Elevator sheave and elevator rope winding method

Abstract

Provided are an elevator sheave and a rope winding method, which can prevent the wear amount of the sheave from being easily deviated. A driving sheave (9) as a sheave of an elevator (1) is a sheave with a plurality of main ropes (5) wound around its outer periphery. The driving sheave (9) is provided with first sheave grooves (10a) of a first depth, the same number as the plurality of main ropes (5). The driving sheave (9) is provided with second sheave grooves (10b) of a second depth, which is deeper than the first depth.

Description

Technical Field

[0001] The present invention relates to a sheave of an elevator and a method for winding a rope of an elevator. Background Art

[0002] Patent Document 1 discloses an example of a method for replacing a rope of an elevator. In this replacement method, one of a plurality of existing ropes is transferred to an extra sheave groove of a sheave. Thereafter, the newly installed rope is wound around an empty sheave groove of the sheave. After the other existing ropes are replaced with the newly installed rope, the existing rope transferred to the extra sheave groove is removed.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2-13588 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, in the elevator to which the replacement method of Patent Document 1 is applied, the number of sheave grooves used during the operation of the elevator is the same as the number of ropes. Here, in the wear of the sheave grooves caused by the operation of the elevator, a deviation may occur between each combination of the rope and the sheave groove due to the imbalance of the rope tension, etc. In the sheave of the elevator of Patent Document 1, the same number of sheave grooves as the ropes are used, so in order to make the deviation of the wear of each sheave groove uniform, it is necessary to replace the sheave or re-groove, etc., which increases the burden of maintenance.

[0008] The present disclosure relates to solving such problems. The present disclosure provides a sheave and a rope winding method for an elevator that can reduce the amount of wear of the sheave to be uneven.

[0009] Means for solving problems

[0010] The rope of the elevator disclosed in the present invention is wound around a plurality of ropes, wherein the outer circumference of the sheave is provided with first sheave grooves of a first depth, the same number as the plurality of ropes, and the outer circumference of the sheave is provided with second sheave grooves of a second depth deeper than the first depth.

[0011] The rope winding method of the elevator disclosed in the present invention comprises: a measuring step of measuring the depth of each of a plurality of sheave grooves in a sheave, wherein the sheave is provided with a plurality of sheave grooves on the periphery of the plurality of ropes to be wound, the plurality of sheave grooves being greater in number than the plurality of ropes; a selecting step of selecting the same number of sheave grooves as the number of the plurality of ropes to be wound around in order from shallow to deep the depths measured in the measuring step; and a setting step of setting the sheave grooves so that one of the plurality of ropes is wound around each of the rope grooves selected in the selecting step.

[0012] Effects of the Invention

[0013] According to the elevator sheave or rope winding method disclosed in the present invention, it is possible to reduce the amount of wear of the sheave to be uneven. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a block diagram of an elevator according to Embodiment 1.

[0015] Figure 2 This is an enlarged view of a main part of the drive sheave according to the first embodiment.

[0016] Figure 3 This is a diagram showing an example of the relationship between the wear of the drive sheave and the use period in the first embodiment.

[0017] Figure 4 This is an enlarged view of a main part of the drive sheave according to the first embodiment.

[0018] Figure 5 This is an enlarged view of a main part of the drive sheave according to the first embodiment. DETAILED DESCRIPTION

[0019] The embodiment of the present disclosure will be described with reference to the accompanying drawings. In each of the drawings, the same reference numerals are given to the same or corresponding parts, and repeated descriptions are appropriately simplified or omitted.

[0020] Implementation method 1.

[0021] Figure 1 This is a block diagram of the elevator 1 according to the first embodiment.

[0022] The elevator 1 is used, for example, in a building having multiple floors. In the building, a shaft 2 of the elevator 1 is installed. The shaft 2 is a vertically long space spanning multiple floors. The elevator 1 includes a traction machine 3, a deflector pulley 4, a plurality of main ropes 5, a car 6, and a counterweight 7.

[0023] The traction machine 3 is arranged, for example, at the upper part or the lower part of the hoistway 2, etc. When a machine room is provided above the hoistway 2, the traction machine 3 can also be arranged in the machine room. The traction machine 3 includes a motor 8 and a drive sheave 9. The motor 8 is a device that generates driving force. The drive sheave 9 is a sheave that rotates by the driving force generated by the motor 8. The drive sheave 9 is an example of the sheave of the elevator 1. The deflector sheave 4 is arranged close to the drive sheave 9. The deflector sheave 4 is another example of the sheave of the elevator 1.

[0024] Each main rope 5 is wound around the outer periphery of the drive sheave 9 and the outer periphery of the deflector sheave 4. The multiple main ropes 5 support the load of the car 6 on one side of the drive sheave 9. The multiple main ropes 5 support the load of the counterweight 7 on the other side of the drive sheave 9. In addition, the rope winding method of supporting the loads of the car 6 and the counterweight 7 by the multiple main ropes 5 is not limited to Figure 1 the rope winding method shown. The main rope 5 is an example of the rope of the elevator 1.

[0025] The car 6 is a device that conveys the users of the elevator 1 between multiple floors by traveling vertically in the hoistway 2. The car 6 travels vertically in linkage with the multiple main ropes 5 that move as the drive sheave 9 rotates.

[0026] The counterweight 7 is a device that balances the loads applied to both sides of the drive sheave 9 with the car 6. The counterweight 7 travels in the opposite direction to the car 6 in linkage with the multiple main ropes 5 that move as the drive sheave 9 rotates.

[0027] Figure 2 is an enlarged view of the main part of the drive sheave 9 of the elevator 1 according to Embodiment 1.

[0028] In Figure 2 it, the cross-section of the outer periphery of the drive sheave 9 is shown.

[0029] A plurality of sheave grooves 10 are provided on the outer periphery of the drive sheave 9. The plurality of sheave grooves 10 are arranged parallel to each other. In this example, the shape of each sheave groove 10 is a U-shaped groove with an undercut. In addition, in the sheaves of the elevator 1 such as the drive sheave 9, the shape of each sheave groove 10 is not limited to Figure 2 the shape shown. The shape of each sheave groove 10 can be, for example, a U-shaped groove or a V-shaped groove, etc. In the drive sheave 9, the number of the plurality of sheave grooves 10 is more than the number of the main ropes 5. For example, when the number of the main ropes 5 is six, seven sheave grooves 10 are provided on the drive sheave 9. Here, the number of the main ropes 5 when compared with the number of the sheave grooves 10 can also be the total number (Japanese: 延べ本数). That is, for example, in the elevator 1 that uses one main rope 5 to wind around the drive sheave 9 twice in a full overlap (Japanese: フルラップ), the number of the sheave grooves 10 is more than twice the actual number of the main ropes 5.

[0030] Here, the sheave grooves 10 of the plurality of sheave grooves 10, which are the same in number as the total number of the main ropes 5, are referred to as first sheave grooves 10a. The depths of the first sheave grooves 10a are the same as each other in the initial state. The depth of the first sheave groove 10a in the initial state is referred to as the first depth. Here, the depth of the sheave groove 10 indicates the position of the inner end of the main rope 5 hung in the sheave groove 10 in the radial direction of the drive sheave 9. The depth of the sheave groove 10 is, for example, the distance in the radial direction of the drive sheave 9 from the outer side surface of the drive sheave 9 to the inner end of the main rope 5 hung in the sheave groove 10.

[0031] In addition, the sheave grooves 10 other than the first sheave groove 10a among the plurality of sheave grooves 10 are referred to as second sheave grooves 10b. In this example, one second sheave groove 10b is provided. In this example, the second sheave groove 10b is arranged on the outer side in the axial direction on the outer periphery of the sheave groove 10. In addition, the second sheave groove 10b may be arranged between the first sheave grooves 10a. The second sheave groove 10b may be arranged, for example, on the outer periphery of the sheave groove 10 at the center portion in the axial direction. The depth of the second sheave groove 10b in the initial state is referred to as the second depth. The second depth is deeper than the first depth. Here, in the elevator 1, since the sheave groove 10 and the main rope 5 are worn as the use period passes, the main rope 5 is planned to be replaced once or more times after a predetermined use period. In this example, the second depth is deeper than the first depth. It is the average wear amount of the sheave groove 10 on which the main rope 5 is hung until the first replacement plan of the main rope 5. For comparison, in Figure 2 In FIG. 1 , the groove shape of the first sheave groove 10a in the initial state is overlapped in the second sheave groove 10b by a dotted line.

[0032] Next, use Figure 3 An example of wear of the sheave groove 10 will be described.

[0033] Figure 3 This is a diagram showing an example of the relationship between the wear of the drive sheave 9 and the use period in the first embodiment.

[0034] Figure 3 The horizontal axis represents the usage period of the driving sheave 9. Figure 3 The vertical axis represents the wear amount of the sheave groove 10.

[0035] The use period is the period during which the elevator 1 is used from the start of operation. The use period corresponds to the operation time of the elevator 1, or the travel distance of the elevator car 6 of the elevator 1, etc. The wear amount of the sheave groove 10 is the change in the depth of the sheave groove 10 from the initial state. The longer the use period, the greater the wear amount of the sheave groove 10. The wear amount of each sheave groove 10 may vary between each sheave groove 10 due to the imbalance of the rope tension, etc., but the average wear amount, which is the average wear amount of the sheave groove 10, increases monotonically according to the use period. In this example, the average wear amount is proportional to the use period. The relationship between the average wear amount and the use period can be estimated based on, for example, past measurement values ​​of elevators 1 of the same model, etc. Therefore, the average wear amount during the period from the start of operation of the elevator 1 to the initial replacement plan can be estimated before the elevator 1 starts working.

[0036] Next, use Figure 4 and Figure 5 An example of a method of winding the main rope 5 will be described.

[0037] Figure 4 and Figure 5 This is an enlarged view of a main part of the drive sheave 9 according to the first embodiment.

[0038] exist Figure 4 and Figure 5 , a cross section of the outer periphery of the driving sheave 9 is shown. In this example, a winding method in the replacement operation of the main rope 5 is described. In the elevator 1 of this example, the number of main ropes 5 is six. Seven sheave grooves 10 are provided on the driving sheave 9. Six of the seven sheave grooves 10 are first sheave grooves 10a of the first depth. One of the seven sheave grooves 10 is a second sheave groove 10b of the second depth.

[0039] exist Figure 4 , the state of the driving sheave 9 when the elevator 1 starts working is shown. Six main ropes 5 are hung one each in the six first sheave grooves 10a. On the other hand, no main rope 5 is hung in the second sheave groove 10b. The elevator 1 uses the main ropes 5 and the driving sheave 9 in this state from the start of operation until the first replacement plan.

[0040] exist Figure 5 , the state of the driving sheave 9 at the time of the first replacement plan is shown. At this time, the replacement operation of the main rope 5 is performed. The winding method included in the replacement operation includes a measurement process, a selection process, and a setting process. The operator performing the replacement operation performs these processes in sequence.

[0041] In the measuring process, the operator measures the depth of each sheave groove 10 of the driving sheave 9. The operator measures the depth of the sheave groove 10 by, for example, measuring the size of each sheave groove 10. Alternatively, the operator may measure the radial distance of the driving sheave 9 from the outer side surface of the driving sheave 9 to the outer end of the main rope 5 hung in each sheave groove 10, and measure the depth of the sheave groove 10 based on the diameter of the main rope 5. The operator may also measure the depth of the sheave groove 10 by taking a mold of the portion of the sheave groove 10 where the main rope 5 is not hung. In addition, the sheave groove 10 where the main rope 5 is not wound is not worn, so the depth of the sheave groove 10 is known. In this case, the measurement of the depth of the sheave groove 10 may also be omitted. In addition, the operator may perform the measuring process after removing the plurality of main ropes 5 wound on the driving sheave 9.

[0042] Thereafter, in the selection process, the operator selects the sheave groove 10 in which the newly installed rope is to be wound from among the plurality of sheave grooves 10 formed by combining the first sheave groove 10a and the second sheave groove 10b of the driving sheave 9. In this example, the operator selects the sheave groove 10 in which the newly installed rope is to be wound from among the seven sheave grooves 10 of the driving sheave 9. The operator selects the sheave groove 10 in which the newly installed rope is to be wound in the order of depth from shallow to deep measured in the measuring process. The main ropes 5 are hung on the sheave grooves 10 one by one, so the operator selects six sheave grooves 10 which are the same number as the number of main ropes 5. For comparison, in Figure 5 In the figure, the groove shape of the first sheave groove 10a in the initial state is overlapped and shown in dotted lines in each sheave groove 10. In this example, the third sheave groove 10 from the left side of the figure is the deepest due to wear, so six sheave grooves 10 other than this sheave groove 10 are selected. Here, when the second sheave groove 10b is still the deepest sheave groove 10 at the time of the initial replacement plan, the sheave grooves 10 other than the deepest sheave groove 10 are selected in the selection process.

[0043] Thereafter, in the setting process, the operator winds one newly installed main rope 5 in each of the sheave grooves 10 selected in the selection process. The operation of winding the newly installed main rope 5 may be simultaneously performed on a plurality of newly installed main ropes 5. Through the setting process, a state is achieved in which one newly installed main rope 5 is wound in each of the sheave grooves 10 selected in the selection process.

[0044] In this way, the winding method of the main rope 5 is implemented. Six newly installed main ropes 5 are hung one each in the six sheave grooves 10 selected in the selection process. On the other hand, the main rope 5 is not hung in the third sheave groove 10 from the left side of the drawing which is not selected in the selection process. The elevator 1 is used with the main rope 5 and the drive sheave 9 in this state until the next replacement schedule.

[0045] In addition, the replacement operation of the main rope 5 is also performed in the same manner at the time of the next replacement plan. For example, at the time of the next replacement plan, the third sheave groove 10 from the left side of the drawing has not been worn since the time of the first replacement plan, so there is a possibility that the other sheave grooves 10 become the deepest due to wear. In this case, the sheave groove 10 other than the deepest sheave groove 10 is selected in the selection process. On the other hand, when the third sheave groove 10 from the left side of the drawing is still the deepest sheave groove 10 at the time of the next replacement plan, the sheave groove 10 other than the deepest sheave groove 10 is selected in the selection process.

[0046] In addition, the winding method of the first embodiment can be applied to operations other than the replacement of the main rope 5, such as rehanging the main rope 5. The winding method can also be applied to maintenance and inspection operations such as removing the installed main rope 5 once and rewinding the installed main rope 5. In addition, the winding method of the first embodiment can also be applied to winding the main rope 5 around a sheave such as the deflector pulley 4.

[0047] As described above, the drive sheave 9 of Embodiment 1 is a sheave having a plurality of main ropes 5 wound around the outer periphery. The drive sheave 9 is provided with first sheave grooves 10a of a first depth, which are the same number as the plurality of main ropes 5. The drive sheave 9 is provided with second sheave grooves 10b of a second depth, which is deeper than the first depth.

[0048] In addition, the winding method of the main rope 5 of the elevator 1 of the first embodiment includes a measuring step, a selecting step, and a setting step. The measuring step is a step of measuring the depth of each sheave groove 10 in the driving sheave 9 provided with a plurality of sheave grooves 10. The number of sheave grooves 10 of the driving sheave 9 is greater than the number of the plurality of ropes wound around the periphery. The selecting step is a step of selecting the same number of sheave grooves 10 as the number of the plurality of ropes wound around the plurality of main ropes 5 in order from shallow to deep measured depths in the measuring step. The setting step is a step of setting the state in which each of the sheave grooves 10 selected in the selecting step is wound with one of the plurality of main ropes 5.

[0049] According to such a structure, whenever the main rope 5 is wound around the drive sheave 9 by replacement or the like, the main rope 5 can be wound around the sheave groove 10 other than the sheave groove 10 with the most wear. Here, the wear amount of each sheave groove 10 may vary between each sheave groove 10 due to the imbalance of rope tension or the like. The variation of the wear amount of the sheave groove 10 may become a major cause of the vibration of the car 6 caused by the generation of rope surge. The variation of the wear amount of the sheave groove 10 may become a major cause of the shortened life of the rope. In addition, the variation of the wear amount of the sheave groove 10 increases the imbalance of rope tension. In contrast, since the main rope 5 can be wound around the sheave groove 10 other than the sheave groove 10 with the most wear, the wear amount of the sheave groove 10 is averaged and is less likely to vary. In addition, since the wear amount of the sheave groove 10 is less likely to vary, the frequency of operations such as replacement or regrooving of the drive sheave 9 is reduced, and the burden of maintenance is suppressed.

[0050] In addition, the second depth is deeper than the first depth by the average wear amount of the first sheave groove 10a until the first replacement schedule of the plurality of main ropes 5. Thus, after the main ropes 5 are wound at the first replacement schedule, the average wear amount of the sheave groove 10 around which the main ropes 5 are wound is closer to the average wear amount. Therefore, the deviation of the sheave groove 10 is less likely to occur.

[0051] Industrial Applicability

[0052] The rope sheave of the present disclosure can be applied to an elevator. The winding method of the present disclosure can be applied to a rope of an elevator.

[0053] Description of symbols

[0054] 1: elevator, 2: hoistway, 3: traction machine, 4: deflector pulley, 5: main rope, 6: car, 7: counterweight, 8: motor, 9: drive sheave, 10: sheave groove, 10a: first sheave groove, 10b: second sheave groove.

Claims

1. A sheave of an elevator, with a plurality of ropes wound around its outer circumference, wherein: The outer periphery of the sheave is provided with first sheave grooves of a first depth which are the same in number as the plurality of ropes. A second sheave groove having a second depth deeper than the first depth is pre-arranged on the outer circumference of the sheave. The second depth is deeper than the first depth by an average wear amount of the first sheave groove until the first replacement schedule of the plurality of ropes, the average wear amount being proportional to the use period.

2. A method for winding a rope of an elevator, comprising: a measuring step of measuring the depth of each of a plurality of sheave grooves in a sheave, wherein the sheave is provided with a plurality of sheave grooves on an outer periphery of a plurality of ropes to be wound around the plurality of ropes, the number of the plurality of sheave grooves being greater than the number of the plurality of ropes; A selecting step of selecting, in order of depths from shallow to deep measured in the measuring step, sheave grooves including both sheave grooves around which the plurality of ropes are wound and sheave grooves around which the plurality of ropes are not wound, the same number of sheave grooves as the number of ropes, other than the sheave grooves with the deepest depths around which the plurality of ropes are to be wound; as well as The step of installing is to install the sheave grooves selected in the step of selecting so that one of the plurality of ropes is wound around each of the sheave grooves.

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