HOIST ROPE FOR A HOIST SYSTEM

Abstract

A hoist system is provided for an industrial machine. The hoist system includes a hoist rope having an end secured to a hoist drum, and an end termination for securing the hoist rope to the hoist drum. The hoist rope is configured to be coupled to a digging attachment of the industrial machine. The hoist rope includes a first portion proximate the end termination and a second portion that is positioned between the first portion and the digging attachment. The first portion has a coefficient of friction that is higher than the second portion.

Description

FIELD

The present disclosure relates to a hoist system for an industrial machine, such as a rope shovel, and more particularly to a hoist rope having an end secured to a drum.

BACKGROUND

An industrial machine, such as an electric rope shovel for mining, may include a hoist system for lifting a digging attachment.

SUMMARY

Industrial machines may include hoist systems for articulating or moving a component of the machine.

In one independent aspect, a hoist system is provided for an industrial machine including a digging attachment. The hoist system includes a hoist drum, a hoist rope including an end secured to the hoist drum, the hoist rope configured to be coupled to the digging attachment, and an end termination for securing the end of the hoist rope to the hoist drum. The hoist rope includes a first portion proximate the end termination and a second portion that is positioned between the first portion and the digging attachment. The first portion has a coefficient of friction that is higher than the second portion.

In some aspects, the hoist drum includes one or more grooves configured to receive the hoist rope.

In some aspects, the end termination includes a fitting secured to the end of the hoist rope and a ferrule attached to the hoist drum and configured to receive the fitting. The fitting has a recessed portion for engaging a retainer.

In some aspects, the ferrule has a tapered opening for receiving the fitting.

In some aspects, the fitting has a tapered end configured to be received in the ferrule.

In some aspects, the hoist rope is wrapped around the hoist drum in a first rotational direction. The hoist drum includes a peg. The hoist rope wraps around the peg prior to the end termination such that the hoist rope reverses rotational directions to a second rotational direction that is substantially opposite the first rotational direction.

In some aspects, the first portion of the hoist rope includes a cover extending around an inner portion of the hoist rope, the cover having a higher coefficient of friction than the inner portion.

In some aspects, a surface of the hoist drum engaging the first portion of the hoist rope includes one of a thin polymer treatment, a flame-spray material deposit, and a coating (e.g., an oxide or other other material) to increase a coefficient of friction of the hoist drum.

In some aspects, a surface of the hoist drum engaging the first portion of the hoist rope includes a shot peen or media to increase a coefficient of friction of the surface and minimize sharp edges.

In some aspects, the hoist drum includes a polymer coating applied to peaks between grooves on an outer surface of the drum, the coating inhibiting the hoist rope from being cut or damaged when the hoist rope skips from one groove to another in a slack condition.

In some aspects, the first portion of the hoist rope includes a diameter that is smaller than a diameter of the second portion of the hoist rope.

In some aspects, the hoist rope has a flattened shape.

In some aspects, a roller is positioned adjacent an outer surface of the hoist drum, the roller configured to inhibit the hoist rope from coming off of the hoist drum.

In some aspects, a roller is positioned adjacent an outer surface of the hoist drum, the roller biasing a portion of the hoist rope against the hoist drum.

In some aspects, a rope shovel includes the hoist system. The rope shovel includes a boom and a handle supported on the boom, the handle supporting the digging attachment.

In another independent aspect, a hoist system is provided for an industrial machine including a digging attachment and a hoist drum. The hoist system includes a hoist rope including an end configured to be secured to the hoist drum, the hoist rope configured to be coupled to the digging attachment; an end termination positioned at the end of the hoist rope; and a ferrule coupled to the hoist drum, the ferrule engaging the end termination to secure the end of the hoist rope relative to the hoist drum. The hoist rope includes a first portion proximate the end termination and a second portion that is positioned between the first portion and the digging attachment, the first portion having a first rope diameter that is smaller than a second rope diameter of the second portion.

In some aspects, the hoist rope is configured to be wrapped around the hoist drum in a first rotational direction, and the hoist system further comprises a peg positioned on the hoist drum. A portion of the hoist rope spaced apart from the end termination is wrapped around the peg to reverse the wrap direction to a second rotational direction that is substantially opposite the first rotational direction.

In some aspects, the end termination is configured to engage a first portion of a surface of the hoist drum having a higher coefficient of friction than a second portion of the surface of the hoist drum that is spaced apart from the end termination of the hoist rope.

In some aspects, the first portion of the hoist rope includes a cover extending around an inner portion of the hoist rope, the cover having a higher coefficient of friction than the inner portion.

In some aspects, the end termination includes a fitting secured to the end of the hoist rope and a ferrule attached to the hoist drum and configured to receive the fitting. The fitting has a recessed portion for engaging a retainer.

In yet another independent aspect, a hoist rope is configured for used with a hoist system including a hoist drum. The hoist rope includes a synthetic core, an outer jacket, an end termination, and a recessed portion. The synthetic core is configured to transmit a tensile load. The outer jacket encases the synthetic core. The end termination includes a fitting secured to an end of the hoist rope, and the fitting is configured to be secured to a ferrule attached to the hoist drum. The recessed portion is positioned on an outer surface of the fitting, and the recessed portion is configured to engage a retainer for securing the fitting to the ferrule.

In some aspects, a portion of the fitting has a cylindrical shape. The end of the hoist rope is secured within an interior of the cylindrical shape.

In some aspects, the fitting has a tapered end configured to be received in the ferrule.

In some aspects, the outer jacket proximate the end termination has a higher coefficient of friction than the outer jacket that is spaced from the end termination.

In some aspects, the hoist rope includes a first portion proximate the end termination and a second portion that spaced from the end termination, the first portion having a first rope diameter that is smaller than a second rope diameter of the second portion.

In yet another independent aspect, a hoist system is provided for an industrial machine including a digging attachment. The hoist system includes a hoist drum, a hoist rope including an end secured to the hoist drum, the hoist rope configured to be coupled to the digging attachment, and an end termination for securing the end of the hoist rope to the hoist drum. The hoist rope includes a first portion proximate the end termination and a second portion that is positioned between the first portion and the digging attachment. A surface of the hoist drum has an original coefficient of friction, and a modified portion of the surface of the hoist drum has a modified coefficient of friction that is higher than the original coefficient of friction.

In some aspects, the modified portion of the surface of the hoist drum engages the first portion of the hoist rope.

In some aspects, the modified coefficient of friction is 0.15 or higher.

In some aspects, the modified portion of the surface of the hoist drum includes one of a thin polymer treatment, a flame-spray material deposit, and a coating (e.g., an oxide or other other material) to increase the modified coefficient of friction.

In some aspects, the modified portion of the surface of the hoist drum includes a shot peen or media to increase the modified coefficient of friction and minimize sharp edges.

Other aspects of the disclosure will become apparent by consideration of the detailed description and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a rope shovel.

FIG. 2 is a partial perspective view of a portion of a hoist system.

FIG. 3 is a partial perspective view of a portion of a hoist system according to one embodiment.

FIG. 4 is a partial perspective view of a portion of a hoist system according to another embodiment.

FIG. 5 is a cross-section view of a portion of the hoist system of FIG. 4.

FIG. 6 is a partial perspective view of a portion of a hoist system according to another embodiment.

FIG. 7 is a partial perspective view of a portion of a hoist system according to another embodiment.

FIG. 8 is a partial perspective view of a portion of the hoist system of FIG. 7.

FIG. 9 is a cross-sectional view of a hoist rope.

FIG. 10 is a cross-sectional view of a hoist rope according to another embodiment.

FIG. 11 is a partial perspective view of a portion of a hoist system according to another embodiment.

FIG. 12 is a side view of the portion of the hoist system of FIG. 2.

DETAILED DESCRIPTION

Before any embodiments are explained in detail, it is to be understood that the disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The disclosure is capable of other embodiments and of being practiced or of being carried out in various ways.

Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. Use of “including” and “comprising” and variations thereof as used herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Use of “consisting of” and variations thereof as used herein is meant to encompass only the items listed thereafter and equivalents thereof. Unless specified or limited otherwise, the terms “mounted,” “connected,” “supported,” and “coupled” and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings.

In general, the present disclosure relates to a hoist system of a rope shovel. The hoist system may include a hoist rope formed from a synthetic material with various features for reducing wear or damage experienced by the rope and other components of the shovel.

FIG. 1 illustrates an industrial excavating machine such as a rope shovel 10 including a base 14, a boom 26, an elongated member or handle 30, and a digging attachment or dipper 34. The base 14 includes a lower portion 16 supported by traction elements (e.g., crawlers 18) and an upper portion or rotating frame 22 supported for rotation relative to the lower portion 16 about an axis.

The boom 26 includes a first end coupled to the rotating frame 22, and a second end 50 opposite the first end. Boom sheaves 54 are supported adjacent the second end 50 of the boom 26. The boom 26 is pivotable relative to the rotating frame 22 about the first end. In some embodiments, a support member 28 may be coupled between the rotating frame 22 and the boom 26 and may limit pivoting movement of the boom 26 relative to the rotating frame 22. In other embodiments, the boom 26 may be supported by a gantry or other structure. In the illustrated embodiment, saddle blocks 52 and a shipper shaft 56 are supported on the boom 26 between the first end and the second end 50.

The handle 30 is movably coupled to the boom 26 and includes a first end 58 and a second end 60. In the illustrated embodiment, the handle 30 is supported for translational and rotational movement relative to the boom 26 by the shipper shaft 56 and the saddle blocks 52. In the illustrated embodiment, the dipper 34 is fixed to the second end 60 of the handle 30. In other embodiments, the machine 10 includes a bucket that is pivotable relative to the handle 30 about the second end 60. In other embodiments, the handle 30 may be constructed in a different manner and/or may be supported with respect to the boom 26 in a different manner. For example, the handle 30 may be a telescoping member that is pivotally connected to the boom 26 by a yoke, and the handle 30 may be driven to extend and retract by actuation of one or more fluid cylinders or ropes.

The shovel 10 further includes a hoist system 38 for reeling in and paying out a hoist cable or hoist rope 42. The hoist system 38 includes a drum 40 about which a portion of the rope 42 is wrapped. The rope 42 is secured between the drum 40 and the dipper 34, passing over the boom sheaves 54. The dipper 34 is raised or lowered relative to the boom sheave 54 as the rope 42 is reeled in or paid out, respectively.

As illustrated in FIGS. 1 and 2, the hoist drive system 38 may include one or more gears that form a gear drive or transmission for driving the drum 40 to take in or let out the rope 42. In the illustrated embodiment, the transmission is supported within a housing of a gear case 62 positioned adjacent an end of the drum 40. The gear case 62 is supported on the rotating frame 22. A tensile force or hoist force is exerted in the rope 42, which extends from the drum 40 to the boom sheave 54 and ultimately to the dipper 34 to raise and lower the dipper 34 (FIG. 1).

In the illustrated embodiments, the hoist rope 42 may be constructed from a synthetic material, such as a polymeric fiber. Replacement/service for conventional hoist ropes can be difficult and time consuming, often requiring handling heavy ropes and unplanned down time. A hoist rope 42 constructed from a synthetic material may have a lifespan that is substantially longer than conventional IWRC (independent wire rope core) steel hoist ropes (e.g., two to three times longer or more), thereby reducing the frequency of replacement/service. In addition, synthetic ropes 42 can be much lighter than conventional hoist ropes and may be easier to install. The lower mass of the synthetic rope 42 may also result in less vibration and damage to auxiliary components due to whipping of the rope 42 or unplanned movements.

A conventional rope includes an end secured to the drum at an end termination, and two or more “dead wraps” (i.e., additional revolutions of rope around the drum adjacent the end termination) may be implemented to reduce the load or tensile force transferred directly to the end termination. However, slack and sudden tightening of a rope and/or overload on the rope have been known to pull the end of the rope 42 out of the end termination or otherwise cause the end termination to fail.

As illustrated in FIG. 3, an end of the rope 42 may be secured to the drum 40 at an end termination 44. In the illustrated embodiment, the end termination 44 may include a fitting or becket 66 secured to an end of the rope 42, and the fitting 66 may be retained in an opening or ferrule 70 that is fixedly attached to the drum 40. In some embodiments, a retention bolt 74 may be inserted at least partially through the ferrule 70 to retain the fitting 66 by preventing the fitting 66 from backing out of an open end of the ferrule 70.

As best shown in FIGS. 4 and 5, the fitting 66 may include a recessed area 78 with a reduced outer diameter compared to the rest of the fitting 66. The retention fastener or bolt 74 may be inserted into the recessed area 78 to better hold the fitting 66. The fitting 66 may also be elongated to provide a large surface area in contact with the rope 42. This can provide a greater clamping force and frictional engagement between the fitting 66 and the rope 42 for an increased connection strength. Further, as best shown in FIG. 7, the fitting 66 may have a tapered end 82 to aid in alignment and insertion of the fitting 66 into the ferrule 70 while still maintaining a tight fit with the ferrule 70 in a region 80 near the retention fastener 74 (e.g., the region 80 may be positioned in front of the recessed area 78). In other embodiments, the ferrule 70 may have a tapered opening for receiving the fitting 66.

As illustrated in FIG. 6, in some embodiments an end termination 44 of a rope 42 at the drum 40 may include a bolt, post, or peg 86 attached to a flange 90 of the drum 40. The peg 86 may be inserted through a hole in the flange 90 or may be integrally coupled to the flange 90, such as by welding or other means. As such, an existing drum 40 may be retrofitted to include a peg 86 by drilling a hole in the flange 90 or by otherwise coupling the peg 86 to the flange 90. In this configuration, the rope 42 may include an end loop 94 that can be secured around the peg 86. The peg 86 may include a retention plate 98, such as a washer, on an opposite side the flange 90. The retention plate 98 and flange 90 can retain the end loop 94 and prevent lateral motion to keep the end loop 94 on the peg 86. The end of the rope 42 may have a diameter that progressively decreases toward the end, and the end loop 94 may have a smaller diameter than the rest of the rope 42. In some embodiments, the diameter of the hoist rope adjacent the end termination may be between approximately 50% and approximately 90% relative to a diameter of a working portion of the hoist rope 42. In some embodiments, the diameter of the hoist rope adjacent the end termination may be approximately 60% relative to a diameter of a working portion of the hoist rope. For example, the diameter of the working portion of the hoist rope 42 may be approximately 2.87 inches but may be approximately 1.75 inches adjacent the end portion and end loop 94. The peg 86 may be optimally sized to have a diameter of one to three times the size of the diameter of the portion of rope 42 that wraps around the peg 86. In some embodiments, the peg 86 may have a non-round shape (e.g., a tear drop shape) and may be configured to guide and support a larger portion of the end loop 94.

As illustrated in FIGS. 7 and 8, in some embodiments multiple pegs 86 may be provided and the rope 42 may extend around and/or between each of the pegs 86. As best illustrated in FIG. 8 (in which the retention plate 98 is shown as transparent), the pegs 86 can be spaced apart on the flange 90 such that the rope 42 can wrap around one of the pegs 86 before the end loop 94 is secured around the other peg 86. The wrapping and reversing direction of the rope 42 around the first peg 86 can reduce the force at the final termination of the end loop 94 around the second peg 86. As shown, a single retention plate 98 may be used that spans both pegs 86 to retain the rope 42. In another variation of an end termination 44, a single peg 86 may be used to reverse the direction of the rope 42 before the end of the rope 42 is secured using a fitting 66 and ferrule 70 as disclosed above. The first peg 86 may have a larger diameter than the second peg 86, which can assist in creating a more gradual reverse bend in the rope 42. For example, the first peg 86 may be sized to have a diameter of two to six times the size of the diameter of the portion of the rope 42 that wraps around the first peg 86.

As illustrated in FIG. 9, the hoist rope 42 may include an outer jacket 102 that encases the synthetic fibers 106 that provide the bulk of the load carrying structure of the rope 42. The jacket 102 may be made of a material with a high coefficient of friction or may otherwise have a friction enhancing material added to its outer surface (e.g., resulting in the rope 42 having a coefficient of friction of approximately 0.15 or higher). This high coefficient of friction material may be polymer based, organically based, or comprise other materials known to have a relatively high coefficient of friction. By providing a higher coefficient of friction on an outer surface of the rope 42, the dead wraps can more effectively engage the drum 40 and reduce the load transferred to the end termination 44 of the rope 42.

In portions of the rope 42 that do not engage the drum 40, it may be desirable to provide a relatively low coefficient of friction so that abrasion is reduced as the rope 42 engages with and slides across other components such as the dipper 34 or bail or even components that the rope 42 inadvertently rubs against. Thus, it may be desirable to have a first portion of the rope 42 that is typically paid out from the drum 40 (i.e., the “working portion” of the rope 42) having a low coefficient of friction, while a second portion of the rope 42 that forms the dead wraps around the drum 40 or is in constant contact (or nearly constant contact) with the drum 40 (i.e., the “dead zone” of the rope 42) has a high coefficient of friction. Accordingly, high friction enhancing material may be selectively applied to only the dead zone of the rope 42. As illustrated in FIG. 10, a primary jacket 110 may encase the synthetic fibers 106, and then a secondary jacket 114 may further encase the primary jacket 110. The primary jacket 110 may run the length of the rope 42 and have a low coefficient of friction, while the secondary jacket 114 is only applied to the dead zone of the rope 42 and may have a high coefficient of friction. In some embodiments, a single jacket 102 may be used, and the jacket 102 may transition from a lower coefficient of friction material in the working portion to a higher coefficient of friction material in the dead zone.

The working zone portion of the rope 42 nearest the dead zone may wrap and unwrap from the drum 40 and/or may consistently be in contact with the drum (additional wraps that are not considered part of the dead zone). As the rope 42 experiences changes in loading, the rope 42 may expand or contract. Thus, in some circumstances it may be desirable for some portions of the rope 42 to slide against the surface of the drum 40 to reduce friction as the rope 42 expands or contracts. Accordingly, there may be an intermediate portion between the working portion and the dead zone that also has a coefficient of friction that is lower than the coefficient of friction of the dead wraps. In addition, or alternatively, a surface of the drum 40 that receives the wraps of the intermediate portion of rope 42 may also have a lower coefficient of friction.

In some embodiments, surfaces of the drum 40 may have a high coefficient of friction (e.g., a coefficient of friction of approximately 0.15 or higher). As illustrated in FIG. 11, the drum 40 may include grooves 118 in its surface that can aid in aligning the rope 42 as it wraps around the drum 40. The first grooves 118 nearest the end termination 44 of the rope 42 may only ever interact with dead wrap portions of the rope 42 that never unwind from the drum 40. As such, these first grooves 118 that receive the dead wraps can be fitted with high friction enhancing material, since the minimal movement between the rope and the grooves 118 is unlikely to cause significant abrasion. Friction enhancers or modifiers for the grooves 118 or the drum 40 may include a thin polymer treatment, flame-spray material deposit, an oxide, or any other coating or media known to increase friction. Similarly, the drum 40 and grooves 118 may be shot peened, shot blasted, or have a similar surface treatment applied to increase the friction and/or to minimize sharp edges that could cut or damage the hoist rope. The peaks 120 between adjacent grooves 118 may have a polymer coating applied to smooth out the peaks 120 and protect the rope 42 from being cut in the event it skips a groove 118 in slack conditions.

The dead wrap area of the rope 42 that never unwinds from the drum 40 can experience less bending fatigue than the working portion of the rope 42. In some embodiments, a diameter of the rope 42 in the dead wrap area may be reduced. For example, in one embodiment the diameter may be approximately 2.5 inches compared to 2.87 inches in a working portion of the rope 42. A friction enhancing material, such as a secondary jacket 114, may be positioned on this portion of rope 42 without increasing the overall diameter of the rope 42 from the standard diameter (2.87 inches in this example).

Alternatively, the reduced diameter of the rope 42 may allow for additional dead wraps within the same width of the drum 40. A full-strength rope 42 may not be required in this portion because the load on this portion of rope 42 is already reduced by the initial one or more dead wraps. The reduced diameter may allow for the winding of additional dead wraps in the same width of the drum 40.

As illustrated in FIG. 11, a reduction of the rope 42 diameter can allow for 1.5 or more reeves to be more easily located in the same area of the drum 40. For example, as shown, a first end termination 122 of a first rope 126 and a second end termination 130 of a second rope 134 may both be located on the same flange 90 of the drum 40. The first rope 126 and second rope 134 may be aligned in alternating grooves 118. The reduced diameter of the first and second ropes 126, 134 can allow the ropes 126, 134 to be better aligned with its corresponding end terminations 122, 130 (beckets or fittings for end termination not shown) while still allowing for contact between the drum 40 and the ropes 126, 134 for greater distances (e.g., without having to overlap as much of the ropes 126, 134). The reduced diameter can also assist in an end termination 44 that includes a reverse bend similar to that shown in FIGS. 7 and 8. The reduced diameter of the rope 42 can make the rope 42 more flexible and easier to bend around a peg 86, which may have a relatively small diameter compared to the drum 40 or booms sheaves 54. The reduction in diameter of the ropes 126, 134 may be gradually tapered. The grooves 118 may be similarly gradually tapered to match the taper of the ropes 126, 134. As shown in FIG. 11, the rope 42 may be decreased in diameter for a length of rope 42 that wraps approximately ¾ of the way around the diameter of the drum 40.

In some embodiments, the hoist rope may have a flattened shape, and the hoist drum may include a groove that is shaped to accommodate the flattened shape of the fiber rope. A groove having a flatter profile may provide better support for the hoist rope while exerting less load on rubbing surfaces as the hoist rope wraps around the drum.

As illustrated in FIGS. 2 and 12, one or more rollers 138 may be positioned adjacent the drum 40 to inhibit the rope 42 from creating slack or coming off of the drum 40 to facilitate smoother loading that is less likely to wear the rope 42 or cause the end termination 44 to fail than if the rope 42 experiences shock loading due to slack or coming away from the drum 40. The rollers 138 may be spaced apart from the surface of the drum 40 such that there is minimal clearance, or even a slight interference with the dimension of the rope 42 wrapping around the drum 40. Such interference may provide a biasing force to bias the rope 42 into contact with the drum 40. The rollers 138 may have a cylindrical shape. In other embodiments, a concave sheet may extend around a portion of the surface of the drum 40 to assist in retaining the rope 42 against the surface of the drum 40.

The foregoing has been described in relation to a rope shovel. It will be apparent to one skilled in the art that the embodiments described herein could likewise be used for other industrial machines. The embodiment(s) described above and illustrated in the figures are presented by way of example only and are not intended as a limitation upon the concepts and principles of the present disclosure. As such, it will be appreciated that variations and modifications to the elements and their configuration and/or arrangement exist within the spirit and scope of one or more independent aspects as described.

Claims

1. A hoist system for an industrial machine including a digging attachment, the hoist system comprising: a hoist drum;a hoist rope including an end secured to the hoist drum, the hoist rope configured to be coupled to the digging attachment; andan end termination for securing the end of the hoist rope to the hoist drum,wherein the hoist rope includes a first portion proximate the end termination and a second portion that is positioned between the first portion and the digging attachment, the first portion having a coefficient of friction that is higher than the second portion.

2. The hoist system of claim 1, wherein the hoist drum includes one or more grooves configured to receive the hoist rope.

3. The hoist system of claim 1, wherein the end termination includes a fitting secured to the end of the hoist rope and a ferrule attached to the hoist drum and configured to receive the fitting, wherein the fitting has a recessed portion for engaging a retainer.

4. The hoist system of claim 3, wherein the ferrule has a tapered opening for receiving the fitting.

5. The hoist system of claim 3, wherein the fitting has a tapered end configured to be received in the ferrule.

6. The hoist system of claim 1, wherein a portion of the hoist rope is wrapped around the hoist drum in a first rotational direction, wherein the hoist drum includes a peg, wherein another portion of the hoist rope spaced apart from the end termination is wrapped around the peg to reverse the wrap direction to a second rotational direction that is substantially opposite the first rotational direction.

7. The hoist system of claim 1, wherein the first portion of the hoist rope includes a cover extending around an inner portion of the hoist rope, the cover having a higher coefficient of friction than the inner portion.

8. The hoist system of claim 1, wherein a surface of the hoist drum engaging the first portion of the hoist rope includes one of a thin polymer treatment, a flame-spray material deposit, and a coating (e.g., an oxide or other material) to increase a coefficient of friction of the hoist drum.

9. The hoist system of claim 1, wherein a surface of the hoist drum engaging the first portion of the hoist rope includes a shot peen or media to increase a coefficient of friction of the surface and minimize sharp edges.

10. The hoist system of claim 1, wherein the first portion of the hoist rope includes a diameter that is smaller than a diameter of the second portion of the hoist rope.

11. The hoist system of claim 1, wherein a roller is positioned adjacent an outer surface of the hoist drum, the roller configured to inhibit the hoist rope from coming off of the hoist drum.

12. A rope shovel including the hoist system of claim 1, the rope shovel including a boom and a handle supported on the boom, the handle supporting the digging attachment.

13. A hoist system for an industrial machine including a digging attachment and a hoist drum, the hoist system comprising: a hoist rope including an end configured to be secured to the hoist drum, the hoist rope configured to be coupled to the digging attachment;an end termination positioned at the end of the hoist rope; anda ferrule coupled to the hoist drum, the ferrule engaging the end termination to secure the end of the hoist rope relative to the hoist drum,wherein the hoist rope includes a first portion proximate the end termination and a second portion that is positioned between the first portion and the digging attachment, the first portion having a first rope diameter that is smaller than a second rope diameter of the second portion.

14. The hoist system of claim 13, wherein a portion of the hoist rope is configured to be wrapped around the hoist drum in a first rotational direction, the hoist system further comprising a peg positioned on the hoist drum, wherein another portion of the hoist rope spaced apart from the end termination is wrapped around the peg to reverse the wrap direction to a second rotational direction that is substantially opposite the first rotational direction.

15. The hoist system of claim 13, wherein the end termination is configured to engage a first portion of a surface of the hoist drum having a higher coefficient of friction than a second portion of the surface of the hoist drum that is spaced apart from the end termination of the hoist rope.

16. A hoist rope configured for use with a hoist system including a hoist drum, the hoist rope comprising: a synthetic core configured to transmit a tensile load;an outer jacket encasing the synthetic core;an end termination including a fitting secured to an end of the hoist rope, the fitting configured to be secured to a ferrule attached to the hoist drum; anda recessed portion positioned on an outer surface of the fitting, the recessed portion configured to engage a retainer for securing the fitting to the ferrule.

17. The hoist system of claim 16, wherein a portion of the fitting has a cylindrical shape, wherein the end of the hoist rope is secured within an interior of the cylindrical shape.

18. The hoist system of claim 16, wherein the fitting has a tapered end configured to be received in the ferrule.

19. The hoist rope of claim 16, wherein a portion of the outer jacket proximate the end termination has a higher coefficient of friction than another portion of the outer jacket that is spaced from the end termination.

20. The hoist system of claim 16, wherein the hoist rope includes a first portion proximate the end termination and a second portion that spaced from the end termination, the first portion having a first rope diameter that is smaller than a second rope diameter of the second portion.

21. A hoist system for an industrial machine including a digging attachment, the hoist system comprising: a hoist drum;a hoist rope including an end secured to the hoist drum, the hoist rope configured to be coupled to the digging attachment; andan end termination for securing the end of the hoist rope to the hoist drum,wherein the hoist rope includes a first portion proximate the end termination and a second portion that is positioned between the first portion and the digging attachment;wherein a surface of the hoist drum has an original coefficient of friction, and wherein a modified portion of the surface of the hoist drum has a modified coefficient of friction that is higher than the original coefficient of friction.

22. The hoist system of claim 21, wherein the modified portion of the surface of the hoist drum engages the first portion of the hoist rope.

23. The hoist system of claim 21, wherein the modified coefficient of friction is 0.15 or higher.

24. The hoist system of claim 21, wherein the modified portion of the surface of the hoist drum includes one of a thin polymer treatment, a flame-spray material deposit, and a coating (e.g., an oxide or other material) to increase the modified coefficient of friction.

25. The hoist system of claim 21, wherein the modified portion of the surface of the hoist drum includes a shot peen or media to increase the modified coefficient of friction and minimize sharp edges.