Work machine boom front support and work machine

Abstract

The application relates to the field of working machines, and discloses a working machine boom front support and a working machine, which comprises two side plates, a bent plate welded on the inner side plate surface of the side plate connecting part of the two side plates and comprising a bent plate first plate segment, the axial two ends of the bent plate first plate segment being respectively formed with a bent plate first plate segment weld joint between the two side plates, and two outer side plate segments welded on the outer side plate surface of the side plate and comprising a plate segment rear end part, the projection of the plate segment rear end part covering the bent plate first plate segment weld joint on a projection plane perpendicular to the axial direction of the bent plate, the bent plate first plate segment weld joint being located between the upper edge of the plate segment rear end part and the first intermediate edge of the plate segment, the bent plate first plate segment weld joint being arranged at an acute angle with the upper edge of the plate segment, the plate thickness of the bent plate being t, and the distance G between the bent plate first plate segment weld joint and the first intermediate edge of the plate segment being greater than or equal to 1.5t and less than or equal to 4t. The working machine boom front support and the working machine have high structural reliability and long service life.

Description

Technical Field

[0001] This application belongs to the field of operating machinery technology, specifically relating to a boom front support for operating machinery and the operating machinery itself. Background Technology

[0002] Excavators, as a major type of construction machinery in modern times, play a vital role in production and construction, and are widely used in various infrastructure projects, large-scale engineering projects, and coal mines. The boom, as one of the three main components of the working device, is the primary load-bearing component for transmitting the forces during excavation operations. The boom front support is the foremost point of this force transmission, and therefore requires higher structural strength. Existing boom front supports lack sufficient reliability and have a short service life, hindering the reduction of excavator maintenance costs. Summary of the Invention

[0003] The purpose of this application is to provide a boom front support and operating machinery with high structural reliability and long service life.

[0004] To achieve the above objectives, this application provides a front support for the boom of a work machinery, which includes:

[0005] Two side plates are arranged in parallel and symmetrically. Each side plate includes an ear plate portion and a side plate connecting portion located behind the ear plate portion.

[0006] A bent plate, wherein the bent plate is bent circumferentially and its two ends are respectively welded to the inner side plate surface of the side plate connection portion of the two side plates, the bent plate includes a first plate segment arranged circumferentially, and the two ends of the first plate segment of the bent plate form a weld seam between the first plate segment of the bent plate and the two side plates respectively.

[0007] Two outer side plates are welded one-to-one onto the outer side surfaces of the two side plates and each includes a rear end of the plate. The edge of the rear end of the plate includes an upper edge of the plate and a first middle edge of the plate arranged opposite to each other. On a projection plane perpendicular to the axial direction of the bent plate, the projection of the rear end of the plate covers the weld of the first segment of the bent plate. The weld of the first segment of the bent plate is located between the upper edge of the plate and the first middle edge of the plate. The weld of the first segment of the bent plate is arranged at an acute angle with the upper edge of the plate. The thickness of the bent plate is t. The distance G between the weld of the first segment of the bent plate and the first middle edge of the plate is greater than or equal to 1.5t and less than or equal to 4t.

[0008] In some specific embodiments, the bending plate further includes a bending plate turning section and a bending plate second section arranged circumferentially. The bending plate first section, the bending plate turning section, and the bending plate second section are connected sequentially circumferentially. The two axial ends of the bending plate second section are respectively connected to the two side plates to form a bending plate second section weld. The rear end of the plate also includes a second middle edge and a lower edge. On a projection plane perpendicular to the axial direction of the bending plate, the projection of the rear end of the plate covers the weld of the bending plate second section. The weld of the bending plate second section is located between the lower edge of the plate and the second middle edge of the plate. The distance A between the weld of the bending plate second section and the second middle edge of the plate is greater than or equal to 1.5t and less than or equal to 4t.

[0009] In some specific embodiments, the rear end of the panel is dovetail-shaped, with the upper half of the dovetail at the rear end of the panel defined between the upper edge of the panel and the first middle edge of the panel, and the lower half of the dovetail at the rear end of the panel defined between the lower edge of the panel and the second middle edge of the panel.

[0010] In some specific embodiments, on a projection plane perpendicular to the axial direction of the bent plate, the projections of the side plate, the bent plate, and the outer side plate are arranged axially symmetrically about the central axis of the side plate, and the spacing G and the spacing A are greater than or equal to 1.5t and less than or equal to 2.75t, respectively.

[0011] Alternatively, the weld seam of the second section of the bent plate is arranged parallel to the lower edge of the plate, the spacing G is greater than or equal to 1.5t and less than or equal to 2.75t, and the spacing A is greater than or equal to 2.75t and less than or equal to 4t.

[0012] In some specific embodiments, the rear end of the plate also includes a plate bending edge connecting the first middle edge and the second middle edge of the plate. The axial ends of the bending plate segment are respectively connected to the two side plates to form bending welds. On the projection plane perpendicular to the axial direction of the bending plate, the projection of the rear end of the plate covers the bending weld. The distance B between the bending weld and the plate bending edge is greater than or equal to 1.5t and less than or equal to 4t.

[0013] And / or, the upper edge of the panel matches the upper edge of the side panel connection portion, and the lower edge of the panel matches the lower edge of the side panel connection portion.

[0014] In some specific embodiments, chamfered edges are provided between the rear end of the upper edge of the plate and the rear end of the first middle edge of the plate, and between the rear end of the second middle edge of the plate and the rear end of the lower edge of the plate. The chamfered edge located on the inner side of the rear end has a tail weld between it and the side plate. The distance between the chamfered edge located on the outer side of the rear end and the tail weld is greater than or equal to 2mm.

[0015] In some specific embodiments, the side plate includes a bent plate portion that bends inward and extends backward from the side plate connecting portion. The bent plate also includes an upper bent plate section and a lower bent plate section. The upper bent plate section extends backward from the first bent plate section to above the bent plate portion and forms a T-shaped structure with the first bent plate section. The lower bent plate section extends backward from the second bent plate section to below the bent plate portion and forms a T-shaped structure with the second bent plate section. A welding snap-fit ​​interface is provided between the web edge of the T-shaped structure and the inner edge of the wing plate. The side plate includes a snap-fit ​​welding portion that extends outward from the side plate connecting portion to the welding snap-fit ​​interface. The snap-fit ​​welding portion is arranged opposite to the inner edge of the wing plate and forms a welding slope surface with the inner edge of the wing plate respectively, so that a double-sided bevel weld can be formed between the snap-fit ​​welding portion and the inner edge of the wing plate.

[0016] In some specific embodiments, the distance between the outer edge of the welding ramp surface of the inner edge of the wing plate and the plate surface of the upper plate segment of the curved plate is less than the distance between the outer edge of the welding ramp surface of the snap-fit ​​weld and the plate surface of the upper plate segment of the curved plate. The angle E between the welding ramp surface of the inner edge of the wing plate and the straight line perpendicular to the plate surface of the upper plate segment of the curved plate is greater than or equal to 15° and less than or equal to 25°. The angle F between the welding ramp surface of the snap-fit ​​weld and the welding ramp surface of the inner edge of the wing plate is greater than or equal to 45° and less than or equal to 65°.

[0017] In some specific embodiments, the inner surfaces of the upper and lower sections of the bent plate are welded to the upper and lower ends of the two opposing bent plate portions to define a structural reinforcement cavity. The front support of the boom of the working machine also includes an inner support plate, which is welded to the upper section of the bent plate, the lower section of the bent plate, and the two bent plate portions to divide the structural reinforcement cavity into a front reinforcement cavity and a rear reinforcement cavity.

[0018] The distance C between the inner support plate and the front end of the bent plate is greater than or equal to 35 mm and less than or equal to 100 mm, and the distance D between the inner support plate and the rear end of the bent plate is greater than or equal to 35 mm and less than or equal to 100 mm.

[0019] And / or, the distance C between the inner support plate and the front end of the bent plate portion and the distance D between the inner support plate and the rear end of the bent plate portion are equal.

[0020] A second aspect of this application provides a working machine that includes the aforementioned working machine boom front support.

[0021] Through the above technical solution, the rear end of the outer plate is designed in a dovetail shape. The axial projection of the rear end of the dovetail-shaped plate covers the weld seam of the first segment of the bent plate, the bend weld seam of the bent plate, and the weld seam of the second segment of the bent plate. This allows the outer plate to enhance welding strength and eliminate weld stress. Furthermore, the distance G between the weld seam of the first segment of the bent plate and the first middle edge of the plate is set to be greater than or equal to 1.5t and less than or equal to 4t. This means that the weld seam between the rear end of the plate and the side plate can generate opposite welding deformation stress to the weld seam of the first segment of the bent plate, thereby achieving the purpose of generating equal opposite stresses to cancel each other out. This enhances the weld strength of the front support of the boom of the working machinery, reduces the risk of weld cracking, and makes the structure of the front support of the boom of the working machinery more reliable and longer in service life.

[0022] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0024] Figure 1 A partial structural schematic diagram of the front support of the boom of a work machinery according to a specific embodiment of this application is shown;

[0025] Figure 2 It shows Figure 1 A top view of the front support of the boom of the working machinery in the middle;

[0026] Figure 3 It shows Figure 2 Enlarged view of the structure at position I;

[0027] Figure 4 It shows Figure 2 A cross-sectional view at position AA in the middle;

[0028] Figure 5 It shows Figure 1 A front view of the boom front support of the working machinery in the figure, showing the weld between the bending plate and the side plate;

[0029] Figure 6 It shows Figure 5 Enlarged sectional view of the partial structure at position II;

[0030] Figure 7 A front view of the front support of the boom of a work machinery according to another specific embodiment of this application is shown, and the weld between the bending plate and the side plate is illustrated.

[0031] Figure 8 A front view of the front support of the boom of a work machinery according to another specific embodiment of this application is shown, and the weld between the bending plate and the side plate is illustrated.

[0032] Figure 9 It shows Figure 1 A schematic diagram of stress analysis of the front support of the boom of the operating machinery in the diagram;

[0033] Figure 10 A schematic diagram of stress analysis of the boom front support in the prior art is shown.

[0034] Explanation of reference numerals in the attached figures

[0035] 1 Side plate 11 Ear plate section

[0036] 12 Side plate connecting part 121 Snap-fit ​​welding part

[0037] 122 Double-sided bevel weld; 13 Bent plate section

[0038] 2. Bend plate 21. First segment of bend plate

[0039] 211 Weld of the first section of the bent plate 22 Weld of the bending section of the bent plate

[0040] 221 Bending weld of bent plate; 23 Second section of bent plate.

[0041] 231 Weld of the second section of the bent plate 24 Upper section of the bent plate

[0042] 25 Lower section of the curved plate 261 Inner edge of the flange

[0043] 262 Welding Card Interface 3 Outer Side Panel

[0044] 31 Top edge of the panel 32 First middle edge of the panel

[0045] 33. Bent edge of the panel 34. Second middle edge of the panel

[0046] 35. Lower edge of the panel; 36. Beveled edge.

[0047] 361 Tail weld 4 Inner support plate

[0048] 5. Earplate inner plate Detailed Implementation

[0049] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0050] Taking excavators as an example of construction machinery, the working device of an excavator mainly includes three major components: the boom, the stick, and the bucket. The front support of the boom is the foremost point of the boom that bears the load and transmits force, and it bears a large force, requiring high structural strength. Due to insufficient strength, the front support of the boom in existing excavators has a short service life and often cracks and fails, resulting in high maintenance costs and low work efficiency for excavators.

[0051] In view of this, such as Figure 1 , Figure 2 and Figure 4 As shown, this application provides a front support for a boom of a work machinery, which includes two side plates 1, a curved plate 2, and two outer side plates 3. The two side plates 1 are arranged in parallel and symmetrically, and each side plate 1 includes a lug portion 11 and a side plate connecting portion 12 located behind the lug portion 11. The curved plate 2 is bent circumferentially and its two axial ends are respectively welded to the inner side plate surface of the side plate connecting portion 12 of the two side plates 1. The circumferential opening of the curved plate 2 is arranged facing rearward, and the two outer side plates 3 are welded to the outer side plate surfaces of the two side plates 1 in a one-to-one correspondence.

[0052] like Figure 4 As shown, the bending plate 2 includes a first bending plate segment 21, a bending plate turning segment 22, and a second bending plate segment 23 arranged circumferentially and connected in sequence. The two axial ends of the first bending plate segment 21, the two axial ends of the bending plate turning segment 22, and the two axial ends of the second bending plate segment 23 are respectively welded to the inner side plate surface of the side plate connecting part 12 of the two side plates 1. The two axial ends of the first bending plate segment 21 form a first bending plate segment weld 211 with the two side plates 1. The two axial ends of the second bending plate segment 23 form a second bending plate segment weld 231 between the two side plates 1. The two axial ends of the bending plate turning segment 22 form a bending plate turning weld 221 between the two side plates 1.

[0053] like Figure 5 , Figure 7 and Figure 8As shown, the two outer side plates 3 each include a front end and a rear end. The front end of the plate matches and is fitted with the ear plate portion 11 of the side plate 1. The upper edge of the rear end of the plate includes an upper upper edge 31 and a first middle edge 32 of the plate arranged opposite to each other. On the projection plane perpendicular to the axial direction of the bent plate 2, the projection of the rear end of the plate covers the weld seam 211 of the first plate segment of the bent plate. The weld seam 211 of the first plate segment of the bent plate is located between the upper upper edge 31 and the first middle edge 32 of the plate. The weld seam 211 of the first plate segment of the bent plate and the upper upper edge 31 of the plate are arranged at an acute angle. The thickness of the bent plate 2 is t. The distance G between the weld seam 211 of the first plate segment of the bent plate and the first middle edge 32 of the plate is greater than or equal to 1.5t and less than or equal to 4t. Wherein, the distance G is the minimum distance between any point on the weld seam 211 of the first plate segment of the bent plate and the first middle edge 32 of the plate.

[0054] Since the upper edge 31 and the first middle edge 32 of the plate are respectively formed with the outer side plate surface of the side plate connection part 12, the projection of the rear end of the plate covers the weld 211 of the first segment of the bent plate. The weld 211 of the first segment of the bent plate is located between the upper edge 31 of the plate and the first middle edge 32 of the plate. This helps to generate opposite welding deformation stress between the weld of the bent plate and the weld of the plate, thereby achieving the purpose of generating equal opposite stress to cancel each other out, and can enhance the weld strength and reduce the risk of weld cracking.

[0055] Specifically, by setting the distance G between the weld 211 of the first segment of the bent plate and the first middle edge 32 of the plate to be greater than or equal to 1.5t, problems such as excessive welding deformation and excessive stress concentration caused by the excessively close distance between the weld 211 of the first segment of the bent plate and the weld on the first middle edge 32 of the plate can be avoided, which would affect the structural strength of the weld. Furthermore, setting the distance G between the weld 211 of the first segment of the bent plate and the first middle edge 32 of the plate to be less than or equal to 4t ensures that the outer plate 3 can effectively enhance the welding strength of the bent plate and eliminate stress in the weld. Through comparison... Figure 9 and Figure 10 Stress analysis shows that, Figure 9 The stress value near weld 211 in the first section of the bent plate is higher than that in the bending plate. Figure 10 The stress value near the corresponding weld should be low.

[0056] In some specific implementations, such as Figure 5 , Figure 7 and Figure 8As shown, the rear end of the plate may further include a second intermediate edge 34 and a lower edge 35 of the plate. The second intermediate edge 34 and the lower edge 35 of the plate form a plate weld with the outer surface of the side plate connecting portion 12, respectively. On a projection plane perpendicular to the axial direction of the bent plate 2, the projection of the rear end of the plate covers the weld 231 of the second segment of the bent plate. The weld 231 of the second segment of the bent plate is located between the lower edge 35 and the second intermediate edge 34 of the plate. The distance A between the weld 231 of the second segment of the bent plate and the second intermediate edge 34 of the plate is greater than or equal to 1.5t and less than or equal to 4t. Similarly, this allows the weld 231 of the bent plate and the weld 231 of the plate to generate opposite welding deformation stresses, thereby achieving the purpose of generating equal opposite stresses to cancel each other out, and enhancing the weld strength while reducing the risk of weld cracking. The distance A is the minimum distance between any point on the weld 231 of the second segment of the bent plate and the second intermediate edge 34 of the plate.

[0057] Optionally, the upper edge 31 of the panel matches the upper edge of the side panel connecting portion 12, and the lower edge 35 of the panel matches the lower edge of the side panel connecting portion 12. The rear end of the panel can be dovetail-shaped, with the upper half of the dovetail at the rear end of the panel defined between the upper edge 31 of the panel and the first intermediate edge 32 of the panel, and the lower half of the dovetail at the rear end of the panel defined between the lower edge 35 of the panel and the second intermediate edge 34 of the panel. This makes the structure of the outer panel 3 simpler and more reasonable.

[0058] In some specific implementations, such as Figure 5 and Figure 7 As shown, on the projection plane perpendicular to the axis of the bent plate 2, the projections of the side plate 1, the bent plate 2, and the outer side plate 3 are arranged axially symmetrically about the central axis of the side plate 1. At this time, to further enhance the structural strengthening effect of the weld, the spacing G and the spacing A are set to be greater than or equal to 1.5t and less than or equal to 2.75t, respectively. Through comparison... Figure 9 and Figure 10 Stress analysis shows that, Figure 9 The stress value near weld 231 in the second section of the bent plate is higher than that in the middle. Figure 10 The stress value near the corresponding weld should be low.

[0059] In other specific implementations, such as Figure 8 As shown, the weld 231 of the second segment of the bent plate is arranged parallel to the lower edge 35 of the outer plate. At this point, the structures of the side plate 1, the bent plate 2, and the outer outer plate 3 are not symmetrical. To further enhance the structural reinforcement effect of the weld, the spacing G can be set to greater than or equal to 1.5t and less than or equal to 2.75t, and the spacing A can be set to greater than or equal to 2.75t and less than or equal to 4t. This will further reduce the occurrence of uneven stress distribution in the overall weld caused by excessive stress concentration.

[0060] Furthermore, the rear end of the plate may also include a plate bending edge 33 connecting the first intermediate edge 32 and the second intermediate edge 34 of the plate, and a plate weld is formed between the plate bending edge 33 and the outer surface of the side plate connecting part 12. On the projection plane perpendicular to the axial direction of the bent plate 2, the projection of the rear end of the plate covers the bent plate bending weld 221, and the distance B between the bent plate bending weld 221 and the plate bending edge 33 is greater than or equal to 1.5t and less than or equal to 4t. In this way, the bent plate weld and the plate weld can be further made to generate opposite welding deformation stresses, thereby achieving the purpose of generating equal opposite stresses to cancel each other out, and enhancing the weld strength and reducing the risk of weld cracking. Wherein, the distance B is the minimum distance between any point on the bent plate bending weld 221 and the plate bending edge 33. By comparison Figure 9 and Figure 10 Stress analysis shows that, Figure 9 The stress value near the bend weld 221 in the bent plate is higher than that in the bending weld. Figure 10 The stress value near the corresponding weld should be low.

[0061] Optionally, in order to make the weld seam at the rear end of the plate approximately dovetail-shaped, so as to disperse and reduce weld stress, such as Figure 1 and Figure 3 As shown, a chamfered edge 36 is provided between the rear end of the upper edge 31 of the plate and the rear end of the first middle edge 32 of the plate, and a chamfered edge 36 is also provided between the rear end of the second middle edge 34 of the plate and the rear end of the lower edge 35 of the plate. The chamfered edge 36 has a tail weld 361 between its inner rear edge and the side plate 1, and the distance between the chamfered edge 36's outer rear edge and the tail weld 361 is greater than or equal to 2 mm. The axial projection of the outer contour of the rear end of the chamfered edge 36 can be an arc shape or a rounded square shape, etc.

[0062] Furthermore, such as Figure 1 As shown, the side plate 1 may include a bent plate portion 13 that bends inward and extends rearward from the side plate connecting portion 12. The bent plate 2 also includes an upper bent plate section 24 and a lower bent plate section 25. The upper bent plate section 24 extends rearward from the first bent plate section 21 to above the bent plate portion 13 and forms a T-shaped structure with the first bent plate section 21. The lower bent plate section 25 extends rearward from the second bent plate section 23 to below the bent plate portion 13 and forms a T-shaped structure with the second bent plate section 23. A welding snap-fit ​​interface 262 is sandwiched between the web edge of the T-shaped structure and the inner edge 261 of the flange. The side plate 1 includes a snap-fit ​​welding portion 121 that extends outward from the side plate connecting portion 12 to the welding snap-fit ​​interface 262. The snap-fit ​​welding portion 121 and the inner edge 261 of the flange are arranged opposite each other and form a bevel weld.

[0063] The existing excavator boom front support snap-fit ​​weld 121 and the inner edge of the wing plate 261 uses a single-sided vertical bevel butt weld. In actual welding, it may not be possible to guarantee root penetration, and it is also easy to cause uneven stress on the weld, which will reduce the welding strength and make the weld prone to cracking in the later stage.

[0064] To reduce stress in the bevel weld at this location and avoid fatigue life issues such as weld tearing later on, such as... Figure 1 and Figure 6 As shown, the snap-fit ​​welding part 121 and the inner edge part 261 of the flange can each be formed with a welding slope surface, so as to form a double-sided bevel weld 122 between the snap-fit ​​welding part 121 and the inner edge part 261 of the flange. In this way, it can ensure a greater degree of root penetration and make the stress on both sides of the weld more uniform.

[0065] Furthermore, in the T-shaped structure on the upper plate segment 24 of the curved plate, the distance between the outer edge of the welding ramp surface of the inner edge portion 261 of the flange and the plate surface of the upper plate segment 24 of the curved plate is less than the distance between the outer edge of the welding ramp surface of the snap-fit ​​welding portion 121 and the plate surface of the upper plate segment 24 of the curved plate, that is, there is a height difference between the welding ramp surface of the snap-fit ​​welding portion 121 and the welding ramp surface of the inner edge portion 261 of the flange. At this time, the angle E between the welding ramp surface of the inner edge portion 261 of the flange and the straight line perpendicular to the plate surface of the upper plate segment 24 of the curved plate can be set to greater than or equal to 15° and less than or equal to 25°, and the angle F between the welding ramp surface of the snap-fit ​​welding portion 121 and the welding ramp surface of the inner edge portion 261 of the flange can be set to greater than or equal to 45° and less than or equal to 65°. In this way, the double-sided bevel welding can ensure a greater degree of root penetration and make the stress on both sides of the weld more uniform. By comparison Figure 9 and Figure 10 Stress analysis shows that, Figure 9 The stress value near the double-groove weld 122 is higher than that of the double-groove weld 122. Figure 10 The stress value near the corresponding weld should be low.

[0066] Similarly, in the T-shaped structure on the lower section 25 of the bent plate, the distance between the outer edge of the welding ramp surface of the inner edge portion 261 of the flange and the plate surface of the lower section 25 of the bent plate is less than the distance between the outer edge of the welding ramp surface of the snap-fit ​​welding portion 121 and the plate surface of the lower section 25 of the bent plate, that is, there is a height difference between the welding ramp surface of the snap-fit ​​welding portion 121 and the welding ramp surface of the inner edge portion 261 of the flange. At this time, the angle E between the welding ramp surface of the inner edge portion 261 of the flange and the straight line perpendicular to the plate surface of the lower section 25 of the bent plate can be set to greater than or equal to 15° and less than or equal to 25°, and the angle F between the welding ramp surface of the snap-fit ​​welding portion 121 and the welding ramp surface of the inner edge portion 261 of the flange can be set to greater than or equal to 45° and less than or equal to 65°. In this way, the double-sided bevel welding can ensure a greater degree of root penetration and make the stress on both sides of the weld more uniform.

[0067] Optionally, the inner side of the upper plate section 24 of the bending plate and the inner side of the lower plate section 25 of the bending plate are welded to the upper and lower ends of the two opposite bending plate portions 13 to define the structural reinforcement cavity. The front support of the boom of the working machine also includes an inner support plate 4, which is welded to the upper plate section 24 of the bending plate, the lower plate section 25 of the bending plate and the two bending plate portions 13 to divide the structural reinforcement cavity into a front reinforcement cavity and a rear reinforcement cavity.

[0068] In designing the positioning of the inner support plate 4, it is necessary to ensure that the positioning of the inner support plate 4 is not too far forward or too far back. The distance C between the inner support plate 4 and the front end of the bent plate part 13 and the distance D between the inner support plate 4 and the rear end of the bent plate part 13 can be set to be equal, or the difference between the distance C and the distance D can be set to be less than or equal to 10mm. This ensures that the fillet weld of the side plate 1 and the bent plate 2 is more evenly stressed on both sides of the inner support plate 4, reducing the amount of welding deformation at this point. (Comparison...) Figure 9 and Figure 10 Stress analysis shows that, Figure 9 The stress value near the weld of the inner support plate 4 is higher than that of the inner support plate 4. Figure 10 The stress value near the weld of the inner support plate should be low.

[0069] Furthermore, the distance C between the inner support plate 4 and the front end of the bent plate portion 13 is greater than or equal to 35 mm and less than or equal to 100 mm, and the distance D between the inner support plate 4 and the rear end of the bent plate portion 13 is greater than or equal to 35 mm and less than or equal to 100 mm. This ensures sufficient weld distance between the front and rear ends of the inner support plate 4. If the distances C and D are less than 35 mm, the weld length between the side plate 1 and the bent plate 2 may be too small, resulting in insufficient structural strength. If the distances C and D are greater than 100 mm, the butt weld distance between the front support of the boom and the front side plate of the boom will be too large, which will affect the load-bearing capacity of the overall boom at this butt weld.

[0070] Optionally, the 10mm to 30mm range of the rear end of the welding gap between the two ends of the bent plate portion 13 and the inner side plates of the upper plate section 24 and the lower plate section 25 of the bent plate is left unwelded. This can prevent more stress deformation from occurring at the cut edge of the weld at the tail end. In other words, leaving a gap at the tail end junction without welding not only reduces welding deformation by not cutting the weld edge, but also avoids the problem of welding quality not being guaranteed due to abrupt structural changes at the tail end junction.

[0071] Optionally, the front support of the boom of the working machine includes two inner plates 5 of the ear plate, which are welded to the inner side plate surface of the ear plate portion 11 of the two side plates 1.

[0072] Another aspect of this application provides a working machine that includes the aforementioned working machine boom front support. Since the working machine includes the aforementioned working machine boom front support, it possesses all the technical effects brought about by the working machine boom front support, which will not be elaborated further here. This working machine can be a front shovel excavator, wheeled excavator, backhoe excavator, tunnel excavator, multi-functional excavator, or dredging vessel, etc., for excavation work.

[0073] In summary, the front support structure of the boom of the operating machinery in this application is more reasonable, and the stress distribution is improved. The outer plate adopts a dovetail structure protruding along the curved contour of the curved plate, which can reduce the weld stress of the curved plate and the outer plate, and is a structural form that can mutually offset weld stress deformation. In addition, the dovetail end of the outer plate has a chamfered edge, making the tail weld more similar to a dovetail shape, thereby achieving the purpose of dispersing and reducing weld stress. Furthermore, the bevel weld between the side plate and the curved plate adopts a double-sided bevel weld, which can ensure a greater degree of root penetration and make the stress on both sides of the weld more even. Moreover, the positioning position of the inner support plate is taken at the middle position of the butt joint weld between the front support side plate and the curved plate, and the distance between the two sides is controlled within the range of 35mm to 100mm as much as possible. This can ensure the load-bearing capacity of the weld while ensuring that the stress on both sides of the butt joint weld between the side plate and the curved plate is more even, reducing the amount of welding deformation at this point.

[0074] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0075] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A front support for the boom of a work machinery, characterized in that, include: Two side plates (1) are arranged in parallel and symmetrically. The side plate (1) includes an ear plate portion (11) and a side plate connecting portion (12) located behind the ear plate portion (11). A bent plate (2), the bent plate (2) is bent circumferentially and its two ends are respectively welded to the inner side plate surface of the side plate connecting part (12) of the two side plates (1), the bent plate (2) includes a first plate segment (21) arranged circumferentially, and the two ends of the first plate segment (21) are respectively connected to the two side plates (1) by weld seams (211); and Two outer side plates (3) are welded one-to-one on the outer side plates of the two side plates (1) and each includes a rear end of the plate. The edge of the rear end of the plate includes an upper upper edge (31) and a first middle edge (32) of the plate arranged opposite to each other. On the projection plane perpendicular to the axial direction of the bent plate (2), the projection of the rear end of the plate covers the weld seam (211) of the first plate segment of the bent plate. The weld seam (211) of the first plate segment of the bent plate is located between the upper upper edge (31) of the plate and the first middle edge (32) of the plate. The weld seam (211) of the first plate segment of the bent plate and the upper upper edge (31) of the plate are arranged at an acute angle. The plate thickness of the bent plate (2) is t. The distance G between the weld seam (211) of the first plate segment of the bent plate and the first middle edge (32) of the plate is greater than or equal to 1.5t and less than or equal to 4t.

2. The front support of the boom of the working machinery according to claim 1, characterized in that, The bent plate (2) further includes a bent plate bending section (22) and a bent plate second section (23) arranged circumferentially. The bent plate first section (21), the bent plate bending section (22) and the bent plate second section (23) are connected sequentially circumferentially. The two ends of the bent plate second section (23) form a bent plate second section weld (231) between the two side plates (1) respectively. The rear end of the plate also includes a second middle edge (34) and a lower edge (35). On the projection plane perpendicular to the axial direction of the bent plate (2), the projection of the rear end of the plate covers the weld (231) of the bent plate second section. The weld (231) of the bent plate second section is located between the lower edge (35) and the second middle edge (34) of the plate. The distance A between the weld (231) of the bent plate second section and the second middle edge (34) of the plate is greater than or equal to 1.5t and less than or equal to 4t.

3. The front support of the boom of the working machinery according to claim 2, characterized in that, The rear end of the panel is dovetail-shaped. The upper half of the dovetail at the rear end of the panel is defined between the upper edge (31) of the panel and the first middle edge (32) of the panel. The lower half of the dovetail at the rear end of the panel is defined between the lower edge (35) of the panel and the second middle edge (34) of the panel.

4. The front support of the boom of the working machinery according to claim 2, characterized in that, On the projection plane perpendicular to the axial direction of the bent plate (2), the projections of the side plate (1), the bent plate (2) and the outer side plate (3) are arranged symmetrically about the central axis of the side plate (1), and the spacing G and the spacing A are greater than or equal to 1.5t and less than or equal to 2.75t, respectively. Alternatively, the weld seam (231) of the second plate segment of the bent plate is arranged parallel to the lower edge (35) of the plate, the spacing G is greater than or equal to 1.5t and less than or equal to 2.75t, and the spacing A is greater than or equal to 2.75t and less than or equal to 4t.

5. The front support of the boom of the working machinery according to claim 2, characterized in that, The rear end of the plate also includes a plate bending edge (33) connecting the first middle edge (32) and the second middle edge (34) of the plate. The two ends of the bending plate section (22) form bending welds (221) between the two side plates (1) respectively. On the projection plane perpendicular to the axis of the bending plate (2), the projection of the rear end of the plate covers the bending weld (221). The distance B between the bending weld (221) and the plate bending edge (33) is greater than or equal to 1.5t and less than or equal to 4t. And / or, the upper edge (31) of the panel matches the upper edge of the side panel connecting part (12), and the lower edge (35) of the panel matches the lower edge of the side panel connecting part (12).

6. The front support of the boom of the working machinery according to claim 2, characterized in that, A chamfered edge (36) is provided between the rear end of the upper edge (31) of the plate and the rear end of the first middle edge (32) of the plate, and between the rear end of the second middle edge (34) of the plate and the rear end of the lower edge (35) of the plate. The chamfered edge (36) located on the inner side of the rear end has a tail weld (361) between it and the side plate (1). The distance between the chamfered edge (36) located on the outer side of the rear end and the tail weld (361) is greater than or equal to 2 mm.

7. The front support of the boom of the working machinery according to claim 2, characterized in that, The side plate (1) includes a bent plate portion (13) that bends inward and extends rearward from the side plate connecting portion (12). The bent plate (2) also includes an upper bent plate section (24) and a lower bent plate section (25). The upper bent plate section (24) extends rearward from the first bent plate section (21) to above the bent plate portion (13) and forms a T-shaped structure with the first bent plate section (21). The lower bent plate section (25) extends rearward from the second bent plate section (23) to below the bent plate portion (13) and forms a T-shaped structure with the second bent plate section (23). A welding clamping interface (262) is provided between the web edge of the T-shaped structure and the inner edge of the wing plate (261). The side plate (1) includes a snap-fit ​​welding part (121) extending outward from the side plate connecting part (12) to the welding clamping interface (262). The snap-fit ​​welding part (121) and the inner edge of the wing plate (261) are arranged opposite to each other and form welding slope surfaces with the inner edge of the wing plate (261) respectively, so that a double-sided bevel weld (122) can be formed between the snap-fit ​​welding part (121) and the inner edge of the wing plate.

8. The front support of the boom of the working machinery according to claim 7, characterized in that, The distance between the outer edge of the welding ramp surface of the inner edge portion (261) of the wing plate and the plate surface of the upper plate section (24) of the curved plate is less than the distance between the outer edge of the welding ramp surface of the snap-fit ​​welding part (121) and the plate surface of the upper plate section (24) of the curved plate. The angle E between the welding ramp surface of the inner edge portion (261) of the wing plate and the straight line perpendicular to the plate surface of the upper plate section (24) of the curved plate is greater than or equal to 15° and less than or equal to 25°. The angle F between the welding ramp surface of the snap-fit ​​welding part (121) and the welding ramp surface of the inner edge portion (261) of the wing plate is greater than or equal to 45° and less than or equal to 65°.

9. The front support of the boom of the working machinery according to claim 7, characterized in that, The inner side surfaces of the upper plate section (24) and the lower plate section (25) of the bent plate are welded to the upper and lower ends of the two opposing bent plate portions (13) to define a structural reinforcement cavity. The front support of the working machine boom also includes an inner support plate (4). The inner support plate (4) is welded to the upper plate section (24), the lower plate section (25), and the two bent plate portions (13) to divide the structural reinforcement cavity into a front reinforcement cavity and a rear reinforcement cavity. The distance C between the inner support plate (4) and the front end of the bent plate part (13) is greater than or equal to 35 mm and less than or equal to 100 mm, and the distance D between the inner support plate (4) and the rear end of the bent plate part (13) is greater than or equal to 35 mm and less than or equal to 100 mm. And / or, the distance C between the inner support plate (4) and the front end of the bent plate portion (13) and the distance D between the inner support plate (4) and the rear end of the bent plate portion (13) are equal.

10. A type of operating machinery, characterized in that, Includes the front support of the boom of the operating machinery according to any one of claims 1 to 9.

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