Tension adjustment method for elevator

Abstract

To provide a tension adjusting method for an elevator that is able to save labor for the whole adjustment work.SOLUTION: A tension adjustment method includes an amount-of-adjustment determination step. The amount-of-adjustment determination step is a step of determining a first amount of adjustment to be applied to a first rope fastening device 21. The first amount of adjustment is determined from a value proportional to a value obtained by dividing a tension adjustment value by an equivalent spring constant. The tension adjustment value is a difference between a pre-adjustment tension value and the target tension value in a suspension body 7. The pre-adjustment tension value is the maximum value in the tension fluctuation of the suspension body 7 due to the movement of the car 8. The target tension value is the allowable upper limit value of the tension of the suspension body 7.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a method for adjusting tension in an elevator. [Background technology]

[0002] In a conventional elevator tension adjustment method, a detector detects state quantities related to the tension of each main rope. The state quantities detected by the detector are sent to a measurement processing device. The measurement processing device calculates the tension value of each main rope based on the state quantities of each main rope. The tension value of each main rope is sent to a portable terminal device carried by a maintenance worker. The portable terminal device creates a plan for adjusting the tension of multiple main ropes based on the tension value of each main rope. The maintenance worker carries out the adjustment work in accordance with the adjustment work plan displayed on the portable terminal device (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5268978 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional elevator tension adjustment method described above, after performing the adjustment work, the maintenance worker operates the car back and forth. Then, it is checked whether the tension of each main rope is within the allowable range. If the tension of any main rope is not within the allowable range, the tension is readjusted. This readjustment work is repeated many times until the tension of all main ropes is within the allowable range. For this reason, the tension adjustment work is quite time-consuming.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a method for adjusting the tension of an elevator that can reduce the labor required for the entire adjustment process. [Means for solving the problem]

[0006] The elevator tension adjustment method according to the present disclosure includes an adjustment amount determination step of determining a first adjustment amount to be applied to a first cleat device connected to a first end of a suspension body that suspends a car and a counterweight, and a cleat adjustment step of adjusting the first cleat device according to the first adjustment amount, where the first part is the part from the first end of the suspension body to the drive sheave when the car and counterweight are located at the same height, and in the adjustment amount determination step, the first adjustment amount is determined from a value proportional to the tension adjustment value, which is the difference between the pre-adjustment tension value and the target tension value in the suspension body, divided by the equivalent spring constant when the first part and the cleat spring of the first cleat device are considered to be series springs. [Effects of the Invention]

[0007] According to the elevator tension adjustment method disclosed herein, it is possible to reduce the labor required for the entire adjustment process. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing the configuration of an elevator according to a first embodiment. [Figure 2] FIG. 2 is a diagram showing the configuration of the first cleat device of FIG. 1. [Figure 3] FIG. 2 is an explanatory diagram schematically showing the main parts of the elevator of FIG. 1. [Figure 4] 10 is a graph showing a first example of fluctuations in tension of two suspension bodies due to movement of the car. [Figure 5] 10 is an explanatory diagram showing a first adjustment amount to be applied to a first cleat device and a second adjustment amount to be applied to a second cleat device. FIG. [Figure 6] 5 is a graph showing an example of tension fluctuation after tension adjustment of the two suspension bodies in FIG. 4. [Figure 7] FIG. 3 is a process diagram showing the flow of tension adjustment work in the first embodiment. [Figure 8] FIG. 10 is an explanatory diagram schematically showing the main parts of an elevator according to a second embodiment. [Figure 9] FIG. 10 is an explanatory diagram schematically showing the main parts of an elevator according to a modified example of embodiment 2. [Figure 10] 10 is a graph showing a second example of fluctuations in tension of two suspension bodies due to movement of the car. [Figure 11] FIG. 10 is a process diagram showing the flow of tension adjustment work in the third embodiment. [Figure 12] 13 is a graph showing an example of the relationship between discrete tension data and continuous tension data in the fourth embodiment. [Figure 13] FIG. 13 is an explanatory diagram showing the relationship between a tension analysis model and input / output data in the fourth embodiment. [Figure 14] 13 is a graph showing an example of the relationship between the ascending tension value, the descending tension value, and the average tension value in the fifth embodiment. [Figure 15] FIG. 10 is a process diagram showing the flow of tension adjustment work in the fifth embodiment. [Figure 16] 10 is a graph showing a third example of fluctuations in tension of two suspension bodies due to movement of the car. [Figure 17] 17 is a graph showing an example of tension fluctuation after tension adjustment of the two suspension bodies in FIG. 16. [Figure 18] FIG. 13 is a process diagram showing the flow of tension adjustment work in the sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. Embodiment 1 Fig. 1 is a schematic diagram showing the configuration of an elevator according to embodiment 1. In Fig. 1, a machine room 2 is provided above an elevator shaft 1. In the machine room 2, a hoisting machine 3 and a deflector sheave 6 are installed.

[0010] The hoist 3 has a hoist main body 4 and a drive sheave 5, which is a pulley. The hoist main body 4 has a hoist motor (not shown) and a hoist brake (not shown). The hoist motor rotates the drive sheave 5. The hoist brake keeps the drive sheave 5 stationary. The hoist brake also brakes the rotation of the drive sheave 5.

[0011] A plurality of suspension bodies 7 are wound around the drive sheave 5 and the deflector sheave 6. Only one suspension body 7 is shown in FIG. 1. Each suspension body 7 is a rope or belt. The drive sheave 5 is provided with a plurality of sheave grooves (not shown). A corresponding suspension body 7 is inserted into each sheave groove.

[0012] The car 8 and the counterweight 9 are suspended in the hoistway 1 by a plurality of suspension bodies 7. The car 8 and the counterweight 9 move up and down in the hoistway 1 by rotating the drive sheave 5.

[0013] A pair of car guide rails 10 and a pair of counterweight guide rails 11 are installed in the hoistway 1. In Fig. 1, only one car guide rail 10 and one counterweight guide rail 11 are shown.

[0014] A pair of car guide rails 10 guide the car 8 as it moves up and down. A pair of counterweight guide rails 11 guide the counterweight 9 as it moves up and down.

[0015] The car 8 has a car frame 12 and a cab 13. The suspension body 7 is connected to the car frame 12. The cab 13 is supported by the car frame 12.

[0016] Each suspension body 7 has a first end 7a and a second end 7b. The first end 7a is one end in the longitudinal direction of the suspension body 7. The second end 7b is the end opposite to the first end 7a in the longitudinal direction of the suspension body 7.

[0017] A first cleat device 21 is connected to each first end 7a. Each first end 7a is connected to the car 8 via the first cleat device 21. A second cleat device 22 is connected to each second end 7b. Each second end 7b is connected to the counterweight 9 via the second cleat device 22.

[0018] Fig. 2 is a structural diagram showing the first cleat device 21 of Fig. 1. The first cleat device 21 has a base 23, a shackle rod 24, a cleat spring 25, a spring seat 26, a spring holder 27, and a pair of nuts 28.

[0019] The base 23 is fixed to the underside of the upper beam of the car frame 12. The shackle rod 24 passes through the base 23 and the upper beam. The first end 7a of the corresponding suspension body 7 is connected to the upper end of the shackle rod 24.

[0020] The cleat spring 25 is disposed below the base 23. The cleat spring 25 expands and contracts according to the tension of the corresponding suspension body 7. The cleat spring 25 has a shackle rod 24 passing through it.

[0021] The spring seat 26 is interposed between the cleat spring 25 and the base 23. The shackle rod 24 passes through the spring seat 26.

[0022] The spring bearing 27 is disposed below the cleat spring 25. The corresponding shackle rod 24 passes through the spring bearing 27. The cleat spring 25 is sandwiched between the spring seat 26 and the spring bearing 27.

[0023] The pair of nuts 28 are screwed onto the lower end of the shackle rod 24, i.e., onto the portion of the shackle rod 24 that protrudes from the spring retainer 27. The pair of nuts 28 function as double nuts. By adjusting the amount of tightening of the pair of nuts 28, the tension of the corresponding suspension body 7 can be adjusted.

[0024] The configuration of the second cleat device 22 is similar to the configuration of the first cleat device 21.

[0025] Figure 3 is an explanatory diagram that shows a schematic view of the main parts of the elevator in Figure 1. Figure 3 shows a state in which the car 8 and the counterweight 9 are positioned at the same height. In this case, the portion of the suspension body 7 from the first end 7a to the drive sheave 5 is referred to as the first portion. Furthermore, the portion of the suspension body 7 from the second end 7b to the drive sheave 5 is referred to as the second portion.

[0026] When the car 8 and the counterweight 9 are located at the same height, the lengths of the first and second portions of the suspension body 7 are equal to each other. Therefore, when the first and second portions are viewed as springs, the spring constant of the first and second portions is the same value Kr.

[0027] The first end 7a is connected in series with the cleat spring 25 of the first cleat device 21. The second end 7b is connected in series with the cleat spring 25 of the second cleat device 22. Here, the spring constant of the cleat spring 25 of the first cleat device 21 and the spring constant of the cleat spring 25 of the second cleat device 22 are assumed to be the same value Ks.

[0028] The tension adjustment method of the first embodiment includes an adjustment amount determination step, a cleat adjustment step, and a reciprocating travel step. The adjustment amount determination step is a step of determining a first adjustment amount to be applied to the first cleat device 21 and a second adjustment amount to be applied to the second cleat device 22. Here, the second adjustment amount is determined to be the same value as the first adjustment amount.

[0029] In the adjustment amount determination step, the first adjustment amount is determined from a value proportional to a value obtained by dividing the tension adjustment value by the equivalent spring constant. The tension adjustment value is the difference between the pre-adjustment tension value and the target tension value in the suspension body 7.

[0030] The pre-adjustment tension value is the maximum value of the tension fluctuation of the suspension body 7 due to the movement of the car 8. The target tension value is the upper limit of the allowable tension of the suspension body 7, and is the value obtained by dividing the breaking strength of the suspension body 7 by the safety factor. The equivalent spring constant is the spring constant when the first section and the cleat spring 25 of the first cleat device 21 are considered as one series spring.

[0031] It can be said that the spring constant Kr of the first portion when the car 8 is located at the intermediate floor is the average value of the spring constant of the suspension body 7 which changes depending on the car position.

[0032] The cleat adjusting step is a step of adjusting the first cleat device 21 according to the first adjustment amount and adjusting the second cleat device 22 according to the second adjustment amount.

[0033] The reciprocating running process is a process in which the car 8 is made to reciprocate after the cleat adjustment process, and the tension of the suspension body 7 is stabilized.

[0034] Fig. 4 is a graph showing a first example of the tension fluctuations in the two suspension bodies 7 due to the movement of the car 8. Fig. 4 shows the tension fluctuations in the two suspension bodies 7 when the car 8 travels back and forth between the lowest floor and the top floor.

[0035] In addition, in Figure 4, the tension fluctuation of the first suspension body, which is one of the two suspension bodies 7, is shown by a solid line, and the tension fluctuation of the second suspension body, which is the other of the two suspension bodies 7, is shown by a dotted line.

[0036] Even if the tension of all suspension bodies 7 is adjusted uniformly when the elevator is installed, differences in the elongation of each suspension body 7 over time will cause variations in the tension of each suspension body 7. This will result in differences in the amount of wear of each sheave groove, and differences will occur in the tension fluctuations of each suspension body 7 due to the movement of the car 8, as shown in Figure 4.

[0037] Furthermore, when the car 8 travels back and forth, the trajectory of the tension fluctuation of each suspension body 7 forms a loop as shown in Figure 4. That is, even if the car is at the same position, the tension of each suspension body 7 has a different value when the car 8 is ascending and descending.

[0038] In the example of Figure 4, the maximum value of the tension fluctuation of the first suspension body near the top floor exceeds the allowable upper limit. Therefore, the difference dT between the maximum value and the allowable upper limit, which is the target tension value, becomes the tension adjustment value.

[0039] FIG. 5 is an explanatory diagram showing the first adjustment amount given to the first cleat device 21 and the second adjustment amount given to the second cleat device 22.

[0040] When the tension of the first suspension fluctuates as shown by the solid line in Figure 4, the first adjustment amount Scar1 for the first suspension is an adjustment amount that loosens the cleat spring 25 to reduce the tension. On the other hand, when the tension of the second suspension fluctuates as shown by the dotted line in Figure 4, the first adjustment amount Scar2 for the second suspension is an adjustment amount that tightens the cleat spring 25 to increase the tension.

[0041] If the tightening adjustment amount is defined as positive and the loosening adjustment amount is defined as negative, the first adjustment amount Scar1 for the first suspended body and the first adjustment amount Scar2 for the second suspended body are given by the following equations.

[0042] Scar1=-C×dT / Keqv

[0043] Scar2=+C×dT / Keqv

[0044] Note that C is a proportionality constant, and Keqv is the equivalent spring constant.

[0045] The first adjustment amounts Scar1 and Scar2 are proportional to the tension adjustment value dT and inversely proportional to the equivalent spring constant Keqv.

[0046] The equivalent spring constant Keqv is calculated from the spring constant Kr of the first portion of the suspension body 7 and the spring constant Ks of the cleat spring 25 by the following formula.

[0047] Keqv=Kr×Ks / (Kr+Ks)

[0048] On the other hand, the second adjustment amount Scwt1 for the first suspended body and the second adjustment amount Scwt2 for the second suspended body are respectively given by the following equations.

[0049] Scwt1=Scar1

[0050] Scwt2=Scar2

[0051] That is, the second adjustment amounts Scwt1 and Scwt2 are the same values ​​as the first adjustment amounts Scar1 and Scar2, respectively.

[0052] Fig. 6 is a graph showing an example of tension fluctuation after tension adjustment of the two suspension bodies 7 in Fig. 4. As can be seen from a comparison with the graph in Fig. 4, after tension adjustment, the trajectory of tension fluctuation of the first suspension body is lower overall than before tension adjustment. Furthermore, after tension adjustment, the maximum value of tension fluctuation of the first suspension body does not exceed the allowable upper limit.

[0053] Furthermore, the locus of the tension fluctuation of the second suspension body is higher overall than before the tension adjustment, thereby suppressing the tension variation between the suspension bodies 7.

[0054] 7 is a process diagram showing the flow of the tension adjustment work in Embodiment 1. When the tension adjustment work is started, in step S101, the tension of each suspension body 7 is continuously measured while the car 8 is being moved, and continuous tension values ​​are obtained.

[0055] Thereafter, in step S102, the maximum value of the tension fluctuation is extracted for each suspension body 7. Then, in step S103, it is determined whether the maximum value for each suspension body 7 is equal to or less than the allowable upper limit.

[0056] If the maximum tension values ​​in all of the suspension bodies 7 are equal to or less than the allowable upper limit, no tension adjustment is required, and the work for that round is completed.

[0057] On the other hand, if the maximum tension value of any of the suspension bodies 7 exceeds the allowable upper limit, one or more suspension bodies 7 for which tension should be adjusted are selected in step S104. In this case, all of the suspension bodies 7 may be selected, or only some of the suspension bodies 7 may be selected. For example, only the suspension body 7 with the highest maximum tension value and the suspension body 7 with the lowest maximum tension value may be selected.

[0058] Next, in step S105, the first adjustment amount and the second adjustment amount are calculated using the method described above. Then, in step S106, first cleat device 21 is adjusted according to the first adjustment amount, and second cleat device 22 is adjusted according to the second adjustment amount, and the work is completed.

[0059] After such tension adjustment work, the car 8 is made to travel back and forth, thereby stabilizing the tension of each suspension body 7. As a result, the value of tension fluctuation in each suspension body 7 falls within the allowable upper limit value as shown in FIG.

[0060] In this elevator tension adjustment method, the first adjustment amount is uniquely determined from a value proportional to the tension adjustment value divided by the equivalent spring constant of the series spring consisting of the first part of the suspension body 7 and the cleat spring 25 of the first cleat device 21.

[0061] This reduces the time and effort required to repeatedly adjust the tension and check the tension after adjustment, thereby reducing the labor required for the entire adjustment process.

[0062] Furthermore, when adjusting the tension of a plurality of suspension bodies 7, it is only necessary to give a predetermined amount of adjustment to each suspension body 7, so there is no need to determine the order of adjustment.

[0063] Furthermore, the amount of adjustment given to a certain suspension body 7 is the same regardless of the position of the car 8, which improves workability.

[0064] Furthermore, in the adjustment amount determination step, the second adjustment amount is determined to be the same value as the first adjustment amount, which makes it possible to easily adjust the second cleat device 22.

[0065] Furthermore, the pre-adjustment tension value is the maximum value of the tension fluctuation of the suspension body 7 due to the movement of the car 8. Therefore, the maximum value of the tension fluctuation can be reduced to or below the allowable upper limit value, and deterioration of the suspension body 7 can be efficiently suppressed.

[0066] The target tension value is not limited to the upper allowable limit value, but may be, for example, the lower allowable limit value. In this case, when the minimum value of tension fluctuation falls below the lower allowable limit value, the difference between the minimum value and the lower allowable limit value may be set as the tension adjustment value.

[0067] Furthermore, in the cleat adjustment process, only the first cleat device 21 may be adjusted without adjusting the second cleat device 22. In this case, in the adjustment amount determination process, the first adjustment amount is determined to be twice the value of the first adjustment amount when both the first cleat device 21 and the second cleat device 22 are adjusted.

[0068] For example, when only the first cleat device 21 is adjusted, the adjustment amounts are as follows:

[0069] Scar1=-2×C×dT / Keqv

[0070] Scar2=+2×C×dT / Keqv

[0071] Scwt1=Scwt2=0

[0072] In this case, only the first cleat device 21 needs to be adjusted, thereby reducing the work time.

[0073] Furthermore, the spring constant of the cleat spring 25 in the second cleat device 22 may be different from the spring constant of the cleat spring 25 in the first cleat device 21 .

[0074] In this case, if the spring constant of the cleat spring 25 in the first cleat device 21 is Kscar and the spring constant of the cleat spring 25 in the second cleat device 22 is Kscwt, the equivalent spring constant Keqvcar on the car 8 side and the equivalent spring constant Keqvcwt on the counterweight 9 side are expressed by the following equations.

[0075] Keqvcar=Kr×Kscar / (Kr+Kscar)

[0076] Keqvcwt=Kr×Kscwt / (Kr+Kscwt)

[0077] By using these equivalent spring constants Keqvcar and Keqvcwt, the first adjustment amounts Scar1 and Scar2 are given by the following equations.

[0078] Scar1=-C×dT / Keqvcar

[0079] Scar2=+C×dT / Keqvcar

[0080] Moreover, the second adjustment amounts Scwt1 and Scwt2 are given by the following equations because the equivalent spring constant is different from that on the car 8 side.

[0081] Scwt1=-C×dT / Keqvcwt

[0082] Scwt2=+C×dT / Keqvcwt

[0083] Furthermore, when only the first cleat device 21 is adjusted, the adjustment amounts are as follows.

[0084] Scar1=-2×C×dT / Keqvcar

[0085] Scar2=+2×C×dT / Keqvcar

[0086] Scwt1=Scwt2=0

[0087] Embodiment 2 Next, Fig. 8 is an explanatory diagram showing a schematic diagram of the main parts of an elevator according to embodiment 2. The first cleat device 21 and the second cleat device 22 are each provided at the top of the elevator shaft 1. Furthermore, the first cleat device 21 and the second cleat device 22 are each installed upside down compared to Fig. 2.

[0088] The car 8 is provided with a car hoisting sheave 8a as a pulley. The counterweight 9 is provided with a counterweight hoisting sheave 9a as a pulley.

[0089] The suspension body 7 is wound around the car sheave 8a, the drive sheave 5, and the counterweight sheave 9a in this order from the first end 7a, and continues to the second end 7b. In other words, the elevator of the second embodiment is a 2:1 roping type elevator.

[0090] 8 shows a state in which the car 8 and counterweight 9 are located at the same height. In this case, the portion of the suspension body 7 from the first end 7a to the car sheave 8a is defined as the first portion. Also, the portion of the suspension body 7 from the second end 7b to the counterweight sheave 9a is defined as the second portion.

[0091] The portion of the suspension body 7 from the drive sheave 5 to the car sheave 8a is defined as a third portion. The portion of the suspension body 7 from the drive sheave 5 to the counterweight sheave 9a is defined as a fourth portion.

[0092] The lengths of the first, second, third, and fourth sections are all equal. Therefore, the spring constant of each section is expressed as 2Kr. The spring constant of the suspension body 7 on the car 8 side, determined by the overall length of the first and third sections, can be calculated as the spring constant of a series spring consisting of two springs with a spring constant of 2Kr, so it is Kr.

[0093] Similarly, the spring constant of the suspension 7 on the side of the counterweight 9, which is determined by the overall length of the second and fourth portions, is also Kr.

[0094] Therefore, the equivalent spring constant of the series spring determined by the spring constant Kr of the suspension body 7 and the spring constant Ks of the cleat spring 25 can be found from the same formula as the equivalent spring constant Keqv in the first embodiment.

[0095] In a 2:1 roping elevator, the car sheave 8a and the counterweight sheave 9a each function as a movable pulley. Therefore, the tension in the first portion of the suspension body 7 is the same as the tension in the third portion. Similarly, the tension in the second portion of the suspension body 7 is the same as the tension in the fourth portion.

[0096] For this reason, when a first adjustment amount similar to that of a 1:1 roping type elevator is applied to the first cleat device 21, the amount of tension change caused by applying the first adjustment amount is distributed to both sides of the car hoist 8a, and becomes half of the desired amount of tension change.

[0097] Therefore, in order to generate the desired amount of tension change, the first adjustment amount needs to be twice the first adjustment amount in an elevator using a 1:1 roping system. That is, the first adjustment amount in an elevator using a 2:1 roping system is set to be twice the first adjustment amount in an elevator using a 1:1 roping system. Other tension adjustment methods in the second embodiment are the same as those in the first embodiment.

[0098] According to this elevator tension adjustment method, even in elevators using a 2:1 roping system, it is possible to reduce the labor required for the entire adjustment process.

[0099] 9 is an explanatory diagram showing a schematic diagram of the main parts of an elevator according to a modification of the second embodiment. In the modification of the second embodiment, the drive sheave 5 is disposed at the bottom of the hoistway 1. At the top of the hoistway 1, a car return wheel 14 and a counterweight return wheel 15 are provided.

[0100] The suspension body 7 is wound around, in order from the first end 7a, the car sheave 8a, the car return sheave 14, the drive sheave 5, the counterweight return sheave 15, and the counterweight sheave 9a, and reaches the second end 7b. In other words, the elevator of the modified example of the second embodiment is also a 2:1 roping type elevator.

[0101] 9 shows a state in which the car 8 and counterweight 9 are located at the same height. In this case, the portion of the suspension body 7 from the first end 7a to the car sheave 8a is defined as the first portion. Also, the portion of the suspension body 7 from the second end 7b to the counterweight sheave 9a is defined as the second portion.

[0102] Furthermore, the portion of the suspension body 7 from the car hoisting sheave 8a to the car return sheave 14 is defined as the third portion. Furthermore, the portion of the suspension body 7 from the car return sheave 14 to the drive sheave 5 is defined as the fourth portion. Furthermore, the portion of the suspension body 7 from the counterweight hoisting sheave 9a to the counterweight return sheave 15 is defined as the fifth portion. Furthermore, the portion of the suspension body 7 from the counterweight return sheave 15 to the drive sheave 5 is defined as the sixth portion.

[0103] In this case, the spring constant of the first part is 4Kr, the spring constant of the third part is 4Kr, the spring constant of the fourth part is 2Kr, the spring constant of the second part is 4Kr, the spring constant of the fifth part is 4Kr, and the spring constant of the sixth part is 2Kr.

[0104] In addition, in the configuration of Fig. 9, the car sheave 8a and the counterweight sheave 9a each function as a movable pulley, similar to the configuration of Fig. 8. Therefore, the first adjustment amount is set to twice the first adjustment amount in a 1:1 roping type elevator.

[0105] This makes it possible to reduce the labor required for the entire adjustment process, even in elevators using a 2:1 roping system such as that shown in Figure 9.

[0106] 8 and 9, both the first cleat device 21 and the second cleat device 22 may be adjusted, or only the first cleat device 21 may be adjusted. When only the first cleat device 21 is adjusted without adjusting the second cleat device 22, the first adjustment amount is determined to be twice the value of the first adjustment amount when both the first cleat device 21 and the second cleat device 22 are adjusted.

[0107] Embodiment 3 Next, a tension adjustment method for an elevator according to embodiment 3 will be described. The pre-adjustment tension value in embodiment 3 is the larger of the tension value of suspension body 7 measured when car 8 is located at the lowest floor and the tension value of suspension body 7 measured when car 8 is located at the highest floor. Other tension adjustment methods in embodiment 3 are the same as those in embodiment 1.

[0108] Fig. 10 is a graph showing a second example of tension fluctuations in the two suspension bodies 7 due to movement of the car 8. In Fig. 10, similar to Fig. 4, tension fluctuations in the first suspension body are shown by a solid line, and tension fluctuations in the second suspension body are shown by a dotted line.

[0109] Generally, the maximum value in tension fluctuation often occurs when the car 8 is stopped at the top floor or the bottom floor.

[0110] Therefore, in the third embodiment, instead of measuring continuous tension values ​​throughout the entire ascending / descending stroke, the tension value of the suspension body 7 when the car 8 is located at the lowest floor and the tension value of the suspension body 7 when the car 8 is located at the highest floor are measured. The larger tension value is then considered to be the maximum value in the tension fluctuation.

[0111] 11 is a process diagram showing the flow of tension adjustment work in embodiment 3. When tension adjustment work is started, in step S201, the tension value of each suspension body 7 when the car 8 is located on the top floor and the tension value of each suspension body 7 when the car 8 is located on the bottom floor are measured. The tension value measurements may be performed first on either the top floor or the bottom floor.

[0112] The steps from step S102 onwards are the same as those in the first embodiment.

[0113] This tension adjustment method also reduces the labor required for the entire adjustment process. Furthermore, compared to acquiring continuous tension values, the amount of data processing required can be significantly reduced, shortening the time required for tension measurement. This also shortens the time required for the entire adjustment process.

[0114] In addition, in an elevator using a 2:1 roping system as shown in the second embodiment, the pre-adjustment tension value may be determined in the same manner as in the third embodiment.

[0115] Embodiment 4 Next, a method for adjusting the tension of an elevator according to embodiment 4 will be described. In embodiment 4, continuous tension data, which is the tension fluctuation of the suspension body 7 throughout the entire ascent / descent stroke, is obtained by inputting discrete tension data into a tension analysis model. The discrete tension data is the tension value of the suspension body 7 measured during only a portion of the ascent / descent stroke of the car 8.

[0116] The maximum value in the tension fluctuation is extracted from the obtained continuous tension data. The extracted maximum value is then used as the pre-adjustment tension value. Other tension adjustment methods in the fourth embodiment are the same as those in the first embodiment.

[0117] The tension analysis model takes discrete tension data and multiple parameters as input data and continuous tension data as output data. In addition, in the tension analysis model, the amount of displacement applied to the pulley-side end of the winding-side portion of each suspension body 7 is the free length of the suspension body 7. The free length of the suspension body 7 is the value obtained by subtracting the amount of extension of the suspension body 7 from the amount of winding by the pulley.

[0118] The plurality of parameters includes a plurality of types of data relating to the specifications of the suspension body 7 and data relating to the amount of groove wear.

[0119] The multiple types of data relating to the specifications of the suspension body 7 include Young's modulus E, cross-sectional area A, rope diameter d, linear density ρ, number N, and spring constant Ks of the cleat spring 25. At least one of these data, for example, rope diameter d, may be a fixed value. Data relating to the amount of groove wear is the actual measured value of the depth of each sheave groove.

[0120] Fig. 12 is a graph showing an example of the relationship between discrete tension data and continuous tension data in embodiment 4. Fig. 13 is an explanatory diagram showing the relationship between a tension analysis model and input / output data in embodiment 4.

[0121] In the tension adjustment method according to the fourth embodiment, discrete tension data and a plurality of parameters are input to the tension analysis model described above. This results in continuous tension data being output. As the discrete tension data, for example, one or more measured values ​​as shown in FIG. 12 are input to the tension analysis model.

[0122] This tension adjustment method also reduces the labor required for the entire adjustment process. Furthermore, the time required for tension measurement can be reduced compared to when continuous tension values ​​are obtained through measurement. This also reduces the time required for the entire adjustment process.

[0123] In addition, in an elevator using a 2:1 roping system as shown in the second embodiment, the pre-adjustment tension value may be determined in the same manner as in the fourth embodiment.

[0124] Embodiment 5. Next, a description will be given of a method for adjusting the tension of an elevator according to embodiment 5. In embodiments 1 to 4, the allowable upper limit value of the suspension body 7 is set as the target tension value. In contrast, in embodiment 5, the average value of the average tension values ​​of all suspension bodies 7 is set as the target tension value.

[0125] The average tension value is the average value of the ascending tension value and the descending tension value of each suspension body 7. The ascending tension value is the tension value of the suspension body 7 measured at an intermediate floor when the car 8 is ascended from the lowest floor. The descending tension value is the tension value of the suspension body 7 measured at an intermediate floor when the car 8 is descended from the top floor. The ascending tension value and the descending tension value are measured at the same intermediate floor.

[0126] The pre-adjustment tension value for each suspension body 7 is an average tension value. The tension adjustment value for each suspension body 7 is the difference between the pre-adjustment tension value for that suspension body 7 and the target tension value. The first adjustment amount to be applied to each first cleat device 21 is calculated in the same manner as in embodiment 1 or 2.

[0127] Fig. 14 is a graph showing an example of the relationship between the tension value during ascent, the tension value during descent, and the average tension value in embodiment 5. When there is a difference in the amount of wear between multiple sheave grooves, as shown in Fig. 14, the tension of each suspension body 7 fluctuates along different trajectories when the car 8 is ascending and descending.

[0128] On the other hand, if the average tension values ​​at the intermediate floors of all suspension bodies 7 can be made the same, the variation in tension over the entire ascending / descending stroke can be reduced.

[0129] 15 is a process diagram showing the flow of tension adjustment work in embodiment 5. When tension adjustment work is started, in step S301, the car 8 is moved from the lowest floor to an intermediate floor. Then, in step S302, the tension value of each suspension body 7 during ascent at the intermediate floor is measured.

[0130] Thereafter, in step S303, the car 8 is moved from the intermediate floor to the top floor. Subsequently, in step S304, the car 8 is moved from the top floor to the intermediate floor. Then, in step S305, the descending tension value of each suspension body 7 at the intermediate floor is measured.

[0131] Next, in step S306, the average tension value is calculated for each suspension body 7. Subsequently, in step S307, the average tension values ​​of all suspension bodies 7 are averaged to calculate the target tension value.

[0132] Thereafter, in step S308, a first adjustment amount to be applied to each first cleat device 21 is calculated. A second adjustment amount to be applied to each second cleat device 22 is determined in the same manner as in the first or second embodiment.

[0133] Next, in step S309, adjustment work is performed on the first cleat device 21 and the second cleat device 22, or adjustment work is performed on the first cleat device 21 only, and the tension adjustment work is completed.

[0134] It is noted that either the ascending tension value or the descending tension value may be measured first.

[0135] This tension adjustment method also reduces the labor required for the entire adjustment process. In addition, the average tension values ​​at the intermediate floors of all suspension bodies 7 can be made consistent, thereby reducing tension variations throughout the entire lifting process.

[0136] This makes it possible to suppress the increase in the variation in the amount of wear between the sheave grooves caused by the variation in tension. If the increase in the variation in the amount of wear between the sheave grooves can be suppressed, the variation in tension fluctuation for each car position, i.e., the gradient of tension fluctuation with respect to the car position, can be suppressed, and deterioration of the suspension body 7 due to excessive tension can be suppressed.

[0137] In addition, in an elevator using a 2:1 roping system such as that shown in the second embodiment, the target tension value and the pre-adjustment tension value may be determined in the same manner as in the fifth embodiment.

[0138] Embodiment 6 Next, a method for adjusting elevator tension according to embodiment 6 will be described. In embodiment 6, the average value of the specific floor tension values ​​for all suspension bodies 7 is set as the target tension value. The specific floor tension value is the tension value of each suspension body 7 when the car 8 is located at any position, including but not limited to the lowest floor, the top floor, an intermediate floor, etc.

[0139] The pre-adjustment tension value for each suspension body 7 is the specific floor tension value. The tension adjustment value for each suspension body 7 is the difference between the pre-adjustment tension value for that suspension body 7 and the target tension value. The first adjustment amount to be applied to each first cleat device 21 is calculated in the same manner as in embodiment 1 or 2.

[0140] Here, we will explain the case where the specific floor is the lowest floor. Figure 16 is a graph showing a third example of tension fluctuations in the two suspension bodies 7 due to movement of the car 8. In Figure 16, as in Figure 4, the tension fluctuations in the first suspension body are shown by a solid line, and the tension fluctuations in the second suspension body are shown by a dotted line.

[0141] In Figure 16, the tension values ​​for both the first and second suspension bodies at the bottom floor are outside the bottom floor tension allowable range. The bottom floor tension allowable range is a preset range centered around the target tension value. In this state, by measuring the tension at the bottom floor, the deviation from the target tension value, i.e., the tension adjustment values ​​dT1 and dT2, can be calculated.

[0142] Even when the number of suspension bodies 7 is three or more, the deviations of the specific floor tension values ​​of all suspension bodies 7 from the average value may be similarly determined as dT1, dT2, dT3, . . .

[0143] The first adjustment amounts Scar1 and Scar2 and the second adjustment amounts Scwt1 and Scwt2 can be calculated by the following equations.

[0144] Scar1=-C×dT1 / Keqvcar

[0145] Scar2=+C×dT2 / Keqvcar

[0146] Scwt1=-C×dT1 / Keqvcwt

[0147] Scwt2=+C×dT2 / Keqvcwt

[0148] Fig. 17 is a graph showing an example of tension fluctuations after tension adjustment of the two suspension bodies 7 in Fig. 16. In Fig. 17, the tension values ​​at the lowest floor for both the first suspension body and the second suspension body are within the lowest floor tension allowable range.

[0149] 18 is a process diagram showing the flow of tension adjustment work in embodiment 6. When tension adjustment work is started, in step S401, the car 8 is moved to a specific floor, in this example, the lowest floor. Then, in step S402, the tension in each suspension body 7 is measured as the specific floor tension value.

[0150] Thereafter, in step S403, target tension values ​​are calculated from the specific floor tension values ​​of all suspension bodies 7. Then, in step S404, a tension tolerance range is set based on the target tension values.

[0151] Next, in step S405, it is determined whether the specific floor tension value of each suspension body 7 is within the tension tolerance range. If the specific floor tension values ​​of all suspension bodies 7 are within the tension tolerance range, the work for that round is completed.

[0152] If there is a suspension body 7 whose specific floor tension value is not within the tension tolerance range, one or more suspension bodies 7 for which tension should be adjusted are selected in step S406. Next, in step S407, a first adjustment amount to be applied to the first cleat device 21 corresponding to the selected suspension body 7 is calculated. The second adjustment amount is determined in the same manner as in embodiment 1 or 2.

[0153] Thereafter, in step S408, it is confirmed whether there is an adjustment margin for the cleat device to be adjusted, either the first cleat device 21 or the second cleat device 22. In other words, it is confirmed whether the pair of nuts 28 can be screwed into the male thread portion of the shackle rod 24 by the required amount.

[0154] If necessary adjustment margin remains, adjustment work is performed on the first cleat device 21 and the second cleat device 22, or adjustment work is performed on the first cleat device 21 only, in step S409.

[0155] If there is no remaining necessary adjustment margin, the suspension body 7 is trimmed in step S410.

[0156] After the process of step S409 and the process of step S410, a reciprocating running process is carried out in step S411 in which the car 8 is caused to run reciprocatingly. This stabilizes the tension of each suspension body 7.

[0157] After the reciprocating running process, the process returns to step S401. The above process is performed until the specific floor tension values ​​of all suspension bodies 7 fall within the tension tolerance range, but because the first adjustment amount is uniquely determined, the number of repetitions is zero or significantly reduced. Therefore, the overall adjustment process can be labor-saving.

[0158] Here, in the sixth embodiment, the number of times the car 8 travels back and forth in the reciprocating travel process is determined based on the ascending and descending stroke of the car 8 and the number of pulleys around which the suspension body 7 is wound.

[0159] This eliminates the need to perform unnecessary round trips and shortens the maintenance work time. Also, checking the tension of each suspension body 7 after tension adjustment when the tension is unstable is suppressed, allowing the tension after adjustment to be checked more accurately.

[0160] When tension adjustment is performed only on the car 8 side, a slight slippage of the suspension body 7 on the drive sheave 5 is required to transmit the tension adjustment amount applied on the car 8 side to the counterweight 9 side. The slight slippage corresponds to creep that occurs due to the difference in tension between the car 8 side and the counterweight 9 side.

[0161] Because the minute slippage is a small value, a certain distance is required for the tension adjustment amount on the car 8 side to be transmitted to the counterweight 9 side and for the tension to reach a stable state. Therefore, particularly in elevators with short travel lengths, the car 8 needs to make multiple round trips after the tension adjustment.

[0162] On the other hand, in an elevator with a long travel, a stable tension state can be achieved by running the car 8 back and forth only once after adjusting the tension.

[0163] In a 2:1 roping elevator, which has pulleys other than the drive sheave 5, slight slippage also occurs in each pulley. Therefore, the first adjustment amount given to the first cleat device 21 is transmitted to the end of the counterweight-side suspension body via slight slippages in multiple pulleys, making it difficult to achieve a stable tension state compared to a 1:1 roping elevator.

[0164] Therefore, under the same conditions of the ascending and descending stroke, the greater the number of pulleys, the greater the number of reciprocating runs required to achieve a stable tension state.

[0165] In this way, the number of times the car 8 travels back and forth until a stable tension state is achieved after tension adjustment depends on the elevation stroke and the number of pulleys. Therefore, the number of times the car 8 travels back and forth necessary to achieve a stable tension state can be determined by applying a tension adjustment amount to each suspension body 7 in the analytical model and performing an analysis in which the car is run.

[0166] Specifically, by conducting an analysis in advance with different lifting and lowering strokes and different numbers of pulleys, the number of round trips required for the car 8 can be organized in advance in a table determined by the combination of lifting and lowering strokes and number of pulleys.

[0167] When tension adjustment is performed on both the car 8 side and the counterweight 9 side, the required number of round trips of the car 8 differs from when tension adjustment is performed on only one side. However, even in this case, the required number of round trips of the car 8 can be managed based on analysis in a table that determines the combination of the lifting stroke and the number of pulleys.

[0168] Also, instead of analysis, the above table can be created based on the results of actual machine tests under various conditions.

[0169] The specific floor in the sixth embodiment may be a floor other than the lowest or highest floor. When a floor other than the lowest or highest floor is set as the specific floor, the specific floor tension value is determined by averaging the car ascending tension value and the car descending tension value measured at the specific floor.

[0170] Furthermore, in the first to sixth embodiments, the first end 7a and the second end 7b of the suspension body 7 may be reversed. That is, the counterweight 9 may be connected to the first end 7a via the first cleat device 21, and the car 8 may be connected to the second end 7b via the second cleat device 22. In this case, the tension may be adjusted only on the counterweight 9 side.

[0171] The above describes in detail preferred embodiments, but the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0172] Various aspects of the present disclosure are summarized below as appendices.

[0173] (Appendix 1) an adjustment amount determination step for determining a first adjustment amount to be applied to a first cleat device connected to a first end of a suspension body that suspends the car and the counterweight; and a cleat adjusting step of adjusting the first cleat device according to the first adjustment amount; Including, When the portion from the first end of the suspension body to the drive sheave when the car and the counterweight are positioned at the same height is defined as a first portion, An elevator tension adjustment method in which, in the adjustment amount determination step, the first adjustment amount is determined from a value proportional to a tension adjustment value, which is the difference between the pre-adjustment tension value and the target tension value in the suspension body, divided by an equivalent spring constant when the first part and the cleat spring of the first cleat device are considered to be springs in series. (Appendix 2) In the adjustment amount determination step, a second adjustment amount to be applied to a second cleat device connected to a second end of the suspension body is determined to be the same value as the first adjustment amount, The elevator tension adjustment method described in Appendix 1, wherein the cleat adjustment process also adjusts the second cleat device according to the second adjustment amount. (Appendix 3) In the cleat adjusting step, a second cleat device connected to a second end of the suspension body is not adjusted, The elevator tension adjustment method described in Appendix 1, wherein in the adjustment amount determination process, the first adjustment amount is determined to be twice the value of the first adjustment amount when both the first cleat device and the second cleat device are adjusted in the cleat adjustment process. (Appendix 4) An elevator tension adjustment method according to any one of appendices 1 to 3, wherein the pre-adjustment tension value is the maximum value of the tension fluctuation of the suspension body due to movement of the car. (Appendix 5) 5. The elevator tension adjustment method according to claim 4, wherein the tension value of the suspension body measured during only a portion of the elevator car's ascent and descent stroke is input into a tension analysis model to determine the tension fluctuation of the suspension body throughout the entire elevator car's ascent and descent stroke. (Appendix 6) 4. The elevator tension adjustment method according to any one of claims 1 to 3, wherein the pre-adjustment tension value is the larger of the tension value of the suspension body measured when the car is located at the lowest floor and the tension value of the suspension body measured when the car is located at the highest floor. (Appendix 7) When the average tension value is the average of the ascending tension value, which is the tension value of the suspension body measured at an intermediate floor when the car is raised from the lowest floor, and the descending tension value, which is the tension value of the suspension body measured at an intermediate floor when the car is lowered from the top floor, the target tension value is an average value of the average tension values ​​of all the suspension bodies, An elevator tension adjustment method described in any one of Appendix 1 to Appendix 3, wherein the pre-adjustment tension value is the average tension value in each of the suspension bodies. (Appendix 8) When the tension value of the suspension body when the car is located at an arbitrary position is set to a specific floor tension value, the target tension value is an average value of the specific floor tension values ​​of all the suspension bodies, An elevator tension adjustment method described in any one of Appendix 1 to Appendix 3, wherein the pre-adjustment tension value is the specific floor tension value for each of the suspension bodies. (Appendix 9) 9. The elevator tension adjustment method according to any one of claims 1 to 8, wherein the first adjustment amount in an elevator using a 2:1 roping system is set to twice the first adjustment amount in an elevator using a 1:1 roping system. (Appendix 10) a reciprocating running step of stabilizing the tension of the suspension body by running the car back and forth after the cleat adjusting step; further comprising 10. The elevator tension adjustment method according to any one of claims 1 to 9, wherein the number of times the car makes reciprocating movements during the reciprocating movement process is determined based on the ascending and descending stroke of the car and the number of pulleys around which the suspension body is wound. [Explanation of symbols]

[0174] 5 drive sheave (pulley), 7 suspension body, 7a first end, 7b second end, 8 cage, 8a cage hoisting wheel (pulley), 9 counterweight, 9a counterweight hoisting wheel (pulley), 21 first cleat device, 22 second cleat device, 25 cleat spring.

Claims

1. an adjustment amount determination step for determining a first adjustment amount to be applied to a first cleat device connected to a first end of a suspension body that suspends the car and the counterweight; and a cleat adjusting step of adjusting the first cleat device according to the first adjustment amount; Including, When the portion from the first end of the suspension body to the drive sheave when the car and the counterweight are positioned at the same height is defined as a first portion, In the adjustment amount determination step, the first adjustment amount is determined from a value proportional to a tension adjustment value, which is the difference between the pre-adjustment tension value and the target tension value in the suspension body, divided by an equivalent spring constant when the first part and the cleat spring of the first cleat device are considered to be springs in series.

2. In the adjustment amount determination step, a second adjustment amount to be applied to a second cleat device connected to a second end of the suspension body is determined to be the same value as the first adjustment amount; 2. The elevator tension adjusting method according to claim 1, wherein the second cleat device is also adjusted in accordance with the second adjustment amount in the cleat adjusting step.

3. In the cleat adjusting step, a second cleat device connected to a second end of the suspension body is not adjusted, 2. The elevator tension adjustment method according to claim 1, wherein in the adjustment amount determination step, the first adjustment amount is determined to be twice the value of the first adjustment amount when both the first cleat device and the second cleat device are adjusted in the cleat adjustment step.

4. 4. The elevator tension adjusting method according to claim 1, wherein the pre-adjustment tension value is a maximum value in tension fluctuations of the suspension body due to movement of the car.

5. 5. The elevator tension adjustment method according to claim 4, wherein the tension value of the suspension body measured during only a portion of the ascent and descent stroke of the car is input into a tension analysis model to determine the tension fluctuation of the suspension body throughout the entire ascent and descent stroke.

6. 4. The elevator tension adjustment method according to claim 1, wherein the pre-adjustment tension value is the larger of a tension value of the suspension body measured when the car is located at the lowest floor and a tension value of the suspension body measured when the car is located at the highest floor.

7. When the average tension value is the average of the ascending tension value, which is the tension value of the suspension body measured at an intermediate floor when the car is raised from the lowest floor, and the descending tension value, which is the tension value of the suspension body measured at an intermediate floor when the car is lowered from the top floor, the target tension value is an average value of the average tension values ​​of all the suspension bodies, 4. The elevator tension adjusting method according to claim 1, wherein the pre-adjustment tension value is the average tension value in each of the suspension bodies.

8. When the tension value of the suspension body when the car is located at an arbitrary position is set to a specific floor tension value, the target tension value is an average value of the specific floor tension values ​​of all the suspension bodies, 4. The elevator tension adjustment method according to claim 1, wherein the pre-adjustment tension value is the specific floor tension value for each of the suspension bodies.

9. 4. The elevator tension adjusting method according to claim 1, wherein the first adjustment amount in an elevator using a 2:1 roping system is set to twice the first adjustment amount in an elevator using a 1:1 roping system.

10. a reciprocating running step of stabilizing the tension of the suspension body by running the car back and forth after the cleat adjusting step; further comprising 4. The elevator tension adjustment method according to claim 1, wherein the number of times the car makes reciprocating movements during the reciprocating movement process is determined based on the ascending and descending stroke of the car and the number of pulleys around which the suspension body is wound.

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