Excavator and bucket rod and working device thereof

Abstract

The utility model discloses an excavator as well as a bucket rod and a working device thereof. The excavator comprises a bucket rod main body and a pair of lug plates which are arranged oppositely, the pair of lug plates which are oppositely arranged are fixed to the tail of the bucket rod body, the lug plates are provided with slotting structures I, the portions, connected with the lug plates, of the bucket rod body are provided with slotting structures II, and the slotting structures I and the slotting structures II are in lap joint to form a tenon-and-mortise-like structure. The structural combination stability of the lug plate and the bucket rod box body is enhanced, the rigidity of a key position is improved, the stress level of a local welding seam of the lug plate is effectively reduced, the fatigue strength of the local welding seam is improved, and the service life of the bucket rod is prolonged.

Description

Technical Field

[0001] The utility model relates to a boom of an excavator, belonging to the technical field of excavators. Background Art

[0002] The boom of an excavator is an important component of the working device of the excavator. The boom ear plate connects the cylinder body end of the bucket cylinder and the cylinder rod end of the boom cylinder. During the actual operation process, due to various excavation working conditions and relatively harsh working environments, the boom ear plate is subjected to large alternating forces. However, the existing structural form of the boom ear plate and the boom sealing plate has insufficient stiffness at the arc, and is prone to deformation after being stressed, resulting in large stresses at the weld between the ear plate and the sealing plate, insufficient fatigue life of the weld, cracking, and reduced service life of the boom, as Figure 1 shown. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the utility model provides a new type of boom of an excavator. The ear plate and the boom sealing plate overlap each other to form a "mortise and tenon" structure. By optimizing the structures of the ear plate and the boom sealing plate and optimizing the transmission path of the operating force of the cylinder, the bonding stability of the ear plate and the boom box structure is enhanced, the stiffness at the key positions is improved, the stress level of the local weld of the ear plate is effectively reduced, the fatigue strength of the local weld is enhanced, and the service life of the boom is increased.

[0004] The utility model is implemented according to the following technical solutions:

[0005] In a first aspect, the utility model provides a boom of an excavator, comprising:

[0006] A boom main body;

[0007] A pair of mutually opposed ear plates fixed at the tail of the boom main body, the ear plates are provided with a slot structure I, and the boom main body is provided with a slot structure II at the part connected to the ear plates. The slot structure I and the slot structure II overlap each other to form a quasi-"mortise and tenon" structure.

[0008] In some embodiments, the boom main body includes an upper sealing plate and a tail sealing plate; a part of the ear plate is welded to the upper sealing plate in a fitting manner, and another part of the ear plate is welded to the tail sealing plate in a fitting manner.

[0009] In some embodiments, the upper sealing plate continues to extend horizontally outward at the connection with the tail sealing plate, and two symmetrically arranged grooves II are respectively provided on both sides of the end of the extension part of the upper sealing plate. The width of the groove II is slightly larger than the thickness of the ear plate; a horizontally extending groove I is provided on the side of the ear plate facing the upper sealing plate. The groove I and the groove II are welded together in a mutually perpendicular manner to form a quasi-"mortise and tenon" structure.

[0010] In some embodiments, a weight-reducing groove with an arc-transition contour is provided at a position between two groove Ⅱ on the extension part of the upper sealing plate.

[0011] In some embodiments, the tail sealing plate continues to extend obliquely upward and outward at the connection with the upper sealing plate, and a symmetrically arranged groove Ⅳ is provided on each side of the end of the extension part of the tail sealing plate. The width of the groove Ⅳ is slightly larger than the thickness of the ear plate. A groove Ⅲ extending obliquely upward is provided on the bottom surface of the ear plate facing the upper sealing plate. The groove Ⅲ and the groove Ⅳ are welded together in a perpendicular manner to form a "mortise and tenon" - like structure.

[0012] In some embodiments, the tail sealing plate is a bent plate with an arc transition at the bending part. The inner side surface of the tail sealing plate is welded to the plate member in the bucket arm main body to form a closed box - type cross - section body. The outer side surface of the tail sealing plate is welded to the ear plate.

[0013] In some embodiments, the ear plate is divided into an upper part, a middle part, and a lower part. The upper part of the ear plate is a "goose head" structure as a whole. At the mouth of the "goose head" structure, there is a gradually changing structure that extends horizontally outward with a wider inner width and a narrower outer width. The lower surface of the mouth of the "goose head" structure is welded to the upper surface of the upper sealing plate. The middle and lower parts of the ear plate are a "sickle blade" structure as a whole. At the lower part of the "sickle blade" structure, there is a gradually changing structure with a wider upper width and a narrower lower width. The inner side surface of the middle and lower parts of the ear plate is welded to the outer side surface of the tail sealing plate. An articulated hole Ⅰ is provided in the upper part of the ear plate for articulating the bucket cylinder. The articulated hole Ⅱ is generally located at the connecting bending part of the middle and lower parts of the ear plate for articulating the bucket arm cylinder. The grooving structure Ⅰ is generally located at the mouth of the "goose head" structure.

[0014] In some embodiments, a welding groove is provided at the intersection of the upper sealing plate and the tail sealing plate. The intersection of the upper sealing plate and the tail sealing plate is a "T" - shaped structure.

[0015] In a second aspect, the present utility model provides an excavator bucket arm, comprising:

[0016] A bucket arm main body, comprising an upper sealing plate and a tail sealing plate;

[0017] A pair of opposed ear plates, fixed to the tail of the bucket arm main body. A grooving structure Ⅰ is provided on the ear plates, and the upper sealing plate or the tail sealing plate of the bucket arm main body is inserted into the grooving structure Ⅰ to form a "mortise and tenon" - like structure.

[0018] In a third aspect, the present utility model provides an excavator bucket arm, comprising:

[0019] A bucket arm main body, comprising an upper sealing plate and a tail sealing plate;

[0020] A pair of opposed ear plates are fixed to the tail of the stick body. The upper cover plate or the tail cover plate of the stick body is provided with a slot structure II, and the ear plates are inserted into the slot structure II to form a structure similar to a "mortise and tenon" structure.

[0021] Fourthly, the present utility model provides an excavator working device, which includes attachments, an excavator boom, a plurality of oil cylinders, and also includes the above-mentioned excavator stick.

[0022] Fifthly, the present utility model provides an excavator, which includes the above-mentioned excavator working device.

[0023] Advantages of the present utility model:

[0024] The present utility model designs a novel excavator stick, which adopts a structure similar to a "mortise and tenon" structure, enabling the ear plates to cross with the upper cover plate or the ear plates to cross with the tail cover plate, achieving the mutual crossing of the upper cover plate, the tail cover plate and the ear plates at the key position (i.e., Figure 1 the A part in it), enhancing the stiffness of this position and the stability of the structure. At the same time, the extension of the upper cover plate and the tail cover plate of the stick towards the hinge hole I (i.e., the bucket cylinder mounting hole) achieves the effect of dispersing the force, thereby effectively reducing the maximum stress level of the local weld of the ear plate and avoiding the risk of fatigue stress cracking of the weld, greatly improving the service life of the stick. Description of the Drawings

[0025] The drawings, as a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model, but do not constitute an improper limitation to the present utility model. Obviously, the drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0026] In the drawings:

[0027] Figure 1 It is a schematic diagram of a pair of ear plate structures on an existing stick;

[0028] Figure 2 It is a schematic diagram of a preferred embodiment of a pair of ear plates on the stick of the present utility model;

[0029] Figure 3 It is a schematic diagram of a preferred embodiment of a single ear plate of the present utility model;

[0030] Figure 4 It is a schematic diagram of a preferred embodiment of the upper cover plate of the present utility model;

[0031] Figure 5 It is a schematic diagram of a preferred embodiment of the tail cover plate of the present utility model;

[0032] Figure 6 This is a schematic structural diagram of another preferred embodiment of the paired ear plates on the bucket arm of the present utility model.

[0033] Reference signs in the drawings: 1 - ear plate, 2 - upper sealing plate, 3 - tail sealing plate, 1-1 - upper part, 1-2 - hinge hole I, 1-3 - tapered structure, 1-4 - groove I, 1-5 - hinge hole II, 1-6 - tapered structure, 2-1 - weight-reducing groove, 2-2 - groove II.

[0034] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by reference to specific embodiments. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model but are not used to limit the scope of the present utility model.

[0036] In the description of the present utility model, it should be noted that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0037] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] Such as Figure 2 、 Figure 6As shown in the figure, an excavator boom includes a boom main body and a pair of opposed ear plates 1; the pair of opposed ear plates 1 are fixed to the tail of the boom main body, and the ear plates 1 are provided with a slot structure I, and the boom main body is provided with a slot structure II at the part connected to the ear plates 1. The slot structure I and the slot structure II are overlapped with each other to form a "mortise and tenon" - like structure. By optimizing the ear plate 1 and the boom sealing plate structure, optimizing the transmission path of the cylinder operating force, enhancing the bonding stability between the ear plate 1 and the boom box structure, improving the stiffness at the key positions, effectively reducing the stress level of the local welds of the ear plate 1, enhancing the fatigue strength of the local welds, and improving the service life of the boom.

[0039] Continue to refer to Figure 2 As shown in the figure, the boom main body includes an upper sealing plate 2 and a tail sealing plate 3; a part of the ear plate 1 is welded to the upper sealing plate 2 in a fitting manner, and another part of the ear plate 1 is welded to the tail sealing plate 3 in a fitting manner.

[0040] The following gives the specific connection relationship of the above - mentioned "mortise and tenon" - like structure.

[0041] Embodiment 1: As shown in Figure 2 、 Figure 3 、 Figure 4 the figure, the upper sealing plate 2 continues to extend horizontally outward at the connection with the tail sealing plate 3, and two symmetrically arranged grooves II 2 - 2 are provided on both sides of the end of the extension part of the upper sealing plate 2. The width of the groove II 2 - 2 is slightly larger than the thickness of the ear plate 1; a horizontally extending groove I 1 - 4 is provided on the side of the ear plate 1 facing the upper sealing plate 2. The groove I 1 - 4 and the groove II 2 - 2 are welded together in a perpendicular cross - manner to form a "mortise and tenon" - like structure, thereby forming a stable force - bearing structure.

[0042] A further scheme: As shown in Figure 4 the figure, a weight - reducing groove 2 - 1 with an arc - shaped transition contour is provided at the position between the two grooves II 2 - 2 on the extension part of the upper sealing plate 2.

[0043] It should be noted that the weight - reducing groove 2 - 1 is designed in the middle of the end of the upper sealing plate 2. Considering meeting the requirements of strength and reducing stress concentration, the purpose of lightweight and simplified structure is achieved. The weight - reducing groove 2 - 1 adopts a large - arc flared - mouth design, with smooth transition and no stress concentration.

[0044] Embodiment 2: As shown in Figure 6 the figure, the tail sealing plate continues to extend obliquely upward and outward at the connection with the upper sealing plate, and two symmetrically arranged grooves IV are provided on both sides of the end of the extension part of the tail sealing plate. The width of the groove IV is slightly larger than the thickness of the ear plate; an obliquely upward - extending groove III is provided on the bottom surface of the ear plate facing the upper sealing plate. The groove III and the groove IV are welded together in a perpendicular cross - manner to form a "mortise and tenon" - like structure, thereby forming a stable force - bearing structure.

[0045] It should be noted that the above two types of "mortise and tenon" structures are given. Of course, the "mortise and tenon" structure is not limited to the above embodiments, and local modifications can also be made to form an extended shape of the "mortise and tenon" structure. For example, grooves can be made only on the ear plate or the sealing plate of the dipper stick main body. The specific solutions are as follows:

[0046] Embodiment 1: A grooving structure I is provided on the ear plate, and the upper sealing plate or the tail sealing plate of the dipper stick main body is inserted into the grooving structure I to form a "mortise and tenon" structure.

[0047] A. A horizontally extending groove I is provided on the side of the ear plate facing the upper sealing plate. The upper sealing plate continues to extend horizontally outward at the connection with the tail sealing plate. After the extending part of the upper sealing plate is inserted into the groove I, they are welded together to form a "mortise and tenon" structure.

[0048] B. An obliquely upward extending groove III is provided on the bottom surface of the ear plate facing the upper sealing plate. The tail sealing plate continues to extend obliquely upward and outward at the connection with the upper sealing plate. After the extending part of the tail sealing plate is inserted into the groove III, they are welded together to form a "mortise and tenon" structure.

[0049] Embodiment 2: A grooving structure II is provided on the upper sealing plate or the tail sealing plate of the dipper stick main body, and the ear plate is inserted into the grooving structure II to form a "mortise and tenon" structure.

[0050] C. The upper sealing plate continues to extend horizontally outward at the connection with the tail sealing plate, and symmetrically arranged grooves II are provided on both sides of the end of the extending part of the upper sealing plate. The width of the groove II is slightly larger than the thickness of the ear plate; after the ear plate is inserted into the groove II, they are welded together to form a "mortise and tenon" structure.

[0051] D. The tail sealing plate continues to extend obliquely upward and outward at the connection with the upper sealing plate, and symmetrically arranged grooves IV are provided on both sides of the end of the extending part of the tail sealing plate. The width of the groove IV is slightly larger than the thickness of the ear plate; after the ear plate is inserted into the groove IV, they are welded together to form a "mortise and tenon" structure.

[0052] Therefore, as long as a "mortise and tenon" structure is formed between the ear plate and the dipper stick sealing plate, it is within the protection scope of the present utility model.

[0053] The following further describes the above-mentioned tail sealing plate.

[0054] As Figure 5 shown, the tail sealing plate 3 is designed as a bent plate, with an arc transition at its bending part, and a welding chamfer can be designed at its end; the inner side surface of the tail sealing plate 3 is welded in fit with the plate member in the dipper stick main body to form a closed box-shaped cross-section body; the outer side surface of the tail sealing plate 3 is welded in fit with the ear plate 1, and the lower part of the ear plate 1 is welded with the tail sealing plate 3 to form a stable structural body, thereby making it an important ear plate force-bearing structure.

[0055] The ear plate described above will be further explained below.

[0056] As Figure 3 shown, the ear plate 1 is divided into an upper part 1-1, a middle part, and a lower part; the upper part 1-1 of the ear plate 1 is an overall "goose head" structure, and at the mouth of the "goose head" structure is a gradually changing structure 1-3 that extends horizontally outward and is wider inside and narrower outside. The lower surface of the mouth of the "goose head" structure is fitted and welded to the upper surface of the upper sealing plate 2; the middle and lower parts of the ear plate 1 are an overall "sickle blade" structure, and at the lower part of the "sickle blade" structure is a gradually changing structure 1-6 that is wider at the top and narrower at the bottom. The inner side surface of the middle and lower parts of the ear plate 1 is fitted and welded to the outer side surface of the tail sealing plate 3; the upper part of the ear plate 1 is provided with a hinge hole I 1-2 for hinging the bucket cylinder; the hinge hole II 1-5 is generally located at the connecting bend of the middle and lower parts of the ear plate 1 for hinging the arm cylinder; the grooving structure I is generally located at the mouth of the "goose head" structure, and a welding chamfer can be designed at the grooving structure I to cooperate and overlap with the upper sealing plate 2 or the tail sealing plate 3 to form a stable and high-rigidity stress-bearing structure.

[0057] It should be noted that the gradually changing structure 1-6 at the lower part of the ear plate 1 can be designed with a welding chamfer, which gradually narrows towards the end. With minimal weight increase, the longer extension design can increase the overlapping length between the ear plate 1 and the arm main body, which is beneficial to the dispersion of the force of the arm cylinder, reduce the stress level at the lower part of the ear plate 1, and the slowly transitioning structure can effectively avoid stress concentration at the connection between the lower part of the ear plate 1 and the tail sealing plate 3.

[0058] For a further solution, as Figure 2 、 Figure 6 shown, a welding groove is provided at the intersection of the upper sealing plate 2 and the tail sealing plate 3, which can avoid the weld at this position and facilitate the welding here; the intersection of the upper sealing plate 2 and the tail sealing plate 3 is a "T" structure.

[0059] To sum up, in the embodiment of the present utility model, the ear plate and the upper sealing plate or the tail sealing plate of the arm adopt a structure similar to "mortise and tenon". Usually, when the ear plate is subjected to the alternating acting forces of the arm cylinder and the bucket cylinder, the existing overlapping welding form of the ear plate and the tail plate (see Figure 1 ) is prone to form a stress concentration area at the arc (point A), reducing the fatigue life of the weld between the ear plate and the sealing plate in this area. The novel arm ear plate structure proposed by the present utility model forms a high-rigidity structure where the upper sealing plate, the tail sealing plate, and the ear plate of the arm intersect, thereby realizing the transfer of alternating forces at the intersection of the base material of the ear plate, the base material of the upper sealing plate, and the base material of the tail sealing plate, avoiding the structural form where only the weld at the joint between the ear plate and the tail plate of the existing arm bears the acting force of the cylinder. The ear plate and the upper sealing plate or the tail sealing plate of the arm adopt a structure similar to "mortise and tenon", optimizing the transmission path of the cylinder operating force and enhancing the combination stability of the ear plate and the arm box structure.

[0060] The working device of the excavator provided by the present utility model will be described below. The working device of the excavator described below can be correspondingly referred to the excavator boom described above.

[0061] A working device of an excavator provided by the present utility model includes an attachment, an excavator boom, a plurality of oil cylinders, and also includes the excavator boom as described in any one of the above embodiments.

[0062] The beneficial effects achieved by the working device of the excavator provided by the present utility model are consistent with the beneficial effects achieved by the excavator boom provided by the present utility model, so they will not be elaborated here.

[0063] The excavator provided by the present utility model will be described below. The excavator described below can be correspondingly referred to the working device of the excavator described above.

[0064] An excavator provided by the present utility model may include the working device of the excavator as described in any one of the above embodiments.

[0065] The beneficial effects achieved by the excavator provided by the present utility model are consistent with the beneficial effects achieved by the working device of the excavator provided by the present utility model, so they will not be elaborated here.

[0066] It should be noted that the above excavator may be a crawler excavator, a wheeled excavator or other forms of excavators.

[0067] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present utility model can be practiced without these specific details. In some instances, well-known methods, structures and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0068] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features contained in other embodiments rather than other features, the combination of the features of different embodiments also means that it is within the protection scope of the present utility model and forms different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0069] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, can make some changes or modifications using the technical content prompted above to form equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An excavator bucket arm, characterized in that: include: Stick body; A pair of ear plates facing each other are fixed at the tail of the boom body, the ear plates are provided with a slotted structure I, the boom body is provided with a slotted structure II at a position connected to the ear plates, the slotted structure I and the slotted structure II are overlapped with each other to form a "mortise and tenon" structure.

2. The excavator boom according to claim 1, characterized in that: The arm body includes an upper sealing plate and a tail sealing plate; A portion of the ear plate is welded to the upper sealing plate, and another portion of the ear plate is welded to the tail sealing plate.

3. The excavator boom according to claim 2, characterized in that: The upper sealing plate continues to extend horizontally outward at the connection with the tail sealing plate, and a symmetrically arranged groove II is provided on both sides of the end of the extended portion of the upper sealing plate, and the width of the groove II is slightly greater than the thickness of the ear plate; The ear plate is provided with a horizontally extending groove I on the side facing the upper sealing plate, and the groove I and the groove II are crossed and welded together in a mutually perpendicular manner to form a "mortise and tenon" structure.

4. The excavator boom according to claim 3, characterized in that: The extended portion of the upper sealing plate is provided with a weight-reducing groove whose contour is a circular arc transition at a position between the two grooves II.

5. The excavator boom according to claim 2, characterized in that: The tail sealing plate continues to extend obliquely upward and outward at the connection with the upper sealing plate, and a symmetrically arranged groove IV is provided on both sides of the end of the extended portion of the tail sealing plate, and the width of the groove IV is slightly greater than the thickness of the ear plate; The ear plate is provided with a groove III extending obliquely upward on the bottom surface facing the upper sealing plate, and the groove III and the groove IV are crossed and welded together in a mutually perpendicular manner to form a "mortise and tenon" structure.

6. The excavator boom according to claim 2, characterized in that: The tail sealing plate is a bent plate, and its bending part adopts arc transition. The inner side of the tail sealing plate is welded to the plate in the boom body to form a closed box-type cross-section body; the outer side of the tail sealing plate is welded to the ear plate.

7. The excavator boom according to claim 2, characterized in that: The ear plate is divided into an upper part, a middle part and a lower part; The upper part of the ear plate is a "goose head" structure as a whole, and the mouth of the "goose head" structure is a gradient structure extending horizontally outward and being wide inside and narrow outside. The lower surface of the mouth of the "goose head" structure is welded to the upper surface of the upper sealing plate; The middle and lower part of the ear plate is a "sickle blade" structure as a whole, and the lower part of the "sickle blade" structure is a gradient structure that is wide at the top and narrow at the bottom. The inner side surface of the middle and lower part of the ear plate is welded to the outer side surface of the tail sealing plate; The upper part of the ear plate is provided with a hinge hole I for hingedly connecting the bucket cylinder; the hinge hole II is generally located at the middle and lower connecting bends of the ear plate, for hingedly connecting the bucket cylinder; the slotted structure I is generally located at the mouth of the "goose head" structure.

8. The excavator boom according to claim 2, characterized in that: A groove for welding is arranged at the intersection of the upper sealing plate and the tail sealing plate; and the intersection of the upper sealing plate and the tail sealing plate is in a "T"-shaped structure.

9. An excavator bucket arm, characterized in that: include: The arm body includes an upper sealing plate and a tail sealing plate; A pair of ear plates facing each other are fixed at the tail of the boom body, and a slotted structure I is provided on the ear plates. The upper sealing plate or the tail sealing plate of the boom body is inserted into the slotted structure I to form a mortise and tenon structure.

10. An excavator bucket arm, characterized in that: include: The arm body includes an upper sealing plate and a tail sealing plate; A pair of ear plates facing each other are fixed at the tail of the boom body. The upper sealing plate or the tail sealing plate of the boom body is provided with a slotted structure II. The ear plates are inserted into the slotted structure II to form a mortise and tenon structure.

11. An excavator working device, comprising an attachment, an excavator boom, and a plurality of cylinders, characterized in that: It also includes the excavator boom according to any one of claims 1 to 8; or, it also includes the excavator boom according to claim 9; or, it also includes the excavator boom according to claim 10.

12. An excavator, characterized in that: The invention comprises the excavator working device as claimed in claim 11.

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