CN117545705A - Method and device for measuring groove wear and sheave for elevator - Google Patents
Method and device for measuring groove wear and sheave for elevator Download PDFInfo
- Publication number
- CN117545705A CN117545705A CN202180099636.4A CN202180099636A CN117545705A CN 117545705 A CN117545705 A CN 117545705A CN 202180099636 A CN202180099636 A CN 202180099636A CN 117545705 A CN117545705 A CN 117545705A
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- Prior art keywords
- sensor
- hole
- measuring
- sheave
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 238000005259 measurement Methods 0.000 claims description 32
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 238000005299 abrasion Methods 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000000691 measurement method Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 description 12
- 238000006073 displacement reaction Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 239000000725 suspension Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
Abstract
Provided is a method for measuring the amount of wear of a groove (13) formed in a metallic drive sheave (6). The measuring method comprises the following steps: a first step of facing the sensor (21) to a reference surface which faces in a direction opposite to the direction in which the bottom surface (30) of the groove (13) faces; and a second step of measuring, after the first step, the distance between the bottom surface (30) and the reference surface, that is, the thickness of the metal, by means of the sensor (21). The measurement method may further include a third step of: after the second step, the drive sheave (6) is replaced when the thickness measured by the sensor (21) is smaller than a reference value.
Description
Technical Field
The present disclosure relates to methods and apparatus for determining the amount of wear of a groove. In addition, the present disclosure relates to a sheave for an elevator.
Background
Patent document 1 describes a device for inspecting a sheave of an elevator. The device described in patent document 1 includes a displacement sensor. The displacement sensor is disposed so as to face the rope wound around the sheave. The displacement of the surface of the rope is detected by a displacement sensor. Further, displacement of the surface of the sheave is detected by a displacement sensor.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 5-278975
Disclosure of Invention
Problems to be solved by the invention
In the device described in patent document 1, the displacement sensor is attached to the bracket through a cover. The bracket is a different component than the sheave. Therefore, the result detected by the displacement sensor includes the mounting error of the cover. The abrasion loss of the rope is included as an error in the abrasion loss of the groove measured by the displacement sensor. Therefore, the device described in patent document 1 has a problem of poor measurement accuracy.
The present disclosure has been made to solve the above-described problems. An object of the present disclosure is to provide a method capable of measuring the abrasion loss of a groove with high accuracy and an apparatus for measuring the abrasion loss of a groove with high accuracy. Another object of the present disclosure is to provide a sheave for an elevator for applying such a method and apparatus.
Means for solving the problems
The method for measuring the groove wear of the present disclosure is a method for measuring the amount of wear of the groove formed in the metal sheave. The measuring method comprises the following steps: a first step of facing the sensor to a reference surface facing a direction opposite to a direction in which the bottom surface of the groove faces; and a second step of measuring, after the first step, a distance between the bottom surface and the reference surface, that is, a thickness of the metal, using the sensor.
The measuring device of the present disclosure includes: a sensor having a measurement surface, the sensor being capable of measuring the thickness of a metal member by bringing the measurement surface into contact with the metal member; and a support member that supports the sensor. The support member is provided with: a base to which the sensor is fixed; a first fitting portion in the shape of a disk, which is provided on the base and protrudes from the surface of the base; and a disk-shaped second fitting portion provided on the base portion and protruding from the surface of the base portion, the second fitting portion having a center axis parallel to the center axis of the first fitting portion.
The elevator sheave of the present disclosure includes: an inner cylinder part fixed to the rotary shaft; an outer tube section having a plurality of grooves formed in an outer peripheral surface thereof for winding the rope; and a support portion provided in the inner tube portion and supporting the outer tube portion. The outer tube portion has holes for measurement so as to pass through between the plurality of grooves and the rotary shaft. The central axis of the hole is parallel to the rotation axis.
Effects of the invention
According to the present disclosure, the abrasion loss of the groove can be measured with high accuracy.
Drawings
Fig. 1 is a diagram showing an example of an elevator apparatus.
Fig. 2 is an enlarged view of the drive sheave.
Fig. 3 is a view showing a section A-A of fig. 2.
Fig. 4 is a diagram showing an example of the measuring device in embodiment 1.
Fig. 5 is a view of the measuring device shown in fig. 4 as seen from the direction B.
Fig. 6 is a view of the measuring device shown in fig. 4 as seen from the direction C.
Fig. 7 is a view showing a section E-E of fig. 2.
Fig. 8 is a diagram for explaining a method of measuring the abrasion loss of the groove.
Fig. 9 is a view of the sensor and the support member attached to the outer tube section as seen from the direction B.
Detailed Description
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Duplicate descriptions are appropriately simplified or omitted. In the drawings, like reference numerals designate like or corresponding parts throughout the several views.
Embodiment 1.
Fig. 1 is a diagram showing an example of an elevator apparatus. The elevator apparatus includes a car 1 and a counterweight 2. The car 1 moves up and down in the hoistway 3. The counterweight 2 moves up and down in the hoistway 3. The car 1 and the counterweight 2 are suspended from the hoistway 3 by ropes 4. The rope 4 is, for example, a wire rope.
The traction machine 5 drives the car 1. The hoisting machine 5 includes a drive sheave 6, a motor 7, and a brake device 8. The drive sheave 6 is made of metal. The rope 4 is wound around the drive sheave 6. The motor 7 generates a driving force for driving the driving sheave 6. The brake device 8 holds the drive sheave 6 stationary. Fig. 1 shows 2: an example of an elevator apparatus of the 1-roping type is provided. At 1: in the 1-roping elevator apparatus, the rope 4 is further wound around the deflector sheave. The drive sheave 6 and the deflector sheave are examples of sheaves for an elevator.
Fig. 2 is an enlarged view of the drive sheave 6. Fig. 3 is a view showing a section A-A of fig. 2. The drive sheave 6 includes an inner tube 10, an outer tube 11, and a support 12. The inner tube 10 is fixed to the rotary shaft 9. The rotation shaft 9 penetrates the inner tube 10. The rotation shaft 9 is rotated by the driving force of the motor 7. For example, the rotation shaft 9 is directly coupled to the output shaft of the motor 7. The inner tube 10 rotates together with the rotary shaft 9.
The inner tube 10 is disposed inside the outer tube 11. A plurality of grooves 13 for winding the rope 4 are formed in the outer circumferential surface of the outer tube 11. Fig. 3 shows an example in which 3 grooves 13 are formed in the outer tube 11 at equal intervals. The number of grooves 13 formed in the outer peripheral surface of the outer tube 11 may be any number. Fig. 3 shows an example in which one rope 4 is wound around each groove 13 formed in the outer peripheral surface of the outer tube 11. That is, in the example shown in fig. 3, the car 1 is suspended by three ropes 4. The rope 4 may not be wound around a part of the groove 13 formed in the outer tube 11.
The support portion 12 is provided in the inner tube portion 10, and extends radially from the inner tube portion 10. The support portion 12 connects the inner tube portion 10 and the outer tube portion 11. That is, the outer tube 11 is supported by the support 12. When the drive sheave 6 is manufactured by casting, the inner tube portion 10, the outer tube portion 11, and the support portion 12 are integrally formed.
The car 1 and the counterweight 2 are suspended by the ropes 4, so that a suspension load acts on the ropes 4. Friction is generated between the rope 4 and the groove 13 by the suspension load acting on the rope 4. As described above, the car 1 is moved by the rotation of the drive sheave 6. Thus, the groove 13 around which the rope 4 is wound wears slightly every time the car 1 moves. In the case where the car 1 is hoisted by the plurality of ropes 4, the speed of progress of wear differs according to each groove 13.
For example, at the beginning of installation of the elevator, the suspension load acting on the ropes 4 is adjusted to be the same in each rope 4. However, since there are individual differences in the elongation of the rope 4, the suspension load acting on the rope 4 varies with the passage of time. The extent of the wear of the groove 13 progresses in proportion to the magnitude of the suspension load acting on the rope 4. Therefore, the progress of wear of the groove 13 also varies.
If the wear variation occurring in the groove 13 is released, an excessive suspension load acts on only 1 rope 4. The wire material of the rope 4 is easily broken and easily slides compared with other ropes 4. Therefore, in order to maintain the elevator apparatus in an appropriate state, it is necessary to periodically measure and grasp the amount of wear of the groove 13.
A plurality of sets of through holes 14 and stepped holes 15 are formed in the outer tube portion 11 of the drive sheave 6 shown in fig. 2 and 3. The through hole 14 is a measurement hole used for measuring the wear amount of the groove 13. The plurality of through holes 14 are disposed around the rotation shaft 9. In the example shown in fig. 3, eight through holes 14 are formed at equal intervals around the rotation shaft 9. The number of through holes 14 formed in the outer tube 11 is not limited to 8.
The through hole 14 opens on the side surface 11a and the side surface 11b of the outer tube 11. The side surfaces 11a and 11b are surfaces perpendicular to the rotation axis 9, and face in opposite directions to each other. The central axis of the through hole 14 is parallel to the rotation shaft 9. The through-holes 14 are formed so as to pass between the rotary shaft 9 and the grooves 13.
The stepped holes 15 are arranged adjacent to the corresponding through holes 14. The stepped hole 15 includes a blind hole 15a open at the side face 11a and a screw hole 15b open at the bottom face of the blind hole 15a. The center axis of the screw hole 15b coincides with the center axis of the blind hole 15a.
Fig. 4 is a diagram showing an example of the measuring device 20 in embodiment 1. Fig. 5 is a view of the measuring device 20 shown in fig. 4 as seen from the direction B. Fig. 6 is a view of the measuring device 20 shown in fig. 4 viewed from the direction C. The measuring device 20 is a device for measuring the amount of wear of the groove 13 formed in the drive sheave 6. The amount of wear of grooves formed in other sheaves may be measured by the measuring device 20. The measuring device 20 includes a sensor 21, a cable 22, a display 23, and a support member 24.
The sensor 21 has a measurement surface 25. The sensor 21 emits ultrasonic waves from the measurement surface 25, for example. If the measurement surface 25 is in contact with the surface of the metal member, the ultrasonic waves from the measurement surface 25 propagate inside the metal member. The ultrasonic wave propagating through the metal member reaches the other surface of the metal member, and is reflected at the other surface. The sensor 21 can measure the distance between the surfaces, that is, the thickness of the metal member by detecting the reflected ultrasonic wave. The result of the measurement by the sensor 21 is displayed on the display 23.
The support member 24 supports the sensor 21. The support member 24 also has a function of positioning the sensor 21 when the measuring device 20 measures the wear amount of the groove 13. In the example shown in fig. 4 to 6, the support member 24 includes a base 26, a fitting portion 27, and a fitting portion 28.
The base 26 is plate-shaped. The sensor 21 is fixed to the base 26. If the sensor 21 is cylindrical as shown in fig. 4, the base 26 is arranged so as to be perpendicular to the sensor 21. The fitting portion 27 has a disk shape. The fitting portion 28 has a disk shape. The fitting portion 27 and the fitting portion 28 are provided on the base portion 26. The fitting portions 27 and 28 protrude from the surface 26a of the base 26. The center axis of the fitting portion 28 is arranged parallel to the center axis of the fitting portion 27.
In the example shown in fig. 4 to 6, a part of the sensor 21 protrudes from the fitting portion 27. The portion of the sensor 21, i.e. the protruding portion, is cylindrical in shape. The outer peripheral surface of the protruding portion is a measurement surface 25. As another example, a part of the outer peripheral surface of the protruding portion is the measurement surface 25. The central axis of the protruding portion is parallel to the central axis of the fitting portion 27. However, the central axis of the protruding portion does not coincide with the central axis of the fitting portion 27. The protruding portion is configured so that no step is formed between at least a portion of the measurement surface 25 and a portion of the outer peripheral surface of the fitting portion 27. In the example shown in fig. 6, the sensor 21 is fixed to the base 26 such that the lower end of the measurement surface 25 indicated by reference numeral D and the lower end of the outer peripheral surface of the fitting portion 27 are arranged in a straight line.
The support member 24 has a through hole 24a. The through hole 24a penetrates the base 26 and the fitting portion 28. The center axis of the through hole 24a coincides with the center axis of the fitting portion 28.
Next, a method of measuring the amount of wear of the groove 13 formed in the drive sheave 6 using the measuring device 20 will be described with reference to fig. 7 to 9.
Fig. 7 is a view showing a section E-E of fig. 2. Fig. 7 shows an example in which 3 grooves 13a to 13c are formed in the outer tube portion 11 of the drive sheave 6. The groove 13a is an example of an unworn groove. The groove 13b shows an example of a groove in which wear slightly progresses from the state of the groove 13 a. The groove 13c shows an example of a groove in which wear further progresses from the state of the groove 13 b.
In the example shown in the present embodiment, the abrasion loss of the groove 13 is obtained by measuring the distance between the bottom surface 30 of the groove 13 and a preset reference surface by the measuring device 20. The reference surface is a surface facing in a direction opposite to the direction in which the bottom surface 30 faces. That is, the distance between the bottom surface 30 and the reference surface is the thickness of the metal of the portion of the drive sheave 6. In the example shown in the present embodiment, the reference surface is formed inside the through hole 14. That is, in the example shown in the present embodiment, the portion of the inner peripheral surface of the through hole 14 facing in the direction opposite to the direction in which the bottom surface 30 faces is the reference surface.
When measuring the wear amount of the groove 13 using the measuring device 20, the elevator maintenance personnel first inserts the sensor 21 into the through hole 14, and places the sensor 21 in the through hole 14. Then, the maintenance person disposes the support member 24 such that the fitting portion 27 is fitted into the through hole 14 and the fitting portion 28 is fitted into the blind hole 15a of the stepped hole 15.
Fig. 8 is a diagram for explaining a method of measuring the abrasion loss of the groove 13. Fig. 8 corresponds to the E-E section of fig. 2. Hereinafter, the bottom surface of the groove 13a is denoted by reference numeral 30a. Similarly, the bottom surface of the groove 13b is denoted by reference numeral 30b. The bottom surface of the groove 13c is denoted by reference numeral 30c.
In the example shown in fig. 8, the support member 24 is configured such that the fitting portion 27 is fitted into the through hole 14 and the fitting portion 28 is fitted into the blind hole 15a. In this state, the measurement surface 25 of the sensor 21 faces the reference surface formed inside the through hole 14. More preferably, the measurement surface 25 of the sensor 21 is in contact with a reference surface formed inside the through hole 14. After the sensor 21 is placed in the state shown in fig. 8, the maintenance person fastens the bolt 31 passing through the through hole 24a to the screw hole 15b, thereby fixing the support member 24 to the outer tube 11. Fig. 9 is a view of the sensor 21 and the support member 24 attached to the outer tube 11 as seen from the direction B.
When the sensor 21 and the support member 24 are attached to the outer tube 11, the maintenance personnel measures the distance L1 between the bottom surface 30a and the reference surface, the distance L2 between the bottom surface 30b and the reference surface, and the distance L3 between the bottom surface 30c and the reference surface by the sensor 21. The result of the measurement by the sensor 21 is displayed on the display 23.
The maintenance personnel compares the measured distance L1, distance L2, and distance L3 with the reference value TH1, respectively. The reference value TH1 is set in advance. If at least one of the measured distance L1, distance L2, and distance L3 is smaller than the reference value TH1, the maintenance person determines that the drive sheave 6 needs to be replaced. In this case, the maintenance person replaces the drive sheave 6 with a new one on site or at a later date.
The maintenance personnel also obtains the difference between the maximum value and the minimum value of the measured distances (thicknesses of metals). The maintenance person compares the obtained difference with the reference value TH 2. The reference value TH2 is set in advance. If the obtained difference is greater than the reference value TH2, the maintenance person determines that the drive sheave 6 needs to be replaced.
The determination as to whether the drive sheave 6 needs to be replaced may be performed in an improper manner. In this case, the measurement device 20 may not include the display 23. The measurement device 20 may be provided with a storage device or a transmitter instead of the display 23. If the measuring device 20 includes a storage device, the result of the measurement by the sensor 21 is stored in the storage device. If the measuring device 20 is provided with a transmitter, the result of the measurement by the sensor 21 is transmitted to other devices registered in advance.
In the example shown in the present embodiment, the sensor 21 is disposed such that the measurement surface 25 faces a reference surface formed in the outer tube portion 11 of the drive sheave 6. Therefore, the mounting error of the sensor 21 can be converged to a minimum value, and the abrasion loss of the groove 13 can be measured with high accuracy. In addition, in the example shown in the present embodiment, the through hole 14 can be machined at the time of manufacturing the drive sheave 6, and therefore, the through hole 14 can be machined with extremely high accuracy.
Conventionally, when measuring the wear amount of the groove 13, the outer peripheral surface of the drive sheave 6 is sometimes set as a reference surface. Oil oozing from the rope 4 adheres to the outer peripheral surface of the drive sheave 6. Therefore, when the outer peripheral surface of the drive sheave 6 is set as a reference surface for measurement, the oil adhering to the outer peripheral surface must be removed.
In the example shown in the present embodiment, the reference surface to be measured is disposed closer to the rotation axis 9 than the groove 13. The reference surface faces in a direction opposite to the direction in which the bottom surface 30 of the groove 13 faces. Therefore, the oil oozing out from the rope 4 can be prevented from adhering to the reference surface.
In order to further prevent the oil oozing out of the rope 4 from adhering to the reference surface, the drive sheave 6 may further include a cover (not shown) for closing the through hole 14. The drive sheave 6 may be provided with a cover that closes both the through hole 14 and the stepped hole 15. In this case, normal operation is performed in the elevator in a state where the through hole 14 is blocked by the cover.
In the case of measuring the wear amount of the groove 13, a maintenance person fixes the support member 24 to the outer tube 11 after removing the cover from the outer tube 11. When the measurement of the wear amount of the groove 13 is completed, the maintenance personnel detach the sensor 21 and the support member 24 from the outer tube 11, and then attach the cover to the outer tube 11.
In the present embodiment, an example is described in which the fitting portion 27 of the support member 24 is fitted into the through hole 14 and the fitting portion 28 is fitted into the blind hole 15a in order to position the sensor 21. As another example, the measuring device 20 may further include means for pressing the measuring surface 25 of the sensor 21 against the reference surface of the outer tube 11 in the through hole 14. For example, an elastic member, a leaf spring, or the like may be used as the unit.
In this embodiment, an example in which a maintainer performs attachment and detachment of the measuring device 20 at the time of checking an elevator or the like is described. The measuring device 20 may be provided in the drive sheave 6. In this case, the measurement device 20 preferably includes a storage device or a transmitter instead of the display 23.
Industrial applicability
The measurement method of the present disclosure can be applied to measurement of the amount of wear of a groove formed in a metal sheave.
Description of the reference numerals
1: car, 2: counterweight, 3: well, 4: rope, 5: traction machine, 6: drive sheave, 7: motor, 8: braking device, 9: rotation axis, 10: inner tube portion, 11: outer tube portions 11a to 11b: side, 12: support part, 13: groove, 14: through hole, 15: stepped hole, 15a: blind hole, 15b: screw hole, 20: measurement device, 21: sensor, 22: cable, 23: display, 24: support member, 24a: through hole, 25: measurement surface, 26: base, 26a: surface, 27-28: fitting portion, 30: bottom surface, 31: and (5) a bolt.
Claims (8)
1. A method for measuring the amount of wear of a groove formed in a metal sheave, comprising:
a first step of facing a sensor to a reference surface facing a direction opposite to a direction in which a bottom surface of the groove faces; and
and a second step of measuring a distance between the bottom surface and the reference surface, that is, a thickness of the metal, using the sensor after the first step.
2. The method for measuring the amount of wear of a groove according to claim 1, wherein,
the method for measuring the abrasion loss of the groove further comprises the following third working procedures: after the second step, the sheave is replaced when the thickness measured by the sensor is smaller than a reference value.
3. The method for measuring the amount of wear of a groove according to claim 1 or 2, wherein,
the sensor is supported by a support member,
the rope wheel is provided with a hole for measurement,
the central axis of the hole is parallel to the rotation axis of the rope wheel,
the datum surface is formed on the inside of the hole,
in the first step, the support member is fixed to the sheave with the sensor disposed in the hole.
4. A measuring device is provided with:
a sensor having a measurement surface, the sensor being capable of measuring the thickness of a metal member by bringing the measurement surface into contact with the metal member; and
a support member that supports the sensor,
the support member includes:
a base to which the sensor is fixed;
a first fitting portion in the shape of a disk, which is provided on the base portion and protrudes from the surface of the base portion; and
and a disk-shaped second fitting portion provided on the base portion and protruding from the surface of the base portion, the second fitting portion having a center axis parallel to the center axis of the first fitting portion.
5. The measuring apparatus according to claim 4, wherein,
a through hole is formed in the support member so as to penetrate the base portion and the second fitting portion,
the support member is fixed to the metal member by a bolt penetrating the through hole.
6. A sheave for an elevator is provided with:
an inner cylinder part fixed to the rotary shaft;
an outer tube section having a plurality of grooves formed in an outer peripheral surface thereof for winding the rope; and
a support portion provided in the inner tube portion and supporting the outer tube portion,
holes for measurement are formed in the outer tube so as to pass between the plurality of grooves and the rotary shaft,
the central axis of the hole is parallel to the rotation axis.
7. The sheave for an elevator according to claim 6, wherein,
the outer tube portion is formed with a plurality of holes at equal intervals around the rotation axis.
8. The sheave for an elevator according to claim 6 or 7, wherein,
the elevator sheave further includes a cover for closing the hole.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2021/024009 WO2022269879A1 (en) | 2021-06-24 | 2021-06-24 | Method for measuring amount of wear of groove, measurement device, and elevator sheave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117545705A true CN117545705A (en) | 2024-02-09 |
Family
ID=84544404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180099636.4A Pending CN117545705A (en) | 2021-06-24 | 2021-06-24 | Method and device for measuring groove wear and sheave for elevator |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7347717B2 (en) |
| CN (1) | CN117545705A (en) |
| WO (1) | WO2022269879A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6653943B2 (en) * | 2001-07-12 | 2003-11-25 | Inventio Ag | Suspension rope wear detector |
| JP2006027762A (en) * | 2004-07-13 | 2006-02-02 | Mitsubishi Electric Corp | Sheave for elevator |
| JP5346864B2 (en) * | 2010-04-02 | 2013-11-20 | 株式会社日立ビルシステム | Elevator sheave wear diagnostic device |
| JP5200061B2 (en) * | 2010-05-27 | 2013-05-15 | 株式会社日立ビルシステム | Sheave groove wear amount measuring device |
| JP2013018643A (en) * | 2011-07-14 | 2013-01-31 | Toshiba Elevator Co Ltd | Diagnostic device of elevator |
-
2021
- 2021-06-24 WO PCT/JP2021/024009 patent/WO2022269879A1/en unknown
- 2021-06-24 CN CN202180099636.4A patent/CN117545705A/en active Pending
- 2021-06-24 JP JP2023529384A patent/JP7347717B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2022269879A1 (en) | 2022-12-29 |
| WO2022269879A1 (en) | 2022-12-29 |
| JP7347717B2 (en) | 2023-09-20 |
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