Patent Application
20230295904
The present disclosure generally relates to a work machine, and more specifically relates to a liner plate mounting assembly associated with protecting a work implement of a work machine.
Ground engaging equipment such as buckets, dippers, electric rope shovel buckets, and dig tools, are commonly used on work machines such as backhoes, front-end loaders, electric rope shovels, and excavators, to excavate earth material from the ground. To protect and extend the useful life of the ground engaging equipment from the abrasive and impactful forces during normal operations of the work machine, liner plates are generally installed inside and outside the sidewalls of a ground engaging equipment.
Conventional liner plates contain open slots across various central points of a liner plate so that a welding material may be provided in each slot and the perimeter of the plates to secure to a sidewall. Conventional plates need to be cut smaller to reduce the weight of each plate so that the central slot welds and perimeter welds can support the weight of each plate and keep it attached to the sidewall. If the plates are too large and heavy there is a high risk the liner plate will fall off the ground engaging equipment prematurely, especially during operation of the work machine even though the plates may still be useful. This adds unnecessary delay and service time to replace or re-weld the conventional plate back onto the sidewall of the ground engaging equipment.
The conventional plates are generally cut into smaller pieces which increases both part count and installation time. The increased number of plates creates more gaps between the plates which reduces protection and the useful life of the plates because the slots and gaps in between the plates cause the weld to be more prone to wearing out during operation of the work machine resulting in premature fall-out. When liner plates fall off prematurely, there is unnecessary added service time to re-weld or replace the liner plate with still a useful life available.
For example, U.S. Pat. No. 9,840,830 to Lammli discloses a wear strip assembly for ground engaging equipment. The wear strip assembly comprises a wear strip and a wear strip support. The wear strip has an engagement profile and a wear surface. The wear strip support defines a receiving profile complementary to the engagement profile of the wear strip. The engagement profile of the wear strip removably engages the receiving profile of the wear strip support, with the wear strip support having one or more openings distributed along an inner edge of the wear strip support and below the receiving profile. The one or more openings have a thickness that permits the wear strip support to be welded to the ground engaging equipment. However, this design uses liners that are limited to the width of the wear strip support and intended for flat sections or surfaces. For curvature sections on an excavator bucket, more narrow wear strip supports would be required. The wear strip of Lammli does not allow for the strip to be formed to the shape of the sidewall and secured directly to the sidewall by a weld and also requires an increase in gaps between the strips. Moreover, the weld is primarily provided along the wear strip support and not the wear strip itself as the wear strip is above the edge where the wear strip support meets the ground engaging equipment. The wear strip does not extend over this edge, is not formed to the shape of the ground engaging equipment, is not directly secured to the ground engaging equipment, and comprises gaps between strips.
Other methods of attaching the liner plates on a ground engaging equipment or work implement include using fastening methods. A liner plate may be available with factory mounting studs for ease of installation, utilizing stud welded bolts or self-tapping screws. However, these liner plates are prone to prematurely fall-out.
It is desirable to have a mounting assembly to reduce part counts, decrease gaps between plates, shorten installation and service time, and reduce liner plates from prematurely falling out.
In accordance with one aspect of the disclosure, a liner assembly for a work implement of a work machine is disclosed. The liner assembly comprises a sidewall of the work implement, a wedge, and a liner plate. The wedge includes a slot and a receiving channel, the wedge being mounted to the sidewall by filling the slot with a weld. The liner plate is supported by the wedge and includes an engaging channel complementary to the receiving channel to form a wedge-plate interface connecting the liner plate to the wedge and onto the sidewall.
In another embodiment, a work machine is disclosed comprising a frame, a ground engaging element supporting the frame for movement, an engine mounted on the frame, and a boom extending from the frame comprising a work implement. The work implement includes a sidewall and a liner assembly. The liner assembly including a wedge, and a liner plate. The wedge includes a slot and a receiving channel, the wedge being mounted to the sidewall by filling the slot with a weld. The liner plate is supported by the wedge and includes an engaging channel complementary to the receiving channel to form a wedge-plate interface connecting the liner plate to the wedge and onto the sidewall.
In another embodiment a method of protecting a sidewall of a work implement of a work machine using a liner assembly is disclosed. The method comprises of providing a wedge, a liner plate, and a weld material wherein the wedge includes a slot and a receiving channel, and the liner plate includes an engaging channel complementary to the receiving channel to form a wedge-plate interface for attaching the liner plate on the wedge; welding the wedge to the sidewall by filling the weld into the slot; and securing the liner plate on the wedge by inserting the engaging channel onto the receiving channel.
These along with other aspects and features of the present disclosure will be better understood upon reading the following detailed description when read in conjunction with the accompanying drawings.
The figures depict one embodiment of the presented invention for purposes of illustration only. One skilled in the art will readily recognize from the following discussion that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles described herein.
Referring now to the drawings, and with specific reference to
The work machine 100 comprises a frame 102 containing an engine 104 supported on a ground engaging element 106 illustrated as continuous tracks. It should be contemplated that the ground engaging element 106 may be any other type of ground engaging element 106 such as, for example, wheels, etc. The work machine 100 further includes a working mechanism 108 for conducting work, such as, for example, excavating landscapes or otherwise moving earth, soil, or other material. The working mechanism 108 comprises a work implement 110 used to remove earth, soil, and other material from a landscape site. As illustrated in one embodiment, the working mechanism 108 may have a boom and an arm generally found on an excavator. The work implement 110 comprises a liner assembly 112. A plurality of the liner assembly 112 may be mounted on the walls of the work implement 110 for protecting the work implement 110 during operation of the work machine 100.
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The engaging channel 500 defines the receiving channel 302 to form a wedge-plate interface. As illustrated, the receiving channel 302 has a channel orientation 400 with an angular profile, such angles capable of ranging from 5° to 85°. There may be other generally known interface or engagement profile types for allowing the liner plate 206 to attach to the wedge 202. For example, the channel orientation 400 may have a concave shape where the receiving channel 302 is rounded and the engaging channel 500 define the concavity of the receiving channel 302.
A plate side 502 of the liner plate 206 is generally thicker than the wedge width 404 and the engaging channel 500. For example, the plate side 502 may be twice as thick as the wedge width 404. The thickness of the wedge width 404 may be understood to be thick enough where a suitable amount of weld 204 filled in the slot 300 is able to secure the wedge 202 to the sidewall 200 and hold the liner plate 206 along the sidewall 200. It will be recognized that the wedge 202 may be sized differently to support a different sized liner plate 206 by scaling the receiving channel 302, the channel orientation 400, the wedge height 402, and the wedge width 404, accordingly to the environment of the work implement 110. For example, the wedge 202 may support the liner plate 206 made of metal and weigh 5000 lbs or more. The liner plate 206 may be made of metal, steel, iron, or other protective liner material suitable for work implement 110.
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In operation, the present disclosure may find applicability in many industries including, but not limited to, the construction, earth-moving, and agricultural industries. Specifically, the technology of the present disclosure may be used in work machines of such industries including but not limited to excavators, backhoes, and front-end loaders and the like having a work implement 110 such as buckets, dippers, dig tools, and the like. While the foregoing detailed description is made with specific reference to work machine dippers, it is to be understood that its teachings may also be applied onto the door and the body of a bucket or dipper as well as protecting sidewalls of work machines, work implements, and the like.
One or more embodiments of the liner assembly 112 provide advantages of reducing installation time, reducing part counts, and extending the useful life of liner assemblies for work implements by preventing premature fall-out. Preventing premature fall-out provides an advantage of reducing unnecessary delays, unnecessary service time, and extends the usability of protection by the liner plate 206 which ultimately extending the usability of the work implement 110.
The wedge 202 mounted on the dipper 900 with the weld 204 in the slot 300 eliminates requiring central slot welds in conventional plates for welding to a sidewall 200. The conventional plates with central slot welds are prone to detaching prematurely from the dipper 900 during operation of a work machine. The present disclosure provides a method for allowing the liner plate 206 to be attached to the wedge 202 reducing the risk of falling out from the dipper 900 prematurely, even when the weld 204 is worn down, as shown in the worn liner assembly 1200.
Referring to
In a step 1430, the liner plate 206 is then attached onto the wedge 202 by sliding the engaging channel 500 onto the receiving channel 302 of the wedge 202. The wedge 202 is encapsulated by the liner plate 206 formed to the sidewall 200 whereby the wedge 202 is not shown from the exterior of the liner assembly 112. The liner plate 206 may be formed to the shape of the sidewall 200 with a flat or curvature formation that can easily slide or attach onto the wedge 202.
In a step 1440, the liner plate 206 is further secured to the sidewall 200 by adding additional weld 204 around the perimeter of the liner plate 206. The gaps between the liner plate 206 may be filled with additional weld 204.
In a step 1450, the work implement 110 is then operated with the liner assembly 112 protecting the sidewall 200 of the work implement 110. For example, the dipper 900 would be protected by the liner assembly 112 during the operation of the work machine 100 when the working mechanism 108 is operating the dipper 900 against the ground, soil, or other earth material.
In a step 1460, when the new liner assembly 1000 is worn down to the worn liner assembly 1200, the worn liner assembly 1200 is quickly replaced with the new liner assembly 1000 by the method 1400 disclosed herein. After removing the worn liner assembly 1200, any unwanted weld 204 not removed from the sidewall 200 may be scraped off prior to installing the new liner assembly 1000.
The method 1400 of using the liner assembly 112, as disclosed herein, provides the work implement 110 of the work machine 100 a longer use life, longer-lasting protection, avoids premature fall-out, and provides quicker installation and service time.
From the foregoing, it can be seen that the technology disclosed herein has industrial applicability in a variety of settings such as, but not limited to, the plate lining of sides of work machines to extend the life of a wall while providing quick installation and service repair.
