs, and the tension of each of the plurality of ropes is calculated using a tension model composed of a plurality of equations of motion. The tension model takes discrete tension data and a plurality of parameters as input data, and the discrete tension data includes measured values of the tension of each of the ropes in a state where the car is at a measured position in a hoistway. The tension model takes continuous tension data as output data, and the continuous tension data is continuous data of the tension of each of the ropes including estimated values of the tension of each of the ropes in a state where the car is at a position other than the measured position. In the tension model, the displacement amount given to the sheave side end portions in each of the winding side portions and each of the payout side portions is set to a value obtained by subtracting the rope elongation amount in the winding amount from the winding amount of the sheave, that is, the rope free length.

2. The method for monitoring the state of an elevator according to claim 1, wherein, as the parameter, the tension model takes measured values of the depth of each of the grooves as input data.

3. The method for monitoring the state of an elevator according to claim 1 or 2, wherein, the rope elongation amount is a value proportional to the rope free length and the tension of the winding side portion.

4. The method for monitoring the state of an elevator according to any one of claims 1 to 3, wherein, the rope free length is a function of the winding amount and the tension of the winding side portion.

5. The method for monitoring the state of an elevator according to any one of claims 1 to 4, wherein, the length of the winding side portion and the length of the payout side portion are calculated based on the rope free length.

6. The method for monitoring the state of an elevator according to any one of claims 1 to 5, wherein, the tension of the winding side portion is calculated based on the displacement difference between the upper end and the lower end of the winding side portion, and the tension of the payout side portion is calculated based on the displacement difference between the upper end and the lower end of the payout side portion.

7. The method for monitoring the state of an elevator according to any one of claims 1 to 6, wherein, the rope stiffness of the winding side portion is a function of the Young's modulus of the rope, the cross-sectional area of the rope, and the length of the winding side portion, and the rope stiffness of the payout side portion is a function of the Young's modulus of the rope, the cross-sectional area of the rope, and the length of the payout side portion.

8. The method for monitoring the state of an elevator according to any one of claims 1 to 7, wherein, the method for monitoring the state of the elevator further includes the following parameter value update step: when the difference between the continuous tension data and the discrete tension data is equal to or greater than a differential threshold, at least one of the plurality of parameters is updated so that the continuous tension data and the discrete tension data are consistent.

9. The elevator status monitoring method according to any one of claims 1 to 8, wherein, the elevator status monitoring method further includes an adjustment amount sending step as follows: sending the calculated adjustment amount of the tension or the preset adjustment amount of the tension according to at least any one of the plurality of parameters and the continuous tension data.

10. The elevator status monitoring method according to claim 9, wherein, in the adjustment amount sending step, before sending the adjustment amount, it is determined whether the adjustment of the adjustment amount can be achieved, and in the case where it is determined that it cannot be achieved, the meaning of inability to adjust is reported.

11. The elevator status monitoring method according to any one of claims 1 to 10, wherein, the elevator status monitoring method further includes a maintenance instruction reporting step as follows: determining whether the tension of each of the ropes deviates from the tension allowable value according to the continuous tension data, and in the case where it deviates from the tension allowable value, reporting that a maintenance operation is required.

12. The elevator status monitoring method according to any one of claims 1 to 11, wherein, the elevator status monitoring method further includes an aging change monitoring step as follows: determining whether at least any one of the plurality of parameters deviates from the aging change allowable value, and in the case where it deviates from the aging change allowable value, reporting that a maintenance operation is required.

13. The elevator status monitoring method according to any one of claims 1 to 12, wherein, the elevator status monitoring method further includes a maintenance period calculation step as follows: calculating a future value, i.e., an estimated value, of the estimated object parameter according to a time-varying function representing the time-varying change of the estimated object parameter caused by the running of the car, and calculating a period when a maintenance operation is required, i.e., a maintenance period, according to the continuous tension data calculated using the estimated value, and the estimated object parameter is at least any one of the plurality of parameters.

14. The elevator status monitoring method according to claim 13, wherein, the elevator status monitoring method further includes a maintenance period monitoring step as follows: monitoring whether the maintenance period has been reached according to the cumulative running distance of the car.

15. The elevator status monitoring method according to any one of claims 1 to 14, wherein, the elevator status monitoring method further includes the following steps: a machining determination step of determining whether machining needs to be performed on each of the grooves according to the continuous tension data; and a machining amount setting step of setting a machining amount in the case where it is determined that the machining needs to be performed.

16. The elevator status monitoring method according to claim 15, wherein, in the machining amount setting step, it is determined whether the machining can be achieved, and in the case where it cannot be achieved, an equipment replacement instruction is sent.

17. An elevator status monitoring program, wherein, the elevator status monitoring program causes a computer to execute the status monitoring method according to any one of claims 1 to 16.

18. A recording medium, wherein, The recording medium records an elevator state monitoring program for causing a computer to execute the state monitoring method according to any one of claims 1 to 16.

19. An elevator state monitoring device, wherein: The elevator state monitoring device has a monitoring device main body, and for each of a plurality of ropes that are wound around a sheave having a plurality of grooves and suspend a car and a counterweight, the winding side portion and the payout side portion with respect to the sheave are respectively modeled as springs, and a tension model composed of a plurality of equations of motion is used to calculate the tension of each of the plurality of ropes. The tension model takes discrete tension data and a plurality of parameters as input data, and the discrete tension data includes measured values of the tension of each of the ropes in a state where the car is at a measurement position in the hoistway. The tension model takes continuous tension data as output data, and the continuous tension data is continuous data of the tension of each of the ropes including estimated values of the tension of each of the ropes in a state where the car is at a position other than the measurement position. In the tension model, the displacement amount given to the sheave side end portions in each of the winding side portions and each of the payout side portions is a value obtained by subtracting the rope elongation amount in the winding amount from the winding amount based on the sheave, that is, the rope free length.

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