US20210362981A1 - Coated sheave - Google Patents
Coated sheave Download PDFInfo
- Publication number
- US20210362981A1 US20210362981A1 US17/395,881 US202117395881A US2021362981A1 US 20210362981 A1 US20210362981 A1 US 20210362981A1 US 202117395881 A US202117395881 A US 202117395881A US 2021362981 A1 US2021362981 A1 US 2021362981A1
- Authority
- US
- United States
- Prior art keywords
- sheave
- filler
- coating
- bearing assembly
- load bearing
- 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.)
- Abandoned
Links
- 239000000945 filler Substances 0.000 claims abstract description 42
- 238000000576 coating method Methods 0.000 claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 14
- 229920000642 polymer Polymers 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 9
- 229920002635 polyurethane Polymers 0.000 claims description 7
- 239000004814 polyurethane Substances 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- 239000000806 elastomer Substances 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 239000002861 polymer material Substances 0.000 claims description 2
- 239000004094 surface-active agent Substances 0.000 claims description 2
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 2
- 239000001993 wax Substances 0.000 description 23
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 231100000069 corrosive reaction Toxicity 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000011877 solvent mixture Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B15/00—Main component parts of mining-hoist winding devices
- B66B15/02—Rope or cable carriers
- B66B15/04—Friction sheaves; "Koepe" pulleys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/02—Guideways; Guides
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D191/00—Coating compositions based on oils, fats or waxes; Coating compositions based on derivatives thereof
- C09D191/06—Waxes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
Definitions
- Traction-based elevators generally include a load bearing assembly which is wrapped around sheaves and connected to a car for suspending and moving the elevator.
- the load bearing assembly may comprise one or more flat belts or round ropes.
- the flat belts are received on the sheave in a friction relationship, such that rotation of the sheave causes movement of the load bearing assembly and the car.
- sheaves are coated with various protective coating materials to improve their lifetimes. Known coatings, however, are still subject to corrosion.
- An elevator sheave includes a sheave body and a coating on a surface of the sheave body.
- the coating includes microcracks and a filler in the microcracks.
- the filler comprises a wax.
- the coating is a hard chrome coating.
- the hard chrome coating is plated onto the sheave.
- the elevator system includes the elevator sheave.
- the elevator system includes a load bearing assembly.
- the load bearing assembly is partially wrapped around the sheave.
- the load bearing assembly is in a friction relationship with the coating on the sheave.
- the filler is inert with respect to an external material of the load bearing assembly.
- the load bearing assembly includes a jacket.
- the jacket includes a polymer.
- the filler is inert to the polymer.
- the jacket includes at least one of a thermoplastic elastomer polymers, a thermosetting elastomer polymer, and a rubber polymer.
- the filler includes a material and the jacket comprises the material.
- the filler comprises a wax and the jacket includes the wax.
- the jacket includes polyurethane.
- the polyurethane includes wax additives.
- the filler includes at least one of the wax additives.
- a method of making a sheave for an elevator system includes applying a filler to a traction sheave.
- the filler infiltrates microcracks in the coating to at least partially fill the microcracks.
- the filler includes a wax.
- the applying is done in a vacuum environment.
- the filler is mixed with a solvent prior to applying the filler to the microcracks.
- the solvent is a surfactant.
- the coating is a hard chrome coating.
- the traction sheave is configured to receive a load bearing assembly.
- the filler is inert with respect to a jacket of the load bearing assembly.
- the jacket includes a polymer material including at least one wax component.
- the filler comprises the at least one component.
- FIG. 1 schematically illustrates selected portions of an elevator system including a load bearing assembly and sheave designed according to an embodiment of this invention.
- FIG. 2 schematically shows a load bearing assembly looped around a sheave of the elevator system of FIG. 1 .
- FIG. 3 schematically shows a cross-sectional detailed view of a portion of the sheave encircled at 3 in FIG. 2 .
- FIG. 4 schematically illustrates an example method of treating a sheave surface according to an embodiment of this invention.
- FIG. 5 schematically illustrates another example method of treating a sheave surface according to an embodiment of this invention.
- FIG. 1 schematically shows selected portions of an example elevator system 20 .
- An elevator car 22 and counterweight 24 are suspended by a load bearing assembly 26 .
- the load bearing assembly 26 comprises a plurality of flat belts.
- the load bearing assembly 26 comprises a plurality of round ropes.
- the load bearing assembly 26 supports the weight of the elevator car 22 and the counterweight 24 and facilitates movement of the elevator car 22 into desired positions by moving along sheaves 28 .
- one of the sheaves 28 is a traction sheave that is moved by an elevator machine in a known manner to cause the desired movement and placement of the elevator car 22 .
- the other sheave 28 is an idler sheave.
- FIG. 2 schematically shows an example sheave 28 .
- Traction between the load bearing assembly 26 and the sheave 28 allows for achieving the desired movement or placement of the elevator car 22 . That is, friction between the sheave 28 and the load bearing assembly 26 at the interface between them causes the load bearing assembly 26 to move with the sheave 28 when the sheave 28 is rotated. Damage to the sheave 28 surface, such as wear or corrosion, interferes with the friction relationship. Therefore, sheave 28 is coated with a wear-resistant coating 31 , as shown schematically in FIG. 3 .
- One example wear-resistant coating comprises a hard chrome.
- Hard chrome coatings are susceptible to corrosion.
- one cause of corrosion is microcracks 34 that form in the hard chrome coating 31 during the application of the coating 31 to the sheave 28 , such as by a plating process.
- Microcracks 34 act as initiation sites for corrosive reactions because they allow corrosive materials to enter the coating 32 and to eventually enter the base material of sheave 28 .
- Corrosion of the coating 32 interferes with the friction relationship between the sheave 28 and the load bearing assembly 26 , which interferes with the ability of the load bearing assembly 26 and the sheave 28 , and necessitates replacement of the sheave 28 .
- microcracks 34 are filled in with a noble, passive filler 33 , such as wax.
- the filler 33 prevents corrosive substances from entering the microcracks 34 and thus prevents or reduces corrosion of the sheave 28 .
- the filler 33 is inert with respect to the material of the load bearing assembly 26 .
- the load bearing assembly 26 has a thermoplastic jacket 27 on its exterior, and the thermoplastic jacket 27 contacts the sheave 28 .
- the jacket 27 comprises a thermoplastic or thermosetting elastomer polymer (such as polyurethane) or rubber polymer or mixtures and blends thereof. Because the filler 33 is inert with respect to the load bearing assembly 26 , it does not cause wear or breakdown of the load bearing assembly 26 and does not interfere with the friction relationship between the load bearing assembly 26 and the sheave 28 .
- the filler 33 is inert with respect to the load bearing assembly 26 because it comprises a material that the jacket 27 of the load bearing assembly 26 also includes.
- the filler 33 is a wax that infiltrates into the microcracks 32 .
- Example wax fillers 33 are paraffin wax, polyethylene wax, and mixtures thereof.
- the filler 33 is a wax which is the same type of wax that is a component of the jacket 27 of the load bearing assembly.
- polyurethanes contain wax additives and the wax filler 33 comprises at least one of the wax additives of the polyurethane used for the jacket 27 of the load bearing assembly 26 .
- FIG. 4 One example method of applying the wax filler 33 to the microcracks 32 is schematically shown in FIG. 4 .
- the wax is mixed with a surfactant-type solvent at 40 to reduce the surface energy and tension of liquid wax.
- the wax/solvent mixture is applied to the sheave 28 by any known method, such as spraying, dipping and brushing, etc.
- the solvent reduces the in surface energy and tension to ensure that the wax 33 penetrates into the microcracks 31 .
- Another example method of applying the wax filler 33 to the microcracks includes using a vacuum pump 42 for applying the wax filler 33 to the sheave 28 in a vacuum environment, as shown schematically in FIG. 5 .
- the vacuum environment draws air and contaminants out of the microcracks 32 , which allows the filler 33 to infiltrate the microcracks 32 .
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Metallurgy (AREA)
- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
- Ropes Or Cables (AREA)
Abstract
An elevator sheave includes a sheave body and a coating on a surface of the sheave body. The coating includes microcracks and a filler in the microcracks. A method of making a sheave for an elevator system is also disclosed.
Description
- This application is a continuation of U.S. patent application Ser. No. 15/971,211 filed May 4, 2018, which is herein incorporated by reference in its entirety.
- Traction-based elevators generally include a load bearing assembly which is wrapped around sheaves and connected to a car for suspending and moving the elevator. The load bearing assembly may comprise one or more flat belts or round ropes. The flat belts are received on the sheave in a friction relationship, such that rotation of the sheave causes movement of the load bearing assembly and the car.
- It is important to maintain traction between the sheave and the load bearing assembly to maintain desired operation of the elevator. The friction relationship can be reduced by damage (such as wear) to the sheave. To this end, sheaves are coated with various protective coating materials to improve their lifetimes. Known coatings, however, are still subject to corrosion.
- An elevator sheave according to an example of the present disclosure includes a sheave body and a coating on a surface of the sheave body. The coating includes microcracks and a filler in the microcracks.
- In a further embodiment according to any of the foregoing embodiments, the filler comprises a wax.
- In a further embodiment according to any of the foregoing embodiments, the coating is a hard chrome coating.
- In a further embodiment according to any of the foregoing embodiments, the hard chrome coating is plated onto the sheave.
- In a further embodiment according to any of the foregoing embodiments, the elevator system includes the elevator sheave.
- In a further embodiment according to any of the foregoing embodiments, the elevator system includes a load bearing assembly. The load bearing assembly is partially wrapped around the sheave. The load bearing assembly is in a friction relationship with the coating on the sheave.
- In a further embodiment according to any of the foregoing embodiments, the filler is inert with respect to an external material of the load bearing assembly.
- In a further embodiment according to any of the foregoing embodiments, the load bearing assembly includes a jacket. The jacket includes a polymer. The filler is inert to the polymer.
- In a further embodiment according to any of the foregoing embodiments, the jacket includes at least one of a thermoplastic elastomer polymers, a thermosetting elastomer polymer, and a rubber polymer.
- In a further embodiment according to any of the foregoing embodiments, the filler includes a material and the jacket comprises the material.
- In a further embodiment according to any of the foregoing embodiments, the filler comprises a wax and the jacket includes the wax.
- In a further embodiment according to any of the foregoing embodiments, the jacket includes polyurethane. The polyurethane includes wax additives. The filler includes at least one of the wax additives.
- A method of making a sheave for an elevator system according to an example of the present disclosure includes applying a filler to a traction sheave. The filler infiltrates microcracks in the coating to at least partially fill the microcracks.
- In a further embodiment according to any of the foregoing embodiments, the filler includes a wax.
- In a further embodiment according to any of the foregoing embodiments, the applying is done in a vacuum environment.
- In a further embodiment according to any of the foregoing embodiments, the filler is mixed with a solvent prior to applying the filler to the microcracks.
- In a further embodiment according to any of the foregoing embodiments, the solvent is a surfactant.
- In a further embodiment according to any of the foregoing embodiments, the coating is a hard chrome coating.
- In a further embodiment according to any of the foregoing embodiments, the traction sheave is configured to receive a load bearing assembly. The filler is inert with respect to a jacket of the load bearing assembly.
- In a further embodiment according to any of the foregoing embodiments, the jacket includes a polymer material including at least one wax component. The filler comprises the at least one component.
-
FIG. 1 schematically illustrates selected portions of an elevator system including a load bearing assembly and sheave designed according to an embodiment of this invention. -
FIG. 2 schematically shows a load bearing assembly looped around a sheave of the elevator system ofFIG. 1 . -
FIG. 3 schematically shows a cross-sectional detailed view of a portion of the sheave encircled at 3 inFIG. 2 . -
FIG. 4 schematically illustrates an example method of treating a sheave surface according to an embodiment of this invention. -
FIG. 5 schematically illustrates another example method of treating a sheave surface according to an embodiment of this invention. -
FIG. 1 schematically shows selected portions of anexample elevator system 20. Anelevator car 22 andcounterweight 24 are suspended by aload bearing assembly 26. In one example, theload bearing assembly 26 comprises a plurality of flat belts. In another example, theload bearing assembly 26 comprises a plurality of round ropes. - The
load bearing assembly 26 supports the weight of theelevator car 22 and thecounterweight 24 and facilitates movement of theelevator car 22 into desired positions by moving alongsheaves 28. In this example, one of thesheaves 28 is a traction sheave that is moved by an elevator machine in a known manner to cause the desired movement and placement of theelevator car 22. Theother sheave 28 is an idler sheave. -
FIG. 2 schematically shows anexample sheave 28. Traction between theload bearing assembly 26 and thesheave 28 allows for achieving the desired movement or placement of theelevator car 22. That is, friction between thesheave 28 and theload bearing assembly 26 at the interface between them causes theload bearing assembly 26 to move with thesheave 28 when thesheave 28 is rotated. Damage to thesheave 28 surface, such as wear or corrosion, interferes with the friction relationship. Therefore,sheave 28 is coated with a wear-resistant coating 31, as shown schematically inFIG. 3 . - One example wear-resistant coating comprises a hard chrome. Hard chrome coatings are susceptible to corrosion. With continued reference to
FIG. 3 , one cause of corrosion ismicrocracks 34 that form in thehard chrome coating 31 during the application of thecoating 31 to thesheave 28, such as by a plating process. Microcracks 34 act as initiation sites for corrosive reactions because they allow corrosive materials to enter the coating 32 and to eventually enter the base material ofsheave 28. Corrosion of the coating 32 interferes with the friction relationship between thesheave 28 and theload bearing assembly 26, which interferes with the ability of theload bearing assembly 26 and thesheave 28, and necessitates replacement of thesheave 28. - In the illustrated example,
microcracks 34 are filled in with a noble,passive filler 33, such as wax. Thefiller 33 prevents corrosive substances from entering themicrocracks 34 and thus prevents or reduces corrosion of thesheave 28. - The
filler 33 is inert with respect to the material of theload bearing assembly 26. In one example, theload bearing assembly 26 has athermoplastic jacket 27 on its exterior, and thethermoplastic jacket 27 contacts thesheave 28. In a particular example, thejacket 27 comprises a thermoplastic or thermosetting elastomer polymer (such as polyurethane) or rubber polymer or mixtures and blends thereof. Because thefiller 33 is inert with respect to theload bearing assembly 26, it does not cause wear or breakdown of theload bearing assembly 26 and does not interfere with the friction relationship between theload bearing assembly 26 and thesheave 28. - In a particular example, the
filler 33 is inert with respect to theload bearing assembly 26 because it comprises a material that thejacket 27 of theload bearing assembly 26 also includes. - In one example, the
filler 33 is a wax that infiltrates into the microcracks 32.Example wax fillers 33 are paraffin wax, polyethylene wax, and mixtures thereof. In a particular example, thefiller 33 is a wax which is the same type of wax that is a component of thejacket 27 of the load bearing assembly. For example, polyurethanes contain wax additives and thewax filler 33 comprises at least one of the wax additives of the polyurethane used for thejacket 27 of theload bearing assembly 26. - One example method of applying the
wax filler 33 to the microcracks 32 is schematically shown inFIG. 4 . In this example, the wax is mixed with a surfactant-type solvent at 40 to reduce the surface energy and tension of liquid wax. The wax/solvent mixture is applied to thesheave 28 by any known method, such as spraying, dipping and brushing, etc. The solvent reduces the in surface energy and tension to ensure that thewax 33 penetrates into themicrocracks 31. - Another example method of applying the
wax filler 33 to the microcracks includes using avacuum pump 42 for applying thewax filler 33 to thesheave 28 in a vacuum environment, as shown schematically inFIG. 5 . The vacuum environment draws air and contaminants out of the microcracks 32, which allows thefiller 33 to infiltrate the microcracks 32. - The preceding description is exemplary rather than limiting in nature. Variations and modifications to the disclosed examples may become apparent to those skilled in the art that do not necessarily depart from the essence of this invention. The scope of legal protection given to this invention can only be determined by studying the following claims.
Claims (20)
1. An elevator sheave, comprising:
a sheave body;
a coating on a surface of the sheave body, the coating including microcracks; and
a filler in the microcracks.
2. The elevator sheave of claim 1 , wherein the filler comprises a wax.
3. The elevator sheave of claim 1 , wherein the coating is a hard chrome coating.
4. The elevator sheave of claim 3 , wherein the hard chrome coating is plated onto the sheave.
5. An elevator system comprising the elevator sheave of claim 1 .
6. The elevator system of claim 5 , comprising a load bearing assembly at least partially wrapped around the sheave such that the load bearing assembly is in a friction relationship with the coating on the sheave.
7. The elevator system of claim 6 , wherein the filler is inert with respect to an external material of the load bearing assembly.
8. The elevator system of claim 6 , wherein the load bearing assembly includes a jacket;
the jacket comprises a polymer; and
the filler is inert to the polymer.
9. The elevator system of claim 8 , wherein the jacket comprises at least one of a thermoplastic elastomer polymer, a thermosetting elastomer polymer, and a rubber polymer.
10. The elevator system of claim 8 , wherein the filler comprises a material and the jacket comprises the material.
11. The elevator system of claim 10 , wherein the filler comprises a wax and the jacket includes the wax.
12. The elevator system of claim 11 , wherein:
the jacket comprises a polyurethane;
The polyurethane comprises wax additives; and
the filler comprises at least one of the wax additives.
13. A method of making a sheave for an elevator system, the method comprising:
applying a filler to a traction sheave having a coating such that the filler infiltrates microcracks in the coating to at least partially fill the microcracks.
14. The method of claim 13 , wherein the filler comprises a wax.
15. The method of claim 13 , wherein the applying is done in a vacuum environment.
16. The method of claim 13 , comprising mixing the filler with a solvent prior to applying the filler to the microcracks.
17. The method of claim 16 , wherein the solvent is a surfactant.
18. The method of claim 13 , wherein the coating is a hard chrome coating.
19. The method of claim 13 , wherein the traction sheave is configured to receive a load bearing assembly, and the filler is inert with respect to a jacket of the load bearing assembly.
20. The method of claim 19 , wherein:
the jacket comprises a polymer material including at least one wax component; and
the filler comprises the at least one component.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/395,881 US20210362981A1 (en) | 2018-05-04 | 2021-08-06 | Coated sheave |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/971,211 US11111108B2 (en) | 2018-05-04 | 2018-05-04 | Coated sheave |
US17/395,881 US20210362981A1 (en) | 2018-05-04 | 2021-08-06 | Coated sheave |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/971,211 Continuation US11111108B2 (en) | 2018-05-04 | 2018-05-04 | Coated sheave |
Publications (1)
Publication Number | Publication Date |
---|---|
US20210362981A1 true US20210362981A1 (en) | 2021-11-25 |
Family
ID=66397161
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US15/971,211 Active 2039-09-03 US11111108B2 (en) | 2018-05-04 | 2018-05-04 | Coated sheave |
US17/395,881 Abandoned US20210362981A1 (en) | 2018-05-04 | 2021-08-06 | Coated sheave |
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US15/971,211 Active 2039-09-03 US11111108B2 (en) | 2018-05-04 | 2018-05-04 | Coated sheave |
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EP (1) | EP3564180B1 (en) |
CN (1) | CN110436306B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US11111108B2 (en) * | 2018-05-04 | 2021-09-07 | Otis Elevator Company | Coated sheave |
US20230204091A1 (en) * | 2020-05-21 | 2023-06-29 | Sherman + Reilly, Inc. | Additive-coated sheave, method of manufacturing the same, and methods of reducing sound produced by equipment |
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Also Published As
Publication number | Publication date |
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EP3564180A1 (en) | 2019-11-06 |
US11111108B2 (en) | 2021-09-07 |
EP3564180B1 (en) | 2022-06-29 |
US20190337770A1 (en) | 2019-11-07 |
CN110436306A (en) | 2019-11-12 |
CN110436306B (en) | 2021-08-13 |
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