US20150336746A1 - Cantilevered screw assembly - Google Patents
Cantilevered screw assembly Download PDFInfo
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- US20150336746A1 US20150336746A1 US14/818,751 US201514818751A US2015336746A1 US 20150336746 A1 US20150336746 A1 US 20150336746A1 US 201514818751 A US201514818751 A US 201514818751A US 2015336746 A1 US2015336746 A1 US 2015336746A1
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- Prior art keywords
- screw
- wall
- assembly
- bearing
- screw assembly
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G33/00—Screw or rotary spiral conveyors
- B65G33/24—Details
- B65G33/32—Adaptations of bearings or couplings for supporting and connecting screws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G33/00—Screw or rotary spiral conveyors
- B65G33/24—Details
- B65G33/26—Screws
- B65G33/265—Screws with a continuous helical surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G45/00—Lubricating, cleaning, or clearing devices
- B65G45/02—Lubricating devices
Definitions
- Exemplary embodiments of the present invention relate generally to a cantilevered screw assembly.
- cantilevered screw assemblies may include, but are not limited to, augers, compactors, crushers, shredders, feeders, material handlers, bale breakers, briquetters, and autoclave sterilizers. Other applications of cantilevered screw assemblies are also possible.
- Known cantilevered screw assemblies have used grease-lubricated bearings. Such systems may provide a reservoir of grease that is supplied to the bearings. While effective, the reservoir of grease needs to be periodically refilled, which increases the necessary maintenance of the system. The associated downtime also limits the productivity of the system. In addition, replenishing the grease adds to the operational cost of the system. A further drawback is that the grease will eventually lead to oil drips or other oily messes. Thus, there are needs to improve the maintenance, operational costs, and environmental friendliness of cantilevered screw assemblies.
- known cantilevered screw assemblies have a tendency to shift in position or wobble during operation.
- the anchoring of known cantilevered screw assemblies may also limit load-bearing capacity.
- known assemblies may cantilever a screw to a load-bearing wall.
- the load-bearing wall may limit the size of the screw and the amount of material that can be processed. If the size of the screw is excessive, it may compromise the load-bearing wall. For example, it may lead to oil canning of the load-bearing wall. Oil canning may affect the operation of the screw as aforementioned, and it may eventually render the system inoperable.
- Exemplary embodiments may satisfy one or more of the aforementioned needs.
- One exemplary embodiment of a cantilevered screw assembly may include at least one bearing that includes solid oil.
- one embodiment of a cantilevered screw assembly may include at least one bearing that is filled with solid oil.
- Such embodiments of a cantilevered screw assembly may offer numerous advantages including substantially decreased maintenance, lower operational costs, higher system efficiency, and improved environmental characteristics. It is estimated that the bearings of some exemplary embodiments may last at least two times longer between maintenance intervals as compared to a comparable cantilevered screw assembly that uses grease-lubricated bearings, which may significantly lower operational costs and raise operational efficiently. Moreover, oil leaks and drips may be substantially eliminated, drastically reducing the environmental impact.
- a cantilevered screw assembly includes an improved anchor system comprising multiple load-bearing walls.
- an exemplary embodiment may comprise a screw that is cantilevered to at least two walls.
- the improved anchor system may allow for a larger screw without compromising stability or the integrity of the load-bearing walls.
- exemplary embodiments may enable more material to be processed by the cantilevered screw assembly with greater power and torque.
- FIG. 1 is a cross-section view of an exemplary embodiment of a cantilevered screw assembly.
- FIG. 2 is a perspective view of the cantilevered screw assembly of FIG. 1 .
- FIG. 3 is a perspective view of an exemplary embodiment of a load-bearing wall assembly of the cantilevered screw assembly of FIG. 1 .
- FIG. 4 is a top plan view of the load-bearing wall assembly of FIG. 3 .
- FIG. 5 is a perspective view of the cantilevered screw assembly of FIG. 1 . In this view, portions have been removed or rendered transparent for clarity.
- FIG. 6 is a side elevation view of the cantilevered screw assembly of FIG. 5 , wherein portions have been removed or rendered transparent for clarity.
- FIGS. 1-6 show various views of one embodiment of a cantilevered screw assembly 10 comprising a screw 12 , which has a shaft 14 .
- the shaft 14 has a slight taper.
- Other types of cantilevered screw assemblies may also benefit from aspects of the present invention. For instance, some embodiments may not have a shaft with a taper, while other embodiments may have a shaft with a reverse taper. For embodiments that have a shaft with a taper or reverse taper, the degree of the taper or reverse taper may be selected to fit the application of the cantilevered screw assembly.
- One aspect of an exemplary embodiment is the use of at least one solid oil bearing in association with shaft 14 to facilitate rotation.
- a first solid oil bearing 20 and a second solid oil bearing 22 enable rotation of shaft 14 .
- Other exemplary embodiments may include the use of more solid oil bearings.
- An example of a solid oil bearing may have a cavity that is filled with solid oil.
- solid oil bearing 20 has a cavity 24 that is filled with solid oil 26 .
- Solid oil 26 may form adjacent or around the rolling elements of bearing 20 , for example, to provide lubrication.
- Other bearing designs comprising solid oil are also possible.
- solid oil is comprised of oil in a polymer matrix or structure.
- the supporting matrix or structure may be comprised of other types of plastic or other suitable material for retaining or reabsorbing the oil.
- oil from the solid oil may provide lubrication substantially without dripping because the supporting material may have a porous structure that retains or reabsorbs the oil.
- the oil may coat contacting surfaces (e.g., the rolling elements), and the supporting structure is adapted to reabsorb any excess oil such that it is not expelled. Examples of solid oil are available from PhyMet, Inc. and SKF Group.
- screw 12 is cantilevered to the walls of a multiple wall assembly 30 .
- the multiple wall assembly 30 is comprised of at least a first wall 32 and a second wall 34 to which the screw 12 is cantilevered.
- This exemplary embodiment of multiple wall assembly 30 also includes a third wall 36 associated with shaft 14 .
- Other embodiments may have more walls and/or may have a third wall that is not associated with the screw shaft.
- the association of the screw with the multiple wall assembly may provide improved structural support for the cantilevered assembly as compared to a single wall cantilevered assembly. Such an embodiment may increase the stability of the screw and also allow for a larger and more powerful screw that has the capacity to process more material.
- Each wall is comprised of metal in this exemplary embodiment. In other embodiments, other materials having suitable structural properties may be used.
- first wall 32 is connected to second wall 34 by at least one reinforcement member.
- the use of an exemplary embodiment of at least one reinforcement member may further improve the stability of the screw and walls and also allow for an even larger and more powerful screw that is adapted to process more material.
- This embodiment includes a first reinforcement member 40 , a second reinforcement member 42 , a third reinforcement member 44 , a fourth reinforcement member 46 , a fifth reinforcement member 48 , and a sixth reinforcement member 50 that are positioned around shaft 14 and the associated bearing assembly.
- the peripheries of first wall 32 and second wall 34 are also connected for additional reinforcement.
- Other embodiments may have less or more reinforcement members connecting the walls to achieve the desired reinforcement.
- at least one reinforcement member may have any suitable position to connect a first wall to a second wall.
- First reinforcement member 40 , second reinforcement member 42 , third reinforcement member 44 , fourth reinforcement member 46 , fifth reinforcement member 48 , and sixth reinforcement member 50 are metal pipes in this exemplary embodiment.
- Other suitable reinforcement members may be used including, but not limited to, metal bars and other hollow or solid metal members.
- other suitable materials besides metal may be used for certain applications.
- the bearing assembly may include a bearing housing adapted to house at least one bearing.
- the bearing assembly includes a bearing housing 60 for housing bearing 20 and bearing 22 .
- the bearing housing 60 extends between first wall 32 and second wall 34 in this example.
- Bearing housing 60 may serve as further reinforcement in this manner.
- an example of a bearing housing 60 may include at least one flared edge 62 and at least one flange 64 to assist with stabilization and/or securement to one or more walls (in this example, wall 32 ).
- an example of flared edge 62 may define at least one receptacle 66 to assist with securing a reinforcement member.
- second wall 34 further supports bearing housing 60 .
- Such an embodiment may increase the stability of screw 12 and the walls, and it may also allow for a larger and more powerful screw with the capacity to process more material.
- solid oil bearing 20 is substantially aligned with first wall 32
- solid oil bearing 22 is substantially aligned with second wall 34
- a bearing housing may extend out further beyond the first wall (in a distal direction) and/or the second wall (in a proximal direction), such that a bearing is not aligned with a respective wall.
- An example of such an embodiment may increase the stability and strength characteristics of the screw.
- one or more bearings may be situated between the first wall and the second wall (i.e., not aligned with either wall).
- bearing housing 60 extends about solid oil bearing 20 and solid oil bearing 22 in this example.
- a bearing housing may house fewer or more bearings.
- the bearings are not limited to solid oil bearings in this embodiment.
- this embodiment may include grease-lubricated bearings or other types of bearings.
- a drive chain assembly 70 may be situated outside of second wall 34 (i.e., on the proximal side of second wall 34 ). More particularly, drive chain assembly 70 is situated between second wall 34 and third wall 36 in this example. However, in some other exemplary embodiments, a drive chain assembly may be situated within a second wall or in another suitable position for facilitating rotation of the screw 12 .
- drive chain assembly 70 is comprised of a first sprocket 72 and a second sprocket 74 .
- sprocket 72 is shown as being transparent in order to show other exemplary features.
- Sprocket 74 is also transparent in FIG. 6 for clarity.
- second wall 34 has been removed in FIGS. 5 and 6 for clarity.
- other types of drive chain assemblies or other types of drive mechanisms may be used to facilitate rotation of the screw.
- exemplary embodiments of a cantilevered screw assembly are particularly useful for processing waste materials.
- exemplary embodiments of a cantilevered screw assembly may also serve other purposes not limited to the processing of waste materials.
- any embodiment of the present invention may include any of the optional or preferred features of the other embodiments of the present invention.
- the exemplary embodiments herein disclosed are not intended to be exhaustive or to unnecessarily limit the scope of the invention.
- the exemplary embodiments were chosen and described in order to explain some of the principles of the present invention so that others skilled in the art may practice the invention. Having shown and described exemplary embodiments of the present invention, those skilled in the art will realize that many variations and modifications may be made to the described invention. Many of those variations and modifications will provide the same result and fall within the spirit of the claimed invention. It is the intention, therefore, to limit the invention only as indicated by the scope of the claims.
Abstract
Description
- This application is a continuation of U.S. application Ser. No. 13/667,313, filed Nov. 2, 2012, which claims the benefit of U.S. Provisional Application No. 61/555,863, filed Nov. 4, 2011, each of which is hereby incorporated by reference in its entirety.
- Exemplary embodiments of the present invention relate generally to a cantilevered screw assembly. Examples of cantilevered screw assemblies may include, but are not limited to, augers, compactors, crushers, shredders, feeders, material handlers, bale breakers, briquetters, and autoclave sterilizers. Other applications of cantilevered screw assemblies are also possible.
- There is a need to improve known cantilevered screw assemblies. Large scale cantilevered screw assemblies are in particular need of improvement due to the dynamics of such systems. Nevertheless, small scale cantilevered screw assemblies may have a similar need for improvement.
- Known cantilevered screw assemblies have used grease-lubricated bearings. Such systems may provide a reservoir of grease that is supplied to the bearings. While effective, the reservoir of grease needs to be periodically refilled, which increases the necessary maintenance of the system. The associated downtime also limits the productivity of the system. In addition, replenishing the grease adds to the operational cost of the system. A further drawback is that the grease will eventually lead to oil drips or other oily messes. Thus, there are needs to improve the maintenance, operational costs, and environmental friendliness of cantilevered screw assemblies.
- Additional needs exist to improve the stability, size, and load-bearing capacity of cantilevered screw assemblies. The screws of some known cantilevered screw assemblies have a tendency to shift in position or wobble during operation. The anchoring of known cantilevered screw assemblies may also limit load-bearing capacity. For instance, known assemblies may cantilever a screw to a load-bearing wall. The load-bearing wall may limit the size of the screw and the amount of material that can be processed. If the size of the screw is excessive, it may compromise the load-bearing wall. For example, it may lead to oil canning of the load-bearing wall. Oil canning may affect the operation of the screw as aforementioned, and it may eventually render the system inoperable.
- Exemplary embodiments may satisfy one or more of the aforementioned needs. One exemplary embodiment of a cantilevered screw assembly may include at least one bearing that includes solid oil. For example, one embodiment of a cantilevered screw assembly may include at least one bearing that is filled with solid oil. Such embodiments of a cantilevered screw assembly may offer numerous advantages including substantially decreased maintenance, lower operational costs, higher system efficiency, and improved environmental characteristics. It is estimated that the bearings of some exemplary embodiments may last at least two times longer between maintenance intervals as compared to a comparable cantilevered screw assembly that uses grease-lubricated bearings, which may significantly lower operational costs and raise operational efficiently. Moreover, oil leaks and drips may be substantially eliminated, drastically reducing the environmental impact.
- Another exemplary embodiment of a cantilevered screw assembly includes an improved anchor system comprising multiple load-bearing walls. In particular, an exemplary embodiment may comprise a screw that is cantilevered to at least two walls. Examples of the improved anchor system may allow for a larger screw without compromising stability or the integrity of the load-bearing walls. Also, exemplary embodiments may enable more material to be processed by the cantilevered screw assembly with greater power and torque.
- In addition to the novel features and advantages mentioned above, other benefits will be readily apparent from the following descriptions of the drawings and exemplary embodiments.
-
FIG. 1 is a cross-section view of an exemplary embodiment of a cantilevered screw assembly. -
FIG. 2 is a perspective view of the cantilevered screw assembly ofFIG. 1 . -
FIG. 3 is a perspective view of an exemplary embodiment of a load-bearing wall assembly of the cantilevered screw assembly ofFIG. 1 . -
FIG. 4 is a top plan view of the load-bearing wall assembly ofFIG. 3 . -
FIG. 5 is a perspective view of the cantilevered screw assembly ofFIG. 1 . In this view, portions have been removed or rendered transparent for clarity. -
FIG. 6 is a side elevation view of the cantilevered screw assembly ofFIG. 5 , wherein portions have been removed or rendered transparent for clarity. - Exemplary embodiments of the present invention are directed to a cantilevered screw assembly.
FIGS. 1-6 show various views of one embodiment of a cantileveredscrew assembly 10 comprising ascrew 12, which has ashaft 14. In this example, theshaft 14 has a slight taper. Other types of cantilevered screw assemblies may also benefit from aspects of the present invention. For instance, some embodiments may not have a shaft with a taper, while other embodiments may have a shaft with a reverse taper. For embodiments that have a shaft with a taper or reverse taper, the degree of the taper or reverse taper may be selected to fit the application of the cantilevered screw assembly. - One aspect of an exemplary embodiment is the use of at least one solid oil bearing in association with
shaft 14 to facilitate rotation. In the example ofFIG. 1 , a first solid oil bearing 20 and a second solid oil bearing 22 enable rotation ofshaft 14. Other exemplary embodiments may include the use of more solid oil bearings. - An example of a solid oil bearing may have a cavity that is filled with solid oil. For example, solid oil bearing 20 has a
cavity 24 that is filled withsolid oil 26.Solid oil 26 may form adjacent or around the rolling elements ofbearing 20, for example, to provide lubrication. Other bearing designs comprising solid oil are also possible. - An example of solid oil is comprised of oil in a polymer matrix or structure. In other examples, the supporting matrix or structure may be comprised of other types of plastic or other suitable material for retaining or reabsorbing the oil. In an exemplary embodiment, oil from the solid oil may provide lubrication substantially without dripping because the supporting material may have a porous structure that retains or reabsorbs the oil. The oil may coat contacting surfaces (e.g., the rolling elements), and the supporting structure is adapted to reabsorb any excess oil such that it is not expelled. Examples of solid oil are available from PhyMet, Inc. and SKF Group.
- In another aspect,
screw 12 is cantilevered to the walls of amultiple wall assembly 30. In this example, themultiple wall assembly 30 is comprised of at least afirst wall 32 and asecond wall 34 to which thescrew 12 is cantilevered. This exemplary embodiment ofmultiple wall assembly 30 also includes athird wall 36 associated withshaft 14. Other embodiments may have more walls and/or may have a third wall that is not associated with the screw shaft. In an exemplary embodiment, the association of the screw with the multiple wall assembly may provide improved structural support for the cantilevered assembly as compared to a single wall cantilevered assembly. Such an embodiment may increase the stability of the screw and also allow for a larger and more powerful screw that has the capacity to process more material. - Each wall is comprised of metal in this exemplary embodiment. In other embodiments, other materials having suitable structural properties may be used.
- In this exemplary embodiment,
first wall 32 is connected tosecond wall 34 by at least one reinforcement member. In combination with a multiple wall assembly, the use of an exemplary embodiment of at least one reinforcement member may further improve the stability of the screw and walls and also allow for an even larger and more powerful screw that is adapted to process more material. This embodiment includes afirst reinforcement member 40, asecond reinforcement member 42, athird reinforcement member 44, afourth reinforcement member 46, afifth reinforcement member 48, and asixth reinforcement member 50 that are positioned aroundshaft 14 and the associated bearing assembly. In this example, the peripheries offirst wall 32 andsecond wall 34 are also connected for additional reinforcement. Other embodiments may have less or more reinforcement members connecting the walls to achieve the desired reinforcement. Furthermore, in other exemplary embodiments, at least one reinforcement member may have any suitable position to connect a first wall to a second wall. -
First reinforcement member 40,second reinforcement member 42,third reinforcement member 44,fourth reinforcement member 46,fifth reinforcement member 48, andsixth reinforcement member 50 are metal pipes in this exemplary embodiment. Other suitable reinforcement members may be used including, but not limited to, metal bars and other hollow or solid metal members. In addition, other suitable materials besides metal may be used for certain applications. - The bearing assembly may include a bearing housing adapted to house at least one bearing. In this embodiment, the bearing assembly includes a bearing
housing 60 forhousing bearing 20 andbearing 22. The bearinghousing 60 extends betweenfirst wall 32 andsecond wall 34 in this example. Bearinghousing 60 may serve as further reinforcement in this manner. Such as seen inFIGS. 5 and 6 , an example of a bearinghousing 60 may include at least one flarededge 62 and at least oneflange 64 to assist with stabilization and/or securement to one or more walls (in this example, wall 32). In addition, an example of flarededge 62 may define at least onereceptacle 66 to assist with securing a reinforcement member. At the same time,second wall 34 furthersupports bearing housing 60. Such an embodiment may increase the stability ofscrew 12 and the walls, and it may also allow for a larger and more powerful screw with the capacity to process more material. - With respect to the example in
FIG. 1 ,solid oil bearing 20 is substantially aligned withfirst wall 32, andsolid oil bearing 22 is substantially aligned withsecond wall 34. In other exemplary embodiments, a bearing housing may extend out further beyond the first wall (in a distal direction) and/or the second wall (in a proximal direction), such that a bearing is not aligned with a respective wall. An example of such an embodiment may increase the stability and strength characteristics of the screw. Also, in some exemplary embodiments, one or more bearings may be situated between the first wall and the second wall (i.e., not aligned with either wall). - As aforementioned, bearing
housing 60 extends aboutsolid oil bearing 20 andsolid oil bearing 22 in this example. In other exemplary embodiments, a bearing housing may house fewer or more bearings. Furthermore, the bearings are not limited to solid oil bearings in this embodiment. For instance, although solid oil bearings may be preferred, this embodiment may include grease-lubricated bearings or other types of bearings. - Referring to
FIGS. 1 and 2 , adrive chain assembly 70 may be situated outside of second wall 34 (i.e., on the proximal side of second wall 34). More particularly,drive chain assembly 70 is situated betweensecond wall 34 andthird wall 36 in this example. However, in some other exemplary embodiments, a drive chain assembly may be situated within a second wall or in another suitable position for facilitating rotation of thescrew 12. In the example shown,drive chain assembly 70 is comprised of afirst sprocket 72 and asecond sprocket 74. InFIGS. 2 , 5, and 6,sprocket 72 is shown as being transparent in order to show other exemplary features.Sprocket 74 is also transparent inFIG. 6 for clarity. Likewise,second wall 34 has been removed inFIGS. 5 and 6 for clarity. In other exemplary embodiments, other types of drive chain assemblies or other types of drive mechanisms may be used to facilitate rotation of the screw. - Due to the aforementioned benefits, the exemplary embodiments of a cantilevered screw assembly are particularly useful for processing waste materials. However, exemplary embodiments of a cantilevered screw assembly may also serve other purposes not limited to the processing of waste materials.
- Any embodiment of the present invention may include any of the optional or preferred features of the other embodiments of the present invention. The exemplary embodiments herein disclosed are not intended to be exhaustive or to unnecessarily limit the scope of the invention. The exemplary embodiments were chosen and described in order to explain some of the principles of the present invention so that others skilled in the art may practice the invention. Having shown and described exemplary embodiments of the present invention, those skilled in the art will realize that many variations and modifications may be made to the described invention. Many of those variations and modifications will provide the same result and fall within the spirit of the claimed invention. It is the intention, therefore, to limit the invention only as indicated by the scope of the claims.
Claims (36)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US14/818,751 US9212005B1 (en) | 2011-11-04 | 2015-08-05 | Cantilevered screw assembly |
US14/967,968 US9346624B2 (en) | 2011-11-04 | 2015-12-14 | Cantilevered screw assembly |
US15/132,479 US9815636B2 (en) | 2011-11-04 | 2016-04-19 | Cantilevered screw assembly |
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US201161555863P | 2011-11-04 | 2011-11-04 | |
US13/667,313 US9132968B2 (en) | 2011-11-04 | 2012-11-02 | Cantilevered screw assembly |
US14/818,751 US9212005B1 (en) | 2011-11-04 | 2015-08-05 | Cantilevered screw assembly |
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US13/667,313 Continuation US9132968B2 (en) | 2011-11-04 | 2012-11-02 | Cantilevered screw assembly |
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US14/967,968 Continuation-In-Part US9346624B2 (en) | 2011-11-04 | 2015-12-14 | Cantilevered screw assembly |
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CN110937319B (en) * | 2019-12-11 | 2021-11-26 | 东华大学 | Automatic cotton bale arranging machine for straight-line bale plucker and automatic cotton bale arranging method |
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US9132968B2 (en) | 2015-09-15 |
US9212005B1 (en) | 2015-12-15 |
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