Subframe and engineering machine

Abstract

This invention belongs to the technical field of general-purpose chassis cranes, specifically relating to a subframe and engineering machinery. The subframe includes a subframe body and a subframe bottom beam; the subframe bottom beam connects to the chassis beam of the engineering machinery located below; the upper shape of the subframe bottom beam matches the lower end face shape of the subframe body, and the subframe bottom beam connects to the upper subframe body; the width of the subframe bottom beam is less than the width of the subframe body. This invention solves the problems of difficult overall space layout of the general-purpose chassis crane, limited cross-sectional width of the subframe body, and limited flatness of the subframe body's bottom plate caused by direct connection between the subframe body and the general-purpose chassis.

Description

Technical Field

[0001] This invention belongs to the field of general chassis crane technology, specifically relating to a subframe and engineering machinery. Background Technology

[0002] The general-purpose chassis crane is both a road vehicle and a lifting tool. The subframe is the main load-bearing component when the vehicle is lifting. At the same time, the subframe serves as the mounting foundation for the entire general-purpose chassis crane, supporting and connecting the general-purpose chassis and the crane upper vehicle's various assemblies and related components, and ensuring that they have sufficient space and correct relative positions.

[0003] Therefore, the subframe structure must first meet the requirements of the overall vehicle layout, especially when matched with the general chassis beam, ensuring a reasonable structural design and easy installation. Secondly, the subframe also bears various static and dynamic loads from the lifting operation on the vehicle and the ground. In particular, during lifting operations, the subframe must have sufficient strength and rigidity to avoid damage due to excessive load.

[0004] During installation, travel, and operation, the subframe has a reasonable structure. Under the premise of ensuring matching with the general chassis beam, the subframe cross-section has reasonable design dimensions, and the subframe has sufficient strength and rigidity. It is of great significance for matching with the general chassis, normal operation and safe travel of the whole machine, improving the matching and installation with the general chassis, improving the stress situation of the subframe, reducing the self-weight of the general chassis crane, improving the convenience of installation, improving the performance of the whole machine, and improving the reliability of the general chassis crane.

[0005] In the prior art, as shown in Figures 1(a) and 1(b), the base plate of the subframe 1' is directly connected to the general chassis beam 2' and is connected to the chassis beam 2' via a connector 3'. With this connection method, the subframe base plate needs to be kept on the same horizontal plane, which means the subframe base plate cannot be connected using a thin-thickness plate butt joint. Furthermore, considering the spatial arrangement of the subframe and its mounting components, to ensure ease of installation and avoid interference with the general chassis tires and accessories on the general chassis beam, the maximum width of the subframe cross-section can only be the same as the width of the general chassis beam. This means that to meet high lifting performance requirements, the subframe cross-section height must be increased by rotation, which can lead to insufficient rigidity in the structural components. To meet rigidity requirements, the weight of the subframe needs to be increased, causing the overall height of the general chassis crane to exceed standard regulatory limits.

[0006] Therefore, the existing subframe design suffers from poor assembly versatility with general chassis connection methods, the inability to widen the subframe cross-section, the inability to use thin and thick plates for butt joints in the chassis floor, and limited improvement in lifting performance for the same weight. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a subframe and engineering machinery, which solves the problems of difficult overall space layout, poor assembly versatility, limited cross-sectional width of the subframe body, and limited flatness of the subframe body's base plate caused by the direct connection between the subframe body and the general chassis.

[0008] To address the shortcomings of existing technologies, the technical solution provided by this invention is as follows:

[0009] A subframe includes a subframe body and a subframe bottom beam;

[0010] The subframe bottom beam is connected to the chassis beam of the construction machinery located below; the upper shape of the subframe bottom beam matches the lower end face shape of the subframe body, the subframe bottom beam is connected to the subframe body located above, and the width of the subframe bottom beam is smaller than the width of the subframe body.

[0011] Preferably, the subframe bottom beam is welded from multiple straight plates.

[0012] Preferably, the subframe bottom beam includes two bottom beam plates, multiple transverse diaphragms, multiple longitudinal diaphragms, two bottom beam web plates, and multiple bottom beam end plates;

[0013] The web of the bottom beam is set along the length of the chassis beam of the engineering machinery. The two webs of the bottom beam are parallel to each other, and both ends are welded to the bottom beam end plate and the lower end is welded to the bottom beam bottom plate.

[0014] The transverse diaphragms are spaced apart and parallel to each other. Both ends are welded to the web plates of the two bottom beams, perpendicular to the web plates of the bottom beams, and the lower ends are welded to the bottom plates of the bottom beams.

[0015] The multiple longitudinal diaphragms are parallel to the web of the bottom beam and located between the two webs of the bottom beam. Their lower ends are welded to the bottom plate of the bottom beam. The multiple longitudinal diaphragms are spaced apart, with one side welded to the transverse diaphragm and the other side welded to the bottom beam end plate or transverse diaphragm.

[0016] The lower end of the bottom beam sealing plate is welded to the bottom plate of the bottom beam.

[0017] The two bottom beams are located on the same horizontal plane.

[0018] Preferably, the transverse diaphragm, longitudinal diaphragm, and bottom beam sealing plate are provided with weight reduction holes.

[0019] Preferably, the subframe bottom beam and the lower end face of the subframe body form a box-shaped structure.

[0020] Preferably, the subframe bottom beam is welded from one or more of the following: straight plate, curved plate, channel plate, channel steel, and rectangular tube.

[0021] Preferably, it also includes a connecting plate;

[0022] The bottom beam web is provided with multiple bolt holes;

[0023] The connecting plate has multiple bolt holes; the upper part is bolted to the web of the bottom beam, and the lower part is bolted to the chassis beam of the construction machinery.

[0024] Preferably, the subframe bottom beam is welded or riveted to the subframe body.

[0025] Preferably, the base plate of the subframe body is welded from straight or curved plates of different thicknesses.

[0026] An engineering machine, including the aforementioned subframe.

[0027] The beneficial effects of this invention are:

[0028] Based on the existing subframe body, this invention adds a subframe bottom beam as a transition component between the subframe body and the chassis beam of the construction machinery. This solves the problems of difficult overall space layout of the general chassis crane, limited cross-sectional width of the subframe body, and limited flatness of the subframe body bottom plate caused by direct connection between the subframe body and the general chassis. It allows the subframe body to make full use of thin and thick plates or bent plates in its design, with a reasonable design weight, meeting the weight and lifting performance requirements of the general chassis crane, while improving the versatility of the connection method between the subframe body and the general chassis. Attached Figure Description

[0029] Figure 1(a) is a schematic diagram of the subframe and chassis beam in the prior art;

[0030] Figure 1(b) is a schematic diagram of the connection between the subframe and the chassis beam in the prior art;

[0031] Figure 2(a) is a schematic diagram of a connector in the prior art;

[0032] Figure 2(b) is a cross-sectional view of a connector in the prior art;

[0033] Figure 3 Exploded view of the subframe provided for this invention;

[0034] Figure 4 Left view of the subframe provided by the present invention;

[0035] Figure 5 A schematic diagram of the subframe bottom beam provided by the present invention;

[0036] Figure 6 A schematic diagram of the base plate of the subframe body provided by the present invention;

[0037] Figure 7 This is a schematic diagram of the installation of the connecting plate provided by the present invention;

[0038] Figure 8 A schematic diagram of the connecting plate provided by the present invention;

[0039] Wherein, 1' is the vehicle frame; 2' is the chassis beam; 3' is the connecting part; 31' is the upper connecting part; and 32' is the lower connecting part.

[0040] 4 represents the main body of the subframe; 41 represents the first base plate; 42 represents the second base plate;

[0041] 5 is the subframe bottom beam; 51 is the bottom beam bottom plate; 52 is the transverse diaphragm; 53 is the longitudinal diaphragm; 54 is the bottom beam web plate; 55 is the bottom beam end plate; 56 is the weight reduction hole; 57 is the deformation area;

[0042] 6 is the hinge point; 7 is the connecting plate. Detailed Implementation

[0043] The present invention will be further described below with reference to the embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0047] Example 1

[0048] This embodiment provides a subframe, see [link / reference] Figure 3 and Figure 4 The system includes a subframe body 4 and a subframe bottom beam 5. The lower end face of the subframe bottom beam 5 matches the chassis beam of the construction machinery located below. When the upper end face of the chassis beam is horizontal, the lower end face of the subframe bottom beam 5 is on the same horizontal plane. The subframe bottom beam 5 is connected to the chassis beam of the construction machinery located below. The upper shape of the subframe bottom beam 5 matches the shape of the lower end face of the subframe body 4. The subframe bottom beam 5 is connected to the subframe body 4 located above. The width of the subframe bottom beam 5 is smaller than the width of the subframe body 4.

[0049] The subframe body 4 consists of four hinge points 6 and a central box-shaped section, serving as the primary load-bearing box structure. Based on the existing subframe body 4, this invention adds a subframe bottom beam 5 as a transition component between the subframe body 4 and the chassis beam of the construction machinery. The width of the subframe bottom beam 5 is smaller than that of the subframe body 4, forming a downwardly protruding frame structure. The width and connecting surface of the subframe bottom beam 5 can be designed according to the general chassis beam structure. Preferably, the width of the subframe bottom beam 5 is smaller than the width of the chassis beam, and the height of the subframe bottom beam 5 meets the layout requirements of the subframe body 4 without causing interference between the subframe body 4 and the general chassis tires or accessories on the general chassis beam. Furthermore, due to the narrower width and simpler form of the subframe bottom beam 5, installing the subframe bottom beam 5 is more convenient than installing the subframe body 4 directly on the chassis beam. At this point, the base plate of the main load-bearing structure, the subframe body 4, can be made by splicing thin and thick plates to reduce structural weight, or by choosing to splice bent plates, greatly enhancing the design freedom of the base plate of the subframe body 4. Simultaneously, since the subframe body 4 and the subframe bottom beam 5 form a downwardly protruding frame structure, interference between the subframe body 4 and the universal chassis tires and accessories on the universal chassis beams can be avoided. The width of the subframe body 4 is no longer limited by the width of the universal chassis beams, increasing the overall design freedom of the subframe body 4. This better meets the overall weight and lifting performance requirements of the universal chassis crane, while also improving the versatility of the connection method between the subframe and the universal chassis, and enhancing the ease of layout and installation.

[0050] Optionally, the subframe bottom beam 5 is made of steel and is welded from multiple straight plates.

[0051] Optional, see Figure 5The subframe bottom beam 5 includes two bottom beam plates 51, multiple transverse diaphragms 52, multiple longitudinal diaphragms 53, two bottom beam webs 54, and multiple bottom beam end plates 55. The bottom beam webs 54 are arranged along the length of the chassis beam of the construction machinery. The two bottom beam webs 54 are parallel to each other, and their two ends are welded to the bottom beam end plates 55, while their lower ends are welded to the bottom beam bottom plates 51. The transverse diaphragms 52 are spaced apart, parallel to each other, and their two ends are welded to the two bottom beam webs 54 respectively. They are perpendicular to the bottom beam webs 54, and their lower ends are welded to the bottom beam bottom plates 51. The multiple longitudinal diaphragms 53 are parallel to the bottom beam webs 54 and located between the two bottom beam webs 54. Their lower ends are welded to the bottom beam bottom plates 51. The multiple longitudinal diaphragms 53 are spaced apart, with one side welded to the transverse diaphragms 52 and the other side welded to the bottom beam end plates 55 or the transverse diaphragms 52. The lower end of the bottom beam end plates 55 is welded to the bottom beam bottom plates 51. The two bottom beam base plates 51 are located on the same horizontal plane. The heights of the transverse diaphragm 52, longitudinal diaphragm 53, bottom beam web plate 54, and bottom beam sealing plate 55 are determined according to requirements to ensure that the upper surface of the subframe bottom beam 5 matches the lower end surface of the subframe body 4 and that the subframe bottom beam 5 and the subframe body 4 are seamlessly connected.

[0052] Optional, see Figure 5 Weight reduction holes 56 are provided on the transverse diaphragm 52, longitudinal diaphragm 53, and bottom beam sealing plate 55.

[0053] Optionally, the lower end face of the subframe bottom beam 5 and the subframe body 4 form a box-shaped structure.

[0054] Optionally, the subframe bottom beam 5 is welded from one or more of the following: straight plate, curved plate, channel plate, channel steel, and rectangular tube.

[0055] Optionally, the cross-section of the subframe bottom beam 5 is rectangular, trapezoidal, or drum-shaped with the upper and lower ends parallel.

[0056] Optionally, the subframe bottom beam 5 is welded or riveted to the subframe body 4.

[0057] Optionally, since the present invention adds a subframe bottom beam 5, the restriction that the bottom plate of the subframe body 4 must be on the same horizontal plane is removed. Therefore, the bottom plate of the subframe body 4 can be welded from straight or curved plates of different thicknesses according to actual needs. Taking the subframe body shown in patent CN217921192U as an example, its bottom plate is as follows: Figure 6 As shown, it includes one first base plate 41 and four second base plates 42, with the four second base plates 42 forming the base plate at hinge point 6. Considering load distribution and minimizing weight while meeting strength requirements, it is preferable that the second base plates 42 be made of thicker steel plates, and the first base plate 41 be made of thinner steel plates. Meanwhile, as... Figure 5 The subframe bottom beam 5 is provided with multiple deformation areas 57 along the length of the subframe, which match the shape of the bottom plate of the subframe body 4, so that the upper end face of the subframe bottom beam 5 is connected and fastened to the subframe body 4.

[0058] Optional, see Figure 7 The bottom beam web 54 has multiple bolt holes. The subframe also includes a connecting plate 7. The connecting plate 7 is made of high-strength steel plate. The connecting plate 7 has multiple bolt holes, and its upper part is bolted to the bottom beam web 54, while its lower part is bolted to the chassis main beam 2'.

[0059] Figures 2(a) and 2(b) are schematic diagrams of the connection between the frame 1' and the chassis beam 2' in the prior art via connector 3'. The chassis beam 2' has bolt holes. Connector 3' includes an upper connector 31' and a lower connector 32'; the upper connector 31' is welded to the frame 1', and the lower connector 32' is fixed to the chassis beam 2' by bolts. The upper connector 31' and the lower connector 32' are also fixed by bolts. Because the specifications of general-purpose chassis are not uniform, the positions of the bolt holes on the chassis beam 2' vary. Since the upper connector 31' is welded to the frame 1', assembly is difficult, increasing design and manufacturing costs.

[0060] In this application, the subframe bottom beam 5 does not participate in load-bearing, therefore, several bolt holes are provided on the bottom beam web 54, which avoids the impact on frame strength and aesthetics caused by drilling holes in the subframe main body 4. The connection structure of the connecting plate 7 and the bottom beam web 54 provided in this application can be matched with different universal chassis. Installation only requires selecting appropriate bolt holes on the bottom beam web 54, reducing design and manufacturing costs. Furthermore, this connection structure does not require welding, reducing installation difficulty and making operation simple and convenient. When the width of the subframe bottom beam 5 is equal to the width of the chassis main beam 2', it can be directly selected... Figure 7 The flat connecting plate 7 is shown. When the width of the subframe bottom beam 5 is less than the width of the chassis main beam 2', an optional... Figure 8 The cross-section shown is a polygonal connecting plate 7. Preferably, the width of the subframe bottom beam 5 is equal to the width of the chassis main beam 2'.

[0061] The subframe bottom beam provided in this embodiment can be used in engineering machinery such as cranes.

[0062] Example 2

[0063] This embodiment provides a piece of construction machinery, including the subframe described in Embodiment 1. The construction machinery can be a crane, or other construction machinery whose subframe width is limited by the width of a general-purpose chassis beam.

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A subframe, comprising a subframe body, characterized in that, It also includes the subframe bottom beam; The subframe bottom beam is connected to the chassis beam of the construction machinery located below; the upper shape of the subframe bottom beam matches the lower end face shape of the subframe body, the subframe bottom beam is connected to the subframe body located above, and the width of the subframe bottom beam is smaller than the width of the subframe body. The subframe bottom beam includes two bottom beam plates, multiple transverse diaphragms, multiple longitudinal diaphragms, two bottom beam web plates, and multiple bottom beam end plates; The web of the bottom beam is set along the length of the chassis beam of the engineering machinery. The two webs of the bottom beam are parallel to each other, and both ends are welded to the bottom beam end plate and the lower end is welded to the bottom beam bottom plate. The transverse diaphragms are spaced apart and parallel to each other. Both ends are welded to the web plates of the two bottom beams, perpendicular to the web plates of the bottom beams, and the lower ends are welded to the bottom plates of the bottom beams. The multiple longitudinal diaphragms are parallel to the web of the bottom beam and located between the two webs of the bottom beam. Their lower ends are welded to the bottom plate of the bottom beam. The multiple longitudinal diaphragms are spaced apart, with one side welded to the transverse diaphragm and the other side welded to the bottom beam end plate or transverse diaphragm. The lower end of the bottom beam sealing plate is welded to the bottom plate of the bottom beam. The two bottom beams are located on the same horizontal plane.

2. A subframe according to claim 1, characterized in that, The subframe bottom beam is welded from multiple straight plates.

3. A subframe according to claim 1, characterized in that, The transverse diaphragms, longitudinal diaphragms, and bottom beam sealing plates are provided with weight reduction holes.

4. A subframe according to claim 1, characterized in that, The subframe bottom beam and the lower end face of the subframe body form a box-shaped structure.

5. A subframe according to claim 1, characterized in that, The subframe bottom beam is welded from one or more of the following: straight plate, curved plate, channel plate, channel steel, and rectangular tube.

6. A subframe according to claim 1, characterized in that, It also includes a connecting plate (7); The bottom beam web (54) is provided with multiple bolt holes; The connecting plate (7) is provided with multiple bolt holes. The upper part is connected to the web plate (54) of the bottom beam by bolts, and the lower part is connected to the chassis beam of the engineering machinery by bolts.

7. A subframe according to claim 1, characterized in that, The subframe bottom beam is welded or riveted to the subframe main body.

8. A subframe according to claim 1, characterized in that, The base plate of the subframe body is welded from straight or curved plates of different thicknesses.

9. An engineering machinery, characterized in that, Includes the subframe as described in any one of claims 1-8.

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