Bucket handle for electric rope shovel

Abstract

In electric rope shovels, the dipper handle must support a considerable weight, which can cause fatigue cracking at the interface between the sections of the dipper handle. Accordingly, embodiments of a dipper handle (200) are disclosed that reduce stress at the interface between the tube section (210) and the intermediate section (220) to which a push control device (160) is coupled. In particular, a gap is provided between the interface and the push hole (223) to decouple the interface from the stiffness of the coupling. Additionally, the walls of the dipper handle (200) can be thickened proximate the interface and have a beveled edge at the interface to provide a stronger, more durable weld.

Description

Technical Field

[0001] The embodiments described herein generally relate to the bucket handle in an electric rope loader, and more specifically, to the interface where the tubular section and intermediate section of the bucket handle are coupled. Background Technology

[0002] In excavation operations, electric rope loaders are used (e.g., from the working face of a mine) to remove material. For example, in one excavation cycle of an excavation operation, the operator controls the electric rope loader to load material into the bucket (e.g., dig material), rotate the bucket back to the dumping position (e.g., a hopper, transport truck, etc.), and dump the material from the bucket to the dumping position. A single excavation operation may consist of multiple such excavation cycles.

[0003] The bucket is robust and designed to handle large quantities of material. Because the bucket must be supported off the ground and spaced apart from the main body of the electric rope loader (e.g., during lifting, pushing control, rotation, and propulsion), its weight places a significant load on the machine (including on the bucket handle), which in turn must support its own weight. Fatigue cracking on the bucket handle is a particularly challenging problem in conventional electric rope loaders, especially at the interfaces between the different sections of the handle, which are typically cast as separate parts and then welded together.

[0004] U.S. Patent No. 11,773,563 (“'563 Patent”), published October 3, 2023, describes an interface between a pipe section and an intermediate section, designed to alleviate stress at that interface. This disclosure aims to overcome one or more of the problems identified by the inventors, including further reducing stress at that interface. Summary of the Invention

[0005] In one embodiment, a middle section of a bucket handle includes: an open first end; an internal cavity extending along a longitudinal axis from the first end into the middle section; and a pair of push holes extending along a transverse axis orthogonal to the longitudinal axis through corresponding sides of opposite sides of the middle section into the internal cavity, wherein the pair of push holes are aligned with each other along the transverse axis; wherein a first longitudinal distance from the first end to the center of each push hole in the pair of push holes is at least 50% of the outer diameter of the middle section at the first end.

[0006] In one embodiment, a bucket handle includes: a hollow tube section having a first end and a second end along a longitudinal axis, wherein the wall of the tube section has a uniform first thickness from the first end to a first point (which is a first distance from the second end), transitions to a second thickness from the first point to a second point (which is a second distance from the second end), and has a second thickness from the second point to an edge of the second end, wherein the edge of the second end is beveled; an intermediate section including an open third end connected to the second end of the tube section, wherein the third end has a first cross-sectional profile; a fourth end opposite the third end along a longitudinal axis, wherein the fourth end has a second cross-sectional profile different from the first cross-sectional profile, wherein the intermediate section transitions from the first cross-sectional profile to the second cross-sectional profile along the longitudinal axis; and a wall extending from the edge of the third end to the... Four ends, wherein the edge of the third end is beveled, wherein the wall of the intermediate section has a second thickness at the third end, and wherein the thickness of the wall of the intermediate section gradually decreases from the third end toward the fourth end; an internal cavity defined by the wall of the intermediate section; a pair of push holes extending along a transverse axis orthogonal to the longitudinal axis through corresponding sides of opposite sides of the intermediate section into the internal cavity, wherein the pair of push holes are aligned with each other along the transverse axis, wherein the longitudinal distance from the third end to the center of each push hole in the pair of push holes is at least 50% of the outer diameter of the intermediate section at the third end, wherein the beveled edge of the second end of the tube section and the beveled edge of the third end of the intermediate section form a groove, and wherein the tube section and the intermediate section are welded together via the groove; and a joining section coupled to the fourth end of the intermediate section, wherein the joining section is configured to be fixed to the bucket.

[0007] In one embodiment, a machine includes: a bucket handle comprising: a tube section having an open first end and an open second end along a longitudinal axis, wherein the tube section has a hollow interior extending from the first end to the second end; an intermediate section including an open third end coupled to the second end of the tube section; an internal cavity extending along a longitudinal axis from the third end of the intermediate section to an opposing fourth end; and a pair of push holes extending along a transverse axis orthogonal to the longitudinal axis through corresponding sides of opposite sides of the intermediate section into the internal cavity, wherein the pair of push holes are aligned with each other along the transverse axis, wherein the push holes extend from the third end to the second end of the tube section into the internal cavity. The longitudinal distance between the centers of each push hole in the pressure hole is at least 50% of the outer diameter of the intermediate section at the third end; and a connecting section connected to the fourth end of the intermediate section, wherein the connecting section is configured to be fixed to the bucket; and a push control device comprising a cylindrical housing; and a piston configured to retract into and extend from the cylindrical housing, wherein the cylindrical housing is at least partially built into the hollow interior of the tube section such that when the piston is fully retracted into the cylindrical housing, the distal portion of the piston extends through the interface between the second end of the tube section and the third end of the intermediate section, and wherein the distal end of the piston is fixed to the intermediate section via the pair of push holes. Attached Figure Description

[0008] By studying the accompanying drawings, details regarding the structure and operation of embodiments of this disclosure can be partially gathered, in which the same reference numerals denote the same parts, and wherein:

[0009] Figure 1 This is a side view of a machine including a bucket handle according to one embodiment;

[0010] Figure 2 This is a perspective view of a bucket handle according to one embodiment;

[0011] Figure 3 This is a cross-sectional view of the interface between the tube section and the intermediate section of the bucket handle according to one embodiment;

[0012] Figure 4 This is a separate perspective view of the middle section of the bucket handle according to one embodiment; and

[0013] Figure 5 This is a separate cross-sectional view of the middle section according to one embodiment. Detailed Implementation

[0014] The specific embodiments described below with reference to the accompanying drawings are intended to be descriptions of various embodiments and are not intended to represent the only embodiments that can be practiced with respect to this disclosure. Specific details are included to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that embodiments of the invention can be practiced without these specific details.

[0015] In some cases, for the sake of brevity, well-known structures and components are shown in a simplified form. For clarity and ease of explanation, some surfaces and details may be omitted from this specification and the accompanying drawings. It should also be understood that the various components illustrated herein are not necessarily drawn to scale. In other words, features disclosed in the various embodiments may be implemented within and between components using relative dimensions different from those illustrated in the drawings.

[0016] As used herein, the terms “side,” “top,” “bottom,” “front,” “back,” “above,” “below,” “top-side,” and “lower side,” etc., are used for ease of understanding to convey the relative positions of various components with respect to each other and do not imply any particular orientation of those components in absolute terms (e.g., relative to the external environment or the ground). Additionally, the terms “corresponding” and “respectively” indicate the association between members of a first set of components and members of a second set of components. For example, the phrase “each component A connected to corresponding component B” would mean A1 connected to B1, A2 connected to B2, ..., AN connected to BN. Furthermore, reference numerals with additional letters will be used to refer to specific components, while the same reference numerals without any additional letters will be used to collectively refer to multiple components or to refer to general or arbitrary instances of components.

[0017] Figure 1 This is a side view of a machine 100 including a bucket handle 200 according to one embodiment. Machine 100 is illustrated as an electric rope loader (ERS). Examples of electric rope loaders include the Model 7295, Model 7395, and Model 7495 electric rope loaders supplied by Caterpillar Inc. of Peoria, Illinois, as well as various models of electric rope loaders supplied by other manufacturers. However, it should be understood that machine 100 can be any type of machine (including other types of loaders) utilizing the bucket handle 200, as well as machines using the bucket handle 200 for other types of working implements.

[0018] Machine 100 may include a main body 110. The main body 110 may include a cab 112, which houses one or more control devices for machine 100 and is configured to accommodate one or more field operators. The operator in cab 112 can use the control devices relative to the ground to operate machine 100 (including propulsion of machine 100) and move or otherwise operate one or more work implements or other components of machine 100 (e.g., lifting, pressing, rotating, etc.). Additionally or alternatively, machine 100 may be remotely operated and / or capable of autonomous or semi-autonomous operation. In these cases, cab 112 may be omitted.

[0019] The main body 110 may include a chassis mounted on a turntable 120, which is connected to and / or supported by one or more ground engagement members 130. The turntable 120 is configured to rotate the main body 110 relative to the ground engagement member 130. For example, the turntable 120 may allow the main body 110 to rotate 360 ​​degrees relative to the ground engagement member 130. Alternatively, the turntable 120 may limit the rotation of the main body 110 relative to the ground engagement member to less than 360 degrees (e.g., 270 degrees, 180 degrees, etc.).

[0020] The ground engagement member 130 is illustrated as a track, but may include any mobility system capable of moving relative to the ground, such as two or more axles of wheels with tires. It should be understood that when the ground engagement member 130 includes a track, a pair of tracks may be present on either side of the machine 100. Similarly, when the ground engagement member 130 is a wheel, at least two wheels may be present on either side of the machine 100.

[0021] In the case where machine 100 is an electric rope loader, the working implements of machine 100 may include boom 140, frame 150, push control device 160, bucket 170, and bucket handle 200. Boom 140 is fixed to the front end of body 110 at a first end and extends upward and away from body 110, such that the second end of boom 140 is positioned in front of and above cab 112.

[0022] A frame 150, exemplified as an A-frame, can be secured to a body 110 so as to extend vertically above the body 110. A cable 152 can be secured to the frame 150 at a first end, pass through one or more holes at a second end of the boom 140, and then secured to the frame 150 at the second end, such that the cable 152 at least partially supports the second end of the boom 140 against its weight. In an alternative embodiment, a different mechanism may be used to support the boom 140.

[0023] The saddle block 142 can be fixed to the boom 140 at a location between the first and second ends (e.g., approximately midway). The saddle block 142 can be configured to surround the boom 140 with respect to a perpendicular angle. Figure 1 The saddle block 142 pivots on the vertical axis of the perspective plane. The saddle block 142 may pivot via a yoke or other mechanism. The saddle block 142 is configured to slidably receive the bucket handle 200 and may include additional support structures and / or features for supporting the bucket handle 200.

[0024] The push control device 160 can be fixed by the saddle block 142. The push control device 160 can be hydraulically driven. In this case, the push control device 160 may include a double-acting hydraulic actuator comprising a cylindrical housing fixed by the saddle block 142 and a piston movable relative to the cylindrical housing. The piston can retract into and extend out of the cylindrical housing according to the hydraulic pressure applied to the piston within the cylindrical housing.

[0025] The piston of the push control device 160 can be fixed to the bucket handle 200, as discussed elsewhere herein. Therefore, the bucket handle 200 will move together with the piston relative to the cylindrical housing of the push control device 160 and the saddle block 142 to which the cylindrical housing is fixed. Specifically, when the piston retracts into the cylindrical housing, the bucket handle 200 will retract toward the saddle block 142, and when the piston extends out of the cylindrical housing, the bucket handle 200 will extend away from the saddle block 142.

[0026] In an alternative embodiment, the push control device 160 may include various mechanisms for moving the bucket handle 200, such as a rack and pinion mechanism or a rope push mechanism. The rope push mechanism may include a push roller, a push rope, and a retraction rope. The push rope may be attached to a first end of the bucket handle 200 furthest from the bucket 170, extend over one or more pulleys near the center of the bucket handle 200, and terminate at the push roller. The retraction rope may be attached to a second end of the bucket handle 200 closest to the bucket 170, extend over one or more pulleys, and terminate at the push roller. Rotation of the push roller in a first direction will extend the bucket handle 200, and rotation of the push roller in a second direction opposite to the first direction will cause the bucket handle 200 to retract.

[0027] The bucket handle 200 is secured to the bucket 170 at the end opposite the push control device 160. For ease of understanding, the opening 171 of the bucket 170 will be referred to as being positioned at the top of the bucket 170, although the opening is illustrated as substantially orthogonal to the ground. The top rear end of the bucket 170 near the rear end portion of the opening 171 may include a first mounting structure 172 that is directly secured to the bucket handle 200. The first mounting structure 172 may include a pair of holes aligned with each other along a vertical axis and aligned along the vertical axis with corresponding holes in the bucket handle 200. Thus, the first mounting structure 172 may be directly secured to the bucket handle 200 by a pin or other fastening mechanism passing through the aligned holes of the first mounting structure 172 and the bucket handle 200. The pin allows the bucket 170 to pivot relative to the bucket handle 200 within a certain angular range. In an alternative embodiment, another mechanism may be used to secure the bucket 170 to the bucket handle 200.

[0028] The rearmost end of the bucket 170 near the bottom 178 may include a second mounting structure 174, which is indirectly fixed to the bucket handle 200. The second mounting structure 174 may include a pair of holes aligned with each other along a vertical axis and aligned with corresponding holes in the link 180 along the vertical axis. Therefore, the second mounting structure 174 may be fixed to the link 180 by a pin or other fastening mechanism passing through the aligned holes of the second mounting structure 174 and the link 180. Similarly, the link 180 may include a pair of holes aligned with each other along a vertical axis and aligned with corresponding holes in the bucket handle 200 along the vertical axis. Therefore, the link 180 may be directly fixed to the bucket handle 200 by a pin passing through the aligned holes of the link 180 and the bucket handle 200. The pin allows the link 180 to pivot relative to the bucket handle 200 within an angular range. The link 180 controls the rotation of the bucket 170 relative to the bucket handle 200. In an alternative embodiment, another mechanism may be used to indirectly or directly attach the bucket 170 to the bucket handle 200.

[0029] Bucket 170 (which may also be referred to as a “bucket”) is configured to scoop material through opening 171, for example, during mining operations. The top leading edge of bucket 170 may include teeth 176 and / or other features that aid in digging and scooping material into opening 171. Bucket 170 may also include an articulated bottom 178 that is pivotable relative to the body of bucket 170. Bottom 178 is pivotable to an open position to dump material from bucket 170 and to a closed position when material is loaded into bucket 170.

[0030] The machine 100 may include a first pulley 192 fixed to a second end of the boom 140; and a second pulley 194 fixed to the top rear edge of the bucket 170, located in front of and spaced apart from the first mounting structure 172. One end of a lifting cable 196 may be fixed to a lifting drum or winch on the body 110. The other end of the lifting cable 196 may be wound around the first pulley 192, around the second pulley 194, and fixed to the boom 140 near the first pulley 192. Thus, the lifting cable 196 can retract to raise the front of the bucket 170 and extend to lower the front of the bucket 170. This movement of the bucket 170 complements the extension and retraction of the bucket 170 achieved via the operation of the push control device 160, which is connected to the bucket handle 200.

[0031] Although not illustrated, machine 100 may include multiple additional components to aid in the operation of machine 100, including the operation of bucket 170. For example, machine 100 may include an internal combustion engine (e.g., powered by diesel, gasoline, or other fuels) or an electric motor (e.g., powered by a battery pack) configured to drive ground engagement member 130. Machine 100 may also include one or more electronic control modules (ECMs) that collect data based on data processing (e.g., from one or more sensors), process data, and output control commands to one or more controllable components of machine 100 (e.g., a turntable 120 for rotation, a push control device 160 for pushing, a lifting drum of a lifting cable 196 for lifting, the bottom 178 of the bucket 170 for dumping, etc.).

[0032] Figure 2 This is a perspective view of a bucket handle 200 according to one embodiment, with an enlarged illustration of a portion of the bucket handle 200. The bucket handle 200 may include a tube section 210, an intermediate section 220, and a joint section 230. Each of the tube section 210, the intermediate section 220, and / or the joint section 230 may be cast from steel and / or alloys, etc. It should be understood that in alternative embodiments, the bucket handle 200 may have fewer or more sections. The interface between the tube section 210 and the intermediate section 220 is particularly relevant to the disclosed embodiment.

[0033] Tube section 210 includes an elongated structure extending along a longitudinal axis L from a first end E1 to a second end E2, the first end being configured to mate with the push control device 160 and the second end mate with an intermediate section 220. The first end E1 of tube section 210 may be open and configured to receive the end of the push control device 160. For example, in an embodiment where the push control device 160 includes a hydraulic actuator, at least a portion of the cylindrical housing (including the internal piston of the hydraulic actuator) may extend along the longitudinal axis L through the first end E1 into the interior of tube section 210. In this case, the distal end of the piston (which is retractable into and extends out of the cylindrical housing) may be secured to the intermediate section 220 via a push hole 223, as will be described elsewhere herein. Thus, the push control device 160 may be secured to the bucket handle 200 via tube section 210 and through intermediate section 220.

[0034] The tube section 210 is illustrated as a cylinder with a uniform circular cross-sectional profile. However, it should be understood that the tube section 210 may have any different cross-sectional profile (e.g., rectangular, triangular, etc.), as long as the cross-sectional profile can accommodate a portion of the push control device 160 built into the tube section 210. Therefore, the terms "tube" or "tubular" should be understood to refer to the fact that the tube section 210 may be hollow from the first end E1 to the second end E2, rather than to any particular cross-sectional profile. In any case, the outer profile of the tube section 210 may be configured to slide relative to the saddle block 142 during the extension and retraction of the bucket handle 200 via the push control device 160.

[0035] Intermediate section 220 extends along the longitudinal axis L from an open first end E3 (also referred to herein as the third end) abutting the second end E2 of tube section 210, to a second end E4 (also referred herein as the fourth end) abutting the engagement section 230. In other words, the second end E2 of tube section 210 is coupled to the first end E3 of intermediate section 220. Intermediate section 220 may include a pair of protrusions 222, each surrounding a corresponding push hole 223, to provide increased strength around the push hole 223 and to facilitate coupling of intermediate section 220 to push control device 160. The protrusions 222 and the corresponding push holes 223 are positioned on opposite sides of the hollow intermediate section 220 so that they face each other, such that the push holes 223 are perpendicular to the longitudinal axis L and perpendicular to the longitudinal axis L. Figure 1 The vertical axis is aligned with the corresponding transverse axis R. Therefore, a pin or other fastening mechanism can be inserted along the transverse axis L through the corresponding holes passing through the two push holes 223 and through the end of the piston of the push control device 160, thereby securing the piston to the intermediate section 220.

[0036] The engagement section 230 extends along the longitudinal axis L from a first end E5 (also referred to herein as the fifth end) that abuts against the second end E4 of the intermediate section 220, to a second end E6 (also referred herein as the sixth end) that engages with the bucket 170. In other words, the first end E5 of the engagement section 230 is coupled to the second end E4 of the intermediate section 230, and the second end E6 of the engagement section 230 is coupled to the bucket 170. In the illustrated embodiment, the engagement section 230 includes a pair of engagement fingers 232 spaced apart from each other along the transverse axis R. Each engagement finger 232 may include a corresponding hole 233. For example, engagement finger 232A includes hole 233A, and engagement finger 232B includes hole 233B. The holes 233 are positioned facing each other such that the holes 233 are aligned along the transverse axis R. The fingers 232 are configured to engage with a first mounting structure 172. Specifically, a pair of holes within the first mounting structure 172 may be aligned with the holes 233 along the transverse axis R. Therefore, the first mounting structure 172 can be directly fixed to the engagement section 230 by a pin or other fastening mechanism that passes through the hole in the first mounting structure 172, wherein the hole 233 is aligned between the pair of holes in the first mounting structure, thereby directly fixing the bucket handle 200 to the bucket 170.

[0037] The underside of the engagement section 230 may include a pair of engagement structures 234 spaced apart from each other along the transverse axis R. Each engagement structure 234 may include a corresponding hole 235. For example, engagement structure 234A includes hole 235A, and engagement structure 234B includes hole 235B. The holes 235 are positioned facing each other such that the holes 235 are aligned along the transverse axis R. The engagement structures 234 are configured to engage with the link 180. Specifically, a pair of holes within the link 180 may be aligned with the holes 235 along the transverse axis R. Thus, the link 180 may be directly secured to the engagement section 230 by pins or other fastening mechanisms that pass through the holes of the link 180, wherein the holes 235 are aligned between the pair of holes within the link. As discussed elsewhere herein, the opposite ends of the link 180 may be secured to a second mounting structure 174 of the bucket 170, thereby indirectly securing the bucket handle 200 to the bucket 170.

[0038] Intermediate section 220 may have a first cross-sectional profile at a first end E3 and a second cross-sectional profile at a second end E4 that differs from the first cross-sectional profile. For example, the first cross-sectional profile may be circular, and the second cross-sectional profile may be rectangular. The first cross-sectional profile and external dimensions of intermediate section 220 at the first end E3 match the cross-sectional profile and external dimensions of tube section 210 at the second end E2, such that the outer surfaces are generally continuous after being joined (e.g., welded) together. Similarly, the second cross-sectional profile and external dimensions of intermediate section 220 at the second end E3 match the cross-sectional profile and external dimensions of joining section 230 at the first end E5, such that the outer surfaces are generally continuous after being joined (e.g., welded) together. Thus, the outer profile of intermediate section 220 (e.g., via casting) is shaped to transition from the cross-sectional profile of tube section 210 at the second end E2 to the cross-sectional profile of joining section 230 at the first end E5. Thus, although manufactured as different sections, the entire bucket handle 200 has a generally continuous outer surface.

[0039] Figure 3 According to one embodiment, along Figure 2 A cross-sectional view of the interface between the tubular section 210 and the intermediate section 220 of the bucket handle 200, cut by line AA, with an enlarged illustration of the interface. In the main view, a portion of the push control device 160 is visible in or near the retracted position, but is omitted in the enlarged illustration.

[0040] The illustrated portion of the push control device 160 includes a cylindrical housing 162 with a built-in piston 164. The cylindrical housing 162 has an outer diameter that matches (e.g., is equal to or slightly smaller than) the inner diameter of the tube section 210, allowing the cylindrical housing 162 and the tube section 210 to slide relative to each other. The push control device 160 may also include a sleeve 166 located at the open end of the cylindrical housing 162 to facilitate sliding of the tube section 210 relative to the cylindrical housing 162.

[0041] The end portion of piston 164 is fixed to intermediate section 220. Specifically, the end portion of piston 164 includes a engagement structure 165, which includes a portion along the transverse axis R (i.e., Figure 3 A hole oriented along the vertical axis of the intermediate section 220. This hole is configured to align along the transverse axis R within the hollow interior cavity of the intermediate section 220 with a pair of push holes 223 passing through the side of the intermediate section 220. A pin 310 or other fastening mechanism can be inserted and secured through the pair of push holes 223, wherein the hole of the engagement structure 165 is aligned between the pair of push holes, thereby securing the piston 164 to the intermediate section 220.

[0042] During operation of the push control device 160, the cylindrical housing 162 remains substantially stationary. Therefore, the piston 164 can extend along the longitudinal axis L, causing the bucket handle 200 (including the tube section 210, intermediate section 220, and engagement section 230) to slide away from the cylindrical housing 162 via the connection between the piston 164 and the intermediate section 220. It should be understood that this extension of the piston 164, and therefore the extension of the bucket handle 200, moves the bucket 170 away from the push control device 160. Conversely, the piston 164 can retract along the longitudinal axis L, causing the bucket handle 200 (including the tube section 210, intermediate section 220, and engagement section 230) to slide towards the cylindrical housing 162 via the connection between the piston 164 and the intermediate section 220. It should be understood that this retraction of the piston 164, and therefore the retraction of the bucket handle 200, moves the bucket 170 towards the push control device 160.

[0043] In one embodiment, the edges of the second end E2 of the pipe section 210 and the first end E3 of the intermediate section 220 are beveled to form a V-shaped groove 320 around the outer circumference of the bucket handle 200. The groove 320 may form a sector S of a virtual circle. The sector S may be in the range of 30 degrees to 90 degrees, preferably in the range of 50 degrees to 70 degrees, and more preferably about 60 degrees. As used herein, unless otherwise stated, the term “about” shall be understood to add or subtract (+ / -) five (5) relevant units (e.g., degrees in this case). The groove 320 facilitates welding the pipe section 210 to the intermediate section 220. Specifically, weld material 325 may be welded from the outside of the bucket handle 200 into the groove 320, thereby securing the intermediate section 220 to the pipe section 210.

[0044] As illustrated, the outer diameter D1 at the second end E2 of the pipe section 210 and the first end E3 of the intermediate section 220 can be the same, so that the interface between the pipe section 210 and the intermediate section 220 has a uniform outer diameter D1 when welded together. Similarly, the inner diameter D2 at the second end E2 of the pipe section 210 and the first end E3 of the intermediate section 220 can also be the same, so that the interface between the pipe section 210 and the intermediate section 220 also has a uniform inner diameter D2. In other words, the wall of the bucket handle 200 can have a uniform thickness on both sides of the interface.

[0045] The inner diameter of each of the pipe section 210 and / or intermediate section 220 may be shaped to decrease near the interface. In other words, the wall thickness of each of the pipe section 210 and / or intermediate section 220 may increase near the interface. It should be understood that the wall thickness of the pipe section 210 is defined by the distance between the outer surface 214 and the inner surface 215 of the pipe section 210, with the outer surface defining the outer diameter D1 and the inner surface defining the inner diameter D2 of the pipe section 210. Similarly, the wall thickness of the intermediate section 220 is defined by the distance between the outer surface 224 and the inner surface 225 of the intermediate section 220, with the outer surface defining the outer diameter D1 and the inner surface defining the inner diameter D2 of the intermediate section 220.

[0046] The wall thickness of pipe section 210 may have a uniform first thickness T1 from the first end E1 to a first point (which is a first distance from the interface with intermediate section 220 at the second end E2); gradually increasing to a second thickness T2 from the first point to a second point (which is a second distance from the interface less than the first distance) in a linear or curved manner; and having a uniform second thickness T2 from the second point of pipe section 210 to the chamfered edge at the second end E2. It should be understood that the first thickness T1 is less than the second thickness T2. In one embodiment, the majority of the length of pipe section 210 along the longitudinal axis L has a uniform first thickness T1. For example, the first 90% to 95% of the entire longitudinal length of pipe section 210 from the first end E1 to the second end E2 may have a uniform first thickness T1, while the transition portion and the portion of pipe section 210 having the second thickness T2 represent only 5% to 10% of the longitudinal length of pipe section 210. As a specific example, the entire longitudinal length of pipe section 210 may be 9 meters, and a continuous 8.5 meters of pipe section 210 from the first end E1 to the beginning of the transition to the second thickness T2 may have a first thickness T1. Continuing with this specific example, the length of the transition section may be 0.2 meters, and the thickness T2 may span the remaining 0.3 meters. It should be understood that the length of pipe section 210 with the first thickness T1 should be sufficient to accommodate the desired stroke of the push control device 160.

[0047] Alternatively or additionally, the wall thickness of intermediate section 220 may begin at a second thickness T2 from the chamfered edge at the first end E3 of intermediate section 220. Starting from the interface with pipe section 210 (or from a first distance from the interface), the wall thickness may gradually decrease linearly or curvilinearly to a third thickness T3, located at a second distance from the interface greater than the first distance. It should be understood that the third thickness T3 is less than the second thickness T2. The third thickness T3 may be the same as, similar to, or different from the first thickness T1.

[0048] Width W1 (which may also be referred to herein as "longitudinal distance") represents the distance between the edge of the first end E3 of the intermediate section 220 and the center of the push hole 223, while width W2 (which may also be referred to herein as "longitudinal distance") represents the distance between the edge of the first end E3 of the intermediate section 220 and the nearest point of the radius of the protrusion 222 surrounding the push hole 223, or the rounded corner 221. In the embodiment of the intermediate member disclosed in the '563 patent, width W2 is substantially zero or close to zero. In other words, the rounded corner begins at or near the edge of the intermediate member. In contrast, this embodiment spaces the rounded corner 221 along the longitudinal axis L from the edge of the first end E3 of the intermediate section 220 by width W2. It should be understood that, relative to the embodiment of the intermediate member in the '563 patent, the increase in width W2 causes width W1 to increase by the value of width W2.

[0049] Exemplary values ​​for various dimensions and ratios for the interface between pipe section 210 and intermediate section 220 will now be provided. It should be understood that these values ​​and ratios are merely examples, and the precise dimensions and ratios will depend on the dimensions of the push control device 160, bucket 170, bucket handle 200 and / or other components of machine 100, the design goals and requirements of machine 100, and / or other factors.

[0050] In one embodiment, the second thickness T2 is 10% to 40% larger than the first thickness T1 and / or the third thickness T3, more preferably 20% to 30% larger, and in a particular embodiment 24% to 26% (e.g., 25%) larger. For example, the second thickness T2 may be in the range of 85 mm to 95 mm, while the first thickness T1 and the third thickness T3 may be in the range of 70 mm to 80 mm. In a particular implementation, the second thickness T2 is approximately 91 mm to 92 mm, while the first thickness T1 and the third thickness T3 are approximately 73 mm to 74 mm.

[0051] In one embodiment, the width W1 is at least 50% of the outer diameter D1, preferably between 50% and 80% of the outer diameter D1, more preferably between 60% and 70% of the outer diameter D1, and in a particular embodiment, between 62% and 64% (e.g., approximately 63%) of the outer diameter D1. For example, the thickness W1 may be in the range of 500 mm to 600 mm, while the outer diameter D1 may be in the range of 825 mm to 925 mm. In a particular implementation, the width W1 is approximately 550 mm, and the outer diameter D1 is approximately 875 mm.

[0052] In one embodiment, the width W2 is at least 10% of the outer diameter D1, preferably between 15% and 35% of the outer diameter D1, more preferably between 20% and 30% of the outer diameter D1, and in a particular embodiment, between 25% and 27% (e.g., approximately 26%) of the outer diameter D1. For example, the thickness W2 may be in the range of 200 mm to 250 mm, while the outer diameter D1 may be in the range of 825 mm to 925 mm. In a particular implementation, the width W2 is approximately 225 mm, and the outer diameter D1 is approximately 875 mm.

[0053] In one embodiment, the value of width W2 is at least 10% of width W1, preferably between 30% and 60% of width W1, more preferably between 40% and 50% of width W1, and in a particular embodiment, between 40% and 42% (e.g., 41%) of width W1. For example, width W2 may be in the range of 200 mm to 250 mm, while width W1 may be in the range of 500 mm to 600 mm. In a particular implementation, width W2 is approximately 225 mm, while width W2 is approximately 550 mm.

[0054] Figure 4 This is a separate perspective view of the intermediate section 220 of a bucket handle 200 according to one embodiment. In this view, two protrusions 222A and 222B, as well as a push hole 223A passing through protrusion 222A, are visible. Additionally, the rounded corners 221A surrounding protrusion 222 are visible. Each rounded corner 221 provides a smooth transition between the side surface of the intermediate section 220 and the corresponding protrusion 222.

[0055] As illustrated, the intermediate section 220 may have a generally circular cross-sectional profile at the first end E3 to facilitate connection to the tube section 210, and a generally rectangular cross-sectional profile at the second end E4 to facilitate connection to the engagement section 230. On a surface of the second end E4 orthogonal to the longitudinal axis L, the intermediate section 220 may include an opening 226 connecting the interior cavity of the intermediate section 220 to the interior cavity of the engagement section 230. Therefore, the entire bucket handle 200 may include an adjacent interior cavity extending from the first end E1 of the tube section 210, through the intermediate section 220, to the second end E6 of the engagement section 230. This allows the push control device 160 to be inserted through the interior of the bucket handle 200 and reduces the overall weight of the bucket handle 200.

[0056] Figure 5 According to one embodiment, along Figure 4A separate cross-sectional view of the intermediate section 220 cut along axis BB. In this view, it can be seen that the intermediate section 220 includes an internal cavity 228 extending along the longitudinal axis L from a first end E3 to a second end E4 and extending through an opening 226 into the intermediate section 220. A pair of push holes 223 extend along the transverse axis R through corresponding sides of opposite sides of the intermediate section 220 into the internal cavity 228, so as to be aligned with each other along the transverse axis R. Additionally, the intermediate section 220 includes a pair of protrusions 222 located on corresponding sides of opposite sides of the intermediate section 220, such that each protrusion 222 surrounds a corresponding push hole 223. The intermediate section 220 may also include a fillet 221 surrounding each of the pair of protrusions 222.

[0057] Furthermore, the wall thickness of the defined internal cavity 228 of the intermediate section 220 may decrease from the first end E3 to the second end E4. The wall thickness may decrease along the entire longitudinal length of the intermediate section 220. In other words, the inner diameter defined by the inner surface 225 of the intermediate section 220 may gradually increase from the first end E3 to the second end E4 in a linear or curved manner, while the outer diameter defined by the outer surface 224 of the intermediate section 220 may be uniform and constant. In an alternative embodiment, the wall thickness may decrease from the first end E3 to the second end E4 only along a portion of the longitudinal length of the intermediate section 220.

[0058] Industrial applicability

[0059] In electric rope forklifts, the bucket handle must support its own weight and the weight of the loaded bucket at a point off the ground. This indicates that fatigue cracking may occur at the interfaces between the different sections of the bucket handle. Specifically, such cracking may occur at the interface between the tube section and the intermediate section of the bucket handle.

[0060] Therefore, embodiments of the bucket handle 200 reduce stress at the interface between the tube section 210 and the intermediate section 220 by separating the interface from the stiffness of the push hub formed by the push holes 223. Specifically, the width W1 (i.e., the first longitudinal distance) from the first end E3 of the intermediate section 220 to the center of each push hole 223 can be at least 50% (e.g., 50% to 80%, 60% to 70%, 62% to 64%, etc.) of the outer diameter D1 of the intermediate section 220 located at the first end E3 of the intermediate section 220. Additionally or alternatively, the width W2 (i.e., the second longitudinal distance) from the first end E3 of the intermediate section 220 to the nearest point of the fillet 221 can be at least 10% (e.g., 15% to 35%, 20% to 30%, 25% to 27%, etc.) of the outer diameter D1 of the intermediate section 220 located at the first end E3 of the intermediate section 220. Additionally or alternatively, the width W2 may be at least 10% of the width W1 (e.g., 30% to 60%, 20% to 30%, 25% to 27%, etc.). In testing, compared to the same interface in the '563 patent, the disclosed embodiment improved weld life by more than 6% at the toe of the weld and by more than 5% at the root of the weld, thereby reducing downtime and increasing the overall productivity of the machine 100.

[0061] Furthermore, due to the contoured inner surfaces 215 and 225 of pipe section 210 and intermediate section 220, the walls of pipe section 210 and intermediate section 220 are thicker at the interface between pipe section 210 and intermediate section 220. This enhances the strength and stiffness at the interface. Compared to T1, it also increases the depth of groove 320 to T2, thereby providing a greater welding depth for weld material 325 and thus improving weld strength. In tests, compared to a reference without contoured inner surfaces, the disclosed embodiment improved weld life by more than 55% at the toe of the weld and by more than 90% at the root of the weld, thereby reducing downtime and increasing the overall productivity of machine 100.

[0062] Furthermore, using a beveled edge to form the groove 320 avoids the need to form welds on the inner surfaces 215 and 225 of the pipe section 210 and the intermediate section 220, respectively. This facilitates the connection between the pipe section 210 and the intermediate section 220, and reduces the cost and complexity of manufacturing the bucket handle 200 without affecting its performance.

[0063] It should be understood that the benefits and advantages described above may apply to one embodiment or several embodiments. Aspects described in connection with one embodiment are intended to be used with other embodiments. Any interpretation in connection with one embodiment applies to similar features of other embodiments, and elements of multiple embodiments may be combined to form other embodiments. The embodiments are not limited to embodiments that solve any or all of the described problems or embodiments that have any or all of the described benefits and advantages.

[0064] The foregoing specific embodiments are merely exemplary in nature and are not intended to limit the invention or its application and use. The described embodiments are not limited to use in conjunction with a particular type of machine. Therefore, although this embodiment is depicted and described as implemented in an electric rope forklift for ease of illustration, it should be understood that it can be implemented in a variety of other types of forklifts and machines with bucket handles, as well as in a variety of other systems and environments. Furthermore, one is not expected to be limited by any theory presented in any of the foregoing sections. It should also be understood that illustrations may include exaggerated dimensions and graphical representations to better illustrate the reference items shown, and are not to be considered limiting unless expressly stated otherwise.

Claims

1. A middle section (220) of a bucket handle (200), said middle section (220) comprising: The open first end (E3); An internal cavity (228) extends along a longitudinal axis (L) from the first end (E3) into the intermediate section (220); and A pair of push holes (223) extend along a transverse axis (R) orthogonal to the longitudinal axis (L) through corresponding sides of the opposite side of the intermediate section (220) into the internal cavity (228), wherein the pair of push holes (223) are aligned with each other along the transverse axis (R); The first longitudinal distance (W1) from the first end (E3) to the center of each of the pair of push holes (223) is at least 50% of the outer diameter (D1) of the intermediate section (220) located at the first end (E3).

2. The intermediate section (220) according to claim 1, wherein the first longitudinal distance (W1) is within 50% to 80% of the outer diameter (D1).

3. The intermediate section (220) according to claim 1, wherein the first longitudinal distance (W1) is within 60% to 70% of the outer diameter (D1).

4. The intermediate section (220) according to claim 1, wherein the intermediate section (220) further comprises a pair of protrusions (222) located on corresponding sides of the opposite sides of the intermediate section (220), wherein each of the pair of protrusions (222) surrounds a corresponding push hole of the pair of push holes (223).

5. The intermediate section (220) according to claim 4, wherein the intermediate section (220) further includes rounded corners (221) surrounding each of the pair of protrusions (222).

6. The intermediate section (220) according to claim 5, wherein the second longitudinal distance (W2) from the first end (E3) to the nearest point of each fillet (221) is at least 10% of the outer diameter (D1).

7. The intermediate section (220) according to claim 5, wherein the second longitudinal distance (W2) from the first end (E3) to the nearest point of each fillet (221) is within 15% to 35% of the outer diameter (D1).

8. The intermediate section (220) according to claim 5, wherein the second longitudinal distance (W2) from the first end (E3) to the nearest point of each fillet (221) is within 20% to 30% of the outer diameter (D1).

9. The intermediate section (220) according to claim 5, wherein the second longitudinal distance (W2) from the first end (E3) to the nearest point of each rounded corner (221) is at least 10% of the first longitudinal distance (W1).

10. The intermediate section (220) according to claim 5, wherein the second longitudinal distance (W2) from the first end (E3) to the nearest point of each fillet (221) is within 30% to 60% of the first longitudinal distance (W1).

11. The intermediate section (220) according to claim 1, the intermediate section further comprising a second end (E4) opposite to the first end (E3) along the longitudinal axis (L), wherein the thickness (T2, T3) of the wall defining the internal cavity (228) of the intermediate section (220) decreases from the first end (E3) toward the second end (E4).

12. The intermediate section (220) according to claim 1, the intermediate section further comprising a second end (E4) opposite to the first end (E3) along the longitudinal axis (L), wherein the first end (E3) has a circular cross-sectional profile, wherein the second end (E4) has a rectangular cross-sectional profile, and wherein the intermediate section (220) transitions from the circular cross-sectional profile to the rectangular cross-sectional profile along the longitudinal axis (L).

13. The intermediate section (220) according to claim 12, wherein the second end (E4) includes an opening (226) extending along the longitudinal axis (L) into the internal cavity (228).

14. A bucket handle (200), the bucket handle comprising: Pipe section (210), which is connected to the first end (E3) of the intermediate section (220). ； According to claim 1, the intermediate section (220) further includes a second end (E4) opposite to the first end (E3) along the longitudinal axis (L); and A connecting section (230) is connected to the second end (E4) of the intermediate section (220), wherein the connecting section (230) is configured to connect to the bucket (170).

15. An electric rope loader, the electric rope loader comprising: One or more ground connection components (130); Turntable (120), the turntable being connected to the one or more ground engagement members (130); The main body (110) includes a chassis mounted on the turntable (120); A boom (140) extends from the body (110); Bucket handle (200) according to claim 14; A push control device (160), fixed to the boom (140) via a saddle block (142) and fixed to the bucket handle (200) via the intermediate section (220), wherein the push control device (160) is configured to extend and retract the bucket handle (200) relative to the boom (140); and Bucket (170), the bucket being fixed to the engagement section (230) of the bucket handle (200).

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