An excavator arm and an excavator

Abstract

The utility model discloses an excavator stick and excavator, excavator stick includes bucket stick rear support and box type structure, the bucket stick rear support includes the first web, second web, third web and fourth web that set gradually, first web second web third web and fourth web are welded with box type structure respectively. This excavator stick, solve the problem of the excessive weight of the whole casting of rear support in the background art, solve the weight and assembly problem brought by the through type long pin shaft in the background art.

Description

Technical Field

[0001] This utility model belongs to the field of excavator technology, specifically relating to an excavator boom and an excavator. Background Technology

[0002] In existing technologies, the boom rear support typically adopts an integral cast structure. Its typical configuration is as follows: the support body is an integral cast steel part with a through hollow cylinder in the middle for inserting a pin; the two sides of the support have fan-shaped arc edges that are welded to the boom rear web plate, while the fan-shaped straight edges are welded to the lower flange and the rear bending plate; the lower part of the hollow cylinder is welded to the lower flange and the rear bending plate, and the upper part is welded to the upper flange through a reinforcing plate to form a closed box-shaped load-bearing system.

[0003] In existing boom rear support systems, in order to ensure the transmission of huge digging torque, an integral pin is required to run through the entire support, with baffles or retaining rings at both ends of the pin for axial positioning.

[0004] As excavators develop towards the 100-ton level and above, the above-mentioned integral casting bearings and their long pin connection methods have revealed the following significant defects: (1) Uncontrolled structural weight and cost. After integral casting, in order to ensure strength and rigidity, the wall thickness and external dimensions of the bearing are forced to be enlarged, resulting in the weight of the casting increasing geometrically with the specifications of the boom. On ultra-large excavators, the bearing weight can reach hundreds of kilograms, which not only directly increases material costs, but also leads to a significant increase in transportation, hoisting and subsequent maintenance costs. (2) Chain problems caused by the excessive length of the pin. Due to the overall width of the bearing, the pin needs to run through the entire bearing at once, and the length often exceeds 1.5m, with a weight approaching 100kg.

[0005] The extra-long pins make machining more difficult and heat treatment deformation control more challenging, leading to a higher scrap rate. They also result in low positioning accuracy during assembly, requiring specialized lifting tools for on-site disassembly and assembly, and causing long maintenance downtime. The high inertia of the pins themselves makes lubrication and maintenance difficult, and they are prone to premature failure due to uneven wear. This further increases the cost of raw materials and machining. Utility Model Content

[0006] One of the purposes of this utility model is to disclose an excavator boom that solves the problem of excessive weight of the overall casting of the rear support mentioned in the background art, and solves the weight and assembly problems caused by the through-type long pin shaft mentioned in the background art.

[0007] One of the purposes of this utility model is to disclose an excavator that uses the aforementioned excavator boom, thus solving the problems of large weight and high cost of existing excavators.

[0008] To achieve the above objectives, this utility model discloses an excavator stick, including a stick rear support and a box-shaped structure. The stick rear support includes a first web plate, a second web plate, a third web plate, and a fourth web plate arranged sequentially. The first web plate, the second web plate, the third web plate, and the fourth web plate are respectively welded to the box-shaped structure.

[0009] As an optional implementation, the distance between the first web and the second web and the distance between the third web and the fourth web are adapted to each other.

[0010] As an optional implementation, the box-shaped structure includes a first middle web plate, a second middle web plate, an upper wing plate, and a rear curved plate. The first middle web plate and the second middle web plate are arranged opposite to each other and are both connected to the upper wing plate. The rear curved plate is disposed between the first middle web plate and the second middle web plate. The first web plate is fixedly connected to the first middle web plate, the fourth web plate is fixedly connected to the second middle web plate, and the second web plate and the third web plate are both fixedly connected to the rear curved plate.

[0011] As an optional implementation, both the first and second intermediate web plates are welded to the upper flange, and the rear curved plate is welded to the upper flange.

[0012] As an optional implementation, the first web plate is welded to the first middle web plate, the fourth web plate is welded to the second middle web plate, and both the second web plate and the third web plate are welded to the rear bending plate.

[0013] As an optional implementation, the boom rear support further includes a pin, which includes a separate first pin and a second pin. The first pin is disposed at one end of the second pin, and the first pin and the second pin are coaxially arranged, and the outer diameters of the first pin and the second pin are compatible.

[0014] As an optional implementation, the first pin is disposed between the first web and the second web, and the second pin is disposed between the third web and the fourth web.

[0015] As an optional implementation, the two ends of the first pin are fixedly assembled with the first web and the second web, respectively, and the two ends of the second pin are fixedly assembled with the third web and the fourth web, respectively.

[0016] As an optional implementation, the first and / or the second intermediate web plates are provided with boom cylinder lugs and bucket cylinder lugs.

[0017] An excavator, including the aforementioned excavator boom.

[0018] Compared with the prior art, the beneficial effects of this utility model on the excavator boom are as follows: (1) Lightweight structure: The spliced ​​structure of the first web, second web, third web and fourth web in sequence is used to replace the integral casting, which reduces the weight by 30% to 50%, providing a feasible path for weight reduction and cost reduction of ultra-large excavators.

[0019] (2) Manufacturing and maintenance economy: The use of a spliced ​​structure with sequentially arranged first, second, third and fourth web plates to replace the integral casting eliminates the need for large casting molds during the manufacturing stage, shortening the manufacturing cycle and reducing the scrap rate. In addition, the requirements for machining accuracy are reduced, the size of the lifting tools required for disassembly and assembly is reduced, and the maintenance downtime is significantly shortened.

[0020] (3) Adjustable strength and stiffness: The splicing structure of the first web, second web, third web and fourth web in sequence is used to replace the integral casting. It can flexibly match the load requirements of excavators of different tonnages in the design stage and realize the "tailor-made" optimization.

[0021] (4) Welding process friendly: The spliced ​​structure with the first, second, third and fourth web plates set in sequence and welded to the box structure replaces the integral casting. The welding accessibility is good, and it is easy to use automatic welding or robot welding to improve the consistency of weld quality.

[0022] The beneficial effects of this excavator are as follows: the excavator adopts the aforementioned excavator boom, which reduces the difficulty of excavator molding, reduces the weight of the excavator, and further reduces the manufacturing and operating costs of the excavator. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a simplified structural diagram of the rear support of the bucket arm in this utility model.

[0025] Figure 2 yes Figure 1 The main view.

[0026] Figure 3 This is a simplified structural diagram of the excavator boom in this utility model.

[0027] Figure 4 yes Figure 3 The main view.

[0028] Explanation of key figure labels: 1. Rear support of the boom; 11. First web plate; 12. Second web plate; 13. Third web plate; 14. Fourth web plate; 15. First pin; 16. Second pin; 2. Box-type structure; 21. First middle web plate; 23. Back bend plate; 24. Bucket cylinder support lug. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0031] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0032] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0033] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0034] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0035] Please see Figure 1 and Figure 3 As shown in the figure, this application embodiment provides an excavator stick, including a stick rear support 1 and a box-shaped structure 2. The stick rear support 1 includes a first web plate 11, a second web plate 12, a third web plate 13 and a fourth web plate 14 arranged in sequence. The first web plate 11, the second web plate 12, the third web plate 13 and the fourth web plate 14 are respectively welded to the box-shaped structure 2.

[0036] In this embodiment, by splitting the original integrally cast rear support in the prior art into four independent steel plates, namely "first web plate 11, second web plate 12, third web plate 13 and fourth web plate 14", the heavy cast steel parts are completely eliminated, the structural self-weight is significantly reduced, and the problem of excessive weight of the existing rear support due to integral casting is solved. At the same time, the problem of simultaneous increase in material costs and transportation, hoisting and maintenance costs due to the surge in weight is also solved.

[0037] In this embodiment, by dividing the original integrally cast rear support into four independent steel plates—a first web plate 11, a second web plate 12, a third web plate 13, and a fourth web plate 14—the conditions for improving the pin shaft are provided, reducing the weight and assembly difficulties associated with existing through-type long shafts. In this embodiment, with the four web plates arranged side by side, the pin shaft only needs to pass through a local plate thickness to achieve connection, eliminating the need to span the entire width of the support. The length and weight of the pin shaft can be significantly reduced, effectively overcoming the drawbacks of difficult processing of ultra-long pin shafts, complex on-site disassembly and assembly, inconvenient lubrication and maintenance, and high costs.

[0038] In this embodiment, the excavator stick and stick rear support 1 achieve structural lightweighting. The integral casting is replaced by a spliced ​​structure of the first web plate 11, the second web plate 12, the third web plate 13 and the fourth web plate 14 arranged in sequence, which reduces the weight by 30% to 50%, providing a feasible path for weight reduction and cost reduction of ultra-large excavators.

[0039] In this embodiment, the excavator boom and boom rear support 1 achieve economical manufacturing and maintenance. A spliced ​​structure consisting of a first web plate 11, a second web plate 12, a third web plate 13, and a fourth web plate 14, arranged sequentially, replaces the integral casting. During the manufacturing stage, large casting molds are unnecessary, shortening the manufacturing cycle and reducing the scrap rate. Furthermore, the machining accuracy requirements are reduced, the specifications of the lifting tools required for disassembly and assembly are smaller, and maintenance downtime is significantly shortened.

[0040] In this embodiment, the excavator stick and stick rear support 1 achieve adjustable strength and stiffness. The spliced ​​structure of the first web plate 11, the second web plate 12, the third web plate 13 and the fourth web plate 14 arranged in sequence is used to replace the integral casting. It can flexibly match the load-bearing requirements of excavators of different tonnages during the design stage and achieve "tailor-made" optimization.

[0041] In this embodiment, the welding process of the excavator boom and boom rear support 1 is user-friendly. The spliced ​​structure of the first web plate 11, the second web plate 12, the third web plate 13 and the fourth web plate 14 arranged in sequence and welded to the box structure 2 replaces the integral casting. The welding accessibility is good, and it is easy to use automatic welding or robot welding, which improves the consistency of weld quality.

[0042] In some embodiments, the distance between the first web plate 11 and the second web plate 12 and the distance between the third web plate 13 and the fourth web plate 14 are adapted to each other. The first web plate 11, the second web plate 12, the third web plate 13 and the fourth web plate are evenly arranged and the structure is symmetrical, which improves the strength of the boom rear support 1 and makes the installed pin bearing reliable.

[0043] In some embodiments, the box-shaped structure 2 includes a first intermediate web plate 21, a second intermediate web plate, an upper flange, and a rear-bend plate 23. The first intermediate web plate 21 and the second intermediate web plate are arranged opposite to each other and are both connected to the upper flange. The rear-bend plate 23 is disposed between the first intermediate web plate 21 and the second intermediate web plate. The first web plate 11 is fixedly connected to the first intermediate web plate 21, the fourth web plate 14 is fixedly connected to the second intermediate web plate, and the second web plate 12 and the third web plate 13 are both fixedly connected to the rear-bend plate 23. The welding process between each web plate and the box-shaped structure 2 is readily feasible, and the welding operation process is mature, ensuring the quality of the excavator's boom.

[0044] In some embodiments, both the first intermediate web plate 21 and the second intermediate web plate are welded to the upper flange, and the rear curved plate 23 is welded to the upper flange. The box-shaped structure 2 is self-welded, with good welding process feasibility and mature welding operation technology, ensuring the quality of the excavator's boom.

[0045] In some embodiments, the first web plate 11 is welded to the first middle web plate 21, the fourth web plate 14 is welded to the second middle web plate, and the second web plate 12 and the third web plate 13 are both welded to the rear bending plate 23.

[0046] In some embodiments, the boom rear support 1 further includes a pin, which includes a separate first pin 15 and a second pin 16. The first pin 15 is disposed at one end of the second pin 16, and the first pin 15 and the second pin 16 are coaxially arranged, and the outer diameters of the first pin 15 and the second pin 16 are compatible.

[0047] In this embodiment, the pin shaft includes a separate first pin shaft 15 and a second pin shaft 16, solving the problems of difficult processing, heat treatment deformation control, and increased scrap rate caused by ultra-long pin shafts. Low positioning accuracy during assembly, requiring specialized lifting tools for on-site disassembly and assembly, and long maintenance downtime; the pin shaft itself has high inertia, making lubrication and maintenance difficult, and prone to premature failure due to uneven wear; further increasing raw material and machining costs. Traditional single-through pin shafts have a length that increases linearly with the stick width, often exceeding 1.5 m on ultra-large excavators, with a single piece weighing nearly 100 kg, leading to a simultaneous surge in raw material, heat treatment, machining, and transportation costs. This embodiment splits the integral pin shaft into a coaxially arranged first pin shaft 15 and second pin shaft 16, halving the length of a single shaft and significantly reducing weight, thus directly solving the problem of "ultra-long pin shafts."

[0048] In this embodiment, the pin includes a separate first pin 15 and a second pin 16, which solves the problems of low assembly accuracy and difficult maintenance of existing single ultra-long pins. Ultra-long pins must pass through the entire support in one go during assembly, resulting in large accumulated positioning errors. On-site disassembly and assembly require large lifting tools, and lubrication and maintenance space is limited. The segmented pins can be inserted from both sides, with independent positioning references, controllable assembly errors, and maintenance and replacement do not require complete removal, significantly reducing downtime.

[0049] In this embodiment, the pin includes a separate first pin 15 and a second pin 16, solving the problem of the contradiction between strength and weight in existing single ultra-long pin designs. Traditional ultra-long pin solutions require increasing the diameter of the ultra-long pin to ensure its bending stiffness, further increasing its weight. After the pin is segmented, the length-to-diameter ratio of each segment decreases, significantly reducing bending stress. This allows strength requirements to be met without increasing or even decreasing the diameter, achieving "weight reduction without load reduction."

[0050] In this embodiment, the pin shaft includes a separate first pin shaft 15 and a second pin shaft 16. The length of a single pin shaft is shortened by approximately 50%, and the weight is reduced by 20% to 40% simultaneously, significantly reducing material, heat treatment, and machining costs. Transportation and inventory specifications are standardized, further compressing supply chain costs. Segmented processing allows for separate control of the tolerances, surface roughness, and heat treatment deformation of each pin shaft segment, improving the finished product qualification rate. Independent positioning on both sides during assembly avoids coaxiality deviations caused by long shaft deflection. Lubrication holes can be segmented for more thorough lubrication and extended service life. The coaxial segmentation concept can be further extended to the boom front support or boom hinge point, realizing platform-based and modular applications.

[0051] In some embodiments, the first pin 15 is disposed between the first web 11 and the second web 12, and the second pin 16 is disposed between the third web 13 and the fourth web 14. The two ends of the first pin 15 are fixedly assembled to the first web 11 and the second web 12, respectively, and the two ends of the second pin 16 are fixedly assembled to the third web 13 and the fourth web 14, respectively.

[0052] In this embodiment, when wear or cracks appear on one side of the pin section, only the corresponding section needs to be disassembled for replacement, without disassembling the entire boom structure. This facilitates installation and disassembly, significantly reducing maintenance and operating costs. Furthermore, the rear support and pin adopt a separate structure, further reducing the weight of the pin.

[0053] In some embodiments, the first intermediate web plate 21 and / or the second intermediate web plate are provided with boom cylinder lugs and bucket cylinder lugs 24. The intermediate web plate has pre-reserved positions for the boom cylinder lugs and bucket cylinder lugs 24, making overall machining more convenient.

[0054] An excavator includes the aforementioned excavator stick. This excavator uses the aforementioned excavator stick, which features a novel structure and reasonable arrangement, significantly reducing the stick's weight. The rear support weight is reduced by 40%, and the pin weight by 25%, effectively lowering the production costs of the stick and the excavator. The lighter stick weight effectively improves the excavator's digging efficiency. 24 positions are reserved for the stick cylinder lugs and bucket cylinder lugs, making overall machining more convenient.

[0055] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. An excavator boom, characterized in that, The device includes a boom rear support and a box-shaped structure. The boom rear support includes a first web plate, a second web plate, a third web plate, and a fourth web plate arranged in sequence. The first web plate, the second web plate, the third web plate, and the fourth web plate are respectively welded to the box-shaped structure.

2. The excavator boom according to claim 1, characterized in that, The distance between the first web and the second web and the distance between the third web and the fourth web are adapted to each other.

3. The excavator boom according to claim 1 or 2, characterized in that, The box-shaped structure includes a first middle web plate, a second middle web plate, an upper wing plate, and a rear curved plate. The first middle web plate and the second middle web plate are arranged opposite to each other and are both connected to the upper wing plate. The rear curved plate is disposed between the first middle web plate and the second middle web plate. The first web plate is fixedly connected to the first middle web plate. The fourth web plate is fixedly connected to the second middle web plate. The second web plate and the third web plate are both fixedly connected to the rear curved plate.

4. The excavator boom according to claim 3, characterized in that, Both the first and second middle web plates are welded to the upper flange, and the rear curved plate is welded to the upper flange.

5. The excavator boom according to claim 3, characterized in that, The first web plate is welded to the first middle web plate, the fourth web plate is welded to the second middle web plate, and both the second web plate and the third web plate are welded to the rear bending plate.

6. The excavator boom according to claim 1 or 2, characterized in that, The boom rear support also includes a pin, which includes a separate first pin and a second pin. The first pin is disposed at one end of the second pin, and the first pin and the second pin are coaxially arranged, and the outer diameters of the first pin and the second pin are compatible.

7. The excavator boom according to claim 6, characterized in that, The first pin is disposed between the first web and the second web, and the second pin is disposed between the third web and the fourth web.

8. The excavator boom according to claim 7, characterized in that, The two ends of the first pin are fixedly assembled to the first web and the second web, respectively, and the two ends of the second pin are fixedly assembled to the third web and the fourth web, respectively.

9. The excavator boom according to claim 3, characterized in that, The first and / or the second intermediate web plates are provided with boom cylinder lugs and bucket cylinder lugs.

10. An excavator, characterized in that, Includes the excavator boom as described in any one of claims 1 to 9.

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