A bulldozing blade structure for a small excavator and a small excavator

Abstract

The utility model discloses a kind of bulldozing shovel structure and small excavator for small excavator, bulldozing shovel includes left bulldozing arm, right bulldozing arm, crossbeam, shovel body, the crossbeam is connected between left bulldozing arm, right bulldozing arm, left bulldozing arm, right bulldozing arm tip connects shovel body, left hinge point seat is welded and connected to the end of left bulldozing arm away from shovel body;Right hinge point seat is welded and connected to the end of right bulldozing arm away from shovel body, the crossbeam is provided with hinge lug plate;Left bulldozing arm, right bulldozing arm are rectangular steel tube structure.The utility model is to the present situation that small hydraulic excavator bulldozing shovel structure is not good, optimization innovation design is carried out, manufacturing cost is reduced, structural strength is optimized, structural deformation is reduced, the purpose of reducing cost and increasing efficiency is achieved, improve bulldozing shovel performance, improve bulldozing shovel quality, extend its service life cycle.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, specifically to a bulldozer blade structure for a small excavator and a small excavator. Background Technology

[0002] It has become standard practice to equip mini hydraulic excavators with bulldozer blades. The bulldozer blade is primarily used to remove obstacles, clear road surfaces, and stabilize the machine. When moving, the bulldozer blade is positioned in the direction of travel, with its bottom edge flush with the bottom edge of the tracks, enhancing its trenching, backfilling, and leveling capabilities. When working on slopes, the bulldozer blade helps prevent landslides, stabilizes the machine, and levels the work surface for backfilling.

[0003] The bulldozer blade, a component of a small hydraulic excavator, plays a crucial role in the manufacturing, assembly, performance, and lifespan of the machine. Currently, the materials used in bulldozer blades are expensive; significant deformation occurs during welding, making assembly difficult and requiring reshaping; and after reshaping, the dimensional tolerances of the pin holes and pin shafts often fail to meet design requirements, leading to accelerated wear and severely impacting their lifespan. Optimizing and improving the bulldozer blade structure is a pressing issue that needs to be addressed. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides a bulldozer blade structure for a small excavator and a small excavator.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] On one hand, this utility model provides a bulldozer blade structure for a small excavator, including a left bulldozer arm, a right bulldozer arm, a crossbeam, and a blade body. The crossbeam is connected between the left and right bulldozer arms, and the ends of the left and right bulldozer arms are connected to the blade body. The end of the left bulldozer arm away from the blade body is welded to a left hinge point seat; the end of the right bulldozer arm away from the blade body is welded to a right hinge point seat; the crossbeam is provided with a hinge lug plate; the left and right bulldozer arms are steel pipe structures.

[0007] Furthermore, the left and right bulldozer arms are rectangular steel pipe structures, and the material of the left and right bulldozer arms is QB355B.

[0008] Furthermore, the left hinge point seat and the right hinge point seat have symmetrical structures;

[0009] Specifically, the left hinge point seat or the right hinge point seat includes a base plate, a hinge plate, a mounting plate, and a protective ring;

[0010] Specifically, the hinge plate is perpendicularly connected to the base plate, and the end face of the base plate away from the hinge plate is connected to the left bulldozer arm or the right bulldozer arm.

[0011] Specifically, the hinge plate has a through hinge hole on its side end face, and the hinge plate has annular plates at both ends of the hinge hole.

[0012] Specifically, the upper surface of the hinge plate is provided with a lubricating oil nozzle communicating with the hinge hole, and the protective ring is provided at the port of the lubricating oil nozzle to protect the lubricating oil nozzle.

[0013] Furthermore, the outer periphery of the base plate is larger than the cross-section of the left or right bulldozer arm, which facilitates welding, improves welding strength and structural strength, and protects the hinge points.

[0014] Furthermore, the retaining ring is a side-opening retaining ring, and the retaining rings of the left hinge point seat and the retaining rings of the right hinge point seat are arranged face to face.

[0015] Secondly, this utility model provides a small excavator, including a track frame, a bulldozer blade cylinder, and a bulldozer blade structure for a small excavator as described in one aspect; the left hinge point seat of the bulldozer blade is rotatably connected to the track frame, and the right hinge point seat of the bulldozer blade is rotatably connected to the track frame; the bulldozer blade cylinder is rotatably connected to the hinge plate and the track frame drive hinge point of the track frame respectively.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] This utility model addresses the shortcomings of the bulldozer blade structure in small hydraulic excavators by optimizing and innovating its design. This reduces manufacturing costs, improves structural strength, and minimizes structural deformation, thereby achieving cost reduction and efficiency improvement, enhancing the performance and quality of the bulldozer blade, and extending its service life. Attached Figure Description

[0018] Figure 1 This is a layout diagram for the installation of a bulldozer blade.

[0019] Figure 2 This is a schematic diagram of the bulldozer blade installation layout, shown in direction A.

[0020] Figure 3 This is a schematic diagram of a conventional bulldozer blade.

[0021] Figure 4 This is a schematic diagram of a conventional bulldozer arm structure.

[0022] Figure 5 This is an enlarged view of the hinge point of a standard bulldozer blade.

[0023] Figure 6 It is a standard process support rod used for welding bulldozer blades.

[0024] Figure 7 This is a schematic diagram of the structure of a bulldozer blade for a small excavator according to this utility model.

[0025] Figure 8This is a schematic diagram of the bulldozer arm in this utility model.

[0026] Figure 9 This is a structural schematic diagram of the left bulldozer arm assembly in this utility model.

[0027] Figure 10 This is a schematic diagram of the structure of the left hinge point seat in this utility model.

[0028] Figure 11 This is a structural schematic diagram of the right bulldozer arm assembly in this utility model.

[0029] Figure 12 This is a schematic diagram of the right hinge point seat in this utility model.

[0030] In the diagram: 1. Bulldozer blade, 2. Bulldozer blade cylinder, 3. Track frame, 4. Bulldozer blade drive hinge point, 5. Track frame drive hinge point, 6. First rotation hinge point, 7. Second rotation hinge point, 81. Left conventional bulldozer arm, 82. Right conventional bulldozer arm, 9. Conventional crossbeam, 10. Support rod, 11. Crossbeam, 12. Bulldozer arm, 121. Left bulldozer arm, 122. Right bulldozer arm, 13. Left hinge point seat, 14. Right hinge point seat, 13.1. Base plate, 13.2. Hinge plate, 13.3. Protective ring, 13.4. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] A small hydraulic excavator equipped with a bulldozer blade has the following structural layout: Figure 1 , Figure 2 As shown, the first rotation hinge point 6 and the second rotation hinge point 7 of the bulldozer blade 1 are respectively connected to the track frame 3; the bulldozer blade cylinder 2 is rotatably connected to the bulldozer blade drive hinge point 4 of the bulldozer blade 1 and the track frame drive hinge point 5 of the track frame 3, and is used to raise the bulldozer blade 1 and dig deeper.

[0033] The main connecting parts of the bulldozer blade before optimization, such as Figure 3As shown, the bulldozer blade drive hinge point 4 is used to connect to the bulldozer blade cylinder 2. The first rotation hinge point 6 and the second rotation hinge point 7 are used to connect to the track frame 3. The left conventional bulldozer arm 81 and the right conventional bulldozer arm 82 are used to support the bulldozer blade to complete the corresponding lifting and digging actions. The conventional crossbeam 9 is used to connect to the hinge plate. The hinge plate is equipped with the bulldozer blade drive hinge point 4 that connects to the bulldozer blade cylinder 2, and also to reinforce the left conventional bulldozer arm 81 and the right conventional bulldozer arm 82. The left conventional bulldozer arm 81 is composed of an independent steel plate and the first rotation hinge point 6, and the right conventional bulldozer arm 82 is composed of an independent steel plate and the second rotation hinge point 7. The corresponding structures are as follows. Figure 4 As shown.

[0034] Figure 5 This is a detailed enlarged view of the first rotating hinge point 6 before optimization. When the left conventional bulldozer arm 81 and right conventional bulldozer arm 82 are welded to the conventional crossbeam 9, thermal stress can easily cause severe deformation at the first rotating hinge point 6 and the second rotating hinge point 7, making it impossible to machine the pin holes at these points. To prevent deformation at these points, process struts 10 are added at them. Figure 6 As shown, to enhance rigidity and reduce welding deformation, the pin holes at the first rotating hinge point 6 and the second rotating hinge point 7 are boring after welding. However, during the overall assembly of the bulldozer blade, after removing the process strut 10, due to residual internal stress, the first rotating hinge point 6 at the end of the left conventional bulldozer arm 81 and the second rotating hinge point 77 at the end of the right conventional bulldozer arm 82 deformed significantly and rebounded. This caused the pin holes at the first rotating hinge point 6 and the second rotating hinge point 7 to be unable to be assembled and connected with the track frame. It is necessary to heat-correct points A and B of the left conventional bulldozer arm 81 and the right conventional bulldozer arm 82. Because the heat correction was not very accurate, the pin holes at the first rotating hinge point 6 and the second rotating hinge point 7 could not be accurately assembled and connected with the track frame. It is necessary to grind the inner holes of the pin holes at the first rotating hinge point 6 and the second rotating hinge point 7 of the bulldozer blade before the pin shaft connecting the bulldozer blade and the track frame can be barely assembled. This will inevitably accelerate the grinding of the inner holes of the pin holes at the first rotating hinge point 6 and the second rotating hinge point 7 and the outer circle of the pin shaft, greatly shortening their service life.

[0035] Example 1:

[0036] Please see Figures 7 to 12This utility model provides a bulldozer blade structure for a small excavator, including a left bulldozer arm 121, a right bulldozer arm 122, a crossbeam 11, and a blade body. The crossbeam 11 is welded between the left bulldozer arm 121 and the right bulldozer arm 122. The blade body is welded to the ends of the left bulldozer arm 121 and the right bulldozer arm 122. A left hinge point seat 13 is welded to the end of the left bulldozer arm 121 away from the blade body, and a right hinge point seat 14 is welded to the end of the right bulldozer arm 122 away from the blade body. The left hinge point seat 13 is a first rotation hinge point 6, and the right hinge point seat 14 is a second rotation hinge point 7.

[0037] The left bulldozer arm 121 and the right bulldozer arm 122, as Figure 8 As shown, a rectangular steel tube structure (box-type structure) is adopted, made of Q355B steel. This significantly enhances the overall strength and rigidity of the mechanical properties, as well as its resistance to deformation, torsion, and bending. The left bulldozer arm 121 and right bulldozer arm 122 of the rectangular steel tube structure (box-type structure) are significantly lighter than those of conventional bulldozer arms before optimization. This achieves structural lightweighting, reduces material costs, and simultaneously enhances the overall structural strength, rigidity, and other mechanical properties.

[0038] The crossbeam 11 is used to connect the hinge plate, and the hinge plate is provided with the drive hinge point 4 of the bulldozer blade cylinder 2, which is connected to the bulldozer blade cylinder 2. It is also used to reinforce the left bulldozer arm 121 and the right bulldozer arm 122. The conventional bulldozer arm of the optimized bulldozer blade is an independent steel plate, while the optimized bulldozer arm is a rectangular steel pipe. The thickness of the independent steel plate is much smaller than the width of the rectangular steel pipe. The length of the inner crossbeam 11 of the two optimized bulldozer arms is shorter than that of the conventional crossbeam 9 of the optimized bulldozer blade. Compared with the optimized bulldozer blade, the crossbeam 11 has better stability and strength.

[0039] The left bulldozer arm 121 is equipped with a left hinge point seat 13 at its end, such as Figure 9 As shown, the left hinge point seat 13 adopts a steel plate lap welding structure, and the overall structural performance and strength are further improved after the left bulldozer arm 121 and the left hinge point seat 13 are combined.

[0040] The right bulldozer arm 122 is equipped with a right hinge point seat 14 at its end, such as Figure 11 As shown, the right hinge point seat 14 adopts a steel plate lap welding structure, and the overall structural strength is further improved and enhanced after the right bulldozer arm 122 and the right hinge point seat 14 are combined.

[0041] The left hinge point seat 13 is as follows Figure 10 As shown, the right hinge point seat 14 is as follows Figure 12 As shown, the left hinge point seat 13 and the right hinge point seat 14 have symmetrical structures.

[0042] The left hinge point seat 13 or the right hinge point seat 14 includes a base plate 13.1, a hinge plate 13.2, a mounting plate 13.3, and a protective ring 13.4. The hinge plate 13.2 is perpendicularly welded to the base plate 13.1 to improve structural strength and enhance torsional and bending resistance. The end face of the base plate 13.1 away from the hinge plate 13.2 is welded to the left bulldozer arm 121 or the right bulldozer arm 122. A through hinge hole is provided on the side end face of the hinge plate 13.2. Annular plates 13.3 are provided at both ends of the hinge hole. The plates 13.3 help to reduce the weight of the hinge plate 13.2, facilitate machining of the countersunk surface, and facilitate connection and assembly with the track frame. This achieves both structural lightweighting and ease of machining and assembly. A lubricating oil nozzle communicating with the hinge hole is provided on the upper end face of the hinge plate 13.2 for adding lubricating oil. A protective ring 13.4 is provided at the port of the lubricating oil nozzle to protect the lubricating oil nozzle from being damaged by impact.

[0043] Specifically, the outer periphery of the base plate 13.1 is larger than the cross section of the left bulldozer arm 121 or the right bulldozer arm 122 to facilitate welding, thereby improving the welding strength and greatly enhancing the structural strength. On the other hand, the base plate 13.1 can also protect the hinge point.

[0044] Specifically, the protective ring 13.4 is a side-opening protective ring, and the protective ring 13.4 of the left hinge point seat 13 and the protective ring 13.4 of the right hinge point seat 14 are arranged face to face.

[0045] The optimized bulldozer blade structure boasts enhanced overall structural strength and rigidity, along with improved resistance to torsion, bending, and compression. The bulldozer blade exhibits minimal welding deformation, eliminating the need for reshaping. The hinge points of the bulldozer blade fully meet the assembly dimensions and geometric tolerances required for the track frame hinge points. Compared to the unoptimized bulldozer blade, the optimized blade, constructed with rectangular steel tubing, not only exhibits increased strength, rigidity, and resistance to torsion, bending, and compression, but also boasts a weight reduction of tens of kilograms, achieving cost reduction and efficiency improvement. The left and right hinge point seats are equipped with mounting plates 13.3, facilitating weight reduction of the hinge plate 13.2, simplifying machining countersinking, and enhancing connection and assembly with the track frame. This achieves both structural lightweighting and ease of machining and assembly. Furthermore, the overall weight reduction of tens of kilograms compared to the unoptimized bulldozer blade significantly reduces overall machine energy consumption. The optimized bulldozer blade structure has immense potential for widespread adoption.

[0046] Example 2:

[0047] The bulldozer blade structure for a small excavator described in Example 1 is connected to a small hydraulic excavator.

[0048] The small hydraulic excavator is equipped with a bulldozer blade. The left hinge point seat 13 of the bulldozer blade 1, i.e. the first rotation hinge point 6, is rotatably connected to the track frame 3. The right hinge point seat 14 of the bulldozer blade 1, i.e. the second rotation hinge point 7, is rotatably connected to the track frame 3. The bulldozer blade cylinder 2 is rotatably connected to the bulldozer blade drive hinge point 4 of the bulldozer blade 1 and the track frame drive hinge point 5 of the track frame 3.

[0049] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0050] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0052] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. 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.

[0053] 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 structure of a bulldozing blade for a small excavator, comprising a left bulldozing arm, a right bulldozing arm, a cross beam, and a blade body, the cross beam being connected between the left bulldozing arm and the right bulldozing arm, and the left bulldozing arm and the right bulldozing arm being connected at their end portions to the blade body, characterized in that, The left bulldozer arm is welded to a left hinge point at the end furthest from the shovel body; the right bulldozer arm is welded to a right hinge point at the end furthest from the shovel body; the crossbeam is provided with hinge lugs; the left and right bulldozer arms are steel pipe structures.

2. The dozer blade structure for a small excavator according to claim 1, characterized by The left and right bulldozer arms are rectangular steel pipe structures, and the material of the left and right bulldozer arms is QB355B.

3. The dozer blade structure for a compact excavator of claim 1, wherein The left hinge point seat and the right hinge point seat have symmetrical structures; The left or right hinge point seat includes a base plate, a hinge plate, a mounting plate, and a protective ring; The hinge plate is perpendicularly connected to the base plate, and the end face of the base plate away from the hinge plate is connected to the left bulldozer arm or the right bulldozer arm. The hinge plate has a through hinge hole on its side end face, and the hinge plate has annular plates at both ends of the hinge hole. The upper surface of the hinge plate is provided with a lubricating oil nozzle that communicates with the hinge hole, and the protective ring is provided at the port of the lubricating oil nozzle to protect the lubricating oil nozzle.

4. The dozer blade structure for a small excavator according to claim 3, characterized by The outer periphery of the base plate is larger than the cross-section of the left or right bulldozer arm, which facilitates welding, improves welding strength and structural strength, and protects the hinge points.

5. The dozer blade structure for a small excavator according to claim 3, characterized by The protective ring is a side-opening protective ring, and the protective rings of the left hinge point seat and the right hinge point seat are arranged face to face.

6. A compact excavator comprising a crawler frame, a dozing shovel cylinder, characterized by, It also includes a bulldozer blade structure for a small excavator as described in claim 1; The left hinge point of the bulldozer blade is rotatably connected to the track frame, and the right hinge point of the bulldozer blade is rotatably connected to the track frame; the hydraulic cylinder of the bulldozer blade is rotatably connected to the hinge plate and the track frame drive hinge point of the track frame respectively.

Images