Excavator boom tail seat reinforcing structure and excavator

Abstract

The utility model provides a kind of excavator movable arm tail seat reinforcing structure and excavator, belong to excavator technical field, including shaft cylinder and forge piece, the forge piece is equipped with two, symmetrically set in shaft cylinder outer surface both ends, the side of forge piece away from shaft cylinder is welded with side plate fixed, the outer surface of side plate close to forge piece one end is fixed with reinforcing plate;The thickness of the forge piece is greater than the thickness of side plate, the thickness of reinforcing plate is equal to the difference between forge piece thickness and side plate thickness.The utility model improves the joint rigidity and strength between tail seat and side plate while not increasing excavator movable arm weight.

Description

Technical Field

[0001] This utility model belongs to the field of excavator technology, and in particular relates to an excavator boom tailstock reinforcement structure and an excavator. Background Technology

[0002] The integral curved boom is the main type of boom used in backhoe excavators. Structurally, it is a symmetrical, closed, hollow, box-shaped welded structure. The front and rear ends are forged or cast steel parts, while the middle part is welded from low-alloy high-strength plates. The rear tailstock is the hinge point between the boom and the machine body. This part is the root of the entire working device. During operation, the bucket or breaker, stick, and boom itself are loaded under the drive of the hydraulic cylinders, bearing significant bending moments and torques. Its crack resistance plays a crucial role in the reliability of the boom.

[0003] Currently, the rear seat of medium and large excavators is usually formed by forgings at both ends and a cylinder to form a relatively wide forged and welded structure. The top and bottom are connected to the cover plate, and the left and right sides are connected to the side plates to form a closed box-shaped structure. The tailstock forging and the side plates form a butt joint with a pad and full penetration.

[0004] However, due to the strong vibrations generated during crushing operations, the impact of digging forces and rotational acceleration and deceleration during excavation, and the complex loads generated by eccentric digging, high requirements are placed on the welding quality and fatigue details of the joint, making it prone to fatigue cracking.

[0005] To reduce market failures such as early cracking in this area, the usual design strategy is to increase the rigidity and strength of the joint by thickening both the forging and the side plate. However, due to the large profile of the side plate, the weight of the boom inevitably increases significantly. Utility Model Content

[0006] In view of the defects or deficiencies in the existing technology, this utility model provides a reinforcement structure for the tailstock of an excavator boom and an excavator, which improves the rigidity and strength of the joint between the tailstock and the side plate without increasing the weight of the excavator boom.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: In the first aspect, an embodiment of the present invention provides a reinforcement structure for the tailstock of an excavator boom, including a shaft cylinder and forgings. Two forgings are provided and symmetrically arranged at both ends of the outer surface of the shaft cylinder. The side of the forging away from the shaft cylinder is welded and fixed to a side plate. A reinforcing plate is fixed on the outer surface of the side plate near the end of the forging. The thickness of the forging is greater than the thickness of the side plate, and the thickness of the reinforcing plate is equal to the difference between the thickness of the forging and the thickness of the side plate.

[0008] Furthermore, the upper part of the shaft cylinder is welded and fixed to the upper cover plate of the boom, and the bottom of the shaft cylinder is welded and fixed to the lower cover plate of the boom.

[0009] Furthermore, there are two side plates, which are symmetrically arranged between the upper cover plate and the lower cover plate of the boom.

[0010] Furthermore, the distance between the two forgings is equal to the distance between the two side plates.

[0011] Furthermore, the inner side surface of the forging is flush with the inner side surface of the side plate.

[0012] Furthermore, the side of the reinforcing plate closest to the forging is a straight edge, and the straight edge is welded and fixed to the side of the forging away from the shaft cylinder.

[0013] Furthermore, the middle part of the end of the reinforcing plate away from the forging is a concave arc-shaped edge, and the top and bottom ends of the arc-shaped edge are spaced at a predetermined distance from the side of the reinforcing plate.

[0014] Furthermore, the arc-shaped edge of the reinforcing plate is welded and fixed to the side plate.

[0015] Furthermore, an exhaust hole is provided in the middle of the outer surface of the reinforcing plate.

[0016] In a second aspect, an excavator includes an excavator boom reinforcement structure as described above, the excavator boom reinforcement structure being located at the rear end of the excavator boom.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: By thickening the tailstock forging and fixing a reinforcing plate to the outer surface of the side plate, the rigidity and strength of the joint between the tailstock and the side plate are increased. Simultaneously, by designing the side of the reinforcing plate furthest from the forging as an arc edge, stress on the reinforcing plate can be smoothly transferred to the side plate without increasing the overall thickness of the side plate, thus reducing the increase in boom weight. Furthermore, since the thickness of the forging is greater than the thickness of the side plate, and the thickness of the reinforcing plate is equal to the difference between the forging thickness and the side plate thickness, the outer surface of the forging is flush with the surface of the reinforcing plate, thereby avoiding stress concentration at the connection point. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the boom in an embodiment of this utility model; Figure 2 This is a schematic diagram of the tailstock structure in an embodiment of the present utility model; Figure 3 This is a schematic diagram of the reinforcing plate structure in an embodiment of this utility model; Among them, 1. shaft cylinder; 2. forging; 3. upper cover plate of boom; 4. lower cover plate of boom; 5. side plate; 6. reinforcing plate; 61. straight edge; 62. arc edge; 63. vent hole. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Example 1 A typical embodiment of this utility model is as follows: Figure 1 and Figure 2 As shown, a reinforcement structure for the tailstock of an excavator boom includes a shaft cylinder 1 and forgings 2. Two forgings 2 are provided and symmetrically arranged at both ends of the outer surface of the shaft cylinder 1. The shaft cylinder 1 is used to pass through a shaft pin, thereby hinged to the excavator body. The upper part of the shaft cylinder 1 is welded and fixed to the upper cover plate 3 of the boom, and the bottom of the shaft cylinder 1 is welded and fixed to the lower cover plate 4 of the boom. A side plate 5 is provided between the upper cover plate 3 of the boom and the lower cover plate 4 of the boom. Two side plates 5 are provided and symmetrically arranged on both sides. The distance between the two forgings 2 is equal to the distance between the two side plates 5. The end of the forging 2 away from the shaft cylinder 1 is welded and fixed to the side plate 5, so that the upper cover plate 3 of the boom, the lower cover plate 4 of the boom, the two side plates 5 and the shaft cylinder 1 enclose a box structure.

[0021] Furthermore, the forging 2 has a fan-shaped plate structure to adapt to the shape of the boom end, so that one end can be welded and fixed to the shaft cylinder 1 and the other end can be welded and fixed to the side plate 5.

[0022] The thickness of forging 2 is greater than that of side plate 5. The inner surface of forging 2 is flush with the inner surface of side plate 5. A reinforcing plate 6 is welded and fixed to the outer surface of side plate 5 near the end of forging 2. The reinforcing plate 6 is trapezoidal and fits the outer surface of the end of side plate 5, covering the outer surface of side plate 5. The two sides of reinforcing plate 6 are evenly spaced from the upper cover plate 3 and the lower cover plate 4 of boom, respectively. The thickness of reinforcing plate 6 is equal to the difference between the thickness of forging 2 and the thickness of side plate 5, so that the outer surface of forging 2 is flush with the surface of reinforcing plate 6, thereby avoiding stress concentration at the connection.

[0023] like Figure 3 As shown, the side of the reinforcing plate 6 closest to the forging 2 is a straight edge 61, which facilitates welding and fixing to the side of the forging 2. The weld excess height between the forging 2 and the reinforcing plate 6 needs to be finely ground to be flat after welding, and then filled and welded with the weld seam of the upper and lower cover plates.

[0024] The middle part of the end of the reinforcing plate 6 away from the forging 2 is a concave arc-shaped edge 62, and the top and bottom ends of the arc-shaped edge 62 are spaced apart from the side of the reinforcing plate 6 by a set distance. In this embodiment, the top and bottom ends of the arc-shaped edge 62 are spaced apart from the side of the reinforcing plate 6 by 20mm. The arc-shaped edge 62 of the reinforcing plate 6 is welded and fixed to the side plate 5. The upper and lower ends of the arc-shaped edge 62 are finely ground to a smooth transition after welding.

[0025] By setting the end of the reinforcing plate 6 away from the forging 2 into a C-shape, the stress on the reinforcing plate 6 can be smoothly transferred to the side plate 5, which improves the rigidity of the tailstock docking structure.

[0026] Furthermore, an exhaust hole 63 is provided in the middle of the outer surface of the reinforcing plate 6. In this embodiment, the exhaust hole 63 is circular with a diameter of 10mm, so as to remove gas during the heat treatment of the boom after welding and prevent deformation. The exhaust hole 63 is welded, repaired and ground smooth after heat treatment.

[0027] By thickening the tailstock forging and fixing a reinforcing plate to the outer surface of the side plate, the rigidity and strength of the joint between the tailstock and the side plate are increased. Simultaneously, by designing the side of the reinforcing plate furthest from the forging as an arc edge, stress on the reinforcing plate can be smoothly transferred to the side plate without increasing the overall thickness of the side plate, thus reducing the increase in boom weight. Furthermore, since the thickness of the forging is greater than the thickness of the side plate, and the thickness of the reinforcing plate equals the difference between the forging and side plate thicknesses, the outer surface of the forging is flush with the surface of the reinforcing plate, thereby avoiding stress concentration at the connection.

[0028] Example 2 This embodiment provides an excavator, including an excavator boom reinforcement structure as described in Embodiment 1, wherein the excavator boom reinforcement structure is located at the rear end of the excavator boom.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A reinforcement structure for the tailstock of an excavator boom, characterized in that, It includes a shaft sleeve and forgings. Two forgings are provided and are symmetrically arranged at both ends of the outer surface of the shaft sleeve. The side of the forging away from the shaft sleeve is welded and fixed to a side plate. A reinforcing plate is fixed on the outer surface of the side plate near the end of the forging. The thickness of the forging is greater than the thickness of the side plate, and the thickness of the reinforcing plate is equal to the difference between the thickness of the forging and the thickness of the side plate.

2. The excavator boom tail support reinforcement structure as described in claim 1, characterized in that, The upper part of the shaft cylinder is welded and fixed to the upper cover plate of the boom, and the bottom of the shaft cylinder is welded and fixed to the lower cover plate of the boom.

3. The excavator boom tail support reinforcement structure as described in claim 2, characterized in that, The side plates are provided in two symmetrically arranged between the upper cover plate and the lower cover plate of the boom.

4. The excavator boom tail support reinforcement structure as described in claim 3, characterized in that, The distance between the two forgings is equal to the distance between the two side plates.

5. The excavator boom tail support reinforcement structure as described in claim 3, characterized in that, The inner side of the forging is flush with the inner side of the side plate.

6. The excavator boom tail support reinforcement structure as described in claim 1, characterized in that, The side of the reinforcing plate closest to the forging is a straight edge, and the straight edge is welded and fixed to the side of the forging away from the shaft cylinder.

7. The excavator boom tail support reinforcement structure as described in claim 3, characterized in that, The middle part of the end of the reinforcing plate away from the forging is a concave arc-shaped edge, and the top and bottom ends of the arc-shaped edge are spaced at a set distance from the side of the reinforcing plate.

8. The excavator boom tail support reinforcement structure as described in claim 7, characterized in that, The curved edge of the reinforcing plate is welded and fixed to the side plate.

9. The excavator boom tail support reinforcement structure as described in claim 1, characterized in that, An exhaust hole is provided in the middle of the outer surface of the reinforcing plate.

10. An excavator, comprising a boom tailstock reinforcement structure as described in any one of claims 1-9, characterized in that, The excavator boom reinforcement structure is located at the rear end of the excavator boom.

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