Main frame of engineering machinery

Abstract

The utility model relates to the technical field of engineering machinery, in particular to an engineering machinery main rack which comprises a front support defined by an upper cover plate A, a lower cover plate A, a left side plate A and a right side plate A. The right end of the upper cover plate A protrudes out of the right ends of the left side plate A and the right side plate A, and the right end of the lower cover plate A protrudes out of the right ends of the left side plate A and the right side plate A; the shank frame is defined by an upper cover plate B, a lower cover plate B, a left side plate B and a right side plate B, the shank frame and the front support are welded and connected in a concave-convex structure mode, the left end of the left side plate B protrudes out of the left ends of the upper cover plate B and the lower cover plate B, and the left end of the right side plate B protrudes out of the left ends of the upper cover plate B and the lower cover plate B; the box body is arranged on the right side of the shank frame in a fixed structure mode, the main machine frame is of a convex-concave plug-in type structure instead of a traditional flush butt welding seam structure, stress concentration of flush butt welding seams can be avoided, weakening of base metal strength caused by intersection of welding heat affected zones can be reduced, and the impact resistance of the main machine frame is improved.

Description

Technical Field:

[0001] The present application relates to the technical field of construction machinery, and particularly to a mainframe of construction machinery. Background Art:

[0002] The mainframe of construction machinery is the backbone of the main machine, the basic carrier for the installation of the involved assembly parts and components, and also the main component bearing the overall machine quality, operating load, and various impact loads. It is one of the key core components of the main machine and belongs to a typical rigid frame structure where the front frame and the lower leg frame of the rear axle box are welded by butt welds. Therefore, strict requirements are imposed on aspects such as the alignment accuracy and welding quality during its assembly.

[0003] The Chinese utility model patent with the application number 202320448698.8 - a mainframe of a bulldozer, includes: a front bracket and a rear axle box. One end of the front bracket close to the rear axle box is provided with a connecting protrusion, and one end of the rear axle box close to the connecting frame is provided with an installation groove. A clearance fit is provided between the connecting protrusion and the connecting groove, and V - shaped welds are provided around the connecting protrusion and the installation groove. Welding is carried out in the V - shaped welds between the front bracket and the rear axle box to fill the gap between the front bracket and the rear axle box, increasing the firmness of the connection between the front bracket and the rear axle box.

[0004] The mainframe of this patent adopts the traditional welding structure of a four - sided flush butt weld structure. During the harsh pushing and transporting operations, the mainframe is often subjected to concentrated impact forces, resulting in accidents such as flush - cut fractures or significant cracking, causing the main machine to be out of operation for a long time. Utility Model Content:

[0005] To solve the above - mentioned technical problems, the present utility model provides a mainframe of construction machinery. The technical problem to be solved is that the mainframe adopts the traditional welding structure of a four - sided flush butt weld structure, which is prone to flush - cut fracture accidents or significant cracking phenomena. The technical solution adopted by the present utility model to solve the above - mentioned technical problems is as follows:

[0006] A mainframe of construction machinery, including:

[0007] A front bracket enclosed by an upper cover plate A, a lower cover plate A, a left side plate A, and a right side plate A. The right end of the upper cover plate A protrudes from the right ends of the left side plate A and the right side plate A, and the right end of the lower cover plate A protrudes from the right ends of the left side plate A and the right side plate A;

[0008] A lower leg frame enclosed by an upper cover plate B, a lower cover plate B, a left side plate B, and a right side plate B. The lower leg frame is welded and connected to the front bracket in an uneven structure manner. The left end of the left side plate B protrudes from the left ends of the upper cover plate B and the lower cover plate B, and the left end of the right side plate B protrudes from the left ends of the upper cover plate B and the lower cover plate B;

[0009] A box body, which is arranged on the right side of the lower leg frame in a fixed - structure manner.

[0010] Furthermore, a V-shaped weld is provided between the upper cover plate A and the upper cover plate B.

[0011] Furthermore, a V-shaped weld is provided between the lower cover plate A and the lower cover plate B.

[0012] Furthermore, a V-shaped weld is provided between the left side plate A and the left side plate B.

[0013] Furthermore, a V-shaped weld is provided between the right side plate A and the right side plate B.

[0014] Furthermore, the right end of the left side plate A is flush with the right end of the right side plate A; the left end of the left side plate B and the left end of the right side plate B are flush.

[0015] The upper cover plate A and the upper cover plate B both have a thickness of t, and the distance that the upper cover plate A protrudes from the right end of the left side plate A is 2t + 50 mm; the distance that the left end of the left side plate B protrudes from the left end of the upper cover plate B is 2t + 50 mm.

[0016] The beneficial effects of the present utility model are as follows: The main frame adopts a convex-concave plug-in structure to replace the traditional flush butt weld structure, which can not only avoid stress concentration at the flush butt weld, but also reduce the weakening of the strength of the base material caused by the intersection of the welding heat affected zones, and improve the impact resistance of the main frame. Description of the drawings:

[0017] Figure 1 is an exploded structure schematic diagram of the present utility model.

[0018] Figure 2 is a front view structure schematic diagram of the present utility model.

[0019] Figure 3 is a top view structure schematic diagram of the present utility model.

[0020] In the figure:

[0021] 1. Upper cover plate A, 2. Lower cover plate A, 3. Left side plate A, 4. Upper cover plate B, 5. Lower cover plate B, 6. Left side plate B, 7. Box body. Specific embodiments:

[0022] To make the purpose, technical solutions and advantages of the implementation of the present utility model clearer, the present utility model will now be further described in detail with reference to the drawings and the following embodiments, so that the public can better master the implementation method of the present utility model. The specific implementation scheme of the present utility model is as follows:

[0023] An engineering machinery mainframe includes a front bracket enclosed by an upper cover plate A1, a lower cover plate A2, a left side plate A3, and a right side plate A. The right end of the upper cover plate A1 protrudes beyond the left side plate A3 and the right side plate A. The right end of the lower cover plate A2 protrudes beyond the left side plate A3 and the right side plate A. There is a calf bracket enclosed by an upper cover plate B4, a lower cover plate B5, a left side plate B6, and a right side plate B. The calf bracket is welded to the front bracket in a concave-convex structure manner. The left end of the left side plate B6 protrudes beyond the left end of the upper cover plate B4 and the lower cover plate B5. The left end of the right side plate B protrudes beyond the left end of the upper cover plate B4 and the lower cover plate B5. A box body 7 is arranged on the right side of the calf bracket in a fixed structure manner. The mainframe adopts a concave-convex plug-in structure to replace the traditional flush butt weld structure, which can not only avoid stress concentration in the flush butt weld, but also reduce the weakening of the base material strength caused by the intersection of the welding heat affected zones, and improve the impact resistance of the mainframe.

[0024] It should be noted that there is a V-shaped weld between the upper cover plate A1 and the upper cover plate B4; there is a V-shaped weld between the lower cover plate A2 and the lower cover plate B5; there is a V-shaped weld between the left side plate A3 and the left side plate B6; there is a V-shaped weld between the right side plate A and the right side plate B, which makes the connection more compact and improves the strength and reliability of the mainframe.

[0025] It should be noted that the right ends of the left side plate A3 and the right side plate A are flush; the left ends of the left side plate B6 and the right side plate B are flush; the thicknesses of the upper cover plate A1 and the upper cover plate B4 are both t. The distance that the upper cover plate A1 protrudes beyond the right end of the left side plate A3 is 2t + 50 mm; the distance that the left end of the left side plate B6 protrudes beyond the left end of the upper cover plate B4 is 2t + 50 mm, which reduces stress concentration in the welds.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "front", "rear", "lower left", "upper right", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 therefore cannot be understood as a limitation on the protection scope of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Although the present invention is described according to a limited number of embodiments, those skilled in the art in this technical field should understand that within the scope of the present invention described hereby, other embodiments can be envisioned.

Claims

1. An engineering machinery mainframe, characterized in that, include: A front bracket formed by an upper cover plate A (1), a lower cover plate A (2), a left side plate A (3) and a right side plate A, wherein the right end of the upper cover plate A (1) protrudes from the right ends of the left side plate A (3) and the right side plate A, and the right end of the lower cover plate A (2) protrudes from the right ends of the left side plate A (3) and the right side plate A; A calf frame formed by an upper cover plate B (4), a lower cover plate B (5), a left side plate B (6) and a right side plate B, wherein the calf frame is welded to the front frame in a concave-convex structure, wherein the left end of the left side plate B (6) protrudes from the left ends of the upper cover plate B (4) and the lower cover plate B (5), and the left end of the right side plate B protrudes from the left ends of the upper cover plate B (4) and the lower cover plate B (5); The box body (7) is arranged on the right side of the calf frame in a fixed structure manner.

2. The main frame of a construction machinery according to claim 1, characterized in that: A V-shaped weld is provided between the upper cover plate A (1) and the upper cover plate B (4).

3. The main frame of a construction machinery according to claim 1, characterized in that: A V-shaped weld is provided between the lower cover plate A (2) and the lower cover plate B (5).

4. The main frame of a construction machinery according to claim 1, characterized in that: A V-shaped weld is provided between the left side plate A (3) and the left side plate B (6).

5. The main frame of a construction machinery according to claim 1, wherein: A V-shaped weld is provided between the right side plate A and the right side plate B.

6. The main frame of a construction machinery according to claim 1, wherein: The right end of the left side plate A (3) is flush with the right end of the right side plate A; the left end of the left side plate B (6) is flush with the left end of the right side plate B; The thickness of the upper cover plate A (1) and the upper cover plate B (4) are both t. The distance that the upper cover plate A (1) protrudes from the right end of the left side plate A (3) is 2t + 50 mm; the distance that the left end of the left side plate B (6) protrudes from the left end of the upper cover plate B (4) is 2t + 50 mm.

Images