Front frame of loading machine

Abstract

The front frame of the loading machine comprises a left wing box and a right wing box which are symmetrically arranged left and right, each of the left wing box and the right wing box comprises an outer side plate and an inner side plate which are arranged in parallel, a middle beam frame is connected between the upper portions of the two inner side plates, and the front end of the middle beam frame is connected with a front cover plate located between the two inner side plates. The rear end of the middle beam frame is provided with an up-down hinged welding assembly connected between the two inner side plates. The up-down hinged welding assembly comprises an upper hinged plate, a lower hinged plate and a welding plate. According to the utility model, the hinged plate which is most easily damaged on the front frame of the loading machine is designed into a vertically hinged and welded form, so that the structural strength of the front frame of the loading machine is greatly enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of loaders, and particularly relates to a front frame of a loader. Background Art

[0002] The statements herein only provide background art related to the present utility model and do not necessarily constitute prior art.

[0003] In the technical field of loaders, the front frame of a loader, as the core infrastructure for supporting and stabilizing the working device, is subjected to complex mechanical forces from all directions during operation, including but not limited to tensile, compressive, bending, torsional, and sudden impact loads. These extreme mechanical conditions pose severe challenges to the strength and durability of the front frame, especially in special positions such as hinge plates, bridge supports, and front crossbeams, which are more prone to damage; this also poses more rigorous and high-standard strength requirements for the design of the front frame of a loader.

[0004] In order to enhance the structural strength of the front frame of a loader, those skilled in the art have proposed various design methods, but the inventor has found that there are still some technical problems in the existing design methods, such as:

[0005] (1) For a design of the front frame of a loader provided by Patent CN201738365U, a support plate is arranged on the inner walls of two inner side plates to connect with the upper hinge plate, and the stress received by the two inner side plates is diffused to the upper hinge plate through a rib plate to enhance the stress-bearing capacity. However, the distance between the hinge plate and the support plate is too large, and when the hinge plate is stressed, the rib plate cannot diffuse the stress to other positions and can only digest it by its own stiffness. Therefore, the consideration of the stress-bearing scenario of the hinge plate is lacking, resulting in a general effect in enhancing the structural strength of the front frame of a loader.

[0006] (2) For a front frame of a loader provided by Patent CN216709432U, a tail plate with a width gradually narrowing from front to back is connected to the rear end of the front axle fixing bracket and is connected to the inner side plate. Both the fixing bracket and the enclosing plate are connected to the inner side plate. Although it can share the stress to a certain extent when there is a single fixing bracket, both the planar fixing bracket and the tail plate have limited structural strength. Therefore, its effect in enhancing the structural strength of the front frame of a loader is also general. Content of the Utility Model

[0007] The purpose of the present utility model is to provide a front frame of a loader, which includes a left wing box and a right wing box symmetrically arranged on the left and right. Both the left wing box and the right wing box include an outer side plate and an inner side plate arranged in parallel. A middle beam frame is connected between the upper parts of the two inner side plates. The front end of the middle beam frame is connected with a front cover plate located between the two inner side plates, and the rear end of the middle beam frame is provided with an upper and lower hinge welding assembly connected between the two inner side plates;

[0008] The upper and lower articulated welding assembly includes an upper articulated plate, a lower articulated plate and a welding plate, and the upper articulated plate and the lower articulated plate are connected by the welding plate; the upper articulated plate includes two bent plates, the front ends of the two bent plates are horizontally arranged and the middle parts are hollowed out, and the rear ends of the two bent plates extend in opposite directions and the bottoms are open; the lower articulated plate is a flat plate in an approximate convex shape, a round hole perpendicular to the hollowed-out front end of the upper articulated plate is opened at the front end of the lower articulated plate, and elliptical round holes symmetrically distributed left and right are opened at the rear end of the lower articulated plate.

[0009] Further, the middle beam frame includes a cross tube, a front cover plate, and two front cross beams; the front cross beam includes a first ear plate and a second ear plate.

[0010] Furthermore, the first ear plate is in a slide shape, and the lower end of the first ear plate is welded to the upper part of the front cover plate; the second ear plate is in a spoon hook shape, and the lower end of the second ear plate is welded to the upper part of the cross tube.

[0011] A front frame of a loader provided by the present utility model further includes a pair of symmetrically distributed bridge supports; the upper parts of the fronts of the two bridge supports are respectively welded to the lower parts of the fronts of the two inner side plates.

[0012] Further, the bridge support includes a fixing plate, a bottom plate and a tail plate; the lower end of the fixing plate is connected to the side of the bottom plate.

[0013] Furthermore, the fixing plate is in an approximate triangular shape and the outer side thereof is welded to the outer side of the inner side plate; the tail plate is in a fish tail shape with both sides rolled up and the lower end folded outwards; and the front end of the tail plate is connected to the rear ends of the fixing plate and the bottom plate, and one end of the tail plate on the same side as the fixing plate is welded to the inner side plate; two rows of mounting holes, a first reinforcing rib plate and a second reinforcing rib plate are arranged on the bottom plate.

[0014] Advantages of the above one or more technical solutions:

[0015] (1) In the present utility model, an upper and lower articulated welding assembly connected between the two inner side plates is provided at the rear end of the middle beam frame, and the upper and lower articulated welding assembly includes an upper articulated plate, a lower articulated plate and a welding plate. The present utility model does not require a support plate to connect the upper articulated frame, and naturally does not need to add redundant rib plates at this part; therefore, potential stress concentration points are reduced; in addition, when the articulated plate is subjected to forces from all directions, the articulated welding design of the upper and lower articulated plates allows a certain degree of relative movement, which helps to better disperse and absorb stress when subjected to impact or vibration; furthermore, the distribution of the welding joints can be optimized according to the stress conditions to achieve a more uniform stress distribution.

[0016] (2) In the bridge support designed by the present utility model, a reinforcing rib plate in the shape of an arc-edge triangular box is arranged between the front fixing plate and the side plate, and the tail plate is in the shape of a fish tail with both sides rolled up and the lower end folded outwards. Compared with the planar fixing bracket and tail plate, this structural design can enhance its own structural strength while transferring the stress received by the bridge support from the weld where structural damage is most likely to occur to the arc edge and the fish tail end, greatly enhancing the supporting capacity of the bridge support, and further enhancing the structural strength of the entire front frame of the loader. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation to this application.

[0018] Figure 1 It is a schematic diagram of the overall structure of the front frame of the loader of the present utility model.

[0019] Figure 2 It is a schematic diagram of the upper hinge welding structure of the present utility model.

[0020] Figure 3 It is a schematic diagram of the lower hinge welding structure of the present utility model.

[0021] Figure 4 It is a schematic diagram of the front crossbeam structure of the present utility model.

[0022] Figure 5 It is a schematic diagram of the bridge support structure of the present utility model.

[0023] In the figure, 1 is the left wing box; 2 is the right wing box; 3 is the outer side plate; 4 is the inner side plate; 5 is the middle beam frame; 6 is the front cover plate; 7 is the upper and lower hinge welding assembly; 71 is the upper hinge plate; 72 is the lower hinge plate; 73 is the welding plate; 8 is the cross tube; 9 is the front cover plate; 10 is the front crossbeam; 101 is the first opening; 102 is the second opening; 103 is the reinforcing rib; 104 is the first ear plate; 105 is the second ear plate; 11 is the bridge support; 111 is the fixing plate; 112 is the bottom plate; 113 is the tail plate; 114 is the first reinforcing rib; 115 is the second reinforcing rib; 116 is the mounting hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will describe the specific implementation manners of this embodiment in conjunction with the attached Figures 1-5 , and explain the specific implementation manners of this embodiment.

[0025] As Figure 1As shown in the figure, the present utility model provides a front frame of a loader, which includes left and right wing boxes arranged symmetrically. The left wing box and the right wing box both include an outer plate and an inner plate arranged in parallel. A middle beam frame is connected between the upper parts of the two inner plates. The front end of the middle beam frame is connected with a front cover plate located between the two inner plates. The rear end of the middle beam frame is provided with an upper and lower articulated welding assembly connected between the two inner plates;

[0026] As Figure 2 and Figure 3 shown, the upper and lower articulated welding assembly includes an upper articulated plate, a lower articulated plate and a welding plate. The upper articulated plate and the lower articulated plate are connected by the welding plate; the upper articulated plate includes two bent plates. The front ends of the two bent plates are horizontally arranged and the middle parts are hollowed out. The rear ends of the two bent plates extend in opposite directions and the bottoms are open; the sides of the two bent plates are welded to the two inner plates. The lower articulated plate is an approximately convex flat plate. A round hole perpendicular to the hollowed-out front end of the upper articulated plate is opened at the front end of the lower articulated plate. Elliptical round holes symmetrically distributed left and right are opened at the rear end of the lower articulated plate; the side of the lower articulated plate is welded to the inner plate.

[0027] Through the design of the upper and lower articulated welding assembly, potential stress concentration points can be reduced; in addition, when the articulated plate is subjected to forces from all directions, the articulated welding design of the upper and lower articulated plates allows a certain degree of relative movement, which helps to better disperse and absorb stress when subjected to impact or vibration; furthermore, the distribution of the welding joints can be optimized according to the force conditions to achieve a more uniform stress distribution.

[0028] The middle beam frame includes a cross tube, a front cover plate, and two front cross beams.

[0029] Furthermore, the rear end of the front cover plate is welded to the front end of the cross tube, and the front end of the front cover plate is welded to the rear end of the front cover plate; the two front cross beams are arranged at intervals along the length direction of the cross tube.

[0030] As Figure 4 shown, the upper and lower ends of the front cross beam are respectively provided with a first opening and a second opening;

[0031] Among them, the first opening is used to connect the tipping cylinder; the inside of the second opening is an approximately triangular cavity, and three reinforcing ribs are included in the cavity; the reinforcing ribs are arranged at intervals and perpendicularly along the length direction of the bottom edge of the cavity.

[0032] The utility model reasonably designs two openings; among them, the first opening is adapted to the tipping cylinder, and the second opening, on the one hand, reduces the overall weight of the front crossbeam through a cavity design, and on the other hand, enhances the structural strength of the front crossbeam through three reinforcing ribs, thereby providing greater force-bearing support for the entire front frame of the loader.

[0033] Furthermore, the front crossbeam further includes a first ear plate and a second ear plate.

[0034] Furthermore, the front crossbeam is a casting; among them, the first ear plate is in the shape of a slide, and the lower end of the first ear plate is welded to the upper part of the front cover plate; the second ear plate is in the shape of a spoon hook, and the lower end of the second ear plate is welded to the upper part of the cross tube.

[0035] By designing the first ear plate in the shape of a slide and welding its lower end to the upper part of the front cover plate, this design not only increases the welding area but also makes the distribution of welding points more uniform; a larger welding area means stronger connection strength, which can effectively resist forces and torques from all directions, thereby enhancing the overall structural stability of the front frame.

[0036] The slide-shaped and spoon-hook-shaped ear plate designs enable the first ear plate and the second ear plate to more effectively disperse stress to the entire welding area when bearing loads, rather than concentrating on a certain point or line; this optimization of stress distribution helps to reduce the phenomenon of local stress concentration and improve the fatigue life and load-bearing capacity of the structure.

[0037] As Figure 5 shown, a front frame of a loader provided by the utility model further includes a pair of symmetrically distributed bridge supports; the front parts above the two bridge supports are respectively welded to the lower parts in front of the two inner side plates.

[0038] Furthermore, the bridge support includes a fixing plate, a bottom plate, and a tail plate; the lower end of the fixing plate is connected to the side of the bottom plate.

[0039] Furthermore, the fixing plate is approximately triangular and the outward side is welded to the outward side of the inner side plate.

[0040] The tail plate is in the shape of a fish tail with both sides rolled up and the lower end folded outward. The front end of the tail plate is connected to the rear ends of the fixing plate and the bottom plate, and one end of the tail plate on the same side as the fixing plate is welded to the inner side plate. Two rows of mounting holes, a first reinforcing rib plate, and a second reinforcing rib plate are provided on the bottom plate.

[0041] Specifically, the two rows of mounting holes are symmetrically distributed on both sides of the first reinforcing rib plate.

[0042] Both the first reinforcing rib plate and the second reinforcing rib plate are in the shape of an arc-edge triangular box; the convex surface of the first reinforcing rib plate is connected to the middle position of the concave surfaces of the fixed plate and the bottom plate, and the convex surface of the second reinforcing rib plate is connected to the position near the right edge of the concave surfaces of the fixed plate and the bottom plate. The arc dimensions of the first reinforcing rib plate and the second reinforcing rib plate are consistent with the arc dimensions at the connected positions.

[0043] Compared with the flat fixing brackets and tail plates commonly used in the prior art, this structural design can, while enhancing its own structural strength, transfer the stress received by the bridge bearing from the welds where structural damage is most likely to occur to the arc edges and the ends of the fish tails, greatly enhancing the supporting capacity of the bridge bearing, and further enhancing the structural strength of the entire front frame of the loader.

[0044] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not a limitation on the protection scope of the present invention. Those skilled in the art should understand that, based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A front frame of a loader, characterized in that: include: A left wing box and a right wing box are symmetrically arranged, each of the left wing box and the right wing box comprises an outer side plate and an inner side plate arranged in parallel, a middle beam frame is connected between the upper parts of the two inner side plates, a front end of the middle beam frame is connected to a front cover plate located between the two inner side plates, and a rear end of the middle beam frame is provided with an upper and lower hinged welding assembly connected between the two inner side plates; The upper and lower hinged welding components include an upper hinged plate, a lower hinged plate and a welding plate.

2. A loader front frame according to claim 1, characterized in that: The center beam frame includes a cross tube, a front cover plate, and two front cross beams; The rear end of the front cover plate is welded to the front end of the cross tube, and the front end of the front cover plate is welded to the rear end of the front cover plate; the two front cross beams are spaced apart along the length direction of the cross tube.

3. A loader front frame according to claim 2, characterized in that: The upper and lower ends of the front cross beam are respectively provided with a first opening and a second opening; The first opening is used to connect the bucket cylinder; The interior of the second opening is an approximately triangular cavity, and the cavity contains three reinforcing ribs; the reinforcing ribs are spaced and vertically arranged along the length direction of the bottom edge of the cavity.

4. A loader front frame according to claim 3, characterized in that: The front cross beam further includes a first ear plate and a second ear plate; The first ear plate is in a slide shape, and the lower end of the first ear plate is welded to the upper part of the front cover plate; the second ear plate is in a spoon hook shape, and the lower end of the second ear plate is welded to the upper part of the cross tube.

5. The front frame of a loader according to claim 1, characterized in that: It also includes a pair of symmetrically distributed bridge supports; the front upper parts of the two bridge supports are respectively welded to the front lower parts of the two inner side plates.

6. A loader front frame according to claim 5, characterized in that: The bridge support comprises a fixing plate, a bottom plate and a tail plate; the lower end of the fixing plate is connected to the side edge of the bottom plate.

7. A loader front frame according to claim 6, characterized in that: The fixing plate is approximately triangular in shape, and one side facing outward is welded to one side facing outward of the inner plate.

8. The front frame of a loader according to claim 6, characterized in that: The tail plate is a fishtail-shaped structure with rolled-up sides and folded outward at the lower end; The front end of the tail plate is connected to the rear ends of the fixing plate and the bottom plate, and one end of the tail plate on the same side as the fixing plate is welded to the inner plate.

9. A loader front frame according to claim 6 or 7, characterized in that: The bottom plate is provided with two rows of mounting holes, a first reinforcing rib plate and a second reinforcing rib plate; The two rows of mounting holes are symmetrically distributed on both sides of the first reinforcing rib plate; The first reinforcing rib plate and the second reinforcing rib plate are both arc-edged triangular box-shaped; the outer convex surface of the first reinforcing rib plate is connected to the middle position of the inner concave surface of the fixed plate and the bottom plate, and the outer convex surface of the second reinforcing rib plate is connected to the right edge position near the inner concave surface of the fixed plate and the bottom plate.

10. A loader front frame according to claim 9, characterized in that: The arc dimensions of the first reinforcing rib plate and the second reinforcing rib plate are consistent with the arc dimensions at the connecting positions.

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